Anti-ultraviolet nanometer polyurethane wood surface coating and preparation method thereof

Abstract

The invention belongs to the field of nanometer materials, and specifically provides an anti-ultraviolet nanometer polyurethane wood surface coating and a preparation method thereof. The coating comprises the following components with contents in parts by weight: 100 parts of polyurethane resin, 15 to 20 parts of a nanocomposite mother liquor, 6 to 8 parts of a composite corrosion inhibitor, 0.5 to 1.0 part of an organic corrosion inhibitor, 1 to 3 parts of an anti-ultraviolet pigment, 1 to 3 parts of a flame-retardant filler, 6 to 8 parts of isocyanate and 5 to 10 parts of an organic solvent.The preparation method comprises the following steps: weighing the polyurethane resin, the nanocomposite mother liquor, the composite corrosion inhibitor, the organic corrosion inhibitor, the anti-ultraviolet pigment, the flame-retardant filler, the isocyanate and the organic solvent, carrying out mixing in proportion, carrying out dispersion, and carrying out grinding until a particle size is 100 nm or below so as to prepare the anti-ultraviolet nanometer polyurethane wood surface coating. The coating provided by the invention has rapid drying speed and high strength and toughness, has shielding effect to electromagnetic wave, is insusceptible to aging, and can meet the requirements of flame retardancy, ultraviolet resistance and aging resistance.

Description

technical field [0001] The invention belongs to the field of nanometer materials, in particular to an anti-ultraviolet nanometer polyurethane wood surface coating and a preparation method thereof. Background technique [0002] Wood products include solid wood and wood-based panels (plywood, medium density fiberboard and particle board). Coatings used for supplies, stationery, toys, etc. are mainly furniture coatings. Wood coatings are divided into two categories according to the wood manufacturing process, plate pre-coating and finished wood coating coatings, and are divided into solvent-based coatings, water-based coatings and solvent-free coatings according to coating types. [0003] Polyurethane wood lacquer is a relatively common type of coating at present, which can be divided into two-component polyurethane coatings and one-component polyurethane coatings. Two-component polyurethane topcoat paint is generally composed of isocyanate prepolymers (also known as low mole...

AI Technical Summary

Problems solved by technology

At room temperature, the final hardness cannot be reached within many days, and the products are easy to stick when stacked, which cannot meet the requirements of industrial high-quality and high-efficiency coating

The heat of evaporation of water is relatively high, and in high and low temperature environments, the drying of water-based coatings is slower, and it is particularly prone to construction problems such as whitening, cracking, mirror frames, and uneven gloss; (2) general-purpose polyurethane resin Poor mechanical properties, low strength, and poor toughness; easy to crack after curing, and has no shielding effect on electromagnetic waves, and is easy to age under ultraviolet light

Although the existing toughening modification methods improve the toughness of polyurethane resin to a certain extent, they damage other excellent properties of the resin, such as reducing the strength and wear resistance of the resin.

(3) poor flame retardant effect

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