JP6085562B2 - Polybutylene terephthalate resin composition - Google Patents

Description

  The present invention relates to a polybutylene terephthalate resin composition suitable as a raw material for an outdoor electric member such as a connection structure for a photovoltaic power generation module.

  Solar power generation modules that convert solar light energy into electricity (hereinafter sometimes referred to simply as “modules”) have a junction box for connecting cables between modules in order to take out the electricity in a useful form. A connector is provided for each module. In the junction box, there are bypass diodes, etc., and even if the surface of the photovoltaic module is partially shaded or the battery cell breaks down and the output of the module is reduced, the effect is affected. Ingenuity to minimize is made. In this case, since the bypass diode may generate heat and ignite, the entire junction box is required to have flame retardancy. As a countermeasure against such heat generation, a method of dissipating heat by increasing the number of diodes, heat conduction by attaching a metal heat sink to the bypass diode, or increasing the volume of the junction box has been proposed ( (See Patent Documents 1 and 2).

  Junction boxes are sometimes installed outdoors such as on roofs as accessory parts of photovoltaic modules, so they are required to have impact resistance against flying objects, especially at low temperatures. Is required. In order to improve the impact resistance of the junction box, the product thickness is increased or the box is enlarged. As with the junction box, the photovoltaic module connector is also required to have impact resistance. As described above, the outdoor electrical member is often required to have excellent flame retardancy and impact resistance.

  By the way, polybutylene terephthalate is used as a raw material for electrical and electronic parts, automobile parts, mechanical parts and the like by taking advantage of its excellent mechanical properties, electrical properties, heat resistance, chemical resistance and the like. In electrical and electronic parts, industrial equipment, and architectural applications, fire resistance from electrical and electronic parts, and in industrial equipment, there is a strong demand for flame retardancy due to the risk of fire spread due to welding, spatter, etc. Polybutylene terephthalate containing a flame retardant A resin composition may be used as a raw material (see, for example, Patent Document 3).

International Publication No. 2005/117141 Pamphlet Japanese Utility Model Publication No.5-1253 JP 2010-006937 A

  A polybutylene terephthalate resin composition containing a flame retardant seems to be suitable as a raw material for an outdoor electric member. However, in the case of a polybutylene terephthalate resin composition blended with a flame retardant, the impact resistance at low temperatures of a molded article formed by molding the resin composition tends to be lowered. And when it is going to improve the impact resistance in the low temperature of the said molded object, when it adds an elastomer, it exists in the tendency for a flame retardance not to raise notably.

  The present invention has been made to solve the above-mentioned problems, and its purpose is to have remarkably excellent flame retardancy, excellent mechanical properties, and impact resistance (impact resistance at room temperature only). In addition, an object of the present invention is to provide a polybutylene terephthalate resin composition having excellent impact resistance at low temperatures.

  The inventors of the present invention have made extensive studies to solve the above problems. As a result, the inventors have found that the above problems can be solved by blending a specific elastomer and polycarbonate with polybutylene terephthalate blended with a flame retardant, and have completed the present invention. More specifically, the present invention provides the following.

  (1) Polybutylene terephthalate, polycarbonate, a core-shell elastomer, and a flame retardant. In the core-shell elastomer, the core is a styrene butadiene rubber, the shell is an alkyl (meth) acrylate, and the core-shell system. A polybutylene terephthalate resin composition having an elastomer content of 5% by mass or more and 20% by mass or less based on the total composition.

  (2) The polybutylene terephthalate resin composition according to (1), wherein a mass ratio of the polybutylene terephthalate and the polycarbonate (content of polybutylene terephthalate / content of polycarbonate) is 6/4 or more and 9/1 or less. object.

  (3) The polybutylene terephthalate resin composition according to (1) or (2), wherein the content of the polycarbonate is 20% by mass or more.

  (4) The polybutylene terephthalate resin composition according to any one of (1) to (3), wherein the flame retardant is a bromine-containing flame retardant.

  (5) A resin molded product obtained by molding the polybutylene terephthalate resin composition according to any one of (1) to (4).

  (6) The resin molded product according to (5), which is an outdoor electric member.

  (7) The resin molded body according to (6), wherein the electric member for outdoor use is a solar cell, an outdoor breaker, an outdoor switch, a connector for electric vehicle, or an electronic component casing for electric vehicle.

  The polybutylene terephthalate resin composition of the present invention has remarkably excellent flame retardancy, excellent mechanical properties, and excellent impact resistance at room temperature and low temperature.

  Hereinafter, embodiments of the present invention will be described. In addition, this invention is not limited to the following embodiment.

  The polybutylene terephthalate resin composition of the present invention includes polybutylene terephthalate, polycarbonate, a specific core-shell elastomer, and a flame retardant.

<Polybutylene terephthalate>
Polybutylene terephthalate is a dicarboxylic acid component containing at least terephthalic acid or an ester-forming derivative thereof (C ₁ -C ₆ alkyl ester, acid halide, etc.), and an alkylene glycol (1,4-carbon atom) having at least 4 carbon atoms. Butanediol) or a polybutylene terephthalate obtained by polycondensation with a glycol component containing an ester-forming derivative thereof. The polybutylene terephthalate is not limited to homopolybutylene terephthalate, but may be a copolymer containing 60 mol% or more (particularly 75 mol% or more and 95 mol% or less) of butylene terephthalate units.

In polybutylene terephthalate, examples of dicarboxylic acid components (comonomer components) other than terephthalic acid and its ester-forming derivatives include, for example, isophthalic acid, phthalic acid, 2,6-naphthalenedicarboxylic acid, 4,4′-dicarboxydiphenyl ether, and the like. C ₈ -C ₁₄ aromatic dicarboxylic acids; C ₄ -C ₁₆ alkyl dicarboxylic acids such as succinic acid, adipic acid, azelaic acid and sebacic acid; C ₅ -C ₁₀ cycloalkyl dicarboxylic acids such as cyclohexane dicarboxylic acid Ester-forming derivatives of these dicarboxylic acid components (C ₁ -C ₆ alkyl ester derivatives, acid halides, etc.). These dicarboxylic acid components can be used alone or in combination of two or more.

In the polybutylene terephthalate, examples of glycol components (comonomer components) other than 1,4-butanediol include, for example, ethylene glycol, propylene glycol, trimethylene glycol, 1,3-butylene glycol, hexamethylene glycol, neopentyl glycol, 1 , alkylene glycol C ₂ -C ₁₀ and 3-octanediol; diethylene glycol, triethylene glycol, polyoxyalkylene glycol and dipropylene glycol; cyclohexanedimethanol, alicyclic diols such as hydrogenated bisphenol a; bisphenol a, Aromatic diols such as 4,4'-dihydroxybiphenyl; ethylene oxide 2 mol adduct of bisphenol A, propylene oxide 3 mol adduct of bisphenol A Of alkylene oxide adducts of C ₂ -C ₄ bisphenol A; or ester-forming derivatives of these glycols (acetylated, etc.). These glyco components can be used alone or in combination of two or more.

  Any of the polybutylene terephthalate copolymers obtained by copolymerizing the comonomer components described above can be suitably used as polybutylene terephthalate. Further, as polybutylene terephthalate, a homopolybutylene terephthalate polymer and a polybutylene terephthalate copolymer may be used in combination.

  The amount of terminal carboxyl groups of the polybutylene terephthalate of the present invention is not particularly limited as long as the object of the present invention is not impaired. The amount of terminal carboxyl groups of polybutylene terephthalate is preferably 30 meq / kg or less, and more preferably 25 meq / kg or less. When polybutylene terephthalate having a terminal carboxyl group content in such a range is used, the resulting polybutylene terephthalate resin composition is particularly excellent in heat shock resistance, and the strength is reduced by hydrolysis in a humid heat environment. More difficult to receive.

  The melt flow rate of the polybutylene terephthalate of the present invention is not particularly limited as long as the object of the present invention is not impaired. The melt flow rate of polybutylene terephthalate is preferably 6 g / 10 min or more and 50 g / 10 min or less. More preferably, they are 7 g / 10min or more and 30 g / 10min or less. When polybutylene terephthalate having a melt flow rate in such a range is used, the resulting polybutylene terephthalate resin composition is particularly excellent in moldability. Also, the melt flow rate can be adjusted by blending polybutylene terephthalates having different melt flow rates. For example, a polybutylene terephthalate having a melt flow rate of 20 g / 10 min can be prepared by blending polybutylene terephthalate having a melt flow rate of 50 g / 10 min and polybutylene terephthalate having a melt flow rate of 8 g / 10 min. The melt flow rate of polybutylene terephthalate can be measured under conditions based on ISO1133.

  The content of polybutylene terephthalate in the polybutylene terephthalate resin composition of the present invention is not particularly limited, but is preferably determined by adjusting with the content of polycarbonate described later.

<Polycarbonate>
Polycarbonate is a solvent method, that is, a reaction of a dihydric phenol and a carbonate precursor such as phosgene in the presence of a known acid acceptor or molecular weight modifier in a solvent such as methylene chloride, or a dihydric phenol and diphenyl carbonate. It can manufacture by the transesterification reaction with such a carbonate precursor. Here, bisphenols can be illustrated as a dihydric phenol. More specifically, 2,2-bis (4-hydroxyphenyl) propane, that is, bisphenol A can be exemplified. Further, a part or all of bisphenol A may be substituted with another dihydric phenol. Examples of dihydric phenols other than bisphenol A include hydroquinone, 4,4-dihydroxydiphenyl, bis (4-hydroxyphenyl) alkane, bis (4-hydroxyphenyl) cycloalkane, bis (4-hydroxyphenyl) sulfide, bis ( 4-hydroxyphenyl) sulfone, bis (4-hydroxyphenyl) sulfoxide, compounds such as bis (4-hydroxyphenyl) ether or bis (3,5-dibromo-4-hydroxyphenyl) propane, bis (3,5- Illustrative are halogenated bisphenols such as (dichloro-4-hydroxyphenyl) propane. These dihydric phenols may be homopolymers of dihydric phenols or two or more copolymers. Further, the polycarbonate used in the present invention may be a thermoplastic random branched polycarbonate obtained by reacting a polyfunctional aromatic compound with a dihydric phenol and / or a carbonate precursor. The polybutylene terephthalate resin composition may contain a plurality of types of polycarbonate.

  The melt flow rate of the polycarbonate of the present invention is not particularly limited as long as the object of the present invention is not impaired. The melt flow rate of the polycarbonate is preferably 3 g / 10 min or more and 30 g / 10 min or less. More preferably, they are 13 g / 10min or more and 24 g / 10min or less. When a polycarbonate having such a melt flow rate is used, the resulting polybutylene terephthalate resin composition is particularly excellent in moldability.

  The kind of polycarbonate is not particularly limited. Further, the content of the polycarbonate in the polybutylene terephthalate resin composition is not particularly limited, and is preferably determined by adjusting with the content of polybutylene terephthalate. From the viewpoint of impact resistance, it is 10% by mass or more. More preferably, it is particularly preferably 20% by mass or more. Details of the content of polybutylene terephthalate and the content of polycarbonate will be described later.

  Regarding the details of the content of polybutylene terephthalate and the content of polycarbonate, the mass ratio of polybutylene terephthalate and polycarbonate (content of polybutylene terephthalate / content of polycarbonate) is 6/4 or more and 9/1 or less. Preferably there is. If it is 6/4 or more, it is preferable because it shows excellent mechanical properties, electrical properties, dry heat resistance and chemical resistance of polybutylene terephthalate, and if it is 9/1 or less, it is preferable because it is excellent in impact resistance. More preferably, it is 6/4 or more and 8/2 or less.

<Core shell elastomer>
The specific core-shell type elastomer is a styrene-butadiene rubber whose core is an acrylic polymer composed of repeating units derived from alkyl (meth) acrylate. By using a specific core-shell elastomer, the core-shell elastomer is dispersed in the polycarbonate dispersed in the polybutylene terephthalate, and the impact resistance of the polybutylene terephthalate resin composition (especially impact resistance at low temperatures) is improved. It is estimated that it can be remarkably improved.

  In general, when an elastomer component is contained in the polybutylene terephthalate resin composition, the flame retardancy of the resin composition tends to decrease. However, when the specific core-shell type elastomer is contained, it is presumed that the burn-through resistance during combustion is improved.

Furthermore, generally, the elastomer component tends to lower the fluidity of the polybutylene terephthalate resin composition. However, the specific core-shell elastomer can improve impact resistance and burn-through resistance without greatly reducing the fluidity during molding, so the resulting polybutylene terephthalate resin composition has good fluidity. Indicates. Here, good fluidity means that the melt viscosity at a temperature of 260 ° C. and a shear rate of 1000 sec ⁻¹ is less than 0.35 kPa · s.

  Examples of the alkyl (meth) acrylate include methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate and the like. In the present invention, the alkyl (meth) acrylate is preferably alkyl methacrylate, and most preferably methyl methacrylate.

  The acrylic polymer may contain a repeating unit derived from a monomer other than alkyl (meth) acrylate as long as the effects of the present invention are not significantly impaired.

  Styrene butadiene rubber is a polymer containing styrene and butadiene as main copolymerization components. The styrene-butadiene rubber may contain a copolymer component other than styrene and butadiene as long as the effects of the present invention are not significantly impaired.

  The content of the core-shell elastomer in the polybutylene terephthalate resin composition is 5% by mass or more and 20% by mass or less. The content of 5% by mass or more is necessary for the reason of improving low temperature impact property. Moreover, it is necessary for the reason that it is 20 mass% or less not to impair flame retardance, dry heat resistance, and fluidity. A more preferable content of the core-shell elastomer is 15% by mass or more and 20% by mass or less.

  The type of flame retardant is not particularly limited. For example, halogen-containing flame retardant, phosphorus-containing flame retardant, nitrogen-containing flame retardant, sulfur-containing flame retardant, silicon-containing flame retardant, alcohol flame retardant, inorganic flame retardant, aromatic resin A flame retardant etc. can be illustrated. In the present invention, it is preferable to use a halogen-containing flame retardant, more preferably a bromine-containing flame retardant. Brominated flame retardants include brominated acrylic resins, brominated styrene resins, brominated polycarbonate resins, brominated epoxy resins, brominated polyaryl ether compounds, brominated aromatic imide compounds, brominated bisaryl compounds, Examples thereof include brominated tri (aryloxy) triazine compounds. A bromine-containing epoxy resin is preferable because the rigidity, impact resistance, and fluidity can be improved in a balanced manner.

  As the bromine-containing epoxy resin, a resin whose end is sealed may be used. It is preferable to use a bromine-containing epoxy resin whose ends are sealed because the fluidity of the resin composition at the time of molding becomes high. Of the bromine-containing epoxy resins end-capped, bisphenol A type epoxy resins are particularly preferable. Also, bromophenol is preferably used for end-capping, but tribromophenol is particularly preferably used among bromophenols. The polybutylene terephthalate resin composition may contain a plurality of types of flame retardants.

  When the polybutylene terephthalate resin composition contains a flame retardant, the flame retardant tends to reduce the impact resistance of the resin composition. However, in the present invention, the impact resistance of the resin composition (especially impact resistance at low temperature) is remarkably enhanced by using a specific elastomer and polycarbonate in combination. As a result, the resin composition of the present invention has a very excellent impact resistance while containing a flame retardant.

  The content of the flame retardant in the polybutylene terephthalate resin composition of the present invention is not particularly limited, but is preferably 10% by mass or more and 15% by mass or less. If it is 10 mass% or more, it is preferable for the reason that flame retardance is provided, and if it is 15 mass% or less, it is preferable for the reason that impact resistance is maintained.

  You may contain other components other than the above essential components polybutylene terephthalate, polycarbonate, a core-shell type elastomer, and a flame retardant. Examples of other components include flame retardant aids, anti-dripping agents, stabilizers, antioxidants, antistatic agents, mold release agents, and colorants.

  Although the kind is not specifically limited as a flame retardant adjuvant, When using a bromine containing flame retardant, use of an antimony oxide is preferable, for example. Examples of the antimony oxide include antimony trioxide and antimony pentoxide. Moreover, it is preferable that content of a flame-retardant adjuvant is 2 mass% or more and 10 mass% or less.

  As the dripping inhibitor, for example, a fluorine-containing resin can be used. A tetrafluoroethylene polymer is particularly preferred because of its availability, high effect, and ease of handling. The content of the tetrafluoroethylene polymer is preferably 1% by mass or less.

  The type of the stabilizer is not particularly limited, but for the purpose of suppressing the transesterification of polybutylene terephthalate and polycarbonate, for example, a phosphorus stabilizer can be preferably used. Further, the content of the stabilizer is not particularly limited, but is preferably 0.1% by mass or more and 1.0% by mass or less.

  The type of the antioxidant is not particularly limited, and a preferable one can be used as appropriate. Moreover, it is preferable that content of antioxidant is 0.1 to 1.0 mass%.

<Preparation method of polybutylene terephthalate resin composition>
The specific embodiment of the method for preparing the polybutylene terephthalate resin composition of the present invention is not particularly limited. Generally, the polybutylene terephthalate resin composition is prepared by a facility and method known as a method for preparing the resin composition or its molded body. Can be prepared. For example, necessary components can be mixed and kneaded using a single or twin screw extruder or other melt kneader to prepare pellets for molding. A plurality of extruders or other melt kneaders may be used. The kneading temperature (cylinder temperature) of the resin composition is preferably 250 ° C. or higher and 280 ° C. or lower, more preferably 260 ° C. or higher and 270 ° C. or lower. When the kneading temperature is higher than 280 ° C., the decomposition of the resin tends to proceed during the kneading, and when it is lower than 250 ° C., the dispersion state of each component in the obtained polybutylene terephthalate resin composition may not be excellent.

<Method for producing molded body>
Using the polybutylene terephthalate resin composition of the present invention, a conventionally known molding method (for example, a method such as injection molding, extrusion molding, compression molding, blow molding, vacuum molding, foam molding, rotational molding, gas injection molding, etc.) Various molded bodies can be molded.

  The molded body obtained by the above method is excellent in flame retardancy. Specifically, it satisfies the 5VA standard in the UL combustion test method. In addition, the molded body obtained by the above method has excellent impact resistance at room temperature and low temperature, and also has good tensile characteristics and bending characteristics.

  The resin composition of the present invention is preferable as a raw material for an outdoor electric member used outdoors because a molded product obtained by molding the resin composition has the above properties. Here, the outdoor electrical member refers to a resin component that constitutes a part of an electrical product used outdoors. In many cases, outdoor electric members are required to have flame retardancy, and weather resistance, heat resistance, and impact resistance at room temperature or low temperature are often required.

  Specific examples of the outdoor electric member include a solar cell, an outdoor breaker, an outdoor switch, a connector used in an electric vehicle, or an electronic component casing used in an electric component casing for an electric vehicle.

  Hereinafter, the present invention will be described in more detail by way of examples, but the present invention is not limited thereto.

<Material>
Polybutylene terephthalate resin 1 (PBT1): manufactured by Wintech Polymer Co., Ltd., melt flow rate: 23 g / 10 min
Polybutylene terephthalate resin 2 (PBT2): manufactured by Wintech Polymer Co., Ltd., melt flow rate: 6.5 g / 10 min
Polycarbonate (PC): manufactured by Teijin Chemicals Ltd., “Panlite L-1225”
Elastomer 1 (MBS): Core-shell elastomer with a shell of methacrylate and a core of butadiene styrene (Rohm and Haas Japan, “Paraloid EXL2602”)
Elastomer 2 (acrylic core shell): Core shell elastomer with core layer made of acrylic rubber and shell layer made of vinyl polymer (Rohm and Haas Japan, “Paraloid EXL2314”)
Elastomer 3 (EMA-GMA): ethylene-methyl acrylate-glycidyl methacrylate copolymer (manufactured by Sumitomo Chemical Co., Ltd., “BONDFAST 7M”)
Flame retardant 1: Bromine-containing acrylic resin (IC10 Japan, “FR1025”)
Flame retardant 2: Bromine-containing epoxy resin (ICL Japan, "F3100", with end-capping)
Flame retardant 3: Bromine-containing polycarbonate resin (manufactured by Teijin Chemicals Ltd., “Fireguard 7500”)
Flame retardant aid: Antimony trioxide (Nippon Seiko Co., Ltd., “PATOX-M”)
Anti-dripping agent (PTFE): Polytetrafluoroethylene resin (Asahi Glass Co., Ltd., Fullon CD-076)
Stabilizer 1: Sodium dihydrogen phosphate (Yoneyama Chemical Co., Ltd., “monosodium phosphate”)
Stabilizer 2: Phosphorous stabilizer (manufactured by ADEKA, “ADK STAB PEP36”)
Antioxidant: Hindered phenolic antioxidant (Ciba Japan, “Irganox 1010”)
Mold release agent: Diglycerin fatty acid ester (Riken Vitamin, “Riquemar B100”)

<Production of polybutylene terephthalate resin composition>
The above materials are dry blended in the proportions shown in Table 1 below (unit: mass%), supplied from a hopper to a twin screw extruder (manufactured by Nippon Steel Works, Ltd.) having a 30 mmφ screw, and melted at 260 ° C. The mixture was kneaded to obtain a pellet-shaped polybutylene terephthalate resin composition.

<Evaluation>
The tensile properties, bending properties, impact properties, low temperature impact properties, combustibility, and fluidity were evaluated by the following methods using the test pieces of Examples and the resin compositions of Comparative Examples.

[Tensile properties]
The obtained pellet-shaped resin composition was injection-molded at a molding temperature of 260 ° C. and a mold temperature of 80 ° C. to produce a test piece, and in accordance with ISO 527-1, 2, the tensile strength and tensile elongation were Measurements were made. The measurement results are shown in Table 1.

[Bending characteristics]
The obtained pellet-shaped resin composition was injection-molded at a molding temperature of 260 ° C. and a mold temperature of 80 ° C. to prepare a test piece, and the bending strength and bending elastic modulus were measured according to ISO178. It was. The measurement results are shown in Table 1.

[Impact]
The obtained pellet-shaped resin composition was injection-molded at a molding temperature of 260 ° C. and a mold temperature of 80 ° C. to produce a Charpy impact test piece, and in accordance with the evaluation standard defined in ISO 179 / 1eA, The condition was evaluated. The evaluation results are shown in Table 1.

[Low temperature shock]
This is an evaluation of impact properties performed under the condition of −40 ° C., and was performed in the same manner as the impact properties described above except that it was performed at −40 ° C. The evaluation results are shown in Table 1.

[Combustion quality]
Strip-shaped test pieces (125 × 13 × 1.5 / unit mm) and plate-shaped test pieces (150 × 150 × 1.5 / unit mm) obtained by molding the obtained pellet-shaped resin composition at a molding temperature of 260 ° C. ) Was evaluated by a 5 V test in the UL-94 standard combustion test of Underwriters Laboratories. Standards satisfied (5VA, 5VB, or x (5VA, 5VB is not satisfied)), burning time after ignition of strip-shaped test piece (average value of 5 test pieces, "DRB" is the lower part due to dripping of the burning part ) Indicates whether or not the plate-shaped test piece shows a burn-through hole (“○” indicates no hole, “×” indicates a hole, “−” indicates evaluation of a strip-shaped test piece) Table 1 shows that the plate test piece was not evaluated due to NG.

[Liquidity]
For the pellet-shaped resin composition, melt viscosity was measured at a shear rate of 1000 sec ⁻¹ at a furnace temperature of 260 ° C. and a capillary diameter of 1 mm × 20 mmL in accordance with ISO 11443 using a Capillograph 1B manufactured by Toyo Seiki Seisakusho. . The measurement results are shown in Table 1.

  From the comparison between Examples 1 and 2 and Comparative Examples 1 to 5, and the comparison between Example 3 and Comparative Examples 7 to 8, the core is a styrene butadiene rubber and the shell is an alkyl (meth) acrylate. It was confirmed that it has outstanding flame retardancy, excellent impact resistance at low temperatures, good mechanical properties such as tensile properties and bending properties, and excellent fluidity. . Moreover, the polybutylene terephthalate resin composition of this invention is equipped with favorable moldability from the result of the melt viscosity of Examples 1-3.

  Moreover, from Examples 1-2 and Comparative Example 6, it was confirmed that the specific effects of the present invention were achieved by using a specific amount of a specific core-shell elastomer.

  From Examples 1 to 3, it was confirmed that the combination of the polycarbonate, the specific core-shell elastomer, and the bromine-containing acrylic resin further improved the impact resistance at low temperatures.

  In addition, it was confirmed that mechanical properties, impact resistance, and fluidity can be improved at the same time by combining polycarbonate, a specific core-shell elastomer, and bromine-containing epoxy resin.

  From the results of Example 3 and Comparative Examples 7 to 8, Example 2 and Comparative Example 1 and Comparative Example 3, Comparative Example 2 and Comparative Examples 5 to 6, by using MBS as the elastomer, the polybutylene terephthalate resin composition It was confirmed that the fluidity increased.

Claims (6)

It is a polybutylene terephthalate resin composition for a resin molded body that is an outdoor electric member,
Including polybutylene terephthalate, polycarbonate, core-shell elastomer, and flame retardant,
The polybutylene terephthalate has a melt flow rate of 6 g / 10 min to 50 g / 10 min,
The polycarbonate has a melt flow rate of 3 g / 10 min to 30 g / 10 min,
In the core-shell elastomer, the core is a styrene butadiene rubber, and the shell is an alkyl (meth) acrylate,
A polybutylene terephthalate resin composition, wherein the content of the core-shell elastomer is 5% by mass or more and 20% by mass or less in the entire composition.   2. The polybutylene terephthalate resin composition according to claim 1, wherein a mass ratio of the polybutylene terephthalate and the polycarbonate (content of polybutylene terephthalate / content of polycarbonate) is 6/4 or more and 9/1 or less.   The polybutylene terephthalate resin composition according to claim 1 or 2, wherein a content of the polycarbonate is 10% by mass or more.   The polybutylene terephthalate resin composition according to any one of claims 1 to 3, wherein the flame retardant is a bromine-containing flame retardant. The resin molding containing the polybutylene terephthalate resin composition in any one of Claim 1 to 4. The resin molded body according to claim 5 , wherein the outdoor electric member is a solar cell member, an outdoor breaker, an outdoor switch, an electric vehicle connector, or an electric vehicle electronic component housing.