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Straight welded welding-slag-free wire enamel

A wire coating and welding slag technology, applied in coating, polyurea/polyurethane coating, etc.

Active Publication Date: 2013-09-11
ELANTAS ELECTRICAL INSULATION TONGLING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, the enameled wire coated with polyurethane enameled wire paint in our country will produce welding slag during direct welding, which will cause problems such as "virtual welding". For some electronic products, when soldering on the circuit board, it will hinder the enameled wire from passing through the circuit The small holes on the board cannot be automated and affect production efficiency

Method used

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  • Straight welded welding-slag-free wire enamel
  • Straight welded welding-slag-free wire enamel
  • Straight welded welding-slag-free wire enamel

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Embodiment Construction

[0028] The present invention is further described below in conjunction with example, but not limited thereto. The quantities in the following example formulations all refer to parts by weight.

[0029] 1. Preparation of polyester polyol resin

[0030] 1. See Table 1 for the formula

[0031] Table 1

[0032]

[0033] Abbreviations in Table 1: GL----glycerol, TMP----trimethylolpropane, EG----ethylene glycol, MPG----2-methyl-1,3-propanediol, NPG ----Neopentyl glycol, IPA----isophthalic acid, BC----phthalic anhydride, TBT----butyl titanate.

[0034] 2. Preparation process

[0035] Put in trihydric alcohol, dihydric alcohol, dibasic acid and catalyst, heat up, react at 160°C to 170°C for 1 hour, 170-180°C for 1 hour, 180-190°C for 3 hours, 190-200°C until the acid value is lower than 8mgKOH / g, then add cresol, cool down to 150°C, put in MDI in batches (guaranteed at 150-155°C), keep warm at 150-155°C for 1 hour, add solvent, stir at 90-100°C for 4 hours, and dilute .

[...

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Abstract

The invention relates to a preparation method for straight welded welding-slag-free polyurethane wire enamel. The polyurethane wire enamel is synthesized from a polyester polyol resin, a polyurethane encapsulation resin, a solvent and a catalyst, wherein the usage amounts of the polyester polyol resin and the polyurethane encapsulation resin are determined according to a ratio of an enclosed isocyanate group to a hydroxyl group, the weight ratio of the enclosed isocyanate group to the hydroxyl group is 1.0 to 1.6, the solvent comprises one or more selected from the group consisting of methylphenol, xylenol, phenol, solvent naphtha and xylene, the catalyst comprises one selected from the group consisting of zinc isoocatanoate, dibutyltin dilaurate and catalyst 576, and the weight of the catalyst accounts for 1 to 5% of solids of the wire enamel. After the polyurethane wire enamel prepared in the invention is coated over an enamelled wire, welding slag is not generated during soldering.

Description

[0001] This application is a divisional application with the application number: 201110154590.X and the filing date: June 9, 2011. technical field [0002] The invention relates to a preparation method of wire enamel, in particular to a preparation method of polyurethane wire varnish for direct welding without welding slag. Background technique [0003] Enameled wire is an essential material for electrical and electronic products. At present, according to the type of conductor, enameled wire includes copper enameled wire, aluminum enameled wire, copper-clad aluminum enameled wire, etc. No matter what kind of enameled wire, it must use enameled wire enamel as the insulating layer. [0004] Polyurethane wire enamel has direct solderability, which is not found in other enameled wire enamel, that is, when the enameled wire coated with it is to be soldered, it can be directly soldered without removing the paint film. This is a unique property of polyurethane structure. Under high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/06C08G18/78C08G18/42C08G63/20
Inventor 周一波
Owner ELANTAS ELECTRICAL INSULATION TONGLING
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