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High thermal grade non-pinhole rapid direct welding polyurethane enameled wire insulation varnish and preparation method thereof

A polyurethane paint, pinhole-free technology, applied in the coating and other directions, can solve the problems of reduced straight weldability, poor heat resistance, and reduced salt water pinhole characteristics of enameled wires, and achieves good direct weldability and flue loss. Less and better characteristics

Inactive Publication Date: 2011-12-14
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

[0003] However, polyurethane enameled wire also has significant disadvantages, that is, its poor heat resistance. In order to improve its heat resistance, high temperature resistant groups can be introduced to improve heat resistance, but this significantly reduces its direct solderability. And reduce the salt water pinhole resistance of the enameled wire

Method used

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  • High thermal grade non-pinhole rapid direct welding polyurethane enameled wire insulation varnish and preparation method thereof
  • High thermal grade non-pinhole rapid direct welding polyurethane enameled wire insulation varnish and preparation method thereof
  • High thermal grade non-pinhole rapid direct welding polyurethane enameled wire insulation varnish and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Take 20 parts of polyester resin, add 50 parts of blocked isocyanate resin (two-step synthesis, MDI brand is Yantai Wanhua's MDI-50), add 15 parts of xylene, 10 parts of m-cresol, 5 parts Stir with n-butanol for 3 hours, discharge and filter when the temperature is lowered to 45°C, and make a polyurethane enameled wire with a solid content of 30% polyurethane paint to produce a thick paint film.

Embodiment 2

[0043] Take 20 parts of polyester resin, add 50 parts of blocked isocyanate resin (two-step synthesis, MDI brand is HUNTSMAN's SUPRASEC 3051), add 15 parts of xylene, 10 parts of m-cresol, 5 parts of n-butyl when the kettle temperature is 70 °C Stir with alcohol for 3 hours, discharge and filter when the temperature is lowered to 45°C, and make a polyurethane enameled wire with a solid content of 30% polyurethane paint to produce a thick paint film.

Embodiment 3

[0045] Take 20 parts of polyester resin, add 50 parts of blocked isocyanate resin (two-step synthesis, MDI brand is BAYER's DESMODUR 2460M), add 15 parts of xylene, 10 parts of m-cresol, 5 parts of n-butyl when the temperature of the kettle is 70 °C Stir with alcohol for 3 hours, discharge and filter when the temperature is lowered to 45°C, and make a polyurethane enameled wire with a solid content of 30% polyurethane paint to produce a thick paint film.

[0046] Preparation of enameled wire sample wire:

[0047] Coating equipment: Meda QHW 4 / 1

[0048] Process parameters:

[0049] Oven inlet: 350°C; Middle oven: 380°C; Oven outlet: 420°C; Circulation fan: 1000RPM; Exhaust fan: 800RPM;

[0050] Speed: 115 m / min

[0051] Paint passes: 7

[0052] The enameled wire specification is 0.20mm.

[0053] The following table is comparative example and embodiment performance test list:

[0054] Comparative example 1 Comparative example 2 Comparative example 3 Com...

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Abstract

The invention relates to a high-heat-grade non-pinhole rapid direct welding polyurethane enameled wire insulating varnish and a preparation method thereof. The preparation method comprises: the preparation of polyester resin; using TMP, MDI, phenol or m-cresol to synthesize blocked isocyanic acid resin in two steps; Cyanic acid resin, 15 parts by weight of xylene, 10 parts by weight of phenol, and 5 parts by weight of n-butanol are mixed and painted at 60-70°C to form a high-heat level non-pinhole fast direct-welding polyurethane enameled wire insulating varnish. The produced enameled wire has high heat resistance, the thermal class can reach 180, the softening breakdown is above 230°C, and the hot shock temperature is 200°C (the test method refers to IEC60851); it can be directly welded at 330°C, and there is no residue after direct welding; Kneading and stretching salt water pinholes in water; the flue loss in the oven is relatively small, and there is no obvious cracking product on the surface of the enameled wire. When using this product to manufacture enameled wire, the process margin is wide, which facilitates the realization of robust process production.

Description

technical field [0001] The invention relates to a polyurethane enameled wire insulating varnish, in particular to a high-heat level non-pinhole fast direct welding polyurethane enameled wire insulating varnish and a preparation method thereof. Background technique [0002] Polyurethane enameled wire insulating varnish introduces carbamate groups on the basis of polyester paint. Since carbamate groups can decompose at high temperature, the enameled wires can be directly welded without removing the paint film in advance. The production process is greatly simplified, and the polyurethane enameled wire has the characteristics of low dielectric loss at high frequencies, so it has been widely used in various electronic components. [0003] However, polyurethane enameled wire also has significant disadvantages, that is, its poor heat resistance. In order to improve its heat resistance, high temperature resistant groups can be introduced to improve heat resistance, but this signific...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/06C09D5/25C08G63/20C08G18/80
Inventor 涂张应张俊
Owner 上海晟然绝缘材料有限公司
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