Polyurethane-polyacrylacid ester interpenetrating network polymer, preparation and use thereof

Abstract

The invention relates to a polyurethane-polyacrylic ester interpenetrating network polymer and a preparation method and the application thereof. The following steps are comprised: self-emulsifying anionic polyurethane water dispersoid containing carbon-carbon double bonds are synthesized through a step addition polymerization method; the synthesized polyurethane water dispersoid is used as seeding emulsion and polymer surface active agent; in-situ emulsion polymerization is carried out on acrylic ester monomer in an emulsification system by using dropwise adding evocating agents, so that the pre-emulsifying acrylic monomers in the system can be polymerized and (or) cross-linked on the inner part and the surface of seeding emulsion particles, and then the polyurethane-polyacrylic ester interpenetrating network polymer emulsion can be obtained; after dried, emulsion powder which has good water resisting property and cohesiveness when re-dispersed in water is obtained; the polyurethane-polyacrylic ester interpenetrating network polymer not only can be used with inorganic cementing materials such as cement, white lime or plaster for manufacturing overcoating mortar, pointing-joint agents, plastering agents and building bonding agents, but also can be independently used as film forming binder for preparing dry powder emulsion coating.

Description

technical field [0001] The invention relates to a redispersible polymer and a preparation method thereof, more specifically, to a redispersible polyurethane-polyacrylate interpenetrating network polymer, a preparation method and application thereof. Background technique [0002] Redispersible polymer latex powder has been widely used in various fields such as powder coatings, adhesives, and building materials. In the field of building materials, such as external insulation mortar, tile adhesive, putty, self-leveling mortar, concrete repair, thin layer bonding / repair mortar, plastering mortar and other special fields, redispersed polymer latex powder is used to improve the above-mentioned The performance of building materials, such as adding redispersible polymer latex powder to cement-based or gypsum-based dry-mixed mortar can improve various properties of mortar, such as improving the cohesive force of materials, reducing water absorption of materials, and strengthening mat...

AI Technical Summary

Problems solved by technology

But because these redispersible polymer latex powders have adopted a large amount of surfactants when emulsion synthesis, and all adopt water-soluble polyvinyl alcohol as protective colloid when drying, thus gained rubber powder contains polyvinyl alcohol and at least one Surfactant, so the water resistance is poor, and the bond strength needs to be improved

[0005] In short, judging from the current domestic and foreign realities, redispersible polymer latex powder products are relatively single, and there are many homogeneous products. There are still many areas that need to be improved in terms of water resistance and bonding performance after redispersing in water. , can not be used alone as a film-forming combination to prepare dry powder latex coatings with excellent performance

The synthesis of high-performance polyurethane-polyacrylate interpenetrating network polymer emulsion and the preparation of latex powder that can be used in dry latex coatings have not been reported at home and abroad.