JP2010170711A - Self-fusion insulated wire, and motor for driving compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a self-fusion insulated wire which has a superior mechanical strength, such as wear resistance, and heat resistance, and shows superior winding properties even for use in manufacturing a motor with high occupancy specifications, and also to provide the motor using this self-fusion insulated wire. <P>SOLUTION: The self-fusion insulated wire includes a fusion coat composed of a phenoxy resin formed by copolymerizing an epoxy monomer containing bisphenol A, bisphenol S and a biphenyl-type epoxy unit, and a resin composition containing a cross-linking agent. Otherwise, the self-fusion insulated wire includes the fusion coat composed of the resin composition containing a bisphenol A-type epoxy resin, a bisphenol S-type epoxy resin, a biphenyl-type epoxy resin and the cross-linking agent. The motor using these self-fusion insulated wires is also provided. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a self-bonding insulated wire used as a winding of a compressor driving motor, and a compressor driving motor using the self-bonding insulated wire.

  Compressor drive motors (compressor drive motors, hereinafter simply referred to as “motors”) used in refrigeration equipment such as air conditioners and refrigerators are self-fused to suppress coil vibration when the motor output is large. A coil is formed by winding an insulating insulated wire. A self-bonding insulated wire is an insulated wire in which an outermost layer of the insulation film is provided with a fusion film formed by applying a resin having a fusion property. It is fixed and coil vibration is suppressed.

  Accordingly, the fusion coating is required to have good fusion properties and also to have good flexibility in order to suppress the occurrence of cracks during winding. Furthermore, in order to improve the efficiency of the motor, the fusion coating is required to have excellent mechanical strength and good slipperiness of the surface, and particularly excellent wear resistance and heat resistance are required.

  That is, in order to improve the efficiency of the motor, it is desired to wind more insulated wires in the slot of the motor core to increase the space factor, but the wear resistance of the fusion coating is low and the surface If the slipperiness is poor, a motor with a high space factor specification will cause a problem that the fusion coating is likely to be scraped off during winding, and these improvements are desired. In addition, in order to prevent problems such as the insulation layer softening due to heat generated when the motor is locked or during operation and the conductors come into contact with each other and short-circuiting, a high softening resistance temperature (temperature at which the insulation layer softens) is required. That is, improvement in heat resistance is desired.

  When the fusion coating is made of a thermoplastic resin, a motor used in a high temperature atmosphere requires a high melting point resin to prevent melting of the fusion coating during motor operation. Then, it is necessary to perform fusion at a high temperature, which causes a problem of deteriorating or melting the insulating resin, lead wire coating resin, etc. of the motor core.

  Therefore, a thermosetting resin is generally used for the fused film of the insulated electric wire of the motor used in a high temperature atmosphere, and the thermosetting type fused film is formed in a semi-cured or uncured state. A method is adopted in which the electric wires are fixed together by curing the fusion coating after winding. As this thermosetting resin, for example, in Patent Document 1, a thermosetting type obtained by mixing a polyhydroxy ether resin having a molecular weight of 20000 or more, a polysulfone resin, and a crosslinking agent having two functional groups in one molecule. A resin (thermosetting self-bonding insulating material) is disclosed.

JP 2006-352962 A

  However, the mechanical strength of the fusion-bonded film obtained from the thermosetting resin described in Patent Document 1 is still not sufficient, and the wear resistance is particularly insufficient, and an improvement thereof is desired. Further, improvement in heat resistance is also desired.

  The present invention solves the above-mentioned problems, has a fusion film having better mechanical strength such as wear resistance and heat resistance, and is excellent even when used for manufacturing a motor with a high space factor specification. It is an object of the present invention to provide a self-bonding insulated wire that exhibits excellent winding properties.

As a result of intensive studies, the present inventor has made a thermosetting resin (thermosetting type fusion) containing a phenoxy resin obtained by copolymerizing an epoxy monomer containing bisphenol A, bisphenol S and a biphenyl type epoxy unit, and a crosslinking agent. A thermosetting type fusion resin comprising a mixture of a bisphenol A type epoxy resin, a bisphenol S type epoxy resin and a biphenyl type epoxy resin and a crosslinking agent. By forming a fused film using the composition,
The present inventors have found that a fused film excellent in mechanical strength such as wear resistance and heat resistance can be obtained, and completed the present invention having the following constitution.

  The invention according to claim 1 has a fusion film comprising a phenoxy resin obtained by copolymerizing an epoxy monomer containing bisphenol A, bisphenol S and a biphenyl type epoxy unit, and a resin composition containing a crosslinking agent. It is a self-bonding insulated wire that is characterized.

  Here, the phenoxy resin is a high molecular weight polyhydroxy polyether synthesized by reacting a hydroxyl group such as bisphenol or biphenyl with epihalohydrin or a low molecular weight epoxy, and is also a high molecular weight epoxy resin.

  Bisphenol A constituting the phenoxy resin is 2,2-bis (p-hydroxyphenyl) propane, and bisphenol S is 2,2-bis (p-hydroxyphenyl) sulfone. Those having a substituent such as an alkyl group or a bromo group in the ring can also be used as bisphenol A or bisphenol S in the present invention.

  The epoxy monomer containing a biphenyl type epoxy unit is an epoxy compound having a biphenyl skeleton represented by the following formula.

  In the formula, R is hydrogen, an alkyl group, a bromo group or the like, and each R may be different from each other. Further, n is usually 1, but two or more are also used. An epoxy monomer containing a biphenyl type epoxy unit can be obtained by condensation of di-p-hydroxybiphenyl (including those having a substituent on the aromatic ring) and epihalohydrin. The conditions for the condensation reaction can be the same as those for known condensation reactions. An epoxy monomer that does not contain the biphenyl skeleton may be used in combination with an epoxy monomer that contains a biphenyl type epoxy unit within a range that does not impair the spirit of the present invention.

  A commercial item may be used as an epoxy monomer containing the biphenyl type epoxy unit used for the present invention. Specifically, trade names: YX4000, YX4000H, YL6121H, YL6640, YL6677, etc., manufactured by Japan Epoxy Resin Co., Ltd. can be mentioned.

  The invention according to claim 2 is the self-bonding insulated wire according to claim 1, wherein the weight average molecular weight of the phenoxy resin is 5000 or more. Here, the weight average molecular weight is a value in terms of polystyrene measured by GPC. The weight average molecular weight of the phenoxy resin is preferably 5000 or more, more preferably 15000 or more, from the viewpoint of mechanical strength and flexibility.

  Invention of Claim 3 exists in the range from which content of the said bisphenol S contained in a resin composition will be 0.2-0.5 by molar ratio with respect to the whole quantity of bisphenol S and bisphenol A. The self-bonding insulated electric wire according to claim 1 or claim 2, wherein Since the compressor driving motor in which the self-bonding insulated wire of the present invention is used is operated in a refrigerant and refrigeration oil environment, the insulated wire is desired to have refrigerant resistance and refrigeration oil resistance. When the content of bisphenol S contained in the composition is less than 0.2 mol with respect to a total of 1 mol of bisphenol S and bisphenol A, the components of the fused layer are extracted in the refrigerant and refrigerating machine oil, and turbidity occurs. It tends to occur. On the other hand, when it exceeds 0.5 mol, there is a problem that whitening of the film tends to occur after the refrigerant treatment, and the fusion start temperature becomes high. Accordingly, a range of 0.2 to 0.5 in terms of molar ratio is preferable.

  The said phenoxy resin used for manufacture of the self-bonding insulated wire of this invention is obtained by copolymerizing the epoxy monomer containing bisphenol A, bisphenol S, and a biphenyl type epoxy unit. In this copolymerization reaction, an epoxy group of an epoxy monomer containing a biphenyl type epoxy unit and a hydroxyl group of bisphenol A and bisphenol S react to form an ether bond to obtain a copolymer. In addition, other bisphenols, other bifunctional epoxy compounds, epihalohydrins, etc. are added to epoxy monomers containing bisphenol A, bisphenol S and biphenyl type epoxy units within the range not impairing the gist of the present invention. It can also be done.

  When the copolymerization reaction is carried out only with epoxy monomers containing bisphenol A, bisphenol S and biphenyl type epoxy units, the total number of equivalents of bisphenol A and bisphenol S is equal to the number of equivalents of epoxy monomers containing biphenyl type epoxy units. The closer it is to a higher molecular weight copolymer is obtained. Since the weight average molecular weight of the phenoxy resin is preferably 15000 or more, the ratio between the two is preferably selected so that the molecular weight can be obtained.

  This copolymerization reaction is performed, for example, by mixing a raw material such as an epoxy monomer containing bisphenol A, bisphenol S, and a biphenyl type epoxy unit and a catalyst in a solvent such as cyclohexanone and heating at a reaction temperature of about 120 to 160 ° C. It can be carried out. Usually, the time to the reaction end point is about 5 to 10 hours, but the end point of the reaction can be confirmed by monitoring a change in viscosity or the like.

  As the catalyst used for the copolymerization reaction, an alkali is used, and among them, an amine catalyst is preferable. By using an amine-based catalyst, a self-bonding insulated electric wire with further excellent refrigerant resistance and refrigeration oil resistance can be obtained. When a phenoxy resin obtained by using a catalyst other than an amine such as imidazole is used, the glass transition temperature Tg of the fusion coating is lowered during the operation of the motor, and the fusion material is added to the refrigerating machine oil. Problems such as an increased extraction amount are likely to occur.

  For example, when the cross-linking agent is a stabilized isocyanate, after the fusion treatment, when the refrigeration oil reaches a high temperature due to operation of the motor, the urethane bond between the phenoxy resin and the cross-linking agent is dissociated by the residual catalyst, and the glass transition temperature Tg In addition, the extract tends to increase and the problem of whitening the refrigerating machine oil tends to occur. However, the amine-based catalyst has a relatively low boiling point and is likely to volatilize during baking for producing a semi-cured state during the production of the electric wire, so that the amount of catalyst remaining in the film is relatively small. Further, even if it remains, since its activity as a catalyst is low, the problem of dissociating urethane bonds and lowering the glass transition temperature Tg is small, and the problem of cloudiness of refrigerating machine oil hardly occurs. The amine catalyst preferably has a boiling point of 250 ° C. or lower.

  Even when an amine-based catalyst is used, it is difficult to volatilize all the amine-based catalyst at that time by baking to a semi-cured state at the time of producing the electric wire. Therefore, it is preferable to provide a step of reducing the residual amount of the catalyst after copolymerization. In particular, it is more preferable that the residual amount of the amine-based catalyst is 100 ppm or less with respect to the phenoxy resin because the cloudiness of the refrigerating machine oil can be effectively suppressed. . Moreover, when the residual amount of the amine-based catalyst is 100 ppm or less, it is possible to suppress the problem that the fusing power of the fusing film decreases with time.

  Examples of a method for reducing the residual catalyst amount after copolymerization include a method in which the reaction system after the reaction is heated to a boiling point or higher of the amine catalyst to volatilize and remove the amine catalyst. In order to facilitate volatilization of the amine-based catalyst, it may be heated after being diluted with a solvent.

  The cross-linking agent used in the present invention is a compound that has two or more functional groups in one molecule and cross-links between phenoxy resins. For example, divalent stabilized isocyanate, urea resin, benzoguanamine resin, 2 And divalent organic acid derivatives.

  Divalent stabilized isocyanates include tetramethylene diisocyanate, hexamethylene diisocyanate, paraphenylene diisocyanate, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, xylylene diisocyanate, diphenylmethane-4,4 "-diisocyanate, Examples include those obtained by masking an isocyanate compound such as diphenyl ether-4,4′-diisocyanate with a compound having a phenolic hydroxyl group, an alcoholic hydroxyl group, or the like.

  Specifically, product name: Millionate MS-50, Coronate 2501, 2507, 2513, 2515 manufactured by Nippon Polyurethane Industry Co., Ltd., and product names: Duranate 17B60-PX, TPA-B80X, MF-B60X, MF manufactured by Asahi Kasei Commercial products such as -K60X and E402-B-80T can be used.

  Moreover, as a urea resin, the commercial name made from Nippon Cytec Co., Ltd .: UFR65, UFR300, and as the benzoguanamine resin, commercial names made by Nihon Cytec Co., Ltd .: Cymel 1123, My Coat 102, 105, 106, 1128, etc. are illustrated. can do.

  Examples of the divalent organic acid include phthalic acid, isophthalic acid, terephthalic acid, oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, maleic acid, and fumaric acid. Examples of the divalent organic acid derivative include these acid chlorides.

  The content of the crosslinking agent is preferably in the range of 10 to 20% by weight with respect to the total weight of the phenoxy resin, that is, the epoxy monomer containing bisphenol A, bisphenol S and biphenyl type epoxy units (Claim 5). If the amount of the cross-linking agent is less than 10% by weight, the fusion force in a high temperature atmosphere and in refrigerant / refrigerant oil may be easily reduced, and the refrigerant extraction rate may increase. Conversely, if the amount exceeds 20% by weight, fusion is difficult. It may become.

  A solution (varnish) of the resin composition containing the phenoxy resin and the crosslinking agent is obtained by dissolving the required amount of the phenoxy resin and the crosslinking agent in an organic solvent. Examples of the organic solvent include cyclohexanone. The varnish is applied onto the insulating film of the insulated wire and enamel-baked in a semi-cured state by a conventional method to form a fused film. The self-bonding property of the present invention (the invention according to claims 1 to 5) An insulated wire is obtained.

  The invention described in claim 6 has a fusion film comprising a resin composition containing a bisphenol A type epoxy resin, a bisphenol S type epoxy resin, a biphenyl type epoxy resin, and a crosslinking agent. It is a wearable insulated wire. Even with a resin composition in which a crosslinking agent is added to a mixture of bisphenol A type epoxy resin, bisphenol S type epoxy resin, and biphenyl type epoxy resin, a fusion film excellent in mechanical strength such as abrasion resistance and heat resistance can be obtained. It can be formed, and an excellent self-bonding insulated electric wire can be manufactured.

  Here, the bisphenol A type epoxy resin is obtained by reacting bisphenol A with epihalohydrin, and this reaction can be carried out by known methods and conditions. The bisphenol S type epoxy resin is obtained by reacting bisphenol S with epihalohydrin, and this reaction can be carried out by a known method and conditions. The bisphenol A type epoxy resin and the bisphenol S type epoxy resin preferably have a molecular weight that can be referred to as a phenoxy resin. By having a certain molecular weight, it becomes easy to satisfy physical properties such as flexibility.

  Commercial products can be used as the bisphenol A type epoxy resin and the bisphenol S type epoxy resin. Examples of commercially available products include YP-40ASM40, YP-50 (bisphenol A type phenoxy resin: manufactured by Tohto Kasei Co., Ltd.), YPS-007A30 (bisphenol S type phenoxy resin: manufactured by Tohto Kasei Co., Ltd.), and the like.

  The biphenyl type epoxy resin used in the invention described in claim 6 is a polymer of an epoxy monomer containing the biphenyl type epoxy unit used in the invention described in claim 1. However, what has a high molecular weight of the grade which can be called a phenoxy resin is preferable. Specific examples include trade names: YX8100BH30, YX6954BH30 manufactured by Japan Epoxy Resin Co., Ltd.

  As the crosslinking agent used in the invention described in claim 6, the same crosslinking agent as that used in the invention described in claim 1 can be used.

  A solution of a resin composition containing a phenoxy resin and a crosslinking agent (varnish) by dissolving the required amount of the bisphenol A type epoxy resin, bisphenol S type epoxy resin, biphenyl type epoxy resin, and crosslinking agent in an organic solvent. ) Is obtained. Examples of the organic solvent include cyclohexanone. The varnish is applied onto the insulation film of the insulated wire and enamel-baked in a semi-cured state by a conventional method to form a fusion film, and the self-fusing insulation of the present invention (the invention according to claim 6). An electric wire is obtained.

  In either of the inventions described in claim 1 and claim 6, if a lubricant is contained in the fusion coating, the slipping property of the winding is improved, so that the winding property is improved and the high occupation is achieved. This is preferable because it is easy to increase the product ratio.

  Lubricants include polyethylene wax, microcrystalline wax, fluorine wax such as polytetrafluoroethylene, amide wax such as stearamide, beeswax, carnauba wax, montan wax, etc., and modified molecular ends of these waxes Can be blended alone or in combination.

  A lubricant may be directly added to the resin composition (varnish) containing the phenoxy resin and the crosslinking agent to form a fusion coating. Alternatively, after forming a fusion coating containing no lubricant, a multilayer coating may be formed by forming a fusion coating containing a lubricant in the outermost layer.

  The amount of lubricant added in the fusion coating (in the outermost fusion coating when the fusion coating has a multilayer structure) is the resin composition (in the invention described in claim 1, the phenoxy resin and the crosslinking agent). In the invention according to claim 6, the total resin content of the bisphenol A type epoxy resin, the bisphenol S type epoxy resin, the biphenyl type epoxy resin, and the crosslinker is 1 to A range of 10% by weight is preferred. If it is less than 1% by weight, the slipping property that facilitates winding of a motor with a high space factor cannot be obtained. On the other hand, if it exceeds 10% by weight, the fusing force in the fusing process is reduced. .

  By winding the self-bonding insulated electric wire of the present invention (Claims 1 to 7) to produce a coil, and then performing a heat treatment, a motor in which the electric wires are fixed to each other and coil vibration is suppressed is obtained. Since the self-bonding insulated wire according to the present invention has excellent winding properties, a compressor driving motor with a high space factor can be obtained by using this insulated wire. The present invention also provides a motor for driving the compressor (claim 8).

  The self-bonding insulated electric wire of the present invention has a fusion coating excellent in mechanical strength such as wear resistance and heat resistance, and exhibits excellent winding properties even in a motor with a high space factor specification. In addition, the compressor driving motor obtained by using the self-bonding insulated electric wire is one in which coil vibration is suppressed and can have a high space factor specification.

  Next, the best mode for carrying out the present invention will be described by way of examples. However, the scope of the present invention is not limited only to these examples, and the scope of the present invention is not impaired. Various changes can be made.

[Preparation of resin composition]
Example 1 and Comparative Example 1
Based on the formulation shown in Table 1, a resin composition solution (varnish) was prepared by the following procedure. Specifically, first, cyclohexanone is put into a flask equipped with a thermometer, a cooling tube, a calcium chloride packed tube, and a stirrer, and an epoxy monomer containing bisphenol A, bisphenol S, and a biphenyl type epoxy unit ( Trade name: YX4000H, manufactured by Japan Epoxy Resin Co., Ltd.) or bisphenol A type epoxy resin (trade name: YD-128, manufactured by Tohto Kasei Co., Ltd.) and triethylamine (amine catalyst, manufactured by Wako Pure Chemical Industries, Ltd.) as a catalyst are charged. Then, it heats up stirring from room temperature to 80 degreeC, and dissolves each material in cyclohexanone.

  After confirming dissolution, the temperature is increased from 80 ° C. to 135 ° C. over 2 hours, and the reaction is allowed to proceed while maintaining the temperature at 135 ° C. The state of the reaction is observed by monitoring the viscosity, and after confirming that the reaction end point has been reached, RC-140 (purified cresol, manufactured by Kono Pharmaceutical Co., Ltd.) (1) is added and cooled to room temperature.

  Next, a 35 wt% solution (solvent RC-140) of Millionate MS-50 (stabilized isocyanate, manufactured by Nippon Polyurethane Co., Ltd.) as a crosslinking agent, T-15P-2 (polyethylene wax, manufactured by Gifu Shellac Co., Ltd.) as a lubricant, and RC-140 (2) was added and mixed to obtain the thermosetting fused resin composition varnishes of Example 1 and Comparative Example 1, respectively.

[Production of self-bonding insulated wires]
An insulating resin varnish Isomid 40SM-45 (polyesterimide varnish, manufactured by Hitachi Chemical Co., Ltd.) is applied to the surface of a copper wire (conductor) having a diameter of about 0.75 mm by a conventional method, and baked at 450 ° C. to a thickness of about 18 μm. One layer was formed. Next, an insulating resin varnish HI406E-34 (polyamideimide varnish, manufactured by Hitachi Chemical Co., Ltd.) is applied to the surface of the first layer by a conventional method, and baked at 450 ° C. to form a second layer having a thickness of about 7 μm. An insulating film consisting of two layers was formed. Thereafter, each of the thermosetting fused resin composition varnishes obtained in [Preparation of resin composition] is coated on an insulating film by a conventional method and baked at 300 ° C., and the thicknesses shown in Table 2 are fused. A film was formed to obtain a self-bonding insulated wire.

[Mechanical strength test]
Using each of the obtained self-bonding insulated wires, the mechanical strength was measured by the following method for the following items.
(Abrasion resistance) Measured according to “unidirectional wear” of JIS C30039.
(Dielectric breakdown voltage) The dielectric breakdown voltage was measured in accordance with JIS C3003 2) “Method from 2”. The measurement was performed 3 times and the average was calculated.
[Heat resistance] Measured according to “Method A” of JIS C3003 11.
These measurement results are shown in Table 3.

  As is clear from the results shown in Table 3, in Example 1 (invention example) using a phenoxy resin obtained by copolymerizing an epoxy monomer containing bisphenol A, bisphenol S and a biphenyl type epoxy unit, the biphenyl type was used. Compared with the comparative example 1 which used the bisphenol A type epoxy resin instead of the epoxy monomer containing an epoxy unit, the outstanding abrasion resistance and heat resistance are acquired. That is, according to the present invention, it is shown that a self-bonding insulated electric wire having a fusion coating excellent in mechanical strength such as wear resistance and heat resistance can be obtained.

Claims (8)

  A self-bonding insulated wire characterized by having a fusion film made of a resin composition containing a phenoxy resin obtained by copolymerizing bisphenol A, bisphenol S and an epoxy monomer containing a biphenyl type epoxy unit, and a crosslinking agent. .   The self-bonding insulated wire according to claim 1, wherein the phenoxy resin has a weight average molecular weight of 5000 or more.   The content of the bisphenol S contained in the resin composition is within a range of 0.2 to 0.5 in terms of molar ratio with respect to the total amount of bisphenol A and bisphenol S. The self-bonding insulated wire according to claim 2.   The self-bonding insulated wire according to any one of claims 1 to 3, wherein the copolymerization of the phenoxy resin is performed using an amine catalyst.   5. The self-bonding insulated electric wire according to claim 1, wherein a content of the crosslinking agent is 10 to 20% by weight with respect to the phenoxy resin.   A self-bonding insulated electric wire having a fused film made of a resin composition containing a bisphenol A type epoxy resin, a bisphenol S type epoxy resin, a biphenyl type epoxy resin, and a crosslinking agent.   The self-bonding insulated electric wire according to any one of claims 1 to 6, wherein the fusion-bonding film contains a lubricant.   A compressor driving motor using the self-bonding insulated wire according to any one of claims 1 to 7.