JPS6359483B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a self-adhesive insulated wire that is used for a wide range of purposes as a wire for equipment coils such as electrical and communication equipment. Self-adhesive insulated wires are effective in saving labor and simplifying the manufacturing process of electrical and communication equipment, and in terms of health and safety and environmental pollution control in the varnish impregnation process of equipment, and are expected to be put into practical use and expanded in use. There are some notable ones. However, self-adhesive insulated wire has the disadvantage of inferior wear resistance compared to general insulated wire, and as the winding speed has increased in recent years, processing deterioration during winding has occurred. has become a problem, and a drastic improvement in the abrasion resistance of self-adhesive insulated wires is desired. This type of self-adhesive insulated wire has traditionally been produced using linear polymeric compounds such as polyvinyl petitral resin, polyvinyl formal resin, polyamide resin, and phenoxy resin, either alone or in combination of two or more, in an appropriate solvent. Adhesive paint made by melting (however, in the case of polyvinyl formal resin,
Due to its poor adhesive properties, it cannot be used alone. )
Either directly onto the conductor or through another insulating film, it is coated and baked, or for the purpose of improving heat resistance, epoxy is added to the linear polymer compound or a suitable combination of two or more of the above linear polymer compounds. resin,
A paint made by appropriately combining and blending some of stabilized isocyanate resins, phenol formaldehyde condensates, melamine formaldehyde condensates, etc., is applied to the conductor directly or through another insulating film as described above and baked. This is what was done. However, self-adhesive insulated wires made by coating and baking a paint made only of the linear polymer compound directly onto the conductor or via another insulator have a higher wear resistance than ordinary enamelled wires. The degree of deterioration in performance is relatively small, and it is used in practical use. However, as the speed of winding in the winding process has increased in recent years, there has been an increase in the number of scratches caused by the nozzles, pulleys, etc. of the winding machine, and countermeasures against layer shorts, etc. caused by this have become a problem. ing. In addition, in order to improve the heat resistance of this self-adhesive insulated wire, epoxy resin, stabilized isocyanate resin, phenol formaldehyde condensate may be added to the above-mentioned linear polymer compounds alone or in an appropriate combination of two or more. , melamine-formaldehyde condensates, etc., or a mixture of some of them, applied directly or via another insulating film and baked. In order to maintain the conductor in a B-stage (semi-cured) state, its wear resistance is determined by applying and baking a paint consisting only of the linear polymer compound directly to the conductor or through another insulating film. It is even lower than that of electric wires,
Similar to the above, countermeasures against layer shorts and the like have become a problem. Most of the causes of processing deterioration during winding of self-adhesive insulated wires are layer shorts caused by scratches caused by rubbing against nozzles, pulleys, etc., and as a way to prevent this, self-adhesive insulated wires are used. It is possible to improve the wear resistance of the material and reduce the friction coefficient. For these reasons, conventional methods have been taken such as applying lubricating oil to the self-adhesive insulated wire to an extent that does not adversely affect the adhesion. However, these methods cannot withstand the harsh winding conditions of recent years and are subject to processing deterioration. In view of these circumstances, the inventors have already proposed that ultrafine tetrafluoroethylene resin powder and ultrafine polypropylene resin powder be individually dispersed in the adhesive film of the self-adhesive insulated wire, thereby improving wear resistance. We succeeded in improving the properties and reducing the coefficient of friction. However, the above-mentioned proposal is not completely free from problems caused by the mixing of solid powder with poor compatibility in the adhesive resin, and is still far from perfect. That is, in the case of ultrafine tetrafluoroethylene resin powder, the degree of improvement in abrasion resistance is large and it has the advantage of not impairing heat resistance at all. Moreover, since it is a powder with a high specific gravity in the form of an adhesive paint, it tends to settle on the bottom of the varnish, making it difficult to work with the paint. In particular, the problems of the powder content and appearance are related to wear resistance, which is an important characteristic of the electric wire, and appearance, which is important in terms of commercial value, and it was necessary to perfect the product. According to the inventors' previous studies regarding this problem, the average particle size of the powder is 10 μm.
If the content exceeds 100%, the appearance is poor and the abrasion resistance is hardly improved at any content. The appearance was good only when the average particle size was 10μ or less, but the larger the particle size within this range, the worse the appearance will be if the content is not kept low, so the wear resistance will improve. There was a limit to how much it could be done. By the way, if the average particle diameter is more than 5μ and less than 10μ, the content should be 2% by weight or less (preferably 1% by weight).
(below), and no significant improvement in abrasion resistance can be expected.In order to improve the abrasion resistance and improve the appearance using this invention, the average particle size must be
It was preferred to use a powder of less than 5μ. In this case, the content could be increased to 6% by weight. On the other hand, in the case of ultra-fine polypropylene resin powder, if one with an average particle diameter of 10μ or less, preferably 5μ or less, is used, it has a good appearance, is uniformly dispersed in the paint even in the form of an adhesive paint, and can be used on the bottom surface. There was no sedimentation, and workability was good. However, this powder is currently inferior to ultrafine tetrafluoroethylene resin powder in terms of the degree of improvement in wear resistance and heat resistance. In view of these points, the inventors made earnest efforts and as a result, came up with an invention that has good workability, good appearance, and can greatly improve wear resistance. That is, in the present invention, the mixing ratio of ultrafine polypropylene resin powder with an average particle size of 10μ or less and ultrafine tetrafluoroethylene resin powder with an average particle size of 10μ or less is 1:10 to 10: 1, the mixed resin powder is 6% by weight or less based on the resin content,
By applying and baking an adhesive paint containing 0.1% or more by weight directly or through another insulating film, it has self-adhesive properties that have adhesive performance, excellent abrasion resistance, and good appearance and workability. They succeeded in obtaining an insulated wire and completed the present invention. To explain this in more detail below, if the average particle size of both the ultrafine polypropylene resin powder and the ultrafine tetrafluoroethylene resin powder used in the present invention exceeds 10μ, the appearance of the electric wire will deteriorate and the insulation will deteriorate. It cannot be used as an electric wire. Furthermore, if the amount of the mixture of the two types of resin powder added exceeds 6% by weight based on the resin component of the film, the appearance becomes poor and the wire cannot be used as a self-adhesive insulated wire. Further, if the amount of the mixed powder added is less than 0.1% by weight, no improvement in wear resistance is observed. Preferably, each of the two types of resin powders has an average particle size of
The amount added is 1.0% by weight or more based on the resin component of the film as a mixture of the two types of resin powders,
In this case, the appearance of the self-adhesive insulated wire is good, there is no decrease in adhesive strength retention characteristics at high temperatures, and the wear resistance is improved without compromising heat resistance at all. In addition to this, workability is also improved. Furthermore, when adding the resin powder to an adhesive paint, it is very difficult to disperse if added directly, but a high amount (50% by weight) of the adhesive paint is well dispersed using a ball mill, etc. If the powder is mixed with a paint or dispersed in a solvent such as xylene, naphtha, cyclohexanone, etc. and mixed with an adhesive paint, it will be sufficiently dispersed and good results will be obtained. In addition, as adhesive paints to which the resin powder can be added, linear polymeric compounds such as phenoxy resin, polyvinyl acetal resin such as polyvinyl butyral resin and polyvinyl formal resin, and polyamide resin may be used singly or in combination of two or more. (However, in the case of polyvinyl formal resin, it cannot be used alone due to its poor adhesive properties.) Or it can be used as a thermally stable adhesive film that causes chemical bonds with each other when heated during adhesion. In order to achieve , condensates of phenols such as phenol, cresol, xylenol, and formaldehyde, acetaldehyde, furfural, etc., phenolic resins such as p-vinylphenol, etc. alone or in combination.
There are compounds obtained by appropriately combining more than one type of linear polymer compound, blending the linear polymer compound alone or a combination of two or more types (film-constituting resin component), and dissolving it in a soluble solvent. The present invention will be explained below with reference to examples.
The invention is not limited to this example. Example 1 Film thickness obtained by baking enamel on 1.0 mm copper wire
On top of a 0.030 mm polyesterimide wire, 22 parts by weight of phenoxy resin, 16 parts by weight of a 50% solution of alcohol-modified melamine formaldehyde condensate were dissolved in 62 parts by weight of cyclohexanone, and ultrafine polypropylene resin powder and ultrafine four An adhesive paint made by dispersing mixed resin powder with a mixing ratio of fluorinated ethylene resin powder of 1:10 in a weight ratio of 3.0% based on the resin content of the solution is applied and baked to a film thickness of 0.015 mm. Ta. Example 2 On the same polyester imide wire as in Example 1,
An adhesive paint that was the same as in Example 1 except that the mixing ratio of ultrafine polypropylene resin powder and ultrafine tetrafluoroethylene resin powder was 4:6 by weight was applied and baked to a film thickness of 0.015 mm. . Example 3 On the same polyester imide wire as in Example 1,
An adhesive paint that was the same as in Example 1 except that the mixing ratio of ultrafine polypropylene resin powder and ultrafine tetrafluoroethylene resin powder was 6:4 by weight was applied and baked to a film thickness of 0.015 mm. . Example 4 Adhesion was carried out in the same manner as in Example 1, except that the mixing ratio of ultrafine polypropylene resin powder and ultrafine tetrafluoroethylene resin powder was 10:1 by weight on the same polyesterimide wire as in Example 1. The coating thickness of the paint is
It was coated and baked to a thickness of 0.015mm. Example 5 On the same polyester imide wire as in Example 1,
The same adhesive paint as in Example 1 was applied and baked to a film thickness of 0.015 mm, except that the content of the mixed fine resin powder was 1.0% by weight based on the resin content. Example 6 On the same polyester imide wire as in Example 1,
The same adhesive paint as in Example 1 was applied and baked to a film thickness of 0.015 mm, except that the content of the mixed fine resin powder was 6.0% by weight based on the resin content. Example 7 On the same polyesterimide wire as in Example 1, 30 parts by weight of phenoxy resin was dissolved in 60 parts by weight of cyclohexanone, and the mixing ratio of ultrafine polypropylene resin powder and ultrafine tetrafluoroethylene resin powder was adjusted by weight. An adhesive paint consisting of a 6:4 mixed fine resin powder dispersed in an amount of 3.0% by weight based on the resin content of the solution was applied and baked to a film thickness of 0.015 mm. Example 8 On the same polyester imide wire as in Example 1,
71.4 parts by weight of polyvinyl formal resin, 28.6 parts by weight of phenoxy resin, 21.4 parts by weight of a 50% solution of alcohol-modified melamine formaldehyde condensate, and 71.4 parts by weight of phenol formaldehyde condensate were dissolved in 556.0 parts by weight of cyclohexanone and 71.7 parts by weight of furfural. A film is coated with an adhesive paint made by dispersing 3.0% by weight of mixed fine-grained resin powder in which the mixing ratio of ultra-fine polypropylene resin powder and ultra-fine tetrafluoroethylene resin powder is 6:4 based on the resin content of the solution. It was coated and baked to a thickness of 0.015mm. Comparative Example 1 The same adhesive paint as in Example 1 was applied on the same polyesterimide wire as in Example 1, except that the mixture of ultrafine polypropylene resin powder and ultrafine tetrafluoroethylene resin powder was not included, and the film thickness was 0.015 mm. I coated it and baked it. Comparative Example 2 On the same polyesterimide wire as in Example 1,
The same adhesive paint as in Example 7 was applied and baked to a film thickness of 0.015 mm, except that it did not contain a mixture of ultrafine polypropylene resin powder and ultrafine tetrafluoroethylene resin powder. Comparative Example 3 On the same polyester imide wire as in Example 1,
The same adhesive paint as in Example 8 was applied and baked to a film thickness of 0.015 mm, except that the mixture of ultrafine polypropylene resin powder and ultrafine tetrafluoroethylene resin powder was not included. Comparative Example 4 On the same polyesterimide wire as in Example 1,
Example 1 except that instead of the mixture of ultrafine polypropylene resin powder and ultrafine tetrafluoride resin powder, only ultrafine polypropylene resin powder was mixed alone.
The same adhesive paint was applied and baked to a film thickness of 0.015 mm. Comparative Example 5 On the same polyester imide wire as in Example 1,
An adhesive paint having a film thickness of 0.015 was used, which was the same as in Example 1 except that instead of the mixture of ultrafine polypropylene resin powder and ultrafine tetrafluoroethylene resin powder, only ultrafine tetrafluoroethylene resin powder was mixed alone.
It was coated and baked to a thickness of mm. Comparative Example 6 A commercially available polyesterimide paint was applied to a 1.0 mm copper wire to a film thickness of 0.045 mm and baked. The polyesterimide paint used in the Examples and Comparative Examples is Isomydo-RH (Schenectady).
Co. brand name), and the ultrafine polypropylene resin powder is LANCO WAX PP-1362D (Georg N.
Langer Co. (trade name), ultrafine tetrafluoroethylene resin powder is Leburon L-2 (Daikin Industries, trade name)
It is. Next, Examples 1, 2, 3, 4, 5, 6, 7, 8
The characteristics of the self-adhesive insulated wires obtained in Comparative Examples 1, 2, 3, 4, 5, and 6 are shown in the table.

【table】

【table】

[Table] As shown in the table, the self-adhesive insulated wire of the present invention has a good appearance, has a small decrease in adhesive strength retention characteristics at high temperatures, and is resistant to wear without any loss in heat resistance. It can be seen that not only the properties are improved, but also the workability is good.

Claims (1)

[Claims] 1 Ultrafine polypropylene resin powder with an average particle size of 10μ or less and ultrafine tetrafluoroethylene resin powder with an average particle size of 10μ or less in a weight ratio of 1:10.
An adhesive paint made by adding a ~10:1 mixed resin powder of 6% by weight or less and 0.1% by weight or more based on the resin component of the film is applied and baked onto the conductor directly or via another insulating film. A self-adhesive insulated wire featuring: