JPS61168668A - Self-welding insulating paint - Google Patents

Abstract

PURPOSE:To improve the bond strength and heat resistance of a self-welding insulating paint for insulated wire at an elevated temp., by dissolving a blend of a polyhydroxypolyether resin, a polyethersulfone resin and a titanium chelate compd. in an org. solvent. CONSTITUTION:A 100pts.wt. polyhydroxypolyether resin (a) having an MW of 10,000 or above, 10-200pts.wt. polyethersulfone resin (b) and 0.3-6.0pts.wt. (in terms of titanium) titanium chelate compd. (c) are blended together. The blend is dissolved in an org. solvent. The titanium chelate compd. (c) can be reacted with the polyhydroxypolyether resin (a) to effect B-stage curing. As component (c), a product obtd. by reacting a lower alkyl titanate with ethylene glycol, triethanolamine or diethylene glycol is used.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is designed to form the outermost adhesive layer of self-bonding insulated wires, etc., which can be easily formed into coils, and has excellent heat resistance and adhesion strength at high temperatures. This invention relates to self-bonding insulating paint.

(Prior art) Self-fusing insulated wires do not require the use of impregnated varnish after coil forming as in the past, but the wires can be fused and integrated by twisting and heating the coil formed body. As a result, the coil processing process is extremely simplified, and it has great advantages such as being able to save a lot of labor.

Conventionally, the adhesive resin layer provided as the outermost layer of a self-bonding insulated wire is made of polyvinyl pukiral resin, alcohol-soluble nylon, phenoxy resin, or the like. However, since these resins have a low thermal softening temperature, the formed adhesive layer cannot maintain sufficient adhesive strength at high temperatures, and the operating temperature range is 10
The temperature was around 0°C.

Therefore, conventional self-bonding insulated wires have been limited to stationary equipment used at relatively low temperatures, such as transformers or television yoke coils, and their range of use has been greatly restricted. It is something that

(Object of the Invention) An object of the present invention is to provide a heat-resistant, self-fusing insulating coating that exhibits sufficient adhesive strength even at high temperatures.

(Structure of the Invention) The self-adhesive insulating paint of the present invention contains 10 to 200 parts by weight of a polyether sulfone resin and a titanium chelate compound to 100 parts by weight of a polyhydroxy polyether resin having a molecular weight of about 10,000 or more. as 0.3
It is characterized in that it contains up to 60 parts by weight and is dissolved in an organic solvent.

To explain the self-adhesive insulating paint of the present invention in more detail, firstly, the first component, a polyhydroxy polyether resin having a molecular weight of about 10,000 or more, is represented by the following general formula.

Re OHRt Specific examples of commercially available resins include PKHH
(trade name of Union Carbide Co., USA), yp-50 (trade name of Tobu Kasei Co., Ltd.), etc.

In addition, the molecular weight of the polyhydroxy polyether resin is about 10,
The reason for limiting it to OO0 or more is that the molecular weight is approximately 10.000.
This is because, if less than 20% of the total amount is used, the resulting film will have poor flexibility.

Next, the polyether sulfone resin as the second component in the present invention is represented by the following general formula.

(However, n is a positive integer.) Specific examples of commercially available resins include P-20
0 and Pico (all product names of British ICI Ltd.).

In addition, in the present invention, the reason why the amount of polyether sulfone resin blended with respect to 100 parts by weight of polyhydroxy polyether resin is limited to 10 to 200 parts by weight is that 10
If the amount is less than 200 parts by weight, the film of the adhesive layer will not exhibit sufficient adhesive strength at high temperatures, and if it exceeds 200 parts by weight, the temperature required for adhesion will be too high, making it unsuitable for practical use. .

Furthermore, the titanium chelate compound as the fifth component used in the present invention can easily achieve B-stage curing with polyhydroxypolyether resin. A titanium chelate compound reacted with , octylene glycol, ace)D acid ester, etc. is used.

In addition, as a titanium chelate compound of octylene glycol, there is ORGATIX TO-200 (70 tibutanol solution, titanium content 5.2±0.5% by weight) (trade name of Matsumoto Pharmaceutical Industries, Ltd.).

Further, as a titanium chelate compound of triethanolamine, there is Orgatix and TO-100 (80% isopropyl alcohol solution, titanium content 8.3±0.5%, trade name manufactured by Matsumoto Pharmaceutical Industries, Ltd.).

Further, in the present invention, the amount of the titanium chelate compound is limited to 0 to 6.0 parts by weight based on 100 parts by weight of the polyhydroxypolyether resin as the weight of titanium in the compound. If the amount exceeds 6 parts by weight, crosslinking will proceed too much, leading to a decrease in the adhesive strength between the lines.

(Example, comparative example) Next, the present invention will be explained by giving Examples and Comparative Examples.

Examples (1) to (6), Comparative Examples (1) to (5) Diameter 0.
Coat a 5+W copper wire with polyester imide varnish (trade name: Isomid, manufactured by Schenectady) and bake it to a thickness of 2.
An insulated wire with a 5μ film was obtained.

Next, the self-fusing insulating paints of the present invention (Examples (1) to (6)) and the self-fusing insulating paints of the comparative examples (Comparative Examples (1) to (5)) having the compositions shown in Table 1 were applied as described above. A self-bonding insulated wire was obtained by applying and baking a 12 μm thick adhesive resin layer on the outside of the insulated wire using a baking furnace with a furnace length of 5 m and a temperature of 300° C. at a rate of 15 m/min.

In addition, for comparison with conventional products, polyvinyl butyral resin (
A sample using Sekisui Chemical Co., Ltd. (trade name: BX-1) as the adhesive layer was prepared in the same manner.

In order to measure the adhesive strength of these self-bonding insulated wires, they were tightly wound around a round bar with a diameter of 5τ to form a 70-meter long spiral coil, and heated and fused at 220°C for 30 minutes to obtain an ASTM standard.
-2519, room temperature, 150℃ and 18℃
The adhesive strength at 0°C was measured and the results are shown in Table 2.

In addition, in order to compare with the self-bonding insulated wire to which the self-bonding insulating paint of the present invention has been applied, an insulated wire obtained by coating and baking polyester imide varnish on a copper wire with a diameter of 0.5 mm in the same manner as above was used. A helical coil was made in the same way and coated with epoxyphenol-impregnated varnish (US P, D, Geor
The adhesive strength was similarly measured for a coil (Comparative Example-6) that was immersed in Pedigree m 923 (trade name, manufactured by Ge Corporation), air-dried, and then heated at 160°C for 5 hours.
The results are also listed in Table 2.

Table 2 (Effects of the Invention) As is clear from Table 2 above, the self-bonding insulated wire using the self-bonding insulating paint of the present invention is superior to conventional insulated wires of this type and general-purpose impregnated varnish. It has clearly superior heat resistance properties compared to coils, and has high industrial utility value.

Claims (1)

[Claims] 10 to 200 parts by weight of a polyether sulfone resin and 0.3 to 6.0 parts by weight of a titanium chelate compound are blended with 100 parts by weight of a polyhydroxy polyether resin having a molecular weight of about 10,000 or more, and this is mixed with an organic solvent. A self-adhesive insulating paint characterized by being dissolved in.