JPS5851410A - Self-adhesive insulated wire - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a self-bonding insulated wire with excellent heat resistance.

Conventionally, coil forming for electrical equipment and communication equipment has been carried out using an insulating layer on the conductor for labor saving and simplification, as well as for the varnish impregnation process for equipment glue. So-called self-bonding insulated wires are used, which are coated with a heat-fusible coating.

Polybutyral resin, polyamide resin, phenoxy resin, etc. are often used as the thermal melting three layers of this self-bonding insulated wire, but such thermoplastic resins soften at temperatures below 150°C. Therefore, in actual IJA cases where an overload current flows through the -1 coil, or when placed in a high-temperature atmosphere, there is a problem in that the fusion strength is significantly reduced.

The use of high melting point thermoplastic resins such as polysulfone resins in place of such low melting point thermoplastic resins has been considered, but a decrease in fusion strength was unavoidable.

In addition, thermosetting resins with excellent heat resistance such as aliphatic polyimide resins are also used as the heat-melting @ layer, but such resins are made of a base insulating layer (e.g. polyester, polyesterimide, polyamideimide, polyimide). With the same baking strip, hardening progresses after baking for 1'J, and there is a problem in that it is difficult to fuse even when heated. For this reason, Shimojizetsu R1N
After baking, it is necessary to bake the wire in a separate furnace with different temperature distribution and at different wire speeds, which makes it more economical (and more economical) than other self-bonding insulated wires using thermoplastic resin. The problem was that it was not expensive.

The inventors of the present invention investigated these difficulties and found that when the imide-modified linear polyester resin described below is used as a fusion layer, it is sufficient to use the same baking line and baking number as the base insulating layer. We have discovered that there is a self-bonding insulated wire that has excellent fusing strength and does not deteriorate its fusing strength even in a humid temperature atmosphere.

The present invention was made in connection with such knowledge, and (
A) Per 1 liter of aromatic dicarboxylic acid or its derivative,
(B) 0.2-2.5 mol of trimellitic anhydride;
(C) -1.25 mol to 0.1 aromatic diamine, (
D) Heat reaction in a polyester resin of 3.5 moles or more (paint obtained by dissolving the obtained imide-modified linear polyester resin in a solvent is applied directly to the conductor-F or on other insulating material layers) It is an object of the present invention to provide a self-bonding insulated wire characterized in that it is formed by applying and baking the wire.

Or its derivatives include terephthalic acid, isophthalic acid, 4,4'-benzophenonedicarboxylic acid, 4,4
'-Diphenylcarboxylic acid, 4,4'-diphenyl ether dicarboxylic acid, diphenylmethane dicarboxylic acid, and lower alkyl esters thereof, among which dimethyl terephthalate is particularly suitable.

Further, as the aromatic diamine (C), 4,4'-diaminodiphenylmethane, 4,4'-diaminodiphenyl ether, 4,4'-diaminodiphenylpropane,
Examples include 4,4'-diaminodiamine, phenylsulfone, 1,5-diaminonaphthalene, m-phenylenediamine, P-phenylenediamine, and 3,3'-dimethoxybenzine.

Further km. Examples of the polyhydric alcohol (D) include ethylene glycol, diethylene glycol, neopentyl glycol, propylene glycol, trimethylene glycol, 1,4-butanediol, glycerin, and trimethylolpropane, but ethylene glycol is particularly suitable. There is.

These starting materials <A) to (D) are used within the following molar ratio range, respectively.

(A) 1 mole (B) 0.2 to 2.5 moles (C) 0.1 to 1.25 moles (D) 3.5 moles or more If the molar ratio is outside the above range, the adhesive strength of the paint will decrease. Or,
This is not preferable because the retention rate in a high temperature section may decrease.

The imide-modified linear polyester resin in the present invention is produced by the following method.

That is, first, component (A) is dissolved in component (D>) and the temperature is gradually raised to about 180°C, and at this temperature 0.5
Continue heating for about 2 minutes to carry out the transesterification reaction. At this time, it is desirable to add Petit 21m lead, Acetate II lead, etc. as a reaction catalyst.

Next, predetermined amounts of component (B) and component (C) are added to this solution simultaneously, or perhaps sequentially, and heated at a temperature of 180 to 220°C for 5 to 12 hours to remove reaction water and excess ethylene glycol. While reacting.

After the reaction is completed, a solvent such as cresol is added to the post-reaction system to obtain a paint having a desired viscosity. The solution of the imide-modified linear polyester resin thus obtained is directly coated and baked onto a conductor as a paint, preferably via another insulating coating, to obtain the self-monosaccharide insulated wire of the present invention.

The base insulation coating is preferably one with good heat resistance such as polyester, polyesterimide, polyamideimide, polyesteramideimide, etc. In particular, in this case, the top layer should be baked at the same furnace distribution and the same linear speed. Since it is possible to do this, it is only necessary to divide the coating device, which is economically advantageous.

The self-fusing insulated wire of the present invention has a temperature of 180~
By being heated to a concentration of 260°C, self 11@kaku softens and becomes I! Ilil adheres and integrates.

The crosslinking reaction further progresses due to heat during subsequent use, improving electrical and mechanical properties.

Next, let's talk about examples. explain.

Example 1 Dimethyl terephthalate 194q (1 mol) was dissolved in ethylene glycol 248Q (4 mol), 2 g of lead naphthenate was added as a reaction catalyst, and the mixture was reacted by heating at 160° C. for 4 hours. When methanol is no longer generated, trimellitic anhydride 192a (1 mol) and 4.4
'-Diaminodiphenylmethane 990 (0.5 mol) was added and the temperature was raised to 200°C and heated for 6 hours. Reaction water and excess ethylene glycol generated during the reaction were removed.

The reaction was stopped by adding cresol to obtain a paint having a solid content of 38% and a solution viscosity of 56 voids (30°C). This has a diameter of 0.
Coating and baking on a 32am esterimide wire (using 150MID made by Sukeneta 9fi Co., Ltd.) to obtain a JISM rating of 0.
I finished it as a seed. For baking, a horizontal furnace with a furnace length of 21 is used.
The test was carried out under the conditions of a furnace temperature of 450° C. and a linear speed of 261/min. The properties of the obtained self-bonding insulated wire were as shown in the table below.

The adhesive strength and retention rate at 150°C are the values obtained by testing after heating at 240°C for 30 minutes to fuse the wires. Example 2 Trimellitic anhydride and 4.4' in Example 1 - Solid content was 37%, solution viscosity was 41 voids (30
℃) paint was obtained. This was coated and baked in the same manner as in Example 1, and Characteristic 5 was tested for the resulting electric wire. The results were as shown in the table.

Example 3 A paint was prepared in the same manner as in Example 1 using 1 mol of dimethyl isophthalate, 4 mol of ethylene glycol, 0.5 mol of trimellitic anhydride, and 0.5 mol of 4,4'-diaminodiphenyl ether. Manufactured. The resulting paint had a solid content of 40% and a solution viscosity of 68 voids (30°C). This was coated and baked on the same type of polyesterimide heddle used in Example 1, and the properties were tested in the same manner. In addition, Comparative Example 1 in the table uses TVE5024 (manufactured by Toshiba Chemical Co., Ltd., a trade name of polyvinyl butyral-based self-fusing varnish for electric wires) as a fusing layer, and Comparative Example 2 uses IS OP.

0XY506-C (trade name of phenoxy-based self-fusing electric wire varnish manufactured by Sukeneta 9 Hui Co., Ltd.), Comparative Example 3 was polysulfone resin, and Comparative Example 4 was TCV-G (polyimide self-fusing varnish manufactured by Tokyo Tokushu Toyo Co., Ltd.). (trade name of electric wire varnish), and is shown here for comparison. Furthermore, the fusion in Comparative Examples 1 and 2 was carried out at 150° C. for 30 minutes.

(Hereinafter, blank space) As is clear from the above examples, the retention rate at 150° C. is improved and the heat softening resistance is excellent.

Furthermore, it is possible to bake under the same conditions as the undercoat, making it economical and possible to reduce the cost of the product.

Representative Patent Attorney Suyama Sa

Claims (1)

[Claims] 1, (Δ) per mole of aromatic dicarboxylic acid or its derivative, (13) t-limeriz 1 to acid anhydride 062-2
．． 5 mol, and (0) monoaromatic diamine 0. 1-1.25
Mol and (D)3. ! A coating made by dissolving an imide-modified linear polyester resin in a solvent, which is obtained by heat reaction in a polyhydric alcohol of 5 moles or more, is applied and baked onto the conductor directly or through another insulating layer. Features self-bonding insulated wire.