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A class B heat-resistant polyvinyl formal enameled wire insulating varnish and preparation method thereof

A technology of polyvinyl formal and polyvinyl formal resin, which is applied in coatings, epoxy resin coatings, etc., can solve the problems of low heat resistance level and limited popularization and application, achieve high heat resistance level, improve resistance The effects of heat and good physical and chemical technical indicators

Active Publication Date: 2020-03-31
江苏佳禾电子材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Polyvinyl acetal wire enamel is the first polymer insulating material synthesized artificially in the world for the first time. It was put on the market by Germany and the United States in 1930, and it was successfully developed in my country in the 1960s. ) has excellent oil and water resistance, and is widely used in the production of oil-immersed transformer winding coils, but due to its low heat resistance level (105-120 ° C, E-level), the further promotion and application of this variety of enameled wire is limited, and so far Similar products with higher heat resistance (130°C and above) have not been put on the market

Method used

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  • A class B heat-resistant polyvinyl formal enameled wire insulating varnish and preparation method thereof
  • A class B heat-resistant polyvinyl formal enameled wire insulating varnish and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Preparation of class B heat-resistant polyvinyl formal enameled wire insulating varnish:

[0025] (1) Add 225 parts of cresol, 270 parts of xylene, and 253.8 parts of furfural into the reactor by weight, stir and mix evenly, and make mixed solvent A;

[0026] (2) Take 670.4 parts of mixed solvent A according to the weight ratio, add it to the reaction kettle and stir evenly, heat up to 45°C, gradually add 135 parts of polyvinyl formal resin (PVF) in batches, stir after the addition and heat up to 80°C , keep warm for 3 hours, until the polyvinyl formal resin is completely dissolved, and the semi-finished product B is obtained;

[0027] (3) Take 16.2 parts of mixed solvent A according to the weight ratio and add it to a reaction kettle with a stirrer, add 16.2 parts of 704 epoxy resin, stir evenly and heat up to 60°C, keep it warm for 2 hours, stir until the resin is completely dissolved, and get a semi-finished product C ;

[0028] (4) Take 50.4 parts of mixed solvent...

Embodiment 2

[0034] Preparation of class B heat-resistant polyvinyl formal enameled wire insulating varnish:

[0035] (1) Add 247.7 parts of cresol, 247 parts of xylene, and 247 parts of furfural into the reaction kettle by weight, stir and mix evenly, and make mixed solvent A;

[0036] (2) Take 668.6 parts of mixed solvent A according to the weight ratio, add it to the reaction kettle and stir evenly, heat up to 50°C, gradually add 135 parts of polyvinyl formal resin (PVF) in batches, stir again after adding, and heat up to 85°C , heat preservation for 2.5h, until the polyvinyl formal resin is completely dissolved, and the semi-finished product B is obtained;

[0037] (3) Take 13.5 parts of mixed solvent A according to the weight ratio and add it to the reaction kettle with agitator, add 13.5 parts of 704 epoxy resin, stir evenly and heat up to 65 ° C, keep it warm for 2 hours, stir until the resin is completely dissolved, and get a semi-finished product C;

[0038] (4) Take 44.1 parts ...

Embodiment 3

[0044] (1) By weight ratio, 265 parts of cresol, 220 parts of xylene, and 249.7 parts of furfural were added to the reaction kettle, stirred and mixed evenly, and mixed solvent A was made;

[0045] (2) According to the weight ratio, take 66.6 parts of mixed solvent A66.6 into the reaction kettle and stir evenly, heat up to 55°C, gradually add 135 parts of polyvinyl formal resin (PVF) in batches, and then stir and heat up to 90°C, keep warm for 2 hours, until the polyvinyl formal resin is completely dissolved, and the semi-finished product B is obtained;

[0046] (3) Take 10.8 parts of mixed solvent A according to the weight ratio and add it to a reaction kettle with a stirrer, add 10.8 parts of 704 epoxy resin, stir evenly and heat up to 70°C, keep warm for 1.5h, stir until the resin is completely dissolved, and get semi-finished product C;

[0047] (4) Take 37.8 parts of mixed solvent A according to the weight ratio and add it to a reaction kettle with a stirrer, add 16.2 pa...

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Abstract

The invention discloses a B grade heatproof polyvinyl formal enameled wire insulating paint and a preparation method thereof. The insulating paint is mainly prepared from a semi-finished product B, a semi-finished product C, a semi-finished product D, a semi-finished product E, a polyester-imide insulating paint, and a leveling agent diluent; wherein the semi-finished product B is prepared from a mixed solvent A and vinyl formal resin; the semi-finished product C is prepared from the mixed solvent A and 704 epoxy resin; the semi-finished product D is prepared from the mixed solvent A and 609 epoxy resin; the semi-finished product E is prepared from mixed solvent A and heatproof boron phenolic resin; and the mixed solvent A is prepared from cresol, xylene, and furfural. The heatproof grade of a conventional polyvinyl formal enameled wire paint is improved, the heatproof grade can reach 130 DEG C, the performances of original paint are maintained at the same time; the preparation method is safe, reliable, simple and convenient, the cost is low, the raw materials are abundant; and the reliability of electrical operation of electric transmission and transformation equipment is enhanced.

Description

technical field [0001] The invention belongs to the technical field of fine chemicals, and in particular relates to a (130° C.) B-grade heat-resistant polyvinyl formal enameled wire insulating varnish with good heat resistance and a preparation method thereof. Background technique [0002] Polyvinyl acetal wire enamel is the first polymer insulating material synthesized artificially in the world for the first time. It was put on the market by Germany and the United States in 1930, and it was successfully developed in my country in the 1960s. ) has excellent oil and water resistance and is widely used in the production of oil-immersed transformer winding coils. However, due to its low heat resistance level (105-120 ° C, E-level), the further promotion and application of this variety of enameled wire is limited. Similar products with higher heat resistance (130°C and above) have not been put on the market. Contents of the invention [0003] Purpose of the invention: Aiming at...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D129/14C09D163/00C09D179/00C09D5/25C09D7/65
CPCC08L2201/08C08L2203/202C08L2205/025C08L2205/035C09D5/00C09D129/14C08L63/00C08L61/14C08L79/00
Inventor 王成宜陈永凤
Owner 江苏佳禾电子材料有限公司
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