Synthesis and Application of Elastic Acrylic Emulsion

At present, architectural coatings need to be gradually improved in the process of meeting people's needs, and they are developing in the direction of safety, high performance, and versatility.The advantages of architectural coatings will definitely replace other wall decorative materials such as tiles. However, the current problems of wall ash, cracks, and poor stain resistance that appear during the use of exterior wall architectural coatings need to be solved urgently. Therefore, the search for methods for preparing high-performance elastic coatings has gradually become a research field in the field of architectural coatings. Hot spot, and the development of high-performance elastic emulsion has become one of the effective methods to solve the problem of high-performance elastic coating preparation. Acrylic coating film has excellent weather resistance, durability, film-forming properties, low-temperature flexibility, and has a rich source of raw materials, and the production process is simple The acrylate polymer emulsion is widely used in the preparation of elastic emulsions. In this paper, a pre-emulsified semi-continuous combined monomer dropwise addition is used as the polymerization process, with methyl methacrylate as the hard monomer and butyl acrylate as the soft monomer. Acrylic acid is a functional monomer, and monomer Ⅲ is a crosslinking monomer. Inorganic particles are introduced into the polymer emulsion to prepare an acrylate elastic emulsion. The amount of initiator, polymerization temperature, selection and dosage of emulsifier system, and crosslinking monomer are investigated. The amount of the polymer film, the introduction method and amount of inorganic components, the form of silica, etc. affect the mechanical properties, water absorption, optical properties, heat resistance and other properties of the polymer film. The results show that: when the polymerization temperature is 80 ℃, the emulsifier When the dosage, the amount of initiator, the amount of crosslinking monomer, and the ratio of soft and hard monomers are 3.0%, 0.2%, 2.0%, and 2.6:1 respectively, the crosslinked acrylate elastic emulsion obtained has the best performance. Nano SiO2 is introduced by pre-emulsification method, silica sol is introduced by physical blending method with emulsion, when TEOS and A-151 are introduced together, when the dosage is 0.5%, 1.5%, and 9%, organic/inorganic with excellent performance can be prepared. The composite emulsion, and the organic/inorganic acrylate elastic latex film prepared by adding TEOS and A-151 to SiO2 has the best performance. The self-made organic/inorganic composite elastic latex was used as the base material to prepare the acrylate elastic coating. The emulsion was investigated. The effect of the amount, the volume concentration of pigments and fillers, the selection and amount of film-forming aids and defoamers on the elastic coating system and the tensile properties of the paint film, stain resistance and other properties. Studies have shown that: when the amount of emulsion is 40%, The volume concentration of pigments and fillers is 37%, alcohol ester twelve is selected as the film-forming aid, and NXZ is the defoaming agent. When the dosage is 2.4% and 0.3%, the prepared elastic coating has good elongation at break. And stain resistance, and the overall performance of the coating reaches the best