WO2021060030A1 - Composition de resine polyamide pour piece coulissante et piece coulissante - Google Patents

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

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Publication number
WO2021060030A1
WO2021060030A1 PCT/JP2020/034549 JP2020034549W WO2021060030A1 WO 2021060030 A1 WO2021060030 A1 WO 2021060030A1 JP 2020034549 W JP2020034549 W JP 2020034549W WO 2021060030 A1 WO2021060030 A1 WO 2021060030A1
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Prior art keywords
polyamide resin
resin composition
thermoplastic elastomer
sliding
group
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PCT/JP2020/034549
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English (en)
Japanese (ja)
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和樹 岩村
信宏 吉村
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東洋紡株式会社
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Priority to JP2020566855A priority Critical patent/JP6872155B1/ja
Priority to CN202080059795.7A priority patent/CN114302916B/zh
Publication of WO2021060030A1 publication Critical patent/WO2021060030A1/fr

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    • 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
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/04—Oxygen-containing compounds
    • C08K5/10—Esters; Ether-esters
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L13/00—Compositions of rubbers containing carboxyl groups
    • 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 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 present invention has the following configuration.
  • 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 ⁇ 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 and heat resistance stability, but also has improved wear resistance and further improved sliding characteristics such as a small change in friction coefficient.
  • 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).
  • an antioxidant D
  • E mold release agent
  • the blending amount of each component is expressed in parts by mass when the total of all resin components of the crystalline polyamide resin (A), the modified polyolefin resin (B), and the thermoplastic elastomer (C) is 100 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 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). )-(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.
  • the components (A) to (E) 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).
  • 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.
  • 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.
  • 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.
  • 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.
  • 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 the 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 ⁇ m or less.
  • 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.

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  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
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  • Polymers & Plastics (AREA)
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Abstract

L'invention concerne une composition de résine polyamide, laquelle présente une excellente aptitude au formage et une excellente stabilité thermique, et laquelle est utilisée de façon adéquate pour la formation d'une pièce coulissante nécessitant d'excellentes caractéristiques de coulissement, plus particulièrement une excellente résistance à l'usure par l'intermédiaire de particules (ci-après "poussière") présentant une grande dureté, et une excellente 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; 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); et un agent de démoulage (E). La résine polyoléfine modifiée (B) et 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/JP2020/034549 2019-09-27 2020-09-11 Composition de resine polyamide pour piece coulissante et piece coulissante WO2021060030A1 (fr)

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JP2020566855A JP6872155B1 (ja) 2019-09-27 2020-09-11 摺動部品用ポリアミド樹脂組成物、及び摺動部品
CN202080059795.7A CN114302916B (zh) 2019-09-27 2020-09-11 滑动部件用聚酰胺树脂组合物及滑动部件

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JP2019177690 2019-09-27

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JPH08157714A (ja) * 1994-12-12 1996-06-18 Toyobo Co Ltd ポリアミド樹脂成形物
WO2008075699A1 (fr) * 2006-12-20 2008-06-26 Toyo Boseki Kabushiki Kaisha Composition de résine à base de polyamide cristallin
JP2012184280A (ja) * 2011-03-03 2012-09-27 Toyobo Co Ltd ポリアミド樹脂組成物

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CN114302916A (zh) 2022-04-08
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