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Preparation method of polyester imide enamelled wire insulating varnish

A technology of enameled wire insulation and polyesterimide, applied in the direction of coating, etc., can solve the problems of vibration reduction, noise reduction, impact resistance, etc., achieve good vibration reduction and noise reduction effect, improve elasticity and toughness, and high impact resistance Effect

Inactive Publication Date: 2018-01-19
铜陵市永创变压器电子有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main variety of existing enameled wire insulating varnish is polyester imide, which still has great deficiencies in vibration reduction, noise reduction and impact resistance. Therefore, it is necessary to make improvements

Method used

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Embodiment Construction

[0017] A preparation method of polyester imine enameled wire insulating varnish includes the following steps:

[0018] (1) Mix the disodium hydrogen phosphate aqueous solution and the calcium chloride aqueous solution at a volume ratio of 1:1 to obtain a mixed solution, adjust the pH to 9 with ammonia water, stand for 2h, and then add 1% of the weight of the mixed solution Ammonium bicarbonate, spray-dried to obtain porous hydroxyapatite;

[0019] (2) Add the porous hydroxyapatite obtained in step (1) to water and ultrasonically disperse uniformly to obtain a porous hydroxyapatite suspension with a solid content of 3%, and then combine the porous hydroxyapatite suspension with a solid content of 20% styrene butadiene rubber latex is mixed uniformly in a volume ratio of 1:0.5, and then centrifugal spray drying is performed using a centrifugal spray dryer to obtain porous hydroxyapatite-styrene butadiene rubber hybrid powder;

[0020] (3) Add 5 parts by weight of the porous hydroxyapa...

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Abstract

The invention discloses a preparation method of polyester imide enamelled wire insulating varnish. The preparation method comprises the following steps: firstly, taking calcium chloride and sodium hydrogen phosphate as raw materials, taking ammonium bicarbonate as a pore-foaming agent and carrying out spray drying to obtain porous hydroxyapatite; secondly, dispersing the porous hydroxyapatite intowater to obtain porous hydroxyapatite suspension, mixing the porous hydroxyapatite suspension with styrene-butadiene latex, and carrying out centrifugal spray drying by using a centrifugal spray drier to obtain porous hydroxyapatite-butadiene styrene rubber hybrid powder; finally, mixing the porous hydroxyapatite-butadiene styrene rubber hybrid powder with polyester imide resin and carrying out high-temperature reaction in an organic solvent, thus obtaining the polyester imide enamelled wire insulating varnish. The polyester imide enamelled wire insulating varnish prepared by the preparationmethod disclosed by the invention has the advantages of high impact resistance, good mechanical performance and high insulation reliability; in addition, the polyester imide enamelled wire insulatingvarnish has good effects of vibration reduction and noise reduction.

Description

Technical field [0001] The invention relates to the technical field of transformer insulating varnishes, in particular to a preparation method of polyesterimide enameled wire insulating varnishes. Background technique [0002] With the continuous improvement of the national economy and the continuous and rapid growth of power demand, transformers, as an extremely important power transmission and transformation equipment in the power system, have also put forward higher requirements for their insulation reliability. The main function of enameled wire insulating varnish is to improve the dielectric strength and insulation resistance of the transformer insulation system, so as to meet the electrical insulation performance requirements of the transformer. The working principle of the transformer is to perform alternating voltage through electromagnetic induction. When the load current passes through the coil winding, the magnetic leakage generated by the load current causes the vibra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D179/08C09D5/25C09D7/61C09D7/65
Inventor 姚永红
Owner 铜陵市永创变压器电子有限公司
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