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

A technology of polyurethane varnish and wire varnish, which is applied in polyurea/polyurethane coating, cable/conductor manufacturing, electrical components, etc., and can solve problems such as uneven enameled wire surface and poor thermal shock performance, unstable batch quality of enameled wire varnish, enameled wire Avoid problems such as poor storage stability of paint, achieve the effect of promoting the reaction to proceed smoothly, stabilizing product quality, and avoiding side reactions

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) After the enameled wire is stored for a period of time, there are serious problems of voltage drop and salt water pinhole;
[0022] (3) The surface of the enameled wire is not smooth and the thermal shock performance is not good;
[0023] (4) The storage stability of enameled wire paint is poor;
[0024] (5) The production cycle of enameled wire paint is long, and the energy consumption is large, etc.
[0025] 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 B level high speed polyurethane enamelled wire paint
  • Method for preparing novel B level high speed polyurethane enamelled wire paint

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Step 1, the preparation of disubstituted aromatic dihydric alcohols:

[0069] 34 kg of terephthalic acid, 69 kg of neopentyl glycol, and 0.16 kg of organic titanium-antimony composite catalyst are reacted at 130°C-150°C for about 3 hours to produce 92-95 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 550, and its acid value is 2.7.

[0070] Step 2, the synthesis of hydroxyl component:

[0071] Add 47 kg of disubstituted aromatic diols, 94 kg of phthalic anhydride, 25 kg of adipic acid, 50 kg of glycerin, 150 kg of neopentyl glycol, 0.6 kg of organic titanium-antimony composite catalyst and 10 kg of xylene into the reactor. Start the heating device, react at 140°C to 180°C for 2 hours; then raise the temperature to 190°C and maintain it for 2 hours; then react at 195°C-200°C for 1 hour; start vacuuming, maintain 190°C, 0.05MPa~ 0.1MPa, unti...

Embodiment 2

[0077] Step 1, preparation of disubstituted aromatic dihydric alcohols

[0078]22 kg of terephthalic acid, 99 kg of neopentyl glycol, and 0.24 kg of organotitanium-antimony composite catalyst are reacted at 130°C-150°C for about 3 hours to produce 114-115 kg of disubstituted aromatic diols. Aromatic dihydric alcohol is a colorless transparent solution above the melting point, its melting point is 42°C-46°C, its hydroxyl value is 750, and its acid value is 1.6.

[0079] Step 2, the synthesis of hydroxyl components

[0080] Mix 50 kg of disubstituted aromatic diols, 250 kg of phthalic anhydride, 70 kg of adipic acid, 150 kg of 1,1,1-trimethylolpropane, 200 kg of neopentyl glycol, and compound organic titanium-antimony Catalyst 4 kilograms and 60 kilograms of xylenes are added in the reactor successively. Start the heating device, react at 140°C to 180°C for 2 hours; then raise the temperature to 190°C and maintain it for 2 hours; then react at 195°C-200°C for 1 hour; start vac...

Embodiment 3

[0086] Step 1, preparation of disubstituted aromatic dihydric alcohols

[0087] 10 kg of terephthalic acid, 45 kg of 2-methyl-1, 3-propanediol, and 0.15 kg of organic titanium-antimony composite catalyst are reacted at 130°C-150°C for about 3 hours to produce disubstituted aromatic diol 47 ~48 kg, the disubstituted aromatic dihydric alcohol is a colorless transparent solution above the melting point, the melting point is 40°C-45°C, the hydroxyl value is 760, and the acid value is 1.7.

[0088] Step 2, the synthesis of hydroxyl components

[0089] 40 kg of disubstituted aromatic diols, 160 kg of phthalic anhydride, 40 kg of adipic acid, 80 kg of 1,1,1-trimethylolpropane, 160 kg of 2-methyl-1,3-propanediol 1.5 kg of organotitanium-antimony composite catalyst and 35 kg of xylene were added to the reaction kettle in sequence. Start the heating device, react at 140°C to 180°C for 2 hours; then raise the temperature to 190°C and maintain it for 2 hours; then react at 195°C-200°C f...

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Abstract

The invention discloses a method for preparing novel B 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, for polycondensation 5 hours at 130-200 deg. C under atmosphere pressure, and closed constituent preparation consists of using substituted aromatic tertiary amine as catalyst, thus reacting 44'-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 B-level 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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