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Method for preparing corona-resistant polyamide-imide enameled wire paint

A technology of polyamide-imide and wire enamel, which is applied in the field of wire enamel manufacturing, to achieve the effects of good compatibility, no precipitation and layering, and easy production process

Inactive Publication Date: 2017-06-09
TIANHENGDA ELECTRICAL ENG SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The particle suspension and dispersion state of this method is better, and it is not easy to precipitate and delaminate. However, polyester is used as the base resin of the wire enamel, and the heat resistance needs to be improved.

Method used

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  • Method for preparing corona-resistant polyamide-imide enameled wire paint
  • Method for preparing corona-resistant polyamide-imide enameled wire paint

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Pretreatment of nano-scale inorganic oxide particles; put 4000 grams of water and ethanol mixture (including 2000 grams of water and 2000 grams of ethanol) into a reactor with a stirring device, gradually raise the temperature to 60 ° C, and put 1000 grams of nano Grade titanium dioxide powder, 20 grams of γ-aminopropyltriethoxysilane, stirring for 2-3 hours, and adjusting the pH value to 4-5.5, dehydrating the slurry through a centrifuge and then drying to a water content of less than 0.01 % powder;

[0018] (2) Preparation of polyamide-imide resin solution; in a 30-liter reactor equipped with a stirring device and a reflux condensing device, 2502 grams of diphenylmethane diisocyanate, 1902 grams of trimellitic anhydride, and 13212 grams of methylpyrrolidone were added from When the room temperature rises to 70°C, carbon dioxide bubbles begin to escape, and then the temperature is raised to 190°C at a rate of 15-25°C per hour, and kept for 1-2 hours, the system gra...

Embodiment 2

[0022] (1) Pretreatment of nano-scale inorganic oxide particles; put 4000 grams of water and ethanol mixture (including 2000 grams of water and 2000 grams of ethanol) into a reactor with a stirring device, gradually raise the temperature to 60 °C and put 1000 grams of nano Grade silica powder, 40 grams of vinyl tris (methoxyethoxy) silane, stirred and reacted for 2-3 hours, and after adjusting the pH value to 4-5.5, the slurry was dehydrated by a centrifuge and then dried to Powder with water content less than 0.01%;

[0023] (2) Polyamide-imide resin solution preparation; In a 30-liter reactor equipped with a stirring device and a reflux condensation device, 2,502 grams of diphenylmethane diisocyanate, 1,960 grams of trimellitic anhydride, and 13,386 grams of methylpyrrolidone were added from When the room temperature rises to 70°C, carbon dioxide bubbles begin to escape, and then the temperature is raised to 190°C at a rate of 15-25°C per hour, and kept for 1-2 hours, the sy...

Embodiment 3

[0027](1) Pretreatment of nano-scale inorganic oxide particles; put 4000 grams of water and ethanol mixture (including 2000 grams of water and 2000 grams of ethanol) into a reactor with a stirring device, gradually raise the temperature to 60 ° C, and put 1000 grams of nano Grade aluminum oxide powder, 30 grams of isopropyl tris (dioctyl phosphate acyloxy) titanate, stirred for 2-3 hours, and after the pH value was adjusted to 4-5.5, the slurry was passed through a centrifuge Dehydration and then drying to a powder with a moisture content of less than 0.01%;

[0028] (2) Preparation of polyamide-imide resin solution; in a 30-liter reactor equipped with a stirring device and a reflux condensing device, 2502 grams of diphenylmethane diisocyanate, 1883 grams of trimellitic anhydride, and 13155 grams of methylpyrrolidone were added from When the room temperature rises to 70°C, carbon dioxide bubbles begin to escape, and then the temperature is raised to 190°C at a rate of 15-25°C ...

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Abstract

The invention relates to a wire enamel manufacturing technology, in particular to a preparation method of an enameled wire varnish with high temperature resistance, good corona resistance and flexibility. The method comprises four steps: (1) pretreatment of nanoscale inorganic oxide particles (2) preparation of polyamide-imide resin solution (3) preparation of slurry (4) preparation of corona-resistant polyamide-imide wire enamel. First, the inorganic nano-oxide particles are pretreated with a coupling agent, the second step is to prepare a polyamide-imide resin solution, and the third step is to combine the pretreated nano-scale inorganic oxide particles with the polyamide-imide resin solution In the grinding machine, the slurry is prepared by grinding and dispersing, and finally the slurry is evenly stirred with a general-purpose polyamide-imide wire enamel to obtain a corona polyamide-imide wire enamel. Compared with the prior art, the corona-resistant enameled wire varnish produced by the invention is not easy to precipitate and delaminate, the production process is easy to control, and the lubricity and heat resistance are balanced.

Description

technical field [0001] The invention relates to a wire enamel manufacturing technology, in particular to a preparation method of an enameled wire varnish with high temperature resistance, good corona resistance and flexibility. Background technique [0002] With the development of power electronics technology, various types of electromagnetic coils have increasingly strict requirements on the performance of enameled wires. Especially the frequency conversion motor which has been developed rapidly in recent years has a remarkable energy-saving effect. Compared with the traditional AC induction motor, in addition to energy saving, the variable frequency motor has many advantages, such as the automatic control of the variable frequency speed regulating motor is easier, the failure rate is very low during operation, and the maintenance is convenient. However, for the winding coils of variable frequency motors, the electric field intensity suffered by the inter-turn insulating m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D179/08C09D5/25C09D7/12
CPCC09D179/08C08K2201/011C08L2203/20C08L2205/025C09D7/62
Inventor 谢飞唐杰黄宗祥李忠良宋孝飞
Owner TIANHENGDA ELECTRICAL ENG SCI & TECH CO LTD
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