Synthesis process of waterborne polyurethane

Abstract

The invention belongs to the technical field of high molecular materials, and particularly relates to a synthesis process of waterborne polyurethane. The synthesis process includes following steps: step 1, adding a catalyst and a solvent into a mixed system of polyol, isophorone diisocyanate and 1, 1, 2, 2-tetraphenylglycol for reaction; step 2, after glycol and carboxymethyl chitosan are mixed well, adding into a mixture obtained in the step 1, and allowing reaction at 78-83 DEG C; step 3, adding a triethylamine-dichloromethane complex into a mixed system obtained in the step 2, and maintaining for 0.5h; step 4, adding the mixed system obtained in the step 3 into a water-diglycol mixed solution, and continuing to stir to obtain a waterborne polyurethane solution. High-stability waterbornepolyurethane is prepared under mild reaction conditions by introducing 1, 1, 2, 2-tetrapheneylglycol into raw materials and adding carboxymethyl chitosan into the step 2, few organic solvents are adopted in the process of reaction, and pollution is little.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, in particular to a synthesis process of water-based polyurethane. Background technique [0002] Water-based polyurethane is a new type of polyurethane system that uses water instead of organic solvents as the dispersion medium, also known as water-dispersed polyurethane, water-based polyurethane or water-based polyurethane. Water-based polyurethane uses water as a solvent, and has the advantages of no pollution, safety and reliability, excellent mechanical properties, good compatibility, and easy modification. [0003] Chinese patent CN201410626838.1 discloses a water-based polyurethane synthesis process. In this method, primary amines or secondary amines are polymerized with ethylene oxide, neutralized by adding protonic acid, and then diisocyanate or polyisocyanate is dropped into the reaction to synthesize Polyurethane prepolymer, and finally disperse the polyurethane prepolymer int...

AI Technical Summary

Problems solved by technology

The method not only overcomes the disadvantages of acetone method and other processes that consume a large amount of organic solvents and wastes energy, but also overcomes the limitation of raw materials in the prepolymer mixing method, does not require complicated equipment, and has simple and easy reaction steps; but the polyurethane water The stability of the dispersion is not high, and it is easy to separate