JPS6158927B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention is an insulated wire for use in electrical equipment, in particular an insulated wire provided with a special resin layer to improve processing resistance. Recently, it has become common for electrical equipment manufacturers to introduce high-speed automatic winding machines to speed up the winding process, but mechanical winding requires more severe processing than manual winding. Because of the additional steps, the electrical characteristics are significantly degraded. To improve this problem, silicone oil has been conventionally added to enamel varnish, or the frictional resistance of the insulating coating surface has been reduced using a so-called self-lubricating wire consisting of a double coating layer with a nylon resin coating layer on top. Some success has been achieved by methods such as reducing the amount of carbon dioxide and making use of the good mechanical properties of nylon resin.
However, in the former case, the appearance of the film deteriorates as the amount of silicone oil increases, making it insufficient as only a small amount can be added, and in the latter case, the heat resistance and reciprocating friction resistance of the resulting insulated wire are significantly reduced. It was something that caused the decline. On the other hand, it has been proposed to apply an aqueous dispersion of a natural wax emulsion and a water-soluble phenolic resin or a Sierra resin to the surface of an insulated wire. In this case, the reciprocating friction characteristics as well as the friction coefficient are significantly improved, and the rate of deterioration of characteristics due to processing is also significantly improved, and the coating thickness is extremely thin, about 1 to 2 μm, and the above-mentioned effects are achieved. Although it exhibited excellent effects such as not reducing the heat resistance of the electric wire, no improvement in mechanical properties could be expected. In this case, the mechanical properties can be improved by mixing the wax in the aqueous dispersion at a high mixing ratio of 60 to 80%.
On the other hand, the softening temperature of the baked film is relatively low, and when winding work is performed at high speeds, the softened coating adheres to the felt used to apply the tension, causing an abnormal phenomenon in the tension and making it difficult to withstand. This resulted in poor workability. In addition, this aqueous dispersion has a small amount of resin as a binder, so it can be baked at the normal baking temperature (approximately 400℃).
When coating and baking was carried out at a temperature of 100.degree. In view of the current situation, the present invention was developed as a result of intensive research to obtain insulated wires with excellent processing resistance. Polymer monomer 0-100
By applying and baking an aqueous dispersion consisting of 20 to 160 parts by weight of natural or synthetic wax per 100 parts by weight of the above-mentioned two parts, the wear coefficient is extremely low, the reciprocating wear characteristics are excellent, and high speed is achieved. It has been discovered that an insulated wire can be obtained whose electrical properties do not deteriorate in any way even when winding is performed using an automatic winding machine. The acrylic copolymer aqueous dispersion used in the present invention refers to one or more carboxylic acids having unsaturated bonds such as acrylic acid, methacrylic acid, itaconic acid, maleic acid, and fumaric acid. The main component is a copolymer of acrylonitrile and styrene. The thermosetting resin and reactive monomer may be those that can be dissolved or dispersed in water; for example, an epoxy monomer such as Tisonox 206 (trade name of Nitrogen Co., Ltd.), and a water-soluble phenol resin such as Plyophen J -303 (trade name manufactured by Dainippon Ink Chemical Co., Ltd.), Watersol J-675 (trade name manufactured by Dainippon Ink Chemical Co., Ltd.) as a water-soluble melamine resin, and Priamine TD-2712W (product name manufactured by Dainippon Ink Chemical Co., Ltd.) as a water-soluble urea resin. There is a first name). Also included are silane coupling agents such as γ-glycidoxypropyltrimethoxysilane, n-(trimethoxysilylpropyl)ethylenediamine, and water-soluble metal complex compounds. The acrylic copolymer is usually used as a water-based emulsion and as an underfloor polishing wax, and by coating and baking it on an insulating coating, its mechanical properties can be significantly improved. Furthermore, by adding a thermosetting resin or a reactive monomer to this resin, it is possible to improve the mechanical properties even more than when applying and baking an acrylic copolymer resin alone. be. However, with only a composition consisting of both of these, it is not possible to obtain a sufficient workability factor for insulated wires, that is, surface slipperiness. Therefore, in the insulated wire of the present invention, the surface slipperiness is improved by applying and baking an aqueous dispersion in which natural or synthetic wax is added to the above composition. As for natural waxes and synthetic waxes, soft waxes with a low melting point are undesirable because the softening temperature of the obtained film is lowered, resulting in poor mechanical properties. Therefore, it is desirable to use a hard wax with a high melting point, such as montan wax or carnauba wax for natural waxes, and stearylamide or bisstearamide for synthetic waxes. In addition, when preparing the aqueous dispersion used in the present invention, it is easier to prepare the emulsion by emulsifying and mixing the resin component and wax separately, rather than mixing the wax with the resin component and then emulsifying it. Therefore, it is desirable. In addition, the emulsifiers used at this time include aliphatic amine type emulsifiers, higher fatty acids and their esters, etc., but nonionic polyoxyethylene higher alcohol esters are preferable since they have relatively little effect on the coating film after baking. . The reason for limiting the blending ratio of the thermosetting resin or reactive monomer to 100 parts by weight or less to 100 parts by weight of the acrylic copolymer in the aqueous dispersion of the present invention is that the acrylic content of the thermosetting resin or reactive monomer is limited to 100 parts by weight. If the blending ratio to the copolymer exceeds 100 parts by weight, the mechanical properties of the resulting film will be adversely reduced. Also, the total amount of both of these
Natural or synthetic wax content per 100 parts by weight
The reason for limiting the amount to 20 to 160 parts by weight is that it is desirable to use as little wax as possible, but if it is less than 20 parts by weight based on 100 parts by weight of the resin content, the effect of improving the processing resistance of the resulting film will be weak. If the amount exceeds 160 parts by weight, the resulting film may become soft. The usually preferred range is 100 parts by weight or less. In addition, when using carnauba wax, the effect can be sufficiently exhibited at 40 to 80 parts by weight. The aqueous dispersion thus obtained is applied to the outside of an insulated wire, in which an electrically insulating film has been previously provided on the conductor, and it is passed through a drying oven with an oven temperature of 250 to 500°C to perform baking. The invention provides an insulated wire. At this time, the baking may be performed in the same furnace as the lower insulating coating layer, as long as the water vapor generated by baking does not have an adverse effect on the lower insulating coating layer. Further, in the insulated wire of the present invention, the upper insulating coating made of the aqueous dispersion has a thickness of 1 to 2 μm, has sufficient mechanical properties and slipperiness, and has excellent processing resistance. Next, examples of the present invention will be described. Comparative Example (1) Emulsion polymerization of 48 parts by weight of acrylic acid, 88 parts by weight of styrene, and 44 parts by weight of acrylonitrile together with 0.18 parts by weight of potassium persulfate and 9 parts by weight of polyoxyethylene nonylphenol ether in 720 parts by weight of water. Finally, an aqueous dispersion (A) was obtained. This aqueous dispersion (A) was applied onto an O type polyester insulated wire with a conductor diameter of 1 mm, and baked at 400°C to obtain an insulated wire with a coating layer of 1 to 2 μm thick. The results of measuring the wear resistance characteristics and wear coefficient of this insulated wire are shown in Table 1. Comparative Example (2) An aqueous dispersion (B) obtained by adding a commercially available Montan braze dispersion to an emulsion of Sierrak resin at a solid content ratio of 3:7 was mixed into an O with a conductor diameter of 1 mmφ in the same manner as above.
Coated on seed polyester insulated wire and heated to 400℃
An insulated wire with a coating layer of 1 to 2 .mu.m thick was obtained by baking. The results of measuring the wear resistance and wear coefficient of this insulated wire are shown in Table 1. Comparative Example (3) Aqueous dispersion ( C) was applied onto a polyester insulated wire with a conductor diameter of 1 mmφ and baked at 400°C.
An insulated wire with a coating layer of 2 μm was obtained. The wear resistance properties and wear coefficient of this insulated wire were measured. The results are shown in Table 1. Example (1) A commercially available carnauba wax dispersion was added in an amount of 40% by weight based on the solid content of the aqueous dispersion (C) used in Comparative Example (3) to obtain an aqueous dispersion (D). This dispersion was applied onto an O type polyester insulated wire having a conductor diameter of 1 mm in the same manner as described above, and baked at 400 DEG C. to form a coating layer with a thickness of 1 to 2 microns to obtain an insulated wire of the present invention. The results of measuring the wear resistance characteristics and wear coefficient of this insulated wire are shown in Table 1. In addition, the insulated wire obtained from Comparative Example (2) and the insulated wire of the present invention obtained from Example (1) were each heated at a wire speed using a high-speed winding machine.
After winding at 200 m/min for 20 minutes, in the case of the insulated wire of Comparative Example (2), a resinous material with a maroon color was attached to the felt used for tension adjustment, and the tension changed from the original 2 kg/mm ² . It had become about three times as large. In contrast, no abnormality was observed in the insulated wire of the present invention. Example (2) A water-soluble titanium compound MC-5000 (manufactured by Matsumoto Kosho) was added to the aqueous dispersion (A) used in Comparative Example (1) in an amount of 5% by weight based on the resin content in the dispersion, Furthermore, an aqueous dispersion (E) obtained by adding approximately 35% by weight of a commercially available dispersion of bisstearamide was applied onto an O type polyester insulated wire with a conductor diameter of 1 mmφ in the same manner as above.
An insulated wire of the present invention having a coating layer of 1 to 2 .mu.m was obtained by baking at .degree. The results of measuring the wear resistance characteristics and wear coefficient of this insulated wire are shown in Table 1. Further, when the wire was wound using a high-speed winding machine in the same manner as in Example (1), no abnormalities were observed. Example (3) For the aqueous dispersion (A) used in Comparative Example (1), Tisonox 206 was added to the aqueous dispersion (A) in an amount of about 20
Aqueous dispersion (E) containing approximately 40% by weight of commercially available montan wax was added to a conductor with a diameter of 1 mm in the same manner as above.
Coated on φ O type polyester insulated wire,
The insulated wire of the present invention was baked at 350° C. to form a coating layer of 1 to 2 μm. The results of measuring the wear resistance characteristics and wear coefficient of this insulated wire are shown in Table 1.

【table】

[Table] As detailed above, the insulated wire of the present invention does not deteriorate its original electrical properties and has extremely excellent abrasion resistance and wear coefficient. It has remarkable effects such as not recognizing

Claims (1)

[Claims] 1. 0 to 100 parts by weight of a thermosetting resin or reactive monomer per 100 parts by weight of the acrylic copolymer and natural or synthetic wax per 100 parts by weight of the above two on the insulating baked film layer on the conductor. A process-resistant insulated wire characterized by being coated and baked with an aqueous dispersion having a blending ratio of 20 to 160 parts by weight.