Thermoplastic resin composition and parts, and method for manufacturing parts and method for improving mechanical strength of parts made of thermoplastic resin composition

Abstract

The present invention is a thermoplastic resin composition obtained by melt-kneading at least 0.1 to 0.5 parts by mass of a carbon nanostructure in 100 parts by mass of a thermoplastic resin; a member formed by molding the thermoplastic resin composition; a method for manufacturing a member, which includes a step of preparing the thermoplastic resin composition and a step of molding the thermoplastic resin composition into a prescribed shape; and a method for improving the mechanical strength of a member composed of a thermoplastic resin composition obtained by melt-kneading 0.1 to 0.5 parts by mass of a carbon nanostructure in 100 parts by mass of a thermoplastic resin.

Description

TECHNICAL FIELD

[0001] The present application relates to a thermoplastic resin composition and a molded part thereof, and a manufacturing method and a mechanical strength improvement method of a part composed of a thermoplastic resin composition. BACKGROUND

[0002] Since various thermoplastic resins such as polyoxymethylene resin, polyarylene sulfide resin, polybutylene terephthalate resin, polyethylene terephthalate resin, and polyamide resin are excellent in various physical and mechanical properties, drug resistance, and the like, they are utilized in various fields as engineering plastics. In the thermoplastic resins, various additives are generally added with the aim of improving the performance such as mechanical properties (see Patent Literature 1). As such additives, various fillers such as fibrous fillers such as glass fibers, plate-like fillers such as glass flakes and talc, and spherical fillers such as glass beads can be exemplified.

[0003] PRIOR ART DOCUMENTS

[0004] PATENT LITERATURE

[0005] Patent Literature 1: Japanese Patent Application Laid-Open No. 2008-144002 SUMMARY

[0006] PROBLEMS TO BE SOLVED BY THE INVENTION

[0007] However, in the case where the above-described fillers are added to improve the mechanical strength and the elastic modulus, it is necessary to add the fillers in an amount of at least a certain amount in the thermoplastic resin, and as a result, the tensile elongation at break and the impact resistance are decreased.

[0008] The present application has been achieved in view of the above-described problems of the related art, and aims to provide a thermoplastic resin composition and a part which can achieve an improvement in mechanical properties without greatly impairing the tensile elongation at break and the impact resistance, and a manufacturing method and a mechanical strength improvement method of a part composed of a thermoplastic resin composition.

[0009] MEANS FOR SOLVING THE PROBLEMS

[0010] The present application has found that an improvement in mechanical strength can be achieved without greatly impairing the tensile elongation at break and the impact resistance by adding only a small amount of carbon nanostructure to a thermoplastic resin.

[0011] One embodiment of the present application for solving the above-described problems is as follows.

[0012] (1) A thermoplastic resin composition obtained by melt-kneading at least 0.1 to 0.5 parts by mass of carbon nanostructure in 100 parts by mass of a thermoplastic resin.

[0013] (2) The thermoplastic resin composition mentioned in (1) above is a thermoplastic resin selected from the group consisting of polyoxymethylene resin, polyarylate sulfide resin, polybutylene terephthalate resin, polyethylene terephthalate resin and polyamide resin.

[0014] (3) A component formed by molding the thermoplastic resin composition described in (1) or (2) above.

[0015] (4) A method for manufacturing a component, comprising:

[0016] A step for preparing a thermoplastic resin composition, said thermoplastic resin composition being obtained by melt-blending at least 0.1 to 0.5 parts by mass of carbon nanostructures into 100 parts by mass of a thermoplastic resin; and

[0017] A process for molding the thermoplastic resin composition into a specified shape.

[0018] (5) A method for improving the mechanical strength of a component made of a thermoplastic resin composition, wherein the thermoplastic resin composition is a resin composition obtained by melt-blending 0.1 to 0.5 parts by mass of carbon nanostructures in 100 parts by mass of a thermoplastic resin.

[0019] Invention Effects

[0020] According to the present invention, it is possible to provide thermoplastic resin compositions and components that can achieve improved mechanical properties without significantly impairing tensile elongation at break and impact resistance, as well as methods for manufacturing components made of thermoplastic resin compositions and methods for improving mechanical strength. Detailed Implementation

[0021] <Thermoplastic Resin Composition>

[0022] The thermoplastic resin composition of this embodiment is characterized by being obtained by melt-blending at least 0.1 to 0.5 parts by mass of carbon nanostructures (hereinafter also referred to as "CNS") into 100 parts by mass of thermoplastic resin.

[0023] The components of the thermoplastic resin composition of this embodiment will be described below.

[0024] [Thermoplastic resin]

[0025] In this embodiment, examples of crystalline thermoplastic resins that are thermoplastic resins include polyoxymethylene resin (hereinafter also referred to as "POM resin"), polyaryl sulfide resin (hereinafter also referred to as "PAS resin"), polybutylene terephthalate resin (hereinafter also referred to as "PBT resin"), polyethylene terephthalate resin, polyamide resin, etc.

[0026] The thermoplastic resin is preferably selected from the group consisting of polyoxymethylene resin, polyaryl sulfide resin, polybutylene terephthalate resin, polyethylene terephthalate resin, and polyamide resin. Hereinafter, POM resin, PAS resin, and PBT resin are listed as thermoplastic resins for description, but this embodiment is not limited to these.

[0027] (Polyoxymethylene resin (POM resin))

[0028] POM resin is a polymer compound with oxymethylene (-CH2O-) as the main structural unit. It can be a homopolymer of polyoxymethylene, a copolymer of polyoxymethylene, or any of these. Polyoxymethylene copolymers have oxymethylene as the main repeating unit, and also contain small amounts of other structural units, such as comonomers of ethylene oxide, 1,3-dioxocyclopentane, and 1,4-butanediol formaldehyde. In addition, terpolymers and block polymers also exist as polymers, but any of these can also be present. Furthermore, the molecules of POM resin are not only linear, but can also have branched or cross-linked structures, and can be known modified polyoxymethylene resins with the introduction of other organic groups. Moreover, there are no particular restrictions on the degree of polymerization of POM resin, as long as it has melt-forming processability (e.g., a melt flow rate (MFR) of 1.0 g / 10 min or more and 100 g / 10 min or less, measured at 190°C and a load of 2160 g according to ISO 1133).

[0029] POM resin can be manufactured using well-known manufacturing methods.

[0030] (Polybutylene terephthalate resin (PBT resin))

[0031] PBT resin is a resin containing at least terephthalic acid or its ester-forming derivatives (C 1-6 PBT resin is a resin obtained by polycondensation of a dicarboxylic acid component (such as alkyl esters or acid halides) with a diol component containing at least four carbon atoms (1,4-butanediol) or its ester-forming derivatives (acetylates, etc.). PBT resin is not limited to homopolymer polybutylene terephthalate, but can also be a copolymer containing 60 mol% or more (especially 75 mol% or more and 95 mol% or less) of butylene terephthalate units.

[0032] The amount of terminal carboxyl groups in the PBT resin is not particularly limited as long as it does not impair the effect of the thermoplastic resin in this embodiment. The amount of terminal carboxyl groups in the PBT resin is preferably 30 meq / kg or less, and more preferably 25 meq / kg or less.

[0033] The intrinsic viscosity (IV) of the PBT resin is preferably 0.65 to 1.20 dL / g. When using PBT resin with an intrinsic viscosity within this range, the resulting resin composition exhibits particularly excellent mechanical properties and flowability. Conversely, excellent mechanical properties cannot be obtained when the intrinsic viscosity is less than 0.65 dL / g, and excellent flowability is sometimes not obtained when it exceeds 1.20 dL / g.

[0034] Furthermore, PBT resins with intrinsic viscosities within the aforementioned range can also be mixed with PBT resins having different intrinsic viscosities to adjust the intrinsic viscosity. For example, by mixing PBT resins with intrinsic viscosities of 0.9 dL / g and 0.7 dL / g, a PBT resin with an intrinsic viscosity of 0.8 dL / g can be prepared. The intrinsic viscosity (IV) of the PBT resin can be measured, for example, in o-chlorophenol at a temperature of 35°C.

[0035] In PBT resin, 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, and 4,4'-diphenyl ether dicarboxylic acid. 8-14 Aromatic dicarboxylic acids; C-type of succinic acid, adipic acid, azelaic acid, sebacic acid, etc. 4-16 alkyl dicarboxylic acids; cyclohexane dicarboxylic acids, etc., C 5-10 Cycloalkanes dicarboxylic acids; ester-forming derivatives of these dicarboxylic acid components (C 1-6 Alkyl ester derivatives, acidic halides, etc.). These dicarboxylic acid components can be used alone or in combination of two or more.

[0036] Among these dicarboxylic acid components, isophthalic acid and other C-type dicarboxylic acids are preferred. 8-12 Aromatic dicarboxylic acids, as well as adipic acid, azelaic acid, sebacic acid, etc., C 6-12 Alkyl dicarboxylic acid.

[0037] In PBT resin, diol components (comonomer components) other than 1,4-butanediol can include, for example, ethylene glycol, propylene glycol, 1,3-propanediol (trimethylene glycol), 1,3-butanediol, 1,6-hexanediol, neopentyl glycol, 1,3-octanediol, etc. 2-10 Alkylene glycols; polyoxyalkylene glycols such as diethylene glycol, triethylene glycol, and dipropylene glycol; alicyclic glycols such as cyclohexanediol and hydrogenated bisphenol A; aromatic glycols such as bisphenol A and 4,4'-dihydroxybiphenyl; 2-molar adducts of bisphenol A in ethylene oxide and 3-molar adducts of bisphenol A in propylene oxide, etc.; C64 of bisphenol A. 2-4These are alkylene oxide adducts; or ester-forming derivatives of these diols (acetylations, etc.). These diol components can be used alone or in combination of two or more.

[0038] Among these diol components, ethylene glycol, 1,3-propanediol, and other C-type diols are preferred. 2-6 Alkylene glycols, diethylene glycol, and other polyoxyalkylene glycols, or alicyclic glycols such as cyclohexanediol.

[0039] Comonomers that can be used in addition to dicarboxylic acid and diol components include, for example, aromatic hydroxycarboxylic acids such as 4-hydroxybenzoic acid, 3-hydroxybenzoic acid, 6-hydroxy-2-naphthoic acid, and 4-carboxy-4'-hydroxybiphenyl; aliphatic hydroxycarboxylic acids such as glycolic acid and hydroxyhexanoic acid; and C-type comonomers such as propiolactone, butyrolactone, valproic acid, and caprolactone (ε-caprolactone, etc.). 3-12 lactones; ester-forming derivatives of these comonomer components (C 1-6 Alkyl ester derivatives, acid halides, acetylates, etc.

[0040] (Polyaryl sulfide resin (PAS resin))

[0041] PAS resin is characterized by its excellent mechanical, electrical, heat resistance, and other physical / chemical properties, as well as good processability.

[0042] PAS resin is a polymeric compound mainly composed of -(Ar-S)- (but Ar is arylene) as repeating units. In this embodiment, PAS resin with a commonly known molecular structure can be used.

[0043] Examples of the aforementioned arylene groups include p-phenylene, m-phenylene, o-phenylene, substituted phenylene, p,p'-diphenylene sulfone group, p,p'-biphenylene, p,p'-diphenylene ether group, p,p'-diphenylene carbonyl group, and naphthyl group. The PAS resin can be a homopolymer composed solely of the aforementioned repeating units, but sometimes, from the perspective of processability, copolymers comprising different types of repeating units are preferred.

[0044] As a homopolymer, a polyphenylene sulfide resin (hereinafter also referred to as "PPS resin") using p-phenylene groups as repeating units, with p-phenylene sulfide groups as arylene groups, is preferably used. Furthermore, as a copolymer, two or more combinations of different aryl sulfide groups composed of the aforementioned arylene groups can be used, but combinations containing both p-phenylene sulfide groups and m-phenylene sulfide groups are particularly preferred. Copolymers containing 70 mol% or more, preferably 80 mol% or more of p-phenylene sulfide groups are suitable from the perspective of heat resistance, moldability, mechanical properties, and other physical properties. Moreover, among these PAS resins, high molecular weight polymers with a substantially linear structure obtained by condensation polymerization of monomers mainly composed of difunctional halogenated aromatic compounds are particularly preferred. Additionally, the PAS resin used in this embodiment can also be a mixture of two or more different types of PAS resins with varying molecular weights.

[0045] In addition to linear PAS resins, other examples include polymers that partially form branched or cross-linked structures by using a small amount of monomers such as polyhalogenated aromatic compounds with three or more halogen substituents during polycondensation, and polymers with low molecular weight linear structures that improve their molding processability by heating at high temperatures in the presence of oxygen or the like and increasing their melt viscosity through oxidative or thermal cross-linking.

[0046] The melt viscosity of the PAS resin used as the matrix resin in this embodiment (310°C, shear rate 1200 sec) is... -1 Including the above-mentioned mixed systems, a Pa·s of 5 to 500 Pa is preferred.

[0047] [Carbon nanostructures (CNS)]

[0048] In the thermoplastic resin composition of this embodiment, a predetermined amount of CNS is added to the thermoplastic resin, and the mechanical properties are improved by utilizing the nucleating agent effect of the CNS. More specifically, it is believed that by adding a predetermined amount of CNS to the thermoplastic resin, the CNS acts as a nucleating agent, and the mechanical properties are improved by utilizing this nucleating agent effect. Moreover, since the nucleating agent effect is achieved by a trace amount of CNS, the mechanical strength can be improved by the aforementioned trace amount of CNS. In addition, in this embodiment, "nucleating agent" has the same meaning as "crystallization nucleating agent" or "nucleating agent".

[0049] The CNS used in this embodiment is a structure containing multiple carbon nanotubes in a bonded state, where the carbon nanotubes are bonded to other carbon nanotubes through branching bonds and cross-linking structures. Detailed descriptions of such CNSs are described in U.S. Patent Application Publication No. 2013-0071565, U.S. Patent No. 9,113,031, U.S. Patent No. 9,447,259, and U.S. Patent No. 9,111,658.

[0050] The CNS used in this embodiment can be a commercially available product. For example, CABOT's ATHLOS 200, ATHLOS 100, etc., can be used.

[0051] In the thermoplastic resin composition of this embodiment, the method of adding CNS to the thermoplastic resin is not particularly limited, and can be carried out using existing known methods.

[0052] In the thermoplastic resin composition of this embodiment, 0.1 to 0.5 parts by weight of CNS are contained in 100 parts by weight of thermoplastic resin. When the content of CNS is less than 0.1 parts by weight, the mechanical strength is poor; when it exceeds 0.5 parts by weight, the elongation at break decreases significantly. The content of CNS is preferably 0.1 to 0.4 parts by weight, and more preferably 0.1 to 0.3 parts by weight.

[0053] In this embodiment, nucleating agents can also be used together as long as they do not impair the effect. Examples of nucleating agents include carbon black, calcium carbonate, mica, talc, kaolin, titanium dioxide, alumina, calcium silicate, boron nitride, and ammonium chloride.

[0054] [Other ingredients]

[0055] Various stabilizers selected as needed may also be mixed into the thermoplastic resin composition of this embodiment. Examples of stabilizers used herein include any one or more hindered phenolic compounds, nitrogen-containing compounds, hydroxides of alkalis or alkaline earth metals, inorganic salts, carboxylates, etc. Furthermore, as long as the aforementioned effects are not impaired, one or more common additives relative to thermoplastic resins may be added as needed, such as colorants like dyes and pigments, lubricants, release agents, antistatic agents, surfactants, flame retardants, or organic polymer materials, inorganic or organic fibrous, powder, or plate-like fillers, etc.

[0056] There are no particular limitations on the method for producing molded articles using the thermoplastic resin composition of this embodiment, and known methods can be used. For example, the article can be produced by feeding the thermoplastic resin composition of this embodiment into an extruder for melt mixing to form granules, and then feeding the granules into an injection molding machine equipped with a predetermined mold for injection molding.

[0057] <Components>

[0058] The component of this embodiment is formed by molding the thermoplastic resin composition of this embodiment described above. Therefore, the component of this embodiment has the same high mechanical strength as the thermoplastic resin composition of this embodiment.

[0059] The component described in this embodiment can be widely used in applications that utilize thermoplastic resin compositions. For example, it can be suitable for automotive components such as fuel piping components, electrical and electronic components such as printer components, but this is ultimately just an example and is not limited to these.

[0060] <Method for manufacturing components>

[0061] The manufacturing method of the component according to this embodiment is characterized by including: a step of preparing a thermoplastic resin composition (hereinafter referred to as "step A"), which is obtained by melt-blending at least 0.1 to 0.5 parts by mass of carbon nanostructures in 100 parts by mass of thermoplastic resin; and a step of molding the thermoplastic resin composition into a predetermined shape (hereinafter referred to as "step B").

[0062] The following describes each process.

[0063] [Process A]

[0064] In step A, a thermoplastic resin composition is prepared by melt-blending at least 0.1 to 0.5 parts by mass of carbon nanostructures into 100 parts by mass of thermoplastic resin. The preferred components, preferred contents, and other components of this thermoplastic resin composition are as described above. This thermoplastic resin composition is obtained by conventional methods by melt-blending the above-mentioned components and other components as needed. For example, it can be obtained by feeding the thermoplastic resin composition of this embodiment into an extruder for melt-blending and granulation. CNS is prepared in advance as a masterbatch, which can be used when CNS is added. Furthermore, the masterbatch refers to a pre-prepared thermoplastic resin composition containing a high concentration of CNS.

[0065] [Process B]

[0066] In step B, the thermoplastic resin composition is molded into a specified shape. For example, the granules obtained in the above manner are fed into an injection molding machine equipped with a specified mold for injection molding.

[0067] The manufacturing method of this embodiment described above enables the production of components with sufficient mechanical strength.

[0068] <Methods for improving the mechanical strength of parts made of thermoplastic resin compositions>

[0069] The method for improving the mechanical strength of a component made of a thermoplastic resin composition according to this embodiment is characterized by using a resin composition obtained by melt-blending 0.1 to 0.5 parts by mass of carbon nanostructures into 100 parts by mass of a thermoplastic resin.

[0070] As described above, the thermoplastic resin composition of this embodiment exhibits a nucleating effect by adding a predetermined amount of CNS, thereby improving mechanical strength. That is, by using the thermoplastic resin composition of this embodiment as a component, the mechanical strength of that component can be improved. In the method for improving the mechanical strength of a component made of the thermoplastic resin composition in this embodiment, the preferred contents of the thermoplastic resin and CNS, as well as other components, are as described above in the thermoplastic resin composition of this embodiment.

[0071] Example

[0072] The following examples will provide a more detailed description of this implementation method, but this implementation method is not limited to the following examples.

[0073] [Examples 1-5, Comparative Examples 1-8]

[0074] In each embodiment and comparative example, the raw material components shown in Tables 1 and 2 (except for glass fiber) were dry-mixed and then fed into a twin-screw extruder (glass fiber was added via side-feed) for melt mixing to form granules. Furthermore, the cylinder temperatures for the twin-screw extruder were set to 200°C for POM resin, 320°C for PPS resin, and 260°C for PBT resin. In Tables 1 and 2, the values ​​for each component represent parts by mass.

[0075] In addition, the following details the composition of each ingredient used.

[0076] (1) Thermoplastic resin

[0077] Polyoxymethylene resin

[0078] Polyoxymethylene resin; a polyoxymethylene copolymer copolymer formed by copolymerizing 96.7% by weight of trioxane and 3.3% by weight of 1,3-dioxane (melt flow rate (MFR) (determined according to ISO 1133, at 190°C and a load of 2160 g): 9.0 g / 10 min).

[0079] Polyphenylene sulfide resin

[0080] KUREHA Corporation, Fortron KPS (melt viscosity: 130 Pa·s, shear rate: 1200 sec) -1 310℃)

[0081] (Determination of melt viscosity of PPS resin)

[0082] The melt viscosity of the above-mentioned PPS resin was determined using the following method.

[0083] Using a Capilograph manufactured by Toyo Seiki Co., Ltd., a flat die with a diameter of 1 mm and a length of 20 mm was used for capillary applications. The temperature of the material barrel was 310°C, and the shearing speed was 1200 sec. -1 The melt viscosity was measured.

[0084] Polybutylene terephthalate resin

[0085] Polybutylene terephthalate resin manufactured by Polyplastics Co., Ltd. (intrinsic viscosity (measured in o-chlorophenol at 35°C): 1.0 dL / g)

[0086] (2) Carbon nanostructures (CNS)

[0087] CABOT Corporation, ATHLOS 200

[0088] (3) Nucleating agent

[0089] Boron nitride

[0090] Made by Denka Co., Ltd., Denka Boron Nitride GP

[0091] (4) Filler

[0092] ·talc

[0093] Matsumura Sangyo Co., Ltd., Crown talc PP

[0094] Glass beads

[0095] Made by Potters-Ballotini Co., Ltd., EGB731

[0096] · Glass fiber 1

[0097] Manufactured by Nippon Electric Glass Co., Ltd., ECS03T-651G

[0098] · Glass fiber 2

[0099] Short-cut raw fibers manufactured by Owens Corning Japan Co., Ltd.

[0100] Fiber diameter: 10.5μm, length: 3mm

[0101] [Table 1]

[0102]

[0103] [Table 2]

[0104]

[0105] [evaluate]

[0106] The multi-purpose test piece and the strip test piece as described in ISO 294-1 are formed by injection molding under the following conditions and used for the following evaluation.

[0107] POM resin composition

[0108] Molding machine: Toshiba Machine Co., Ltd. EC40

[0109] Molding is performed in accordance with ISO 9988-1,2.

[0110] PBT resin composition

[0111] Molding machine: Toshiba Machine Co., Ltd. EC40

[0112] Cylinder temperature: 260℃

[0113] Mold temperature: 80℃

[0114] PPS resin composition

[0115] Forming machine: Nippon Steel Corporation, J55AD-60H-USM

[0116] Cylinder temperature: 320℃

[0117] Mold temperature: 150℃

[0118] (1) Tensile strength

[0119] Using the test pieces obtained in the above manner, tensile strength was determined according to ISO 527-1,2. The test results are shown in Tables 1 and 2.

[0120] (2) Elongation at break

[0121] Using the test specimens obtained in the above manner, the elongation at break was determined according to ISO 527-1,2. The results are shown in Tables 1 and 2.

[0122] (3) Flexural modulus

[0123] Using the test pieces obtained in the above manner, the flexural modulus of elasticity was determined according to ISO 179. The results are shown in Tables 1 and 2.

[0124] (4) Impact resistance (Charpy impact strength)

[0125] Using the test pieces obtained as described above, the Charpy impact strength (notch) was determined according to ISO 179 / 1eA. The results are shown in Tables 1 and 2.

[0126] As shown in Table 1, each evaluation in Examples 1-5 yielded good results. That is, Examples 1-5 achieved improved mechanical properties without significantly compromising tensile elongation at break and impact resistance. More details are as follows: Specifically, when comparing Examples 1-3 and Comparative Examples 1-5 using POM resin, Comparative Example 1, which did not contain CNS, was inferior to Examples 1-3 in tensile strength and flexural modulus. Furthermore, Comparative Example 2, which contained 1 part by mass of CNS relative to 100 parts by mass of thermoplastic resin, was inferior to Examples 1-3 in tensile elongation at break. In particular, Comparative Example 2 showed a significant decrease in tensile elongation at break compared to Examples 1-3, while Comparative Example 1, which did not contain CNS, exhibited poor impact resistance. On the other hand, Comparative Examples 3-5, which did not contain CNS but contained ordinary fillers, showed poor impact resistance.

[0127] When comparing Example 4 and Comparative Example 6, which used PPS resin, the tensile strength and flexural modulus of elasticity were improved in Example 4, while the tensile elongation at break was almost unchanged.

[0128] When comparing Example 5, which used PBT resin, with Comparative Example 7, which did not contain CNS, the tensile strength and flexural modulus of elasticity were improved in Example 5, while the impact resistance did not decrease. Similarly, when comparing Example 5 with Comparative Example 8, which used a nucleating agent, Comparative Example 8 showed poorer impact resistance compared to Example 5.

Claims

1. A thermoplastic resin composition, characterized in that, It is obtained by melt-blending at least 0.1 to 0.5 parts by mass of carbon nanostructures into 100 parts by mass of thermoplastic resin. The thermoplastic resin is selected from the group consisting of polyaryl sulfide resin, polybutylene terephthalate resin, polyethylene terephthalate resin, and polyamide resin. The carbon nanostructure is a structure contained in the state of multiple carbon nanotubes combined, wherein the carbon nanotubes are combined with other carbon nanotubes through branching bonds and cross-linking structures.

2. A component, characterized in that, It is formed by molding the thermoplastic resin composition according to claim 1.

3. A method for manufacturing a component, characterized in that, include: A process for preparing a thermoplastic resin composition, wherein the thermoplastic resin composition is obtained by melt-blending at least 0.1 to 0.5 parts by mass of carbon nanostructures into 100 parts by mass of a thermoplastic resin; as well as A process for molding the thermoplastic resin composition into a specified shape. The thermoplastic resin is selected from the group consisting of polyaryl sulfide resin, polybutylene terephthalate resin, polyethylene terephthalate resin, and polyamide resin. The carbon nanostructure is a structure contained in the state of multiple carbon nanotubes combined, wherein the carbon nanotubes are combined with other carbon nanotubes through branching bonds and cross-linking structures.

4. A method for improving the mechanical strength of a component made of a thermoplastic resin composition, characterized in that, The thermoplastic resin composition uses a resin composition obtained by melt-blending 0.1 to 0.5 parts by weight of carbon nanostructures into 100 parts by weight of thermoplastic resin. The thermoplastic resin is selected from the group consisting of polyaryl sulfide resin, polybutylene terephthalate resin, polyethylene terephthalate resin, and polyamide resin. The carbon nanostructure is a structure contained in the state of multiple carbon nanotubes combined, wherein the carbon nanotubes are combined with other carbon nanotubes through branching bonds and cross-linking structures.

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