JP2013032451A - High-heat conductive thermoplastic resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thermoplastic resin composition having a very high heat conductivity as compared to general-purpose plastics, and simultaneously being excellent extrusionability and blow moldability.SOLUTION: The high-heat conductive thermoplastic resin composition comprises a thermoplastic polyesteric resin, a high-heat conductive inorganic compound having a heat conductivity as a single substance of ≥5 W/mK, and a copolymer obtained by copolymerizing 30 to 100 wt% of methyl methacrylate, 0 to 70 wt% of a (meth)acrylate ester excluding methyl methacrylate, and 0 to 20 wt% of a vinylic monomer copolymerizable therewith, and having a specific viscosity of 0.5 to 7 as measured at 30°C by dissolving 0.4 g of the copolymer is dissolved in 100 cc of toluene.

Description

  The present invention relates to a high thermal conductivity thermoplastic resin composition that has both high thermal conductivity and good extrusion moldability and blow moldability, and also has good practical physical properties such as impact strength.

  When the resin composition is used for various applications such as LED lighting members, housings of personal computers and displays, electronic device materials, automobile interior and exterior, plastics have lower thermal conductivity than inorganic materials such as metal materials, Since it is a problem that it is difficult to escape the generated heat, in order to solve such a problem, an attempt to obtain a highly thermally conductive resin composition by blending a large amount of highly thermally conductive inorganic substance in the resin Widely made. Among these, high thermal conductive resin compositions based on an alloy of polycarbonate resin and thermoplastic polyester resin are various in terms of properties having impact resistance, heat resistance, molding processability, and chemical resistance. Things have been proposed.

  For example, Patent Document 1 reports a thermally conductive resin composition obtained by blending an inorganic material such as carbon fiber with an alloy of a polycarbonate resin and a polyethylene terephthalate resin. Further, Patent Document 2 reports a heat conductive resin composition having good injection moldability, in which an alloy of a polycarbonate resin and a polyethylene terephthalate resin or the like is blended with a heat conductive and electrically insulating inorganic substance.

  On the other hand, there are various research examples on the method of modifying the alloy of polycarbonate resin and polyethylene terephthalate resin so as to be suitable for blow molding and extrusion molding. For example, Patent Document 3 discloses an alloy of polycarbonate resin and polyethylene terephthalate resin. In addition, it is shown that blow moldability is improved by adding an olefin resin and a fluorine resin having three or more epoxy groups in the molecule. In Patent Document 4, the same effect is obtained by adding a compound having two or more epoxy groups to an alloy of polycarbonate resin and polyethylene terephthalate resin or the like. Patent Document 5 shows that a composition comprising a polycarbonate resin and a polyester copolymerized with a branched component is suitable for blow molding.

JP 2005-298552 A WO2007 / 066711 Japanese Patent Laid-Open No. 11-116782 Japanese Patent Laid-Open No. 10-120891 Japanese Patent Laid-Open No. 09-221588

  By using a technique as shown in Patent Document 2, a high thermal conductive resin composition excellent in injection moldability can be obtained. On the other hand, the resin composition is extruded or blow-molded. When trying to mold with a molding method different from injection molding, both the polycarbonate resin and the thermoplastic polyester resin are resins with low melt tension, which makes it difficult to perform good molding processing. Have.

  On the other hand, it is not easy to apply the techniques as shown in Patent Documents 3 to 5 to the technique of Patent Document 2 as they are.

  As a result of intensive studies to improve the extrusion moldability and blow moldability of a resin composition comprising a thermoplastic polyester resin / electrically insulating high thermal conductive inorganic compound, the present inventors added a specific compound. It was found that this effect can be easily obtained, and the present invention has been achieved.

That is, the present invention is as follows.
1) Except thermoplastic polyester resin (A), high thermal conductivity inorganic compound (B) having a single thermal conductivity of 5 W / m · K or more, methyl methacrylate 30 to 100% by weight, and methyl methacrylate ( 0.4 g is dissolved in 100 cc of toluene obtained by copolymerizing 0 to 70% by weight of a meth) acrylate monomer and 0 to 20% by weight of a vinyl monomer copolymerizable therewith. It consists of a copolymer (C) whose specific viscosity measured at 30 degreeC is 0.5-7, The heat conductive thermoplastic resin composition characterized by the above-mentioned.
2) High thermal conductive inorganic compound (B) having a thermal conductivity of 5 W / m · K or more with respect to 100 parts by weight of the thermoplastic polyester resin (A), 200 to 1200 parts by weight, methyl methacrylate 30 ˜100 wt%, obtained by copolymerizing 0 to 70 wt% of (meth) acrylic acid ester monomer excluding methyl methacrylate, and 0 to 20 wt% of vinyl monomer copolymerizable therewith. , Using 0.01 to 20 parts by weight of copolymer (C) having a specific viscosity of 0.5 to 7 measured at 30 ° C. by dissolving 0.4 g in 100 cc of toluene, 1 ) High thermal conductivity thermoplastic resin composition.

By using the method of the present invention, it is possible to obtain a high thermal conductive resin composition having high thermal conductivity, high heat resistance, and electrical insulation, and having good extrusion moldability and blow moldability.
The composite materials obtained in this way are in various forms such as resin films, resin molded products, resin foams, paints and coating agents, electronic materials, magnetic materials, catalyst materials, structural materials, optical materials, medical materials, etc. It can be widely used for various applications such as materials, automobile materials, and building materials. The polymer material obtained in the present invention can be used for general plastic molding machines such as blow molding machines and extrusion molding machines which are widely used at present, and can be molded into products having complicated shapes. Easy. In particular, it has an excellent balance of important properties such as moldability, impact resistance, chemical resistance, and thermal conductivity, so it can be used as a resin for housings such as lighting, displays, and computers that have a heat source inside. Is very useful.

Example 1 Die exit and sizing die exit / entrance shape

  The thermoplastic resin composition of the present invention comprises a thermoplastic polyester resin (A), a highly heat-conductive inorganic compound (B), 30 to 100% by weight of methyl methacrylate, and a single (meth) acrylic acid ester excluding methyl methacrylate. A ratio obtained by dissolving 0.4 g in 100 cc of toluene obtained by copolymerization of 0 to 70% by weight of a monomer and 0 to 20% by weight of a vinyl monomer copolymerizable therewith. The three components of the copolymer (C) having a viscosity of 0.5 to 7 are essential.

  The thermoplastic polyester resin (A) blended in the thermoplastic resin composition of the present invention polycondenses a divalent or higher carboxylic acid compound and a divalent or higher alcohol and / or phenol compound by a known method. It is a thermoplastic polyester obtained by this. Specific examples include polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, polyhexamethylene terephthalate, polycyclohexanedimethylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, and the like. Among these, polyethylene terephthalate and butylene terephthalate are particularly preferable.

  It does not specifically limit as a carboxylic acid compound more than bivalence, For example, C8-C22 bivalent or more aromatic carboxylic acid, these ester-forming derivatives, etc. are mentioned. Specifically, for example, phthalic acid such as terephthalic acid and isophthalic acid; naphthalenedicarboxylic acid, bis (p-carboxyphenyl) methane, anthracene dicarboxylic acid, 4-4′-diphenyldicarboxylic acid, 1,2-bis (phenoxy) ) Carboxylic acids such as ethane-4,4'-dicarboxylic acid, diphenylsulfone dicarboxylic acid, trimesic acid, trimellitic acid and pyromellitic acid, derivatives having these ester forming ability, and the like. These may be used alone or in combination of two or more. Of these, terephthalic acid, isophthalic acid, or naphthalenedicarboxylic acid is preferred from the viewpoints of ease of handling, ease of reaction, and physical properties of the resulting resin composition.

  The divalent or higher alcohol and / or phenol compound is not particularly limited, and examples thereof include aliphatic compounds having 2 to 15 carbon atoms, alicyclic compounds having 6 to 20 carbon atoms, and aromatic compounds having 6 to 40 carbon atoms. And compounds having two or more hydroxyl groups in the molecule and ester-forming derivatives thereof. Specifically, for example, ethylene glycol, propylene glycol, butanediol, hexanediol, decanediol, neopentyl glycol, cyclohexanedimethanol, cyclohexanediol, 2,2'-bis (4-hydroxyphenyl) propane, 2,2 Examples include '-bis (4-hydroxycyclohexyl) propane, hydroquinone, glycerin, pentaerythritol, and derivatives having these ester forming ability. These may be used alone or in combination of two or more. Of these, ethylene glycol, butanediol, or cyclohexanedimethanol is preferred from the viewpoints of ease of handling, ease of reaction, and physical properties of the resulting resin composition.

  The thermoplastic polyester resin (A) was obtained by copolymerizing a known copolymerizable compound in addition to the above-mentioned carboxylic acid compound and alcohol and / or phenol compound as long as desired properties are not impaired. It may be a thing. Such a copolymerizable compound is not particularly limited, and examples thereof include a divalent or higher aliphatic carboxylic acid having 4 to 12 carbon atoms, a divalent or higher alicyclic carboxylic acid having 8 to 15 carbon atoms, and the like. Examples thereof include ester-forming derivatives. Specifically, for example, dicarboxylic acids such as adipic acid, sebacic acid, azelaic acid, dodecanedicarboxylic acid, maleic acid, 1,3-cyclohexanedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid or derivatives having ester forming ability thereof Etc. Other examples include oxyacids such as p-hydroxybenzoic acid or ester-forming derivatives thereof, and cyclic esters such as ε-caprolactone.

  The thermoplastic polyester resin (A) may be a thermoplastic polyester resin obtained by partially copolymerizing a polyalkylene glycol unit in a polymer chain. Such polyalkylene glycol is not particularly limited. For example, polyethylene glycol, polypropylene glycol, poly (ethylene oxide / propylene oxide) block and / or random copolymer, bisphenol A copolymer polyethylene oxide addition polymer, propylene Examples thereof include oxide addition polymers, tetrahydrofuran addition polymers, and polytetramethylene glycol.

  The amount of the copolymer component as described above in the thermoplastic polyester resin (A) is usually 20% by weight or less, preferably 15% by weight or less, more preferably 10% by weight or less.

  The thermoplastic polyester-based resin (A) is preferably a polyalkylene terephthalate containing 80% by weight or more of an alkylene terephthalate unit because of excellent physical property balance (for example, molding processability) of the obtained resin composition. More preferred is a polyalkylene terephthalate containing the same unit in an amount of 85% by weight or more, and still more preferably 90% by weight or more.

  The thermoplastic polyester resin (A) has a logarithmic viscosity (IV) of 0.30 to 2.00 dl / g or more when measured at 25 ° C. in a mixed solvent of phenol / tetrachloroethane = 1/1 (weight ratio). Preferably there is. If the logarithmic viscosity is less than 0.30, the flame retardancy and mechanical strength of the molded product are often insufficient, and if it exceeds 2.00 dl / g, the molding fluidity tends to decrease. More preferably, it is 0.40-1.80 dl / g, More preferably, it is 0.50-1.60 dl / g.

  In the thermoplastic resin composition of the present invention, the thermoplastic polyester resin (A) may be used alone or in combination of two or more. When two or more types are used in combination, the combination is not particularly limited. For example, those having different copolymerization components and molar ratios, those having different molecular weights, and the like can be arbitrarily combined.

  In the present invention, as the high thermal conductivity inorganic compound (B) having a single thermal conductivity of 5 W / m · K or more, known high thermal conductivity inorganic compounds can be widely used. When the thermal conductivity of the high thermal conductive inorganic compound (B) alone is less than 5 W / m · K, the effect of improving the thermal conductivity of the composition is inferior. (B) The thermal conductivity of the single substance is preferably 12 W / m · K or more, more preferably 15 W / m · K or more, most preferably 20 W / m · K or more, and particularly preferably 30 W / m · K or more. Things are used. The upper limit of the thermal conductivity of the high thermal conductivity inorganic compound (B) alone is not particularly limited and is preferably as high as possible. Generally, it is 3000 W / m · K or less, more preferably 2500 W / m · K or less. Those are preferably used.

  In the case where the molded body is used in applications where electrical insulation is not particularly required, a metal-based compound, a conductive carbon compound, or the like can be used as the conductive highly thermally conductive inorganic compound. Examples of the conductive carbon compound include graphite and carbon fiber because of excellent thermal conductivity. As the metal compound, highly heat conductive inorganic compounds such as conductive metal powders, conductive metal fibers, ferrites, and metal oxides can be preferably used. As conductive metal powder, conductive metal powder obtained by atomizing various metals, as conductive metal fiber, conductive metal fiber obtained by processing various metals into fibers, as ferrite, various ferrites such as soft magnetic ferrite, metal Examples of the oxide include highly thermally conductive inorganic compounds such as metal oxides such as zinc oxide.

  Among these, one or more conductive high thermal conductive inorganic compounds selected from the group consisting of graphite, conductive metal powder, soft magnetic ferrite, carbon fiber, conductive metal fiber, and zinc oxide are preferable.

When the molded body is used for applications requiring electrical insulation, a compound exhibiting electrical insulation is preferably used as the highly thermally conductive inorganic compound. Specifically, the electrical insulating property indicates an electrical resistivity of 1 Ω · cm or more, preferably 10 Ω · cm or more, more preferably 10 ⁵ Ω · cm or more, and further preferably 10 ¹⁰ Ω · cm or more. It is preferable to use a material having a size of cm or more, most preferably 10 ¹³ Ω · cm or more. There is no particular restriction on the upper limit of the electrical resistivity, generally less 10 ¹⁸ Ω · cm. It is preferable that the electrical insulation of the molded product obtained from the high thermal conductivity thermoplastic resin composition of the present invention is also in the above range.

  Among the high thermal conductive inorganic compounds, examples of the electrically insulating high thermal conductive inorganic compounds exhibiting electrical insulation include metal oxides, metal nitrides, metal carbides, metal carbonates, insulating carbon materials, and metal hydroxides. can do. Examples of the metal oxide include aluminum oxide, magnesium oxide, silicon oxide, beryllium oxide, copper oxide, and cuprous oxide. Examples of the metal nitride include boron nitride, aluminum nitride, and silicon nitride.

  Examples of the metal carbide include silicon carbide, examples of the metal carbonate include magnesium carbonate, examples of the insulating carbon material include diamond, and examples of the metal hydroxide include aluminum hydroxide and magnesium hydroxide.

  Among these, one or more electrically insulating highly thermally conductive inorganic compounds selected from the group consisting of boron nitride, aluminum nitride, silicon nitride, aluminum oxide, and magnesium oxide are preferable. These can be used alone or in combination. Various shapes can be applied to the shape of the high thermal conductive inorganic compound. For example, particles, fine particles, nanoparticles, aggregated particles, tubes, nanotubes, wires, rods, needles, plates, irregular shapes, rugby balls, hexahedrons, large particles and fine particles are combined Various shapes such as a composite particle shape, a liquid, etc. can be exemplified. These high thermal conductivity inorganic compounds may be natural products or synthesized ones. In the case of a natural product, there are no particular limitations on the production area and the like, which can be selected as appropriate. These high thermal conductive inorganic compounds may be used alone or in combination of two or more different shapes, average particle diameters, types, surface treatment agents, and the like.

  These highly heat-conductive inorganic compounds may be those that have been surface-treated with a surface treatment agent in order to enhance the adhesion at the interface between the resin and the inorganic compound or to facilitate workability. It does not specifically limit as a surface treating agent, For example, conventionally well-known things, such as a silane coupling agent and a titanate coupling agent, can be used. Among them, an epoxy group-containing silane coupling agent such as epoxy silane, an amino group-containing silane coupling agent such as aminosilane, polyoxyethylene silane, and the like are preferable because they hardly reduce the physical properties of the resin. The surface treatment method of the inorganic compound is not particularly limited, and a normal treatment method can be used.

  In the present invention, the high thermal conductivity inorganic compound (B) having a single thermal conductivity of 5 W / m · K or more is usually 200 to 1200 with respect to 100 parts by weight of the thermoplastic polyester resin (A). Although used by weight, it is preferable to use 250 to 1000 parts by weight, and more preferably 300 to 900 parts by weight.

In the present invention, the copolymer (C) is composed of 30 to 100% by weight of methyl methacrylate, 0 to 70% by weight of (meth) acrylic acid excluding methyl methacrylate, and a vinyl monomer copolymerizable therewith. It is a copolymer having a specific viscosity of 0.5 to 7 measured at 30 ° C. by dissolving 0.4 g in 100 cc of toluene obtained by copolymerization of ˜20% by weight. Here, (meth) acrylic acid ester means acrylic acid ester and methacrylic acid ester.
Specific examples of the methacrylic acid ester excluding methyl methacrylate include methacrylic acid alkyl esters such as ethyl methacrylate, propyl methacrylate, butyl methacrylate and 2-ethylhexyl methacrylate. Specific examples of the acrylate ester include alkyl acrylate esters of alkyl groups such as methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, and 2-ethylhexyl acrylate. These may be used alone or in combination of two or more.

  It is preferable that the carbon number of the ester part of the (meth) acrylic-acid alkylester of a copolymer (C) is 1-12 from the point of workability.

  Specific examples of vinyl monomers copolymerizable with these include aromatic vinyl such as styrene and α-methylstyrene and unsaturated nitrile such as acrylonitrile. These may be used alone or in combination of two or more.

  The copolymer (C) is composed of 30 to 100% by weight of methyl methacrylate, 0 to 70% by weight of (meth) acrylic acid ester excluding methyl methacrylate, and 0 to 20 vinyl monomers copolymerizable therewith. The weight percentage is preferable from the viewpoint of processability and uniformity of the resin composition obtained. More preferably, methyl methacrylate is 60 to 90% by weight, (meth) acrylic acid ester excluding methyl methacrylate is 0 to 40% by weight, and vinyl monomer is 0 to 10% by weight. More preferably, methyl methacrylate is 70 to 85% by weight, (meth) acrylic acid ester excluding methyl methacrylate is 0 to 30% by weight, and vinyl monomer is 0 to 5% by weight.

  Further, when 0.4 g of the copolymer obtained from the copolymer (C) is dissolved in 100 cc of toluene and the specific viscosity measured at 30 ° C. is less than 0.5, sufficient workability improvement effect is obtained. If it exceeds 7 and the resulting resin composition is not uniform, it is not preferred.

  The copolymer (C) can be obtained by carrying out emulsion polymerization in the presence of an appropriate medium, an emulsifier and a polymerization initiator. Moreover, the monomer component which comprises a copolymer (C) can be emulsion-polymerized, the polymer latex of a copolymer (C) can be obtained, and also it can superpose | polymerize by adding a monomer component further. Water is usually used as the medium used in this emulsion polymerization. As the emulsifier, known anionic surfactants and nonionic surfactants are used. As the polymerization initiator, a normal water-soluble or oil-soluble single type or redox type is used.

  There are various commercially available copolymers (C), such as Kaneace PA40, PA60 (above, manufactured by Kaneka Corporation), P530, P531 (above, manufactured by Mitsubishi Rayon Co., Ltd.). These are typical examples.

  By adding the copolymer, the melt tension in the extruder of the resin composition is increased and the kneadability is improved. As a result, it is considered that the inorganic filler is uniformly dispersed and the thermal conductivity is improved. Furthermore, it is considered that, by improving the surface properties of the molded product, for example, during insert molding, the contact thermal resistance with the metal processed product is reduced, and the heat dissipation is also improved.

The usage-amount of a copolymer (C) is 0.01-20 weight part with respect to 100 weight part of polyester-type resin (A), Preferably it is 0.03-17 weight part, More preferably, it is 0.05. ~ 15 parts by weight. When the addition amount is less than 0.01 part by weight, the effect of improving the blow moldability is small, and when it exceeds 20 parts by weight, the surface property of the obtained molded article is deteriorated.
In the resin composition of the present invention, known inorganic fillers can be widely used depending on the purpose in addition to the above-described highly thermally conductive inorganic compound.

  Examples of inorganic fillers other than the high thermal conductivity inorganic compound include diatomaceous earth powder; basic magnesium silicate; calcined clay; fine powder silica; quartz powder; crystalline silica; kaolin; talc; antimony trioxide; Examples thereof include molybdenum sulfide; rock wool; ceramic fiber; inorganic fiber such as asbestos; and glass fillers such as glass fiber, glass powder, glass cloth, and fused silica.

  By using these fillers, for example, it is possible to improve favorable characteristics in applying a resin composition such as thermal conductivity, mechanical strength, or abrasion resistance. Further, if necessary, organic fillers such as paper, pulp, wood, synthetic fibers such as polyamide fiber, aramid fiber, and boron fiber; resin powder such as polyolefin powder; can be used in combination.

  The resin composition of the present invention includes an epoxy resin, a polyolefin resin, a styrene resin, a liquid crystal polymer, a bismaleimide resin, a polyimide resin, a polyether resin, a phenol resin, and a silicone resin as long as the effects of the present invention are not lost. Any known resin such as polyamide resin, polyester resin, fluorine resin, acrylic resin, melamine resin, urea resin, urethane resin may be contained. Specific examples of preferred resins include liquid crystal polymer, nylon 6, nylon 6,6, MBS resin, MB resin, ABS resin, AAS resin, AES resin, olefin elastic resin, and the like. When these resins are used in combination, the amount used is preferably from 0 to 10,000 parts by weight with respect to 100 parts by weight of the thermoplastic resin (A) usually contained in the resin composition.

  In the resin material of the present invention, as an additive other than the above resin and filler, any other components depending on the purpose, for example, reinforcing agent, thickener, release agent, coupling agent, flame retardant, flame resistance Agents, pigments, colorants, other auxiliaries and the like can be added as long as the effects of the present invention are not lost. The amount of these additives used is preferably in the range of 0 to 200 parts by weight in total with respect to 100 parts by weight of the thermoplastic resin.

The method for producing the composition of the present invention is not particularly limited. For example, it can be produced by drying the above-described components, additives and the like and then melt-kneading them in a melt-kneader such as a single-screw or twin-screw extruder. Moreover, when a compounding component is a liquid, it can also manufacture by adding to a melt-kneader on the way using a liquid supply pump etc.
The composition of the present invention can be suitably used as a highly heat-conductive extruded product or a highly heat-conductive pro-molded product because of its excellent heat conductivity and appearance of the molded product. Molding is suitable.

  Examples of usage forms include various forms such as a resin film, a resin molded product, a resin foam, a paint and a coating agent. As a molding method, for example, injection molding, vacuum molding, press molding, calendar molding, and the like can be used in addition to the above-described extrusion molding and blow molding.

  Since the highly heat-conductive thermoplastic resin composition obtained in the present invention is excellent in extrusion moldability, currently widely used extrusion molding machines can be used, and can be used for long products having irregular shapes, sheets and film shapes. Even if it is continuous molding, etc., molding is easy. Moreover, since it is excellent in blow moldability, a blow molding machine widely used at present can be used, and even a product having a hollow three-dimensional shape can be easily molded.

  The thermoplastic resin composition of the present invention can be widely used for various applications such as electronic materials, magnetic materials, catalyst materials, structural materials, optical materials, medical materials, automobile materials, and building materials. In particular, since it has excellent properties such as excellent appearance of molded products and high thermal conductivity, it is very useful as a resin material for heat dissipation and heat transfer.

  The thermoplastic resin composition of the present invention can be suitably used for injection molded products such as lighting members such as LED lighting, home appliances, OA equipment parts, AV equipment parts, automobile interior and exterior parts, and the like. In particular, it can be suitably used as an exterior material in home appliances and office automation equipment that generate a lot of heat. Furthermore, in an electronic device having a heat source inside but difficult to be forcibly cooled by a fan or the like, it is suitably used as an exterior material for these devices in order to dissipate the heat generated inside to the outside. In an illumination member such as an LED illumination, it is suitably used as a heat dissipation material in an LED bulb or a straight tube type LED fluorescent lamp.

  Among these, small or portable electronic devices such as portable computers such as notebook computers, PDAs, cellular phones, portable game machines, portable music players, portable TV / video devices, portable video cameras, etc. are preferable among these. It is very useful as a resin for housings, housings, and exterior materials. It can also be used very effectively as a resin for battery peripherals in automobiles, trains, etc., a resin for portable batteries in home appliances, a resin for power distribution parts such as breakers, and a sealing material for motors.

  The high heat conductive thermoplastic resin composition for extrusion molding of the present invention has a good molding processability because the amount of the high heat conductive inorganic substance can be reduced as compared with a conventionally well-known composition. It has characteristics useful as a component such as a substrate in an application or a housing.

  Hereinafter, the present invention will be described in more detail with reference to examples. However, the present invention is not limited to these examples.

[Evaluation method]
[Thermal conductivity]: Two plate columnar test pieces of 30 mm square x 3.0 mm thickness were cut out from the obtained extrusion molded product or blow molded product, and a 4φ sensor was used with a hot disk method thermal conductivity measuring device manufactured by Kyoto Electronics Industry Co., Ltd. The thermal conductivity was measured at
[Appearance of molded product]: Appearance defects such as irregularities and filler floating on the surface of the obtained extruded product were visually observed and evaluated according to the following criteria. A: Appearance is very good, B: Appearance is good, B: Appearance is partially good but almost good, B: Appearance is poor.

Example 1
PBK-2 (A-1), which is a polyethylene terephthalate resin manufactured by Mitsubishi Chemical Corporation, is used as the thermoplastic polyester resin (A), and (A-1): 30 parts by weight of methyl methacrylate with respect to 100 parts by weight. 100% by weight, obtained by copolymerizing 0 to 70% by weight of a monomer of (meth) acrylic acid ester excluding methyl methacrylate, and 0 to 20% by weight of a vinyl monomer copolymerizable therewith, 1 part by weight of PA60 (C-1) resin manufactured by Kaneka Corporation as a copolymer (C) having a specific viscosity of 0.5-7 measured at 30 ° C. by dissolving 0.4 g in 100 cc of toluene, In addition, 0.2 parts by weight of Adeka Stab AO-60 (D-1) and Adeka Stub HP-10 (D-2) (both trade names made by ADEKA) as stabilizers were mixed in a super floater (raw material) ).

  Separately, hexagonal boron nitride powder (SGP manufactured by Denki Kagaku Kogyo Co., Ltd., thermal conductivity of 60 W / m · K, volume average particle diameter 21.0 μm, electrical insulation) as highly heat conductive inorganic compound (B) (B-1) and glass fiber (T-187H / PL manufactured by Nippon Electric Glass Co., Ltd.) (GF-1) as other fillers, both of which are (B-1) / (GF- 1) It mixed so that it might become = 30/20 (raw material 2).

  The raw material 1 was supplied from a hopper which is a first supply port provided in the vicinity of a screw base of a TEX44 co-meshing twin screw extruder manufactured by Nippon Steel Works. A kneading disc having an angle of 90 ° C. was inserted into the screw at a position before the second supply port, and a vent port opened to atmospheric pressure was provided at a position where the kneading disc portion was completed. A side feeder was installed right next to the vent port, and the raw material 2 was forcibly pressed from the second supply port with the side feeder. By controlling the supply amounts from both supply ports, the raw material 1 and the raw material 2 were mixed so that the volume ratio was 1/1.

  A decompression vent port connected to a decompression pump was provided at an intermediate portion between the second supply port and the screw tip. The screw rotation speed was set to 150 rpm and the discharge amount per hour was set to 50 kg / hr. The set temperature was 100 ° C. in the vicinity of the first supply port, and the set temperature was sequentially increased, and the front of the kneading disk was set to 270 ° C. The temperature from the kneading disk part to the atmospheric pressure release vent port was set to 270 ° C., the pressure from the atmospheric pressure release vent port to the second supply port was set to 275 ° C., and the distance from the second supply port to the screw tip was set to 270 ° C. Under these conditions, a high heat conductive thermoplastic resin composition for molding was obtained.

  The obtained composition was dried at 130 ° C. for 4 hours, and then subjected to extrusion molding using a 40 mm single-screw extruder 10VSE-40-28V manufactured by Osaka Seiki. Molding conditions were set at a cylinder temperature of 260 ° C and a die temperature of 245 ° C, and after passing through a sizing die (set temperature of 90 ° C) placed 5 cm away from the die, it was taken out and extruded When the processing was carried out, the extrusion moldability was good. The shape of the entrance / exit of the die outlet and the sizing die is shown in FIG.

  As a result of evaluating the thermal conductivity of the obtained molded product, the appearance of the extruded product was ◎ and the thermal conductivity was 1.4 W / mK.

  The obtained composition was blow molded into a square columnar hollow molded body of 60 mm × 60 mm × 100 mm and an average thickness of 2.5 mm with a DA-50 type blow molding machine manufactured by Plako Corporation. Molding conditions were set at a parison temperature of about 260 ° C., an injection speed (index) of 150, a screw rotation speed of 60 rpm, a blow pressure of 0.59 MPa (nitrogen), a cooling time of 100 seconds, and a mold temperature of 90 ° C. It was good. As a result of evaluating the molded product, the appearance of the blow molded product was ◎, and the thermal conductivity was 1.4 W / mK.

(Example 2)
Evaluation was performed in the same manner as in Example 1 except that PA60 was changed to 15 parts by weight. Results, extrusion moldability: good, extrusion molded product appearance: ：, thermal conductivity: 1.5 W / mK, blow moldability: good, blow molded product appearance: 、, thermal conductivity: 1.5 W / mK. It was.

(Example 3)
Instead of (A-1), (A-2): other than using polybutylene terephthalate resin having a logarithmic viscosity of 0.85 (25 ° C., dl / g, phenol / tetrachloroethane = 1/1 (weight ratio)) Were evaluated in the same manner as in Example 1. Results, extrusion moldability: good, extrusion molded product appearance: ：, thermal conductivity: 1.5 W / mK, blow moldability: good, blow molded product appearance: 、, thermal conductivity: 1.5 W / mK. It was.

Example 4
(B-2) instead of (B-1): Round alumina powder (AS-40 manufactured by Showa Denko KK, single body thermal conductivity 36 W / m · K, volume average particle diameter 20 μm, electrical insulation Evaluation was carried out in the same manner as in Example 1 except that the property was used. Result, extrusion moldability: good, extrusion molded product appearance: 、, thermal conductivity: 1.0 W / mK, blow moldability: good, blow molded product appearance: 、, thermal conductivity: 1.0 W / mK. It was.

(Example 5)
Instead of (B-1), (B-3): Boron nitride powder (PT-110 manufactured by Momentive Performance Materials, thermal conductivity 80 W / m · K as a single unit, volume average particle diameter 36 μm, electrical insulation) Evaluation was performed in the same manner as in Example 1 except that was used. Results, extrusion moldability: good, extruded product appearance: 外 観, thermal conductivity: 1.7 W / mK, blow moldability: good, blow molded product appearance: 、, thermal conductivity: 1.7 W / mK. It was.

(Comparative Example 1)
Evaluation was performed in the same manner as in Example 1 except that (C-1) was not added. Result, extrusion moldability: poor, extrusion molded product appearance: x, thermal conductivity: 1.4 W / mK, blow moldability: poor, blow molded product appearance: x, thermal conductivity: 1.4 W / mK. It was.
From the above, it can be seen that the thermoplastic resin composition of the present invention provides a high thermal conductivity thermoplastic resin composition excellent in the balance between various physical properties and thermal conductivity, and is excellent in extrusion moldability and blow moldability.

Claims (2)

Except thermoplastic polyester resin (A), high thermal conductivity inorganic compound (B) having a thermal conductivity of 5 W / m · K or more as a simple substance, methyl methacrylate 30 to 100% by weight, and methyl methacrylate (meth) 0.4 g is dissolved in 100 cc of toluene obtained by copolymerizing 0 to 70% by weight of an acrylate monomer and 0 to 20% by weight of a vinyl monomer copolymerizable therewith. A high thermal conductive thermoplastic resin composition comprising a copolymer (C) having a specific viscosity of 0.5 to 7 measured at ° C. High thermal conductive inorganic compound (B) having a thermal conductivity of 5 W / m · K or more with respect to 100 parts by weight of the thermoplastic polyester resin (A), 200 to 1200 parts by weight, methyl methacrylate 30 to 100 100 cc obtained by copolymerizing 0% to 70% by weight of a monomer of (meth) acrylic acid ester excluding methyl methacrylate and 0 to 20% by weight of a vinyl monomer copolymerizable therewith The copolymer (C) 0.01 to 20 parts by weight having a specific viscosity of 0.5 to 7 measured at 30 ° C. by dissolving 0.4 g in toluene of claim 1 is used. The high thermal conductivity thermoplastic resin composition described.

Images