JPH01292704A - Self-fusion type insulated wire - Google Patents

Abstract

PURPOSE:To improve the flexibility and the heat-resisting property by forming a fusion type resin insulating layer in a coating and baking of a specific paint. CONSTITUTION:A self-fusion type resin insulating layer is formed by coating and baking a paint made by dissolving a mixture of 100 pts.wt. of a low divergent polyhydantin resin, to which 5-40 pts.wt. of urethane prepolymer and 10-100 pts.wt. of polyhydroxy polyether with the mean molecular weight 10000 or more are added, in an organic solvent. In this case, the lower divergent polyhydatin resin is a polyhydatin acid in the condition of solution or the polyhydatin acid forming a polyhydantin ring by opening the rings partially, and it is obtained normally by the reaction of a glycine derivative and isocyanate, amine, or the like. In such a composition, the flexibility, the heat- resisting property, and the coolant-resisting property can be improved, and such a wire can be used for an apparatus such as an electric motor, to which an oscillation and a high temperature of heating are applied.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a self-bonding insulated wire with excellent heat resistance and refrigerant resistance.

(Prior Art) In recent years, the demand for self-bonding insulated wires has been rapidly increasing due to the rationalization and labor saving of coil processing processes, and the applications thereof are also being expanded. In this self-bonding insulated wire, thermoplastic resins such as phenoxy resin, polyvinyl butyral resin, or polyamide resin have often been used as the resin forming the bonding resin layer.

However, as the uses of self-bonding insulated wires rapidly expand, they are being applied not only for general purposes but also as coils for devices that are subject to vibration and are used at high temperatures, such as transformers and electric motors. is being attempted.

For such applications, if the fused resin insulating layer is formed using only thermoplastic resin as described above, problems such as cracking of the coil will occur when vibration is applied and the coil is heated to a high temperature. Since resins inherently have poor heat resistance, the temperature of the entire device must be lowered before use.

Furthermore, when used in hermetic motors such as refrigerators, which is a major field of use for enameled wires, there is a problem in that the above-mentioned resins have poor freezing resistance and are therefore difficult to use.

Therefore, as a self-fusing insulated wire suitable for such uses, the self-fusing property is such that the hardness of the fusing resin insulating layer is kept at semi-hardened, so-called B stage, and is fused and hardened by heating during coil forming. Insulated wire was proposed. For example, the fused resin insulating layer is formed of a phenoxy resin to which a phenol resin or a melamine resin is added, or a polyhydroxy polyether resin mixed with a titanium compound. However, this B
The method of keeping the hardness at the level of the stage has the disadvantage that the film of the obtained insulated wire has poor flexibility, and this insulated wire cannot be particularly applied to recent high-speed automatic winding machines, and the wire Due to its extremely short shelf life, its use has been severely restricted.

(Problems to be Solved by the Invention) The present invention has been made as a result of extensive research in view of the current situation, and has developed a self-bonding insulated wire with excellent flexibility and heat resistance.

(Means for Solving the Problems) The present invention provides a self-fusing insulated wire in which a fusing resin insulating layer is provided on a conductor directly or via another insulating layer, and the self-fusing resin insulating layer is a low-branched polyhydantoin resin 1
00 parts by weight, 5 to 40 parts by weight of a urethane prepolymer, and 10 to 100 parts by weight of a polyhydroxy polyether resin with an average molecular weight of 10,000 or more, dissolved in an organic solvent. It is characterized by this.

Configuration 4 for forming a fused resin insulating layer in the present invention
Low-branched polyhydantoin resin is polyhydantoin acid in solution state or partially ring-opened to form a polyhydantoin ring, and is usually obtained by reacting glycine derivatives with isocyanates, amines, etc. be. The method for producing the polyhydantoin resin solution is, for example, the method described in Japanese Patent Publication No. 44-20115. Further, the lower the degree of branching of polyhydantoin, the more suitable it is, and a suitable commercially available product is Gistherm PH-20, manufactured by Bayer AG, Germany.

The urethane polymer, which is the second component, is an oligomer obtained by reacting a polyvalent isocyanate and a polyhydric alcohol, such as a polyvalent isocyanate such as 4゜4'-diphenylmethane diisocyanate and a polyhydric alcohol such as glycerin. Although it is preferable to use prephotomers of combinations of other polyhydric isocyanates and polyhydric alcohols, it is also possible to use prephotomers of combinations of other polyhydric isocyanates and polyhydric alcohols. Its structural formula is the following formula (1
) as shown.

Specifically, the product name is MS-50 manufactured by Nippon Polyurethane Co., Ltd.
It is obtained by heating and reacting a stabilized isocyanate, glycerin, and zinc octylate at 120°C for 3 hours or more using a catalyst.

Further, as the third component, a polyhydroxy polyether resin having a molecular weight of 10,000 or more, the following structural formula (2) is used.
and (3).

(However, m and n are positive integers, and R represents a fatty acid or an aromatic residue.) The reason why the average molecular weight of this polyhydroxypolyether resin was limited to 10,000 or more is that if it is less than 10,000, This is because the flexibility of the fusible insulated wire is poor.

Commercially available polyhydroxy polyether resins include YP-50 (trade name manufactured by Tobu Kasei Co., Ltd.), H157, and H3.
5B (trade name manufactured by Dainippon Ink Co., Ltd.).

Accordingly, in the present invention, the amount of urethane polymer blended is 5 to 100 parts by weight of the above-mentioned low-branched polyhydantoin resin.
The reason why the amount is limited to 40 parts by weight is that if the amount of the urethane prepolymer is less than 5 parts by weight, the effect of crosslinking and curing the low-branched polyhydantoin resin and polyhydroxyether resin will be poor and the resulting fusion will be poor. The resin insulation layer is heat resistant.

It had poor refrigerant resistance. If the amount exceeds 40 parts by weight, the flexibility of the fused resin insulating layer coating will be poor.

The reason why the amount of polyhydroxypolyether resin added is limited to 10 to 100 parts by weight per 100 parts by weight of low-branched polyhydantoin resin is that if the amount is less than 10 parts by weight, the flexibility of the fusion resin insulation layer film will decrease. In addition, the temperature required for adhesion is too high, which is not practical. Moreover, if the amount exceeds 100 parts by weight, the heat resistance and refrigerant resistance of the film will decrease.

(Example) Examples (1) to (5), Comparative Examples (1) and (2) A low-branched polyhydantoin resin solution (manufactured by Bayer AG, Germany, trade name Registherm PH20, solid A cresol/naphtha solution containing 30% polyurethane prepolymer, and a cresol/naphtha solution containing 30% polyhydroxypolyether resin were charged into a flask, and the mixtures were prepared as shown in Table 1. A self-fusing resin paint was obtained by heating and stirring under reaction conditions.

The urethane prepolymer was obtained by charging 100 parts by weight of MS-50 (trade name manufactured by Nippon Polyurethane Industries, Ltd.) and 12 parts by weight of glycerin together with zinc octylate in a flask using quinrenol as a solvent, and heating and stirring at 120°C for 3 hours. It is.

Next, the above-mentioned self-fusing paint was applied and baked three times on an esterimide insulated copper wire having a diameter of 1.0 mm to produce a self-fusing insulated wire of the present invention and a self-fusing insulated wire of a comparative example, respectively.

The baking conditions were a furnace length of 3 m, a furnace temperature of 300°C, and a line speed of 7.5.
The vehicle was run at a distance of 12 m.

Comparative example (3) Esterimide insulated copper wire with a diameter of 1.0 mm was wired with a diameter of 6.5 mm.
After creating a helical coil with a length of 80 m+* by tightly winding it around a metal round bar of 1.5 mm, it was coated with epoxyphenol-impregnated varnish (product name: PD9, manufactured by P, D George, USA).
23) and heat-cured at 160° C. for 3 hours to obtain a comparative self-bonding insulated wire.

The thus obtained insulated wires of the present invention and comparative insulated wires were subjected to an adhesive strength test, a flexibility test, and a refrigerant extraction test to determine their performance, and the results are shown in Table 1.

However, all values in the self-discipline indicate parts by weight. For the adhesive strength test, each insulated wire was tightly wound around a metal round rod with a diameter of 6.5 mm to create a helical coil with a length of 80", and this was 150" in length. After heating for 1 hour at
The adhesive strength at room temperature and 120° C. is determined by n1 according to STM D-2159.

In addition, in the flexibility test, each insulated wire was
The number of cracks in the film was determined to be 11 by winding the film in turns.

In addition, for the refrigerant extraction test, 2g of the film layer of each insulated wire was sampled, and after cleaning it with Freon R-113, it was heated at 150° for 1 hour.
This was heated for 120'
After heating the autoclave for 72 hours, the autoclave was cooled, Freon was vapor-deposited, the weight of the extract was measured, and the pouring rate was calculated using the following formula.

(Effects of the Invention) The self-bonding insulated wire of the present invention has excellent flexibility, heat resistance, and refrigerant resistance, so it can be used in devices that are subject to vibration and are heated to high temperatures, such as transformers and electric motors. It is extremely useful and can be used.

Procedural amendment 1989 Month/day Director General of the Japan Patent Office Yoshi 1) Tsuyoshi Moon 1, Indication of the case Japanese Patent Application No. 1983-119210 2, Name of the invention Self-fusing insulated wire 3, Person making the amendment Relationship with the case Patent applicant (529) Furukawa Electric Co., Ltd. 4, Agent 3-7-2 Kasumigaseki, Chiyoda-ku, Tokyo 100 Phone: 03 (502) 3181 (main representative) 6, Subject of amendment 7, Contents of amendment (1) ) On page 2, line 19 of the specification box, "freezing resistance" is corrected to "refrigerant resistance."

(2) "Prephotomer" on page 5, lines 9-10 of specification box is corrected to "prepolymer."

(3) In the fifth to sixth lines from the bottom of page 5 of the specification, the words "with glycerin" are corrected to "with glycerin."

(4) "Polyurethane prepolymer" on page 7, lines 19-20 of the specification is corrected to "urethane prepolymer."

(5) "Xylenol" on page 8, lines 7-8 of the specification box is corrected to "xylenol."

(6) The text "r7.5n-12m" on page 5, line 15 of the specification is corrected to "7.5-12m/min."

(7) Table 1 on page 10 of the specification is corrected as follows.

Table 1 (8) Specification Section, page 11, line 15, ``Freon is evaporated'' is corrected to ``Freon is evaporated.''

(9) The formula on page 11, line 18 of the specification cylinder is corrected as follows.

Record

Claims (1)

[Claims] In a self-bonding insulated wire in which a fusible resin insulating layer is provided on a conductor directly or via another insulating layer, the fusible resin insulating layer is composed of 100 parts by weight of a low-branched polyhydantoin resin and 5 parts by weight of a urethane prepolymer. ~40 parts by weight and average molecular weight 1
0000 or more polyhydroxy polyether resin 10~
1. A self-bonding insulated wire, characterized in that it is formed by applying and baking a paint containing a mixture of 100 parts by weight dissolved in an organic solvent.