Method for preparing novel F level high speed polyurethane enamelled wire paint

A polyurethane varnish and wire varnish technology, applied in polyurea/polyurethane coatings, cable/conductor manufacturing, electrical components, etc., can solve problems such as low pass rate, unstable batch quality of enameled wire varnish, and salt water pinholes, etc., to achieve Effects of improving heat resistance and mechanical properties, promoting smooth reaction, and reducing raw material costs

Inactive Publication Date: 2005-07-06
左晓兵 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] (1) The quality of enameled wire paint batches is unstable;
[0021] (2) The pass rate of heat-resistant polyurethane wire enamel products above grade F is low;
[0022] (3) After the enameled wire is stored for a period of time, there are serious problems of voltage drop and salt water pinhole;
[0023] (4) The surface of the enameled wire is not smooth and the thermal shock performance is not good;
[0024] (5) The storage stability of enameled wire paint is poor;
[0025] (6) The production cycle of enameled wire paint is long, and the energy consumption is large, etc.
[0026] Existing wire enamel can only be used in occasions where enameled wire requirements are not high. With the development of science and technology, people have higher and higher requirements for enameled wire enamel. Therefore, some shortcomings of polyurethane enameled wire enamel must be improved. while maintaining its excellent properties unaffected

Method used

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  • Method for preparing novel F level high speed polyurethane enamelled wire paint
  • Method for preparing novel F level high speed polyurethane enamelled wire paint

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] Step 1, the preparation of disubstituted aromatic dihydric alcohols:

[0072] 17 kg of terephthalic acid, 34 kg of neopentyl glycol, and 0.08 kg of organic titanium-antimony composite catalyst are reacted at 130°C-150°C for about 3 hours to produce 46-47 kg of disubstituted aromatic diols. Aromatic dihydric alcohol is a colorless transparent solution above the melting point, its melting point is 45°C-50°C, its hydroxyl value is 540, and its acid value is 2.8.

[0073] Step 2, the synthesis of hydroxyl component:

[0074] 47 kg of disubstituted aromatic dihydric alcohols, 95 kg of phthalic anhydride, 24 kg of adipic acid, 24 kg of tris (α-hydroxyethyl) isocyanurate, 24 kg of glycerin, and 95 kg of neopentyl glycol 1 kg of organotitanium-antimony composite catalyst and 10 kg of xylene were added to the reaction kettle in sequence. Start the heating device, react at 140°C to 180°C for 3 hours; then raise the temperature to 190°C and maintain it for 2 hours; then react at...

Embodiment 2

[0080] Step 1. Preparation of double-substituted aromatic diols

[0081] 20 kg of terephthalic acid, 90 kg of neopentyl glycol, 0.22 kg of organic titanium-antimony composite catalyst, and 104 to 105 kg of di-substituted aromatic diols can be generated by reacting at 130℃-150℃ for about 3 hours. The aromatic diol is a colorless and transparent solution above the melting point, its melting point is 41°C-45°C, the hydroxyl value is 759, and the acid value is 1.8.

[0082] Step 2. Synthesis of hydroxyl components

[0083] 50 kg of di-substituted aromatic diols, 250 kg of phthalic anhydride, 70 kg of adipic acid, 100 kg of tris(α-hydroxyethyl) isocyanurate, 50 kg of glycerin, and 270 kg of neopentyl glycol , 5 kg of organic titanium-antimony composite catalyst and 40 kg of xylene were successively added to the reaction kettle. Start the heating device, react at 140°C to 180°C for 3 hours; then raise the temperature to 190°C for 2 hours; then react at 195°C to 200°C for 1 hour; s...

Embodiment 3

[0089] Step 1. Preparation of double-substituted aromatic diols

[0090] 10 kg of terephthalic acid, 45 kg of 2-methyl-1, 3-propanediol, 0.15 kg of organic titanium-antimony composite catalyst, and reacted at 130℃-150℃ for about 3 hours to generate double-substituted aromatic diol 47 ~48kg, the disubstituted aromatic diol is a colorless and transparent solution above the melting point, its melting point is 40°C-45°C, the hydroxyl value is 760, and the acid value is 1.7.

[0091] Step 2. Synthesis of hydroxyl components

[0092] 40 kg of di-substituted aromatic diols, 230 kg of phthalic anhydride, 50 kg of adipic acid, 80 kg of tris(α-hydroxyethyl) isocyanurate, 1,1,1-trimethylol 45 kilograms of propane, 240 kilograms of 2-methyl-1,3-propanediol, 3 kilograms of organic titanium-antimony composite catalyst and 35 kilograms of xylene were successively added to the reaction kettle. Start the heating device, react at 140°C to 180°C for 3 hours; then raise the temperature to 190°C...

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Abstract

The invention discloses a method for preparing novel F level high speed polyurethane enamelled wire paint, wherein the hydroxyl preparation consists of, using organic titanium-antimony complex as catalyst, substituted aromatic dibasic alcohol as adjuvant, tri (alpha-ethoxyl) isocyanate as modifier for polycondensation 6 hours at 130-200 deg. C under atmosphere pressure, and closed constituent preparation consists of using substituted aromatic tertiary amine as catalyst, thus reacting 4,4'-methyl diphenylene diisocyanate with trimethylolpropane, and obtaining a proportion of isocyanate urea rings with thermotolerant structure.

Description

Technical field: [0001] The invention relates to a preparation method of a novel F-grade high-speed polyurethane wire enamel. Background technique: [0002] Enameled wire enamel is an important class of electrical insulation coatings, which are mainly coated on the outer layer of various types of bare copper wires with different wire diameters. Generally, it is made by repeatedly coating enamelled wire varnish on the conductor with an enamelling machine and baking at high temperature. The effect of the enameled wire varnish is to create a good insulating layer between the wires in the winding to prevent the flow of current. This layer of insulating layer can maintain its original performance under long-term moisture, heat, chemical immersion and various mechanical forces such as friction, bending, stretching, compression, impact, etc. Therefore, the basic requirements of the enameled wire should not only meet the excellent insulation performance, but also have high mechani...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/04H01B13/22
Inventor 左晓兵朱夕明杨昌正
Owner 左晓兵
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