Preparation method of self-lubricating PAI (polyamide-imide) enameled wire paint

A technology of polyamide-imide and enameled wire varnish, which is applied in the direction of coating to achieve the effect of both heat resistance and flexibility

Inactive Publication Date: 2017-05-31
TIANHENGDA ELECTRICAL ENG SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In practice, the above-mentioned various methods still have some deficiencies at present, such as the influence on heat resistance, the compatibility of the paint liquid and the phenomenon of solid stratification after the lubricating component is added, etc. also need to be improved.

Method used

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  • Preparation method of self-lubricating PAI (polyamide-imide) enameled wire paint
  • Preparation method of self-lubricating PAI (polyamide-imide) enameled wire paint

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The first step: Put 2503 grams of diphenylmethane diisocyanate, 1537 grams of trimellitic anhydride, and 332 grams of isophthalic acid into a 40-liter reactor equipped with a stirring device and a reflux condensing device, and the molar ratio is 1:0.8 :0.2, add solvent methylpyrrolidone (NMP) 15302 grams, the mass ratio of raw material and solvent is 1:3.5. Raise from room temperature to 70-80°C, keep warm for 1-2 hours, then raise the temperature by 15--25°C per hour to make the reaction run smoothly, raise the temperature to 190°C, keep warm for 1-2 hours, the system gradually becomes transparent , in orange, to obtain a low-viscosity polyamide-imide (PAI) prepolymer solution;

[0018] Step 2: Take 10kg of the low-viscosity polyamideimide (PAI) prepolymer solution and 2kg of nano-scale polytetrafluoroethylene (PTFE) powder in the first step, and grind and disperse them in a nano-scale ball mill. The grinding and dispersing time is 4- After 5 hours, a dispersion liqui...

Embodiment 2

[0021] 2503 grams of diphenylmethane diisocyanate, 1729 grams of trimellitic anhydride, and 166 grams of isophthalic acid were put into a 40-liter reactor equipped with a stirring device and a reflux condensing device, and the molar ratio was 1:0.9:0.1. The solvent methylpyrrolidone (NMP) is 15393 grams, and the mass ratio of raw material to solvent is 1:3.5. All the other operations are the same as in Example 1.

[0022] Test items Comparative example Example 1 Example 2 Conductor diameter / mm 0.101 0.101 0.102 Enameled wire outer diameter / mm 0.120 0.121 0.119 surface smooth without bright spots smooth without bright spots smooth without bright spots dynamic friction coefficient 0.092042 0.043793 0.046143 Thermal shock (Test temperature 280±5°C, 30min, round rod diameter 2D) No cracking under test conditions (310±5°C, 30min, round rod diameter 2D) no cracking under test conditions (310±5°C, 30min, round rod diameter 2...

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Abstract

The invention relates to a preparation method of a self-lubricating PAI (polyamide-imide) enameled wire paint. The preparation method of the self-lubricating PAI enameled wire paint uses the characteristics of being excellent in high-and-low temperature performance and chemical stability, good in electrical insulating property, non-adhesive performance and weather resistance, incombustible and good inn lubricity of PTFE (polytetrafluroethylene) for modifying PAI so as to improve lubricity of the PAI. Simultaneously, a low viscosity PAI prepolymer solution is prepared, PTFE nanometer powder is dispersed in the low viscosity PAI prepolymer solution through a ball milling and sanding mode, dispersity of the PTFE nanometer powder is improved, and dispersion liquid obtained after above dispersion operation is finished is placed in a reactor to be heated for reaction so as to improve the molecular weight of the dispersion liquid. The dispersion liquid containing the PTFE powder is added in sold or universal PAI enameled wire paint to obtain a mixture, and then the self-lubricating PAI enameled wire paint is obtained. An enameled wire prepared from the self-lubricating PAI enameled wire paint has better lubricity than a common PAI enameled wire, and scratching problems of the enameled wire in the winding process of a high speed winding machine are solved.

Description

technical field [0001] The invention relates to a wire enamel manufacturing technology, in particular to a preparation method of a wire enamel with high temperature resistance, good self-lubricating performance and softness. The self-lubricating polyamide-imide wire enamel prepared by the method can be used to manufacture high-temperature Performance Self-lubricating composite enameled wire, which can be widely used in motors, electrical appliances, transformers, especially magnetic ring coils as winding wires. Background technique [0002] With the development of power electronics technology, all kinds of electromagnetic coils have increasingly strict requirements on the performance of enameled wires. Especially in the high-speed winding process of fine enameled wire coils, on the one hand, enameled wires are required to have a paint film with high temperature resistance. Good self-lubrication and flexibility. Among the existing enameled wire varieties, polyamide-imide enam...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D179/08C09D127/18C08G73/14
CPCC09D179/08C08G73/14C08L2203/202
Inventor 谢飞唐杰黄宗祥宋孝飞
Owner TIANHENGDA ELECTRICAL ENG SCI & TECH CO LTD
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