Aqueous double-component polyurethane varnish and preparation method of aqueous double-component polyurethane varnish

Abstract

The invention discloses an aqueous double-component polyurethane varnish and a preparation method of the aqueous double-component polyurethane varnish. The raw material formula of the aqueous double-component polyurethane varnish is composed of a component 1 and a component 2, wherein the component 1 comprises the following components: 55-65% of hydroxy polyurethane dispersion, 15-18% of water, 0.2-0.5% of acetobutyryl cellulose flatting agent, 0.5-0.8% of flowing deformation auxiliary agent, 0.5-0.8% of nano silica particle, 0.1-0.3% of defoamer, 0.3-0.5% of defoaming agent, 0.1-0.3% of thickener, 0.4-0.6% of film-forming auxiliary agent, 0.2-0.5% of aqueous drier and 0.5-1.5% of teflon wax; and the component 2 comprises 15-20% of polyisocyanate and 1-3% of degassing solvent. The aqueous double-component polyurethane varnish has the characteristics of fast drying speed and good leveling property, is not easy to generate bubbles, is easy to store, and can endow a varnish film with high hardness and high anti-scratching property.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to water-based wood coatings, in particular to a water-based two-component polyurethane varnish and a preparation method thereof. Background technique [0002] The rise and development of polymerization science has advanced the coating science and coating industry to a new modern coating stage. However, these synthetic resin coatings use a large amount of organic solvents in the production and coating process to adjust the viscosity, improve the construction process and construction performance, and cause a large amount of organic solvents to volatilize into the air, causing serious environmental pollution and ecological damage. The production, processing and use of coatings have become one of the main sources of industrial pollution. [0003] Therefore, the widely used solvent-based organic coatings are products that are difficult to meet environmental protection requirements, an...

AI Technical Summary

Problems solved by technology

[0006] However, there are still some problems in water-based polyurethane, such as the construction limitations caused by the seasonal climate caused by the drying time of the paint, the bubbles in the paint are easy to affect the surface effect of the paint, the hardness and scratch resistance of the paint film need to be improved, etc.