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Highly heat-resistant polyurethane insulating paint and preparation method thereof

A polyurethane and insulating paint technology, applied in polyurea/polyurethane coatings, fire-retardant coatings, coatings, etc., can solve the problems that polyesterimide insulating paint does not have direct welding performance and is inconvenient to use, and achieves excellent softening resistance. Wide range of application areas and the effect of improving mechanical strength

Active Publication Date: 2018-05-04
东莞宏石功能材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] At present, the high heat-resistant grade (grade 180) insulating varnish on the market is mainly based on polyesterimide insulating varnish, which is widely used and has a huge market share. However, polyesterimide insulating varnish does not have direct welding performance and requires the use of paint remover Welding can only be carried out, which is more inconvenient to use

Method used

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Examples

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Effect test

Embodiment 1

[0024] A kind of high heat-resistant polyurethane insulating varnish, described high heat-resistant polyurethane insulating varnish is made by the reaction of polyester polyol, blocked isocyanate, modified PU resin, catalyst and mixed solvent; Wherein, polyester polyol, blocked isocyanate , The mass ratio of the modified PU resin to the mixed solvent is 1:1:0:0.4, and the consumption of the catalyst is 0.1% of the total mass of the reactants.

[0025] The preparation method of the polyester polyol is as follows: mix imide carboxylic acid diol, dibasic acid, triol and catalyst, mix evenly and then heat up to 160°C for esterification reaction, when the water yield reaches 80%, , slowly raise the temperature to 210°C, react for 4 hours to reach the end of the reaction, then cool down to 150°C, add a certain amount of mixed solvent, stir evenly, and prepare polyester polyol with a solid content of 40%; among them, imide carboxylic acid, di The mass ratio of polyhydric alcohol, dib...

Embodiment 2

[0035] A kind of high heat-resistant polyurethane insulating varnish, described high heat-resistant polyurethane insulating varnish is made by the reaction of polyester polyol, blocked isocyanate, modified PU resin, catalyst and mixed solvent; Wherein, polyester polyol, blocked isocyanate , The mass ratio of the modified PU resin to the mixed solvent is 1:1.2:0.1:0.7, and the consumption of the catalyst is 1% of the total mass of the reactants.

[0036] The preparation method of the polyester polyol is as follows: mix imide carboxylic acid diol, dibasic acid, triol and catalyst, mix evenly and then heat up to 162°C for esterification reaction, when the water yield reaches 80%, , slowly warming up to 215°C, reacting for 4.5h to reach the end of the reaction, then cooling down to 150°C, adding a certain amount of mixed solvent, stirring evenly, and preparing polyester polyol with a solid content of 42%; wherein, imide carboxylic acid, The mass ratio of the dibasic alcohol, the d...

Embodiment 3

[0046] A kind of high heat-resistant polyurethane insulating varnish, described high heat-resistant polyurethane insulating varnish is made by the reaction of polyester polyol, blocked isocyanate, modified PU resin, catalyst and mixed solvent; Wherein, polyester polyol, blocked isocyanate , The mass ratio of the modified PU resin to the mixed solvent is 1:1.4:0.25:0.8, and the consumption of the catalyst is 2.5% of the total mass of the reactants.

[0047] The preparation method of the polyester polyol is as follows: mix imide carboxylic acid diol, dibasic acid, triol and catalyst, mix evenly and then heat up to 165°C for esterification reaction, when the water yield reaches 80%, , slowly warming up to 225°C, reacting for 5 hours to reach the end of the reaction, then cooling down to 150°C, adding a certain amount of mixed solvent, stirring evenly, and preparing polyester polyol with a solid content of 45%; wherein, imide carboxylic acid, di The mass ratio of alcohol, dibasic ...

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Abstract

The invention relates to the technical field of insulating paint, in particular to highly heat-resistant polyurethane insulating paint and a preparation method thereof. The highly heat-resistant polyurethane insulating paint is prepared by carrying out a reaction on polyester polyol, closed isocyanate, modified PU resin, a catalyst and a mixed solvent, wherein the mass ratio of polyester polyol, closed isocyanate, modified PU resin, and the mixed solvent is 1: (1-1.8): (0-0.5): (0.4-1.5), and the dosage of the catalyst is 0.1-5% of total mass of reactants. The high heat-resistant degree of thehighly heat-resistant polyurethane insulating paint provided by the invention reaches 108 levels, is excellent in solderability, has relatively high apparatus performance, mechanical strength and excellent heat impact resistance and softening resistance and can be widely applied to high-temperature-resistant and Freon-resistant motors and apparatuses.

Description

technical field [0001] The invention relates to the technical field of insulating varnish, in particular to a high heat-resistant polyurethane insulating varnish and a preparation method thereof. Background technique [0002] At present, the high heat-resistant grade (grade 180) insulating varnish on the market is mainly based on polyesterimide insulating varnish, which is widely used and has a huge market share. However, polyesterimide insulating varnish does not have direct welding performance and requires the use of paint remover Welding can only be carried out, which is inconvenient to use. Contents of the invention [0003] In order to overcome the shortcomings and deficiencies in the prior art, the object of the present invention is to provide a high heat-resistant polyurethane insulating paint, which has high heat resistance, a high heat-resistant grade of 180, and direct welding Good performance, high electrical performance, mechanical strength, superior thermal s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/12C09D175/04C09D5/25
CPCC08L2201/08C08L2203/20C09D5/00C09D5/18C09D175/12C08L75/04
Inventor 刘殷良林涤非
Owner 东莞宏石功能材料科技有限公司
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