Synthesis of Soap-Free Silicone Acrylic Emulsion and Its Application in Architectural Coatings

Based on methyl methacrylate (MMA), methacrylic acid (MAA), vinyl trimethoxysilane (YDH-171), tetramethyltetravinyl cyclosiloxane (DV4), allyl hydroxyethyl ether (AOE) is the raw material, K2S2O8-Na2SO3 is the redox initiation system, the implementation of self-emulsification, the free radical soap-free emulsion polymerization of simultaneous ring opening, the synthesis of soap-free silicone-acrylic emulsion. Optimized by L9(3)4 orthogonal experiment The monomer ratio is: when the system pH value is 4.5~5, the mass ratio of K2S2O8 to Na2SO3 is 2:1 and the dosage is 0.5% of the total monomer mass, the mass ratio of MAA, AOE, YDH, DV4, MMA It is 8:9:4:20:59, and the gel rate of the polymerization reaction is 0.18% at this time. Infrared spectroscopy confirms that DV4 has opened the ring and all monomers have participated in the copolymerization reaction; thermogravimetric analysis shows that the soap-free silicone acrylic emulsion The thermal stability of the latex is good, the maximum thermal decomposition temperature is 449℃; the particle size and transmission electron microscopy analysis show that the average particle size of the latex particles is 158 nm, the particle size distribution is narrow (PDI=0.031, Zeta=-53.9 m V), and it has a monodisperse Conventional performance testing shows that the various indicators of the emulsion meet the requirements of the national standard. The silicone-acrylic emulsion is mixed with rutile titanium dioxide and various additives to form a building interior wall coating, and the main performance indicators of the coating meet or exceed National standard.
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