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Solvent-free polyurethane finishing coat

A solvent-free polyurethane and topcoat technology, applied in the field of polyurethane topcoat, can solve the problems of hardness, abrasion resistance, solvent resistance, insufficient cost, environmental and human pollution, flammability, etc., and achieve improved crosslinking density and toughness High degree, high gloss, good pre-reflection effect

Inactive Publication Date: 2017-11-24
天津市津海特种涂料装饰有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although solvent-based polyurethane coatings have excellent performance, they contain a large amount of volatile organic compounds (VOCs), which are flammable and cause great pollution to the environment and the human body. Although water-based polyurethane coatings do not contain VOCs, their hardness, wear resistance leaves a lot to be desired in terms of performance, solvent resistance and cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Component A:

[0025] Glycidyl methacrylate, allyl glycidyl ether, and γ-(2,3-epoxypropoxy)propyltrimethoxysilane are mixed at a ratio of 1:1:1, and a monovalent secondary amine is added to obtain a pre-prepared hydroxyl epoxy resin. Polymer, 65 parts of hydroxyl epoxy resin, 10 parts of aluminum tripolyphosphate, 10 parts of filler mixed with talc powder and sericite according to 3:2, 2 parts of defoamer BYK-035, 3 parts of dispersant BYK-165, fluid Leveling agent BYK-301 1 part, high-speed shearing and mixing to obtain component A;

[0026] Component B: The polyisocyanate uses the hexamethylene diisocyanate;

[0027] Before use, mix component A and component B according to 5:1 and stir for 5 minutes, then start spraying.

[0028] Construction temperature 5-40℃

[0029] Spray thickness 300μm

[0030] Surface dry time 4h, dry time 48h

[0031] Bending properties ( 10mm, bending) no cracking, no peeling

[0032] Impact resistance (drop hammer height 100cm) paint ...

Embodiment 2

[0034] Component A:

[0035] Glycidyl methacrylate, allyl glycidyl ether, and γ-(2,3-epoxypropoxy)propyltrimethoxysilane are mixed at a ratio of 1:1:1, and a monovalent secondary amine is added to obtain a pre-prepared hydroxyl epoxy resin. Polymer, 80 parts of hydroxyl epoxy resin, 10 parts of aluminum tripolyphosphate, 10 parts of filler mixed with talc powder and sericite according to 3:2, 2 parts of defoamer BYK-034, 3 parts of dispersant BYK-163, fluid Leveling agent BYK-300 1 part, high-speed shearing and mixing to obtain component A;

[0036] Component B: The polyisocyanate uses the hexamethylene diisocyanate;

[0037] Before use, mix component A and component B according to 5:1 and stir for 5 minutes, then start spraying.

[0038] Construction temperature 5-40℃

[0039] Spray thickness 300μm

[0040] Surface dry time 4h, dry time 48h

[0041] Bending properties ( 10mm, bending) no cracking, no peeling

[0042] Impact resistance (drop hammer height 100cm) paint ...

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PUM

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Abstract

The invention discloses a solvent-free polyurethane finishing coat. The solvent-free polyurethane finishing coat is characterized by comprising the substances in parts by weight: components A, namely 60-80 parts of hydroxy epoxy resin, 10-15 parts of a pigment, 10-15 parts of filler, 1-5 parts of a defoaming agent, 1-5 parts of a dispersing agent and 1-5 parts of a flatting agent, and component B, namely polyisocyanate, wherein the components A and the component B are mixed evenly at the ratio of (5-10):1. According to the high-NCO content solvent-free isocyanate-terminated prepolymer of a low-residue isocyanate monomer, the crosslinking density and the toughness of a coating are improved while the low-temperature drying speed of a film is ensured, thereby providing the film with excellent wear resistance, impact resistance, corrosion resistance and scratch resistance.

Description

technical field [0001] The invention relates to the field of polyurethane topcoat, in particular to a solvent-free polyurethane topcoat. Background technique [0002] Due to its good performance, polyurethane coatings have been widely used in wood coatings, architectural coatings, automotive coatings, etc. Although solvent-based polyurethane coatings have excellent performance, they contain a large amount of volatile organic compounds (VOCs), which are flammable and cause great pollution to the environment and the human body. Although water-based polyurethane coatings do not contain VOCs, their hardness, wear resistance There are many deficiencies in performance, solvent resistance and cost. The object of the present invention is to provide a solvent-free polyurethane topcoat that can be cured at low temperature, does not contain volatile organic compounds, has low residual isocyanate monomer content, and can improve coating performance. Contents of the invention [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/04C09D5/08C09D7/12
CPCC09D175/04C08K2003/327C08K2201/014C09D5/08C08K3/32C08K3/34
Inventor 刘国海武学华
Owner 天津市津海特种涂料装饰有限公司
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