JP2018150461A - Polyamide resin composition, resin molding obtained from the composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a polyamide resin composition which sufficiently exhibits good appearance of a molding, wear resistance to a steel material and a polyamide resin molding, and wear resistance under a sliding condition with a higher load, and to provide a resin molding obtained from the resin composition.SOLUTION: The polyamide resin composition is provided which includes a polyamide resin (A), polytetrafluoroethylene (B) and a copolymer (C), and in which (C) is a graft copolymer obtained by reaction of a monomer component including polyethylene and styrene or styrene and acrylonitrile, and t-butyl peroxy methacryloyloxy ethylcarbonate, and in which a weight ratio of the polyethylene to the monomer component is 40/60 to 95/5, the weight of the total of (B) and (C) with respect to 100 pts.wt. of (A) is 1-50 pts.wt., and a weight ratio of (B) to (C) is 30/70 to 95/5.SELECTED DRAWING: None

Description

  The present invention relates to a polyamide resin composition and a resin molded product obtained from the composition.

Plastic materials used for sliding parts (parts that slide with metal and resin) such as gears, cam bearings and bearing retainers have high wear resistance, excellent mechanical properties, and softening It is necessary to satisfy that the temperature is high and molding is easy. In addition, if the mating material is not subject to damage such as wear, and if there is a non-uniform portion such as a defective appearance on the sliding surface, wear tends to occur from that point, resulting in poor appearance of the sliding surface. It is required to be difficult to do. A polyamide resin is widely used as a resin having excellent performance.

  Recently, in the field of automobile parts and electrical equipment, there is an increasing tendency to demand lighter and smaller mechanism parts, and substitution from metal to resin is progressing. As a result, there are increasing opportunities for sliding between resin parts and use in a higher load environment than in the past, and there are cases where performance is not satisfied when the polyamide resin is used alone.

  As a method for improving the abrasion resistance of a polyamide resin, for example, Patent Document 1 proposes a polyamide resin composition in which polytetrafluoroethylene is mixed, and Patent Document 2 is a mixture of a graft copolymer.

  Furthermore, as a method for improving the wear resistance of a polyamide resin, Patent Document 3 discloses a polyamide resin composition in which carbon fibers, a fluorocarbon polymer (such as polytetrafluoroethylene) and a high-density polyethylene resin are mixed. .

JP-A-63-251448 JP-A-4-270708 JP 7-41666 A

  However, although the resin molded body obtained from the polyamide resin composition added with polytetrafluoroethylene disclosed in Patent Document 1 is effective in improving the wear resistance against steel, it is still insufficient. Moreover, although the polyamide resin molding which added the graft copolymer disclosed by patent document 2 is effective in improving the abrasion resistance with respect to steel materials and polyamide resins, the abrasion resistance in high load is inadequate. there were. Furthermore, the polyamide resin molded body using the carbon fiber, fluorocarbon polymer and high-density polyethylene resin disclosed in Patent Document 3 also exhibits a sufficient effect with respect to the wear resistance against the steel material, but wear resistance against the polyamide resins. It was insufficient to improve the sex. Further, polytetrafluoroethylene and polyethylene are poorly compatible with polyamide resin, and appearance deterioration such as peeling of the surface of the molded product has been observed, so further improvement has been demanded.

  In view of the circumstances as described above, the present invention has a good appearance of a molded body, wear resistance against steel materials and polyamide resin molded bodies, and wear resistance under higher load sliding conditions. An object of the present invention is to provide a polyamide resin composition that fully expresses the above and a resin molded product obtained from the resin composition.

  That is, the present invention is a polyamide resin composition comprising a polyamide resin (A), a polytetrafluoroethylene (B), and a copolymer (C), wherein the copolymer (C) comprises polyethylene, A graft copolymer obtained by reacting styrene or a monomer component containing styrene and acrylonitrile and t-butylperoxymethacryloyloxyethyl carbonate (hereinafter also referred to as MEC), and a weight ratio of the polyethylene to the monomer component (Polyethylene / monomer component) is 40/60 to 95/5, and the total of the polytetrafluoroethylene (B) and the copolymer (C) is 100 parts by weight of the polyamide resin (A). The weight is 1 to 50 parts by weight, and the polytetrafluoroethylene (B) and the copolymer (C The weight ratio ((B) / (C)), the polyamide resin composition, which is a 30 / 70-95 / 5, relates.

  The present invention also relates to a resin molded product obtained from the polyamide resin composition.

  The polyamide resin composition of the present invention comprises a polyamide resin (A), polytetrafluoroethylene (B) and a copolymer (C) (mainly polyethylene as a main chain, poly (styrene-MEC) as additives. Or a specific graft copolymer having a poly (acrylonitrile-styrene-MEC) copolymer as a side chain), the molded product obtained from the resin composition is a steel material or a resin molded product. Abrasion resistance can be improved. Furthermore, since the molded product obtained from the polyamide resin composition of the present invention can sufficiently exhibit wear resistance even under higher load sliding conditions, the amount of wear during sliding should be remarkably small. Therefore, it is expected that there is an effect that almost no sliding noise is generated. Moreover, even when the polyamide resin composition of the present invention is molded into a predetermined shape by injection molding, extrusion molding or the like, a resin molded body having a good appearance can be obtained.

  The polyamide resin composition of the present invention includes a polyamide resin (A), polytetrafluoroethylene (B), and a copolymer (C).

<Polyamide resin (A)>
The polyamide resin (A) is a polymer having an amide bond formed from an amino acid, a lactam, a diamine, and a dicarboxylic acid (including a pair of salts thereof). Examples of the polyamide resin (A) include polycoupleramide (nylon 6), polytetramethylene adipamide (nylon 46), polyhexamethylene adipamide (nylon 66), polyhexamethylene sebacamide (nylon 610), Polyhexamethylene dodecamide (nylon 612), polyundecamethylene adipamide (nylon 116), polyundecamide (nylon 11), polydodecamide (nylon 12), polytrimethylhexamethylene terephthalamide (nylon TMDT), polyhexamethylene isophthalamide (Nylon 6I), polyhexamethylene terephthalate / isophthalamide (nylon 6T / 6I), polybis (4-aminocyclohexyl) methane dodecamide (nylon PACM12), polybis (3-methyl-4) Aminocyclohexyl) methane dodecamide (nylon dimethyl PACM12), polymetaxylylene adipamide (nylon MXD6), polynonamethylene terephthalamide (nylon 9T), polyundecamethylene terephthalamide (nylon 11T), polyundecamethylene hexahydro Examples thereof include terephthalamide (nylon 11T (H)), copolymerized polyamides thereof, mixed polyamides, etc. Among them, nylon 6 or a copolymerized polyamide thereof, nylon 66 or a copolymerized polyamide thereof is preferable, and nylon 6 or nylon 66 is preferable. More preferred. The said polyamide resin (A) may be used independently and may use 2 or more types together.

  Further, the polyamide resin (A) is impregnated with reinforcing fibers (for example, high strength and high modulus fibers such as carbon fibers, glass fibers, aramid fibers, alumina fibers, silicon carbide fibers, boron fibers, metal fibers). Polyamide resin is also mentioned. Examples of the commercially available products include “Zytel 70G33L” (nylon 66 + glass fiber 33%) manufactured by DuPont Co., Ltd., “Amilan CM3001G30” (nylon 66 + glass fiber 30%) manufactured by Toray Industries, Inc., Asahi Kasei Corporation. “Leona 14G15” (nylon 66 + 15% glass fiber) and the like are available.

<Polytetrafluoroethylene (B)>
The polytetrafluoroethylene (B) is a fluororesin (fluorinated carbon resin) composed only of fluorine atoms and carbon atoms. As polytetrafluoroethylene (B), various known ones can be used without limitation. Examples of commercially available products include “TLP-10F” manufactured by Mitsui DuPont Fluorochemical Co., Ltd. and Daikin Industries, Ltd. “Polyflon M-12”, “Polyflon F-201”, “Lublon L-2”, “Lublon L-5”, “Fullon G-163”, “Fullon CD-123”, “Fullon L-” manufactured by Asahi Glass Co., Ltd. 169J "," KTL-450 "and" KTL-610 "manufactured by Kitamura. The polytetrafluoroethylene (B) may be used alone or in combination of two or more.

<Copolymer (C)>
The copolymer (C) is a graft copolymer obtained by reacting polyethylene, a monomer component containing styrene or styrene and acrylonitrile, and t-butylperoxymethacryloyloxyethyl carbonate (MEC). It is a coalescence. The said copolymer (C) may be used independently and may use 2 or more types together.

  The polyethylene is an ethylene homopolymer derived from ethylene, a copolymer of ethylene and an α-olefin having 3 to 10 carbon atoms, or a copolymer of ethylene and at least one other monomer. is there. Examples of the polyethylene include low density polyethylene, medium density polyethylene, high density polyethylene, linear low density polyethylene, and ultrahigh molecular weight polyethylene. From the viewpoint of moldability of the polyamide resin composition, the low density polyethylene is used. Is preferred. The said polyethylene may be used independently and may use 2 or more types together.

  Examples of the α-olefin include propylene, butene-1, 4-methylpentene-1, hexene-1, octene-1, and decene-1. Examples of the other monomers include conjugated dienes (eg, butadiene, isoprene, etc.), non-conjugated dienes (eg, 1,4 pentadiene, etc.), acrylic acid, acrylic acid esters (eg, methyl acrylate, acrylic acid). Ethyl etc.), methacrylic acid, methacrylic acid ester (for example, methyl methacrylate, ethyl methacrylate, etc.), vinyl acetate and the like.

  The copolymer (C) is a graft copolymer (mainly obtained by reacting the polyethylene, a monomer component containing styrene or styrene and acrylonitrile, and t-butylperoxymethacryloyloxyethyl carbonate (MEC)). The polyethylene has a main chain and a poly (styrene-MEC) or poly (acrylonitrile-styrene-MEC) copolymer as a side chain), and the weight ratio of the polyethylene to the monomer component (polyethylene / monomer) Component) is 40/60 to 95/5.

The t-butylperoxymethacryloyloxyethyl carbonate is a compound represented by the following general formula (1).

  The weight ratio of the polyethylene to the monomer component (polyethylene / monomer component) is preferably 45/65 or more from the viewpoint of obtaining a polyamide resin molded article having a good appearance and high wear resistance. / 50 or more is more preferable, 90/10 or less is preferable, and 85/15 or less is more preferable.

  The method for producing the copolymer (C) is a polymerization method using the t-butylperoxymethacryloyloxyethyl carbonate (radically polymerizable organic peroxide).

  In the polymerization method using the radical polymerizable organic peroxide, the styrene or styrene and acrylonitrile are added to a solution (polyethylene concentration: 10 to 30% by weight) in which the polyethylene is suspended in a medium containing water as a main component. A monomer component containing, the t-butylperoxymethacryloyloxyethyl carbonate, and a polymerization initiator, and the monomer component, the t-butylperoxymethacryloyloxyethyl carbonate, and the polymerization initiator in the polyethylene (polyethylene particles). And a step of producing a graft copolymer (C) by polymerizing the monomer component to obtain a precursor and melting and kneading (melt-kneading) the precursor. . In addition, when suspending the said polyethylene, you may use about 0.1-1 weight part of suspension agents (for example, polyvinyl alcohol) with respect to 100 weight part of said polyethylene as needed. Further, at the time of the impregnation, in order to sufficiently impregnate the polyethylene with a monomer component or the like, the polyethylene may be stirred while being heated (for example, about 60 to 80 ° C.).

  The polymerization initiator is not particularly limited as long as it generates radicals by heat, and examples thereof include organic peroxides and azo polymerization initiators. A polymerization initiator may be used independently and may use 2 or more types together.

  The polymerization initiator suppresses rapid decomposition of the polymerization initiator, and has a 10-hour half-life temperature (hereinafter also referred to as T10) of 40 ° C. or higher from the viewpoint of suppressing the remaining of the polymerization initiator and the monomer component. Preferably, it is 50 ° C. or higher, more preferably 130 ° C. or lower, more preferably 100 ° C. or lower, and even more preferably 80 ° C. or lower. The 10-hour half-life temperature (T10) is determined when the solution dissolved in benzene is thermally decomposed so that the peroxide bond or azo bond concentration contained in the polymerization initiator is 0.1 mol / liter. In addition, it means a temperature at which the polymerization initiator reaches a half-life in 10 hours.

  Examples of the polymerization initiator include t-butyl peroxyneoheptanoate (T10 = 51 ° C.), t-hexyl peroxypivalate (T10 = 53 ° C.), t-butyl peroxypivalate (T10 = 55). ° C), di (3,5,5-trimethylhexanoyl) peroxide (T10 = 59 ° C), dilauroyl peroxide (T10 = 62 ° C), 1,1,3,3-tetramethylbutylperoxy-2 -Ethylhexanoate (T10 = 65 ° C), 2,5-dimethyl-2,5-di (2-ethylhexanoylperoxy) hexane (T10 = 66 ° C), t-hexylperoxy-2-ethylhexylhexa Noate (T10 = 70 ° C.), di (4-methylbenzoyl) peroxide (T10 = 71 ° C.), t-butylperoxy-2-ethylhexene Noate (T10 = 72 ° C.), dibenzoyl peroxide (T10 = 74 ° C.), t-hexylperoxyisopropyl monocarbonate (T10 = 95 ° C.), t-butylperoxy-3,5,5-trimethylhexanoate (T10 = 97 ° C.), t-butyl peroxylaurate (T10 = 98 ° C.), t-butyl peroxyisopropyl monocarbonate (T10 = 99 ° C.), t-butyl peroxy-2-ethylhexyl monocarbonate (T10 = 99 ° C), t-hexylperoxybenzoate (T10 = 99 ° C), 2,5-dimethyl-2,5-di (benzoylperoxy) hexane (T10 = 100 ° C), t-butylperoxyacetate (T10 = 102 ° C.), 2,2-di (t-butylperoxy) butane (T10 = 103 ° C.) t-butylperoxybenzoate (T10 = 104 ° C.), n-butyl-4,4-di (t-butylperoxy) valerate (T10 = 105 ° C.), di (2-t-butylperoxyisopropyl) benzene ( T10 = 119 ° C.), dicumyl peroxide (T10 = 116 ° C.), di-t-hexyl peroxide (T10 = 116 ° C.), 2,5-dimethyl-2,5-di (t-butylperoxy) hexane (T10 = 118 ° C.), organic peroxides such as t-butylcumyl peroxide (T10 = 120 ° C.), di-t-butyl peroxide (T10 = 124 ° C.); 2,2-azobis (2,4- Dimethylvaleronitrile) (T10 = 51 ° C.), 2,2-azobis (isobutyronitrile) (T10 = 65 ° C.), 2,2-azobis (2-methylbutyro) Such as azo-based polymerization initiator such as tolyl) (T10 = 67 ℃) and the like.

  In the step of producing the precursor, the polymerization temperature varies depending on the raw material (in particular, the 10-hour half-life temperature of the polymerization initiator) and the like, and thus cannot be determined unconditionally, but is usually preferably 65 ° C. or higher. More preferably, it is 70 ° C. or higher, preferably 90 ° C. or lower, and more preferably 85 ° C. or lower. In addition, the polymerization time varies depending on the raw materials and reaction temperature, and thus cannot be determined unconditionally. However, from the viewpoint of increasing the yield of the target product, it is preferably 1.5 hours or longer, and preferably 2 hours or longer. More preferably, it is preferably 6 hours or less, and more preferably 5 hours or less.

  In the step of producing the precursor, the t-butylperoxymethacryloyloxyethyl carbonate is preferably 0.1 parts by weight or more with respect to 100 parts by weight of the monomer component containing styrene or styrene and acrylonitrile. It is more preferably 5 parts by weight or more, and preferably 4 parts by weight or less, more preferably 2 parts by weight or less.

  In the step of producing the precursor, the polymerization initiator is preferably 0.01 parts by weight or more, and 0.05 parts by weight or more with respect to 100 parts by weight of the monomer component containing styrene or styrene and acrylonitrile. More preferably, it is preferably 4 parts by weight or less, and more preferably 2 parts by weight or less.

  Examples of the melt kneading include a method of melting and kneading the precursor using a kneader such as a Banbury mixer, a kneader, a kneading extruder, a twin screw extruder, or a roll. The number of times of kneading may be one or more times. The kneading time varies depending on the size of the kneader to be used, but is usually about 3 to 10 minutes. The discharge temperature of the kneader is preferably 150 to 350 ° C, more preferably 180 to 250 ° C.

  Hereinafter, it describes about the compounding quantity of the polyamide resin composition of this invention.

  The total weight of the polytetrafluoroethylene (B) and the copolymer (C) is 1 to 50 parts by weight with respect to 100 parts by weight of the polyamide resin (A). The total weight of the polytetrafluoroethylene (B) and the copolymer (C) is good in appearance and from the viewpoint of obtaining a polyamide resin molded product having high wear resistance, the polyamide resin (A) It is preferably 5 parts by weight or more, more preferably 10 parts by weight or more, still more preferably 15 parts by weight or more, and preferably 35 parts by weight or less with respect to 100 parts by weight. More preferably, it is 25 parts by weight or less.

  The weight ratio ((B) / (C)) between the polytetrafluoroethylene (B) and the copolymer (C) is 30/70 to 95/5. The viewpoint that the weight ratio ((B) / (C)) of the polytetrafluoroethylene (B) and the copolymer (C) is good in appearance and a polyamide resin molded body having high wear resistance can be obtained. Therefore, it is preferably 40/60 or more, more preferably 80/20 or less, and even more preferably 60/40 or less.

  In addition, various compounding agents can be used for the polyamide resin composition of the present invention. Examples of the compounding agent include ceramic fiber (CF), glass fiber, aramid fiber, potassium titanate fiber, mineral crushed fiber, silica fiber, alumina fiber, stone koji fiber, magnesium hydroxide fiber, silicon carbide fiber, zirconia fiber and the like. Fiber reinforcements: spherical silica, mica, wollastonite, calcium carbonate, kaolin, clay, bentonite, sericite, glass beads, glass flakes, alumina, calcium oxalate, magnesium carbonate, talc, zinc oxide, titanium oxide, oxidation Organic or inorganic fillers in various shapes such as iron, graphite, carbon black, molybdenum disulfide, ultra-high density polyethylene; antioxidants, UV inhibitors, colorants, solid lubricants, antistatic agents, flame retardants, lubricants Etc.

  The resin molding of the present invention can be obtained by molding the polyamide resin composition into a predetermined shape. The molding method is not limited in any way, and examples thereof include injection molding, extrusion molding, and the like, and the heating temperature, pressure, time, etc. of the molding can be appropriately set. Since the polyamide resin molding is excellent in mechanical properties and sliding properties, it can be used in a wide range of fields such as electrical parts, electronic parts, mechanical parts, precision equipment parts, and automobile parts.

  The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples.

<Example 1>
<Production of copolymer (C)>
In a stainless steel autoclave with an internal volume of 5 L, 2800 parts by weight of pure water was added, and 2.5 parts by weight of polyvinyl alcohol was dissolved as a suspending agent. Into this, 700 parts by weight of polyethylene (manufactured by Sumitomo Chemical Co., Ltd., trade name: Sumikasen G806, standard grade) was added and dispersed by stirring.

  Furthermore, as a polymerization initiator, di (3,5,5-trimethylhexanoyl) peroxide (manufactured by NOF Corporation, trade name “Perroyl 355”, 10 hour half-life temperature = 59 ° C.) 5.0 parts by weight And t-butylperoxymethacryloyloxyethyl carbonate (MEC) 9.0 parts by weight in a monomer component consisting of 300 parts by weight of styrene (hereinafter also referred to as “St”), and this solution was added to the above autoclave. It was put in and stirred.

  Next, the above autoclave was heated to 60 to 65 ° C. and stirred for 3 hours to impregnate a polyethylene resin with a radical polymerization initiator, t-butylperoxymethacryloyloxyethyl carbonate, and a monomer component. Subsequently, the temperature of the autoclave was raised to 80 to 85 ° C., and kept at that temperature for 7 hours for polymerization to obtain a precursor (polyethylene resin impregnated with a poly (St / MEC) copolymer). The obtained precursor was cooled, washed with water and dried.

  Further, the obtained precursor was melt-kneaded at 200 ° C. using a lab plast mill single screw extruder (manufactured by Toyo Seiki Seisakusho Co., Ltd.), and subjected to a grafting reaction. C) (graft copolymer) was produced.

<Manufacture of polyamide resin composition>
As the component (A), polyamide resin (manufactured by DuPont Co., Ltd., trade name “Zytel 101L, standard grade) 100 parts by weight, as the component (B-1) of the component (B), polytetrafluoroethylene (Daikin Industries) Co., Ltd., trade name “Polyflon M-12”, standard grade) 14 parts by weight, and as the component (C), 6 parts by weight of the copolymer (C) obtained above was added to a twin-screw extruder (PCM). -30: manufactured by Ikegai) was melt kneaded (extrusion temperature: 250 to 270 ° C.) to obtain a pellet-shaped composition. Next, this pellet was injection-molded (barrel temperature: 260 to 270 ° C., mold temperature: 80 ° C.) to produce a test piece for a predetermined value.

  Using the obtained test pieces, the wear resistance and the molded appearance were evaluated by the following methods. The results are shown in Table 1.

<Evaluation of wear resistance 1 (slidability evaluation by thrust friction wear test)>
About the test piece (evaluation material) obtained above, using a thrust type friction and wear tester (Orientec Co., Ltd., friction and wear tester “EFM-III-F”), the counterpart material ((1) carbon steel The wear amount (mg) with respect to (S45C) or (2) the same material (the same material as the above-mentioned test piece) was measured under the following conditions.
Size of test piece (evaluation material) and mating material: cylinder with inner diameter of 20 mm, outer diameter of 25.6 mm, thickness of 5.6 mm Test conditions (when mating material is (1)): load 50 N, linear velocity 50 cm / sec
Test conditions (when counterpart material is (2)): Load 20N, linear velocity 50cm / sec
Test time: 100 minutes

  In the polyamide resin molded body of the present invention, in the abrasion resistance evaluation 1, when the counterpart material is (1), the abrasion resistance (mg) is preferably 3 mg or less, and preferably 2 mg or less. More preferred. The polyamide resin molded body of the present invention preferably has an abrasion resistance (mg) of 6 mg or less when the counterpart material is (2) in the abrasion resistance evaluation 1.

<Abrasion resistance evaluation 2 (slidability evaluation by reciprocating sliding test)>
Reciprocal sliding tester (Imoto Seisakusho Co., Ltd.) for the test piece (evaluation material) obtained above as an evaluation of wear resistance under high-load sliding conditions rather than the above-mentioned wear resistance evaluation 1. Manufactured by “Rubbing Tester 1566-A”), and the wear amount (mg) with respect to the counterpart material (polyamide resin (manufactured by DuPont, “Zytel 101L (nylon 66)”, polyamide resin not containing additives)) Measured under conditions.
Evaluation material: flat plate having a length of 80 mm, a width of 10 mm, and a height of 4 mm Mating material: a cylindrical material having a diameter of 10 mm and a length of 20 mm Test conditions: load 3 kgf, linear velocity 100 mm / sec, 5000 reciprocations

  In the polyamide resin molded body of the present invention, the abrasion resistance (mg) is preferably 5 mg or less, more preferably 3 mg or less, in the abrasion resistance evaluation 2.

<Evaluation of appearance of molded body>
Regarding the appearance of the molded body, a test piece (150 mm × 100 mm × 2 mm) was visually evaluated according to the following criteria.
○: Good (no flow mark, jetting, peeling, etc.)
X: Defect (existing flow mark, jetting, peeling, etc.)
The flow mark is a defective appearance that forms a circular ripple near the gate of the molded body. Jetting is a poor appearance that allows a flow pattern of a snake-like resin to be formed on a molded body. Peeling means an appearance defect that can be made after the resin has been peeled off from the surface of the molded body.

<Examples 2-14, Comparative Examples 1-6>
<Production of Copolymer (C) and Polyamide Resin Composition>
A copolymer (C) and a polyamide resin composition were produced in the same manner as in Example 1 except that the types and blending amounts of each raw material were changed as shown in Table 1, and Examples 2 to 14 were produced. And the test piece for evaluation of Comparative Examples 1-6 was produced. In Table 1, the component (A-2) is nylon 6 (“Amilan CM1017” manufactured by Toray Industries, Inc.), and the component (A-3) is nylon 66 + 33% glass fiber (manufactured by DuPont, trade name “Zytel”). 70G33L, reinforced grade), (B-2) component is polytetrafluoroethylene ("KTL-610" manufactured by Kitamura Co., Ltd.), and the monomer component AN is acrylonitrile.

  About the test pieces for evaluation of Examples 2 to 14 and Comparative Examples 1 to 6 obtained above, the wear resistance and the molded appearance were evaluated by the above evaluation methods. The results are shown in Table 1.

Claims (2)

A polyamide resin composition comprising a polyamide resin (A), polytetrafluoroethylene (B), and a copolymer (C),
The copolymer (C) is a graft copolymer obtained by reacting polyethylene, styrene, or a monomer component containing styrene and acrylonitrile, and t-butylperoxymethacryloyloxyethyl carbonate, and the polyethylene and the above The weight ratio of the monomer component (polyethylene / monomer component) is 40/60 to 95/5,
The total weight of the polytetrafluoroethylene (B) and the copolymer (C) is 1 to 50 parts by weight with respect to 100 parts by weight of the polyamide resin (A),
The polyamide resin composition, wherein the polytetrafluoroethylene (B) and the copolymer (C) have a weight ratio ((B) / (C)) of 30/70 to 95/5.   A resin molded article obtained from the polyamide resin composition according to claim 1.