WO2021060031A1 - Composition de resine polyamide pour piece coulissante et piece coulissante - Google Patents

Composition de resine polyamide pour piece coulissante et piece coulissante Download PDF

Info

Publication number
WO2021060031A1
WO2021060031A1 PCT/JP2020/034552 JP2020034552W WO2021060031A1 WO 2021060031 A1 WO2021060031 A1 WO 2021060031A1 JP 2020034552 W JP2020034552 W JP 2020034552W WO 2021060031 A1 WO2021060031 A1 WO 2021060031A1
Authority
WO
WIPO (PCT)
Prior art keywords
polyamide resin
resin composition
thermoplastic elastomer
reactive functional
sliding parts
Prior art date
Application number
PCT/JP2020/034552
Other languages
English (en)
Japanese (ja)
Inventor
和樹 岩村
信宏 吉村
宗利 滝田
Original Assignee
東洋紡株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 東洋紡株式会社 filed Critical 東洋紡株式会社
Priority to JP2021548804A priority Critical patent/JPWO2021060031A1/ja
Publication of WO2021060031A1 publication Critical patent/WO2021060031A1/fr

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L15/00—Compositions of rubber derivatives
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/26—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers modified by chemical after-treatment
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L77/00—Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers

Definitions

  • 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.
  • Patent Document 1 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.
  • Patent Document 2 a method of blending a modified polyolefin resin has been proposed.
  • 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.
  • the present invention provides a polyamide resin composition that is suitably used for molding sliding parts that are required to have excellent moldability, heat stability, and toughness, as well as excellent wear resistance and sliding stability.
  • the purpose is.
  • the present inventors have made that the antioxidants and mold release agents added to improve moldability and heat resistance improve the sliding characteristics, and further solid lubrication.
  • the sliding characteristics are improved by adding an agent to a polyamide resin composition to maintain toughness, and have reached the present invention.
  • the present invention has the following configuration.
  • the modified polyolefin resin (B) having a reactive functional group capable of reacting with the terminal group and / or the main chain amide group of the polyamide resin (A) and / or the polyamide resin (A).
  • a thermoplastic elastomer (C) having a reactive functional group capable of reacting with a terminal group and / or a main chain amide group, an antioxidant (D), a mold release agent (E), and a solid lubricant (F).
  • the modified polyolefin resin (B) and / or the thermoplastic elastomer (C) is a polyamide resin composition for sliding parts dispersed in a matrix of the polyamide resin (A) in a domain having a particle size of 5 ⁇ m or less.
  • 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 of the present invention is not only excellent in moldability, heat stability and toughness, but also has improved wear resistance and further improved sliding characteristics such as a small change in friction coefficient. Further, the polyamide resin composition of the present invention can achieve both low wear resistance and low frictional property.
  • 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)) and / or 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).
  • a thermoplastic elastomer (C) (Hereinafter, also referred to as a thermoplastic elastomer (C)), an antioxidant (D), a mold release agent (E), and a solid lubricant (F).
  • the blending amount of each component is when the total of all the resin components of the crystalline polyamide resin (A), the modified polyolefin resin (B), the thermoplastic elastomer (C), and the solid lubricant (F) is 100 parts by mass. Expressed in parts by mass.
  • 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 ⁇ -caprolactam copolymer (6T / 6), trimethylhexamethylenediamine-terephthalic acid polymer (TMD-T), Metaxylylene diamine and adipic acid and isophthalic acid copolymer (MXD-6 / I), trihexamethylened
  • 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.
  • 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 combination 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 ⁇ m 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.
  • 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 combination of two or more.
  • the styrene-based thermoplastic elastomer is not particularly limited, and for example, styrene / butadiene / styrene block copolymer (SBS), styrene / ethylene-butylene / styrene block copolymer (SEBS) which is a hydrogenated product thereof, styrene / butadiene.
  • SBS styrene / butadiene / styrene block copolymer
  • SEBS styrene / ethylene-butylene / styrene block copolymer
  • SBR Styrene
  • HBR hydrogenated styrene / ethylene / butylene copolymer
  • SIS styrene block copolymer
  • SEPS styrene block copolymer
  • 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. ..
  • 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 ⁇ m or less, but is usually all. It is 0.1 to 10% by mass, preferably 1 to 7% by mass with respect to 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 combination 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, and more preferably 0.1 to 0.5 part by mass with respect to 100 parts by mass of the total resin component.
  • 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 combination of two or more.
  • 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 blending amount of the release agent (E) is preferably 0.05 to 1 part by mass, and more preferably 0.1 to 0.8 parts by mass with respect to 100 parts by mass of the total resin component.
  • 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 ⁇ m 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 ⁇ m or less, more preferably 3.5 ⁇ m or less.
  • the lower limit of the particle size is not particularly limited, but from the viewpoint of fluidity, it is preferably 1 ⁇ m or more, and more preferably 2 ⁇ m or more.
  • the solid lubricant (F) contributes to the improvement of surface friction characteristics and has the effect of suppressing the decrease in toughness.
  • the solid lubricant (F) is unique to the present invention. It is considered that the effect is exhibited.
  • the solid lubricant (F) is not particularly limited, but a fluorine-based lubricant and an acrylic-modified polyorganosiloxane are preferable. These may be used alone or in combination of two or more.
  • fluorine-based lubricant examples include tetrafluoroethylene resin (PTFE), perfluoro-alkoxy resin (PFA), tetrafluoroethylene-propylene hexafluoride copolymer resin (FEP), and tetrafluoroethylene-ethylene.
  • PTFE tetrafluoroethylene resin
  • PFA perfluoro-alkoxy resin
  • FEP tetrafluoroethylene-propylene hexafluoride copolymer resin
  • tetrafluoroethylene-ethylene examples include a copolymer resin (ETFE), a vinylidene fluoride resin (PVDF), and an ethylene trifluorochloride resin (PCTFE).
  • PTFE is preferable from the viewpoint of heat resistance, sliding characteristics, and the like.
  • the average particle size of the fluorine-based lubricant is preferably 1 to 200 ⁇ m, more preferably 7 to 100 ⁇ m, and even more preferably 10 to 50 ⁇ m.
  • the average particle size exceeds 200 ⁇ m, the dispersibility of the fluorine-based lubricant in the matrix of the polyamide resin (A) deteriorates, and the mechanical strength of the molded product tends to decrease.
  • the average particle size is less than 1 ⁇ m, the particles of the fluorine-based lubricant tend to cause secondary agglutination, it becomes difficult to mix them uniformly, and the mechanical strength of the molded product tends to decrease.
  • acrylic-modified polyorganosiloxane examples include polyorganosiloxane obtained by graft-copolymerizing at least a (meth) acrylic acid ester.
  • a mixture of 70% by mass or more of the (meth) acrylic acid ester and 30% by mass or less of other copolymerizable monomers is grafted onto the polyorganosiloxane at a mass ratio of 5/95 to 95/5.
  • a polymer is preferable.
  • Examples of the (meth) acrylic acid ester include methyl acrylate, ethyl acrylate, isopropyl acrylate, n-propyl acrylate, n-butyl acrylate, isobutyl acrylate, 2-ethylhexyl acrylate, and isooctyl acrylate.
  • Acrylic acid esters such as n-octyl acrylate, 2-hydroxyethyl acrylate, 2-methoxyethyl acrylate; methyl methacrylate, ethyl methacrylate, isopropyl methacrylate, n-propyl methacrylate, n-butyl methacrylate, methacrylic
  • methacrylic acid esters such as isobutyl acid acid, n-hexyl methacrylate, 2-ethylhexyl methacrylate, n-lauryl methacrylate, 2-hydroxyethyl methacrylate and 2-ethoxyethyl methacrylate. These may be used alone or in combination of two or more. Of these, it is preferable to use methyl methacrylate as at least one component.
  • Examples of the other copolymerizable monomer include styrene compounds such as styrene, vinyltoluene and ⁇ -methylstyrene; unsaturated nitriles such as acrylonitrile and methacrylic nitrile; halogenated compounds such as vinyl chloride and vinylidene chloride.
  • Olefin Olefin; Vinyl esters such as vinyl acetate and vinyl propionate; Unsaturated amides such as acrylamide, methacrylic acid and N-methylol acrylamide; Double bonds such as unsaturated carboxylic acids such as acrylic acid, methacrylic acid and maleic anhydride Examples thereof include polyunsaturated monomers such as ethylene glycol dimethacrylate, propylene glycol dimethacrylate, 1,4-butanediol dimethacrylate, allyl methacrylate, triallyl cyanurate, and triallyl isocyanurate. These may be used alone or in combination of two or more.
  • the average particle size of the acrylic-modified polyorganosiloxane is preferably 1 to 500 ⁇ m, more preferably 10 to 400 ⁇ m, and even more preferably 30 to 350 ⁇ m.
  • the average particle size exceeds 500 ⁇ m, the dispersibility of the acrylic-modified polyorganosiloxane in the matrix of the polyamide resin (A) deteriorates, and the mechanical strength of the molded product tends to decrease.
  • the average particle size is less than 1 ⁇ m, the particles of the acrylic-modified polyorganosiloxane tend to cause secondary agglutination, it becomes difficult to mix them uniformly, and the mechanical strength of the molded product tends to decrease.
  • the blending amount of the solid lubricant (F) is preferably 0.1 to 20% by mass, more preferably 0.5 to 10% by mass, based on 100% by mass of the total resin components. When it is 0.1% by mass or more, wear resistance, sliding stability, and surface lubricity are effectively improved. On the other hand, if it is 20% by mass or less, the mechanical properties of the polyamide resin composition, particularly the toughness, are effectively improved.
  • 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), it is described above (A). )-(F)
  • carbon black, copper oxide, alkali metal halide, light or heat stabilizer, crystal nucleating agent, and charge, which are weather resistance improvers which are blended in the conventional polyamide resin composition.
  • Additives such as inhibitors, pigments, dyes and coupling agents may be added. Further, by blending the filler within the range that does not impair the toughness of the polyamide resin composition, 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 (F). 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.
  • the components (A) to (F) and, depending on the application, 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.
  • sliding parts include bearings, gears, door checkers, chain guide parts, and the like.
  • 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.
  • 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).
  • thermoplastic elastomer (C1) and (C2) were used as the thermoplastic elastomer (C).
  • (D1) and (D2) were used as the antioxidants (D).
  • (E1) to (E3) were used as the release agent (E).
  • (F1) to (F3) were used as the solid lubricant (F).
  • the average particle size was measured by the following method. Each solid lubricant was observed and photographed with a differential interference microscope. Ten particles were arbitrarily selected from the particles in the micrograph, the major axis of the selected particles was measured, and the average value was taken as the average particle size.
  • 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.
  • 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.
  • 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.
  • 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.
  • Examples 1 to 13 a polyamide resin composition having a Charpy impact strength of 6 kJ / m 2 or more, a low amount of wear and a low coefficient of dynamic friction, and both toughness and slidability has been obtained. In addition, the tensile elastic modulus and tensile elongation are not significantly impaired. In Comparative Examples 1 to 3, brittle surface fracture during sliding cannot be suppressed only by the polyolefin resin alloy due to lack of toughness, and the amount of wear is large. In Comparative Examples 4 to 7, although the toughness is sufficient, the tensile elastic modulus is not sufficient, the dust is sunk into the material surface, and is also easily worn, and the sliding modification effect of the polyolefin resin is difficult to work.
  • Comparative Example 8 or 12 is not suitable because it is formulated with an unmodified polyolefin resin or 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 9 to 11 each use an amine-based antioxidant or a fatty acid metal salt, they react with the reactive functional groups of the polyolefin resin or the thermoplastic elastomer to inactivate the reactive functional groups. Therefore, it is not possible to form a finely dispersed domain.
  • Comparative Example 13 contains a solid lubricant, since it is a simple silicone powder, agglomerates are likely to be formed in the polyamide resin composition, which causes brittle fracture at the interface between the silicone powder and the polyamide resin. It becomes easier and the amount of wear is large.
  • a solid lubricant was blended, but since a polyolefin resin or a thermoplastic elastomer was not blended, although the coefficient of dynamic friction was low, brittle fracture could not be suppressed and the amount of wear could not be reduced.
  • FIG. 1 is an image obtained by observing the cross section of Example 2 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 ⁇ m or less.
  • FIG. 2 is an image obtained by observing the cross section of Comparative Example 10 with a differential interference microscope.
  • the above two modifiers are non-uniformly dispersed in the matrix of the polyamide resin, and fine dispersion 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. It is particularly suitable for sliding parts that are required to have excellent wear resistance and sliding stability, and is expected to greatly contribute to the industrial world as an engineering plastic that can be used in a wide range of fields.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

L'invention concerne une composition de résine polyamide, laquelle est excellente en termes d'aptitude au formage, de stabilité thermique et de résistance, et laquelle est utilisée de façon adéquate pour la formation d'une pièce coulissante nécessitant d'excellentes caractéristiques de résistance à l'usure et de stabilité de coulissement. Plus spécifiquement, cette composition de résine polyamide pour pièce coulissante contient: une résine polyamide cristalline (A); une résine polyoléfine modifiée (B) possédant un groupe fonctionnel réactif pouvant réagir avec un groupe terminal de la résine poylamide cristalline (A) et/ou un groupe amide de chaîne principale, et/ou un élastomère thermoplastique (C) possédant un groupe fonctionnel réactif pouvant réagir avec un groupe terminal de la résine poylamide cristalline (A) et/ou un groupe amide de chaîne principale; un antioxydant (D); un agent de démoulage (E); et un lubrifiant solide (F). La résine polyoléfine modifiée (B) et/ou l'élastomère thermoplastique (C) sont dispersés en domaines dont le diamètre de grain est inférieur ou égal à 5 μm dans la matrice de la résine polyamide cristalline (A).
PCT/JP2020/034552 2019-09-27 2020-09-11 Composition de resine polyamide pour piece coulissante et piece coulissante WO2021060031A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2021548804A JPWO2021060031A1 (fr) 2019-09-27 2020-09-11

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2019177711 2019-09-27
JP2019-177711 2019-09-27

Publications (1)

Publication Number Publication Date
WO2021060031A1 true WO2021060031A1 (fr) 2021-04-01

Family

ID=75166645

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2020/034552 WO2021060031A1 (fr) 2019-09-27 2020-09-11 Composition de resine polyamide pour piece coulissante et piece coulissante

Country Status (3)

Country Link
JP (1) JPWO2021060031A1 (fr)
TW (1) TW202116899A (fr)
WO (1) WO2021060031A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007297581A (ja) * 2006-04-06 2007-11-15 Toyobo Co Ltd 強靭性に優れたポリアミド系樹脂組成物及びその成形体
JP2014218574A (ja) * 2013-05-08 2014-11-20 株式会社クラレ ポリアミド樹脂組成物
WO2019098210A1 (fr) * 2017-11-16 2019-05-23 ユニチカ株式会社 Élément coulissant

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007297581A (ja) * 2006-04-06 2007-11-15 Toyobo Co Ltd 強靭性に優れたポリアミド系樹脂組成物及びその成形体
JP2014218574A (ja) * 2013-05-08 2014-11-20 株式会社クラレ ポリアミド樹脂組成物
WO2019098210A1 (fr) * 2017-11-16 2019-05-23 ユニチカ株式会社 Élément coulissant

Also Published As

Publication number Publication date
TW202116899A (zh) 2021-05-01
JPWO2021060031A1 (fr) 2021-04-01

Similar Documents

Publication Publication Date Title
JP3647036B2 (ja) エラストマー強靭化耐摩耗性組成物
US7658387B2 (en) Reinforced elastomeric seal
US20070190284A1 (en) Melt-processable adhesives for bonding pervious fluoropolymeric layers in multilayer composites
KR20040039369A (ko) 열가소성 엘라스토머 조성물 및 그의 제조 방법
JPWO2003022920A1 (ja) ポリエチレン樹脂組成物
JP6800890B2 (ja) 熱可塑性プラスチックと熱可塑性エラストマーとの組み合わせによる熱可塑性エラストマー組成物の硬度設定
KR100300162B1 (ko) 폴리아세탈수지조성물및미끄럼부재
KR100620475B1 (ko) 올레핀계 열가소성 엘라스토머 및 그의 제조 방법,올레핀계 열가소성 엘라스토머 조성물 및 그의 제조 방법및 성형품
US5683818A (en) Method for improving the friction and wear properties of a polyamide and polyproyplene blend
WO2021060031A1 (fr) Composition de resine polyamide pour piece coulissante et piece coulissante
JP2000351889A (ja) 熱可塑性エラストマー組成物及びそれを使用したジョイントブーツ
JP6872155B1 (ja) 摺動部品用ポリアミド樹脂組成物、及び摺動部品
JP2019131722A (ja) 熱可塑性エラストマー組成物及び接合部材
JPWO2005005538A1 (ja) 塩化ビニル系熱可塑性エラストマー組成物
JP2019127528A (ja) 熱可塑性エラストマー組成物
WO2021038974A1 (fr) Composition d'élastomère thermoplastique, élément de liaison et son procédé de production
JP4799763B2 (ja) 冷凍機用シール
JP2980929B2 (ja) 潤滑性ゴム成形体
JP2009270024A (ja) 摺動性を改良した熱可塑性樹脂組成物
KR100554822B1 (ko) 물리적 특성이 개선된 ｐｐ/ｎｂｒ 블렌드계 열가소성탄성체
JP5290653B2 (ja) 摺動性組成物および摺動製品
JPH09316255A (ja) 低硬度ゴム組成物
JP2006117744A (ja) 制振材料
JP4655364B2 (ja) 熱可塑性エラストマー組成物
JP4042192B2 (ja) 樹脂組成物

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 20868390

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2021548804

Country of ref document: JP

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 20868390

Country of ref document: EP

Kind code of ref document: A1