Process for synthesizing waterborne polyurethane

Abstract

The invention discloses a process for synthesizing waterborne polyurethane. The process comprises the steps of firstly, subjecting primary amine or di-sec-amine to a polymerization reaction with epoxyethane, carrying out neutralization by adding protonic acid, carrying out a reaction by dropwise adding diisocyanate or polyisocyanate so as to synthesize a polyurethane prepolymer, finally, dispersing the polyurethane prepolymer into a mixed dispersion solution of water and a hydrophobic polyhydroxylated compound or hydrophobic poly-amido compound, and carrying out intense stirring, thereby preparing an aqueous dispersion solution of polyurethane. According to the process, the disadvantages of processes such as an acetone method that a large volume of organic solvents are consumed, energy sources are wasted, and the like are overcome, the restriction to raw materials caused by a prepolymer mixing method is also overcome, complicated equipment is not required, reaction operating steps are easy and feasible, the product quality is guaranteed, and national conditions are met.

Description

technical field [0001] The invention belongs to the technical field of chemical synthesis, and in particular relates to a water-based polyurethane synthesis process. 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. The water-based polyurethane resin has gradually replaced the solvent-based and has become an important direction for the development of the polyurethane industry. In the current synthetic process of water-based polyurethane, the process is not easy to implement, the purity of the finished product is low, the single-pass conversion rate of reactants is low, the produc...

AI Technical Summary

Problems solved by technology

In the current synthetic process of water-based polyurethane, the process is not easy to implement, the purity of the finished product is low, the single-pass conversion rate of the reactant is low, the production process is complicated, the production efficiency is low and the cost is high, and it is not suitable for large-scale production.