Silicone-modified styrene-butadiene latex and preparation method thereof

Abstract

The invention discloses organic silicone modified styrene-butadiene latex and a preparation method thereof. By adopting a core-shell emulsion polymerization process, the latex takes deionized water as a dispersion medium, and butadiene and styrene as main monomers, adopts an organic silicone monomer for functional modification, and uses reactive emulsifiers, such as allyl ether sulfonates, acrylamide sulfonates, maleic acid derivatives and the like. The particle size of the latex is 120-150nm; the particle size distribution presents relatively narrow monodispersion; the liquidity is good; the viscosity is appropriate; the latex has very good mechanical stability and chemical stability, remarkable improvements on alkali resistance, water resistance, yellowing resistance and the like, and particularly solves the defects that present acrylate emulsion in the market is not good in alkali resistance or water resistance when used on a textile coating of a fiberglass mesh, the coating yellows easily, and the present acrylate emulsion is sticky when heated and fragile when cooled, therefore, the comprehensive performance of the latex is greatly superior to those of the commonly used acrylics and modified emulsion.

Description

technical field [0001] The invention relates to a preparation method of silicone-modified styrene-butadiene latex, which is mainly used for the coating of glass fiber mesh cloth and textile coating, and can also be used for adhesives in other fields, such as leather, etc., belonging to polymer materials In the field of emulsion polymerization technology. Background technique [0002] At present, there are still many defects in the glass fiber mesh coating agent for wall repair in the domestic market. The existing glass fiber mesh mainly uses polyacrylate emulsion coating, which has "hot stickiness and cold brittleness". Alkalinity, yellowing resistance, poor strength and other defects, while the existing styrene-butadiene latex, carboxylated styrene-butadiene latex, etc. are still not ideal in terms of water resistance, strength, and yellowing resistance. [0003] Acrylate emulsion, its main monomers are butyl acrylate, ethyl acrylate, vinyl acetate, methyl methacrylate, et...

AI Technical Summary

Problems solved by technology

However, there are carboxyl groups on its molecular chain. When the adhesive films are superimposed into rolls, the adjacent adhesive films will stick together at high temperature, resulting in easy adhesion at high temperature and difficulty in unwinding the grid cloth.

In addition, whether it is carboxylated butylbenzene or acrylic latex, because the amount of emulsifier used in the reaction process is too large, generally 3 to 5 parts, a large amount of free emulsifier remains in the latex after the reaction is completed, resulting in easy film formation. absorb water

[0005] Fiberglass mesh requires high temperature resistance, high strength, good positioning, alkali and water resistance, etc., and its application in the construction industry is becoming more and more common. However, fiberglass mesh is easily leached by alkaline media in cement. Corrosion reduces the strength of the mesh cloth. By changing some chemical components of the glass fiber, its alkali resistance rate can be improved, but the cost is too high; coating the surface of the mesh cloth with a polymer coating can improve the alkali resistance of the mesh cloth. corrosion and strength

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