JP2007182990A - Resin composition for torque limiter part and torque limiter part composed of its composition - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resin composition for a torque limiter part and the torque limiter part composed of its composition, superior in heat conductivity, dimensional stability, circularity and a cold heat cycle characteristic, and superior in magnetic stability in an actual service condition. <P>SOLUTION: This resin composition for the torque limiter part includes (A) a thermoplastic resin of 5 to 50 wt.% and (B) a filler of 95 to 50 wt.% with the total quantity of the thermoplastic resin and the filler as 100 wt.%, and is characterized by setting the heat conductivity measured by a laser flash method to 1 W/mK or more. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a resin composition for torque limiter parts having excellent thermal conductivity, dimensional stability, roundness, and thermal cycle characteristics, and excellent magnetic stability under actual use conditions, and a torque limiter part obtained therefrom. It is.

  There have been many attempts to develop applications in fields where resinization has been difficult so far, and the required performance for resins tends to become more diversified and stricter. In recent years, particularly noticeable has been a trend toward promoting resinization for reducing costs by reducing weight and improving productivity in OA applications where sheet metal, aluminum die-casting, and ceramics have been used. For example, torque limiter parts are used in the paper feeding, feeding, and discharging portions of office automation equipment such as printers and copiers, and are roughly classified into two types: spring type and magnetic type. In recent years, with the increase in speed of copying machines, there is a demand for higher speed and longer life of torque limiter parts. For example, a resin composition in which glass fiber is filled in polybutylene terephthalate is used as the case member that constitutes the torque limiter component. However, if heat is generated from the magnet due to hysteresis torque, general thermoplasticity will occur. Since the resin has low thermal conductivity, there is a problem that heat is trapped inside the case and the magnetic force is reduced, and heat generation is further increased by increasing the speed, resulting in a decrease in magnetic stability. Also, depending on the usage environment, it may be used in a low-temperature environment, and heat generation from the magnet due to hysteresis torque may cause a rapid temperature rise, and the case may be damaged due to dimensional changes due to temperature differences from the surroundings. Especially, the weld part (resin meeting part) of the case is easy to break, so there is a problem of durability after the thermal cycle treatment. Several methods have been proposed for improving the above.

  For example, a method of using a double structure in which an aluminum-based metal material is used for an inner case member in contact with a magnet and a thermoplastic resin is used for an outer case member (see Patent Document 1), an olefin rubber or the like is used for the case member. A method of improving the adhesiveness between the magnet and the case member using an amorphous resin (see Patent Document 2), and a method of adding an elastic member such as rubber around the magnet and applying torque due to the elastic force (Patent Document 3). Have been proposed).

However, although the above-mentioned patent document 1 can certainly take heat of the magnet by using a metal on the inner side, interface peeling or cracking occurs due to a difference in linear expansion coefficient with the outer resin, and the composite part Therefore, productivity is not sufficient. Further, in Patent Document 2 or 3, although the adhesion between the magnet and the case is improved, the thermal conductivity is not sufficient, so that the torque tends to decrease and is not satisfactory in practice.
Japanese Patent Application Laid-Open No. 06-221341 (first and second items, examples) Japanese Patent Laid-Open No. 2001-178109 (first and second items, examples) Japanese Patent Application Laid-Open No. 2004-156639 (first and second items, examples)

  The present invention eliminates the above-mentioned conventional problems, and retains the product design freedom and productivity that are the characteristics of thermoplastic resins, while being excellent in thermal conductivity, dimensional stability, roundness, and thermal cycle characteristics. An object of the present invention is to provide a resin composition for torque limiter parts which is excellent in magnetic stability under actual use conditions and a torque limiter part obtained therefrom.

  As a result of intensive studies to solve the above problems, the present inventors have reached the present invention.

That is, the present invention
(1) The total amount of the thermoplastic resin and filler is 100% by weight, (A) 5 to 50% by weight of thermoplastic resin and (B) 95 to 50% by weight of filler, and heat measured by a laser flash method A resin composition for torque limiter parts, wherein the conductivity is 1 W / mK or more,
(2) (B) The resin composition for a torque limiter component according to (1), wherein at least part or all of the filler is a heat conductive filler having a thermal conductivity of 20 W / mK or more,
(3) The resin for torque limiter parts according to (1) or (2), wherein (B) filler is a combination of a fibrous filler and a non-fibrous filler in a blending ratio of 4/6 to 1/9 (weight ratio). Composition,
(4) The resin composition for torque limiter parts according to (1) to (3), wherein (A) the thermoplastic resin is at least one selected from polyamide, non-liquid crystalline polyester, liquid crystal polymer, and polyarylene sulfide.
(5) The resin for torque limiter parts as described in any one of (1) to (4), wherein the linear expansion coefficient measured in accordance with ASTM D-696 is 2 × 10 ⁻⁵ 1 / ° C. or less. (6) A torque limiter component comprising a resin composition for a torque limiter component according to any one of (1) to (5), wherein the component is magnetic. is there.

  The resin composition for torque limiter parts of the present invention is excellent in balance of thermal conductivity, dimensional stability, roundness and thermal cycle characteristics not obtained with conventional materials, and magnetic stability under actual use conditions. Therefore, the obtained torque limiter component can be used extremely practically.

  Hereinafter, the present invention will be described in detail. In the present invention, “weight” means “mass”.

  In the present invention, the thermoplastic resin (A) is a synthetic resin that can be melt-molded.

  Specific examples thereof include, for example, non-liquid crystalline polyesters such as non-liquid crystalline semi-aromatic polyesters and non-liquid crystalline wholly aromatic polyesters, liquid crystal polymers (liquid crystalline polyesters, liquid crystalline polyester amides, etc.), polycarbonates, aliphatic polyamides, Polyamide such as aliphatic-aromatic polyamide, wholly aromatic polyamide, polyoxymethylene, polyimide, polyamide, polybenzimidazole, polyketone, polyetheretherketone, polyetherketone, polyethersulfone, polyetherimide, modified polyphenylene ether, Olefin polymers such as polysulfone, phenoxy, polyarylene sulfide, polypropylene, polyethylene, ethylene / propylene copolymer, ethylene / 1-butene copolymer, ethylene / propylene / non Such as diene copolymer, ethylene / ethyl acrylate copolymer, ethylene / glycidyl methacrylate copolymer, ethylene / vinyl acetate / glycidyl methacrylate copolymer and ethylene / propylene-g-maleic anhydride copolymer Examples thereof include one or a mixture of two or more selected from olefin copolymers, styrene copolymers such as ABS, AS, and polystyrene, methacrylic resins, polyester ether elastomers, polyester elastomers, polyamide elastomers, and the like (" / "Represents copolymerization. The same shall apply hereinafter).

  Among the above-mentioned thermoplastic resins, non-liquid crystalline polyester, polyamide, liquid crystalline polymer such as liquid crystalline polyester, polycarbonate, polyarylene sulfide, polyethylene, polypropylene, polystyrene, ABS, modified polyphenylene ether, One or a mixture of two or more selected from phenoxy is preferably used. Among them, liquid crystal polymers such as polyamide, non-liquid crystalline polyester, and liquid crystalline polyester, and polyarylene sulfide are preferably used. Especially, liquid crystal polymer and polyarylene sulfide are used. Preferably used.

  Furthermore, specific examples of the non-liquid crystalline polyester include polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, polyethylene-2,6-naphthalate, polybutylene naphthalate, poly1,4-cyclohexanedimethylene terephthalate and polyethylene-1,2-. In addition to bis (phenoxy) ethane-4,4′-dicarboxylate, polyethylene isophthalate / terephthalate, polybutylene terephthalate / isophthalate, polybutylene terephthalate / decane dicarboxylate, and polycyclohexanedimethylene terephthalate / isophthalate Copolyester etc. are mentioned. Of the above, polybutylene terephthalate, polybutylene naphthalate, poly 1,4-cyclohexanedimethylene terephthalate, polyethylene-2,6-naphthalate, polyethylene terephthalate, and the like can be preferably used in terms of mechanical properties, moldability, and the like. Of these, polybutylene terephthalate is preferable.

  Specific examples of polyamides include, for example, ring-opening polymerization products of cyclic lactams, polycondensates of aminocarboxylic acids, polycondensates of dicarboxylic acids and diamines, and specific examples include nylon 6, nylon 4, 6, Nylon 6,6, Nylon 6,10, Nylon 6,12, Nylon 11, Nylon 12, and other aliphatic polyamides, poly (metaxylene adipamide), poly (hexamethylene terephthalamide), poly (hexamethylene isophthalate) Amide), polynonanemethylene terephthalamide, poly (tetramethylene isophthalamide), poly (methylpentamethylene terephthalamide) and other aliphatic-aromatic polyamides, and copolymers thereof. Examples of the copolymer include nylon. 6 / Poly (hexamethylene terephthalamide), nylon 6, / Poly (hexamethylene terephthalamide), nylon 6 / nylon 6/6 / poly (hexamethylene isophthalamide), poly (hexamethylene isophthalamide) / poly (hexamethylene terephthalamide), nylon 6 / poly (hexamethylene isophthalamide) ) / Poly (hexamethylene terephthalamide), nylon 12 / poly (hexamethylene terephthalamide), poly (methylpentamethylene terephthalamide) / poly (hexamethylene terephthalamide), and the like. The form of copolymerization may be either random or block, but is preferably random. Among the above-mentioned polyamide resins, nylon 6, nylon 6,6, nylon 12, nylon 4,6, polynonanemethylene terephthalamide, nylon 6 / poly (hexamethylene terephthalamide), nylon in terms of mechanical properties and moldability 6.6 / poly (hexamethylene terephthalamide), nylon 6 / nylon 6.6 / poly (hexamethylene isophthalamide), poly (hexamethylene isophthalamide) / poly (hexamethylene terephthalamide), nylon 6 / poly (hexa) Methylene isophthalamide) / poly (hexamethylene terephthalamide), nylon 12 / poly (hexamethylene terephthalamide), nylon 6 / nylon 6/6 / poly (hexamethylene isophthalamide), poly (methylpentamethylene terephthalamide) It can be used preferably polyamides such as poly (hexamethylene terephthalamide), among others nylon 6 is preferred.

  The liquid crystal polymer is a resin capable of forming an anisotropic molten phase, and preferably has an ester bond. For example, a liquid crystalline polyester resin comprising a structural unit selected from an aromatic oxycarbonyl unit, an aromatic dioxy unit, an aromatic and / or aliphatic dicarbonyl unit, an alkylenedioxy unit, etc., and forming an anisotropic melt phase Or, a liquid crystalline polyester amide that is composed of a structural unit selected from the above structural unit and an aromatic iminocarbonyl unit, an aromatic diimino unit, an aromatic iminooxy unit, and the like, and that forms an anisotropic melt phase, etc. Specifically, a liquid crystalline polyester comprising a structural unit produced from p-hydroxybenzoic acid and 6-hydroxy-2-naphthoic acid, a structural unit produced from p-hydroxybenzoic acid, and 6-hydroxy-2-naphthoic acid. Generated structural units, aromatic dihydroxy compounds and / or aliphatic dicarboxylic Liquid crystalline polyester composed of structural units formed from, structural units formed from p-hydroxybenzoic acid, structural units formed from 4,4′-dihydroxybiphenyl, aromatic dicarboxylic acids such as terephthalic acid and isophthalic acid, and / or adipine Liquid crystalline polyester comprising a structural unit produced from an aliphatic dicarboxylic acid such as acid or sebacic acid, a structural unit produced from p-hydroxybenzoic acid, a structural unit produced from ethylene glycol, or a structural unit produced from terephthalic acid Polyester, structural unit generated from p-hydroxybenzoic acid, structural unit generated from ethylene glycol, liquid crystalline polyester composed of structural units generated from terephthalic acid and isophthalic acid, structural unit generated from p-hydroxybenzoic acid, ethylene Glico A liquid crystalline polyester composed of a structural unit generated from benzene, a structural unit generated from 4,4′-dihydroxybiphenyl, a structural unit generated from an aliphatic dicarboxylic such as terephthalic acid and / or adipic acid, sebacic acid, p-hydroxybenzoic acid From structural units generated from acids, structural units generated from ethylene glycol, structural units generated from aromatic dihydroxy compounds, and structural units generated from aromatic dicarboxylic acids such as terephthalic acid, isophthalic acid, and 2,6-naphthalenedicarboxylic acid In addition to structural units selected from aromatic oxycarbonyl units, aromatic dioxy units, aromatic and / or aliphatic dicarbonyl units, alkylenedioxy units, etc. P-aminopheno It is a polyester amide that forms an anisotropic melt phase containing p-iminophenoxy units formed from styrene.

  Further, representative examples of polyarylene sulfides include polyphenylene sulfide (hereinafter sometimes abbreviated as PPS), polyphenylene sulfide sulfone, polyphenylene sulfide ketone, random copolymers thereof, block copolymers, and mixtures thereof. Of these, polyphenylene sulfide is particularly preferably used. Such polyphenylene sulfide is a polymer preferably containing 70 mol% or more, more preferably 90 mol% or more of the repeating unit represented by the following general formula (I). When the repeating unit is 70 mol% or more, It is preferable at the point which is excellent in heat resistance.

  In addition, the polyphenylene sulfide resin can be composed of 30 mol% or less of the repeating unit with a repeating unit having the following structural formula, and may be a random copolymer or a block copolymer. Or a mixture thereof.

  Such polyarylene sulfide can be obtained by a generally known method, that is, a method for obtaining a polymer having a relatively small molecular weight described in JP-B-45-3368, or JP-B-52-12240 and JP-A-61-7332. Can be produced by, for example, a method for obtaining a polymer having a relatively large molecular weight.

  In the present invention, the polyarylene sulfide obtained as described above is subjected to crosslinking / high molecular weight by heating in air, heat treatment under an inert gas atmosphere such as nitrogen or reduced pressure, organic solvent, hot water, acid. Of course, it is also possible to use after performing various treatments such as washing with an aqueous solution, activation with a functional group-containing compound such as an acid anhydride, amine, isocyanate, or a functional group-containing disulfide compound.

  Specific methods for crosslinking / high molecular weight polyarylene sulfide resin by heating include an atmosphere of an oxidizing gas such as air or oxygen, or a mixed gas atmosphere of the oxidizing gas and an inert gas such as nitrogen or argon. Below, a method of heating until a desired melt viscosity is obtained at a predetermined temperature in a heating container can be exemplified. In this case, the heat treatment temperature is preferably 150 to 280 ° C., more preferably 200 to 270 ° C., and the treatment time is preferably 0.5 to 100 hours, more preferably 2 A range of ˜50 hours is selected, but by controlling both, a target viscosity level can be obtained. Such a heat treatment apparatus may be a normal hot air dryer or a heating apparatus with a rotary or stirring blade. However, in the case of efficient and more uniform treatment, a heating apparatus with a rotary or stirring blade is used. Is more preferable.

As a specific method for heat-treating the polyarylene sulfide resin under an inert gas atmosphere such as nitrogen or under reduced pressure, an inert gas atmosphere such as nitrogen or under reduced pressure (preferably 7,000 Nm ^-2 or less), Examples of the heat treatment method include a heat treatment temperature of 150 to 280 ° C, preferably 200 to 270 ° C, and a heating time of 0.5 to 100 hours, preferably 2 to 50 hours. Such a heat treatment apparatus may be a normal hot air dryer or a heating apparatus with a rotary or stirring blade. However, in the case of efficient and more uniform treatment, a heating apparatus with a rotary or stirring blade is used. Is more preferable.

  When the polyarylene sulfide is washed with an organic solvent, the organic solvent used for washing is not particularly limited as long as it does not have an action of decomposing the polyarylene sulfide resin. For example, nitrogen-containing polar solvents such as N-methylpyrrolidone, dimethylformamide, dimethylacetamide, sulfoxide sulfone solvents such as dimethyl sulfoxide, dimethylsulfone, ketone solvents such as acetone, methyl ethyl ketone, diethyl ketone, acetophenone, dimethyl ether, dipropyl ether , Ether solvents such as tetrahydrofuran, halogen solvents such as chloroform, methylene chloride, trichloroethylene, ethylene chloride, dichloroethane, tetrachloroethane, chlorobenzene, methanol, ethanol, propanol, butanol, pentanol, ethylene glycol, propylene glycol, phenol, Alcohol / phenolic solvents such as cresol and polyethylene glycol, benzene and toluene Ene, and aromatic hydrocarbon solvents such as xylene may be used. Of these organic solvents, N-methylpyrrolidone, acetone, dimethylformamide, chloroform and the like are particularly preferably used. These organic solvents are used alone or in combination of two or more.

  As a specific method of washing with such an organic solvent, there is a method of immersing polyarylene sulfide in an organic solvent, and if necessary, stirring or heating can be appropriately performed. There is no restriction | limiting in particular about the washing | cleaning temperature at the time of wash | cleaning polyarylene sulfide with an organic solvent, Arbitrary temperature of about normal temperature-about 300 degreeC can be selected. Although the cleaning efficiency tends to increase as the cleaning temperature increases, a sufficient effect is usually obtained at a cleaning temperature of room temperature to 150 ° C. The polyarylene sulfide that has been washed with an organic solvent is preferably washed several times with water or warm water in order to remove the remaining organic solvent. The water washing temperature is preferably 50 to 90 ° C, and preferably 60 to 80 ° C.

  The following method can be illustrated as a specific method when the polyarylene sulfide is treated with hot water. That is, it is preferable that the water used is distilled water or deionized water in order to exhibit the effect of preferable chemical modification of polyarylene sulfide by hot water washing. The operation of the hot water treatment is usually performed by adding a predetermined amount of polyarylene sulfide to a predetermined amount of water, and heating and stirring at normal pressure or in a pressure vessel. The ratio of polyarylene sulfide to water should be large, and is preferably used at a bath ratio of 200 g or less per 1 liter of water.

  The following method can be illustrated as a specific method in the case of acid-treating polyarylene sulfide. That is, there is a method of immersing polyarylene sulfide in an acid or an aqueous solution of an acid, and stirring or heating can be appropriately performed as necessary. The acid to be used is not particularly limited as long as it does not have an action of decomposing polyarylene sulfide. For example, aliphatic saturated monocarboxylic acids such as formic acid, acetic acid, propionic acid and butyric acid, and halo such as chloroacetic acid and dichloroacetic acid. Substituted aliphatic saturated carboxylic acids, aliphatic unsaturated monocarboxylic acids such as acrylic acid and crotonic acid, aromatic carboxylic acids such as benzoic acid and salicylic acid, dicarboxylic acids such as oxalic acid, malonic acid, succinic acid, phthalic acid and fumaric acid Acids and inorganic acidic compounds such as sulfuric acid, phosphoric acid, hydrochloric acid, carbonic acid and silicic acid are used. Of these acids, acetic acid and hydrochloric acid are particularly preferably used. The polyarylene sulfide subjected to the acid treatment is preferably washed several times with water in order to remove the remaining acid or salt. The water washing temperature is preferably 50 to 90 ° C, and preferably 60 to 80 ° C. The water used for washing is preferably distilled water or deionized water in the sense that it does not impair the preferable chemical modification effect of polyarylene sulfide by acid treatment.

  The weight average molecular weight of the polyarylene sulfide used in the present invention is preferably 50000 or less, more preferably 40000 or less, and more preferably 25000 or less in terms of polystyrene in order to enable high filler filling. Is particularly preferred. Although there is no restriction | limiting in particular about the minimum of a weight average molecular weight, When considering residence stability etc., it is preferable that it is 1500 or more.

  Here, the weight average molecular weight is a value measured by GPC and determined in terms of polystyrene. Two or more polyarylene sulfides having different melt viscosities may be used in combination.

  As the (B) filler used in the present invention, a filler capable of providing a composition having a thermal conductivity defined in the present invention is selected. Examples of the filler shape include fibrous or non-fibrous (plate-like, scale-like, granular, indeterminate shape, crushed product, etc.) fillers. Specifically, for example, the fibrous filler is glass fiber, PAN, or pitch. Carbon fiber, stainless steel fiber, metal fiber such as aluminum fiber and brass fiber, organic fiber such as aromatic polyamide fiber, gypsum fiber, ceramic fiber, asbestos fiber, zirconia fiber, alumina fiber, silica fiber, titanium oxide fiber, carbonized Examples include silicon fiber, rock wool, potassium titanate whisker, barium titanate whisker, aluminum borate whisker, silicon nitride whisker, and the type of glass fiber or carbon fiber is not particularly limited as long as it is generally used for resin reinforcement. For example, long fiber type or short fiber type chopped dos Land, can be used to select from such as milled fiber. The filler may be coated or focused with a thermoplastic resin such as an ethylene / vinyl acetate copolymer or a thermosetting resin such as an epoxy resin.

  Moreover, iron, copper, stainless steel, aluminum, brass, etc. can be illustrated as a specific example of the metal seed | species of the said metal fiber.

  Non-fibrous fillers such as mica, talc, kaolin, silica, calcium carbonate, glass beads, glass flakes, glass microballoons, clay, molybdenum disulfide, wollastonite, calcium polyphosphate, graphite, metal powder, metal flakes, metal ribbon, metal Examples thereof include oxides (alumina, zinc oxide, titanium oxide, etc.), carbon powder, graphite, carbon flakes, scaly carbon, carbon nanotubes, and the like. Moreover, silver, nickel, copper, zinc, aluminum, stainless steel, iron, brass, chromium, tin etc. can be illustrated as a specific example of the metal seed | species of metal powder, metal flakes, and a metal ribbon.

Here, specific examples of metal species of the metal powder, metal flake and metal ribbon include specific examples of metal oxides such as silver, nickel, copper, zinc, aluminum, magnesium, stainless steel, iron, brass, chromium and tin. Specific examples of nitrides such as SnO ₂ (antimony dope), In ₂ O ₃ (antimony dope) and ZnO (aluminum dope) include AlN (aluminum nitride), BN (boron nitride), Si ₃ N ₄ Examples thereof include (silicon nitride).

  In the present invention, the non-fibrous filler is made of an isocyanate compound, an organic silane compound, an organic titanate compound in order to achieve high efficiency such as high thermal conductivity and roundness by improving the affinity with the thermoplastic resin. And surface treatment with a coupling agent such as an organic borane compound and an epoxy compound. Among them, an alkoxysilane compound having at least one functional group selected from an epoxy group, an amino group, and an isocyanate group. A surface treatment is preferred. Specific examples include epoxy group-containing alkoxysilane compounds such as γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropyltriethoxysilane, 6- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, γ -Isocyanatopropyltriethoxysilane, γ-isocyanatopropyltrimethoxysilane, γ-isocyanatopropylmethyldimethoxysilane, γ-isocyanatopropylmethyldiethoxysilane, γ-isocyanatopropylethyldimethoxysilane, γ-isocyanatopropylethyldiethoxysilane, γ -Isocyanate group-containing alkoxysilane compounds such as isocyanatepropyltrichlorosilane, γ- (2-aminoethyl) aminopropylmethyldimethoxysilane, γ- (2-amino) Examples include amino group-containing alkoxysilane compounds such as ethyl) aminopropyltrimethoxysilane and γ-aminopropyltrimethoxysilane.

  The amount of addition of the organosilane compound as a surface treatment agent for non-fibrous filler is 2 to 100 parts by weight of filler from the viewpoint of high expression of characteristics such as thermal conductivity and roundness and handling properties. 3 parts by weight is preferable, and 0.1 to 1 part by weight is more preferable.

  Among them, in order to obtain a resin composition for torque limiter parts having the thermal conductivity defined in the present invention, a thermal conductive filler having a thermal conductivity of 20 W / mK or more is used as at least part or all of the component (B). It is preferable to use as.

  In order to set the thermal conductivity to 1 W / mK when formed into a molded product, the thermal conductivity filler having a thermal conductivity of 20 W / mK or more should be 30% by weight or more with respect to 100% by weight of the component (B). More preferably, it is 60% by weight or more.

  Specific examples of such heat conductive fillers include metal powder, metal flake, metal ribbon, metal fiber, beryllia, alumina, zinc oxide, magnesium oxide and other metal oxides, aluminum nitride, boron nitride, silicon nitride and other nitrides And inorganic fillers coated with a thermally conductive material, carbon powder, graphite, pitch-based carbon fiber, or PAN-based carbon fiber with a relatively high degree of graphitization, scaly carbon, and carbon nanotube. The thermal conductivity of the filler is a value measured by the laser flash method in principle. However, when the filler cannot be directly measured by the laser flash method, such as when the filler is a carbon-based material, it is indirectly measured by a method that can be measured. Measured and converted to the laser flash method. For example, in the case of 100% by volume filler based on a calibration curve showing the relationship between the filler filling amount and the thermal conductivity prepared by measuring the thermal conductivity by the optical alternating current method using a sample in which the filler is hardened with an epoxy thermosetting resin. The value obtained by calculating the thermal conductivity and converting it into the numerical value of the laser flash method can be used. Further, when measurement by such a method is not suitable, it was measured by wide-angle X-ray using a pseudo sample in which a filler (a filler having the same quality and a measurable form) was hardened with an epoxy thermosetting resin. From an X-ray parameter obtained from the graphite interlayer distance (d002) and the crystallite diameter (Lc) and a calibration curve obtained in advance from the thermal conductivity by the laser flash method, from the measurement sample d002 and Lc measured by wide-angle X-rays A value converted into the thermal conductivity of the laser flash method using the calibration curve can be used.

Specific examples of the heat conductive material in the inorganic filler coated with the heat conductive material include aluminum, nickel, silver, carbon, SnO ₂ (antimony doped) and In ₂ O ₃ (antimony doped). Can do. Examples of the inorganic filler to be coated include mica, glass beads, glass fibers, carbon fibers, barium sulfate, zinc oxide, titanium oxide, and silicon carbide whiskers. Examples of the coating method include a vacuum deposition method, a sputtering method, an electroless plating method, and a baking method. The inorganic filler coated with these thermally conductive materials may also be subjected to surface treatment with a surface treatment agent such as titanate, aluminate and silane.

  In the present invention, among the thermal conductive fillers, alumina, zinc oxide, aluminum nitride, boron nitride are used to achieve a high balance of thermal conductivity, roundness and lightness of the resin composition for torque limiter parts. It is preferable to use silicon nitride, carbon powder, graphite, PAN-based or pitch-based carbon fibers, carbon flakes, scaly carbon, carbon nanotubes, and the like.

  Furthermore, in the present invention, in order to further impart rigidity, it is preferable to use a fibrous form as at least one filler to be used. For example, it is preferable to combine a PAN-based or pitch-based carbon fiber and a non-fibrous thermally conductive filler such as graphite, alumina, carbon flake, etc. In particular, if strength is required, PAN-based carbon fiber and graphite or pitch-based carbon When fiber and alumina, and high thermal conductivity are required, it is preferable to use a combination of pitch-based carbon fiber and graphite.

  In the present invention, it is preferable to control the blending ratio of the fibrous filler and the non-fibrous filler in order to improve the thermal cycle characteristics. Specifically, (B) the fibrous filler and the non-fibrous filler in the filler are controlled. The blending ratio is preferably 4/6 to 1/9 (weight ratio), and the blending ratio of the fibrous filler and the non-fibrous filler is more preferably 3/7 to 1/9 (weight ratio).

  In the present invention, the reason why the thermal cycle characteristics are dramatically improved by controlling the blending ratio of the fibrous filler and the non-fibrous filler is that the anchor effect by the fibrous filler and the strain relaxation effect by the non-fibrous filler are high. Estimated to be balanced.

  As a method for distinguishing between the fibrous filler and the non-fibrous filler in the composition, a fiber filler (including a whisker-like shape) having a fiber length / fiber diameter ratio of 3 or more is used as a fibrous filler. Others are defined as non-fibrous fillers.

  Specifically, as a method for distinguishing between the fibrous filler and the non-fibrous filler, first, about 5 g of the resin composition is incinerated, 100 mg of the remaining filler is sampled and dispersed in 100 cc of the surfactant. The dispersion liquid is placed on a slide glass with a dropper, and observed and photographed with a scanning electron microscope (manufactured by HORIBA). Next, the fiber length and fiber diameter of the filler are measured, 1000 fibrous fillers with a fiber length / fiber diameter ratio of 3 or more and other non-fibrous fillers are counted, and the presence of the fibrous filler and non-fibrous filler is present. Calculate the percentage.

  When measuring the fiber length and fiber diameter of carbon fiber, care should be taken because the fiber itself may oxidize and burn if the ashing conditions are incorrect, and ashing in a nitrogen atmosphere is desirable. When the thermoplastic resin to be used is soluble, the composition can be dissolved using a solvent, the fibrous filler can be taken out, and the fiber length and fiber diameter can be measured.

  In the present invention, the amount of filler added is not particularly limited as long as the thermal conductivity specified in the present invention is satisfied, and varies depending on the type of filler used, but exhibits the characteristics of the filler used and is balanced with melt processability. From the above point, the thermoplastic resin (A) and the filler (B) are 100% by weight of the total amount, and the thermoplastic resin (A) is 5 to 50% by weight and the filler (B) is 95 to 50% by weight. The resin (A) is preferably 10 to 40% by weight, and the filler (B) is preferably 90 to 60% by weight, and the thermoplastic resin (A) is 15 to 25% by weight, and the filler (B) is 85 to 75% by weight. More preferred.

  In addition, the present invention includes the following (C) fatty acid metal salt, ester compound, amide group-containing compound, epoxy compound, and phosphate ester from the viewpoint of imparting the filler interface bondability and flow improvement during processing. It is preferable to add any one or more additives, and the addition amount is usually 0 to 10 parts by weight, preferably 0.1 with respect to 100 parts by weight of the total amount of (A) thermoplastic resin and (B) filler. The range of 10 to 10 parts by weight, more preferably 0.3 to 8 parts by weight, and still more preferably 0.3 to 6 parts by weight is selected.

  (C) By setting the additive amount to 10 parts by weight or less, the additive does not bleed out on the surface of the molded product, causing the thermoplastic resin and filler interface to peel off, There is no problem that physical properties deteriorate.

  Specific examples of such additives (C) include sodium stearate, calcium stearate, magnesium stearate, potassium stearate, lithium stearate, zinc stearate, barium stearate, aluminum stearate, sodium montanate, montan. Fatty acid metal salts such as calcium oxide, magnesium montanate, potassium montanate, lithium montanate, zinc montanate, barium montanate and aluminum montanate, and derivatives thereof, stearates such as methyl stearate and stearate stearate , Myristic acid esters such as myristyl myristate, montanic acid esters, methacrylic acid esters such as behenyl methacrylate, pentaerythritol monostearate, 2-ethyl Cetyl hexanoate, coconut fatty acid methyl, methyl laurate, isopropyl myristate, octyldodecyl myristate, butyl stearate, 2-ethylhexyl stearate, isotridecyl stearate, methyl caprate, methyl myristate, methyl oleate, octyl oleate Monohydric alcohol esters and derivatives of fatty acids such as lauryl oleate, oleyl oleate, 2-ethylhexyl oleate, decyl oleate, octidodecyl oleate, isobutyl oleate, distearyl phthalate, distearyl trimellitic acid, Dimethyl adipate, dioleyl adipate, adipate, ditridecyl phthalate, diisobutyl adipate, diisodecyl adipate, dibutyl glycol adipate Fatty acid esters of polybasic acids such as 2-ethylhexyl phthalate, diisononyl phthalate, didecyl phthalate, tri-2-ethylhexyl trimellitic acid, triisodecyl trimellitic acid, stearic acid monoglyceride, palmitic acid / stearic acid monoglyceride, stearic acid mono Fatty acid esters of glycerin such as diglyceride, stearic acid / oleic acid / mono / diglyceride, behenic monoglyceride and their derivatives, sorbitan tristearate, sorbitan monostearate, sorbitan monostearate, sorbitan distearate, sorbitan monopalmitate , Sorbitan monostearate, polyethylene glycol monostearate, polyethylene glycol distearate, polypropylene glycol Monostearate, pentaerythritol monostearate, sorbitan monolaurate, sorbitan trioleate, sorbitan monooleate, sorbitan sesquioleate, sorbitan monolaurate, polyoxymethylene sorbitan monolaurate, polyoxymethylene sorbitan monopalinate, poly Oxymethylene sorbitan monostearate, polyoxymethylene sorbitan monooleate, polyoxymethylene sorbitan tetraoleate, polyethylene glycol, polyethylene glycol monolaurate, polyethylene glycol monooleate, polyoxyethylene bisphenol A laurate, pentaerythritol, pentaerythritol mono Fatty acid esters of polyhydric alcohols such as oleates and their derivatives Amide group-containing compounds such as ethylene bisstearylamide, ethylenebisoleylamide, stearyl erucamide, ethylene bisoctamide, ethylene bisdecanamide, and mixtures thereof, novolac phenyl type, bisphenol type monofunctional and polyfunctional epoxy systems Examples thereof include phosphoric esters such as compounds, aromatic phosphate esters such as triphenyl phosphate, and aromatic condensed phosphate esters.

  In the resin composition for torque limiter parts in the present invention, other components such as antioxidants and heat stabilizers (hindered phenol-based, hydroquinone-based, phosphite-based and substitutions thereof) are included within the range not impairing the effects of the present invention. Body), weathering agents (resorcinol, salicylate, benzotriazole, benzophenone, hindered amine, etc.), release agents and lubricants, pigments (cadmium sulfide, phthalocyanine, carbon black for coloring, etc.), dyes (nigrosine, etc.) , Crystal nucleating agent (talc, silica, kaolin, clay, etc.), plasticizer (octyl p-oxybenzoate, N-butylbenzenesulfonamide, etc.), antistatic agent (alkyl sulfate type anionic antistatic agent, quaternary ammonium Salt-type cationic antistatic agent, polyoxyethylene sorbitan monoste Nonionic antistatic agents such as rate, betaine amphoteric antistatic agent, etc.), can be added a flame retardant, other polymers.

  The resin composition for torque limiter parts of the present invention is usually produced by a known method. For example, it is prepared by premixing other necessary additives such as component (A), component (B), and component (C) with or without being supplied to an extruder, etc. Is done. Further, when (B) a filler is added, in order to suppress breakage of the fiber of the fibrous filler, preferably, the component (A) and other necessary additives are introduced from the base of the extruder, and (B) and (C) It adjusts by supplying a component to an extruder using a side feeder.

  When producing a resin composition, for example, melt-kneading at 180 to 350 ° C. using a single-screw extruder, twin-screw, three-screw extruder and kneader-type kneader equipped with a “unimelt” (R) type screw. To obtain a composition.

  Further, when (B) a large amount of filler is added, for example, the amount of addition exceeds 60% by weight with respect to the total amount of 100% by weight of (A) and (B). As a method for obtaining the product, for example, as disclosed in JP-A-8-1663, there is a method of extruding the head portion of the extruder, extruding, coarsely pulverizing, uniform blending, or a method of compressing the raw material into a tablet. Can be mentioned. In particular, the method of tableting by compressing the raw material is preferable from the viewpoint of the quality stability of the obtained composition.

  In the present invention, a tablet refers to a granular material obtained by compacting a raw material containing a powdery raw material in a solid phase. Such a tablet can be obtained by compression molding a raw material containing a powdery raw material in a solid phase. Can do. In the above, the solid phase state means that the thermoplastic resin component contained in the raw material is not melted. For the compression molding, it is preferable to use a molding machine having a compression roll such as a tableting machine (rotary, single-shot, double, triple) or briquette machine.

As a specific method of tableting, for example, a thermoplastic resin powder and filler are uniformly blended in a solid phase using a Banbury mixer, kneader, roll, single-screw or twin-screw extruder, etc. It can be obtained by tableting with a molding machine having a roll. Also, the thermoplastic resin raw material and filler are dry blended in advance using a Banbury mixer, kneader, or roll, or melt blended once using a single or twin screw extruder, etc., and cooled and pulverized. After forming into a powder form, it is also possible to form tablets (tablets) with a tableting machine or a molding machine having a compression roll. In this case, the thermoplastic resin component used for melt kneading is not particularly limited as long as it can be melt kneaded, either in powder form or pellet form, but it is in powder form from the point of reducing variation in characteristics due to poor dispersion of filler. Or it is preferable that it is a ground product. In addition, when a melt-kneaded composition is made into a powder using a single-screw or twin-screw extruder, if the amount of filler used is large, the fluidity deteriorates, so that extrusion from a die cannot be performed and pelletized. However, in this case, as described in JP-A-8-1663, kneading and extrusion can be performed with the head portion of the extruder being opened. When the amount of the filler is large, a flaky composition may be obtained. In the present invention, if necessary, a pellet or flake composition obtained by melt-kneading in advance by these methods is cooled and pulverized to form a powder and then tableted. In addition, these methods can be combined into tablets. That is, a raw material selected from the following (A) to (D) can be adjusted to have a desired content and tableted.
(I) Thermoplastic resin (b) Filler (c) (C) One or more of fatty acid metal salts, ester compounds, amide group-containing compounds, epoxy compounds and phosphate esters (d) (A) to (A) C) a composition obtained by melt-kneading two or more components selected from the components, the component (A) being an essential component, preferably a lump and a powder thereof, among the above methods, the process is simple In this regard, the mixture obtained by uniformly blending the raw materials (a) and (b) and, if necessary, the raw material (c) in a solid phase is formed into tablets (tablets) using a tableting machine or a molding machine having a compression roll. The method is preferred.

  As the powder of the component (A), those available in powder form such as polyarylene sulfide resin may be used. It can also be obtained by pulverizing the pellets at room temperature or by freeze pulverization. The freeze pulverization can be carried out with a generally known hammer type pulverizer, cutter type pulverizer, or stone mill type pulverizer after being frozen with dry ice or liquid nitrogen. The thermoplastic resin powder used in the present invention includes particles obtained by measurement based on a laser diffraction type particle size distribution measurement method from the viewpoint of making the composition uniform between the obtained tablets and improving the handleability of the obtained tablets. The number average particle diameter of the maximum major axis is preferably 1000 μm or less, more preferably 800 μm or less, and even more preferably 500 μm or less. In order to obtain a powder having such a particle size, the powder obtained by pulverization or the like may be appropriately sieved using a sieve having a desired size.

  As the tablet shape of the resin composition used in the present invention, when considering shape retention during transportation and easy crushability during molding, for example, cylindrical, elliptical columnar, truncated cone shape, spherical, elliptical spherical, egg shape The shape, Macek type, disk shape, cubic shape and prismatic shape can be mentioned. Among these, a cylindrical shape, an elliptical column shape, a truncated cone shape, a spherical shape, an elliptic spherical shape, an egg shape, and a Macek shape are preferable from the viewpoint of measurement stability during processing.

  Further, the tablet size of the tablet is preferably a bottom surface of 15 mm diameter or less × length of 20 mm or less, in particular, the maximum value of the bottom surface diameter or length (height) is preferably less than 15 mm, and the minimum value is 1 mm or more. It is preferable that As for the method of defining the maximum diameter and the minimum diameter with respect to those having a bottom surface that is not circular, when the maximum diameter of the circumscribed circle is specified, the maximum diameter is preferably less than 15 mm, 1 mm or more, more preferably 12 mm. Hereinafter, it is good that it is 1.5 mm or more.

  In addition, in order to keep the shape stable during transportation, the compression fracture strength value (crush strength value) when pressure is applied perpendicularly to the side of the tableting surface of the tablet or the compression surface of the compression roll, Preferably it is 5-100N, More preferably, it is 15-80N. As a method for obtaining a preferable crushing strength value, for example, it is most dependent on the raw material composition. By adding an ester-based, amide-based, or phosphorus-based additive, or in the tableting process, the raw material is uniformly distributed in the raw material supply pocket. A method of reducing the rotation speed of the compression roll, extending the pressurization time of the material on the compression roll, using a feed screw in the hopper, and effective degassing and pre-compression before roll compression by the screw High tablet density and high crushing strength can be obtained by the above method. The crushing strength value is measured by placing a tablet on a strain gauge such as a load cell, and lowering the indenter at a low speed (preferably 0.1 to 2.0 mm / sec), and straining the tablet at the time of compressive fracture. A method of measuring the pressure indicated by the gauge can be used.

  By using such a method, it becomes possible to obtain a resin composition highly filled with a filler.

  The resin composition for torque limiter parts of the present invention, when used as a torque limiter part, is measured by a laser flash method in order to prevent heat from being accumulated inside the case due to heat generated from the magnet due to hysteresis torque, and to reduce the magnetic force. The thermal conductivity is 1 W / mK or higher, preferably 2 W / mK or higher, more preferably 3 W / mK or higher. In consideration of productivity, the upper limit is preferably 150 W / mK or less. The thermal conductivity was measured by molding a square-shaped product having a length of 50 mm, a width of 50 mm, and a thickness of 3 mm obtained by melt molding the resin composition of the present invention. It is a thermal conductivity measured by a laser flash method constant measuring device after cutting 5 mm.

In addition, from the viewpoint of suppressing defects such as cracking of the case due to a sudden dimensional change due to heat generated from the magnet due to hysteresis torque, the linear expansion coefficient measured in accordance with ASTM D-696 is 2 × 10 ⁻⁵ 1 / ° C. or less. Is preferably 1.5 × 10 ⁻⁵ 1 / ° C. or less, more preferably 1 × 10 ⁻⁵ 1 / ° C. or less. When productivity is considered as the upper limit, it is 0.1 × 10 ⁻⁵ 1 / ° C. or less. The linear expansion coefficient is measured by preparing a test piece of 80 mm length × 80 mm width × 2 mm thickness obtained by melt-molding the resin composition of the present invention, and the center of the molded product is 10 mm length × A prismatic molded article having a width of 1 mm × 2 mm was cut out and measured at 30 ° C. to 150 ° C. (5 ° C./min) using TMA (manufactured by Seiko Denshi).

  The molding method for molding the resin composition for torque limiter parts of the present invention can be melt-molded by ordinary molding methods (injection molding, press molding, injection press molding, etc.). From the viewpoint of properties, injection molding and injection press molding are preferred.

  The resin composition for a torque limiter component of the present invention is suitably used for a torque limiter component, particularly a magnetic torque limiter component that requires high thermal conductivity, high dimensional stability, and roundness.

  Hereinafter, although an example is given and the present invention is explained in detail, the gist of the present invention is not limited only to the following examples.

Reference Example 1 Preparation of Thermoplastic Resin PPS In a 20 liter autoclave equipped with a stirrer and a valve at the bottom, 2383 g (20.0 mol) of 47% sodium hydrosulfide (Sankyo Kasei) and 831 g of 96% sodium hydroxide (19. 9 mol), 3960 g (40.0 mol) of N-methyl-2-pyrrolidone (NMP), and 3000 g of ion-exchanged water, and gradually heated to 225 ° C. over about 3 hours while passing nitrogen at normal pressure. After distilling 4200 g and NMP 80 g, the reaction vessel was cooled to 160 ° C. The residual water content in the system per mole of the alkali metal sulfide charged was 0.17 mole. The amount of hydrogen sulfide scattered per mole of the alkali metal sulfide charged was 0.021 mol.

  Next, 2942 g (20.0 mol) of p-dichlorobenzene (Sigma Aldrich) and 1515 g (15.3 mol) of NMP were added, and the reaction vessel was sealed under nitrogen gas. Then, while stirring at 400 rpm, the temperature was increased from 200 ° C. to 227 ° C. at a rate of 0.8 ° C./min, then increased to 274 ° C. at a rate of 0.6 ° C./min, and held at 274 ° C. for 50 minutes. Then, the temperature was raised to 282 ° C. Open the extraction valve at the bottom of the autoclave, pressurize with nitrogen, flush the contents into a vessel with a stirrer over 15 minutes, stir at 250 ° C for a while to remove most of the NMP, polyphenylene sulfide (PPS) and Solids containing salts were collected.

  The obtained solid and 15120 g of ion-exchanged water were placed in an autoclave equipped with a stirrer, washed at 70 ° C. for 30 minutes, and suction filtered through a glass filter. Next, 17280 g of ion-exchanged water heated to 70 ° C. was poured into a glass filter, and suction filtered to obtain a cake.

  The obtained cake and 11880 g of ion-exchanged water were charged into an autoclave equipped with a stirrer, and the inside of the autoclave was replaced with nitrogen, and then the temperature was raised to 192 ° C. and held for 30 minutes. Thereafter, the autoclave was cooled and the contents were taken out.

  The contents were subjected to suction filtration with a glass filter, and then 17280 g of ion-exchanged water at 70 ° C. was poured into the contents, followed by suction filtration to obtain a cake. The obtained cake was dried with hot air at 80 ° C., and further dried under vacuum at 120 ° C. for 24 hours to obtain dry PPS. The obtained PPS had a weight average molecular weight in terms of polystyrene of 20000.

The weight average molecular weight was measured by the following method.
5 mg of polymer and 5 g of 1-chloronaphthalene were weighed into a sample bottle, placed in a high-temperature filter set at 210 ° C. (SSC-9300 manufactured by Senshu Kagaku), and heated for 5 minutes (1 minute preheating, 4 minutes stirring), The sample was prepared by taking it out from the high-temperature filter and leaving it to room temperature. Subsequently, the weight average molecular weight was measured under the following measurement conditions.
GPC measurement condition device: Senshu Science SSC-7100
Column name: Senshu Science GPC3506 × 1
Eluent: 1-chloronaphthalene (1-CN)
Detector: Differential refractive index detector Detector sensitivity: Range 8
Detector polarity: +
Column temperature: 210 ° C
Pre-temperature bath temperature: 250 ° C
Pump bath temperature: 50 ° C
Detector temperature: 210 ° C
Sample-side flow rate: 1.0 mL / min
Reference side flow rate: 1.0 mL / min
Sample injection amount: 300 μL
Calibration curve preparation sample: polystyrene.

  PA6 (nylon 6): CM1001 (manufactured by Toray Industries, Inc.) is immersed in liquid nitrogen, pulverized with a sample mill (SK-M type, manufactured by Kyoritsu Riko Co., Ltd.), and classified with a sieve at 42 mesh pass and 80 mesh on. A number average particle diameter of 300 μm was obtained.

  LCP (Liquid Crystal Polyester Resin): “Siberus” L201E (manufactured by Toray Industries, Inc.) is dipped in liquid nitrogen, pulverized with a sample mill (SK-M type, manufactured by Kyoritsu Riko Co., Ltd.), 80 mesh pass with sieve, 150 mesh on And a number average particle diameter of 150 μm was obtained.

  PBT (polybutylene terephthalate): 1100S (manufactured by Toray Industries, Inc.) is immersed in liquid nitrogen, pulverized with a sample mill (SK-M type manufactured by Kyoritsu Riko Co., Ltd.), and classified with a sieve at 42 mesh pass and 80 mesh on. And a number average particle diameter of 300 μm was obtained.

Reference Example 2 Filler B-1: Carbon fiber (CF), MLD1000 (fibrous filler, PAN, average fiber length 150 μm, manufactured by Toray Industries, Inc.), thermal conductivity 3 W / mK
The thermal conductivity is determined by using a sample in which the filler is hardened with an epoxy-based thermosetting resin and measuring the thermal conductivity by the optical alternating current method. The thermal conductivity in the case of 100% is calculated and converted into the numerical value of the laser flash method.

B-2: Carbon fiber (CF), XN-100-01Z (fibrous filler, pitch system, fiber length 1000 μm, manufactured by Nippon Graphite Fiber Co., Ltd.), thermal conductivity 900 W / mK
For thermal conductivity, the filler is hardened with an epoxy-based thermosetting resin, the thermal conductivity is measured by a laser flash method, and a calibration curve is obtained from X-ray parameters obtained from d002 and Lc measured by wide-angle X-rays. It is a value converted from the d002 and Lc of the measurement sample measured by wide-angle X-rays into the thermal conductivity of the laser flash method using the calibration curve.

B-3: Graphite (CFW), CFW50A (flaky filler, average particle size 50 μm, manufactured by Chuetsu Graphite Co., Ltd.) 200 W / mK
The thermal conductivity is 100% by volume of filler based on a calibration curve that shows the relationship between the filler filling amount and the thermal conductivity by measuring the thermal conductivity by the optical alternating current method using a sample in which the filler is hardened with an epoxy-based thermosetting resin. In this case, the thermal conductivity is calculated and converted into the value of the laser flash method.

  B-4: Filling 3000 g of B-3 filler into a 20 L Henschel mixer (Mitsui Mining Co., Ltd.) and stirring, spraying 60 g of 50% 3-glycidoxypropyltrimethoxysilane solution diluted with isopropyl alcohol After spraying with a gun, heat treatment was performed for 15 minutes in a hot air dryer at 100 ° C.

B-5: Alumina, Al-32B (crushed alumina, average particle size 2 μm, surface-treated product, manufactured by Sumitomo Chemical Co., Ltd.) 26 W / mK
As a surface treatment method, 3000 g of the above alumina was put into a 20 L Henschel mixer (manufactured by Mitsui Mining Co., Ltd.) and stirred while stirring, 60 g of 50% 3-glycidoxypropyltrimethoxysilane solution diluted with isopropyl alcohol was spray gun. After performing the spraying process, heat treatment was performed for 15 minutes in a 100 ° C. hot air dryer.

  The thermal conductivity is measured by a photo alternating current method using a sample in which a filler is hardened with an epoxy-based thermosetting resin, and 100 capacity of filler is obtained from a calibration curve indicating the relationship between the filler filling amount and the thermal conductivity. The thermal conductivity in the case of% is calculated and converted to the value of the laser flash method.

  In addition, an average particle diameter is the number average measured by the sieving test method based on JIS-K0069.

Reference Example 3 Additive (use 42 mesh pass through sieve)
C-1: “PX-200” (powdered aromatic condensed phosphate ester manufactured by Daihachi Chemical Industry Co., Ltd., CAS No. 139189-30-3).

Examples 1-5, Comparative Examples 1-7
The thermoplastic resin of Reference Example 1 and the filler shown in Reference Example 2 were blended in the amounts shown in Table 1 using a ribbon blender, and the results are shown in Table 1 using a PCM30 with a three-hole strand die head (2-screw extruder; manufactured by Ikekai Tekko Co., Ltd.). Melt kneading was performed at the indicated resin temperature to obtain pellets. Subsequently, after drying with a 130 degreeC hot-air dryer for 4 hours, the evaluation mentioned later was performed.

Examples 6-14
A rotary tableting machine manufactured by Tsukishima Kikai Co., Ltd. equipped with an automatic raw material supply feeder by blending the thermoplastic resin of Reference Example 1, the filler shown in Reference Example 2 and the additive of Reference Example 3 with a Henschel mixer in the amounts shown in Table 1. Was used to form a columnar tablet (tablet resin composition) (maximum value 6 mm, minimum value 3 mm) having a diameter of 6 mm and a length of 3 mm. Subsequently, after drying for 3 hours by a 130 degreeC hot-air dryer, the following evaluation was performed.

(1) Thermal conductivity Using an injection molding machine UH1000 (80t) (manufactured by Nissei Plastic Industry Co., Ltd.), a square-shaped product (50 mm long x 50 mm wide x 3 mm thick) under the resin temperature and mold temperature conditions shown in Table 1 A film gate), and a laser flash method constant measuring device (LF / TCM-FA8510B manufactured by Rigaku Corporation) using a test piece having a thickness of 2 mm by cutting both surfaces of the molded product to a depth of 0.5 mm. Was used to measure the thermal conductivity. It can be said that the larger this value, the better the thermal conductivity.

(2) Linear expansion coefficient Using an injection molding machine UH1000 (80t) (manufactured by Nissei Plastic Industry Co., Ltd.), a test piece of 80 mm length x 80 mm width x 2 mm thickness was prepared under the resin temperature and mold temperature conditions shown in Table 1. Then, a 10 mm long × 1 mm wide × 2 mm thick prismatic molded product is cut out in the flow direction in the center of the molded product, and ASTM D is used at 30 ° C. to 150 ° C. (5 ° C./min) using TMA (manufactured by Seiko Denshi). -Measured according to -696. It can be said that the smaller this value, the better the dimensional stability.

(3) Roundness Using an injection molding machine UH1000 (80t) (manufactured by Nissei Plastic Industry Co., Ltd.), a cylindrical molded product having an outer diameter of 20 mmφ, an inner diameter of 16 mmφ, and a length of 30 mm is molded, and a three-dimensional measuring instrument (manufactured by Mitutoyo) The roundness was measured by The roundness is represented by measuring an inner circle and an outer circle of a cross section at a position 10 mm from the end, and the number of measurement points was 24. That is, 24 points on the actually measured circle were approximated by a perfect circle, and the sum of the maximum deviation to the outside and the maximum deviation to the inside from the perfect circle was taken as the roundness. It can be said that the smaller the value, the better the roundness.

(4) Cooling / heating cycle test (number of heat shock defects at the welded part of the molded product)
Using a molding machine UH1000 (80t) (manufactured by Nissei Plastic Industry Co., Ltd.), in a mold having a 50 mm length × 50 mm width × 3 mm thick square shape (film gate) under the resin temperature and mold temperature conditions shown in Table 1. Then, a metal rod made of SUS420 having a diameter of 20 mmφ was inserted and subjected to insert molding, and a square-shaped product integrated with a metal rod having a weld portion at the end of the molded product was obtained by flowing resin from the gate portion. The obtained angulated product was subjected to a heat cycle test using a thermal shock absorber (TSA-70L manufactured by ESPEC).

  The test conditions are: normal temperature (23 ° C.) → temperature drop at 5 minutes → hold at −40 ° C. for 30 minutes → temperature rise at 5 minutes → hold at 30 ° C. for 30 minutes to perform 1000 cycles of the test. The number of defective products causing cracks at the welds was measured.

(5) Endurance test (surface temperature, torque reduction rate)
Using an injection molding machine UH1000 (manufactured by Nissei Plastic Industry Co., Ltd.), the resin temperature and mold temperature shown in Table 1, and the shape and size shown in FIG. 1 (numbers in the figure indicate size (mm), the same applies hereinafter) Torque limiter part 1 was obtained. First, the hard ring 2 shown in FIG. 2 and the neodymium bond magnet 3 shown in FIG. 3 were inserted in this order from the direction B of the torque limiter component 1 having the shape shown in FIG. Further, after inserting a metal shaft made of 9.5 mmφ SUS420 material into the metal shaft insertion shaft hole portion 4 of the torque limiter component 1, the torque shaft is assembled into a paper feed friction roller, rotated at a rotational speed of 2000 rpm, and a test time of 90 The surface temperature of the torque limiter component 1 and the torque reduction rate were measured. It can be said that the lower the surface temperature and the smaller the rate of torque reduction, the less heat is trapped inside the molded product and the better the magnetic stability. The torque reduction rate was calculated from the following equation.
Torque reduction rate (%) = [torque value at initial (0 minutes) −torque value after 90 minutes] / (initial torque value) × 100

In addition, the surface temperature measured the surface temperature after 90 minutes using the infrared thermometer (made by HORIBA). The torque value is a digital force gauge (model: PGD,
Measured using Maruhishi Science Machinery Co., Ltd.

  As is apparent from the results in Table 1, the molded product obtained from the resin composition of the present invention is excellent in magnetic stability under actual use conditions, and has high thermal conductivity, high dimensional stability, and perfect circle that have not been obtained conventionally. It can be seen that it is possible to balance the properties and the thermal cycle characteristics at a high level. Moreover, melt molding is possible, and according to this, productivity can be greatly improved.

FIG. 1a is a perspective view of a torque limiter component manufactured in the embodiment, and FIG. 1b is a bottom view of the torque limiter component. FIG. 2A is a perspective view of a hard ring used in the durability test in the embodiment, and FIG. 2B is a bottom view of the hard ring. FIG. 3A is a perspective view of a neodymium bonded magnet used in the durability test in the example, and FIG. 3B is a bottom view of the neodymium bonded magnet.

Explanation of symbols

1. Torque limiter parts 2. Hard ring 3. Neodymium bonded magnet Metal shaft insertion shaft hole

Claims (6)

The total amount of the thermoplastic resin and filler is 100% by weight, and (A) contains 5 to 50% by weight thermoplastic resin and (B) 95 to 50% by weight filler, and the thermal conductivity measured by the laser flash method is A resin composition for torque limiter parts, wherein the resin composition is 1 W / mK or more. (B) The resin composition for torque limiter parts according to claim 1, wherein at least part or all of the filler is a thermally conductive filler having a thermal conductivity of 20 W / mK or more. The resin composition for torque limiter parts according to claim 1 or 2, wherein (B) the filler is a combination of a fibrous filler and a non-fibrous filler in a blending ratio of 4/6 to 1/9 (weight ratio). . (A) The resin composition for torque limiter parts according to claims 1 to 3, wherein the thermoplastic resin is at least one selected from polyamide, non-liquid crystalline polyester, liquid crystal polymer and polyarylene sulfide. 5. The resin composition for torque limiter parts according to claim 1, wherein the linear expansion coefficient measured in accordance with ASTM D-696 is 2 × 10 ⁻⁵ 1 / ° C. or less. A torque limiter component comprising the resin composition for a torque limiter component according to claim 1, wherein the component is a magnetic type.

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