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Method for synthesizing C-level polyurethane wire enamel

A technology of polyurethane paint and synthesis method, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve problems such as the influence of physical properties of products, restrict the development of electrical insulation industry, poor heat resistance, etc., and achieve good solderability and physical properties. The effect of easy control of the reaction process and high heat resistance

Active Publication Date: 2013-09-11
江苏四达特材科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there are not many large-scale industrial production of polyurethane wire enamel in my country, and the main products are mainly F-grade (155°C) polyurethane wire enamel, which has a big gap with foreign countries, which seriously restricts the development of my country's electrical insulation industry. , in order to meet the market demand, aiming at the disadvantage of poor heat resistance of polyurethane wire enamel, it is necessary to develop C-grade high temperature resistant direct solderable polyurethane wire enamel
[0003] Chinese patent CN102140157A uses organosilicon polymer to modify polyurethane paint, which improves the performance of polyurethane paint in high temperature environment, but due to the addition of organosilicon polymer, the physical properties of the product have a certain impact

Method used

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  • Method for synthesizing C-level polyurethane wire enamel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] In a three-necked flask equipped with a stirrer, a thermometer and a condenser, add a metered amount of tris-(2-hydroxyethyl) isocyanurate (1.0mol), N-methyldiethanolamine (6.5mol), 3,3 ',4,4'-Biphenyltetracarboxylic dianhydride (0.8mol) and zinc acetate as a catalyst, heat to 100-120℃, then add dimethyl terephthalate (5.2mol), stir to dissolve, heat up to 150 React at ℃ for 4h, program the temperature to 220℃ for reaction. When the temperature of the distillation head is lower than 60℃, perform vacuum operation. The pressure will be small and then large, first slow and fast until the viscosity is between 950-1300mPas (25℃), stop the vacuum Operate, take a sample to measure the acid value of 2.49 and the hydroxyl value of 147.1, add a metered amount of cresol to dissolve it until it is clear.

[0020] Add a certain amount of diphenylmethane diisocyanate into a three-necked reaction flask equipped with reflux condenser, thermometer and stirrer, add the same amount of DMF an...

Embodiment 2

[0023] In a three-necked flask equipped with a stirrer, a thermometer and a condenser, add a metered amount of tris-(2-hydroxyethyl) isocyanurate (1.0mol), N-methyldiethanolamine (6.5mol), 3,3 ′,4,4′-benzophenonetetracarboxylic dianhydride (0.8mol) and zinc acetate as a catalyst, heat to 100-120℃, then add dimethyl terephthalate (5.2mol), stir to dissolve, heat up to 150 React at ℃ for 4h, program the temperature to 220℃ for reaction. When the temperature of the distillation head is lower than 60℃, perform vacuum operation. The pressure will be small and then large, first slow and fast until the viscosity is between 950-1300mPas (25℃), stop the vacuum Operate, take a sample to measure the acid value of 2.71 and the hydroxyl value of 198.2, add a metered amount of cresol to dissolve it until it is clear.

[0024] Mix 160.1g of the above polyester polyol, 700.2g of MDI trimer in Example 1, 850.1g of cresol, 430.2g of xylene, 201.1g of DMF, 35.1g of zinc isooctanoate, heating, stirr...

Embodiment 3

[0026] In a three-necked flask equipped with a stirrer, a thermometer and a condenser, add a metered amount of tri-(2-hydroxyethyl) isocyanurate (1.0 mol), N-methyldiethanolamine (6.5 mol), and pyromellitic acid Formic dianhydride (0.8mol) and zinc acetate as a catalyst, heat to 100-120°C, then add dimethyl terephthalate (5.2mol), stir to dissolve, heat up to 150°C and react for 4h, program the temperature to 220°C to react, When the temperature of the distillation head is lower than 60℃, carry out vacuum operation. The pressure will be low first, then high, slow first and then fast until the viscosity is between 950-1300mPas (25℃), stop vacuum operation, take samples to measure acid value 1.35 and hydroxyl value 210.4 , Add metered cresol to dissolve until clear.

[0027] Combine 150.1g of the above polyester polyol, 800.2g of MDI trimer in Example 1, 851.1g of cresol, 433.2g of xylene, 204.1g of DMF, and 34.1g of zinc isooctanoate, heat and stir to mix evenly to obtain a yellow...

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Abstract

The invention discloses a method for synthesizing C-level polyurethane wire enamel. The C-level polyurethane wire enamel prepared by the method has high heat-resistant performance and solderability and physical performance, and the heat-resistant level reaches a C level. The method for synthesizing the C-level polyurethane wire enamel mainly comprises the following steps of: synthesizing polyester polyol, synthesizing a diphenylmethane diisocyanate (MDI) tripolymer and preparing polyurethane paint, wherein the polyester polyol is prepared by reacting dimethyl terephthalate, tri-(2-ethoxy) isocyanurate and dihydric alcohol which serve as raw materials under the action of a catalyst; and the dihydric alcohol is N-methyldiethanolamine, and part of dimethyl terephthalate is replaced by adding tetracarboxylic dianhydride for reaction.

Description

Technical field [0001] The invention relates to a method for synthesizing polyurethane paint, more specifically to a method for synthesizing a grade C polyurethane enameled wire paint, and belongs to the field of electrical insulation. Background technique [0002] Enameled wire paint is a large category of insulating paint. It is a kind of special paint for coating wires, motors and electrical equipment. That is, in the manufacture of electrical products such as engines, capacitors, cables, etc., it is necessary to apply a coating between conductors and conductors. Layer of paint that can insulate electricity. The paint film of enameled wire paint generally has good insulation, good heat resistance, good mechanical properties and good chemical resistance. Enameled wire paint is generally composed of film-forming substances and diluents. The film-forming substances include polyurethane resin, polyester resin, polyester imide resin, epoxy resin, bismaleimide resin, silicone resin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D175/06C08G18/79C08G18/46C08G63/685
Inventor 张斌姚成林杰张建清孙兰娟张杏荣张衡伟
Owner 江苏四达特材科技有限公司
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