Preparation method of black polyamide-imide coating and coating thereof, enameled wire

A polyamide-imide, polyamide-imide resin technology, applied in coatings, plastic/resin/wax insulators, organic insulators, etc., can solve the problem of poor black coloring effect, poor heat resistance, and unsatisfactory hue. Production requirements, etc.

Active Publication Date: 2021-10-26
苏州东特绝缘科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The black pigment used in traditional black polyamide-imide coatings has poor heat resistance. In subsequent processing, the pigment is easily decomposed by heat, the black coloring effect is poor, and the hue cannot meet the actual production needs.
However, the currently commercially available black pigments with good heat resistance usually produce a large number of pinholes and particle precipitation on the surface of the prepared enameled wire.
Pinholes and particles can easily lead to a decrease in the electrical properties of the enameled wire, and in severe cases, it will cause a short circuit in the enameled wire

Method used

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  • Preparation method of black polyamide-imide coating and coating thereof, enameled wire
  • Preparation method of black polyamide-imide coating and coating thereof, enameled wire
  • Preparation method of black polyamide-imide coating and coating thereof, enameled wire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A kind of preparation method of black polyamide-imide paint, comprises the steps:

[0036] Add 2g carbon black, 60g N-methylpyrrolidone in the homogenizer, then grind 2h under rotating speed 3000rpm, then add 360g polyamideimide resin solution (polyamideimide resin solid content 30wt%), then heat up to 60 degrees Celsius, and then ultrasonically stirred and dispersed for 2 hours, wherein the ultrasonic frequency was 25 kHz, and then ground at a heating temperature of 60 degrees Celsius with a grinding wheel at a speed of 8000 rpm and a linear speed of 40 m / s for 2 hours. Filter with a 200-mesh filter screen to obtain a black polyamide-imide paint.

[0037] The preparation method of enameled wire, it comprises the steps:

[0038] Use a mold to coat the above-mentioned black polyamide-imide paint on the ∮0.4mm copper wire. The number of coats is 8 times, and it can be recoated several times. Place it in a 3.8m baking oven for baking. The inlet and outlet temperatures we...

Embodiment 2

[0040] A kind of preparation method of black polyamide-imide paint, comprises the steps:

[0041] Add 5g carbon black, 80g N-methylpyrrolidone in the homogenizer, then grind 2h under rotating speed 3000rpm, then add 360g polyamideimide resin solution (polyamideimide resin solid content 36wt%), then heat up to 60 degrees Celsius, and then ultrasonically stirred and dispersed for 1.5 hours, wherein the ultrasonic frequency was 23 kHz, and then ground at a heating temperature of 80 degrees Celsius at a speed of 8000 rpm and a linear speed of 40 m / s for 2 hours. Filter with a 200-mesh filter screen to obtain a black polyamide-imide paint.

[0042]Use a mold to coat the above-mentioned black polyamide-imide paint on the ∮0.4mm copper wire. The number of coats is 8 times, and it can be re-coated several times. Place it in a 3.8m baking furnace for baking. The inlet and outlet temperatures were 440 and 480 degrees Celsius respectively, the baking time was 1 minute, and the moving li...

Embodiment 3

[0044] A kind of preparation method of black polyamide-imide paint, comprises the steps:

[0045] Add 10g carbon black, 98g N-methylpyrrolidone in the homogenizer, then grind 2h under rotating speed 3000rpm, then add 400g polyamideimide resin solution (polyamideimide resin solid content 33wt%), then heat up to 70 degrees Celsius, and then ultrasonically stirred and dispersed for 1.5 hours, wherein the ultrasonic frequency was 23kHz, and then 40g of polyamic acid resin solution (polyamic acid resin solid content 30wt%) was added, and then at a heating temperature of 70 degrees Celsius, at a speed of 8000rpm, 40m / s line speed grinding for 2.5 hours. Filter with a 200-mesh filter screen to obtain a black polyamide-imide paint.

[0046] The preparation method of enameled wire, it comprises the steps:

[0047] Use a mold to coat the above-mentioned black polyamide-imide paint on the ∮0.4mm copper wire. The number of coats is 8 times, and it can be re-coated several times. Place ...

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Abstract

The invention discloses a preparation method of a black polyamide-imide coating, the coating and the enameled wire. Wherein, the black polyamide-imide paint comprises the following raw materials: 360-400 parts by mass of polyamide-imide resin solution, 2-10 parts by mass of black pigment and 60-100 parts by mass of amide organic solvent, and the black pigment is selected from From carbon black or reactive black. Carbon black or active black with good heat resistance is added to the black polyamide-imide paint as black pigment, and the proportion of each component is reasonable, which is indispensable. The active groups in the above black pigments can react with the polyamideimide resin in the polyamideimide resin solution to form a stable covalent bond, which is not easily destroyed under high temperature conditions. Black polyamide-imide coating with black pigment, which will not decompose at high temperature and has good coloring performance.

Description

technical field [0001] The invention relates to the technical field of insulating coatings, in particular to a preparation method of a black polyamide-imide coating, the coating, and an enameled wire. Background technique [0002] Black polyamide-imide paint is an insulating paint with excellent mechanical and electrical properties. The heat resistance grade is 220. Because of its high heat resistance temperature, it is mainly used for coil production of electric tools with high heat resistance. . In the manufacturing process of winding coils of motors and electrical appliances, it is often necessary to distinguish and connect different types of winding coils. Therefore, enameled wires of different hues are often used to distinguish lines, thereby reducing errors in coil connection and improving coil production efficiency. [0003] The black pigments used in traditional black polyamide-imide coatings have poor heat resistance. In subsequent processing, the pigments are easi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D179/08C09D7/61C09D7/20C09D5/25H01B3/30
CPCC09D179/08C09D7/20C09D7/61H01B3/303H01B3/308C08K3/04
Inventor 姚晓刚王恩来陈言臣邹春旺奚寅春王文杰
Owner 苏州东特绝缘科技有限公司
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