Hydroxyl type water-borne cationic polyurethane-acrylic acid resin and preparation method thereof

Abstract

The invention provides a preparation method of hydroxyl type water-borne cationic polyurethane-acrylic acid resin. The method comprises the following steps that 1, hydroxyl telechelic polyester containing an unsaturated double bond is obtained through a reaction; 2, a product obtained in the first step serves as the raw material, dihydric alcohol, isocyanate, a hydrophilic monomer, a catalyst, an end-capped reagent, neutralizer and the like are added according to the ratio of a designed formula, and the unsaturated water-borne cationic polyurethane is obtained; 3, a product obtained in the second step serves as the raw material to be reacted with an acrylate monomer according to the ratio of a designed formula, and the hydroxyl type water-borne cationic polyurethane-acrylic acid resin is obtained. The end-capped reagent is added in the second step, double bond monomer end-capping is conducted on a water-borne cationic polyurethane resin prepolymer, and the grafting rate of acrylic acid resin is further increased; the reaction condition is mild, water-borne cationic polyurethane-hydroxyl type acrylic acid resin with improved performance is obtained without adding emulsifier, and the application field of the resin is greatly enlarged.

Description

Technical field: [0001] The invention relates to the field of resins, in particular to a preparation method of hydroxyl-type water-based cationic polyurethane-acrylic resin. Background technique: [0002] Water-based polyurethane can be divided into ionic and non-ionic according to whether the dispersed particles are charged, and ionic water-based polyurethane can be divided into anionic, cationic and zwitterionic according to the charging properties of the polyurethane main chain. There are many applications of polyurethane, because the process of quaternizing the prepolymer in the preparation process of quaternary ammonium cationic water-based polyurethane is more complicated, the cost is higher, and the prepared cationic products are sometimes unstable in storage; compared with anionic At present, there are few research reports on cationic type water-based polyurethane. At the same time, water-based cationic polyurethane has disadvantages such as poor water resistance, lo...

AI Technical Summary

Problems solved by technology

[0002] Water-based polyurethane can be divided into ionic and non-ionic according to whether the dispersed particles are charged, and ionic water-based polyurethane can be divided into anionic, cationic and zwitterionic according to the charging properties of the polyurethane main chain. There are many applications of polyurethane, because the process of quaternizing the prepolymer in the preparation process of quaternary ammonium cationic water-based polyurethane is more complicated, the cost is higher, and the prepared cationic products are sometimes unstable in storage; compared with anionic At present, there are few research reports on cationic type water-based polyurethane. At the same time, water-based cationic polyurethane has disadvantages such as poor water resistance, low gloss, poor solvent resistance, and slow drying speed; but because the molecular chain of cationic water-based polyurethane has positive charges, its It has good wettability to hydrophobic polyester and fabric fibers, and is not sensitive to water hardness, and can be used under acidic conditions, so it has broad application prospects in the fields of textiles, leather, wood coatings, and papermaking; water-based Hydroxy acrylic resin has the advantages of high mechanical strength, aging resistance, good weather resistance and good water resistance, but it also has the disadvantage of hot stickiness and cold brittleness; modifying water-based cationic polyurethane with hydroxy acrylate can maximize the strengths and avoid weaknesses. A water-based cationic polyurethane-hydroxyacrylic resin with improved performance is obtained; and the resin is conveniently compounded with amino resin to prepare water-based cationic amino baking varnish; it can also be compounded with water-based polyisocyanate curing agent to prepare normal temperature self-drying water-based cationic polyurethane double-pack The compounded resin can significantly improve its hardness, water resistance, impact resistance and other properties, which greatly expands the application field of cationic resin

[0003] At the same time, traditional solvent-based cationic polyurethane-acrylic resins use acetone or methyl ethyl ketone method. The use of organic solvents needs to be removed by distillation, which is cumbersome. pollution