II. Types of Acrylic Resins (1) Classification by Thermal Behavior (Film-forming Characteristics): ① Thermosetting Acrylic Resins: Based on acrylic monomers as their fundamental components, these resins undergo further reactions—either among their own functional groups or with active functional groups in other resin systems (such as amino resins, epoxy resins, polyurethanes, etc.)—during the heating or film-forming process. This results in curing to form a cross-linked network structure. They exhibit excellent color retention, high hardness, good solvent and weather resistance, as well as superior abrasion and scratch resistance. ② Thermoplastic Acrylic Resins: Generally linear polymers, these resins do not undergo further cross-linking reactions during heating or film formation. They can be repeatedly softened by heat and solidified by cooling. They possess excellent gloss and color retention, as well as good water and chemical resistance. Furthermore, they are characterized by ease of molding and processing, rapid film drying, and convenient application. (2) Classification by Physical State: ① Solid Acrylic Resins: Primarily consisting of thermoplastic acrylic resins—though also including some thermosetting acrylic resins—these materials exhibit excellent mechanical and optical properties at room temperature. ② Liquid Acrylic Resins: These can be broadly categorized into two main groups: solvent-based acrylic resins and water-based acrylic resins. Solvent-based acrylic resins typically utilize organic solvents as their medium, whereas water-based acrylic resins utilize water as their medium. Solvent-based Acrylic Resins: These are primarily synthesized through the copolymerization of pure acrylate monomers, resulting in materials characterized by small particle sizes, multifunctionality, and outstanding performance. They typically present as viscous liquids and are widely utilized in fields such as coatings and adhesives. Preparation methods for solvent-based acrylic resins include emulsion polymerization and suspension polymerization. Emulsion polymerization involves the reaction and polymerization of monomers, initiators, and reaction solvents; typically, aromatic solvents (such as toluene or xylene) or esters (such as ethyl acetate or butyl acetate) are employed as the reaction medium. Suspension polymerization is a relatively complex manufacturing process, primarily utilized for the production of solid resins. Water-based acrylic resins encompass three major categories: water-soluble, water-dispersible, and emulsion-based types. What is commonly referred to within the industry as "water-soluble resin" is, in fact, a dispersion of acrylic resin aggregates formed in water (typically ranging from 0.01 to 0.1 μm); technically, this falls within the colloidal category. However, because the particles within this dispersion are extremely fine—resulting in a transparent appearance—we generally designate it as "water-soluble" to distinguish it from ...

Acrylic resins constitute a broad category of synthetic polymers produced through the copolymerization of acrylate monomers (such as methyl acrylate, ethyl acrylate, butyl acrylate, hydroxyethyl acrylate, etc.) and methacrylate monomers (such as methyl methacrylate—commonly known as the monomer for organic glass or PMMA). I. Core Characteristics and Advantages Excellent Film-Forming Properties: Capable of forming a continuous, transparent, and tough film on the surface of paper. Outstanding Weather Resistance and Anti-Aging Properties: Stable under UV exposure, resistant to yellowing, and capable of maintaining its aesthetic appearance over the long term. Superior Chemical Resistance: Exhibits strong resistance to various chemicals, including oils, fats, acids, and alkalis. Good Adhesion: Demonstrates strong bonding affinity with paper fibers, pigments, and other fillers. Excellent Transparency and Optical Properties: Inherently colorless and transparent, enabling the creation of coatings with high gloss and exceptional clarity. Tunable Flexibility: By adjusting the monomer ratio and polymerization process, the hardness or softness of the resin can be precisely controlled—ranging from highly flexible to extremely rigid.Environmentally Friendly and Safe: Water-based systems that comply with modern environmental regulations. Room 1013, Building A5, Financial Port Center, Yangzijiang Road, Baohe District, Hefei City， Anhui province, China Factory Address: Feidong County Industrial Park, Hefei City, Anhui Province, China +86 0551 63459511 sales@sinogracechem.com vivisinograce@outlook.com +8615755193346 http://www.sinogracechem.com

01 Polyurethane The structure of polyurethane is formed by the reaction of polyisocyanates (e.g., diisocyanate OCN-R-NCO) and polyols (e.g., diol HO-R-OH), where urethane segments are repeating structural units. Polyurethane structures have structures similar to amide and ester groups; therefore, the chemical and physical properties of polyurethane are between those of polyamides and polyesters. Synthesis of Waterborne Polyurethane Waterborne polyurethane (WPU) is a binary colloidal system using water as a medium, including aqueous solutions, aqueous dispersions, and aqueous emulsions. Polyurethane particles are dispersed in a continuous aqueous phase, also known as waterborne PU or water-based PU. It has advantages such as being non-toxic, non-flammable, environmentally friendly, energy-saving, safe and reliable, not easily damaging the coated surface, and easy to operate and modify. Classification of Waterborne Polyurethanes Based on appearance, waterborne polyurethanes can be classified into polyurethane aqueous solutions (particle size <1nm), polyurethane dispersions (particle size 1nm～100nm), and polyurethane emulsions (particle size >100nm). Based on the charge properties of the hydrophilic groups, waterborne polyurethanes can be classified into anionic, cationic, and nonionic waterborne polyurethanes. Based on the synthetic monomers, waterborne polyurethanes can be classified into polyether-type, polyester-type, and polyether/polyester hybrid types. Based on product packaging, waterborne polyurethanes can be classified into single-component and two-component waterborne polyurethanes. 02 Raw Materials for the Synthesis of Waterborne Polyurethanes Polyisocyanates Polyisocyanates used in the synthesis of waterborne polyurethanes include two main categories: aromatic and aliphatic. Aromatic polyols mainly include TDI (toluene diisocyanate) and MDI (diphenylmethane diisocyanate); aliphatic polyols mainly include HDI (hexamethylene diisocyanate) and IPDI (isophorone diisocyanate). Oligomer polyols used in the synthesis of waterborne polyurethanes mainly include two categories: polyether type and polyester type. They constitute the soft segment of polyurethane. Chain extenders are commonly used in the synthesis of waterborne polyurethanes to adjust the molecular weight and the ratio of soft to hard segments. Chain extenders are mainly polyfunctional alcohols or amine compounds. Hydrophilic agents (hydrophilic chain extenders) are chain extenders that can introduce hydrophilic groups onto the main chain of waterborne polyurethane macromolecules. They are functional monomers used in the preparation of waterborne polyurethanes. These chain extenders contain carboxyl groups, sulfonic acid groups, or tertiary amine groups. Polyurethanes with these groups become water-soluble after neutralization and ionization. Neutralizing Agent (Salt-forming Agent) A neutralizing agent is a reagent that can form salts with carboxyl, sulfonic acid, or tert...

Acrylic resins are an indispensable and commonly used resin in water-based coatings. They are widely used in metal coatings, ABS and PC coatings, and glass coatings requiring hardness, especially solid acrylic resins. There are many types of solid acrylic resins. Some solid acrylic resins can be used to produce water-based paints, including the currently popular UV-cured coatings and high-solids coatings. With increasing environmental awareness, water-based coatings are bound to become the mainstream. Advantages of solid acrylic resins: Low storage and transportation costs, good safety. Most solid acrylic resins use methacrylates as the main monomer, and their weather resistance and chemical resistance are superior to acrylic monomers and styrene. They have good potential for promotion in exterior architectural coatings, containers, and automotive refinish paints. Because certain types of solid acrylic resins can be used as water-based UV-cured paints and high-solids coatings, adjusting the monomers can produce low-pollution and low-odor acrylic exterior architectural coatings. Solid acrylic resins contribute to the development of low-pollution coatings in the coating industry. Domestically produced solid acrylic resins are now in mass production, achieving similar performance to imported resins in certain aspects, such as dissolution speed and weather resistance, thus making a new contribution to the promotion of acrylic paints. Organosilicon-modified acrylic resins In addition, organosilicon-modified acrylic resins are also at the forefront of development, as they can be used in the automotive industry for elastic topcoats and interior and exterior wall paints. Organosilicon-modified acrylic coatings are high-performance coatings created by introducing organosilicon polymers into the acrylate structure through a reaction. Silyl chloride-acrylic resin coatings have good performance and excellent adhesion to non-ferrous metals and various plastics. Therefore, its applications are constantly being developed. To meet the latest requirements, users urgently need to develop single-component resin products with good coating application properties and the same performance as two-component products. Sinograce Chemicalhas served water-based coating customers for over 15 years, possessing experience in producing corresponding acrylic resin products to meet the needs of different substrates. For more product information and technical guidance, please contact us.