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H-grade low-temp. beading polyurethane paint wire-covering paint

A technology of polyurethane paint and enameled wire paint, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of poor thermal shock performance, poor product performance stability, excessive breakdown voltage drop, etc., to improve heat resistance. and hot stamping performance, reducing production costs, and the effect of stable polyester quality

Inactive Publication Date: 2003-02-05
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The solid content of the paint liquid is more than 40%, and the comprehensive performance of the painted paint film is better, but the reaction is multi-step feeding, the steps are cumbersome, and the cost is high
[0012] At present, in China, polyurethane wire enamel uses toluene diisocyanate (TDI) as the main raw material to prepare the sealer, and the hydroxyl component is polyester synthesized from dimethyl terephthalate, ethylene glycol, and glycerin as the main raw materials. The prepared polyurethane enameled wire The heat resistance grade of the paint is B grade, and there are two industrial technical problems in different degrees: (1) the breakdown voltage drops too much during storage, (2) the heat shock resistance is poor
According to the information obtained from the market and the Internet, there are also a few manufacturers in China that have F-class polyurethane wire enamel products modified by Sike and (or) imine, but the production scale is small, the product performance stability is poor, and the thermal shock resistance has not yet reached the use level. unit requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] The preparation of embodiment 1 terephthalic acid dihydric alcohol

[0071] React 17 kg of terephthalic acid, 21 kg of neopentyl glycol, and 0.11 kg of stannous octoate catalyst at 130-200°C for about 3 hours to generate terephthalic acid diol, and the reaction mixture is colorless and transparent above the melting point solution. After analysis, the melting point range of terephthalic acid diol is 40-50°C, the hydroxyl value is 310, and the acid value is 2.8. Preparation of the hydroxyl component

[0072] 30 kg of phthalic anhydride, 22 kg of adipic acid, 34 kg of terephthalic diol mixture, 17 kg of neopentyl glycol, 4 kg of glycerin, tris (α-hydroxyethyl) isocyanurate 22 kg, 10 kg of xylene and 1.5 kg of catalyst stannous octoate were added to the reaction kettle in sequence. The reaction kettle is equipped with a water separation device with a short fractionation column. Start the heating device, react at 140°C to 180°C for 5 hours; ...

Embodiment 2

[0076] The preparation of embodiment 2 amidoimide glycols

[0077] React 35 kg of toluene diisocyanate, 19 kg of trimellitic anhydride, and 40 kg of DMF at 120-130°C for 3 hours, then add 21 kg of neopentyl glycol and react at 140-150°C for about 4 hours to obtain the target product amide imide di Alcohols. The product has good miscibility with the above polyester raw materials. After analysis, the hydroxyl value of the amidoimide diol is 178, and the acid value is 4.8. Preparation of the hydroxyl component

[0078] 30 kg of phthalic anhydride, 22 kg of adipic acid, 96 kg of amidoimide diol mixture, 17 kg of neopentyl glycol, 4 kg of glycerin, tris (α-hydroxyethyl) isocyanurate 22 kg, 8 kg of xylene and 1.6 kg of catalyst stannous octoate were added to the reaction kettle in turn. The reaction kettle is equipped with a water separation device with a short fractionation column. Start the heating device, react at 140°C to 180°C for 5 hours; the...

Embodiment 3

[0082] The preparation of embodiment 3 terephthalic acid dihydric alcohols

[0083] 3 kg of terephthalic acid, 9 kg of 2-methyl-1, 3-propanediol, and 0.15 kg of stannous octoate catalyst are reacted at 130-200°C for about 3 hours to generate terephthalic acid diol, which is above the melting point. The reaction mixture was a colorless transparent solution. After analysis, the melting point range of the modified diol is 40-50°C, the hydroxyl value is 69, and the acid value is 2.8. Preparation of the hydroxyl component

[0084] 15 kg of phthalic anhydride, 3 kg of adipic acid, 2.7 kg of terephthalic acid diol mixture, 2.4 kg of 2-methyl-1, 3-propanediol, 2.7 kg of glycerin, three (α-hydroxyethyl ) 15 kilograms of isocyanurate, 3.8 kilograms of TMP, 10 kilograms of xylene and 0.43 kilogram of catalyst stannous octoate are added in the reactor successively. The reaction kettle is equipped with a water separation device with a short fractionation c...

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Abstract

The present invention relates to a H-grade low-temp. direct-welding enamelled wire enamel, said enamel liquor mainly includes three portions of hydroxyl component, closed type isocyanate component and solvent. The hydroxyl component is formed from raw materials of dihydric alcohol terephthate or amidoimide dihydric alcohol, new pentanediol or 2-methyl-1,3-propanedio, glycerine, 1,1,1-trihydroxymethyl propane, tri(alpha-hydroxyethyl) isocyanate, adipic acid and phthalic anhydride. The acid value of polyester polybasic alcohol is less than 2, hydroxy value is 70-250, number-average molecular weight is 2000-7000 and molecualr weight distribution index is 2-3. The isocyanate component is made up by using general raw material TDI and MDI through the processes of cyclic self-polymerization or addition with small quantity of tribasic alcohol and closing with dimethyl phenol.

Description

field of invention [0001] The invention relates to an H-grade low-temperature direct-welding polyurethane wire enamel and a preparation method thereof. Background of the invention [0002] Enameled wire enamel is an important class of electrical insulation coatings, which are mainly dip-coated on the outer layers of various types (round wires, flat wires) and 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 the action of long-term moisture, heat, chemical impregnation and various mechanical forces such as friction, bending, stretching, compression, impact, etc. Therefore, the basic requirements of enameled wire enamel s...

Claims

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Application Information

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IPC IPC(8): C09D175/04
Inventor 杨昌正左晓兵蒋锡群陈雷
Owner NANJING UNIV
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