Preparation method for self-lubricating polyamide-imide enamelled wire insulated paint synthesized by grafting polymerization

A polyamide-imide and enameled wire insulation technology, applied in the chemical field, can solve the problems of unusable, environmental pollution, poor heat resistance, etc., and achieve the effect of stable process production, wide process margin and long storage period

Inactive Publication Date: 2013-02-20
上海晟然绝缘材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since lubricants must be dissolved in hydrocarbon solvents (concentration is roughly 0.5 to 2%), these solvents will naturally volatilize into the air after coating, causing serious waste of resources and causing environmental pollution; and due to paraffin lubricants and new Refrigerants are not compatible, so they cannot be used in refrigerator compressors, and polyester or oil-based lubricants do not lubricate well;
[0006] (2) Coating aliphatic nylon on the surface of the enameled wire to improve the surfa

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] First, take N-methylpyrrolidone (NMP) as a solvent, dissolve stearic acid therein, and make a stearic acid solution with a concentration of 10%;

[0033] Second, add the stearic acid solution into hexamethylene diisocyanate (HDI trimer) by spraying method, stir rapidly and gradually raise the temperature to 100-150°C to make intermediate A, wherein HDI trimer The molar ratio of stearic acid to stearic acid is 1:1~1:0.9, and the equivalent ratio of free NCO in intermediate A to NCO in MDI is controlled to be 1:3, and they are added to trimellitic anhydride to control the two The molar ratio of two functional groups (-COO, -COOH) is 1:1 ~ 1:1.05. Stir slowly at a kettle temperature of 70°C for 2.5 hours, raise the temperature to 120°C and stir rapidly for 3.5 hours, add xylene to synthesize graft polymerization Self-lubricating polyamideimide enameled wire insulating varnish.

[0034] Use ordinary polyesterimide enameled wire varnish as the primer (such as 588 / 40G of Sha...

Embodiment 2

[0036] Similar to Example 1, stearic acid is used to synthesize control intermediate A according to the method of the present invention, and the equivalent ratio of free NCO and MDI in the control intermediate A to NCO is 1:2, and other grafts are synthesized according to the method of the present invention Self-lubricating polyamide-imide enameled wire insulating varnish by polymerization method.

[0037] Use ordinary polyesterimide enameled wire varnish as the primer (such as 588 / 40G of Shanghai Shengran Insulation Material Co., Ltd.); the intermediate paint is polyamide-imide varnish (such as 338 / 35 of Shanghai Shengran Insulation Material Co., Ltd.) ; The surface layer is the self-lubricating polyamideimide enameled wire insulating varnish synthesized by the above graft polymerization method, and one layer is applied to make a three-coat composite wire (bottom layer: middle layer: surface layer = 80:15:5).

Embodiment 3

[0039] Similar to Example 1, stearic acid is used to synthesize control intermediate A according to the method of the present invention, and the equivalent ratio of free NCO and MDI in the control intermediate A to NCO is 1:5, and other grafts are synthesized according to the method of the present invention Self-lubricating polyamide-imide enameled wire insulating varnish by polymerization method.

[0040] Use ordinary polyesterimide enameled wire varnish as the primer (such as 588 / 40G of Shanghai Shengran Insulation Material Co., Ltd.); the intermediate paint is polyamide-imide varnish (such as 338 / 35 of Shanghai Shengran Insulation Material Co., Ltd.) ; The surface layer is the self-lubricating polyamideimide enameled wire insulating varnish synthesized by the above graft polymerization method, and one layer is applied to make a three-coat composite wire (bottom layer: middle layer: surface layer = 80:15:5).

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PUM

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Abstract

The invention relates to a preparation method for a self-lubricating polyamide-imide enamelled wire insulated paint synthesized by grafting polymerization. The method comprises the steps of preparing an aliphatic acid or alcohol with a long chain alkyl into a solution with a concentration of 10% by using N-methyl pyrrolidone as a solvent; adding the solution to hexamethylene diisocyanate with a spraying method; stirring rapidly and heating to a temperature of 100-150 DEG C gradually to obtain an intermediate A; adding the intermediate A and diphenylmethane diisocyanate together into trimellitic anhydride with a molar ratio of free -NCO in the intermediate A to that in diphenylmethane diisocyanate being 1 : 1-1 : 5; controlling the molar ratio of -NCO to two functional groups in trimellitic anhydride being 1 : 1-1 : 1.05; stirring for 2.5 hours slowly at a kettle temperature of 70 DEG C; heating to a temperature of 120 DEG C; fast stirring for 3.5 hours; and adding dimethylbenzene to make the self-lubricating polyamide-imide enamelled wire insulated paint. The self-lubricating polyamide-imide enamelled wire insulated paint has long quality guarantee period, and does not appear layering. The static friction coefficient can be lower than 0.06. Risks that the enamelled wire is scratched during the processes of winding coils, embedding wires and shaping can be decreased.

Description

Technical field [0001] The invention relates to a preparation method for synthesizing self-lubricating polyamide-imide enameled wire insulating varnish by graft polymerization, belonging to the field of chemistry. Background technique [0002] The composite enameled wire made of polyesterimide composite polyamideimide has a thermal class of 200 and has excellent comprehensive performance. It has been widely used in sealed motors, electric tools, and other high heat-resistant motors and electrical appliances. [0003] With the widespread use of automatic high-speed winding and automatic wire embedding and shaping, the production efficiency has been greatly improved, and at the same time, higher requirements have been put forward for the performance of enameled wire, especially the surface lubricity. The enameled wire with poor surface lubricity has large resistance during high-speed winding, unstable winding tension, easy to break, and the wound wire package is large or i...

Claims

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Application Information

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IPC IPC(8): C09D179/08C09D5/25C08G73/14
Inventor 邵武军
Owner 上海晟然绝缘材料有限公司
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