KR930002938B1 - Collected insulating wire - Google Patents

Abstract

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Description

Assembly insulated wire

1 is a schematic cross-sectional view of a group of insulated wires, in accordance with the present invention.

2 is a schematic cross-sectional view of one variation of the aggregated insulated wire of FIG. 1.

The present invention relates to an aggregated insulated wire in which an aggregate is formed by coating a resin on an aggregate of enameled wires.

In such collective insulated wire, when soldering the terminal, it is necessary to remove the assembly layer of the terminal and separate the enameled wire.

Removal of the aggregated layer of the aggregated insulated wire is performed by dissolving the resin forming the aggregated layer by immersing the terminal in an alcoholic solvent or mechanically removing the aggregated layer. In view of the damage of the layer, a method of dipping in alcohol-based solvents is the mainstream.

By the way, polyvinyl butyral, epoxy resin, polyester, polyhydric resins, such as polyurethane, polyamide (nylon), etc. are used as resin which forms the aggregation layer of an aggregated insulated wire.

However, in the aggregation layer made of polyvinyl butyral, the aggregation layer is easily dissolved by an alcohol solvent to easily separate the wires of the terminal, but the aggregation layer is used in the alcohol-freon mixed cleaning solvent used in the cleaning process after assembling electronic devices. There is a problem that the swelling and melting cause the function of the aggregation layer to be lost.

The aggregate layer formed using a crosslinking resin such as polyester does not swell and dissolve in the alcohol-freon mixed cleaning solvent, but does not dissolve in the alcohol-based solvent. Therefore, a mechanical removal method must be employed. There is a problem with sex. In addition, the aggregate layer formed using polyamides such as nylon 12 is not swelled and dissolved in the alcohol-freon mixed cleaning solvent, but does not dissolve in the alcohol-based solvent and can be dissolved by using phenols such as phenol and cresol. It may be difficult to handle due to toxicity.

Therefore, in the present invention, by coating and baking a paint containing polyvinyl butyral and stabilized polyisocyanate to form an aggregated layer, the present invention dissolves well in an alcohol-based solvent and facilitates separation of wires easily and quickly. An object of the present invention is to provide a collective insulated wire that allows the cleaning after the assembly to be performed as before, without swelling to the freon mixed cleaning solvent.

1 is a schematic cross-sectional view of a group of insulated wires according to the present invention; FIG. 2 is a schematic cross-sectional view of one embodiment of the collective insulated wire of FIG. 1. FIG.

In Fig. 1, reference numeral 1A denotes an aggregate wire provided by the present invention. This aggregate wire 1A is divided into three enameled wires 2... Are grouped together in parallel and parallel, and then set to aggregate 3, and the aggregate 3 is coated with the aggregate layer 4.

The enameled wire 2 has a polyvinyl formal, polyester, polyurethane, silicone, epoxy, nylon, phenoxy, polyimide, An insulating coating made of polyesteramide, polyester amideimide, polyhydantoin, polyhydantoin esterimide and the like is applied and baked to form an insulating layer 6 having a thickness of about 0.5 to 10 m.

Moreover, the said aggregation layer 4 is formed by apply | coating and baking a coating material containing polyvinyl butyral and stabilized polyisocyanate on aggregate 3.

Polyvinyl butyral is obtained by condensation of polyvinyl alcohol and butyl aldehyde as follows. In this invention, it is not limited to these ranges.

Commercially available polyvinyl butyral having a degree of polymerization of 300 to 3,000 and a degree of butalization of 70 to 90 mol% may be used, and it is preferable that a sufficient amount of hydroxyl groups react with the isocyanate groups of the stabilized polyisocyanate described later in the molecular chain.

Moreover, stabilized polyisocyanate temporarily inactivates isocyanate groups of polyisocyanates with a protective agent such as phenol and amide, and inactivates them. If necessary, the protective agent is dissociated by heat or a catalyst to regenerate the isocyanate group. Here, for example, the product name of `` Desmodur AP Stable '' manufactured by West German Bayer, which is a polyphenol-protected polyisocyanate, in which trimethylpropane is used as a polyhydric alcohol and triylene diisocyanate is added thereto, Stabilized polyisocyanate, such as the brand name "Coronate AP Stable" of Japan Polyurethane Industry Co., Ltd., can be used. In addition, stabilized polyisocyanate sold under the brand name "Coronate CT Stable" by the Japan Polyurethane Industry Co., Ltd. which protected the isocyanate shown by following formula with a phenol can also be used.

In addition, monodiisocyanate (MDI)

Although the following stabilized isocyanate sold by the Japanese Polyurethane Industry which protected by cresol by the brand name "Mionate MS 50" can also be used, It is not limited to these.

In the present invention, the mixing ratio of polyvinyl butyral and stabilized polyisocyanate is generally about 1 to about 1,000 parts by weight of stabilized polyisocyanate based on 100 parts by weight of polyvinyl butyral, but is based on 100 parts by weight of polyvinyl butyral. About 10 to about 300 parts by weight of stabilized polyisocyanate is suitable. When the stabilized polyisocyanate is less than 10 parts by weight, depending on the conditions, the crosslinking density of the obtained aggregate layer 4 may be insufficient, resulting in swelling in an alcohol-freon mixed cleaning solvent. When the content is more than 300 parts by weight, the crosslinking density is relatively high. It takes time for the aggregation layer 4 to dissolve.

Polyvinyl butyral and stabilized polyisocyanate are mixed in a predetermined mixing ratio, and then dissolved in a solvent such as ethanol, butanol, xylol, cyclohexanone or two or more of these mixed solvents to form a paint. As for the resin powder of this paint, about 5-40 weight% is suitable.

This paint is applied to aggregate 3 and baked to form aggregate layer 4. This coating baking may be performed using a normal enamel coating application baking apparatus, and baking may be performed at a temperature of about 200 to 300 ° C. at a baking time of about 2 seconds to 30 seconds, but may be performed outside of this baking condition.

In the present invention, the crosslinking density of the aggregation layer 4 is not limited to this range but is preferably about 30% to about 80% by gel fraction. If it is less than about 30%, the crosslinking density is insufficient, and it is easy to swell in an alcohol-freon mixed cleaning solvent, and when it exceeds 80%, the aggregate layer may be difficult to dissolve in the alcohol solvent.

In the aggregated insulated wire of the present invention, since the aggregate layer is obtained by application of a coating material containing a tetravalent polyvinyl butyral and a stabilized polyisocyanate, the hydroxyl group in the polyvinyl butyral and the isocyanate group of the stabilized polyisocyanate react to crosslink. By taking the structure, the crosslinking density is within an appropriate range, so that the assembly layer 4 can be dissolved in an alcohol solvent, and by immersing the terminal of the assembly insulated wire 1 in an alcohol solvent, the assembly layer 4 can be removed and separated into individual enameled wires 2. have. In addition, the assembly layer 4 does not swell by washing with an alcohol-freon mixed cleaning solvent after device assembly.

The coating thickness of the aggregation layer 4 of this embodiment varies slightly depending on the position as shown in Fig. 1, but the thinnest portion is suitably in the range of 0.1 to 10 mu m. If it is less than 0.1 micrometer, the intensity | strength of the aggregation layer 4 is low and a function as an aggregation layer 4 is not acquired, and when it exceeds 10 micrometers, the dissolution time of the aggregation layer 4 becomes long.

Fig. 2 shows another example of the collective insulated wire of the present invention, wherein the collective insulated wire 1 of this example has a plurality of enameled wires 2... The aggregate 3 is formed by concentrically joining together the composite lead, the composite lead, etc., and the aggregate layer 4 is formed on the aggregate 3 in the same manner as in the previous example.

EXAMPLE

In the following Examples and Comparative Examples, a copper wire having a conductor diameter of 0.05 mm and a polyurethane copper wire having an insulating layer thickness of 10 μm were used as enameled wires, and the wires were arranged in three parallel lines, and coatings of various compositions were applied. The baking furnace was baked at a temperature of 220 ° C. at a length of 10 m and a speed of 10 m / min, forming an aggregate layer having a thickness of 4 μm to form an aggregated insulated wire, and immersing the aggregated insulated wire in ethanol (alcohol solvent) at room temperature. The time required to separate the wires into three wires was obtained, and immersed in Freon TMS (alcohol-freon mixed cleaning solvent), and ultrasonically cleaned for 3 minutes, followed by observing the appearance of the aggregate layer. Solventability was examined. The results are shown in Tables 1A to 1D.

Experimental Example 1

As the brand name "Menka Butyral 6000C," 100 parts by weight of polyvinyl butyral sold by Electrochemical Industry Co., Ltd. (Japan) and the brand name "Coronate AP Stable", Japan Polyurethane Industry Co., Ltd. (Japan) 80 parts by weight of stabilized polyisocyanate, sold from, was applied and baked into an electrical assembly, a paint dissolved in 2,000 parts by weight of a mixed solvent containing ethanol and xylol in a volume ratio of 1: 1.

Experimental Example 2

As a brand name "Menka Butyral 6,000C", it is sold from Japan Polyurethane Industry Co., Ltd. as 100 weight part of polyvinyl butyral sold by Electrochemical Industry Co., Ltd., and a brand name "Millionate MS-50." 80 parts by weight of the stabilized polyisocyanate was applied and baked to the electrical assembly, a paint dissolved in 2,000 parts by weight of a mixed solvent in which ethanol and xylol were mixed at a volume ratio of 1: 1.

Experimental Example 3

100 parts by weight of polyvinyl butyral and 80 parts by weight of stabilized polyisocyanate (trifunctional MDI) sold by the Electrochemical Industry Co., Ltd. (Japan) as a trade name "Dencabutyral 6,000C" include ethanol and xylol. The coating material melt | dissolved in 2,000 weight part of mixed solvents mixed with 1 was apply | coated-baked to the electrical assembly.

Experimental Example 4

100 parts by weight of polyvinyl butyral (Dencabutyral 6,000C) and 80 parts by weight of stabilized polyisocyanate sold by Japan Polyurethane Industry Co., Ltd. (Japan) as ethanol and xylol The coating material melt | dissolved in 2,000 weight part of mixed solvents which mix | blended this at the volume ratio 1: 1 was apply | coated-baked to the electrical assembly.

Experimental Example 5

100 parts by weight of polyvinyl butyral and 60 parts by weight of stabilized polyisocyanate (coronate AP stable) sold by Electrochemical Industry Co., Ltd. (Japan) as a trade name "Dencabutyral 2,000L" The coating material melt | dissolved in 1,000 weight part of mixed solvents which mixed the silol in the capacity ratio 1: 1 was apply-baked to the electrical assembly.

Experimental Example 6

100 parts by weight of polyvinyl butyral (2,000 parts of dencabutyral) and 60 parts by weight of stabilized polyisocyanate (Millionate MS, 50), mixed solvent 1,000 parts by weight of n-butanol and xylol in a volume ratio of 1: 1. The paint melt | dissolved in the part was apply | coated-baked to the electrical assembly.

Experimental Example 7

100 parts by weight of polyvinyl butyral (2,000 parts of dencabutyral) and 60 parts by weight of stabilized polyisocyanate (trifunctional MDI) were dissolved in 1,000 parts by weight of a mixed solvent containing N-butanol and xylol in a volume ratio of 1: 1. Application baking was carried out to the aggregate.

Experimental Example 8

100 parts by weight of polyvinyl butyral (2,000 parts of dencabutyral) and 60 parts by weight of stabilized polyisocyanate (Coronate CT Stable) were dissolved in 1,000 parts by weight of a mixed solvent in which n-butanol and xylol were mixed at a capacity ratio of 1: 1. The coating material was applied and baked to the electrical assembly.

Experimental Example 9

100 parts by weight of polyvinyl butyral and 100 parts by weight of stabilized polyisocyanate (coronate AP stable), sold under the trade name "Dencabutyral 3,000k" from Electrochemical Industries, Ltd. (Japan), are cyclohexanone and xylol. The coating material melt | dissolved in 1,000 weight part of the mixed solvent which mixed this at the volume ratio 1: 1 was apply-baked to the electrical assembly.

Experimental Example 10

A coating material in which 100 parts by weight of polyvinyl butyral (denka butyral 3,000 K) and 100 parts by weight of stabilized polyisocyanate (millionate MS-50) are dissolved in 1,000 parts by weight of a mixed solvent in which cyclohexanone and xylol are mixed at a capacity ratio of 1: 1. Was applied and baked to the electrical assembly.

Experimental Example 11

An electrical assembly comprising a paint obtained by dissolving 100 parts by weight of polyvinyl butyral (denka butyral 3000K) and 100 parts by weight of stabilized polyisocyanate (trifunctional MDI) in 1,000 parts by weight of a mixed solvent in which cyclohexanone and xylol were mixed at a capacity ratio of 1: 1. The coating was baked on.

Experimental Example 12

100 parts by weight of polyvinyl butyral (dencabutyral 3000K) and 100 parts by weight of stabilized polyisocyanate (Coronate CT Stable) were coated with 1,000 parts by weight of a mixed solvent containing cyclohexanone and xylol in a volume ratio of 1: 1. Application baking was carried out to the aggregate.

[Comparative Example]

100 parts by weight of polyvinyl butyral (dencabutyral 6000C) was coated and baked into an electrical assembly, a paint dissolved in 2,000 parts by weight of a mixed solvent in which ethanol and xylol were mixed at a volume ratio of 1: 1.

TABLE 1a

It can be seen from Tables 1a to 1d that the individual wires are easily separated by ethanol of the collective insulated wire of the present invention and do not swell even with an ethanol-freon mixed solvent.

Claims (10)

The coating is composed of a plurality of enameled wire aggregates, and an aggregate layer formed by applying a coating material containing polyvinyl butyral and stabilized polyisocyanate to the aggregate and baking the polyvinyl butyral for crosslinking. An aggregated insulated wire, comprising about 1 to about 100 parts by weight of stabilized polyisocyanate per 100 parts by weight of vinyl butyral. 2. The collective insulated wire according to claim 1, wherein the paint contains about 10 to about 300 parts by weight of stabilized polyisocyanate per 100 parts by weight of polyvinyl butyral. 3. The collective insulated wire according to claim 2, wherein the crosslinking density of the aggregate layer is a gel fraction. The method of claim 3, wherein the paint contains a daily solvent selected from the group consisting of ethanol, butanol, xylol, cyclohexanone, and contains about 5 to about 40% by weight of polyvinyl butyral and stabilized polyisocyanate in total. Featuring insulated wires. 5. The collective insulated wire according to claim 4, wherein said polyvinyl butyral has a degree of polymerization of about 300 to about 3000 and a butyral degree of about 70 to about 90 mol%. 6. The collective insulated wire according to claim 5, wherein the aggregate layer has a thickness of about 0.1-10 m. (a) bundles with plural enameled wires to form an aggregate; (b) applying a coating material obtained by mixing about 1 to about 1000 parts by weight of stabilized polyisocyanate per 100 parts by weight of polyvinyl butyral to the joined body; (c) The manufacturing method of the collective insulated wire of Claim 1 which has the process of baking the said coating material apply | coated to the aggregate in order to bridge | crosslink. 8. A process according to claim 7, wherein the paint contains about 10 to about 300 parts by weight of stabilized polyisocyanate per 100 parts by weight of polyvinyl butyral. 9. A method according to claim 8, wherein said baking is carried out at about 200 to about 300 [deg.] C. for about 2 to 30 seconds. The method of claim 9, wherein the paint contains a daily solvent selected from the group consisting of ethanol, butanol, xylol, cyclohexanone, and contains about 5 to about 40% by weight of polyvinyl butyral and stabilized polyisocyanate in total. Manufacturing method characterized in that.

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