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Single-component wet gas curing polyurethane heavy-duty anticorrosion coating and preparation method thereof

A moisture-curing, heavy-duty anti-corrosion technology, applied in polyurea/polyurethane coatings, anti-corrosion coatings, coatings, etc., can solve the problem of high volatility, achieve fast curing film formation, good storage stability, and high surface hardness.

Active Publication Date: 2019-07-26
SWD HIGH TECH MATERIALS JIANGSU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The toxicity of xylene to the human nervous system is well known, and its LD 50 It is 1364mg / kg, highly volatile, and has the danger of explosion, so it should be restricted from the perspective of environmental protection and safety

Method used

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  • Single-component wet gas curing polyurethane heavy-duty anticorrosion coating and preparation method thereof
  • Single-component wet gas curing polyurethane heavy-duty anticorrosion coating and preparation method thereof
  • Single-component wet gas curing polyurethane heavy-duty anticorrosion coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Preparation of Modified Polyurethane Prepolymer Resin

[0057] S1: Put 2.5kg of polyisocyanate MDI and 2.0kg of solvent sec-butyl acetate in a reaction vessel, heat up to 45°C, stir for 1 hour, and form material 1;

[0058] S2: Add 1.2kg of polyether polyol PPG, 0.55kg of natural castor oil with hydroxyl value OH=163mg KOH / g, 0.5kg of amino-terminated polyether D-2000, 0.1kg of acrylate-polyethylene glycol-amino and 2kg of acetic acid The sec-butyl ester was placed in a reaction vessel and stirred at room temperature for 1 h to form material 2;

[0059] S3: Add 2 g of the catalyst stannous octoate to material 1 under stirring at 45°C, slowly add material 2 dropwise to material 1 for 2 hours, raise the temperature to 85°C after the addition is completed, keep the temperature for 2.5 hours, and prepare A modified polyurethane prepolymer resin is obtained.

Embodiment 2

[0061] Preparation of Modified Polyurethane Prepolymer Resin

[0062] S1: In parts by weight, 5 parts of polyisocyanate compound MDI, 20 parts of PAPI and 20 parts of solvent sec-butyl acetate were placed in a reaction vessel, the temperature was raised to 45° C., and stirred for 1 hour to form material 1;

[0063] S2: Put 12 parts of polyether polyol PPG, 5 parts of natural castor oil with OH=163mg KOH / g, 5 parts of amino-terminated polyether D-2000 and 20 parts of solvent sec-butyl acetate in a reaction vessel, and stir at room temperature 1h, forming material 2;

[0064] S3: Add 0.02 parts of the catalyst stannous octoate to material 1 under stirring at 45°C, add material 2 dropwise to material 1, raise the temperature to 85°C after the dropwise addition, and keep the temperature for 2.5 hours to prepare a modified polyurethane pre- polymer resin.

Embodiment 3

[0065] The preparation of embodiment 3 modified polyurethane prepolymer resins

[0066] S1: Put 25 parts of polyisocyanate compound MDI and 20 parts of solvent sec-butyl acetate in a reaction vessel, heat up to 45°C, stir for 1 hour, and form material 1;

[0067] S2: 22 parts of polyether polyol PPG, 2 parts of acrylate-polyethylene glycol-amino and 20 parts of solvent sec-butyl acetate are placed in a reaction vessel, and stirred at room temperature for 1 hour to form material 2;

[0068] S3: Add 0.02 parts of the catalyst stannous octoate to material 1 under stirring at 45°C, add material 2 dropwise to material 1, raise the temperature to 85°C after the dropwise addition, and keep the temperature for 2.5 hours to prepare a modified polyurethane pre- polymer resin.

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Abstract

The invention relates to a wet gas curing polyurethane heavy-duty anticorrosion coating which comprises, by mass, 70-99.9 parts of modified polyurethane prepolymer resin, 2-25 parts of pigment and filler, 0.5-3 parts of dispersant, 0.1-1 part of anti-settling agent, 0.2-2 parts of anti-flooding and anti-floating agent, 0.2-1 part of defoamer, 0.1-1 part of leveling agent, 5-15 parts of latent curing agent and 5-20 parts of water absorber. The polyurethane coating has a series of excellent performances like high storage stability, high surface smoothness, high curing film-forming speed, high adhesiveness with a substrate, high toughness and high chemical resistance, aging resistance and high-temperature resistance.

Description

technical field [0001] The invention belongs to the field of polyurethane anti-corrosion coatings, in particular to a single-component moisture-cured polyurethane heavy-duty anti-corrosion coating and a preparation method thereof. Background technique [0002] With the rapid development of my country's economic construction and national economy, various steel structures, concrete structures, aluminum-plastic structures, etc. are more and more applied to bridges, buildings, ports, transportation and other industrial and civil projects, but they are easy to corrode. The characteristics of (rust) have brought huge economic losses to the equipment manufacturing industry, and are detrimental to natural resources and environmental protection. Statistics show that corrosion losses account for 3-5% of GDP, exceeding the sum of losses caused by fires, floods, droughts, typhoons and other disasters. In 2010, China's corrosion losses were at least 1.2 trillion yuan, and if effective cor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/08C09D5/08C09D7/65C08G18/30C08G18/36C08G18/48C08G18/50C08G18/66
CPCC08G18/307C08G18/36C08G18/482C08G18/5021C08G18/6696C09D5/08C09D175/08C09D7/65C08L71/02
Inventor 王道前肖国亮连联益
Owner SWD HIGH TECH MATERIALS JIANGSU
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