Cross-linkable and re-dispersible polymer powder with high adhesive property

Abstract

The invention provides cross-linkable and re-dispersible polymer powder with high adhesive property as well as a preparation method and use of the polymer powder. The polymer powder is prepared from a single olefinic bond unsaturated monomer unit with hydroxymethyl or carbonyl, a single olefinic bond unsaturated monomer unit with carboxyl and hydroxyl, an unsaturated monomer unit formed by a (methyl) alkyl acrylate and vinyl aromatic compound of non-branched or branched alcohol with 1-15 carbon atoms, and water-soluble polymer protective colloid. The polymer powder disclosed by the invention has excellent self-adhesive performance and substrate bonding performance; the polymer powder and the aqueous dispersion thereof can be subjected to cross-linking reaction in the constructing and drying processes by virtue of the foundational groups such as hydroxymethyl, carbonyl, carboxyl, hydroxyl and the like, so as to achieve excellent self-adhesive performance and substrate bonding performance.

Description

technical field [0001] The invention relates to a crosslinkable redispersible polymer powder with high binding performance, as well as its preparation method and application. Background technique [0002] The polymer aqueous dispersion is spray-dried to quickly remove the water in the system, and the obtained polymer powder with good fluidity is called redispersible polymer powder or latex powder. Under the action of water and mechanical energy, this powder can be redispersed in water and maintain the performance equivalent to the original dispersion. [0003] Redispersible polymer powder is mainly used as an additive for concrete, cement mortar and other building materials. It can be used together with cement and other inorganic binders, which can significantly improve the flexural strength of the material. It can also be used as the main film-forming adhesive in powder coatings. Knot use. Especially in the polymer modification of hydraulic cement, the trend of using redi...

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Problems solved by technology

[0004] However, since the production of redispersible polymer powder has to go through multiple processes such as emulsion polymerization, spray drying and redispersion of rubber powder, the bonding ability of the polymer components will decrease to varying degrees.

For concrete and cement mortar systems, this decline can be compensated by the bonding ability of inorganic binders and the hydration process of cement; while for systems where polymers such as dry powder coatings serve as the main binder, the reduction can be remedied. A reduction in the cohesive ability of the dispersed polymer powder can seriously affect the mechanical strength of the final coating film

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