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Two-component polyurethane coating and preparation method thereof

A two-component polyurethane and polyurethane prepolymer technology, applied in polyurea/polyurethane coatings, coatings, anti-corrosion coatings, etc., can solve the problems of non-planar roofs, anti-arc coatings flowing, and electrical insulation performance decline And other issues

Active Publication Date: 2020-12-04
湖北南北车新材料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the anti-arc double polyurethane coating on the roof of rail transit needs to meet good mechanical properties and electrical resistance properties due to safety considerations. Nowadays, an anti-arc double polyurethane coating with excellent performance that can be applied to the flat roof of rail transit has also been developed. , such as in the Chinese patent application number 2017114372855, the anti-arc coating on the roof of rail transit vehicles has good electrical properties and can achieve good self-leveling on flat roofs, but there are many rail transit vehicle roofs It is non-planar and leveling anti-arc coating cannot be applied to non-planar roofs because it is prone to flow
In addition, due to the significant differences in the natural ambient temperature of the region, the lowest temperature in some extremely cold areas can be as low as -50°C. Therefore, it is required that the anti-arc coating on the roof of the rail transit vehicle must also have good low-temperature compliance to avoid extreme cold weather. The anti-arc coating on the roof of the locomotive was broken due to high-speed vibration, resulting in a decrease in electrical insulation performance and even a major safety accident
[0003] At present, there is no arc-proof polyurethane coating that meets the requirements of electrical insulation performance and mechanical performance, and has good comprehensive performance of cold and heat resistance and thixotropy, so that it can be applied to non-planar rail transit roofs

Method used

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  • Two-component polyurethane coating and preparation method thereof
  • Two-component polyurethane coating and preparation method thereof
  • Two-component polyurethane coating and preparation method thereof

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0032] The present embodiment provides a kind of preparation method of two-component polyurethane coating, comprises the steps:

[0033] Preparation of component A: by weight, add 20 parts of primary refined castor oil (hydroxyl value 164mgKOH / g), 10 parts (hydroxyl value 450mgKOH / g) and 15 parts of flame-retardant plasticizer Fyrol TEP, heated to 120°C, stirred and dehydrated under vacuum for 2 hours, then cooled to 60°C, and then respectively added 0.1 part of DabcoT-12A, 0.2 part of adhesive 0.5 parts of defoamer BYK6880, 0.5 parts of leveling agent BYK3700, 0.3 parts of dispersant Efka4300, 0.5 parts of fumed silica AEROSIL R202, 0.5 parts of polyamide wax Add Optima into the planetary stirring mixer, then add 40 parts of magnesium hydroxide and 10 parts of 4A molecular sieve respectively, stir for 2 hours in a vacuum state and discharge to obtain component A.

[0034]Preparation of component B: respectively add 32 parts of isocyanate CDMDI100L and 8 parts of polymeth...

Embodiment 2

[0037] The present embodiment provides a kind of preparation method of two-component polyurethane coating, comprises the steps:

[0038] Preparation of component A: by weight, add 30 parts in the reactor (hydroxyl value 56mgKOH / g), 9 parts (hydroxyl value 400mgKOH / g), 5 parts of flame retardant plasticizer DMMP, heated to 120 ° C, and stirred and dehydrated under vacuum for 2 hours, then cooled to 60 ° C, and then 0.3 parts of catalyst Dabco1028, 1 part of viscosity increase Agent ABITOL-E, 1 part of defoamer BYK-067A, 0.5 part of leveling agent BYK331, 0.6 part of dispersant Efka5244, 2.5 parts of polyamide wax Add Optima to the planetary stirring mixer, then add 28 parts of magnesium hydroxide, 22 parts of aluminum hydroxide, and 6 parts of desiccant 4A molecular sieve, stir for 2 hours in a vacuum state and discharge to obtain component A.

[0039] Prepare B component:

[0040] 25 parts of isocyanate MDI-50, 5 parts of polymethylene polyphenyl isocyanate Add in the ...

Embodiment 3

[0043] The present embodiment provides a kind of preparation method of two-component polyurethane coating, comprises the steps:

[0044] Prepare component A:

[0045] In parts by weight, add 40 parts in the reactor (hydroxyl value 140mgKOH / g), 12 parts (hydroxyl value 365mgKOH / g), 1 part flame retardant plasticizer Heat to 120°C, stir and dehydrate under vacuum for 2 hours, then cool down to 60°C, add 0.5 parts of catalyst Polycat@SA20, 0.2 parts of tackifier Add 0.8 parts of defoamer BYK085, 1.5 parts of leveling agent BYK306, 1.2 parts of dispersant BYK2155, 8 parts of fumed silica TS720, then add 25 parts of aluminum hydroxide, 10 parts of antimony trioxide, and 6 parts of 4A molecular sieve to the planet In a stirring mixer, stir under vacuum for 2 hours and discharge to obtain component A.

[0046] Prepare B component:

[0047] Add 44 parts of isocyanate MDI-100 and 2 parts of polymethylene polyphenyl isocyanate Cosmonate MX-200 into the reactor, continuously fee...

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Abstract

The invention provides a two-component polyurethane coating and a preparation method, and the two-component polyurethane coating comprises a component A and a component B. The component A comprises the following raw materials by weight: 30-60 parts of polymer polyol, 0.5-15 parts of a plasticizer, 0-0.6 part of a catalyst, 0.2-1 part of a tackifier, 0.3-1.3 parts of an antifoaming agent, 0.6-10 parts of a thixotropic agent, 0.5-1.5 parts of a leveling agent, 0-1.5 parts of a dispersant, 20- 60 parts of a filler and 4-10 parts of a desiccant; and the component B comprises a polyurethane prepolymer. The coating has the beneficial effects that the 45-degree-angle flame retardant property of the arc-proof coating for the roof of the rail transit vehicle meets the flame retardant grade of technical conditions of flame retardant materials of railway industry standard TB / T 3138 locomotives and vehicles, and the fireproof property meets the fireproof property requirements of materials and components of European Union EN 45545-2 rail vehicles. Under the requirements of GB / T 1771-2007 salt spray test standards, the coating is exposed in neutral salt spray for 1000 hours and has no visible corrosion.

Description

technical field [0001] The invention belongs to the field of paint manufacturing, and in particular relates to a two-component polyurethane coating and a preparation method. Background technique [0002] At present, the anti-arc double polyurethane coating on the roof of rail transit needs to meet good mechanical properties and electrical resistance properties due to safety considerations. Nowadays, an anti-arc double polyurethane coating with excellent performance that can be applied to the flat roof of rail transit has also been developed. , such as in the Chinese patent application number 2017114372855, the anti-arc coating on the roof of rail transit vehicles has good electrical properties and can achieve good self-leveling on flat roofs, but there are many rail transit vehicle roofs It is non-planar, and leveling anti-arc coating cannot be applied to non-planar roofs because it is prone to flow. In addition, due to the significant differences in the natural ambient tem...

Claims

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Application Information

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IPC IPC(8): C09D175/04C09D5/25C09D5/18C09D5/08C08G18/65C08G18/62C08G18/36C08G18/10
CPCC09D175/04C09D5/00C09D5/18C09D5/08C08G18/6547C08G18/6208C08G18/36C08G18/10C08K2003/2224C08L2201/02C08L77/00C08K3/36C08K7/24C08K3/22C08K5/523C08K13/04C08K13/02C08G18/65Y02T30/00
Inventor 李建林杨足明赵祖培杨志星张洋王翠花张虎极韩胜利赵勇刚章锋
Owner 湖北南北车新材料有限公司
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