Acrylic ester elastic emulsion of room temperature self-crosslinking core-shell structure and preparing method thereof

Abstract

The invention relates to an acrylic ester elastic emulsion of a room temperature self-crosslinking core-shell structure and a preparing method thereof, and belongs to the field of macromolecular polymer. The purpose of the invention is to improve the application requirements of elastic coating, such as low-temperature elasticity and anti-contamination, tensile strength and flexibility and the like. The technical scheme adopted in the invention is as follows: using a core-shell polymerization process, introducing cross-linking monomer to shell layer, designing core layer glass state temperature (Tg) to be minus 40 to minus 15 DEG C and shell layer glass state temperature Tg to be 5 to 40 DEG C, and after polymerization of the emulsion and regulating pH to be 8 to 9, adding a certain amount of cross-linking agent, and obtaining the room temperature self-crosslinking elastic emulsion of core-shell structure. The elastic emulsion prepared by the invention can be self-crosslinked at room temperature, and has excellent low-temperature elasticity, scratch resistance, anti-contamination and surface finish, and can meet the requirements of actual application.

Description

technical field [0001] The invention relates to the field of polymer synthesis, in particular to a full acrylate elastic emulsion. Background technique [0002] With the increasing use of architectural latex paint on building exterior walls, especially the mandatory use of the country's external wall insulation system in the north. In the process of using ordinary latex paint for maintenance and decoration, it is often found that due to the poor elasticity of the latex paint itself, the cracking of the base layer will cause the coating to crack and peel off in pieces, resulting in the failure of the entire coating system. There have been too many cases of this kind of problem in the past few years. It is difficult to solve the problem of poor elasticity even if the silicone acrylic emulsion with better comprehensive performance is used. This defect of latex paint film can be overcome by choosing a suitable elastic paint. The key technology of elastic coatings lies in the e...

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Problems solved by technology

CN1557850A grafts silicone resin on acrylate macromolecules through copolymerization reaction, which greatly improves water resistance and weather resistance, but does not greatly improve the flexibility and low temperature crack resistance of emulsion

CN101885889A adopts the core-shell emulsion polymerization method, by adding a photocuring agent, the emulsion is cured and cross-linked by light during film formation, and the outermost layer becomes hard, which improves its anti-fouling property, but the ultraviolet radiation is uneven in nature Generally speaking, the north side of the building is seldom able to receive ultraviolet radiation, so the curing speed of the paint on the north wall of the building is slow, which may cause "sagging" phenomenon, which affects its use.

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