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Method of coating a square wire and an insulated wire of a square wire

Inactive Publication Date: 2006-10-05
NIPPON PAINT CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0009] In view of the above-mentioned circumstances, it is an object of the present invention to provide a method of coa

Problems solved by technology

However, in the case of an insulated wire obtained by applying the above-mentioned conventional insulating coating or electrocoating to a square wire, the film thickness of an insulating film formed on the edges becomes thin; consequently, an insulated wire having an adequate insulating property may not be attained.
Moreover, when the electric wire of a square wire is applied, it becomes possible to improve the occupancy ratio because of its shape; however, when an insulating film is formed on the square wire by using a conventional insulating coating or electrocoating, the film thickness tends to become uneven between on edges and flat portions other than the edges, with the result that the film thickness of the insulating film formed on the edges becomes thin; consequently, the cross-sectional profile of the resulting insulated wire becomes different from the cross-sectional profile (square shape) of the article to be coated, resulting in a failure in improving the occupancy ratio.
In the case when a square wire is used as an article to be coated, another problem that pinholes tend to occur particularly in the electrodeposition arises.
When pinholes occur in the electrodeposited film, there is the possibility of deterioration in the insulating property.

Method used

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  • Method of coating a square wire and an insulated wire of a square wire
  • Method of coating a square wire and an insulated wire of a square wire
  • Method of coating a square wire and an insulated wire of a square wire

Examples

Experimental program
Comparison scheme
Effect test

production example 1

Production of an Acrylic Resin 1 having an Epoxy Group

[0219] Butyl cellosolve (120 parts) was put in a reaction container and heated under stirring at 120° C. A mixed solution of 2 parts of tert-butylperoxy-2-ethylhexanoate and 10 parts of butyl cellosolve, and a monomer mixture consisting of 40 parts of glycidyl methacrylate, 150 parts of 2-ethylhexyl methacrylate, 50 parts of 2-hydroxyethyl methacrylate and 65 parts of n-butyl methacrylate were added dropwise thereto over 3 hours. This mixture was aged for 30 minutes and, then, a mixed solution of 0.5 part of tert-butylperoxy-2-ethylhexanoate and 5 parts of butyl cellosolve was added dropwise thereto over 30 minutes. Further, the resulting mixture was aged for 2 hours to obtain the solution of an acrylic resin 1 having an epoxy group with a non-volatile content of 42%. The number-average molecular weight, measured by gel permeation chromatography (GPC) in terms of polystyrene, of this acrylic resin 1 having an epoxy group was 110...

production example 2

Production of an Ammonium Quaternizing Agent 1

[0220] Isophorone diisocyanate (220 parts), 40 parts of methyl isobutyl ketone and 0.22 part of dibutyltin dilaurate were put in a reaction container, and 135 parts of 2-ethylhexanol was added dropwise thereto at 55° C. Thereafter, the mixture was reacted at 60° C. for 1 hour to obtain a half-blocked isocyanate solution. This solution was further heated to 80° C. and a mixed solution of 90 parts of N,N-dimethylaminoethanol and 10 parts of methyl isobutyl ketone was added dropwise thereto over 30 minutes. After recognizing that an isocyanate group disappeared using infrared spectrum analysis, the mixed solution was cooled to room temperature to obtain tertiary amine having a blocked isocyanate group. This solution was neutralized by adding 180 parts of a 50% aqueous solution of lactic acid to obtain a solution of an ammonium quaternizing agent 1.

production example 3

Production of an Ammonium Quaternizing Agent 2

[0221] A solution of an ammonium quaternizing agent 1 was obtained by following the same procedure as in Production Example 2 except for using 160 parts of triethylene glycol monomethyl ether in place of 135 parts of 2-ethylhexanol used as a block agent and changing the amount of methyl isobutyl ketone as a solvent from 40 parts to 25 parts.

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Abstract

An insulated square wire that has a high dielectric breakdown voltage is prepared by coating a square wire by cationic electrodeposition on a square wire to form an insulating film thereon, by application of a cationic electrocoating from an electrocoating bath, wherein the shifting speed of the square wire in the electrocoating bath is set in a range from 1 to 80 m / min; the shortest distance from a liquid-contact portion of the square wire onto the cationic electrocoating to an electrode is et longer than 1 / 2 of the total shift distance of the square wire from the liquid-contact portion of the square wire to a liquid-separation portion in the electrocoating bath, the cationic electrocoating contains a resin composition of which a hydratable functional group is reduced directly by electrons and passivated, resulting in deposition of a film, and the cationic electrocoating contains crosslinked resin particles.

Description

TECHNICAL FIELD [0001] The present invention relates to a method of coating a square wire and an insulated wire of such a square wire. BACKGROUND ART [0002] Insulated wires have been in wide use in the application areas such as electric and electronic equipment. These insulated wires generally have a structure in that an insulating film for protection and an enamel wire obtained by coating and baking an insulating coating containing organic resins such as various synthetic resins or natural resins is widely used. [0003] As an insulating coating, insulating coatings formed by containing polyvinyl formal resin, polyurethane resin, polyester resin, polyester-imide resin, polyamide-imide resin or polyimide resin are generally used widely. In addition, preparation of an insulated wire is widely performed by elecrodeposition using elecrocoatings which have been previously used widely, and a round wire, which has a round shape in the cross-sectional profile, having an insulating film forme...

Claims

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Application Information

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IPC IPC(8): C25D11/00C25D5/00C09D5/44C09D163/04C25D13/16H01B3/44H01B13/06H01B13/16
CPCC09D5/4411C09D5/4442C09D5/4492H01B13/16C25D13/16H01B3/447H01B13/065C09D163/04
Inventor KAWANAMI, TOSHITAKASAKAMOTO, HIROYUKITANAKA, HIDENORIMORICHIKA, KAZUOSAITOGOTO, YOSHIHIDEGOTO, TAIKI
Owner NIPPON PAINT CO LTD