WO2013061622A1

WO2013061622A1 - Thermoplastic resin composition for insulation components, and insulation component

Info

Publication number: WO2013061622A1
Application number: PCT/JP2012/053185
Authority: WO
Inventors: 伸沢野; 大輔下田
Original assignee: パナソニック株式会社
Priority date: 2011-10-24
Filing date: 2012-02-10
Publication date: 2013-05-02

Abstract

Provided are: a thermoplastic resin composition for insulation components, which is capable of achieving strength characteristic equivalent to or higher than the GWIT 775˚C standard in almost all test piece thicknesses for insulation components without requiring blending of a special ingredient that is a liquid crystalline polymer or use of a glass fiber at high blending ratio, while having good balance among the strength characteristic, tracking resistance and mechanical characteristics; and an insulating component which uses the thermoplastic resin composition for insulation components. The thermoplastic resin composition for insulation components is characterized by containing (A) a polybutylene terephthalate resin, (B) a halogen flame retardant, (C) a flame retardant assistant, (D) a mineral filler having a moisture content of 20% by mass or more and a dehydration initiation temperature of 300˚C or more and (E) a glass fiber-based reinforcing agent, and is also characterized in that the component (B) is contained in an amount of 15-35 parts by mass per 100 parts by mass of the component (A) and the component (D) is contained in an amount of 2-60 parts by mass per 100 parts by mass of the component (A).

Description

Thermoplastic resin composition for insulating parts and insulating parts

The present invention relates to a thermoplastic resin composition for insulating parts and an insulating part using the same.

Polybutylene terephthalate (PBT) resin has excellent mechanical properties, electrical properties, heat resistance, weather resistance, water resistance, chemical resistance and solvent resistance. It is widely used for various applications such as. Numerous technologies have also been developed for improving the flame retardancy.

For example, flame retardant polybutylene terephthalate (PBT) resin can also satisfy the UL-94 standard of Underwriter's Laboratories Inc. at a test piece thickness of 0.3 mm. For this reason, it is widely used for electrical insulation parts such as a relay case which is a thin molded product. In addition, the comparative tracking index (CTI) is improved.

However, the response to the IEC 60695-2 standard of the International Electrotechnical Commission (abbreviated as IEC) is not necessarily sufficiently advanced. Within this standard, insulating material parts used in electrical and electronic equipment are required to be resistant to ignition and flame propagation during operation. In Europe, parts of equipment that operate without an operator, such as white goods, support connections with a rated current exceeding 0.2 A, or are within a distance of 3 mm from these connections The demand for safety of electrical insulation parts is increasing. And it must be satisfied that the ignition temperature (Glow-wire-Ignition Temperature, abbreviation: GWIT) is 775 ° C. or higher in the same standard. Satisfying the GWIT standard for thermoplastic resins is not always easy even for materials having V-0 in the flame retardancy evaluation of the UL-94 standard so far.

So far, thick materials that do not penetrate during contact with glowing heat (glow wire), for example, fiber-reinforced 3 mm thick materials or very thin materials, are being made available for GWIT evaluation. However, it is not easy to satisfy the GWIT 775 ° C. standard for all thicknesses, and it is particularly difficult for a thickness test piece of about 1.5 mm.

Further, as a resin material for insulating parts, in addition to the resistance to the combustion test of GWIT 775 ° C., a material satisfying a good balance in terms of flame retardancy, tracking resistance, and mechanical properties is required. Yes.

As a method for imparting flame retardancy to polybutylene terephthalate (PBT) resin, a halogen-containing flame retardant such as halogenated benzyl acrylate and an inorganic flame retardant aid such as antimony trioxide are added to polybutylene terephthalate (PBT) resin. A composition using a combination and a specific graft copolymer is known (Patent Document 1).

Patent Document 2 discloses an insulating material part having a resin molded part formed using a resin composition in which polybutylene terephthalate (PBT) resin is blended with polyhalogenated benzyl (meth) acrylate and antimony pentoxide. The temperature is improved. However, the resin part of 2 mm or less is intended to improve the GWIT temperature described in the IEC60695-2-13 standard by combining a heat-resistant plate such as metal, and the same as a polybutylene terephthalate (PBT) resin composition alone. It does not satisfy the standard.

On the other hand, as disclosed in Patent Document 3, it is proposed that a polybutylene terephthalate (PBT) resin can meet the standard of GWIT 775 ° C. by blending a liquid crystalline polymer known as a flame retardant means of a thermoplastic resin. There is also.

JP-A-8-109320 JP-A-2005-232410 JP 2008-19400 A

In Patent Document 3, a polybutylene terephthalate (PBT) resin composition is intended to increase the temperature corresponding to the GWIT standard. However, in this polybutylene terephthalate (PBT) resin composition, blending of a liquid crystalline polymer is essential. The liquid crystalline polymer has a relatively high melting point, and it is not always easy to handle the preparation of the composition. Moreover, it becomes a factor of high cost. And in order to raise the compatibility with a GWIT flame-retardant test, it is necessary to raise the compounding ratio of glass fiber, and this has the problem that a moldability may be restrict | limited.

From the background as described above, the present invention requires almost all tests for insulating parts without the need for blending a specific component called a liquid crystalline polymer in Patent Document 3 or using glass fibers at a high blending ratio. To provide a thermoplastic resin composition for insulating parts that can achieve strength characteristics equivalent to or better than the GWIT 775 ° C standard in one thickness, and has a good balance between tracking resistance and mechanical characteristics, and insulating parts using the same. Is an issue.

In order to solve the above problems, the thermoplastic resin composition for insulating parts of the present invention comprises (A) a polybutylene terephthalate resin (a1) alone or a polybutylene terephthalate resin (a1) and a polyethylene terephthalate resin (a2). Polybutylene terephthalate resin comprising both, (B) halogen flame retardant, (C) flame retardant auxiliary, (D) moisture content is 20% by mass or more, and dehydration start temperature is 300 ° C. or more. A mineral filler and (E) a glass fiber reinforcing agent, and (B) a halogen-based flame retardant content is 15 to 35 parts by mass with respect to 100 parts by mass of (A) polybutylene terephthalate resin, (D) The content of the mineral filler is 2 to 60 parts by mass with respect to 100 parts by mass of the (A) polybutylene terephthalate resin.

In this thermoplastic resin composition for insulating parts, the mass ratio of the polybutylene terephthalate resin (a1) to the polyethylene terephthalate resin (a2) is 95/5 to 60/40 as (a1) / (a2). preferable.

In this thermoplastic resin composition for insulating parts, (B) the halogen flame retardant is at least selected from a halogenated epoxy resin, a halogenated aromatic bisimide compound, a halogenated benzyl acrylate, a halogenated polystyrene, and a halogenated phenylethane. One type is preferable.

In this thermoplastic resin composition for insulating parts, it is preferable that the flame retardant aid (C) contains melamine cyanurate and antimony oxide.

In this thermoplastic resin composition for insulating parts, the content of melamine cyanurate is 15 to 50 parts by mass with respect to 100 parts by mass of (A) polybutylene terephthalate resin, and the mass ratio of antimony oxide to melamine cyanurate is It is preferably 0.05 to 0.85.

In this thermoplastic resin composition for insulating parts, (D) the mineral filler is preferably colemanite.

In this thermoplastic resin composition for insulating parts, the content of (E) glass fiber reinforcing agent is preferably 10 to 100 parts by mass with respect to 100 parts by mass of (A) polybutylene terephthalate resin.

In this thermoplastic resin composition for insulating parts, it is preferable that the red-hot rod ignition temperature of 775 ° C. or higher described in IEC60695-2-13 is satisfied for any of the test piece thicknesses of 0.75 mm, 1.5 mm, and 3 mm.

The insulating component of the present invention is characterized in that at least a part thereof is constituted by the above thermoplastic resin composition for insulating components.

According to the thermoplastic resin composition for insulating parts of the present invention and the insulating parts using the same, insulation without requiring the use of a specific component such as a liquid crystalline polymer or the use of glass fiber at a high mixing ratio. It is possible to realize strength characteristics equivalent to or higher than those of the GWIT 775 ° C. standard for almost all test specimen thicknesses for parts, and a good balance between tracking resistance and mechanical characteristics.

Particularly in the present invention, the mixing of the component (D) mineral filler makes it difficult for the test piece to ignite when a 750 ° C. red hot rod is pressed against the test piece, even in the case of a 1.5 mm test piece.

Hereinafter, the present invention will be described in detail.

Polybutylene terephthalate (PBT) resin as the essential component (a1) in the thermoplastic resin composition for insulating parts of the present invention (hereinafter referred to as PBT resin). ] Is a thermoplastic resin obtained by polycondensation of terephthalic acid or its ester-forming derivative and C 4 alkylene glycol (1,4-butanediol) or its ester-forming derivative.

The PBT resin may be a copolymer containing 70% by mass or more of a butylene terephthalate repeating unit. In this case, as dibasic acid components other than terephthalic acid or ester-forming derivatives thereof (lower alcohol ester, etc.), aliphatics such as isophthalic acid, naphthalenedicarboxylic acid, adipic acid, sebacic acid, trimellitic acid, succinic acid, Aromatic polybasic acids or ester-forming derivatives thereof. Examples of glycol components other than 1,4-butanediol include ordinary alkylene glycols such as ethylene glycol, diethylene glycol, propylene glycol, trimethylene glycol, hexamethylene glycol, neopentyl glycol, cyclohexanedimethanol, and 1,3-octane. Lower alkylene glycol such as diol, aromatic alcohol such as bisphenol A, 4,4′-dihydroxybiphenyl, alkylene oxide adduct alcohol such as ethylene oxide 2 mol adduct of bisphenol A, propylene oxide 3 mol adduct of bisphenol A, Examples thereof include polyhydroxy compounds such as glycerin and pentaerythritol or ester-forming derivatives thereof.

In the present invention, any PBT resin obtained by polycondensation using the above compound as a monomer component can be used as the component (a1) of the present invention, and can be used alone or in admixture of two or more.

In the present invention, a branched polymer belonging to a copolymer can also be used as the PBT resin. The PBT resin branched polymer referred to here is a polyester having a so-called PBT resin or butylene terephthalate monomer as a main component and branched by adding a polyfunctional compound. Examples of the polyfunctional compound that can be used here include trimesic acid, trimellitic acid, pyromellitic acid and alcohol esters thereof, glycerin, trimethylolethane, trimethylolpropane, and pentaerythritol.

In the present invention, polyethylene terephthalate (PET) resin [hereinafter referred to as PET resin] together with the PBT resin. ] May be used in combination. The PET resin is a thermoplastic resin obtained by polycondensation of terephthalic acid or its ester-forming derivative and ethylene glycol or its ester-forming derivative.

The PET resin may be a copolymer containing 90% by mass or more of ethylene terephthalate repeating units. In this case, dibasic acid components and copolymers other than terephthalic acid or ester-forming derivatives thereof may be considered in the same manner as in the case of the PBT resin.

In the present invention, the PBT resin (a1) is essential. When the PET resin (a2) is used in combination, the blending mass ratio is preferably 95/5 to 60/40 as (a1) / (a2).

When PET resin (a2) is used in combination, the amount of halogenated flame retardant used can be reduced as the ratio increases. However, when the ratio of the PET resin (a2) is higher than 40/60 as (a2) / (a1), in the case of a thin molded product such as a relay case, the crystallinity of the resin composition is lowered and the moldability is reduced. It tends to decrease. For this reason, it may be necessary to increase the mold temperature or extend the mold holding time.

The combined use of the PBT resin (a1) and the PET resin (a2) may be mixed as separate raw materials, or both may be integrated as a copolymer.

(B) The halogen-based flame retardant may be of various types including those conventionally known. Among these, it is preferable to use at least one selected from a halogenated epoxy resin, a halogenated aromatic bisimide compound, a halogenated benzyl acrylate, a halogenated polystyrene, and a halogenated phenyl eta.

“Halogen” in these cases is preferably chlorine or bromine.

More specifically, preferable examples include TBBPA diglycidyl ether copolymer, polypentabromobenzyl acrylate, brominated polystyrene, pentabromophenyl ethane and the like.

(B) The addition amount of the halogen-based flame retardant is 15 to 35 parts by mass, preferably 20 to 30 parts by mass with respect to 100 parts by mass of the (A) polybutylene terephthalate resin. (B) When the addition amount of the halogen-based flame retardant is 15 parts by mass or more, sufficient flame retardancy can be obtained, and when it is 35 parts by mass or less, deterioration of mechanical properties can be suppressed.

(C) As the flame retardant aid, antimony compounds such as antimony trioxide and antimony pentoxide, and melamine cyanurate, which are known to have a synergistic effect of flame retardancy when used in combination with (B) a halogen flame retardant, can be used. . In addition, silicates such as talc and mica, calcium carbonate, magnesium hydroxide, boehmite, zinc sulfate, zinc oxide and the like can be used.

(C) The addition amount of the flame retardant aid is preferably 20 to 60 parts by mass with respect to 100 parts by mass of (A) polybutylene terephthalate resin. (C) When the flame retardant aid is used in an addition amount of 20 parts by mass or more, the effect as a flame retardant aid is exhibited, and when it is used in an addition amount of 60 parts by mass or less, a decrease in mechanical strength can be suppressed.

(C) The flame retardant aid is preferably antimony oxide or melamine cyanurate among those exemplified above. In particular, the combined use of antimony oxide and melamine cyanurate can have a great effect on flame retardancy. Combustibility is often accelerated by the combustible gas generated from the test piece when the red hot rod is pressed against the test piece, but the nitrogen gas generated from melamine cyanurate greatly contributes to suppression of combustibility. Conceivable. That is, by adding melamine cyanurate, sublimation and endotherm occur, and there is a great effect in suppressing combustion when a 750 ° C. red hot rod is pressed.

In the combined use of antimony oxide and melamine cyanurate, the content of melamine cyanurate is preferably 15 to 50 parts by mass with respect to 100 parts by mass of (A) polybutylene terephthalate resin. In addition, the mass ratio of antimony oxide to melamine cyanurate is preferably 0.05 to 0.85, and more preferably 0.05 to 0.35. When the content of melamine cyanurate is within this range, a sublimation / endothermic effect can be obtained, and when the mass ratio of antimony oxide to melamine cyanurate is within this range, mechanical properties and fluidity are also reduced. Can be suppressed.

Note that the blending amounts of the (B) halogen flame retardant and (C) flame retardant aid are considered so that the flame retardancy of the 0.3 mm-thick specimen can satisfy UL-94 V-0.

(D) The mineral filler is characterized by having a water content of 20% by mass or more and a dehydration start temperature of 300 ° C. or more. By the addition of the mineral filler (D), dehydration and endothermic reaction occur, and the test piece is less likely to ignite when the 750 ° C. red hot rod is pressed against the test piece. This is particularly effective for 1.5 mm and 3.0 mm thick test pieces.

As such (D) mineral filler, a typical example is colemanite. Colemanite is a mineral of hydrous calcium borate, and it is called a boehmite.

(D) The average particle diameter of the mineral filler is not particularly limited, but is usually 100 μm or less, preferably 1 to 50 μm. In addition, an average particle diameter can be measured using a laser diffraction scattering type particle size distribution measuring apparatus, for example. The average particle diameter is a value derived by measurement using a sample arbitrarily extracted from the population and using the measurement apparatus.

The blending amount is in the range of 2 to 60 parts by weight, preferably 2 to 25 parts by weight, more preferably 5 to 25 parts by weight with respect to 100 parts by weight of the (A) polybutylene terephthalate resin. In order to obtain a dehydration / endothermic effect, it is necessary to add 2 parts by mass or more. On the other hand, it is necessary to add in the range of 60 parts by mass or less in order to ensure mechanical properties and suppress a decrease in flame retardancy due to dripping during combustion.

(E) The average fiber diameter of the glass fiber reinforcing agent is not particularly limited, and is, for example, 1 to 100 μm, preferably 1 to 50 μm, more preferably about 3 to 30 μm. Also, the average fiber length is not particularly limited and is, for example, about 0.1 to 20 mm.

(E) The addition amount of the glass fiber reinforcing agent may be determined in accordance with the required level of rigidity and dimensional stability. The amount is preferably 10 to 100 parts by mass, and more preferably 30 to 60 parts by mass with respect to 100 parts by mass of the (A) polybutylene terephthalate resin. By making the addition amount 10 parts by mass or more, rigidity and dimensional stability can be improved. By making the addition amount 100 parts by mass or less, it is possible to suppress a decrease in melt-kneading property and moldability.

(E) The glass fiber reinforcing agent may be surface-treated with a sizing agent or a surface treatment agent (for example, a functional compound such as an epoxy compound, an isocyanate compound, a silane compound, or a titanate compound) as necessary. (E) The glass fiber reinforcing agent may be surface-treated in advance with the sizing agent or surface treatment agent, or may be surface-treated by adding a sizing agent or surface treatment agent during the preparation of the resin composition. .

In the thermoplastic resin composition for insulating parts of the present invention, when it is required that the flame retardant classification “V-0” of UL standard 94 is used depending on the use of the molded product, dripping prevention of fluorine-based resin, etc. Preferably, the agent is used with a flame retardant.

Fluorine-based resins include tetrafluoroethylene (PTFE), chlorotrifluoroethylene, vinylidene fluoride, hexafluoropropylene, perfluoroalkyl vinyl ether and other fluorine-containing monomers alone or copolymers, the fluorine-containing monomers and ethylene, Examples thereof include copolymers with copolymerizable monomers such as propylene and (meth) acrylate.

The amount of fluorine resin added is, for example, 0 to 10 parts by weight, preferably 0.1 to 5 parts by weight, more preferably 0.2 to 1 part by weight based on 100 parts by weight of the (A) polybutylene terephthalate resin. .5 parts by mass.

Furthermore, in the thermoplastic resin composition for insulating parts of the present invention, if necessary, conventional additives such as antioxidants, ultraviolet absorbers, heat stabilizers, stabilizers such as weather stabilizers, lubricants, A mold release agent, a colorant, a nucleating agent, a crystallization accelerator and the like may be added. Further, other thermoplastic resins (for example, polyamide, acrylic resin, etc.) and thermosetting resins (for example, unsaturated PBT resin, phenol resin, epoxy resin, etc.) may be added.

In the thermoplastic resin composition for insulating parts of the present invention containing the components as described above, the test piece has a thickness of 0.3 mm, corresponds to UL94 V-0 in the flammability test, and the thickness of the test piece is 0.75 mm. It is preferable that GWIT can substantially satisfy the condition of 775 ° C. or higher at both 1.5 mm and 3.0 mm.

In GWIT, when a hot rod is pressed against a test piece, it penetrates immediately at 0.75 mm, so combustion and ignition are relatively difficult to occur. Is unlikely to occur. In comparison with this, in the case of 1.5 mm, combustion / ignition tends to occur, but according to the thermoplastic resin composition for insulating parts of the present invention, any of thicknesses of 0.75 mm, 1.5 mm, and 3.0 mm In addition, combustion and ignition can be suppressed even if a hot rod is pressed against the test piece.

Such a thermoplastic resin composition for insulating parts of the present invention may be a powder mixture or a molten mixture, and can be prepared by mixing by a conventional method. For example, each component can be mixed, kneaded by a single-screw or twin-screw extruder, and extruded to prepare a pellet.

The insulating component of the present invention can be obtained by performing known molding such as injection molding using the thermoplastic resin composition for insulating component prepared as described above. Examples of the insulating parts include those used for automobile parts, electric / electronic parts, and the like, and the electric / electronic parts are also suitable for thin molded products such as switches and relay cases.

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

<Preparation of composition>
The blending materials of Examples and Comparative Examples shown in Table 1 of the attached table were blended with the glass fibers removed, and mixed for 30 minutes with a blender for homogenization.

The mixture was kneaded and melted with a twin-screw extruder heated to 260 ° C., glass fibers were added at a predetermined ratio to the melted portion, and kneading and melting were further performed.

In addition, some mineral fillers (colemanite) were supplied from the root of the kneading machine using a separate supply feeder. Thereafter, it was cooled in 50 ° C. water and cut into 2 to 4 mm with a pelletizer to obtain a pellet-like material.

About the compounding material, the following were used.
[(A1) PBT resin]
・ Commercially available PBT resin
[(A2) PET resin]
・ Commercially available PET resin
[(B) Halogen flame retardant]
-Brominated epoxy resin: Sakamoto Yakuhin SR T20000
・ 1,2-Bis-pentabromophenylethane: Albemarle SAYTEX8010
Polypentabromobenzyl acrylate: Dead Sea Bromine GrFR1025
[(C) Flame retardant aid]
Melamine cyanurate: Nissan Chemical MC4500
・ Antimony trioxide
[(D) Mineral filler]
・ Colemanite: Kinsei Matec UB Powder
[(E) Glass fiber reinforcement]
・ Glass fiber (average fiber diameter 13μm, average fiber length 3.0mm)
[Additive]
・ Talc ・ Montanic acid ester: Clariant WAX-E
・ Tetrafluoroethylene (PTFE)

<Preparation of test piece>
The molding material composed of the composition shown in Table 1 was pre-dried at 140 ° C. for 4 hours in a thermostatic bath, so that the moisture content in the molding material was 0.02% or less. Thereafter, a test piece was obtained by injection molding with a 100 t injection molding machine.

The conditions at that time are a cylinder temperature of 260 ° C. (near the head) and 200 ° C. (material input port), and the mold temperature varies depending on the TP.

Test pieces:
1) 0.3 mm dumbbell test piece: A 0.8 mm molded product was molded at a mold temperature of 80 ° C. and polished.
2) 0.75 mm test piece: produced at a mold temperature of 80 ° C.
3) 1.5 mm test piece: produced at a mold temperature of 80 ° C.
4) 3.0 mm test piece: produced at a mold temperature of 80 ° C.
5) Tracking test piece: The above dumbbell was used.

<Evaluation method and evaluation results>
The following evaluation was performed about each test piece.

◆ Tensile / bending strength measurement: According to ISO.

◆ Tracking resistance: Conforms to IEC standards.

◆ GWIT: Conforms to IEC standards.

♦ Ignition during GWIT measurement: The presence or absence of ignition was confirmed using a 0.3 mm dumbbell test piece.

The evaluation results are shown in Table 1.

As is clear from the comparison between Examples 1 to 7 and Comparative Examples 1 and 2, in Examples 1 to 7 in which the mineral filler colemanite is blended, the GWIT775 standard or higher is realized in almost all test specimen thicknesses. Yes. On the other hand, it can be seen that Comparative Examples 1 and 2 are significantly inferior.

It can also be seen that the combined use of melamine cyanurate and antimony oxide as a flame retardant aid is effective. In particular, the content of melamine cyanurate is 15 to 50 parts by mass with respect to 100 parts by mass of the polybutylene terephthalate resin, and the mass ratio of antimony oxide to melamine cyanurate is in the range of 0.05 to 0.85. In Examples 1 to 6, the test piece thickness of 0.75 mm, 1.5 mm, and 3.0 mm achieved the GWIT775 standard or higher. In Example 7, the GWIT showed a clear improvement compared with the comparative example and obtained an excellent result. However, compared with Examples 1 to 6, the GWIT slightly decreased when the specimen thickness was 1.5 mm.

Claims

(A) Polybutylene terephthalate resin (a1) alone or polybutylene terephthalate resin comprising both polybutylene terephthalate resin (a1) and polyethylene terephthalate resin (a2), (B) halogen flame retardant, (C) flame retardant An auxiliary, (D) a mineral filler having a water content of 20% by mass or more and a dehydration start temperature of 300 ° C. or higher, and (E) a glass fiber reinforcing agent, and the (B) halogen-based The flame retardant content is 15 to 35 parts by mass with respect to 100 parts by mass of the (A) polybutylene terephthalate resin, and the (D) mineral filler content is 100 parts by mass of the (A) polybutylene terephthalate resin. 2. A thermoplastic resin composition for insulating parts, characterized by being 2 to 60 parts by mass.
The mass ratio of the polybutylene terephthalate resin (a1) and the polyethylene terephthalate resin (a2) is 95/5 to 60/40 as (a1) / (a2). Thermoplastic resin composition for insulating parts.
The (B) halogen-based flame retardant is at least one selected from a halogenated epoxy resin, a halogenated aromatic bisimide compound, a halogenated benzyl acrylate, a halogenated polystyrene, and a halogenated phenylethane. Item 3. The thermoplastic resin composition for insulating parts according to item 1 or 2.
The thermoplastic resin composition for insulating parts according to any one of claims 1 to 3, wherein the flame retardant aid (C) contains melamine cyanurate and antimony oxide.
The content of the melamine cyanurate is 15 to 50 parts by mass with respect to 100 parts by mass of the (A) polybutylene terephthalate resin, and the mass ratio of the antimony oxide to the melamine cyanurate is 0.05 to 0.85. The thermoplastic resin composition for insulating parts according to claim 4, wherein:
The thermoplastic resin composition for insulating parts according to any one of claims 1 to 5, wherein the mineral filler (D) is colemanite.
The content of the (E) glass fiber reinforcing agent is 10 to 100 parts by mass with respect to 100 parts by mass of the (A) polybutylene terephthalate resin, according to any one of claims 1 to 6. The thermoplastic resin composition for insulating parts as described.
The test piece thickness of 0.75 mm, 1.5 mm, or 3 mm satisfies the condition of the red hot rod ignition temperature of 775 ° C. or more described in IEC60695-2-13. The thermoplastic resin composition for insulating parts as described in 2.
An insulating part, wherein at least a part thereof is constituted by the thermoplastic resin composition for insulating parts according to any one of claims 1 to 8.