JPH0693231A - Resin composition for sealing coil - Google Patents

Abstract

PURPOSE:To obtain a resin composition for sealing coils, providing coils having excellent bonding properties in sealing and molding insulated and coated electric wire into a coil shape, comprising a thermosetting resin component and an elastomer component. CONSTITUTION:A resin composition comprises (A) a thermosetting resin having <=preferably 90 seconds curing time, more preferably 60 seconds (at 160 deg.C hot plate temperature) and (B) an elastomer component having 30,000-1,000,000 average molecular weight and is used for sealing and molding insulated and coated electric wire into a soil shape. In the case wherein the component A is preferably a phenol resin, the component B is polyvinyl formal etc., in the combination, both the components in the ratio of the component A:B of 5:95-80:20 are dissolved in a solvent (e.g. acetone or methanol) having <=70 deg.C boiling point to give a resin composition for sealing coil. Electric wire is insulated and coated with the resin composition, coiled on a winding jig into coil. In the operation, hot air is sent to the coil, volatile components such as the solvent are vaporized, reaction of the sealing resin is advanced to fuse and cure the resin composition.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention applies a fixing resin to an insulating coated conductive wire, heats the resin-attached conductive wire, volatilizes a solvent, fuses the conductive wire, and cures the resin to a predetermined level. The present invention relates to a resin composition for fixing coils, which is used for fixing and molding into a shape.

[0002]

2. Description of the Related Art As a method for fixing a coil in a predetermined shape, a method of applying a current by using a self-bonding wire as described in Japanese Patent Laid-Open No. 56-103410 and fusing it by its heat is used. There is. According to this method, the workability and the like are good, but the self-bonding wire is expensive. There is also a method in which the self-bonding wire is swollen in advance with a solvent to be bonded, but the cost of the self-bonding wire is high, and the swollen solvent remains in the coil and the heat resistance of the coil is reduced.

[0003]

The method using the self-bonding wire as described above has a problem that the self-bonding wire is expensive and the cost of the coil is increased. The present invention provides a resin composition for coil fixing suitable for fixing and molding a coil into a predetermined coil shape without using an expensive self-bonding wire.

[0004]

That is, the present invention is a resin composition used for firmly molding a conductive wire having an insulating coating on the surface into a coil shape, which comprises a thermosetting resin component and an elastomer component. And a resin composition for coil fixing. As the insulating coated conductive wire used in the present invention, a conductive wire coated with a polyester resin, a polyesterimide resin, a polyimide resin, a polyamideimide resin or the like can be used.

As the thermosetting resin, phenol resin,
Epoxy resin, unsaturated polyester, etc. can be used. It is preferable that the curing time of the thermosetting resin is adjusted to 90 seconds or less. If the curing time is 90 seconds or longer, the speed of the coated conductive wire cannot be increased. Further, when the speed is increased, the curing becomes insufficient, and the sticking property and the coil characteristics deteriorate. From this, it is more preferably 60 seconds or less. As the elastomer, it is possible to use polyvinyl acetate, phenoxy resin, polyvinyl formal, polyvinyl butyral, polybutadiene, epoxidized polybutadiene, ethylene vinyl acetate copolymer, etc. These elastomers can be used alone or in combination of two or more kinds. Is. The average molecular weight of the elastomer is preferably 30,000 to 1,000,000. If it is 30,000 or less, the sticking property will be poor, and if it is 1,000,000 or more, the solubility will be poor, and the viscosity of the resin will be high and the workability will be poor. Further, as the elastomer, a so-called reactive elastomer having reactivity with the thermosetting resin used is particularly preferable.

The ratio (weight ratio) of the elastomer to the thermosetting resin is preferably 5:95 to 80:20, more preferably 10:90 to 50:50. When the ratio of the elastomer becomes small as 5:95 or less, the sticking property is deteriorated. On the other hand, when the ratio of the elastomer is high, such as 80:20 or more, the curability decreases.

Preferred combinations of thermosetting resins and elastomers include polyvinyl formal, polyvinyl butyral and epoxidized polybutadiene for phenolic resins. Examples of the epoxy resin include phenoxy resin, polyvinyl formal, polyvinyl butyral, and epoxidized polybutadiene. Examples of unsaturated polyesters include polybutadiene. The solvent of the resin is not particularly limited, but the boiling point of the solvent of the resin is 7 from the viewpoint of the feed rate of the coated conductive wire and the remaining solvent after drying.
It is preferably 0 ° C or lower. If it is 70 ° C. or higher, the feed rate must be slowed down and the residual solvent tends to remain. Specifically, there are acetone, methyl acetate, tetrahydrofuran, hexane, methanol and the like. These solvents may be used alone or in combination of two or more. The method of applying the resin varnish is not particularly limited, and there are various methods such as a method of dipping and a method of impregnating felt and applying. The coated conductive wire coated with the varnish is heated immediately before or at the same time as winding the conductive wire to volatilize the volatile components such as the solvent contained therein and to advance the reaction of the fixing resin to fuse and cure. The heating method is also not particularly limited, and may be a method of blowing hot air from a nozzle to dry it or a method of passing it through a drying furnace. The drying temperature cannot be generally determined because it depends on the winding speed. The hot air temperature when drying with the hot air coming out of the nozzle at a feed rate of the coated conductive wire of 150 m / min is 100-
400 ° C. is preferred. The solvent remains below 100 ° C. Four
At a temperature of 00 ° C. or higher, the reaction of the coil fixing resin composition proceeds too much to lose the adhesiveness and deteriorate the adhesiveness.

[0008]

EXAMPLES Examples of the present invention will be described below. Example 1 50 g of S-REC B BX-5 (polyvinyl butyral, average molecular weight 140,000, trade name manufactured by Sekisui Chemical Co., Ltd.)
Was dissolved in a mixed solvent of 100 g of acetone and 100 g of methanol. Furthermore, 100 g of VP-11N # 100 (phenolic resin, curing time 35 seconds (hot plate temperature 160 ° C., trade name of Hitachi Chemical Co., Ltd.)) was added and well dissolved. The nonvolatile content (105 ° C, 2 hours) of this solution is 15
% To obtain a coil fixing resin composition A. Felts impregnated with the coil-fixing resin composition A were overlapped with each other, and PEW (polyester resin-coated conductive wire) having a diameter of 0.7 mm was passed through the felt to adhere the coil-fixing resin composition A thereto. The adhered resin adhered P
The EW was wound around a stainless steel winding jig having a diameter of 10 cm to form a coil. The fixing resin-attached PEW was sent with hot air so that both the jig and the jig were heated. Winding speed 10
The temperature was 0 m / min and the hot air temperature was 200 ° C.

Example 2 50 g of YP-50 (phenoxy resin, average molecular weight 40,000, trade name of Toto Kasei Co., Ltd.) was dissolved in 100 g of tetrahydrofuran. Also, 50 g of Epicoat 1001 (bisphenol type epoxy resin, trade name of Yuka Shell Epoxy Co., Ltd.) is dissolved in 100 g of acetone,
Further, 2-ethyl-4-methyl-imidazole was added so that the curing time at a hot plate temperature of 160 ° C. was 60 seconds. After the above YP-50 solution was added to this, it was diluted with tetrahydrofuran so that the nonvolatile content (105 ° C., 2 hours) was 20%, and the coil fixing resin composition B was added.
Got Felts impregnated with the coil-fixing resin composition B were superposed in the same manner as in Example 1, and the diameter of the felt was 0.7.
mm of PEW (polyester resin-coated conductive wire) is passed through to attach the resin composition B for coil fixing, and the fixed resin-attached PEW is wound around a stainless steel winding jig to form a coil. The hot air was sent so that both the vicinity of the PEW to which the fixed resin-attached PEW was wound around the jig and the jig were heated. Winding speed 100m / min, hot air temperature 2
It was 00 ° C.

COMPARATIVE EXAMPLE A coil fixing resin composition C was obtained by diluting only VP-11 # 100, which is a thermosetting phenol resin, with methanol so that the nonvolatile content was 30%. As in Example 1, felts impregnated with the coil fixing resin composition B were superposed, PEW (polyester resin coated conductive wire) having a diameter of 0.7 mm was passed through the felt, and the coil fixing resin composition B was adhered thereto. . The fixed resin-attached PEW was wound around a stainless steel winding jig having a diameter of 10 cm to form a coil. Hot air was blown so that both the vicinity of the PEW to which the fixed resin-attached PEW was wound around the jig and the jig were heated. The winding speed was 100 m / min and the hot air temperature was 200 ° C. Example 1,
Table 1 shows the adhesion of the coils obtained in Example 2 and Comparative Example.

[0011]

[Table 1]

[0012]

As is clear from the results shown in Table 1, according to the present invention, the use of the coil fixing resin composition comprising the thermosetting resin component and the elastomer component as the fixing resin provides good fixing property. It has become possible to obtain various coils.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Munekazu Suzuki 172-1 Kagoku, Yuki City, Ibaraki Prefecture Hitachi Chemical Co., Ltd. Minami Yuki Plant (72) Inventor Naoki Ishikawa 1772, Kagoku, Yuki City, Ibaraki Prefecture Hitachi Kasei Kogyo Co., Ltd. Minami-Yuki Plant (72) Inventor Kunitoshi Kogure 3310 Higashi-Obokata, Higashimura, Sawa-gun, Gunma Prefecture Misennai Stock Company (72) Inventor Hideo Kawashima 714 Uesano-cho, Takasaki, Gunma Prefecture

Claims (3)

[Claims] 1. A resin composition for fixing a coil of a conductive wire coated with an insulating material, the resin composition comprising a thermosetting resin component and an elastomer component. 2. A resin composition comprising a thermosetting resin component having a curing time of 90 seconds (hot plate temperature of 160 ° C.) or less and an average molecular weight of 30,000 to.
The resin composition for coil fixing according to claim 1, which comprises 1 million elastomer components. 3. The resin composition for coil fixing according to claim 1, wherein the resin composition contains a solvent having a boiling point of 70 ° C. or lower.