WO2024143446A1 - モータ用インシュレータ - Google Patents

モータ用インシュレータ Download PDF

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Publication number
WO2024143446A1
WO2024143446A1 PCT/JP2023/046865 JP2023046865W WO2024143446A1 WO 2024143446 A1 WO2024143446 A1 WO 2024143446A1 JP 2023046865 W JP2023046865 W JP 2023046865W WO 2024143446 A1 WO2024143446 A1 WO 2024143446A1
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Prior art keywords
methyl
butene
resin composition
motor
group
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PCT/JP2023/046865
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English (en)
French (fr)
Japanese (ja)
Inventor
翼 稲田
裕輔 村田
佑樹 松原
悠 佐藤
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Kuraray Co Ltd
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Kuraray Co Ltd
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Priority to JP2024567912A priority Critical patent/JPWO2024143446A1/ja
Publication of WO2024143446A1 publication Critical patent/WO2024143446A1/ja
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F10/00—Homopolymers and copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
    • C08F10/14—Monomers containing five or more carbon atoms
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/30—Windings characterised by the insulating material
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/32—Windings characterised by the shape, form or construction of the insulation
    • H02K3/34—Windings characterised by the shape, form or construction of the insulation between conductors or between conductor and core, e.g. slot insulation
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/46—Fastening of windings on the stator or rotor structure

Definitions

  • the present invention relates to an insulator for a motor.
  • Electric vehicles have become popular as an energy-efficient means of transportation.
  • Electric vehicles are equipped with a motor generator that selectively functions as an electric motor and a generator.
  • This motor generator is composed of a cylindrical rotor, a motor stator located on the outer periphery of the rotor, and a motor housing that houses the rotor and the motor stator.
  • a motor insulator made of a highly insulating resin is used as a component of the motor housing.
  • materials used for such motor insulators include syndiotactic polystyrene resin, polyphenylene sulfide, and polybutylene terephthalate.
  • Patent Document 1 describes a high-voltage part made of a polybutylene terephthalate resin composition having excellent tracking resistance.
  • motor insulators are required to have a low dielectric constant and a low dielectric loss tangent, while also being resistant to high voltages and to heat generated by coils incorporated in electric motors and generators, and by electronic devices, etc.
  • materials that have been used conventionally do not have both resistance to high voltages and resistance to heat generated by coils, electronic devices, and the like.
  • the objective of the present invention is to provide a motor insulator that has a low dielectric constant and low dielectric tangent, as well as excellent voltage resistance and heat resistance.
  • the present inventors have conceived the following invention and found that the problems can be solved. That is, the present invention is as follows.
  • a motor insulator comprising a resin composition containing a 3-methyl-1-butene polymer.
  • the 3-methyl-1-butene polymer is at least one selected from the group consisting of a 3-methyl-1-butene homopolymer and a copolymer of 3-methyl-1-butene with ethylene or an ⁇ -olefin, and the ⁇ -olefin is an ⁇ -olefin having 3 to 20 carbon atoms.
  • the present invention provides a motor insulator that has a low dielectric constant and a low dielectric tangent, as well as excellent voltage resistance and heat resistance.
  • FIG. 1A and 1B are diagrams showing the shape of a motor insulator according to the present invention.
  • the motor insulator of this embodiment may be made of a resin composition, or may contain components other than the resin composition.
  • the resin composition of the present embodiment contains a 3-methyl-1-butene polymer.
  • the 3-methyl-1-butene polymer is a polymer containing at least a structural unit derived from 3-methyl-1-butene.
  • the 3-methyl-1-butene polymer may be a 3-methyl-1-butene homopolymer, or may be a copolymer of 3-methyl-1-butene and an unsaturated hydrocarbon. Examples of the unsaturated hydrocarbon include ethylene and ⁇ -olefins.
  • the ⁇ -olefin used in the 3-methyl-1-butene polymer means an ⁇ -olefin other than 3-methyl-1-butene.
  • the 3-methyl-1-butene polymer is preferably at least one selected from the group consisting of a 3-methyl-1-butene homopolymer and a copolymer of 3-methyl-1-butene and ethylene or an ⁇ -olefin having 3 to 20 carbon atoms, and more preferably a copolymer of 3-methyl-1-butene and ethylene or an ⁇ -olefin having 3 to 20 carbon atoms.
  • the copolymer of 3-methyl-1-butene and ethylene or an ⁇ -olefin having 3 to 20 carbon atoms means, in other words, a copolymer of 3-methyl-1-butene and ethylene or a copolymer of 3-methyl-1-butene and an ⁇ -olefin having 3 to 20 carbon atoms.
  • the copolymer of 3-methyl-1-butene and ethylene or an ⁇ -olefin will also be referred to simply as "copolymer”.
  • the copolymer may be a random copolymer, a block copolymer, or an alternating copolymer.
  • the method for producing the copolymer is not limited as long as it does not impair the effects of the present invention, and a known copolymerization method can be adopted.
  • the content of structural units derived from ethylene or an ⁇ -olefin in 100 mol % of the copolymer is preferably more than 0 mol % and not more than 20 mol %. From the viewpoints of flexibility and impact resistance, the content of structural units derived from ethylene or an ⁇ -olefin in 100 mol % of the copolymer is more preferably 0.1 mol % or more, and further preferably 0.5 mol % or more.
  • the content of structural units derived from ethylene or an ⁇ -olefin in 100 mol % of the copolymer is more preferably 15 mol % or less, and even more preferably 10 mol % or less. From these viewpoints, the content of structural units derived from ethylene or ⁇ -olefin in 100 mol% of the copolymer is more preferably 0.1 to 15 mol%, and even more preferably 0.5 to 10 mol%. In one embodiment, the content of structural units derived from ethylene or ⁇ -olefin in 100 mol% of the copolymer is more preferably more than 0 mol% and 10 mol% or less.
  • the content of structural units derived from ethylene or ⁇ -olefin in the copolymer can be determined by a Fourier transform infrared spectrophotometer (FT-IR). Specifically, it can be measured by the method described in the Examples.
  • FT-IR Fourier transform infrared spectrophotometer
  • the content of structural units derived from 3-methyl-1-butene in 100 mol % of the copolymer is preferably 80 mol % or more and less than 100 mol %.
  • the content of structural units derived from 3-methyl-1-butene in 100 mol% of the copolymer is preferably more than 50 mol%, more preferably 70 mol% or more, even more preferably 80 mol% or more, more preferably 85 mol% or more, even more preferably 90 mol% or more, still more preferably 92 mol% or more, and even more preferably 93 mol% or more.
  • the content of structural units derived from 3-methyl-1-butene in 100 mol% of the copolymer is more preferably 99.9 mol% or less, even more preferably 99.5 mol% or less, and still more preferably 99.0 mol% or less.
  • the content of structural units derived from 3-methyl-1-butene in 100 mol% of the copolymer is more preferably 85 to 99.9 mol%, even more preferably 90 to 99.5 mol%, still more preferably 92 to 99.5 mol%, even more preferably 93 to 99.5 mol%, and still more preferably 93 to 99.0 mol%.
  • R 7 and R 8 each independently represent an alkyl group having 1 to 4 carbon atoms
  • R 9 and R 10 each independently represent an alkyl group having 1 to 9 carbon atoms.
  • the alkyl group having 1 to 4 carbon atoms include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, an isobutyl group, an s-butyl group, and a t-butyl group.
  • the alkyl group having 1 to 9 carbon atoms may be linear or branched.
  • the content of the alkyl radical scavenger in the resin composition relative to 100 parts by mass of the 3-methyl-1-butene polymer is more preferably 0.02 parts by mass or more, and further preferably 0.05 parts by mass or more.
  • the resin composition may contain additives other than the alkyl radical scavenger and the antioxidant.
  • additives include antacids, fillers, light stabilizers, antistatic agents, flame retardants, pigments, polymerization inhibitors, heavy metal deactivators, ultraviolet absorbers, nucleating agents, clarifying agents, lubricants, fluorescent brightening agents, rust inhibitors, and sliding agents.
  • the other additives may be used alone or in combination of two or more.
  • Inorganic fine particles include, for example, Group 1 element compounds such as lithium fluoride and borax (sodium borate hydrate); Group 2 element compounds such as magnesium carbonate, magnesium phosphate, magnesium oxide (magnesium oxide), magnesium chloride, magnesium acetate, magnesium fluoride, magnesium titanate, magnesium silicate, magnesium silicate hydrate (talc), calcium carbonate, calcium phosphate, calcium phosphite, calcium sulfate (gypsum), calcium acetate, calcium terephthalate, calcium hydroxide, calcium silicate, calcium fluoride, calcium titanate, strontium titanate, barium titanate, zinc titanate, lanthanum titanate, bismuth titanate, lead titanate, barium carbonate, barium phosphate, barium sulfate, barium phosphite; titanium dioxide (titanium A), titanium monoxide, titanium nitride, zirconium dioxide (zirconia), zirconium monoxide, and other group 4 element compounds; moly
  • the resin composition may or may not contain a resin other than the 3-methyl-1-butene polymer.
  • the resin composition may contain, as a resin other than the 3-methyl-1-butene polymer, other resins such as vinyl acetate-ethylene copolymers, modified polyolefins in which polyolefins are partially oxidized and/or modified with reactive functional groups such as maleic acid, etc., from the viewpoint of improving the dispersibility of additives containing polar groups.
  • polyolefins constituting modified polyolefins modified with reactive functional groups include polyethylene, polypropylene, and polyolefins having ⁇ -olefins having 3 to 20 carbon atoms as structural units.
  • the resin other than the 3-methyl-1-butene polymer is preferably at least one selected from the group consisting of polyethylene or polypropylene, more preferably at least one selected from the group consisting of modified polyethylene or modified polypropylene in which polyolefin is partially oxidized and/or modified with a reactive functional group such as maleic acid, and further preferably maleic anhydride-modified polypropylene.
  • the melting point of the resin composition of the present embodiment is preferably 260 to 310° C. When the melting point of the resin composition is within the above range, molding can be performed more easily, and reflow heat resistance can be further improved.
  • the melting point of the resin composition means a peak temperature measured by a method similar to the method for measuring the melting point of a 3-methyl-1-butene polymer, and specifically, the melting point can be measured by the method for measuring the melting point of a 3-methyl-1-butene polymer described in the Examples.
  • the dielectric constant of the motor insulator of this embodiment means the dielectric constant measured at a specific frequency, specifically, the dielectric constant measured at a frequency of 10 kHz to 200 GHz.
  • the dielectric constant at 10 kHz to 200 GHz is preferably 0.5 or more, more preferably 1.5 or more, and even more preferably 2.0 or more.
  • the dielectric constant is preferably 5.0 or less, more preferably 4.0 or less, and even more preferably 3.5 or less. That is, the dielectric constant at 10 kHz to 200 GHz is preferably 0.5 to 5.0, more preferably 1.5 to 4.0, and even more preferably 2.0 to 3.5.
  • the dielectric constant of the motor insulator at 10 kHz to 200 GHz means a value measured by a common method such as a capacitance method, a resonance method, or a frequency change method, and specifically, it can be measured by the method described in the examples.
  • a common method such as a capacitance method, a resonance method, or a frequency change method
  • the measurement frequency is 10 kHz to 1 GHz
  • the capacitance method when the measurement frequency is more than 1 GHz and not more than 50 GHz, it is preferable to perform the measurement by the resonance method
  • the measurement frequency is more than 50 GHz and not more than 200 GHz
  • the motor insulator of the present embodiment has a relative dielectric constant at 10 GHz measured by a resonance method of 0.5 to 5.0, preferably 1.5 to 4.0, and more preferably 2.0 to 3.5.
  • the comparative tracking index of the motor insulator of this embodiment is preferably 600 V or more, more preferably 700 V or more, and even more preferably 800 V or more, and the upper limit is preferably higher, but may be, for example, 4.5 kV or less, 3.5 kV or less, or 2.5 kV or less. That is, it may be 600 V to 4.5 kV, 700 V to 3.5 kV, or more preferably 800 V to 2.5 kV. If the comparative tracking index is 600 V or more, it is possible to suppress ignition that occurs when a high voltage is applied.
  • Methods for measuring tracking resistance include the Comparative Tracking Index (CTI) test based on IEC60112:2020, JIS C 2134:2007, ASTM D 3638 and UL 746A, and the Inclined-Plane Tracking (IPT) test based on IEC60587:2007, JIS C2136:2004 and ASTM D2303.
  • CTI Comparative Tracking Index
  • IPT Inclined-Plane Tracking
  • the upper limit of the CTI test voltage is specified as 600V
  • the lower limit of the IPT test voltage is specified as 1kV (1000V). That is, there is no clear provision for measuring the comparative tracking index in the range of test voltages greater than 600V and less than 1000V.
  • the comparative tracking index in this specification means a value of the comparative tracking index test (CTI) measured in accordance with JIS C 2134:2007 with the upper limit of the test voltage being 900 V. Specifically, it can be measured by the method described in the examples.
  • CTI comparative tracking index test
  • the deflection temperature under load of the motor insulator of this embodiment is preferably 250° C. or higher, more preferably 255° C. or higher, and even more preferably 260° C. or higher from the viewpoint of heat resistance, and is preferably 310° C. or lower, more preferably 300° C. or lower, and even more preferably 290° C. or lower from the viewpoint of processability. That is, it is preferably 250 to 310° C., more preferably 255 to 300° C., and even more preferably 260 to 290° C.
  • the deflection temperature under load is 250° C. or higher, the resistance to heat generated from coils, electronic devices, etc.
  • the deflection temperature under load of the motor insulator means a value measured in accordance with Method A of JIS K 7191-2:2015, and specifically, can be measured by the method described in the examples.
  • the water absorption rate of the motor insulator of this embodiment is preferably 0.5 mass % or less, more preferably 0.3 mass % or less, and further preferably 0.1 mass % or less. If the water absorption rate of the motor insulator is within the above range, the deterioration of performance in a hot environment can be further suppressed. In addition, storage management until use as a motor insulator is also easy.
  • the water absorption rate of the motor insulator means a value measured in accordance with JIS K 7209:2000 Method A, and specifically, it can be measured by the method described in the examples.
  • the method for manufacturing the motor insulator of this embodiment is not particularly limited as long as it is a method for manufacturing the motor insulator described above.
  • the method for producing an insulator for a motor preferably includes a step of obtaining a 3-methyl-1-butene polymer, and a step of molding a resin composition to obtain the insulator for a motor.
  • a resin composition is obtained by blending other components such as additives in addition to the 3-methyl-1-butene polymer, it is preferable to go through a step of obtaining a resin composition described later.
  • the method for producing an insulator for a motor includes a step of obtaining a 3-methyl-1-butene polymer, a step of obtaining a resin composition, and a step of obtaining an insulator for a motor by molding the resin composition.
  • the step of obtaining a 3-methyl-1-butene polymer is not particularly limited as long as it is a step that can obtain a 3-methyl-1-butene polymer.
  • the method of obtaining a 3-methyl-1-butene polymer is not particularly limited, and the polymer can be produced using a known catalyst such as a Ziegler-Natta catalyst or a metallocene catalyst.
  • the step of obtaining a 3-methyl-1-butene polymer is a step of preparing a raw material containing 3-methyl-1-butene and polymerizing the raw material to obtain a 3-methyl-1-butene polymer.
  • the method of obtaining a 3-methyl-1-butene polymer can be, for example, as described in JP-A-61-103910, by homopolymerizing 3-methyl-1-butene in the presence of a catalyst, or copolymerizing 3-methyl-1-butene with the above-mentioned ethylene or ⁇ -olefin to obtain a powder.
  • the raw material contains at least 3-methyl-1-butene and may further contain a catalyst.
  • the raw material contains at least 3-methyl-1-butene and ethylene or the above-mentioned ⁇ -olefin, and may further contain a catalyst.
  • the stereoregularity of the 3-methyl-1-butene polymer may be isotactic or syndiotactic.
  • the step of obtaining a resin composition is a step of blending and mixing other components such as additives in addition to the 3-methyl-1-butene polymer to obtain a resin composition. Specifically, it is a step of obtaining a resin composition containing a 3-methyl-1-butene polymer and other components. The 3-methyl-1-butene polymer and other components are mixed to obtain a resin composition.
  • the mixing method is not particularly limited, and a method of melt-kneading using a twin-screw kneading extruder or the like can be used. Furthermore, each raw material may be dry-blended before melt-kneading.
  • the resin composition consists of the 3-methyl-1-butene polymer, and there is no need to go through a step of obtaining a resin composition.
  • the additives include those similar to those described in the above [Resin composition], such as alkyl radical scavengers, antioxidants, antacids, fillers, light stabilizers, antistatic agents, flame retardants, pigments, polymerization inhibitors, heavy metal deactivators, ultraviolet absorbers, nucleating agents, clarifying agents, lubricants, fluorescent brightening agents, rust inhibitors, and sliding agents.
  • the method of injecting an inert gas into the melt kneader to melt and knead may be, for example, to inject each component into the melt kneader while injecting an inert gas into the melt kneader to perform melt kneading, or to inject an inert gas into the melt kneader after injecting each component into the melt kneader to perform melt kneading.
  • the inert gas may be continuously injected into the melt kneader during melt kneading. The method of injecting the inert gas can be carried out depending on the equipment provided in each melt kneader.
  • the inert gas may be injected from a gas supply section such as an inert gas provided in the melt kneader, from a supply section for each component provided in the melt kneader, or from a gas vent vent provided in the melt kneader.
  • a gas supply section such as an inert gas provided in the melt kneader
  • the inert gas can be injected into the entire area from the inert gas supply section to the heating section where melting and kneading are performed, and melting and kneading can be performed.
  • the inert gas include nitrogen gas, helium gas, neon gas, argon gas, krypton gas, and carbon dioxide gas. From the viewpoints of availability and versatility, nitrogen gas is preferred.
  • the melt-kneading time can be adjusted depending on the size of the kneading device, etc. For example, it may be 1 to 15 minutes, but is not limited to this numerical range of melt-kneading time.
  • the "melt-kneading time” refers to the time the mixer is rotating in a batch kneader, and the residence time of the raw materials in the device in the case of a continuous extrusion kneader.
  • the shape of the motor insulator of this embodiment is selected according to the purpose and performance.
  • Examples of the shape of the motor insulator include the coil bobbin described in JP 2017-163755 A, the stator core described in JP 2020-088899 A, and the motor insulating member described in JP 2021-129408 A.
  • a calibration curve was prepared from the ratio of the peak area of 1,461 cm -1 bending vibration derived from the main chain methylene group of the 3-methyl-1-butene homopolymer to the peak area of 727 cm -1 bending vibration derived from the side chain methylene group of the ⁇ -olefin homopolymer, and the addition ratio of each polymer.
  • the IR measurement was carried out on the 3-methyl-1-butene copolymer obtained in the Production Example, and the obtained measured value (peak area ratio) was inserted into the calibration curve to determine the content ratio of the structural unit derived from the ⁇ -olefin other than 3-methyl-1-butene (1-decene).
  • the test pieces were fixed between a high-voltage side electrode (cylinder with a diameter of 25 mm) and a low-voltage side electrode (cylinder with a diameter of 25 mm), and an AC voltage of 50 Hz was increased at 150°C at a voltage increase rate of 3 kV/s to measure the dielectric breakdown strength.
  • the obtained dielectric breakdown strength value was evaluated according to the following criteria. In addition, if the dielectric breakdown strength is 50 kV/mm or more, the withstand voltage is good.
  • B Dielectric breakdown strength is less than 50 kV/mm.
  • C Conductive.
  • test pieces in accordance with JIS C 2134:2007, a TRACKING RESISTANCE TESTER (manufactured by Nikka Techno Service Co., Ltd.) was used, and measurement solution A (analytical reagent grade anhydrous ammonium chloride (NH 4 Cl) with a purity of 99.8% or more was dissolved in deionized water at a mass fraction of about 0.1%, and the resistivity at 23°C ⁇ 1°C was prepared to be 3.95 ⁇ m ⁇ 0.05 ⁇ m) was used, and the voltage was changed from 400 to 900 V, and the maximum voltage at which no dielectric breakdown occurred (comparative tracking index) was measured. From the obtained comparative tracking index, the tracking resistance was evaluated according to the following criteria.
  • measurement solution A analytical reagent grade anhydrous ammonium chloride (NH 4 Cl) with a purity of 99.8% or more was dissolved in deionized water at a mass fraction of about 0.1%, and the resistivity at 23°C ⁇ 1°
  • the tracking resistance is good.
  • the composition of the obtained titanium catalyst component was 4.0 mass % titanium, 56.0 mass % chlorine, 17.0 mass % magnesium, 10.4 mass % ethyl benzoate, and 12.6 mass % of the hydrocarbon solvent consisting of decane and hexane.
  • copolymer (A) which is a copolymer of 3-methyl-1-butene and 1-decene.
  • the copolymer (A) thus obtained was subjected to the above-mentioned measurements, and found to have a melting point of 286° C. and a melt viscosity of 104 Pa ⁇ s.
  • the content of structural units derived from the comonomer 1-decene in the copolymer (A) was 1.1 mol %.
  • Example 1 A mixture of 100 parts by mass of the copolymer (A) obtained in Production Example 1, 0.2 parts by mass of pentaerythritol tetrakis[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate] ("AO-60", manufactured by ADEKA Corporation) as a phenol-based antioxidant, 3,9-bis(2,6-di-t-butyl-4-methylphenoxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane as a phosphorus-based antioxidant, and 0.2 parts by mass of can ("PEP-36", manufactured by ADEKA Corporation), 0.1 parts by mass of 2,4-di-t-amyl-6-[1-(3,5-di-t-amyl-2-hydroxyphenyl)ethyl]phenyl acrylate ("Sumilizer (registered trademark) GS”, manufactured by Sumitomo Chemical Co., Ltd.
  • the obtained resin composition (M1) was melt-kneaded using a Sumitomo electric injection molding machine "SE18DU” (manufactured by SUMITOMO Heavy Industries, Ltd.) under nitrogen atmosphere at 40 rpm and a cylinder temperature of 310°C, and then injection molded under conditions of an injection pressure of 45 MPa, a mold retention time of 33 seconds, and a mold temperature of 160°C to obtain a motor insulator (P1) having the shape shown in Figure 1.
  • SE18DU Sumitomo electric injection molding machine
  • Example 2 A resin composition (M2) and a motor insulator (P2) were prepared in the same manner as in Example 1, except that the copolymer (B) obtained in Production Example 2 was used instead of the copolymer (A) in Example 1.
  • Example 2 the results of evaluation according to the above-mentioned evaluation method are shown in Table 1.
  • Example 3 A resin composition (M3) and a motor insulator (P3) were prepared in the same manner as in Example 1, except that the homopolymer (C) obtained in Production Example 3 was used instead of the copolymer (A) in Example 1. In Example 3, the results of evaluation according to the above-mentioned evaluation method are shown in Table 1.
  • a motor insulator (Q1) was obtained in the same manner as in Example 1, except that in Example 1, syndiotactic polystyrene "XAREC (registered trademark) C132" (manufactured by Idemitsu Kosan Co., Ltd.) was used instead of the resin composition (M1), and the cylinder temperature during melt kneading and injection molding was changed to 280° C. and the mold temperature was changed to 80° C.
  • the evaluation results of the obtained motor insulator (Q1) are shown in Table 1.
  • a motor insulator (Q2) was obtained in the same manner as in Example 1, except that polymethylpentene "T730" (manufactured by Mitsui Fine Chemicals, Inc.) was used instead of the resin composition (M1) in Example 1, and the cylinder temperature during melt kneading and injection molding was changed to 260°C and the mold temperature was changed to 70°C.
  • the evaluation results of the obtained motor insulator (Q2) are shown in Table 1.
  • a motor insulator (Q3) was obtained in the same manner as in Example 1, except that polyphenylene sulfide "FZ-1130-D5" (manufactured by DIC Corporation) was used instead of the resin composition (M1) in Example 1, and the cylinder temperature during melt kneading and injection molding was changed to 320°C, and the mold temperature was changed to 140°C.
  • the evaluation results of the obtained motor insulator (Q3) are shown in Table 1.
  • a motor insulator (Q4) was obtained in the same manner as in Example 1, except that polybutylene terephthalate "DURANEX (registered trademark) PBT 3300" (manufactured by Polyplastics Co., Ltd.) was used instead of the resin composition (M1) in Example 1, and the cylinder temperature during melt kneading and injection molding was changed to 260° C. and the mold temperature was changed to 80° C.
  • the evaluation results of the obtained motor insulator (Q4) are shown in Table 1.
  • the motor insulator containing the resin composition containing the 3-methyl-1-butene polymer of the present invention has a low relative dielectric constant and a low dielectric loss tangent, and is excellent in voltage resistance and heat resistance. In particular, since it has excellent heat resistance, it can be made thin and can be made compact. Therefore, it is suitable for motor insulators.

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  • Chemical & Material Sciences (AREA)
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PCT/JP2023/046865 2022-12-28 2023-12-27 モータ用インシュレータ Ceased WO2024143446A1 (ja)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2025191965A1 (ja) * 2024-03-14 2025-09-18 サンデン株式会社 電動圧縮機用モータ及びそれを備えた電動圧縮機

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