Acrylic ester organic silicon composite modified polyether polyurethane aqueous dispersion and preparation method thereof

Abstract

The invention relates to an aqueous dispersion of acrylate silicone composite modified polyether polyurethane and its preparation. The aqueous dispersion volatilizes and forms a film after drying. The solid content accounts for 25-35%, and the water accounts for 65-75%. 5-16.60% of acrylate monomer, 82.03-91.02% of polyether polyurethane prepolymer, 0.1-1.0% of silicone monomer containing unsaturated double bonds, 0.1-1.0% of chain transfer agent and 0.50% of oil-soluble initiator ~2.5% emulsion copolymerization, when the emulsion copolymerization, the initiator is added in three steps, the addition amount is one more and one less, the polyether polyurethane prepolymer is an amphoteric polymer, and the equivalent ratio of -NCO / -OH is 1.2-2.0 polyisocyanate, carboxyl-containing polyols and polyether polyols are heated and copolymerized, and then capped with acrylate hydroxyl esters until -NCO is zero. %, emulsified with water. After the water dispersion of the invention is formed into a film, the paint film has good water resistance and good mechanical properties.

Description

technical field [0001] The invention relates to an acrylate organosilicon composite modified polyether polyurethane aqueous dispersion and its preparation. Background technique [0002] Polyurethane resins are widely used in various fields due to their excellent properties such as abrasion resistance, flexibility, and chemical resistance. However, with the determination of environmental protection regulations in various countries and the enhancement of environmental protection awareness, in the traditional solvent-based polyurethane system, the emission of volatile organic compounds (VOC) and the toxicity of free isocyanate in isocyanate limit its application, while water-based polyurethane dispersion Because of its flame retardant, non-toxic, non-polluting, easy storage and transportation, and convenient use, it is attracting more and more attention. When water-based polyurethane dispersion is used as a film-forming resin, the water resistance after film formation is an im...

AI Technical Summary

Problems solved by technology

In EP072239A1, although an oil-soluble initiator is used to initiate the polymerization, the defect of using a water-soluble initiator is avoided, but because the amount of the initiator is too low, the molecular weight after the copolymerization is too small (less than 10000) due to one-step polymerization, so it can only be introduced by introducing Cross-linking agent to improve the performance after film formation, this two-component system brings a lot of inconvenience to use