Diagnosis of Coating Performance Issues and Selection of Resin Modification Routes

1. Introduction

When problems occur in a coating formulation, it is not enough to look only at the surface symptoms. Issues such as foaming, cratering, sagging, floating and flooding, and poor application appearance can often be improved by adjusting additives, pigments and fillers, solvents, the rheological system, or application conditions. However, if the problem is concentrated in the intrinsic properties of the coating film—such as hardness, flexibility, adhesion, water resistance, solvent resistance, weatherability, corrosion protection, and block resistance—routine formulation fine-tuning alone is often insufficient.

The key to selecting a resin modification route is to establish a clear sequence of judgment:

Problem manifestation → Structural cause → Modification route → Performance benefit → Potential risk → Application validation

This article focuses on how to determine whether resin modification is needed when typical performance issues arise during formulation development, and how to select an appropriate modification direction.

2. When Should Resin Modification Be Considered?

2.1 Issues that should first be checked from additives, pigments/fillers, or application conditions

The following issues should usually not be attributed to the resin structure at the outset. Formulation compatibility and application conditions should be checked first.

Problem manifestation	Priority inspection direction
Excessive foam, slow defoaming	Type of defoamer, addition sequence, mixing intensity, application method
Cratering, fish eyes	Substrate contamination, wetting agent, leveling agent, differences in surface tension within the system
Sagging	Rheology modifier, application viscosity, wet film thickness, spraying parameters
Orange peel	Solvent evaporation rate, leveling time, spraying pressure, application viscosity
Floating and flooding	Dispersant, wetting agent, pigment/filler compatibility, grinding fineness
Settling and re-agglomeration	Dispersion stability, pigment/filler density, rheological system
Poor surface feel	Wax powder, slip additive, matting powder, surface additives

These issues may be related to resin compatibility, but they generally need to be investigated first from the perspectives of formulation composition, paint-making process, and application conditions. If the requirements still cannot be met after routine adjustments, it is then necessary to further examine whether there are fundamental limitations in the resin structure.

2.2 Issues that require returning to the resin structure

If the coating problem has the following characteristics, resin modification should be considered as a key focus.

Judgment condition	Description
Insufficient intrinsic coating-film performance	Hardness, flexibility, water resistance, solvent resistance, weatherability, corrosion protection, and other properties remain below requirements over the long term
Strong trade-offs between properties	Increasing hardness causes brittleness; increasing flexibility reduces block resistance; increasing crosslinking reduces adhesion
Limited effect from additive adjustment	Additives can only improve surface symptoms and cannot enhance long-term durability
Existing resin performance is close to its limit	After continued formulation adjustment, improvement in key properties remains limited
Application requirements increase	Transition from ordinary decorative coatings to industrial protection, outdoor weatherable systems, heavy-duty corrosion protection, low-VOC systems, or fast-curing systems
Coating-film failure shows structural characteristics	Cracking, whitening, water absorption, chalking, salt-spray failure, poor intercoat adhesion, and similar problems recur repeatedly

3. Inferring Structural Causes from Problem Manifestations

The core of selecting a resin modification route is to infer structural causes from coating-film problems. Although different problems may appear similar on the surface, they may arise from different structural factors. For example, coating-film cracking may result from an excessively high glass transition temperature, Tg, or it may result from excessive crosslink density, excessive internal stress, insufficient substrate adhesion, or excessive film thickness. If the structural cause is not identified, directly modifying the resin may introduce new problems.

Problem manifestation	Possible structural causes	Structural level to prioritize
Coating film is too brittle; poor impact resistance	High Tg, high hard-segment content, high crosslink density, restricted segmental mobility	Molecular chain structure, phase structure, crosslinked network
Insufficient hardness; poor scratch resistance	Low Tg, high soft-segment content, insufficient crosslinking, low surface hardness	Molecular chain structure, crosslinked network, surface structure
Insufficient flexibility	Molecular chains are too rigid, crosslinked network is too dense, insufficient soft phase	Molecular chain structure, phase structure, crosslinked network
Poor water resistance; whitening after water absorption	Excessive hydrophilic groups, insufficient crosslinking, incomplete film formation, high coating-film porosity	Functional groups, crosslinked network, phase structure
Poor adhesion	Insufficient polarity, weak interfacial interaction, high internal stress, insufficient substrate wetting	Functional groups, interfacial structure, crosslinked network
Poor solvent resistance	Weak intermolecular interactions, low crosslink density, loose network structure	Functional groups, crosslinked network
Poor weatherability; chalking and gloss loss	Insufficient backbone stability, surface prone to aging, insufficient resistance to UV degradation	Molecular chain structure, functional structure
Insufficient corrosion protection	High water absorption, poor barrier properties, insufficient substrate adhesion, many coating-film defects	Functional groups, crosslinked network, hybrid structure
Poor block resistance	Low surface Tg, insufficient crosslinking, enrichment of soft phase at the surface	Phase structure, crosslinked network, surface structure
Poor low-temperature film formation	High Tg, high minimum film-forming temperature, difficult particle coalescence	Molecular chain structure, phase structure
Excessively high viscosity; difficult application	High molecular weight, strong entanglement of linear chains, limited increase in solids content	Molecular chain structure, branched structure

Minimum film-forming temperature, MFFT, is an important indicator of the film-forming ability of dispersion-type resins. For emulsions or waterborne dispersions, whether resin particles can coalesce into a continuous coating film at the application temperature directly affects adhesion, water resistance, and mechanical properties.

4. Selection of Resin Modification Routes for Common Performance Issues

The resin modification route should be centered on the main performance issue. The table below integrates common performance issues, structural causes, priority modification routes, main benefits, and points requiring caution, making it easier to make quick judgments during formulation development.

Performance issue	Main structural causes	Priority modification routes	Main benefits	Points requiring caution
Coating film is too brittle; poor impact resistance	High Tg, high hard-segment content, high crosslink density, high internal stress	Flexible segment modification, core-shell toughening, interpenetrating polymer network, IPN, reduction of crosslink density	Improves flexibility, impact resistance, and bending performance	Hardness, heat resistance, and solvent resistance may decrease
Insufficient hardness; poor scratch resistance	Low Tg, high soft-segment content, insufficient crosslinking, low surface hardness	Rigid segments, high-Tg structures, crosslinking modification, nano-reinforcement	Improves hardness, block resistance, and wear resistance	Flexibility, impact resistance, and adhesion may decrease
Insufficient flexibility	Restricted segmental mobility, overly dense network, insufficient soft phase	Flexible segments, polyurethane segments, core-shell structure, soft-hard phase synergy	Improves bending, impact resistance, and low-temperature performance	Surface hardness, heat resistance, and block resistance may decrease
Poor water resistance; whitening after water absorption	Excessive hydrophilic groups, insufficient crosslinking, incomplete film formation, high coating-film porosity	Hydrophobic modification, post-crosslinking, silane modification, phase-structure optimization	Improves water resistance, wet adhesion, and coating-film compactness	Dispersion stability, application wetting, and low-temperature film formation need validation
Poor adhesion	Insufficient polarity, insufficient reactive sites, weak interfacial interaction, high internal stress	Modification with epoxy, hydroxyl, carboxyl, silane, or phosphate ester groups	Improves dry adhesion, wet adhesion, and bonding to the substrate	Water absorption, curing shrinkage, and corrosion resistance need to be balanced
Poor solvent resistance	Insufficient crosslinking, loose network, resin prone to swelling	Increased functionality, crosslinked-network modification, two-component curing	Improves solvent resistance, chemical resistance, and hardness	Risk of increased brittleness, internal stress, and limited pot life/application time
Poor weatherability; chalking and gloss loss	Insufficient backbone stability, surface prone to aging, weak resistance to UV degradation	Acrylation, silicone modification, fluorine modification, introduction of stable chain segments	Improves gloss retention, color retention, aging resistance, and surface stability	Cost, compatibility, recoatability, and intercoat adhesion need validation
Insufficient corrosion protection	High water absorption, poor barrier properties, weak metal adhesion, many coating-film defects	Epoxy structures, phosphate ester groups, siloxane hybridization, nano-lamellar reinforcement	Improves adhesion, barrier properties, salt-spray resistance, and damp-heat stability	Dispersion, brittleness, coating-film defects, and long-term water absorption must be controlled
Poor block resistance	Low surface Tg, insufficient crosslinking, enrichment of soft phase at the surface	High-Tg shell layer, post-crosslinking, hard-segment introduction, surface-structure adjustment	Improves surface hardness, block resistance, and wear resistance	Low-temperature film formation, flexibility, and early water resistance may deteriorate
Poor low-temperature film formation	High Tg, high MFFT, difficult particle coalescence	Core-shell structure, gradient structure, soft-hard phase design	Improves low-temperature film formation, early adhesion, and coating-film continuity	Block resistance, hardness, and early water resistance need simultaneous validation
Poor application properties after VOC reduction	High viscosity, strong molecular-chain entanglement, high curing shrinkage, short open time	Branched structure, hyperbranched structure, low-viscosity high-solids resin, control of reactivity	Reduces viscosity and improves solids content, leveling, and application adaptability	Curing shrinkage, adhesion, flexibility, and storage stability need validation

Most practical problems are not caused by a single factor. For example, insufficient corrosion protection usually involves water absorption, adhesion, barrier properties, and coating-film defects at the same time. Poor water resistance may also result simultaneously from excessive hydrophilic groups, insufficient crosslinking, and incomplete film formation. Therefore, the modification routes listed in the table should be evaluated comprehensively together with test results, substrate type, application conditions, and service environment.

5. Key Checks in Modification Route Selection

5.1 Check performance benefits and potential trade-offs

Resin modification is a process of rebalancing performance, not a one-way enhancement. The modification route should be evaluated in terms of both the benefits and the properties that may be sacrificed.

Modification direction	Main benefits	Potential trade-offs
Increasing Tg or introducing rigid chain segments	Improves hardness, block resistance, and heat resistance	Reduces flexibility, impact resistance, and low-temperature film formation
Introducing flexible chain segments	Improves flexibility, impact resistance, and low-temperature performance	Hardness, heat resistance, and solvent resistance may decrease
Increasing polar functional groups	Improves adhesion and reactivity	Water absorption may increase; water resistance and salt-spray resistance may decrease
Increasing crosslink density	Appropriately improves solvent resistance, chemical resistance, hardness, and coating-film compactness	Excessive crosslinking may increase brittleness, internal stress, curing shrinkage, microcracking, and adhesion risks
Introducing silicone or fluorine structures	Improves stain resistance, hydrophobicity, and weatherability	Recoatability, intercoat adhesion, and compatibility need validation
Nano-reinforcement	Improves wear resistance, corrosion protection, and barrier properties	Difficult dispersion, increased viscosity, and higher risk of coating-film defects
Core-shell or gradient structure	Makes it easier to balance film formation, hardness, and block resistance	Higher requirements for particle structure and production control
Branched or hyperbranched structure	Reduces viscosity and improves solids content and reactive-site density	Curing shrinkage, brittleness, and storage stability need to be controlled
Self-crosslinking structure	Improves properties after film formation and is relatively convenient for application	Storage stability and degree of post-crosslinking need to be balanced

5.2 Check whether validation indicators are complete

The effect of resin modification cannot be judged using a single indicator. Different objectives should be matched with different test items, while both initial performance and long-term performance should be considered.

Modification objective	Recommended key evaluation indicators
Improve hardness	Pencil hardness, pendulum hardness, wear resistance, scratch resistance, block resistance
Improve flexibility	Bending, impact resistance, tensile properties, thermal cycling, cracking observation
Improve water resistance	Water immersion, boiling-water resistance, water absorption, wet adhesion, salt-spray resistance
Improve adhesion	Cross-cut adhesion, pull-off adhesion, wet adhesion, intercoat adhesion
Improve solvent resistance	MEK, methyl ethyl ketone, double rubs; solvent immersion; mass change; hardness retention
Improve weatherability	UV aging, xenon-lamp aging, outdoor exposure, gloss retention, color difference
Improve corrosion protection	Salt spray, damp heat, cyclic corrosion, electrochemical impedance spectroscopy, EIS, scribe creep
Reduce VOC	Solids content, viscosity, leveling, open time, drying speed, curing speed, final coating-film performance
Improve low-temperature film formation	MFFT, low-temperature application, early water resistance, appearance, adhesion

Some modifications perform well in initial testing but may fail after long-term water immersion, damp heat exposure, UV aging, or thermal cycling. Therefore, validation of resin modification should cover performance changes during the early film-forming stage, after complete curing, and under simulated service conditions.

6. Typical Application Judgment Cases

The following cases illustrate how to select a resin modification route starting from the problem.

6.1 Case 1: Hardness is sufficient, but the coating film is too brittle

6.1.1 Problem manifestation

The coating film meets pencil hardness and solvent resistance requirements, but cracking occurs after impact, bending, or thermal cycling. Cracking is more obvious in thick-film applications, and adhesion also decreases in some systems.

6.1.2 Structural judgment

Possible structural cause	Judgment focus
Tg is too high	Segmental mobility is insufficient, making cracking more likely under low temperature or impact
Crosslink density is too high	The network is too dense, reducing deformability
Hard-segment content is too high	The coating film is highly rigid and lacks sufficient energy dissipation capacity
High curing shrinkage	Internal stress becomes concentrated, reducing adhesion and crack resistance
Lack of toughening structure	Impact energy cannot be effectively dissipated

6.1.3 Modification routes

Modification route	Function
Introduce flexible chain segments	Improves segmental mobility and low-temperature flexibility
Reduce crosslink density or introduce flexible spacer chains	Reduces brittleness and internal stress
Adopt core-shell toughening or a soft-hard phase structure	Absorbs impact energy through the soft phase
Adopt an IPN structure	Improves toughness while maintaining strength
Adjust curing speed	Reduces accumulation of internal stress during curing

6.1.4 Validation focus

Hardness, solvent resistance, adhesion, bending, impact resistance, heat resistance, and block resistance must be validated simultaneously to prevent excessive decreases in hardness and medium resistance after toughening.

6.2 Case 2: Poor water resistance, whitening or adhesion loss after water immersion

6.2.1 Problem manifestation

The coating film turns white, blisters, or loses gloss after water immersion. It partially recovers after drying, but wet adhesion decreases. In some systems, blistering or scribe creep occurs during salt-spray testing.

6.2.2 Structural judgment

Possible structural cause	Judgment focus
Excessive hydrophilic groups	Water can easily enter the coating film, causing whitening and a decrease in wet-state strength
Incomplete film formation	Insufficient particle coalescence forms micropores or water pathways
Insufficient crosslinking	Coating-film compactness and wet-state strength are insufficient
Residual migratable hydrophilic components	These form water-absorbing sites or interfacial defects
Weak interfacial bonding	Water entering the interface reduces adhesion

6.2.3 Modification routes

Modification route	Function
Reduce excessive hydrophilic groups	Reduces water-absorbing sites
Introduce hydrophobic chain segments	Reduces water permeation and coating-film water absorption
Introduce post-crosslinking or self-crosslinking structures	Improves coating-film compactness and wet-state strength after film formation
Adopt silane modification	Improves water resistance and adhesion to inorganic substrates
Optimize core-shell or gradient structures	Balances film-forming ability and water resistance

6.2.4 Validation focus

Storage stability, application wetting, early water resistance, long-term water immersion, wet adhesion, salt-spray resistance, and damp-heat performance must be validated simultaneously. After hydrophobicity is enhanced, particular attention should be paid to system stability and substrate wetting.

6.3 Case 3: Both corrosion protection and weatherability need to be improved

6.3.1 Problem manifestation

A single corrosion-protection system may have good adhesion and salt-spray performance but insufficient outdoor weatherability. A conventional weatherable topcoat may have good gloss retention but insufficient protection for metal substrates. In actual applications, the coating system is required to provide adhesion, corrosion protection, water resistance, weatherability, and chemical resistance at the same time.

6.3.2 Structural judgment

Possible structural cause	Judgment focus
Insufficient functionality of a single resin	It is difficult to meet both metal corrosion-protection and outdoor weatherability requirements
Coating-film water absorption is too high	Barrier performance decreases, allowing corrosive media to enter the coating
Chalking after outdoor aging	The protective ability of the coating decreases with aging
Insufficient interfacial adhesion	Corrosive media enter the metal interface
Coating film is too brittle	Cracks form under thermal cycling and mechanical stress

6.3.3 Modification routes

Modification route	Function
Introduce epoxy structures	Improves metal adhesion, chemical resistance, and basic corrosion-protection performance
Introduce siloxane structures	Improves water resistance, weatherability, and chemical resistance
Introduce acrylic or polyurethane segments	Improves outdoor gloss retention, flexibility, and wear resistance
Introduce nano-lamellar structures	Extends the diffusion path of water, oxygen, and ions
Control crosslink density	Prevents microcracks caused by brittleness in high-barrier coating films

6.3.4 Validation focus

Dry adhesion, wet adhesion, salt-spray resistance, cyclic corrosion resistance, UV aging resistance, bending performance, impact resistance, and intercoat adhesion must be validated simultaneously. For silicone-containing, fluorine-containing, or low-surface-energy structures, recoatability and intercoat bonding should also be carefully evaluated..

7. Basic Principles for Selecting Resin Modification Routes

7.1 First determine the source of the problem; do not attribute all issues to the resin

For leveling, defoaming, wetting, dispersion, application appearance, and similar issues, additives, pigments and fillers, solvent systems, application conditions, and substrate pretreatment should be checked first. Long-term performance issues such as hardness, flexibility, water resistance, weatherability, corrosion protection, solvent resistance, and wet adhesion require greater attention to the resin structure.

7.2 First identify the main performance conflict, then select the modification direction

Resin modification should not attempt to solve all problems at once. The main conflict should first be identified, and then the corresponding modification direction should be selected.

Main conflict	Priority direction
Difficulty balancing hardness and flexibility	Molecular chain structure, phase structure, crosslink density
Difficulty balancing water resistance and system stability	Functional groups, hydrophobic structure, post-crosslinking
Difficulty balancing chemical resistance and impact resistance	Crosslinked network, flexible spacer structure
Difficulty balancing weatherability and recoatability	Surface structure, control of low-surface-energy structures
Difficulty balancing corrosion protection and cracking risk	Balance among adhesion, barrier properties, water absorption, and flexibility
Difficulty balancing low VOC and application properties	Molecular weight, branched structure, reactivity

7.3 Start from the structural cause

The same performance issue can be solved through different resin modification routes, and different resins may correspond to similar structural effects. When selecting a modification route, priority should be given to determining whether the problem comes from chain-segment rigidity, functional groups, phase structure, crosslink density, water absorption, or interfacial interactions, rather than simply deciding “which resin should be replaced.”

7.4 Evaluate both performance benefits and potential trade-offs

Increasing hardness may sacrifice flexibility. Increasing crosslink density may improve solvent resistance but also increase brittleness and internal stress. Introducing polar groups may improve adhesion but increase water absorption. Introducing silicone or fluorine structures may improve stain resistance and weatherability but affect recoatability and intercoat adhesion. The key to resin modification is not maximizing a single property, but achieving acceptable overall performance in the target application.

7.5 Final validation must return to application conditions

A reasonable resin-structure design does not mean that the actual coating will necessarily be successful. Final coating performance is also affected by pigments and fillers, additives, curing agents, application conditions, substrate pretreatment, film thickness, and service environment. After the resin modification route is determined, the following should be validated in sequence:

① Basic resin indicators: solids content, viscosity, acid value, hydroxyl value, epoxy value, particle size, Tg, and MFFT for emulsion or waterborne dispersion systems.

② Coating application indicators: application viscosity, leveling, open time, drying speed, and storage stability.

③ Basic coating-film properties: hardness, adhesion, flexibility, impact resistance, wear resistance, and block resistance.

④ Durability properties: water resistance, solvent resistance, chemical resistance, salt-spray resistance, damp-heat resistance, and aging resistance.

⑤ Application validation: target substrate, target film thickness, target application process, and actual service environment.

The true value of resin modification is to bring coating performance closer to the requirements of real applications. For formulation R&D personnel, the important task is to determine the structural causes from coating-film problems and select an appropriate modification route.

8. Representative Chemicals Related to Coating Performance Issues, Resin Modification, and Formulation Validation

Note: The following products are provided only as representative chemical references for resin modification, formulation design, and performance validation. Actual use should be evaluated together with the SDS, regulatory restrictions, free monomer content, application exposure, storage stability, and target application validation.

Table 1. Products Related to Hardness, Flexibility, and Chain-Segment Structure Control

Category	CAS No.	Aladdin Catalog No.	Name	Specification or Purity	Product Features and Applications
Surface slip and stain-resistance adjustment	63148-62-9	S433164	Silicone oil	Viscosity 5 cSt (25°C)	Used in studies on coating-film surface slip, hydrophobicity, and stain resistance; can be used together with low-surface-energy resin modification systems
Flexible chain-segment raw material	124-04-9	A108267	Adipic acid	Pharmaceutical grade, PharmPure™, ≥99.6%	Used in polyester, polyurethane, and flexible chain-segment design; can help improve coating-film flexibility, impact resistance, and low-temperature performance
Flexible polyether segment	25190-06-1	P432410	Polytetrahydrofuran, PTHF	Average Mn ~2900	Used in polyurethane soft segments, elastomeric resins, and toughening modification research; can improve coating-film flexibility and low-temperature crack resistance
Flexible dibasic acid	111-20-6	S108452	Sebacic acid	Chemically pure, CP, ≥98%	Used in polyester resins, alkyd resins, and flexible chain-segment modification; can adjust coating-film flexibility, impact resistance, and low-temperature resistance
Hard monomer	100-42-5	S110375	Styrene	CP, contains 10–15 ppm 4-tert-butylcatechol stabilizer	Used in styrene-acrylic copolymerization, hard-segment structures, and block-resistant resin design; can improve coating-film hardness and rigidity
Hard monomer	80-62-6	M109623	Methyl methacrylate, MMA	AR, ≥99%, contains 30 ppm DMBP stabilizer	Used in acrylic copolymerization, hard-segment control, and weatherable resin design; can be used to improve coating-film hardness and gloss retention
Rigid hydrophobic monomer	7534-94-3	I102358	Isobornyl methacrylate	50–150 ppm MEHQ stabilizer	Used in rigid chain segments, low-viscosity reactive systems, and water-resistant resin research; can adjust hardness, heat resistance, and hydrophobicity
Hydrophobic monomer	97-88-1	B110902	Butyl methacrylate, BMA	≥99%, contains MEHQ stabilizer	Used in acrylic copolymers, hydrophobic chain segments, and soft-hard balanced resin design; can adjust film formation, water resistance, and flexibility
Soft monomer	141-32-2	B100035	Butyl acrylate, BA	≥99%, stabilized with 10–60 ppm MEHQ	Used for soft-segment copolymerization, low-temperature film formation, and flexibility adjustment; a commonly used raw material in soft-hard monomer balance design
Soft monomer	103-11-7	E108592	2-Ethylhexyl acrylate, 2-EHA	≥99% (GC), contains 10–1100 ppm MEHQ as stabilizer	Used in low-glass-transition-temperature copolymers, flexible chain segments, and toughened resin research

Table 2. Products Related to Adhesion, Water Resistance, and Functional-Group Modification

Category	CAS No.	Aladdin Catalog No.	Name	Specification or Purity	Product Features and Applications
Hydroxyl-functional monomer	868-77-9	H140643	2-Hydroxyethyl methacrylate, HEMA	Anhydrous grade, ≥99%, contains 200 ppm MEHQ stabilizer, water ≤0.1%	Used in hydroxyl acrylic resins, reactive copolymers, and post-crosslinkable resin design; can introduce hydroxyl reactive sites
Carboxyl-functional monomer	79-10-7	A397753	Acrylic acid	Anhydrous grade, ≥99%, contains 200 ppm MEHQ stabilizer	Used in acrylic copolymerization, water-dispersible resins, and adhesion modification research; can introduce carboxyl groups and adjust resin polarity
Carboxyl-functional monomer	79-41-4	M434201	Methacrylic acid	Suitable for synthesis, stabilized with hydroquinone monomethyl ether	Used in methacrylic copolymers, polar chain segments, and adhesion-promoting resin design
Organic-inorganic hybrid precursor	78-10-4	T110593	Tetraethyl orthosilicate	Reagent grade, ≥98%	Used in siloxane networks, sol-gel hybridization, and compact water-resistant coating research
Aminosilane surface-treatment agent	919-30-2	A107147	3-Aminopropyltriethoxysilane, APTS	≥99%	Can be used as an aminosilane surface-treatment reagent for inorganic surface modification, interfacial bonding, adhesion promotion, and coating/resin interface research
Phosphorylation modification raw material	7664-38-2	P112028	Phosphoric acid	≥99%, crystalline	Used in phosphate esterification reactions, metal surface treatment, and resin modification experiments related to metal adhesion
Hydrazide crosslinker	1071-93-8	A109760	Adipic dihydrazide, ADH	≥99% (HPLC)	Used for post-crosslinking of diacetone acrylamide copolymers, self-crosslinking emulsions, and room-temperature crosslinking systems
Carbonyl-crosslinking functional monomer	2873-97-4	D110099	Diacetone acrylamide, DAAM	≥99%	Used in self-crosslinking acrylic emulsions; works with hydrazide crosslinkers to build room-temperature crosslinked networks
Phosphate ester functional monomer	52628-03-2	H303891	2-Hydroxyethyl methacrylate phosphate	≥98%, contains 700–1000 ppm MEHQ, mixture	Used in metal adhesion modification, phosphate ester-functional acrylic resins, and anticorrosion interface research
Vinyl silane monomer	2768-02-7	V162969	Vinyltrimethoxysilane	≥98% (GC)	Used in silane grafting, water-resistant resin modification, and moisture-curing hybrid systems
Siloxane network precursor	1185-55-3	T106658	Methyltrimethoxysilane	≥98%	Used in hydrophobic siloxane networks, water-resistance modification, and organosilicone hybrid coatings
Epoxy-functional monomer	106-91-2	G106686	Glycidyl methacrylate	≥97%, contains 100 ppm MEHQ stabilizer	Used in epoxy-functionalized acrylic resins, grafting reactions, and adhesion-promoting copolymer design
Methacryloxy silane	2530-85-0	S111153	3-Methacryloxypropyltrimethoxysilane	≥97%, contains 100 ppm BHT stabilizer	Used in silane copolymerization of acrylic resins, inorganic surface grafting, and organic-inorganic interface modification
Epoxy silane coupling agent	2530-83-8	G107576	3-Glycidyloxypropyltrimethoxysilane	≥97%	Used in epoxy-functional silane modification, adhesion promotion on metal and inorganic substrates, and interfacial bonding in hybrid coatings
Acetoacetoxy functional monomer	21282-97-3	A107223	2-Acetoacetoxyethyl methacrylate, AAEM	≥94%, contains 300 ppm BHT stabilizer	Used in self-crosslinking emulsions, reactive carbonyl copolymers, and room-temperature post-crosslinking system design

Table 3. Products Related to Crosslinking Curing, Solvent Resistance, and Low-Volatility Curing

Category	CAS No.	Aladdin Catalog No.	Name	Specification or Purity	Product Features and Applications
Aliphatic diisocyanate	822-06-0	H106723	Hexamethylene diisocyanate, HDI	Moligand™, ≥99%	Used as a polyurethane raw material, in the synthesis of polyisocyanate curing agents, and in the design of weatherable polyurethane resins
Basic raw material for epoxy resin	1675-54-3	B131786	Bisphenol A diglycidyl ether, BADGE	Moligand™, ≥85%	Used in epoxy resins, anticorrosion coatings, epoxy-modified resins, and epoxy-amine curing systems
Cycloaliphatic diisocyanate	4098-71-9	I109582	Isophorone diisocyanate, mixture of isomers, IPDI	≥99%	Used in polyurethane modification, weatherable polyurethane resins, and two-component crosslinking systems
Cycloaliphatic diamine curing agent	2855-13-2	A104545	Isophorone diamine, cis/trans mixture, IPDA	≥99%	Used in epoxy curing, cycloaliphatic amine curing systems, and chemical-resistant coating research
Amino crosslinker	3089-11-0	T162539	2,4,6-Tris[bis(methoxymethyl)amino]-1,3,5-triazine	≥98% (HPLC)	Used in thermal curing of hydroxyl resins, amino baking enamel crosslinking, and chemical-resistant coating systems
Difunctional acrylate	42978-66-5	T162230	Tripropylene glycol diacrylate	≥90%, total of isomers, stabilized with MEHQ	Used as a photocurable reactive diluent, for crosslink density adjustment, and in flexible UV-curable systems
Difunctional acrylate	13048-33-4	H102721	1,6-Hexanediol diacrylate, HDDA	Contains MEHQ stabilizer, ≥90%	Used in UV-curable coatings, crosslinked network construction, and low-viscosity reactive diluent systems
Trifunctional acrylate	15625-89-5	T102522	Trimethylolpropane triacrylate	≥85%, contains 600 ppm MEHQ stabilizer	Used in high-crosslink-density UV-curable systems, hardness improvement, and fast-curing coating research

Table 4. Products Related to Weatherability, Stain Resistance, Light Stabilization, and Corrosion Inhibition

Category	CAS No.	Aladdin Catalog No.	Name	Specification or Purity	Product Features and Applications
Epoxidized vegetable oil	8013-07-8	E107074	Epoxidized soybean oil, ESO	Chemically pure, CP	Used in bio-based epoxidized vegetable oil modification, flexibility adjustment, reactive dilution, or toughening research; it is not equivalent to conventional bisphenol A-type epoxy anticorrosion resin
Fluorine-modified monomer	352-87-4	T299433	2,2,2-Trifluoroethyl methacrylate	PrimorTrace™ Ultra, electronic grade, ≥99.9999% metals basis	Used in fluorine-modified acrylic resins, low-surface-energy copolymers, and stain-resistant surface functionalization research
UV absorber	131-57-7	H109416	2-Hydroxy-4-methoxybenzophenone	≥99%	Used in coating light-stabilization research; can be used to improve the UV-aging resistance of resin systems
Copper corrosion inhibitor	95-14-7	B101002	Benzotriazole	≥99%	Used in metal corrosion inhibition, anticorrosion coatings, and metal interface protection research; commonly used in protective systems for copper and its alloys
Copper corrosion inhibitor	29385-43-1	M158120	Methyl-1H-benzotriazole, mixture, TTA	≥98% (GC)	Used in corrosion inhibition for copper and copper alloys, anticorrosion coatings, and metal interface protection experiments
UV absorber	25973-55-1	D155329	2-(3,5-Di-tert-amyl-2-hydroxyphenyl)benzotriazole	≥98%	Used in weatherable coatings, UV-aging-resistant systems, and outdoor resin stabilization research
Hindered amine light stabilizer	52829-07-9	B102211	Bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate	≥98%	Used in coating light stabilization, free-radical scavenging, and outdoor weatherable resin systems
Fluorine-modified monomer	36405-47-7	H100688	2,2,3,4,4,4-Hexafluorobutyl methacrylate, HFBMA	≥96%, contains MEHQ stabilizer	Used in fluorine-modified acrylic resins, hydrophobic stain-resistant coatings, and low-surface-energy surface copolymerization research

Table 5. Products Related to Anticorrosion Barrier Properties, Nano-Reinforcement, and Bio-Based Modification

Category	CAS No.	Aladdin Catalog No.	Name	Specification or Purity	Product Features and Applications
Bio-based unsaturated diacid	97-65-4	I106140	Itaconic acid	Chemically pure, CP, ≥99%	Used in bio-based polyester, acrylic copolymerization, and sustainable resin modification research
Layered inorganic material	1318-93-0	M758183	Montmorillonite K-10	Powder	Used in lamellar barrier systems, anticorrosion coatings, nanocomposite resins, and organic-inorganic hybrid research
Bio-based dibasic acid	110-15-6	S431422	Succinic acid	PharmPure™, ChP, JP, ACS, NF, crystalline	Used in bio-based polyester, alkyd resin, and low-carbon resin synthesis research
Anticorrosive pigment	13939-25-8	A302801	Aluminum tripolyphosphate	P₂O₅ content 60–70%	Used in anticorrosion coatings, metal primers, and phosphate-based corrosion-inhibition systems
Anticorrosive pigment	7779-90-0	Z112909	Zinc phosphate hydrate	AR, ≥99%	Used in metal anticorrosion coatings, anticorrosive primer systems, and phosphate corrosion-inhibition research
Anticorrosive pigment	13767-32-3	Z100955	Zinc molybdate	≥99.9% metals basis	Used in metal corrosion protection, corrosion-inhibiting pigment systems, and salt-spray-resistant coating research
Nano wear-resistant material	1344-28-1	A299044	Aluminum oxide	≥99.8% metals basis, 13 nm, TEM	Used in wear resistance, scratch resistance, hardness improvement, and inorganic-reinforced coating research
Nano inorganic reinforcement material	7631-86-9	S433693	Silicon dioxide	≥99.5% metals basis, nanopowder, 10–20 nm particle size, BET	Used in nano-reinforcement, wear and scratch resistance, transparent reinforcement, and organic-inorganic hybrid coatings
Carbon-based barrier material	1034343-98-0	G302113	High-purity graphene	≥99%	Used in nanocomposite coatings, anticorrosion barrier systems, conductive coatings, and resin reinforcement research
Bio-based diol	652-67-5	I157515	Isosorbide	≥98% (GC)	Used in bio-based polyester, polyurethane, and rigid chain-segment modification research; can adjust resin heat resistance and mechanical properties

Note: The products above are representative Aladdin products. For more product specifications, please search by “product name/CAS/catalog number” on the Aladdin website.

References

[1] Wicks Z. W., Jones F. N., Pappas S. P., Wicks D. A. Organic Coatings: Science and Technology, 3rd ed. Wiley-Interscience, 2007.

[2] Lambourne R., Strivens T. A. Paint and Surface Coatings: Theory and Practice, 2nd ed. Woodhead Publishing, 1999.

[3] Pieters K., Mekonnen T. H. Progress in waterborne polymer dispersions for coating applications: commercialized systems and new trends. RSC Sustainability, 2024.

[4] Keddie J. L., Routh A. F. Fundamentals of Latex Film Formation: Processes and Properties. Springer, 2010.

[5] Rajawasam C. W. H., Dodo O. J., Weerasinghe M. A. S. N., Raji I. O., Wanasinghe S. V., Konkolewicz D., De Alwis Watuthanthrige N. Educational series: characterizing crosslinked polymer networks. Polymer Chemistry, 2024, 15: 219–247.

[6] Pathania A., Arya R. K., Ahuja S. Crosslinked polymeric coatings: Preparation, characterization, and diffusion studies. Progress in Organic Coatings, 2017, 105: 149–162.

[7] Montemor M. F. Functional and smart coatings for corrosion protection: a review of recent advances. Surface and Coatings Technology, 2014, 258: 17–37.

[8] Figueira R. B., Silva C. J. R., Pereira E. V. Hybrid sol–gel coatings for corrosion mitigation: a critical review. Polymers, 2020, 12(3): 689.

[9] Ghosh S. K. UV and EB Curing Technology and Equipment. Wiley, 1998.

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