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A hot-melt self-adhesive paint and its application in enameled wire

A self-adhesive paint and enameled wire technology, applied in the field of paint materials, can solve the problem of low re-softening temperature, achieve good film-forming effect, ensure lubrication, and three-dimensional adsorption space.

Active Publication Date: 2022-04-05
红旗集团江西铜业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, self-adhesive paints are mainly butyral and aliphatic polyamide self-adhesive enameled wires. The disadvantage of these products is that the resoftening temperature is low, generally below 120 ° C, which limits the application in fields with high temperature and thermal characteristics requirements. In addition, completely aromatic polyamide resin is used, and there is no bondable unit in its main chain structure. Even if it is heated to 260°C, it will not bond to each other.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A kind of enameled wire comprises following preparation method:

[0029] Step 1: Mix 25 parts of phthalic acid, 10 parts of sebacic acid, and 34 parts of 4,4' diphenylmethane diisocyanate in molar ratio, continue to add 5 parts of dendritic polyether, mix well, and heat to 180°C. Add 1.2 parts of montmorillonite, cool at 80°C, add 1.6 parts of zeolite composed of different particle size segments, and after the solution is in a uniform state, continue to cool down to 25°C to obtain a hot-melt self-adhesive paint; the cooling rate is 15°C / min .

[0030] Step 2: Process the metal conductor and heat it to 50°C, evenly coat the polyurethane elastomer heated to the molten state on the surface of the metal conductor, add the liquid hot-melt self-adhesive paint into the centrifuge, and then put the polyurethane elastomer coated Put the metal conductor in a centrifuge and centrifuge at a low speed (500rpm) for 5 minutes, then centrifuge at a high speed (1000rpm) for 3 minutes, ...

Embodiment 2

[0032] A kind of enameled wire comprises following preparation method:

[0033] Step 1: Mix 25 parts of phthalic acid, 10 parts of sebacic acid, and 34 parts of 4,4' diphenylmethane diisocyanate in molar ratio, continue to add 5 parts of dendritic polyether, mix well, and heat to 180°C. Add 1.2 parts of montmorillonite, cool at 90°C, add 1.6 parts of zeolite composed of different particle size segments, and after the solution is in a uniform state, continue to cool down to 30°C to obtain a hot-melt self-adhesive paint; the cooling rate is 15°C / min .

[0034] Step 2: Process the metal conductor and heat it to 50°C, evenly coat the polyurethane elastomer heated to the molten state on the surface of the metal conductor, add the liquid hot-melt self-adhesive paint into the centrifuge, and then put the polyurethane elastomer coated Put the metal conductor in a centrifuge and centrifuge at low speed (500rpm) for 8 minutes, then centrifuge at high speed (900rpm) for 5 minutes, and f...

Embodiment 3

[0036] A kind of enameled wire comprises following preparation method:

[0037] Step 1: Mix 25 parts of phthalic acid, 10 parts of sebacic acid, and 34 parts of 4,4' diphenylmethane diisocyanate in molar ratio, continue to add 5 parts of dendritic polyether, mix well, and heat to 180°C. Add 1.2 parts of montmorillonite, cool at 90°C, add 1.6 parts of zeolite composed of different particle size segments, and after the solution is in a uniform state, continue to cool down to 30°C to obtain a hot-melt self-adhesive paint; the cooling rate is 18°C / min .

[0038] Step 2: Process the metal conductor and heat it to 50°C, evenly coat the polyurethane elastomer heated to the molten state on the surface of the metal conductor, add the liquid hot-melt self-adhesive paint into the centrifuge, and then put the polyurethane elastomer coated Put the metal conductor in a centrifuge and centrifuge at low speed (500rpm) for 8 minutes, then centrifuge at high speed (900rpm) for 5 minutes, and f...

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PUM

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Abstract

The invention discloses a hot-melt self-adhesive varnish and its application in enameled wires, belonging to the field of enameled wires, comprising the following raw materials: mixed dibasic acid, diisocyanate or diamine, dendritic polyether, montmorillonite and different particle size segments composed of zeolites. A kind of hot-melt self-adhesive paint of the present invention, in the resin that is obtained by the reaction of mixed dibasic acid and diisocyanate or diamine, because aromatic dibasic acid contains benzene ring structure in mixed dibasic acid, makes the resin's The main chain contains a benzene ring, which has a great influence on the low-temperature performance of the resin. The vibration of the benzene ring at low temperature has a secondary transformation, which will increase the flexibility of the resin at low temperature.

Description

technical field [0001] The invention relates to paint materials, in particular to a hot-melt self-adhesive paint and its application to enameled wires. Background technique [0002] Self-adhesive paint for enameled wire is widely used in audio coils, small motors, hollow motors, power tools, special-shaped coils and frameless coils, etc. [0003] Enameled wire self-adhesive varnish is mainly divided into hot-melt self-adhesive varnish and alcohol-soluble self-adhesive varnish. It is an important electrical insulation coating and is mainly coated on the outer layer of various types of enameled 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 unique bonding characteristics of self-adhesive enameled wire make the coil no longer need a "skeleton" during the forming process, and also omit the impregnation treatment in the processing of some produ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D175/04C09D5/25C09D7/65C09D7/61H01B3/30H01B7/02H01B7/04H01B13/06H01B13/16
CPCC09D175/04C09D7/65C09D7/61C09D7/70H01B7/04H01B7/0216H01B7/0291H01B13/065H01B13/165H01B3/308C08L71/00C08K3/346C08K7/26
Inventor 王贤良伍远新姜涛
Owner 红旗集团江西铜业有限公司
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