Aqucous polyurethane modified from vinyl resin possessing structure of bisphenol A and its preparing process

Abstract

The present invention relates to a vinyl resin modified water polyurethane with bisphenol A structure and its preparation method. It is characterized by that its raw materal includes polyurethane resin with hydrophilicity and terminated bouble-bond, vinyl resin with bisphenol A structure and free radical polymerization initiator, and it is made up by adopting the following processes; fully mixing the above-mentioned two resins, dispersing distilled water to form uniform emulsion, drop-adding initiator to make polymerization reaction so as to obtain the invented product.

Description

Technical field: [0001] The invention relates to the technology of modifying waterborne polyurethane with epoxy resin. Background technique: [0002] Waterborne polyurethane is a new type of polyurethane system that uses water instead of organic solvents as the dispersion medium, and can be widely used in coatings, adhesives, leather finishing agents, fabric finishing agents, etc. Due to the existence of hydrophilic groups in polyurethane macromolecules and some shortcomings of the resin itself, it has some shortcomings in water resistance, solvent resistance, weather resistance, etc., which affects this type of products to a certain extent. range of use. Epoxy resin is often used in the modification of polyurethane materials due to its excellent properties such as good adhesion, chemical corrosion resistance, and high strength. However, due to the β-C in the epoxy group being affected by triethylamine, hydroxyl, water, etc. Nucleophilic reagents, oxygen atoms are attacked...

AI Technical Summary

Problems solved by technology

Due to the existence of hydrophilic groups in polyurethane macromolecules and some shortcomings of the resin itself, it has some shortcomings in water resistance, solvent resistance, weather resistance, etc., which affects this type of products to a certain extent. scope of use

Epoxy resin is often used in the modification of polyurethane materials due to its excellent properties such as good adhesion, chemical corrosion resistance, and high strength. However, due to the β-C in the epoxy group being affected by triethylamine, hydroxyl, water, etc. Nucleophilic reagents, oxygen atoms are attacked by protons or Lewis acid electrophiles to undergo a ring-opening reaction, resulting in poor storage stability of the emulsion, so the direct use of epoxy resin modified waterborne polyurethane resin is largely limited