Waterborne Resin Technology Explained: Waterborne Forms, Performance Balance, and a Technology Map

1 Waterborne resin is not simply “replacing solvent with water”

1.1 What is a waterborne resin?

A waterborne resin is a film-forming resin system that uses water as the primary dispersion medium or dilution medium. It can be used in architectural coatings, wood coatings, industrial coatings, anticorrosive coatings, flooring coatings, packaging coatings, inks, adhesives, and other fields.

Waterborne resin is not the same as water-soluble resin. Many waterborne resins are not systems in which resin molecules are completely dissolved in water. Instead, through emulsification, dispersion, hydrophilic modification, neutralization into salts, or protective colloids, the resin is stably present in water in the form of polymer particles, colloidal particles, or resin microparticles. When understanding waterborne resins, two questions need to be distinguished:

Question	Meaning
Whether water is used as the main medium	Water is the main dispersion medium or dilution medium of the resin system
Whether the resin is truly soluble in water	Whether resin molecules or polymer segments can form a relatively homogeneous system in water

Common acrylic emulsions, styrene-acrylic emulsions, vinyl acetate-ethylene copolymer emulsions VAE, polyurethane dispersions PUD, and waterborne epoxy dispersions are usually not simple “aqueous resin solutions,” but waterborne dispersion systems.

1.2 The technical essence of waterborne conversion

The key to making a resin waterborne is not to directly put a solventborne resin into water, but to solve two fundamental problems:

① During application and storage, how the resin can remain stable in water.

② After film formation, how the resin can form a dry film with the target properties.

These two questions determine the basic characteristics of waterborne resin technology.

In solventborne coatings, the resin is usually dissolved or highly dispersed in an organic solvent, and a coating film is formed as the solvent evaporates after application. In waterborne coatings, the resin often exists as emulsion particles, dispersion microparticles, or a water-reducible system. After application, the system must undergo water evaporation, resin particles moving closer together, film formation, and the establishment of final properties.

The technical focus of waterborne resins is not only “low VOC (Volatile Organic Compounds),” but also includes dispersion stability in water, application adaptability, film-forming integrity, dry-film water resistance, compatibility with additives, pigments, fillers, and substrates, and final application performance.

VOC reduction is an important driving force for the development of waterborne resins, but a waterborne system does not mean it is absolutely free of volatile substances. Some waterborne coatings may still contain coalescing agents, co-solvents, pH regulators, preservatives, and other components. When evaluating a waterborne system, the complete formulation, application conditions, and regulatory requirements should be considered comprehensively.

1.3 The development value of waterborne resins

The growth in the application of waterborne resins mainly comes from three aspects: environmental requirements, application requirements, and application upgrading.

Driving factor	Main manifestation
Environmental and regulatory requirements	Reducing VOC emissions and reducing the use of highly volatile organic solvents
Application and safety requirements	Usually reducing odor and overall flammability risk, and allowing cleaning with water
Application upgrading requirements	Achieving a balance among low odor, low emissions, and high performance in architectural, wood, industrial, anticorrosive, packaging, and other fields

2 Main waterborne forms of waterborne resins

The first technical question for waterborne resins is: in what form does the resin exist in water? Different forms determine the storage stability, application method, film-forming characteristics, water resistance, and suitable application range of the resin. Common waterborne forms include water-soluble systems, water-reducible systems, emulsion systems, waterborne dispersions, and hybrid systems. Emulsion systems also belong to the broader category of waterborne dispersions; they are listed separately here to highlight their particle dispersion and coalescence-based film-forming characteristics.

Form	Existing state	Typical systems	Main advantages	Key points of concern
Water-soluble type	Resin segments have strong interactions with water and can form a relatively homogeneous system	Water-soluble acrylics, polyvinyl alcohol PVA, etc.	Good transparency and processability	When hydrophilicity is strong, dry-film water resistance needs attention
Water-reducible type	After neutralization, co-solvent assistance, or hydrophilic modification, the resin can be diluted with water	Waterborne alkyds, waterborne polyesters, waterborne amino baking systems, etc.	Good wetting, leveling, and fullness	pH, co-solvents, VOC, storage stability
Emulsion type	Polymer particles are dispersed in water, with water as the continuous phase	Styrene-acrylic emulsions, pure acrylic emulsions, silicone-acrylic emulsions, VAE emulsions	Relatively high solids content, broad application, and low VOC potential	Particle size, minimum film formation temperature MFFT, freeze-thaw stability, mechanical stability
Waterborne dispersion	Resin microparticles or colloidal particles are stably dispersed in water	Polyurethane dispersion PUD, waterborne epoxy dispersion, waterborne polyester dispersion	Higher performance requirements can be met through structural design, functional groups, and crosslinking design	pH, particle size, additive compatibility, functional groups, and crosslinking capability
Hybrid system	Two or more resin structures are combined to form a waterborne system	Polyurethane-acrylic hybrids, epoxy-acrylic hybrids, alkyd-acrylic hybrids	Helps balance properties that are difficult for a single resin to achieve at the same time	Resin compatibility, stability, cost, and performance balance

2.1 Water-soluble resins

Water-soluble resins usually contain relatively many hydrophilic groups, such as carboxyl groups, hydroxyl groups, sulfonate groups, and amine salts, allowing the resin segments to interact strongly with water. The advantages of this type of system are good processability and transparency. It is suitable for some waterborne clear coats, adhesives, special functional coatings, or auxiliary resins. However, because there are many hydrophilic structures, dry-film water absorption, water resistance, and resistance to humidity and heat need to be carefully evaluated.

The core of a water-soluble system is not that “the easier it dissolves in water, the better,” but rather that a balance must be achieved between compatibility in water and water resistance of the dry film.

2.2 Water-reducible resins

Water-reducible resins usually become dilutable with water through neutralization into salts, introduction of hydrophilic groups, or addition of a small amount of co-solvent, allowing resins that are otherwise difficult to disperse directly in water to be diluted with water. Waterborne alkyds, waterborne polyesters, and some industrial baking coating resins often fall into this category. They often have certain advantages in wetting, leveling, gloss, and fullness, and are suitable for some metal decorative coatings, industrial coating systems, and wood coating systems.

These systems require particular attention to pH, degree of neutralization, co-solvent content, VOC, odor, storage stability, and water resistance. If the neutralizing agent or co-solvent is selected improperly, it may affect application odor, drying speed, and dry-film performance.

2.3 Emulsion-type resins

Emulsion-type resins are one of the most widely used categories in waterborne coatings. The resin is dispersed in water in the form of polymer particles. After application, as water evaporates, the polymer particles gradually come closer together and form a continuous coating film. Styrene-acrylic emulsions, pure acrylic emulsions, silicone-acrylic emulsions, and VAE emulsions are all common emulsion-type resins. Emulsion-type resins usually have relatively high solids content and can have relatively low VOC, making them suitable for architectural coatings, adhesives, some industrial coatings, and functional coatings.

For emulsion-type resins, key points include particle size, particle size distribution, MFFT, glass transition temperature Tg, freeze-thaw stability, mechanical stability, and compatibility with pigments and fillers. These factors affect the storage, application, low-temperature film formation, and dry-film properties of coatings.

2.4 Waterborne dispersions

Waterborne dispersions refer to systems in which the resin is stably dispersed in water in the form of microparticles or colloidal particles. Polyurethane dispersions PUD, waterborne epoxy dispersions, waterborne polyester dispersions, and similar systems usually rely on resin structural design, functional groups, and crosslinking design to meet higher performance requirements. They are commonly used in wood coatings, leather finishing, textile coatings, industrial coatings, anticorrosive coatings, flooring coatings, and other fields.

For waterborne dispersions, attention should be paid to pH, particle size, ionicity, functional groups, crosslinking method, additive compatibility, and application conditions. For high-performance systems, the dispersion stability of the resin itself and its later-stage crosslinking capability are equally important.

2.5 Hybrid resin systems

Hybrid resin systems improve properties that are difficult for a single resin to balance by combining two or more resin structures. For example, polyurethane-acrylic hybrid systems can be used to balance flexibility, abrasion resistance, hardness, and cost; epoxy-acrylic hybrid systems help improve adhesion, anticorrosive performance, and application adaptability; silicone-modified acrylic systems are often used to improve water resistance, weatherability, and stain resistance.

The value of hybrid systems lies in performance balance, but attention must also be paid to resin compatibility, dispersion stability, cost, and formulation adaptability. Hybridization does not necessarily mean a comprehensive improvement in performance. The key is whether the structural design corresponds to the target application requirements.

3 Main stabilization methods for waterborne systems

For waterborne resins to remain stable in water, they usually rely on interfacial stabilization, structural hydrophilization, electrostatic repulsion, steric hindrance, and similar mechanisms. Different stabilization methods affect the storage stability, application properties, and dry-film water resistance of the resin.

3.1 Surfactant stabilization

Surfactant molecules usually have a hydrophilic end and a hydrophobic end. They can reduce oil-water interfacial tension and allow resins or polymer particles to remain stably dispersed in water. In emulsion polymerization systems, surfactants are often used to form and stabilize polymer particles. Surfactants are helpful for emulsion preparation and storage stability, but residual free surfactants may affect dry-film water resistance, whitening resistance, and corrosion resistance. Therefore, high-performance waterborne resins often reduce the adverse effects of free surfactants through low-surfactant systems, reactive surfactants, or soap-free emulsions.

3.2 Hydrophilic group stabilization

By introducing hydrophilic groups such as carboxyl groups, hydroxyl groups, sulfonate groups, and amine salts into the resin structure, the resin can obtain water-dispersibility. Self-emulsifying polyurethane dispersions, waterborne alkyds, waterborne polyesters, and some waterborne epoxy systems often use this approach. The advantage of hydrophilic group stabilization is that the stability comes from the resin structure itself, leaving considerable room for system design. However, when the content of hydrophilic groups is too high, dry-film water absorption may increase, and water resistance, resistance to humidity and heat, and corrosion resistance may be affected.

3.3 Neutralization and salt formation

Resins containing carboxyl or amine groups can be neutralized into salts using amines, ammonia water, or acidic substances, thereby improving the resin’s ability to disperse or dilute in water. Neutralization and salt formation are commonly used in waterborne alkyds, waterborne polyesters, waterborne acrylics, waterborne polyurethanes, and other systems. Neutralization and salt formation can improve water dispersibility and application stability, but the degree of neutralization and pH must be controlled. The type and amount of neutralizing agent can affect odor, volatility, storage stability, the drying process, and dry-film water resistance.

3.4 Protective colloid stabilization

Protective colloids can adsorb onto or distribute around polymer particles, helping the particles remain stable in water through steric hindrance. Some emulsion, adhesive, and architectural coating systems use protective colloids for stabilization. Protective colloids are beneficial for emulsion stability and application adaptability, but some protective colloids are strongly hydrophilic and may increase the water absorption of the coating film. Therefore, in systems requiring high water resistance or high corrosion resistance, the effect of protective colloids on dry-film performance must be considered.

4 Core contradictions of waterborne resins

The technical difficulties of waterborne resins mainly arise from several fundamental contradictions. Understanding these contradictions helps explain why waterborne resins must remain stable in water while also delivering water resistance, weatherability, chemical resistance, and mechanical properties after film formation.

4.1 The contradiction between stability in water and dry-film water resistance

During storage and application, waterborne resins need to remain stable in water, so hydrophilic groups, surfactants, ionic stabilization, or protective colloids are often required. However, after the coating film dries, excessive hydrophilic components may lead to water absorption, whitening, reduced water resistance, and reduced corrosion resistance. This contradiction can be summarized as follows:

Stage	Required performance	Main technical requirements
Storage and application stage	The resin remains stable in water	Appropriate hydrophilic structures, surfactants, ionic stabilization, or steric stabilization are needed
Dry-film service stage	The coating film has water resistance, whitening resistance, and durability	Lower hydrophilic residue is preferred; the film should be dense, and crosslinking should be formed when necessary

The key in waterborne resin design is to make the resin sufficiently stable before application and to minimize water sensitivity after film formation.

4.2 The contradiction between low-temperature film formation and high hardness

After application, waterborne resins need to form a continuous coating film. If the resin is too hard, the particles are not easy to deform and coalesce under low-temperature conditions, which can affect film-forming integrity. If the resin is too soft, low-temperature film formation is easier, but dry-film hardness, blocking resistance, and stain resistance may be insufficient.

Resin characteristic	Advantages	Potential problems
Relatively soft	Better low-temperature film formation and better flexibility	Hardness, blocking resistance, and stain resistance may be insufficient
Relatively hard	Better hardness, blocking resistance, and stain resistance	Difficult low-temperature film formation, which may affect film integrity

This contradiction is usually balanced through resin Tg, MFFT, particle size, core-shell structure, coalescing agents, and crosslinking design. In waterborne resins, film-forming performance and final hardness are a mutually constrained performance combination.

4.3 The contradiction between low VOC and film-forming performance

Reducing VOC is an important goal for waterborne coatings. However, when some emulsions or dispersions form films at relatively low temperatures, they may require coalescing agents or small amounts of co-solvents to help resin particles deform and coalesce. If coalescing agents are reduced excessively, low-temperature film formation and coating film integrity may be affected. If more coalescing agent is used, VOC, odor, and residual effects after drying may increase. Therefore, low VOC is not simply a matter of reducing additives; it requires an overall balance among resin design, MFFT, application temperature, drying conditions, and the formulation system.

4.4 The contradiction between one-component convenience and high crosslinking performance

Waterborne resin systems can be divided into one-component 1K systems and two-component 2K systems. The core difference between the two is not only the packaging format, but the trade-off among storage stability, application convenience, and crosslinking performance.

In 1K systems, the resin, additives, and necessary reactive components are usually pre-designed into the same system. No on-site mixing is required before use, making application convenient. These systems are suitable for architectural coatings, ordinary wood coatings, and general industrial coatings. However, to ensure in-can storage stability, the reaction activity in 1K systems usually needs to be controlled. Therefore, under ambient self-drying conditions, if effective self-crosslinking, oxidative drying, baking, or radiation curing mechanisms are absent, high solvent resistance, high chemical resistance, and extremely high hardness may be limited.

In 2K systems, the resin and curing agent are usually stored separately and mixed in proportion before application. After mixing, functional groups such as hydroxyl, epoxy, and amine groups in the resin can react with the curing agent to form a crosslinked network, thereby improving the coating film’s water resistance, solvent resistance, chemical resistance, hardness, and abrasion resistance. However, 2K systems also bring challenges such as pot life, mixing ratio, application window, on-site management, and cost control.

System	Main advantages	Main limitations
1K system	Convenient to use; storage and on-site application management are relatively simple; good application tolerance	To ensure in-can stability, reaction activity is usually limited; under ambient self-drying conditions, high chemical resistance, high solvent resistance, and extremely high hardness may be limited
2K system	Crosslinking reactions can improve water resistance, solvent resistance, chemical resistance, hardness, and abrasion resistance	Requires on-site mixing, has pot-life limitations, and places higher demands on application management and cost control

The choice between 1K and 2K is essentially a balance between application convenience and high crosslinking performance. Ordinary architectural coatings, conventional wood coatings, and general industrial coatings usually place greater emphasis on application convenience and storage stability. Anticorrosive coatings, flooring coatings, high-chemical-resistance coatings, and high-wear-resistance industrial coatings more often require 2K systems or other crosslinking methods to improve film durability.

5 Understanding the technology map of waterborne resins

Waterborne resins can be understood from four observation dimensions: waterborne form, stabilization method, core contradictions, and basic parameters. This helps avoid judging performance only by resin name and also helps quickly identify the suitable application range and potential risks of a waterborne resin.

5.1 Four observation dimensions

Observation dimension	Question to answer	Main points of concern
Waterborne form	In what state does the resin exist in water?	Water-soluble type, water-reducible type, emulsion type, waterborne dispersion, hybrid system
Stabilization method	Why can the resin remain stable in water?	Surfactant, hydrophilic groups, neutralization and salt formation, protective colloids
Core contradictions	Which properties does the system most need to balance?	Stability in water vs. dry-film water resistance; low-temperature film formation vs. high hardness; low VOC vs. film-forming performance; 1K convenience vs. 2K high performance
Basic parameters	What should be checked for an initial assessment of suitability?	Solids content, pH, viscosity, particle size, Tg, MFFT, ionicity, functional groups, stability

5.2 Basic parameter checklist

Parameter	Main significance
Solids content	Affects application efficiency, volatile load per unit film thickness, viscosity, and formulation design space
pH	Affects resin stability, thickening systems, substrate adaptability, and corrosion risk
Viscosity	Affects production, storage, pumping, and application operation
Particle size	Affects gloss, transparency, stability, penetration, and film compactness
Tg	Affects hardness, flexibility, blocking resistance, stain resistance, and film-forming ability
MFFT	Affects low-temperature application and film-forming integrity
Ionicity	Affects compatibility with additives, pigments and fillers, electrolytes, and multivalent ions
Functional groups	Affect adhesion, crosslinking reactions, water resistance, and chemical resistance
Freeze-thaw stability	Affects safety during low-temperature transportation and storage
Mechanical stability	Affects grinding, dispersion, pumping, spraying, and application stability
Storage stability	Affects heat storage, sedimentation, thickening, demulsification, and long-term reliability in use

Basic parameters cannot determine final performance on their own, but they can help judge the application direction of a resin and formulation risks. For example, a low MFFT is beneficial for low-temperature film formation, but Tg, hardness, blocking resistance, and water resistance still need to be considered together. Smaller particle size may be beneficial for gloss and film compactness, but stability and formulation compatibility also need attention.

6 Summary

The core conclusions of this article can be summarized in four points:

① Waterborne resin is not the same as water-soluble resin.

Common waterborne resins may be water-soluble systems, water-reducible systems, emulsion systems, waterborne dispersions, or hybrid systems.

② The key to waterborne conversion lies in the stabilization method.

Surfactants, hydrophilic groups, neutralization and salt formation, and protective colloids can help resins remain stable in water, but they may also affect dry-film water resistance and long-term performance.

③ The core difficulty of waterborne resins is performance balance.

Stability in water vs. dry-film water resistance, low-temperature film formation vs. high hardness, low VOC vs. film-forming performance, and 1K convenience vs. 2K high performance are common fundamental contradictions in the design and application of waterborne resins.

④ Understanding waterborne resins requires joint assessment of form, stabilization method, core contradictions, and basic parameters.

Judging application performance only by resin name is not accurate. Resin form, particle size, pH, Tg, MFFT, functional groups, ionicity, stability, and other factors should be considered comprehensively.

7. Representative Chemical Categories and Applications Related to Waterborne Resin Technology

Note: The following products are mainly intended for scenarios such as waterborne resin synthesis, emulsion polymerization, dispersion stabilization, structural control, and formulation research. Different product specifications may contain organic solvents, stabilizers, or involve specific safety risks, and therefore should not be regarded as directly suitable for low-VOC finished coating formulations. Actual product selection should be confirmed based on the target system, VOC calculation, regulatory requirements, SDS/COA, and specific process conditions.

Table 1 Waterborne-Functional Monomers, Reactive Hydrophilic Monomers, and Internal Emulsifying Raw Materials

Category	CAS No.	Aladdin Cat. No.	Name	Specification or Purity	Product Features and Applications
Carboxyl-functional monomer	79-10-7	A397753	Acrylic acid	Anhydrous grade, ≥99%, contains 200 ppm MEHQ stabilizer	Used for introducing carboxyl groups into waterborne acrylic resins, emulsion stabilization, adhesion adjustment, and research on alkali-soluble resins
Carboxyl-functional monomer	79-41-4	M434201	Methacrylic acid	Suitable for synthesis, stabilized with hydroquinone monomethyl ether	Used for hydrophilic modification of waterborne acrylic resins, hardness adjustment, alkali-solubilizable systems, and emulsion polymerization research
Bio-based carboxyl monomer	97-65-4	I106140	Itaconic acid	Chemically pure, ≥99%	Used for carboxyl-functionalized waterborne polymers, bio-based waterborne resins, and emulsion stability research
Reactive sulfonate monomer	3039-83-6	S130044	Sodium vinylsulfonate	25 wt.% in H₂O	Used for reactive hydrophilic modification, preparation of anionic waterborne resins, and research on electrolyte stability of emulsions
PUD internal emulsifying monomer	10097-02-6	B115196	2,2-Bis(hydroxymethyl)butyric acid (DMBA)	≥98%	Used for internal emulsification of waterborne polyurethane, carboxyl group introduction, dispersion stabilization, and particle size control research
PUD internal emulsifying monomer	4767-03-7	B104539	2,2-Bis(hydroxymethyl)propionic acid (DMPA)	≥98%	Used for preparation of polyurethane dispersions, carboxyl-based waterborne modification, ionic stabilization, and neutralization/salt formation research
Sulfonic acid functional monomer	15214-89-8	A106798	2-Acrylamido-2-methyl-1-propanesulfonic acid (AMPS)	≥98%	Used for sulfonic acid group modification of waterborne polymers, emulsion stabilization, electrolyte resistance, and hydrophilic structure research
Reactive sulfonate monomer	2695-37-6	S169174	Sodium 4-styrenesulfonate	≥90% (T)	Used for ionic modification of styrenic waterborne polymers, reactive emulsification, and colloidal stabilization research
Reactive sulfonate monomer	2495-39-8	S121961	Sodium allylsulfonate	≥90%	Used for reactive hydrophilic modification of waterborne resins, emulsion polymerization stabilization, and research on anionic functional polymers

Table 2 Emulsion Polymerization Monomers, Copolymers, and Structural Raw Materials for Waterborne Polyurethane

Category	CAS No.	Aladdin Cat. No.	Name	Specification or Purity	Product Features and Applications
Soft monomer	141-32-2	B100036	Butyl acrylate (BA)	Chemically pure, ≥98%, contains 50 ppm MEHQ stabilizer	Used for soft-segment design in waterborne acrylic emulsions, low-temperature film formation, flexibility, and glass transition temperature adjustment
Vinyl ester monomer	108-05-4	V104471	Vinyl acetate	Chemically pure, ≥98%	Used for polyvinyl acetate emulsions, ethylene-vinyl acetate copolymer systems, and research on construction adhesives
Ethylene-vinyl acetate copolymer	24937-78-8	P432376	Poly(ethylene-co-vinyl acetate) (PEVA)	Vinyl acetate 12 wt.%, melt index 8 g/10 min (190°C/2.16 kg)	Used for research on flexibility, blend modification, and structure-property relationships of EVA/PEVA thermoplastic copolymers; can serve as a performance comparison reference for VAE-related materials
Hard monomer	80-62-6	M109623	Methyl methacrylate (MMA)	AR, ≥99%, contains 30 ppm DMBP stabilizer	Used for adjusting hardness, weatherability, transparency, and glass transition temperature of waterborne acrylic resins
Hard monomer	100-42-5	S110376	Styrene	≥99%, stabilized with 10–15 ppm 4-tert-butylcatechol	Used for synthesis of styrene-acrylic emulsions, hardness improvement, cost adjustment, and research on architectural coating resins
Polyurethane chain extender	110-63-4	B1508458	1,4-Butanediol (BDO)	Anhydrous grade, ≥99%	Used for chain extension of waterborne polyurethane, hard-segment structure adjustment, mechanical properties, and abrasion resistance research
Polyether polyol	25190-06-1	P432410	Poly(tetrahydrofuran) (PTHF)	Average Mn ~2900	Used for soft-segment design in waterborne polyurethane, flexibility, low-temperature performance, and research on elastic coatings
Multifunctional alcohol	77-99-6	T110597	Trimethylolpropane (TMP)	≥98%	Used for research on branched structures, crosslinking density, and hardness adjustment in waterborne polyurethane, alkyd, and polyester resins

Table 3 Emulsification, Dispersion, Protective Colloid, Thickening/Stabilization, and Neutralization Products

Category	CAS No.	Aladdin Cat. No.	Name	Specification or Purity	Product Features and Applications
Protective colloid	9002-89-5	P119362	Mowiol® PVA-124 Polyvinyl Alcohol (PVA)	Viscosity: 54–66 mPa·s	Used as a protective colloid for emulsions, for stabilizing polyvinyl acetate systems, and for research on film-forming water-soluble polymers and waterborne adhesives
Water-soluble dispersing stabilizer	9003-01-4	P661414	Poly(acrylic acid) (PAA)	Viscosity ≤2000 cP (25°C)	Used for pigment and filler dispersion, polycarboxylate dispersing systems, pH-responsive polymers, and research on stability of waterborne formulations
Cellulose ether thickener	9004-65-3	H1506257	Hydroxypropyl methylcellulose (HPMC)	Substitution type 2910; viscosity: 400 mPa·s; methoxy: 28–30%; hydroxypropyl: 7.0–12%	Used for thickening, water retention, application rheology, and emulsion stability research in waterborne coatings
Anionic wetting/emulsifying agent	577-11-7	D476741	Docusate sodium (AOT)	PharmPure™, USP	Used in model emulsion-polymerization systems, wetting and spreading, microemulsion systems, and waterborne dispersion stability research
Cellulose ether thickener	9004-62-0	H434475	2-Hydroxyethyl cellulose (HEC)	Average Mw ~380,000	Used for rheology control, sag resistance, storage stability, and application performance research in waterborne coatings
Anionic emulsifier	25155-30-0	S592217	Sodium dodecylbenzenesulfonate (SDBS)	Anion active matter, 85%	Used for styrene-acrylic emulsions, acrylic emulsion polymerization, particle stabilization, and surfactant screening experiments
Anionic emulsifier	151-21-3	S108350	Sodium dodecyl sulfate (SDS)	ACS, ≥99%	Used in model emulsion-polymerization systems, micelle formation, particle size control, and emulsification stability research
Amine neutralizing agent	121-44-8	T140677	Triethylamine	Anhydrous grade, ≥99.5%, water ≤50 ppm	Used for neutralization and salt formation of carboxyl-containing resins, dispersion of waterborne polyurethane, pH adjustment, and comparative research on amine volatility
Amine neutralizing agent	108-01-0	D109080	N,N-Dimethylethanolamine (DMEA)	Distilled grade, ≥99.5%	Used for neutralization, pH adjustment, and dispersion stabilization of waterborne alkyd, waterborne polyurethane, and waterborne acrylic resins
Amine pH regulator	124-68-5	A755868	2-Amino-2-methyl-1-propanol	BioReagent, ≥95%	Used for pH buffering in waterborne coatings, pigment and filler dispersion, emulsion stabilization, and research on alkali-soluble resin systems
Ammonia neutralizing agent	1336-21-6	A112081	Ammonia solution	ACS, 28.0–30.0% NH₃ basis	Used for carboxyl resin neutralization, pH adjustment, preparation of ammonium salt systems, and waterborne resin laboratory research

Table 4 Initiation Systems, Redox Systems, and Molecular Weight Control Products

Category	CAS No.	Aladdin Cat. No.	Name	Specification or Purity	Product Features and Applications
Reducing agent	50-81-7	L432790	L-Ascorbic acid	UltraBio™, ultrapure grade, ≥99.5% (RT)	Used for low-temperature redox initiation systems, emulsion polymerization, residual monomer control, and mild reduction experiments
Reducing agent	7631-90-5	S598869	Sodium bisulfite	SO₂ content ≥58.5%	Used for redox emulsion polymerization, persulfate-matched reducing systems, and residual oxygen control research
Water-soluble initiator	7727-54-0	A112447	Ammonium persulfate (APS)	PrimorTrace™, ≥99.99% metals basis	Used for free-radical polymerization initiation in acrylic emulsions, styrene-acrylic emulsions, and waterborne polymers
Oxidizing agent	75-91-2	B106035	tert-Butyl hydroperoxide (TBHP)	70% in H₂O	Used for redox initiation systems, low-temperature emulsion polymerization, residual monomer reduction, and waterborne polymer post-treatment research
Water-soluble initiator	7727-21-1	P292964	Potassium persulfate	≥99%	Used for waterborne emulsion polymerization, acrylic resin synthesis, and free-radical initiation of styrene-acrylic emulsions
Chain transfer agent	25103-58-6	D106952	tert-Dodecyl mercaptan, mixture of isomers	≥98%	Used during the synthesis stage of emulsion polymerization for molecular weight control, resin viscosity adjustment, and polymer chain length regulation experiments; odor, residue, and safe handling should be considered
Chain transfer agent	112-55-0	D105610	1-Dodecanethiol (NDM)	≥98%	Used during the synthesis stage of waterborne acrylic and styrene-acrylic emulsions for molecular weight adjustment, film-forming performance, and viscosity control research; odor, residue, and safe handling should be considered
Reducing agent	149-44-0	S770553	Sodium formaldehyde sulfoxylate hydrate	≥95% (T)	Used for redox initiation systems, low-temperature emulsion polymerization, and residual monomer reduction experiments

Note: The above are representative Aladdin products. More product specifications can be searched on the Aladdin official website by “product name / CAS / catalog number.”

References

[1] European Parliament and Council of the European Union. Directive 2004/42/CE on the limitation of emissions of volatile organic compounds due to the use of organic solvents in certain paints and varnishes and vehicle refinishing products. Official Journal of the European Union, 2004.

[2] American Coatings Association. Technology Roadmap #3: Durability and Water Resistance of Waterborne Coatings. American Coatings Association, 2024.

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

[4] Wicks Z. W., Jones F. N., Pappas S. P., Wicks D. A. Organic Coatings: Science and Technology. 3rd ed. Hoboken: John Wiley & Sons, 2007.

[5] Tracton A. A. Coatings Technology Handbook. 3rd ed. Boca Raton: CRC Press, 2006.

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