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A kind of pipe anti-scratch polyurethane coating and preparation method thereof

A technology of polyurethane coatings and pipes, which is applied in the field of polyester coatings, can solve the problems that cannot meet the requirements of pipeline scratch resistance coatings, impact resistance, poor adhesion, rusty steel plates, etc., and achieve stability over time and salt spray resistance The effect of good performance and excellent wear resistance

Active Publication Date: 2018-03-30
NIPPON PAINT TIANJIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Coil coatings in the prior art, such as anti-scratch coatings for rolling shutter doors and windows, coatings for door and window frames, etc., have good wear resistance and friction resistance, but poor impact resistance and adhesion, which can easily cause steel plates to rust, and cannot meet the requirements of pipelines. Scratch Resistant Coating Requirements

Method used

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  • A kind of pipe anti-scratch polyurethane coating and preparation method thereof
  • A kind of pipe anti-scratch polyurethane coating and preparation method thereof
  • A kind of pipe anti-scratch polyurethane coating and preparation method thereof

Examples

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Effect test

Embodiment 1

[0060] A preparation method for pipeline anti-scratch polyurethane coating, comprising the following steps:

[0061] 1) Mix 25-30 parts of polyester resin, 1-3 parts of dispersant, 20-35 parts of coloring pigment, and 0.1-1 part of anti-sedimentation additive, add 4-10 parts of solvent, and grind to obtain slurry;

[0062] 2) Add 15-20 parts of polyester resin and 8-13 parts of amino resin to the slurry, mix; add 10-20 parts of isocyanate, add 0.2-1.5 parts of wax additive, 0.2-0.3 parts of acid catalyst, organic tin 1-2 parts of catalyst, 0.5-1.5 parts of defoamer, 1-3 parts of sand flour (polymethyl methacrylate, commercially available, such as produced by Dongguan Longhai Chemical Co., Ltd., model 3678), to obtain scratch-resistant polyurethane for pipes coating.

[0063] The solid percentage of polyester resin is 60-70%, the solid percentage of amino resin is 70-100%, the solid percentage of isocyanate is 70-90%; the ratio of polyester amino group is 2-5, and the ratio of...

Embodiment 2

[0069] A preparation method for pipeline anti-scratch polyurethane coating, comprising the following steps:

[0070] 1) Mix and grind 25 parts of polyester resin, 2 parts of dispersant, 22 parts of coloring pigment, 0.1-1 part of anti-sedimentation aid, and 4-10 parts of solvent to obtain slurry;

[0071] 2) Add 15 parts of polyester resin, 12 parts of amino resin, 18 parts of isocyanate, 0.2 parts of wax additive, 1.5 parts of sand flour, 0.2-0.3 parts of acid catalyst, 1-2 parts of organotin catalyst, disinfectant Mix 0.5-1.5 parts of foaming agent and 0-5 parts of solvent to obtain scratch-resistant polyurethane coating for pipes; wherein, the sand flour is polymethyl methacrylate, the particle size of the sand flour is 40 μm, and the specific gravity is 1.7 g / ml .

[0072] The polyester resin solid content is 60%, the amino resin solid content is 70%, and the isocyanate solid content is 70%; the polyester amino ratio is 2.9, the polyester isocyanate ratio is 1.9, the pigm...

Embodiment 3

[0075] A preparation method for pipeline anti-scratch polyurethane coating, comprising the following steps:

[0076] 1) Mix and grind 30 parts of polyester resin, 2 parts of dispersant, 35 parts of coloring pigment, 0.1-1 part of anti-sedimentation aid, and 4-10 parts of solvent to obtain slurry;

[0077] 2) Add 20 parts of polyester resin, 10 parts of amino resin, 12 parts of isocyanate, 0.2 parts of wax additives, 1.5 parts of sand flour (polymethyl methacrylate, the particle size of sand flour is 30 μm, and the specific gravity is 1.5g / ml), 0.2-0.3 parts of acid catalyst, 1-2 parts of organic tin catalyst, 0.5-1.5 parts of defoamer, 0-5 parts of solvent, and mix to obtain scratch-resistant polyurethane coating for pipes;

[0078] The polyester resin solid content is 60%, the amino resin solid content is 70%, and the isocyanate solid content is 70%; the polyester amino ratio is 4.3, the polyester isocyanate ratio is 3.6, the pigment-base ratio is 0.8, and the sand-color rati...

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Abstract

The invention discloses an anti-scratch polyurethane coating for pipelines. The raw material of the anti-scratch polyurethane coating for pipelines includes sand flour; the sand flour is selected from polyethylene, polytetrafluoroethylene, polypropylene, polymethacrylate, nylon 6, Nylon 12 or polymethyl methacrylate; the particle size of the sand flour is 30-50 μm, and the specific gravity is 1.5-1.8 g / ml. The T-bend of the coating of the present invention can reach 0T without peeling off; it can withstand MEK wiping for more than 100 times, and it can withstand salt spray for 1500 hours without exception; it has good aging resistance, QUVA for 1500 hours, and its gloss retention rate is ≥ 70%; drop particle phenomenon. The invention also discloses a preparation method of the paint. The minimum film-forming temperature of the anti-scratch polyurethane paint for pipes obtained by the method is 200 DEG C. Sand flour is added in this method, and under the same conditions, the gloss of the coating obtained is about 10° lower than that without adding sand flour.

Description

technical field [0001] The invention relates to the technical field of polyester coatings. More specifically, it relates to a pipe scratch-resistant polyurethane coating and a preparation method thereof. Background technique [0002] In a cold environment (low temperature condition), plastic pipes are easy to break; in a hot environment (high temperature condition), plastic pipes are prone to aging, which limits the application of plastic pipes in industry. Therefore, color plate metal pipes with cheap price, strong acid and alkali resistance, wear resistance and scratch resistance are becoming more and more popular. According to incomplete statistics, the annual consumption of coatings on metal pipes in Russia exceeds 10,000 tons. [0003] Coil coatings include coil steel coatings and coil aluminum coatings. They are special coatings that are applied to metal plates to protect and decorate them. They are applied to steel plates and aluminum by roller coating. surface, an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D175/06C09D7/65C08G18/42C08G18/54
Inventor 黄雨花于东澳
Owner NIPPON PAINT TIANJIN
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