High-hardness nano-PU(nano-polyurethane) coating for woodware surfaces and preparation method of coating

Abstract

The invention belongs to the field of nano materials and particularly provides a high-hardness nano-PU (nano-polyurethane) coating for woodware surfaces and a preparation method of the coating. The coating is prepared from components in parts by weight as follows: 80-90 parts of PU resin, 10-20 parts of unsaturated polyester resin, 15-20 parts of a nano-composite mother solution, 6-8 parts of a compound corrosion inhibitor, 0.5-1.0 part of an organic corrosion inhibitor, 1-3 parts of an initiator, 1-3 parts of flame-retardant filler, 6-8 parts of isocyanate and 5-10 parts of an organic solvent. The PU resin, the unsaturated polyester resin, the nano-composite mother solution, the compound corrosion inhibitor, the organic corrosion inhibitor, the initiator, the flame-retardant filler, isocyanate and the organic solvent are mixed proportionally, dispersed and ground into particles with size being 100 nm or lower, and the high-hardness nano-PU coating for the woodware surfaces is prepared. The coating is high in drying speed, strength and toughness, has a shielding effect on electromagnetic waves and a flame-retardant function and is not prone to aging, and hardness is further improved.

Description

technical field [0001] The invention belongs to the field of nano-materials, in particular to a high-hardness nano-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 molecular carbamat...

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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