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Production of cryogenic direct-welding polyurethane envelope without pinhole

A technology of polyurethane paint and wire-wrapped paint, applied in the direction of polyurea/polyurethane coatings, coatings, etc., to reduce the direct welding temperature, improve the quality stability, and improve the adhesion.

Inactive Publication Date: 2007-09-05
DANYANG STAR CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no patent report on polyurethane wire enamel for low-temperature soldering (below 370°C) in China

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Preparation of hydroxyl component:

[0024] 10 kg of stearic acid, 2 kg of terephthalic acid, 10 kg of phthalic anhydride, 3 kg of adipic acid, 12 kg of glycerin, 3 kg of neopentyl glycol, 0.3 kg of organic titanium-antimony composite catalyst and 5 kg Xylene was sequentially added to the reactor. Start the heating device, and uniformly heat up the reaction between 100°C and 180°C for 2 hours; uniformly heat up the reaction for 2 hours between 180°C and 200°C; Minutes; finally add 10 kg of cresol and react for 1 hour between 180°C and 200°C, then add 19 kg of cresol, 13 kg of aromatic solvent naphtha, and 12 kg of xylene in turn, stir evenly, and cool to room temperature to obtain the hydroxyl component. The technical indicators for determining the polyester polyol resin in the hydroxyl component are: acid value 2.2 mgKOH / g, hydroxyl value 220 mgKOH / g, number average molecular weight 4500, molecular weight distribution index 2.1.

[0025] (2) Preparation of closur...

Embodiment 2

[0032] (1) Preparation of hydroxyl component:

[0033] 9 kg of palmitic acid, 2 kg of terephthalic acid, 11 kg of phthalic anhydride, 2.5 kg of adipic acid, 13 kg of trimethylolpropane, 2.5 kg of diethylene glycol, and 0.3 kg of organic titanium-antimony composite catalyst Two kilograms and five kilograms of xylene were added to the reaction kettle in turn. Start the heating device, and uniformly heat up the reaction between 100°C and 180°C for 2 hours; uniformly heat up the reaction for 2 hours between 180°C and 200°C; Minutes; finally add 10 kg of cresol and react for 1 hour between 180°C and 200°C, then add 19 kg of cresol, 13 kg of aromatic solvent naphtha, and 12 kg of xylene in turn, stir evenly, and cool to room temperature to obtain the hydroxyl component. The technical indicators for determining the polyester polyol resin in the hydroxyl component are: acid value 1.9 mgKOH / g, hydroxyl value 230 mgKOH / g, number average molecular weight 5500, molecular weight distribut...

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Abstract

A low-temperature straight-welding polyurethane wire enamel without pin hole is carried out by preparing hydroxide radical component, preparing enclosed component and formulating wire enamel. It can be used for extended or bended zero pin hole below 340degree.

Description

technical field [0001] The invention relates to a preparation method of polyurethane enameled wire varnish capable of direct welding at low temperature and without pinholes. Background technique [0002] Enameled wire enamel is a kind of electrical insulation coating specially used for coating enameled wires. Polyurethane wire enamel and the coated polyurethane enameled wire have the following characteristics due to their unique chemical structure: [0003] First, the direct solderability is good. When welding polyurethane enameled wire, it is not necessary to remove the paint film layer in advance, and the soldering temperature is low (about 375°C) and the speed is fast (about 3 seconds); [0004] Second, the dyeability is good. Polyurethane enameled wire paint can be miscible with various dyes to make various colored enameled wires, which is suitable for occasions with multiple solder joints; [0005] Third, the high-frequency performance is good, and the dielectric loss...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/06C08G18/42C08G63/183C08G63/85
Inventor 左晓兵张建耀吴银忠朱亚辉
Owner DANYANG STAR CHEM
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