JPH0423362B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to improvements in glass windings. Traditionally, a single layer of glass thread (JIS symbol
SGC) or double (JIS symbol DGC) horizontally wound glass windings are already known as heat-resistant magnet wires. This glass winding wire is coated with an insulating varnish and baked for the purpose of reinforcing the insulation between the glass threads and preventing fraying and fuzzing of the threads. Since the glass thread itself is an inorganic substance, it has excellent heat resistance, but the heat resistance of the insulating varnish is poor, so the heat resistance of the glass winding depends on the insulating varnish used. For example, if alkyd resin, phenol-modified alkyd resin, phenolic resin, etc. are used for insulation varnish, type B (130℃) (B-
SGC, B-DGC), alkyd resin containing THEIC,
Type F (155℃) (F-SGC, F-DGC) when using silicone modified polyester resin, H type when using aliphatic polyimide resin or silicone resin
Seed (180℃) (H-SGC, H-DGC). In this way, the heat resistance of insulating varnish is class H at most, so even though glass thread, a material with excellent heat resistance, is used and the space factor is sacrificed, sufficient characteristics cannot be achieved. is the current situation. Therefore, the present inventors previously filed an application for a glass winding wire (Japanese Patent Application No. 111327-1981) in which glass thread was horizontally wound and a polyborosiloxane resin coating was applied thereon.
It had the disadvantage of poor mechanical strength and hydrolysis resistance. The present invention was made in view of the above circumstances, and provides a glass made of an insulating varnish made of polyborosiloxane resin and silicone resin, which are semi-inorganic polymers, and an inorganic filler dissolved or dispersed in an organic solvent. Regarding winding. The glass thread used in the present invention is usually JISR-3413
ECD450-1/0 specified in The polyborosiloxane resin used in the present invention is (a) a silane compound represented by SiX ₄ , SiRX ₃ , or SiRR′X ₂ (wherein R and R′ are an alkyl group or an aryl group, and X is a hydroxyl group) , an alkoxyl group, an acetoxyl group, a halogen group, and X
If is a hydroxyl group, it also includes its dehydrated condensate)
species or two or more species and (b) one or two or more species of boric acid, boric anhydride, boric acid metal salts, boron halides, and boric acid esters in an atomic ratio of Si:B of 1:10 to 10. :1 preferably in the range of 5:1 to 1:5; (c) silicone oil represented by the following general formula; (However, R is a methyl group or a phenyl group, n=0
~2300) and can be obtained by heating at 50 to 800°C for condensation polymerization. At this time, organic solvents such as acetylacetone, acetic anhydride, cresol, tetrahydrofuran, xylene, N-methyl-2-pyrrolidone, and dimethylacetamide may be used as necessary. By blending and reacting component (c) with components (a) and (b) above, the flexibility and water resistance of the resulting polyborosiloxane resin can be improved. Furthermore, these effects can be further improved by blending the following components (d) to (f) as necessary. (d) aromatic alcohol, aliphatic polyhydric alcohol,
Phenols, aromatic carboxylic acids (e) Mixtures of organic salts such as lead, manganese, cobalt, zinc, calcium, etc. (f) Triethanolamine, monoethanolamine, diethanolamine, phenylenediamine, ethylenediamine, trimethylenediamine, diaminodiamine Nitrogen-containing compounds such as enyl ether and diaminodiphenylmethane The blending amount of components (c) to (f) is 5 to 5 parts by weight per 100 parts by weight of the total amount of components (a) and (b). 100 parts by weight,
The component (d) is 5 to 30 parts by weight, the component (e) is 0.01 to 10 parts by weight, and the number of N atoms in the component (f) is 5 to 200 per 100 B atoms in the component (b). It is desirable that the amount be The above components (d) to (f) may be used alone or in combination of two or more. The silicone resin used in the present invention includes:
In addition to pure silicone, examples include silicone alkyd, silicone polyester, silicone acrylic, silicone epoxy, and silicone urethane. Furthermore, inorganic fillers include glass, clay minerals such as asbestos, kaolinite, and montmorillonite, mica, talc, aluminum oxide, boron oxide, zirconium oxide, lead oxide, zinc oxide, magnesium oxide, tungsten carbide, titanium carbide, and molybdenum. Carbide, silicone carbide, zirconia titanium, nitrosilicon, nitroboron, boron nitride, sodium aluminate, potassium titanate, potassium silicate,
Examples include aluminum silicate, magnesium silicate, zinc silicate, zirconium silicate, titanium silicate, calcium aluminum silicate, lithium aluminum silicate, and ceramic frit made by mixing and melting several metal oxides. These may be used alone or in combination to obtain the same effect. These inorganic fillers may be natural or synthetic, but all have a particle size of 10μ.
The following fine powders are desirable. The glass winding wire of the present invention can be produced by mixing the above polyborosiloxane resin solution, silicone resin solution, and inorganic filler in a predetermined ratio, and applying and baking the mixture onto a horizontally wound glass thread, or by crushing or dissolving the mixture. The glass winding wire according to the present invention can be obtained by precipitating it in a very strong solvent to form a powder, and then applying it by powder coating. Furthermore, in the present invention, a resin insulating paint made of polyborosiloxane resin, silicone resin, and inorganic filler may be applied and baked on the conductor in advance, and then a glass thread may be wound horizontally, and then the resin may be applied in the same manner. . Note that the inorganic filler may be added to the molten resin immediately after synthesis of the polyborosiloxane resin. The blending ratio of the polyborosiloxane resin, silicone resin, and inorganic filler is 5 to 400 parts by weight, preferably 10 to 200 parts by weight, of the silicone resin per 100 parts by weight of the polyborosiloxane. A suitable range is 5 to 300 parts by weight, preferably 5 to 200 parts by weight, per 100 parts by weight of the total amount of siloxane resin and silicone resin. If the amount of silicone resin blended is less than 5 parts by weight, the flexibility and hydrolysis resistance of the baked coating will be poor, while if it exceeds 400 parts by weight, the excellent heat resistance of polyborosiloxane resin will be diminished. , and the mechanical properties become poor at temperatures above the decomposition temperature of the silicone resin. Furthermore, if the amount of inorganic filler blended is less than 5 parts by weight per 100 parts by weight of the total amount of polyborosiloxane resin and silicone resin, the heat softening properties will be poor, and if it exceeds 300 parts by weight, the coating film will be characteristics become poor. In addition, if necessary, known oxidation promoters for silicone resins, colored plaques, baking curing catalysts, and other additives may be added to the baking paint of the present invention. In addition, in the present invention, heat-resistant Ni wire,
It is preferable to use Ag wire or steel wire plated with Ag wire. In the present invention, the slipperiness of the glass winding can be improved by coating and baking an organic resin coating such as polyester, polyesterimide, polyimide, polyamideimide, polyurethane, etc. on the outermost layer. Next, an example will be described. [Example] 432g of diphenyldihydroxysilane, boric acid
83g of silicone oil and 256g of silicone oil were heated from room temperature to 400°C for 6 hours, and then condensed at 400°C for 2 hours to obtain a polyborosiloxane resin. 333g of the above resin and a 50% xylene solution of phenylmethyl silicone resin (Toshiba Silene TSR116,
(manufactured by Toshiba Silicone Co., Ltd.) 300g and magnesium oxide
120g of the mixture was mixed and dissolved in cresol to form an insulating coating, which was coated and baked using a horizontal furnace with a length of 7.4m under the baking conditions shown in the table. The test results regarding the characteristics of the glass winding according to the present invention obtained in this manner are shown in the table. In addition, the ones listed for comparison in the table are conventional H-DGC, Comparative Example 1 uses polyborosiloxane resin alone mixed with an inorganic filler, and Comparative Example 2 uses aliphatic polyimide resin varnish (commercial product). Nitztor 1500 (manufactured by Nitto Denko Corporation) was used. Moreover, in Comparative Example 3, an inorganic filler was blended with a silicone resin alone.

[Table] Furthermore, compared to Comparative Example 1, the glass winding of the present invention is clearly superior in mechanical strength. As is clear from the above examples, the glass winding according to the present invention has significantly improved dielectric breakdown strength after high-temperature heating compared to conventional H-DGC, and also has improved mechanical strength and hydrolysis resistance due to borosiloxane. This is an improvement over a single coating.

Claims (1)

[Scope of Claims] 1. A glass winding in which a glass-based wire is horizontally wound on a conductor directly or through another insulating coating, and a coating layer of a heat-resistant resin paint is further provided thereon, wherein the heat-resistant resin The paint is a silane compound represented by (A)(a) SiX ₄ , SiRX ₃ , or SiRR'X ₂ (where R and R' are an alkyl group or an aryl group, and and (b) one or more of boric acid, boric anhydride, boric acid metal salt, boron halide, and boric acid ester. (c) Silicone oil represented by the general formula below: (However, R is a methyl group or a phenyl group, n=
0 to 2300) and a polyborosiloxane resin obtained by a polycondensation reaction at 50 to 800°C, (B) a silicone resin, and (C) an inorganic filler. Glass winding. 2. Claim 1, wherein the glass thread is wound horizontally through a coating made of the (A) polyborosiloxane resin, (B) silicone resin, and (C) inorganic filler. Glass winding as described.