Abstract: The present invention provides a method for preparing aqueous emulsion via water dispersible polyurethane grafted acrylate copolymerization, which first uses 2-8 wt % of isocyanate, 7-15 wt % of a polyol, 0.3-1.0 wt % of a polyol bearing hydrophilic carboxylic monomer, and 0.1˜2.0 wt % of an acrylic ester containing a hydroxyl group to cause a reaction and form an unsaturated double bond bearing polyurethane prepolymer, the NCO content of which is approximately 2˜8%. This is followed by introducing 0.3-1.0 wt % of an alkalic neutralizer to carry out a neutralization reaction, and then 25-40 wt % of pure water is used to effect water dispersion, after which 0.1˜0.5 wt % of a chain extender is added to form an ethylenically unsaturated water dispersible polyurethane prepolymer. A reaction system is formed by adding 40-60 wt % of deionized water, 20˜30 wt % of methyl methacrylate or an acrylate monomer to the ethylenically unsaturated water dispersible polyurethane prepolymer, and 0.1˜2.

Abstract: The present invention provides a polymerization method for acrylic latex without emulsifier, in which a reaction system is formed from 40˜60 wt % of pure water and 2˜9 wt % of carboxylic acid monomers with carbon-carbon double bond polymerizable functional groups (A), and 40˜50 wt % of methyl methacrylate or acrylate monomers (B), and 0.2˜2.0 wt % of inorganic alkaline solution is first used to adjust the pH value of the reaction system to within a pH range of 9.0˜13.0, then 0.2˜1.0 wt % of peroxide sulfates are used as initiators, and emulsification polymerization is carried out. At the end of the reaction, organic amine compounds are used to adjust the pH value of the obtained aqueous resin latex to within the pH range 7.0˜9.5. Particle diameters of the manufactured aqueous resin latex are approximately 100˜30 nm, uniformly distributed and have excellent outward appearance. Moreover, acid value is low at 3.5˜6.5 mgKOH/g, and Its specific gravity is approximately 1.

Abstract: The present invention provides a polymerization method for acrylic latex without emulsifier, in which a reaction system is formed from 40˜60 wt % of pure water and 2˜9 wt % of carboxylic acid monomers with carbon-carbon double bond polymerizable functional groups (A), and 40˜50 wt % of methyl methacrylate or acrylate monomers (B), and 0.2˜2.0 wt % of inorganic alkaline solution is first used to adjust the pH value of the reaction system to within a pH range of 9.0˜13.0, then 0.2˜1.0 wt % of peroxide sulfates are used as initiators, and emulsification polymerization is carried out. At the end of the reaction, organic amine compounds are used to adjust the pH value of the obtained aqueous resin latex to within the pH range 7.0˜9.5. Particle diameters of the manufactured aqueous resin latex are approximately 100˜30 nm, uniformly distributed and have excellent outward appearance. Moreover, acid value is low at 3.5˜6.5 mgKOH/g, and Its specific gravity is approximately 1.