Multiple crosslinking ultraviolet light solidifying water polyurethane dispersoid and its preparation method and application

Abstract

The invention discloses a multiple crosslink ultraviolet solidification aqueous polyurethane disperser, a relative preparation method and an application. The preparation method comprises synthesizing polyurethane initial polymerized compound I, synthesizing polyurethane prepolymer II, synthesizing polyurethane prepolymer III, synthesizing polyurethane acrylate oligomer and synthesizing ultraviolet solidification aqueous polyurethane disperser. The invention mainly utilizes aromatic diisocyanate, diatomic alcohol prepolymer, polyhydroxy carboxylic acid, epoxy resin and hydroxyl acrylate as raw materials, with better water dispersity and storage stability, which leads in light inducer, levelling agent, defoaming agent and thickener to prepare ultraviolet solidification aqueous wood paint better than solvent ultraviolet solidification photosensitive resin, with stable storage, low fineness, high rigidity, high brightness, better flow leveling property, better water resistance, better solvent resistance, excellent abrasion resistance, environment protection, easy process and fire hazard resistance.

Description

technical field [0001] The present invention relates to a new type of coating: water-based polyurethane wood coating, in particular to a method for preparing a green and environment-friendly multi-crosslinked UV-curable water-based polyurethane dispersion, and the UV-curable water-based polyurethane wood coating prepared from this dispersion. coating. Background technique [0002] With the progress of society and the improvement of human awareness, people have gradually realized the high hazards of solvent-based coatings, that is, the discharge of a large number of volatile organic compounds will damage the earth's ecological environment and the heavy metals used in coatings will affect the further development of human beings. the threat posed. [0003] The formulation system of solvent-based UV-curable coatings usually consists of photoinitiators, reactive oligomers, reactive diluent monomers and organic solvents to adjust the viscosity of the formulation. Although the re...

AI Technical Summary

Problems solved by technology

Although the reactive diluent monomer is used in a small amount, has low volatility, has little environmental pollution, and becomes a part of the coating film after curing, it has a strong odor and is irritating to the skin. The diluent is completely cured, and the residual reactive diluent monomer will have a negative impact on the safety, sanitation and long-term performance of the product, and the reactive diluent will increase the shrinkage of the coating film and reduce the physical properties of the coating film

Traditional solvent-based UV-curable coatings have to add some solvents, active monomers or multifunctional acrylates to adjust the viscosity of the coatings during production, construction and use, resulting in organic volatiles that are harmful to the environment and humans.