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Synthetic method of polyester type polyurethane enamelled wire varnish with high heat-resistant grade

A technology of polyester polyurethane and wire enamel, which is applied in the synthesis of polyurethane varnish, and the synthesis field of grade polyester polyurethane wire enamel, which can solve the problems of not reaching C grade and so on.

Active Publication Date: 2014-08-06
江苏四达特材科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

U.S. Patent USP4110297 reports a polyurethane wire enamel, which is prepared from 30% polyurethane polyester resin and about 25% blocked isocyanate components, plus solvents, additives and catalysts. The paint has good low-temperature direct welding Resistance, chemical resistance and certain heat resistance, the heat resistance grade is F grade, which cannot reach C grade

Method used

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  • Synthetic method of polyester type polyurethane enamelled wire varnish with high heat-resistant grade

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Embodiment 1

[0021] Synthesis of imine, ethanolamine modified polyester resin: add diethylene glycol (2mol), diethanolamine (4.5mol), trimethylolpropane (0.4mol), tri-(2-hydroxyethyl ) isocyanurate (0.6mol) and zinc acetate accounting for 0.05% of the total, heated to 100°C-120°C, then added dimethyl terephthalate (5.2mol) and 3,3',4,4 '-Biphenyltetracarboxylic dianhydride (0.8mol) and imine-modified dicarboxylic acid (0.2mol), stir and dissolve, heat up to 150°C for 4 hours, heat up to 220°C for 10-12h to react, when the distillation head When the temperature is lower than 64°C, carry out vacuum operation, the pressure first decreases and then increases, first slow and then fast, until the viscosity is between 1300-1800mPa·s (25°C), stop the vacuum operation, take a sample to measure the acid value 2.34, the hydroxyl value 149.1, Add metered cresol and xylene and keep stirring until clarified to obtain imine and ethanolamine modified polyester resin. The best solid content of polyester r...

Embodiment 2

[0026]Synthesize modified polyester resin according to Example 1, wherein the molar ratio of dimethyl terephthalate and dianhydride to imine modified dicarboxylic acid is 4.5: 1. The described dianhydride is biphenyltetracarboxylic dicarboxylic acid anhydride. Synthesize sealing resin according to the method of Example 1, synthesize MDI trimer according to the method of Example 1, let the paint according to the method of Example 1, control the ratio of additives such as cresol, 60 parts of cresol, 15 parts of xylene, 30 parts of DMF , 1 part of zinc isooctanoate, 1 part of n-butanol, 4 parts of butyl ortho-titanate, heated and stirred and mixed evenly to obtain a yellow transparent paint solution with a solid content of 31.5% (180°C / 2g / 1h) and a viscosity of 33.9s (Coat 4 cups, 25°C), and make enamelled copper wire by coating the wire according to the process. The tested properties are shown in Table 1.

Embodiment 3

[0028] Synthesize modified polyester resin according to Example 1, wherein the molar ratio of dimethyl terephthalate and dianhydride to imine-modified dicarboxylic acid is 5:1, and the dianhydride is pyromellitic acid Dianhydride. Synthesize the sealing resin according to the method of Example 1, synthesize the MDI trimer according to the method of Example 1, let the paint according to the method of Example 1, control the ratio of additives such as cresol, 40 parts of cresol, 10 parts of xylene, and 60 parts of DMF , 1 part of zinc isooctanoate, 0.5 parts of n-butanol, 4 parts of butyl titanate, heated and stirred to mix evenly, and a yellow transparent paint liquid was obtained, with a solid content of 31.2% (180°C / 2g / 1h) and a viscosity of 33.8s (Coat 4 cups, 25°C), and make enamelled copper wire by coating the wire according to the process. The tested properties are shown in Table 1.

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Abstract

The invention discloses a synthetic method of a polyester type polyurethane enamelled wire varnish with a high heat-resistant grade, the enamelled wire varnish prepared by adopting the method has high heat-resistant performance and the heat-resistant grade reaches 200 or above. The synthetic method disclosed by the invention is characterized by comprising the synthetic processes of imine and ethanol amine modified polyester resin as follows: adding diethylene glycol, diethanol amine, trimethylol propane, tris-(2-hydroxyethyl) cyanuric acid and a catalyst into a reactor; heating the mixture to 100 to 120 DEG C; further adding dimethyl terephthalate, partial dianhydride and modified imine dicarboxylic acid; heating to 140 to 150 DEG C; reacting for more than 4 h; heating to 220 to 230 DEG C; reacting for more than 12 h; conducting vacuum operation when the temperature of a distillation head is below 65 DEG C until the viscosity is between 1300 to 1800 mPa.s (25 DEG C); adding cresol and xylene and stirring for dissolving and clarifying to obtain the imine and ethanol amine modified polyester resin until the solid content reaches 44%.

Description

technical field [0001] The invention relates to a method for synthesizing polyurethane varnish, in particular to a method for synthesizing high-grade heat-resistant polyester-type polyurethane enameled wire varnish, which belongs to the field of electrical insulation. Background technique [0002] Enameled wire enamel is one of the main varieties of insulating varnish. It is a special coating for coating motors, wires and electrical appliances. Apply a layer of insulating varnish that can block the current so that the current can pass through it according to the normal path. The paint film of wire enamel generally has good insulation, good heat resistance, good mechanical properties and good chemical resistance. Wire enamel is generally mainly composed of film-forming substances, solvents, and auxiliary materials. Among them, polyurethane enameled wire varnish has the following characteristics due to its unique structure: ①Good direct solderability. When welding polyuretha...

Claims

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Application Information

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IPC IPC(8): C09D175/06C09D5/25C08G18/80C08G18/79C08G18/42C08G63/685
Inventor 张斌陈以满姚成张建清张杏荣张衡伟
Owner 江苏四达特材科技有限公司
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