Synthesis And Application For Elastic Acrylic Polymer Latex

The development trends of architectural coatings are environmentally friendly, highperformance and functionality and architectural coatings with various advantages are bound toreplace the tiles and other wall decoration materials. But architectural coatings need to begradually improved in the process to adapt to people’s needs. The issues of exterior coatingsfor use in external walls, such as cracks, out gray and poor stain resistance are bound to be afocus for researchers, which also must be addressed. Therefore, the development of elasticlatex with high-performance is an effective way to achieve high performance elastic coating.Acrylate polymers have excellent performances such as weather resistance, durability, filmand low temperature flexibility. And acrylate polymers are widely used in the preparation offlexible latex because their rich source of raw materials and simple production process.In this work, acrylate elastic latex was prepared by the polymerization process ofpre-emulsified semi-continuous combined with dropwise of monomers with methylmethacrylate as the hard monomer, butyl acrylate as soft monomer, acrylic acid as functionalmonomer, monomer III as cross-linking monomer, inorganic particles as additive of thepolymer emulsion. Influence of the amount of initiator, polymerization temperature,selections and amount of the emulsifier system, amount of the cross-linking monomer, theintroduction manner and amount of inorganic constituents and the forms of silica on themechanical properties, optical properties, heat resistance and water absorption of the polymerfilms were investigated.The results showed that: cross-linked acrylic elastic latex with the best performances wasobtained under the conditions of polymerization temperature of80℃, amounts of emulsifier,initiator, cross-linking monomer and the mass ratio of hard and soft monomer of3.0%,0.2%,2.0%and2.6:1. When the nano-SiO2with the amount of0.5%introduced using the method ofpre-emulsification, silica sol with the amount of1.5%introduced using the method ofemulsion physical blend, TEOS introduced with the A-151together with a total amount of9%,organic/inorganic hybrid emulsion with excellent performances could be prepared. And organic/inorganic acrylic elastic latex film with the best properties could be obtained whenSiO2introduce method in the form of TEOS and A-151.Elastic coating of acrylate was prepared with home-made organic/inorganic compositeelastic latex as based material. Influences of the amount of emulsion, the volumeconcentration of pigments and fillers, the choice and amounts of coalescent and defoamer onelastic coating system and tensile properties, stain resistance and other properties of the filmwere investigated. Studies had shown that: under the conditions of the amount of emulsion of45%, volume concentration of pigment and filler of37%, ester-12with the amount of2.4%as coalescent and NXZ with the amount of0.3%as defoamer, elastic coating system withgood elongation and stain resistance and the best comprehensive performance was obtained.