JP6872155B1 - Polyamide resin composition for sliding parts and sliding parts - Google Patents

Abstract

The present invention is required to have excellent moldability and heat-resistant stability, as well as excellent sliding characteristics, particularly wear resistance via particles having high hardness (hereinafter, also referred to as dust), and sliding stability. An object of the present invention is to provide a polyamide resin composition suitably used for molding moving parts. The polyamide resin composition for sliding parts of the present invention is a modified polyolefin resin having a crystalline polyamide resin (A), a reactive functional group capable of reacting with a terminal group and / or a main chain amide group of the polyamide resin (A). (B), a thermoplastic elastomer (C) having a reactive functional group capable of reacting with a terminal group and / or a main chain amide group of the polyamide resin (A), an antioxidant (D), and a mold release agent (E). ), And the modified polyolefin resin (B) and the thermoplastic elastomer (C) are dispersed in the matrix of the polyamide resin (A) in domains having a particle size of 5 μm or less.

Description

The present invention relates to a polyamide resin composition, and more particularly to a polyamide resin composition suitably used for molding sliding parts.

Polyamide resin is a molding material with excellent slidability due to its crystallinity, but in order to obtain better sliding properties, solid lubricants such as molybdenum disulfide, graphite and fluororesin, various lubricating oils, or silicones It is known to blend liquid lubricants such as oil.

Among these sliding improvers, a solid lubricant needs to be blended in a large amount, and has a drawback that the toughness of the base polyamide resin is remarkably lowered. A relatively small amount of liquid lubricant can provide highly effective slidability, but in many cases, it is incompatible with the base polyamide resin, and the surface of the molded product is easily contaminated with the liquid lubricant. It has the drawback of limiting its use.

As a method for improving the drawbacks caused by blending various lubricants, a method of blending a modified styrene polymer and a modified high-density polyethylene having a specific range of molecular weight (Patent Document 1), and a high-viscosity crystalline polyamide resin are used. At the same time, a method of blending a modified polyolefin resin has been proposed (Patent Document 2).

Such a polyamide resin composition has made it possible to provide a molded product having excellent sliding characteristics without the above-mentioned drawbacks, but in recent years, trends such as weight reduction of the molded product and complication of the shape of the molded product have been made. Therefore, higher levels of characteristics such as improved moldability, improved heat stability, and improved sliding characteristics are required.

Japanese Unexamined Patent Publication No. 8-157714 WO2008 / 075699

The present invention is required to have excellent moldability and heat-resistant stability, as well as excellent sliding characteristics, particularly wear resistance via particles having high hardness (hereinafter, also referred to as dust), and sliding stability. An object of the present invention is to provide a polyamide resin composition suitably used for molding moving parts.

As a result of diligent studies to achieve the above problems, the present inventors have found that antioxidants and mold release agents added for improving moldability and heat resistance improve sliding characteristics. The invention has been reached.

That is, the present invention has the following configuration.
[1]
A crystalline polyamide resin (A), a modified polyolefin resin (B) having a reactive functional group capable of reacting with a terminal group and / or a main chain amide group of the polyamide resin (A), and a terminal group of the polyamide resin (A). And / or a thermoplastic elastomer (C) having a reactive functional group capable of reacting with a main chain amide group, an antioxidant (D), and a mold release agent (E).
The modified polyolefin resin (B) and the thermoplastic elastomer (C) are a polyamide resin composition for sliding parts in which the polyamide resin (A) is dispersed in a domain having a particle size of 5 μm or less.
[2]
The antioxidant (D) and the release agent (E) are compounds that suppress the deactivation of the reactive functional group of the modified polyolefin resin (B) and the thermoplastic elastomer (C). The polyamide resin composition for sliding parts according to [1].
[3]
The polyamide resin composition according to [1] or [2], wherein the reactive functional group is an acid anhydride group.
[4]
The polyamide resin composition for sliding parts according to any one of [1] to [3], wherein the antioxidant (D) is a hindered phenolic antioxidant.
[5]
The polyamide resin composition for sliding parts according to any one of [1] to [4], wherein the release agent (E) is a higher fatty acid ester compound.
[6]
The polyamide resin composition for sliding parts according to any one of [1] to [5], wherein the thermoplastic elastomer (C) is a styrene-based and / or olefin-based thermoplastic elastomer.
[7]
A sliding component obtained from the polyamide resin composition for a sliding component according to any one of [1] to [6].

The polyamide resin composition of the present invention is not only excellent in moldability and heat resistance stability, but also has improved wear resistance and further improved sliding characteristics such as a small change in friction coefficient.

It is an image which observed the cross section of the evaluation sample prepared in Example 1 with a differential interference microscope. It is an image which observed the cross section of the evaluation sample prepared in the comparative example 6 with a differential interference microscope.

Hereinafter, the present invention will be specifically described. The polyamide resin composition for sliding parts of the present invention is a modified polyolefin resin having a crystalline polyamide resin (A), a reactive functional group capable of reacting with a terminal group and / or a main chain amide group of the polyamide resin (A). (B) (hereinafter, also referred to as modified polyolefin resin (B)), a thermoplastic elastomer (C) having a reactive functional group capable of reacting with a terminal group and / or a main chain amide group of the polyamide resin (A). Hereinafter, it is also referred to as a thermoplastic elastomer (C)), an antioxidant (D), and a mold release agent (E).

The blending amount of each component is represented by the mass part when the total of all the resin components of the crystalline polyamide resin (A), the modified polyolefin resin (B), and the thermoplastic elastomer (C) is 100 parts by mass. In the polyamide resin composition of the present invention, the blending amount is the content in the polyamide resin composition as it is.

The crystalline polyamide resin (A) is not particularly limited as long as it is a crystalline polymer having an amide bond (-NHCO-) in the main chain, and for example, polyamide 6 (NY6), polyamide 66 (NY66), and polyamide. 46 (NY46), Polyamide 11 (NY11), Polyamide 12 (NY12), Polyamide 610 (NY610), Polyamide 612 (NY612), Polymethaxylylene adipamide (MXD6), Hexamethylenediamine-terephthalic acid polymer (6T) , Hexamethylenediamine-terephthalic acid and adipic acid polymer (66T), hexamethylenediamine-terephthalic acid and ε-caprolactam copolymer (6T / 6), trimethylhexamethylenediamine-terephthalic acid polymer (TMD-T), Metaxylylene diamine and adipic acid and isophthalic acid copolymer (MXD-6 / I), trihexamethylenediamine and terephthalic acid and ε-caprolactam copolymer (TMD-T / 6), diaminodicyclohexylenemethane (CA) ), Isophthalic acid, lauryl lactam copolymer and the like. These may be used alone or in a blend of two or more. Of these, polyamide 6 (NY6) and polyamide 66 (NY66) are preferably used.

The relative viscosity of the crystalline polyamide resin (A) is not particularly limited, but is measured in a 96% sulfuric acid solution (polyamide resin concentration 1 g / dl, temperature 25 ° C.), and is preferably 2.0 to 5.0. , More preferably 2.0 to 3.5.

The modified polyolefin resin (B) is a modified polyolefin resin. Examples of the polyolefin resin include high-density polyethylene, low-density polyethylene, ultra-high molecular weight polyethylene, linear low-density polyethylene, polypropylene, poly (1-butene), poly (4-methylpentene) and the like. These may be used alone or in a blend of two or more. Of these, it is preferable to use high-density polyethylene.

The modified polyolefin resin (B) has a terminal group (amino group or carboxy group) and / or a main chain amide group of the polyamide resin (A) in order to improve compatibility with the crystalline polyamide resin (A). It has a reactive functional group that can react. Examples of the reactive functional group include a carboxy group, an acid anhydride group, an epoxy group, an oxazoline group, an amino group, an isocyanate group and the like. Of these, an acid anhydride group is preferable from the viewpoint of high reactivity with the polyamide resin (A).

The content of the reactive functional group is preferably 0.05 to 8% by mass, more preferably 0.1 to 5% by mass in the modified polyolefin resin (B). The method for producing the modified polyolefin resin (B) having the reactive functional group is not particularly limited, but a method for reacting the compound having the reactive functional group in the step of producing the polyolefin resin, the pellet of the polyolefin resin and the reactivity. Examples thereof include a method in which a compound having a functional group and the like are mixed and kneaded with an extruder or the like to cause a reaction.

The blending amount of the modified polyolefin resin (B) is not particularly limited as long as the modified polyolefin resin (B) can be dispersed in the matrix of the polyamide resin (A) in a domain having a particle size of 5 μm or less, but is usually all. It is 0.5 to 10% by mass, preferably 1 to 8% by mass, and more preferably 2 to 6% by mass with respect to 100% by mass of the resin component.

The thermoplastic elastomer (C) is not particularly limited, and examples thereof include styrene-based thermoplastic elastomers, olefin-based thermoplastic elastomers, polyamide-based thermoplastic elastomers, polyester-based thermoplastic elastomers, and polyurethane-based thermoplastic elastomers. These may be used alone or in a blend of two or more.

The styrene-based thermoplastic elastomer is not particularly limited, and for example, styrene / butadiene / styrene block copolymer (SBS), its hydrogenated styrene / ethylene-butylene / styrene block copolymer (SEBS), styrene / butadiene. Styrene (SBR), its hydrogenated styrene / ethylene / butylene copolymer (HSBR), styrene / isoprene / styrene block copolymer (SIS), its hydrogenated styrene / ethylene / propylene / Examples thereof include styrene block copolymer (SEPS).

The olefin-based thermoplastic elastomer is not particularly limited, and for example, rubbers such as ethylene / propylene / diene rubber (EPDM), ethylene / propylene rubber (EPR), and butyl rubber (IIR), dynamically crosslinked olefin-based thermoplastic elastomers, and flexibility. Examples thereof include ethylene-based copolymers having a certain content.

The polyamide-based thermoplastic elastomer is not particularly limited, and examples thereof include a polyether ester amide and a polyester amide having a crystalline polyamide having a high melting temperature as a hard segment and a polyether having a low glass transition temperature or a polyester as a soft segment. Be done.

The polyester-based thermoplastic elastomer is not particularly limited, and for example, the block common weight of the polyether polyester and the polyester polyester having a crystalline polyester having a high melting temperature as a hard segment and a polyether having a low glass transition temperature or a polyester as a soft segment. Coalescence and the like can be mentioned.

The polyurethane-based thermoplastic elastomer is not particularly limited, and examples thereof include polyether polyurethane and polyester polyurethane having a polyester having a high crystalline and high melting temperature as a hard segment and a polyether having a low glass transition temperature or a polyester as a soft segment. ..

Among these thermoplastic elastomers, styrene-based and / or olefin-based thermoplastic elastomers are preferable, more preferably styrene-based thermoplastic elastomers, and even more preferably SEBS, from the viewpoint of the balance between the toughness improving effect and the elastic modulus. is there.

The thermoplastic elastomer (C) may be combined with a terminal group (amino group or carboxy group) and / or a main chain amide group of the polyamide resin (A) in order to improve compatibility with the crystalline polyamide resin (A). It has a reactive functional group that can react. Examples of the reactive functional group include a carboxy group, an acid anhydride group, an epoxy group, an oxazoline group, an amino group, an isocyanate group and the like. Of these, an acid anhydride group is preferable from the viewpoint of high reactivity with the polyamide resin (A).

The content of the reactive functional group is preferably 0.05 to 8% by mass, more preferably 0.1 to 5% by mass in the thermoplastic elastomer (C). The method for producing the thermoplastic elastomer (C) having the reactive functional group is not particularly limited, but a method for reacting the compound having the reactive functional group in the step of producing the thermoplastic elastomer, the pellet of the thermoplastic elastomer and the above. Examples thereof include a method in which a compound having a reactive functional group or the like is mixed and kneaded with an extruder or the like to react.

The blending amount of the thermoplastic elastomer (C) is not particularly limited as long as the thermoplastic elastomer (C) can be dispersed in the matrix of the polyamide resin (A) in a domain having a particle size of 5 μm or less, but is usually all. It is 0.1 to 10% by mass, preferably 1 to 7% by mass, based on 100% by mass of the resin component.

The antioxidant (D) is preferably a compound that suppresses the deactivation of the reactive functional group of the modified polyolefin resin (B) and the thermoplastic elastomer (C). "Suppressing the inactivation of a reactive functional group" means "does not react with a reactive functional group". That is, the antioxidant (D) is a compound that does not prevent the modified polyolefin resin (B) and the thermoplastic elastomer (C) from being finely dispersed in the matrix of the polyamide resin (A).

The antioxidant (D) is not particularly limited, and for example, when the reactive functional group of the modified polyolefin resin (B) and the thermoplastic elastomer (C) is an acid anhydride group, it reacts with the acid anhydride group. Examples thereof include organic antioxidants such as hindered phenolic antioxidants, sulfur-based antioxidants and phosphorus-based antioxidants, and thermal stabilizers, which do not have functional groups, and are preferably hindered phenolic oxidation. It is an inhibitor. These may be used alone or in a blend of two or more. Examples of the functional group that reacts with the acid anhydride group include an amino group and a hydroxyl group. The phenolic hydroxyl group having a hindered phenol structure does not correspond to a functional group that reacts with an acid anhydride group. Amine-based antioxidants are not preferable because they react with the reactive functional groups to inactivate them.

The blending amount of the antioxidant (D) is preferably 0.01 to 1 part by mass, more preferably 0.1 to 0.5 parts by mass, based on 100 parts by mass of the total resin component. When the blending amount of the antioxidant (D) is within the above range, it not only contributes to the improvement of the slidability and toughness of the polyamide resin composition, but also as an appropriate prescription amount according to the amount of the polyamide resin composition. , It is possible to prevent oxidative deterioration over time.

The release agent (E) is preferably a compound that suppresses the deactivation of the reactive functional group of the modified polyolefin resin (B) and the thermoplastic elastomer (C). "Suppressing the inactivation of a reactive functional group" means "does not react with a reactive functional group". That is, the release agent (E) is a compound that does not prevent the modified polyolefin resin (B) and the thermoplastic elastomer (C) from being finely dispersed in the matrix of the polyamide resin (A).

The release agent (E) is not particularly limited, and examples thereof include higher fatty acid ester compounds, amide compounds, polyethylene wax, silicone, and polyethylene oxide. These may be used alone or in a blend of two or more. When the reactive functional group of the modified polyolefin resin (B) and the thermoplastic elastomer (C) is an acid anhydride group, the release agent (E) is preferably a higher fatty acid ester compound. The higher fatty acid is a fatty acid having more than 10 carbon atoms, preferably a fatty acid having 11 to 30 carbon atoms. The metal salt compound is not preferable because it reacts with the reactive functional group to inactivate it.

The amount of the release agent (E) to be blended is preferably 0.05 to 1 part by mass, more preferably 0.1 to 0.8 parts by mass with respect to 100 parts by mass of the total resin component. When the blending amount of the release agent (E) is within the above range, not only the slidability and toughness of the polyamide resin composition can be improved, but also an appropriate release property can be ensured.

The antioxidant (D) and the mold release agent (E) do not prevent the modified polyolefin resin (B) and the thermoplastic elastomer (C) from being finely dispersed in the matrix of the polyamide resin (A). Therefore, the modified polyolefin resin (B) and the thermoplastic elastomer (C) efficiently react with the polyamide resin (A) and are finely dispersed in the matrix of the polyamide resin (A) in domains having a particle size of 5 μm or less. .. As a result, it is considered that the slidability improving effect of the modified polyolefin resin (B) and the toughness improving effect of the thermoplastic elastomer (C) work effectively, and the unique effect of the present invention is exhibited. The particle size is preferably 4 μm or less, more preferably 3.5 μm or less. The lower limit of the particle size is not particularly limited, but from the viewpoint of fluidity, it is preferably 1 μm or more, and more preferably 2 μm or more.

The above-mentioned (A) is contained in the polyamide resin composition of the present invention as long as it does not prevent the modified polyolefin resin (B) and the thermoplastic elastomer (C) from being finely dispersed in the matrix of the polyamide resin (A). )-(E), carbon black, copper oxide, alkali metal halide, light or heat stabilizer, crystal nucleating agent, gliding, which are weather resistance improving agents, which are blended in the conventional polyamide resin composition. Additives such as materials, antioxidants, pigments, dyes, and coupling agents may be blended. Further, by blending the filler, the strength and rigidity of the molded product can be significantly improved. Fillers include, for example, glass fiber, carbon fiber, metal fiber, aramid fiber, asbestos, potassium titanate whisker, wallastnite, glass flakes, glass beads, talc, mica, clay, calcium carbonate, barium sulfate, titanium oxide. , Aluminum oxide and the like. The polyamide resin composition of the present invention preferably occupies 70% by mass or more, more preferably 80% by mass or more, and occupies 90% by mass or more in total of the above-mentioned components (A) to (E). Is even more preferable.

The polyamide resin composition of the present invention is produced, for example, by kneading each component using a kneading device such as a single-screw extruder, a twin-screw extruder, or a pressure kneader. The kneading device is preferably a twin-screw extruder. As one embodiment, the components (A) to (E) and, depending on the intended use, pigments and the like are mixed and charged into a twin-screw extruder. A polyamide resin composition having excellent slidability can be produced by uniformly kneading with a twin-screw extruder. The kneading temperature of the twin-screw extruder is preferably 220 to 300 ° C., and the kneading time is preferably about 2 to 15 minutes.

The polyamide resin composition of the present invention can be widely used as a raw material for sliding parts such as electric / electronic parts, automobile parts, building parts, and industrial parts, which are required to have slidability. Specific examples of the sliding parts include bearings, gears, door checkers, chain guide parts, and the like.

Hereinafter, the present invention will be specifically described with reference to Examples, but the present invention is not limited to these Examples. The physical characteristics of the polyamide resin molded product obtained in each of the following examples were measured based on the following test method.

The raw materials used in the examples and comparative examples are as follows.
(A1) to (A3) were used as the crystalline polyamide resin (A).
(A1) Polyamide 66 (RV = 3.4): EPR34W (manufactured by Shanghai Shinma Plastics Technology Co., Ltd.), melting point 265 ° C.
(A2) Polyamide 66 (RV = 2.8): Vydyne 21FSR (manufactured by Ascend), melting point 265 ° C.
(A3) Polyamide 66 (RV = 2.4): EPR24 (manufactured by Shanghai Shinma Plastics Technology Co., Ltd.), melting point 265 ° C.

(B1) and (B2) were used as the modified polyolefin resin (B).
(B1) Maleic anhydride-modified polyethylene: Modic DH0200 (manufactured by Mitsubishi Chemical Corporation)
(B2) Unmodified polyethylene: Hi-Zex 6203B (manufactured by Prime Polymer Co., Ltd.)

(C1) and (C2) were used as the thermoplastic elastomer (C).
(C1) Maleic anhydride-modified SEBS: Tough Tech M-1943 (manufactured by Asahi Kasei Corporation)
(C2) Unmodified SEBS: Tough Tech H-1221 (manufactured by Asahi Kasei Corporation)

(D1) and (D2) were used as the antioxidants (D).
(D1) Hindered Phenolic Antioxidant: Triethylene Glycol-Bis-3- (3-t-Butyl-4-Hydroxy-5-Methylphenyl) Propionate (SONGNOX2450, manufactured by SONGWON)
(D2) Amine-based antioxidant: Non-flex DCD (manufactured by Seiko Kagaku Co., Ltd.)

(E1) to (E3) were used as the release agent (E).
(E1) Aliphatic ester: Recolve WE-40 (manufactured by Clariant Japan Co., Ltd.)
(E2) Magnesium stearate: N. P. 1500-S (manufactured by Tannan Chemical Industry Co., Ltd.)
(E3) Calcium montanate: Recommon Cav102 (manufactured by Clariant Japan Co., Ltd.)

[Examples 1 to 7, Comparative Examples 1 to 8]
In the production of the evaluation sample, each raw material was weighed at the blending ratios of the polyamide resin compositions shown in Tables 1 and 2, mixed with a tumbler, and then put into a twin-screw extruder. The set temperature of the twin-screw extruder was 250 ° C. to 300 ° C., and the kneading time was 5 to 10 minutes. Using the obtained pellets, various evaluation samples were molded by an injection molding machine. The cylinder temperature of the injection molding machine was 250 ° C. to 290 ° C., and the mold temperature was 80 ° C.

Various evaluation and measurement methods are as follows. The evaluation and measurement results are shown in Tables 1 and 2.
1. 1. Relative viscosity of polyamide resin (96% sulfuric acid solution method)
The measurement was carried out using a Ubbelohde viscous tube at 25 ° C. with a 96 mass% sulfuric acid solution at a polyamide resin concentration of 1 g / dl.

2. Melting point of polyamide resin Using a differential scanning calorimeter (Seiko Instruments Co., Ltd., EXSTAR 6000), the temperature was measured at a heating rate of 20 ° C./min to determine the endothermic peak temperature.

3. 3. Tensile strength, tensile elastic modulus, and tensile elongation were measured according to ISO178.

4. Impact resistance Measured according to ISO179-1.

5. Using a slidable thrust type abrasion tester, dust created by mixing grease containing molybdenum disulfide and silica sand and volcanic ash so that the mass ratio is 1: 1: 1 is uniformly applied to the surface. The polyamide resin flat plate coated in a certain amount was brought into contact with a cylindrical molded product made of polyoxymethylene (POM) ^{and continuously slid for 30 minutes under the conditions of a load of 30 kgf / cm 2} and a speed of 40 mm / sec. After that, the dynamic friction coefficient was calculated from the weight difference before and after wear and the value of the converged wear load during the friction test.

6. A molded evaluation sample was cut out and a cross section was prepared using a microtome equipped with a glass knife. The prepared cross section was observed with a differential interference microscope and photographed. Among the domains of the modified polyolefin resin (B) and the thermoplastic elastomer (C) in the micrograph, 10 domains having the largest dispersion diameter are arbitrarily selected, the major axis of the selected domain is measured, and the average value is measured as a grain. The diameter was set.

In Examples 1 to 7, the Charpy impact strength is 6 kJ / m ² or more, and a composition having higher toughness as compared with the unmodified polyamide is obtained. In addition, the tensile elastic modulus and tensile elongation are not significantly impaired. It also has better wear resistance than Comparative Examples 1 to 8 in terms of the amount of wear and the coefficient of dynamic friction after the sliding test using dust. In Comparative Examples 1 and 2, brittle surface fracture during sliding could not be suppressed due to insufficient toughness, and the amount of wear was large. In Comparative Example 3, although the toughness is sufficient, the sliding modification effect of the polyolefin resin is difficult to work. Comparative Example 4 is not suitable because it is formulated with an unmodified thermoplastic elastomer, so that it is difficult to form a finely dispersed domain, and the particle size is such that it is difficult to develop excellent physical properties. Since Comparative Examples 5, 6 and 7 use amine-based antioxidants and fatty acid metal salts, respectively, they react with the reactive functional groups of the modified polyolefin resin or thermoplastic elastomer to inactivate the reactive functional groups. Cannot form a finely dispersed domain. Since Comparative Example 8 is formulated with an unmodified polyolefin resin, it is also difficult to form a finely dispersed domain, the sliding modification effect does not work uniformly on the surface, and the amount of wear is large.

FIG. 1 is an image obtained by observing a cross section of Example 1 with a differential interference microscope. It can be seen that the polyolefin resin and the thermoplastic elastomer are uniformly finely dispersed in the domain of the polyamide resin in the domain having a particle size of 5 μm or less. On the other hand, FIG. 2 is an image obtained by observing the cross section of Comparative Example 6 with a differential interference microscope. The above two modifiers are non-uniformly dispersed in the matrix of the polyamide resin, and a finely dispersed domain cannot be formed. In addition, it exists in a coarse domain, where stress is concentrated during wear and can be the starting point of wear.

The polyamide resin composition of the present invention is a molding material having both excellent toughness and sliding properties. Especially suitable for sliding parts that are required to have excellent wear resistance and sliding stability through particles with high hardness, and as an engineering plastic that can be used in a wide range of fields, it will greatly contribute to the industrial world. You can expect it.

Claims (7)

A crystalline polyamide resin (A), a modified polyolefin resin (B) having a reactive functional group capable of reacting with a terminal group and / or a main chain amide group of the polyamide resin (A), and a terminal group of the polyamide resin (A). And / or a thermoplastic elastomer (C) having a reactive functional group capable of reacting with a main chain amide group, an antioxidant (D), and a mold release agent (E).
The modified polyolefin resin (B) and the thermoplastic elastomer (C) are a polyamide resin composition for sliding parts in which the polyamide resin (A) is dispersed in a domain having a particle size of 5 μm or less. Claimed that the antioxidant (D) and the mold release agent (E) are compounds that suppress the deactivation of the reactive functional group of the modified polyolefin resin (B) and the thermoplastic elastomer (C). Item 2. The polyamide resin composition for sliding parts according to Item 1. The polyamide resin composition for sliding parts according to claim 1 or 2, wherein the reactive functional group is an acid anhydride group. The polyamide resin composition for sliding parts according to any one of claims 1 to 3, wherein the antioxidant (D) is a hindered phenolic antioxidant. The polyamide resin composition for sliding parts according to any one of claims 1 to 4, wherein the release agent (E) is a higher fatty acid ester compound. The polyamide resin composition for sliding parts according to any one of claims 1 to 5, wherein the thermoplastic elastomer (C) is a styrene-based and / or olefin-based thermoplastic elastomer. A sliding component obtained from the polyamide resin composition for a sliding component according to any one of claims 1 to 6.

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