Water Based Acrylic Polymer Emulsion

Compared with traditional solvent based coatings, water based acrylic polymer emulsion has many advantages, such as low price, safe use, saving resources and energy, reducing environmental pollution and public hazards. Waterborne acrylic alkene resin coating is a pollution-free coating with the fastest development and most varieties among waterborne coatings.

Water based acrylic polymer emulsion consists of acrylic resin emulsion, acrylic resin aqueous dispersion (also known as water thinable acrylic acid) and acrylic resin aqueous solution. Emulsions are mainly emulsified by oily monomers in water and initiated by water-based free radical initiators, while resin dispersions are synthesized by free radical polymerization or stepwise polymerization. From the particle size, the particle size of the emulsion > water dispersion particle size > water solution particle size was observed. From the perspective of application, the former two are the most important.

Acrylic emulsion is mainly used in latex paint, which has important applications in the construction coatings market, and its application is expanding. In recent years, the development and application of acrylic resin aqueous dispersion have attracted more and more attention, and its application in the field of industrial coatings and civil coatings has been expanding. According to monomer composition, it is usually divided into pure acrylic emulsion, styrene acrylic emulsion, vinyl acetate emulsion, silicone acrylic emulsion, tertiary vinegar (TERT carbonate vinyl acetate) emulsion, and Shu (Tertiary carbonate acrylate) emulsion.

Water based acrylic polymer emulsion can be divided into two categories: water dispersible and water-soluble. The former is based on water emulsion or hydrosol. The water-soluble acrylate coating is made of copolymer resin with active crosslinkable functional groups. It is a multi-system thermosetting coating. When making the paint, it is added or not added with crosslinking resin to crosslink the active functional groups during film formation. The development of waterborne acrylate coatings can replace most organic volatile solvents with water under the condition of ensuring various unique properties of acrylate coatings, so as to greatly reduce air pollution.

Water based acrylic polymer emulsion is mostly anionic. The monomers of the copolymerization resin use suitable unsaturated carboxylic acids, such as acrylic acid, methacrylic acid, maleic anhydride, methylene succinic acid, etc., so that the side chains are carboxyl groups, and then can be neutralized by organic amine or ammonia to form salt soluble water. Two. In addition, the water solubility of the resin can be increased by selecting appropriate monomers to introduce hydrophilic groups such as - Oh hydroxyl, - CONH₂ amido or - o-ether bond. Neutralized and salted acrylic resin can be dissolved in water, but its water solubility is not very strong. It often forms milky liquid or solution with high viscosity. Therefore, a certain proportion of hydrophilic cosolvent must be added to the water-soluble resin to increase the water solubility of the resin.

The dry coating of water based acrylic polymer emulsion mainly contains acrylic emulsion polymer composition with certain composition and certain method. The coating has improved scrubbing resistance. The improved scrubbing resistance is compared to the dry coating with acrylic emulsion polymer base which does not use the same method, and the coating can also provide alkali resistance grade suitable for use on alkaline substrates such as masonry substrates.

The scrubbing resistance of water based acrylic polymer emulsion is the property that must be generally considered as a coating. The problem faced by the inventor is to ensure that the proper emulsion polymer, waterborne coating composition and the method of improving the scrubbing resistance of the coating are ensured, so that the effective scrubbing resistance level can be achieved. Other effective polymerization processes that can achieve this goal can also be used. In the acrylic emulsion polymer, when the emulsion polymer of at least 40% is generated by redox polymerization in the presence of chain transfer agent of 0.001~ 0.05 mol/kg dry polymer, the composition can provide effective scrubbing resistance and proper alkali resistance.

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