WO2005030869A1 - 熱可塑性エラストマー組成物及び成形物 - Google Patents
熱可塑性エラストマー組成物及び成形物 Download PDFInfo
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- WO2005030869A1 WO2005030869A1 PCT/JP2004/014208 JP2004014208W WO2005030869A1 WO 2005030869 A1 WO2005030869 A1 WO 2005030869A1 JP 2004014208 W JP2004014208 W JP 2004014208W WO 2005030869 A1 WO2005030869 A1 WO 2005030869A1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G69/00—Macromolecular compounds obtained by reactions forming a carboxylic amide link in the main chain of the macromolecule
- C08G69/44—Polyester-amides
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L21/00—Compositions of unspecified rubbers
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- 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
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- 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
- C08L77/02—Polyamides derived from omega-amino carboxylic acids or from lactams thereof
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- 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
- C08L77/06—Polyamides derived from polyamines and polycarboxylic acids
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L71/00—Compositions of polyethers obtained by reactions forming an ether link in the main chain; Compositions of derivatives of such polymers
Definitions
- the present invention relates to a thermoplastic elastomer composition
- a thermoplastic elastomer composition comprising a polyamide polymer or a Z- and polyester-based polymer, and a rubber containing a gel, and in particular, has excellent heat resistance and oil resistance, and furthermore has excellent mechanical properties Is an improved thermoplastic elastomer composition.
- Polyamide-based elastomers and polyester-based elastomers which are multi-block copolymers comprising a polyamide or polyester and a polyether as repeating units, are thermoplastic elastomers having excellent heat resistance and moderate flexibility. It is. However, these elastomers have high hardness to be used as rubber-like elastic materials for various parts.
- thermoplastic rubber obtained by dispersing and mixing a crosslinked rubber component containing 20% or more of a gel component in a polyester elastomer component, which is a rubber crosslinked by a crosslinkable monomer such as a polyfunctional monomer.
- An elastomer composition has been proposed (see Patent Document 1). Specifically, Patent Literature 1 discloses a composition in which a crosslinked carboxy-modified-trilubutadiene rubber is mixed with a polyetherester elastomer using Brabender. However, merely dispersing and mixing the crosslinked rubber in the elastomer does not sufficiently improve the mechanical properties.
- the rubber particles dispersed in the elastomer are formed into a core-shell two-layer structure including a crosslinked rubber core layer and a rubber shell layer having a crosslinkable functional group, and in the presence of a crosslinking agent,
- a method of dispersing and mixing in an elastomer while mainly cross-linking the shell layer has been proposed (see Patent Document 2).
- Patent Document 2 A method of dispersing and mixing in an elastomer while mainly cross-linking the shell layer has been proposed (see Patent Document 2).
- Patent Document 2 A method of dispersing and mixing in an elastomer while mainly cross-linking the shell layer has been proposed (see Patent Document 2).
- the tensile properties and compression set Although it is improved to some extent, its fatigue resistance against bending and constant elongation has not been sufficiently improved.
- Patent document 1 JP-A-5-79256
- Patent Document 2 JP-A-8-231770
- An object of the present invention is to provide a thermoplastic elastomer composition having excellent heat resistance, oil resistance, and mechanical properties, and excellent fatigue resistance against bending and constant elongation. Means for solving the problem
- the inventors of the present invention have conducted intensive studies to solve the above-described problems, and as a result, the gel component was contained at a specific amount or more, and the gel component was dispersed at almost the same concentration from the surface layer to the inside.
- the rubber particles are mixed and dispersed in a polyester-based polymer or a polyamide-based polymer while being further dynamically crosslinked in the presence of a cross-linking agent, whereby the polyamide-based polymer / polyester-based polymer matrix is formed.
- thermoplastic elastomer composition is not only heat-resistant, oil-resistant and mechanically- The inventors have found that they have excellent fatigue resistance against a certain elongation, and have completed the present invention based on these findings.
- thermoplastic elastomer composition obtained by mixing a polyamide polymer (A1) or Z and a polyester polymer (A2) with a rubber (B) in which a gel content of 30% by weight or more is uniformly dispersed, and subjecting to dynamic crosslinking. object.
- thermoplastic elastomer composition according to the above item 1, wherein the rubber (B) has a crosslinkable group.
- thermoplastic elastomer composition according to the above item 2 wherein the crosslinkable group is a functional group capable of crosslinking the rubber (B) by reacting with the crosslinking agent in the presence of the crosslinking agent.
- Rubber (B) force Acrylic rubber, nitrile copolymerized conjugated diene rubber and polyether The thermoplastic elastomer composition according to the above item 1, wherein the thermoplastic elastomer composition is at least one selected from a group consisting of rubber force.
- thermoplastic elastomer composition obtained by molding the thermoplastic elastomer composition according to any one of the above items 15 to 15.
- thermoplastic elastomer composition in which crosslinked rubber particles are finely dispersed in a polyamide polymer or polyester polymer matrix.
- This thermoplastic elastomer composition has excellent properties such as heat resistance, oil resistance, tensile elongation and compression set, and fatigue resistance to bending and constant elongation. Can be suitably used as various rubber parts.
- thermoplastic elastomer one composition of the present invention polyamide-based polymer (A1) or Z and poly ester-based polymer (A2), the gel content of 30 weight 0/0 or homogeneously dispersed rubber (B) Mix
- thermoplastic elastomer composition of the present invention comprises a polyamide polymer (A1) and a polyester polymer (A2
- the rubber (B) used in the present invention is not particularly limited as long as it has rubber elasticity and can be mixed and dispersed in the polyamide polymer (A1) or Z and the polyester polymer (A2).
- conjugated gen rubbers such as natural rubber, isoprene rubber, butadiene rubber, styrene-butadiene copolymer rubber, and acrylonitrile butadiene copolymer rubber; acrylic rubber; Ether rubber; chloroprene rubber; butyl rubber and the like.
- conjugated gen rubber, acrylic rubber, and polyether rubber are preferred from the viewpoints of heat resistance, oil resistance and the like.
- Gen rubber, acrylic rubber and polyether rubber are particularly preferred.
- the nitrile copolymerized conjugated gen rubber includes a, j8-ethylenically unsaturated-tolyl monomer, conjugated gen monomer, and, if necessary, other monomers copolymerizable with these monomers.
- A, ⁇ Ethylenically unsaturated-tolyl monomer is a rubber obtained by copolymerizing and, if necessary, hydrogenating the carbon-carbon unsaturated bond of the main chain.Acrylonitrile, metall-tolyl, ⁇ -mouth acrylonitrile and the like. Of these, acrylonitrile is preferred.
- the content of the nitrile copolymer conjugated diene rubber is preferably 30 to 80 weight 0/0, more preferably 35 to 60 weight 0/0
- Certain conjugated diene monomers include 1,3 butadiene, isoprene, 2,3 dimethyl-1,3-butadiene, 1,3 pentadiene, and the like. Among these, 1,3 butadiene is preferred.
- the acrylic rubber has an acrylate monomer or a methacrylate monomer in a molecule [hereinafter, abbreviated as (meth) acrylate].
- (meth) acrylate Is a polymer containing 50% by weight or more, preferably 60% by weight or more, more preferably 65% by weight or more in the molecule.
- the (meth) acrylate monomer include an alkyl (meth) acrylate monomer and an alkoxyalkyl (meth) acrylate monomer.
- esters of alkinol having 118 carbon atoms with (meth) acrylic acid are preferred.
- ethyl (meth) acrylate and n-butyl (meth) acrylate are preferred! /.
- an ester of an alkoxylated alcohol having 2 to 8 carbon atoms and (meth) acrylic acid is preferred.
- methoxymethyl (meth) acrylate Ethoxymethyl (meth) acrylate, 2-ethoxyethyl (meth) acrylate, 2-butoxyshethyl (meth) acrylate, 2-methoxyethyl (meth) acrylate, ) 2-propoxyshetyl acrylate, 3-methoxypropyl (meth) acrylate, 4-methoxybutyl (meth) acrylate and the like.
- 2-ethoxyethyl (meth) acrylate and 2-methoxyethyl (meth) acrylate are preferable, and 2-ethoxyxyl acrylate and 2-methoxyethyl acrylate are particularly preferable.
- the acrylic polymer obtained by polymerizing the (meth) acrylic acid ester monomer used in the present invention is, in addition to the main structural unit, a monomer unit copolymerizable therewith. It may contain.
- Monomers copolymerizable with the (meth) acrylate monomer include, for example, conjugated diene monomers, non-conjugated diene monomers, aromatic vinyl monomers, a, j8-ethylenic monomers. Examples include unsaturated-tolyl monomers, amide group-containing (meth) acrylic monomers, polyfunctional di (meth) acrylic monomers, and other olefin monomers.
- Examples of the conjugated diene monomer include 1,3-butadiene, butadiene, chloroprene, and piperylene.
- Examples of the non-conjugated diene monomer include 1,2-butadiene, 1,4-pentane, dicyclopentadiene, norbornene, ethylidene norbornene, 1,4-hexadiene and norbornadiene.
- Examples of the aromatic vinyl monomer include styrene, ⁇ -methylstyrene, dibutylbenzene, and the like.
- Examples of the a, j8-ethylenically unsaturated-tolyl monomer include acrylonitrile and methacrylonitrile.
- amide group-containing (meth) acrylic monomer examples include acrylamide and methacrylamide.
- Other olefin monomers include ethylene, propylene, vinyl chloride, vinylidene chloride, vinyl acetate, ethyl vinyl ether, butyl vinyl ether and the like.
- the polyether rubber is not particularly limited as long as it is a rubber having a main structural unit of an oxyalkylene repeating unit obtained by ring-opening polymerization of an oxysilane monomer.
- the type of the oxysilane monomer is not particularly limited, but the polyether rubber used in the present invention preferably contains an ethylene oxide monomer unit.
- Ethylene oxide simple substance Body unit the content of the polyether in the rubber, based on all the repeating units of the polyether rubber, preferably 15 70 mol 0/0, more preferably 20 - 65 mole 0/0, and particularly preferably 25 60 Mo %.
- the polyether rubber preferably contains an oxysilane monomer unit copolymerizable with ethylene oxide.
- the oxysilane monomer copolymerizable with ethylene oxide include alkylene oxides such as propylene oxide, aryl glycidyl ether, and epihydric hydrin.
- rubber (B) used in the present invention the gel fraction containing 30 wt 0/0 above, the gel content is uniformly dispersed in the rubber (B), characterized by Rukoto.
- the gel component is a crosslinked product of rubber (B) .Rubber (B) is mixed with polyamide polymer (A1) or Z and polyester polymer (A2) and mixed in the presence of a crosslinking agent.
- This is a component that has already been crosslinked before dynamic crosslinking.
- the gel component in the rubber (B) is already cross-linked and is a component that is insoluble in a good solvent for the rubber. Therefore, its content can be measured by the following method. That is, a predetermined amount of the rubber (B) is weighed, the solution obtained by dissolving the rubber (B) in a good solvent for the rubber is filtered through a filter such as a wire mesh, and the solvent insoluble matter captured on the filter is removed. It is measured by measuring.
- the content of the gel component in the rubber is 30% by weight or more, more preferably 50% by weight or more, and particularly preferably 60% by weight or more. If the content of the gel component in the rubber is too small, the crosslinking efficiency after the dynamic crosslinking reaction becomes insufficient, and as a result, the dispersed particle size of the rubber dispersed in the polyamide polymer and the polyester polymer matrix becomes large. In some cases, adverse effects such as deterioration of mechanical properties may occur.
- the upper limit of the content of the gel component in the rubber is not particularly limited, but is usually about 90% by weight.
- the gel component present in the rubber in an amount of 30% by weight or more is uniformly dispersed in the rubber).
- the gel component is uniformly dispersed in the rubber (B)
- the rubber (B) is mixed and dispersed in the polyamide polymer (A1) or Z and the polyester polymer (A2) in the form of particles.
- the gel content is substantially the same both inside the rubber (B) particles and in the surface layer. That is, from the surface layer portion of the rubber (B) particles from the gel component to the inside, It means that it is present at an almost constant concentration. Therefore, even if the gel component is scattered in the rubber (B) particles, it is included in the scope of the present invention as long as its content is almost the same from the surface layer portion to the inside.
- the core-shell two-layer structure in which the gel exists only in the portion and the gel does not exist in the surface portion is not included in the scope of the present invention.
- the gel component is uniformly dispersed in the rubber (B)
- the crosslinking efficiency at the time of dynamic crosslinking is higher than that of the core-shell rubber.
- the dispersed particle size of the rubber (B) in the matrix of the polyamide-based polymer (A1) or polyester-based polymer (A2) is reduced, and the mechanical properties and the fatigue resistance are improved. Is obtained.
- the rubber (B) used in the present invention preferably has a crosslinkable group for forming a gel component.
- the crosslinkable group for forming the gel component is not limited as long as it is a group capable of crosslinking the polymer chain of the rubber (B), but is preferably a group capable of crosslinking without the presence of a crosslinking agent. No.
- a monomer having the crosslinkable group may be copolymerized into the rubber (B).
- a monomer having a crosslinkable group include a polyfunctional monomer having two or more vinyl groups. Specific examples thereof include dibutylbenzene, 1,3,5-tributyl and the like.
- Polyfunctional buryl compounds such as benzene; diaryl compounds such as diaryl phthalate and diaryl fumarate; polyfunctional acrylates such as trimethylolpropane triatalylate and ethylene dalcol dimethatalylate; and the like.
- the amount of the monomer having a crosslinkable group is preferably based on the total amount of the monomers used for the polymerization of the rubber (B). 0.2 to 1.5% by weight, more preferably 0.3 to 1.0% by weight.
- the monomer amount having a crosslinkable group in the above range even without crosslinking agent is present, the gel of the rubber) in generated by the polymerization reaction is 30 wt 0/0 above.
- the rubber (B) of the present invention further has a crosslinkable group for dynamic crosslinking so as to be efficiently crosslinked by dynamic crosslinking described in detail below.
- This crosslinkable group for dynamic crosslinking reacts with the crosslinking agent in the presence of a crosslinking agent described later. It is preferably a functional group capable of crosslinking the rubber (B).
- a crosslinkable group may be any functional group generally known to be capable of reacting with the crosslinking agent, and may be appropriately selected depending on the type of the crosslinking agent used and the like.
- Such a crosslinkable group is particularly preferably at least one selected from the group consisting of a halogen-containing group, an epoxy group and a carboxyl group.
- the monomers having these crosslinkable groups are added to the above-mentioned monomers used for the polymerization at the time of polymerization of the rubber (B). Mixing and polymerization by a known method.
- the monomer having such a crosslinkable group include the following.
- Examples of the monomer having a halogen-containing group include halogen-containing butyl ethers such as 2-chloroethyl butyl ether; halogen-containing styrene derivatives such as chloromethylstyrene; halogen-containing butyl acetates such as vinyl acetate; Epihalohydrin such as piclorhydrin and mobihydrin in the mouth of ebibu; and the like.
- epoxy group-containing monomer examples include aryl glycidyl ether and glycidyl methacrylate.
- carboxyl group-containing monomer examples include organic acids such as acrylic acid, methacrylic acid, itaconic acid, fumaric acid, and maleic acid; monoalkyl esters of butenedioic acid such as monobutyl maleate ester and monobutyl fumarate; Butenedioic acid monocycloalkyl esters such as alkyl esters and fumaric acid monocycloalkyl esters;
- the amount of these monomers having a crosslinkable group for dynamic crosslinking is preferably 0.5 to 10% by weight, more preferably 0.5 to 10% by weight of all the monomers used for the polymerization of the rubber (B). Preferably, it is 1.0-5.0% by weight.
- the amount of the monomer having a crosslinkable group for dynamic crosslinking is too small, adverse effects such as impairment of rubber dispersibility due to insufficient crosslinking during dynamic crosslinking occur, and conversely, If the amount is too large, there is an adverse effect such that the rubber cannot be produced stably in the rubber production process.
- the rubber (B) used in the present invention may be used in combination with the above-mentioned monomer (monomer forming a nitrile copolymerized conjugated rubber, an acryl rubber, a polyether rubber, etc.), and preferably a gel fractionation. It can be obtained by polymerizing a monomer having a crosslinkable group for formation or Z and a monomer having a crosslinkable group for dynamic crosslinking by a known polymerization method. Specifically, nitrile copolymerization The role rubber and acrylic rubber can be obtained by emulsion polymerization, and the polyether rubber can be obtained by solution polymerization or solvent slurry polymerization.
- a crosslinkable group for forming a gel component is introduced into the rubber (B) by using a monomer having a crosslinkable group for forming a gel component, the crosslinking for forming the gel component is performed. At least a part of the functional groups are already cross-linked before dynamic cross-linking, and form a gel component.
- a crosslinkable group for dynamic crosslinking is introduced into the rubber (B) using a monomer having a crosslinkable group for dynamic crosslinking
- a crosslinking agent described in detail below is used. The use allows efficient dynamic cross-linking.
- the above-mentioned monomer is used as a monomer having a crosslinkable group for forming a gel component, and the content of the monomer is within the above-mentioned predetermined range, whereby the cross-linking is performed. Even without adding an agent, at least a part of the crosslinkable group for forming the gel component can be cross-linked, and the gel component can be 30% by weight or more.
- a crosslinkable group for dynamic crosslinking preferably, a crosslinkable group which reacts by adding the above-mentioned crosslinking agent is introduced, whereby the rubber (B) is dynamically crosslinked with a crosslinking agent-added cadmium. Can be performed efficiently.
- the polyamide-based polymer (A1) used in the present invention is not limited as long as it is a polymer having an acid amide bond (-CONH-). In the present invention, it is generally used as a polyamide resin. It is preferable to use a polyamide polymer.
- a polymer obtained by polycondensation of diamine and dibasic acid a polymer obtained by polycondensation of diamine derivative such as diformyl and dibasic acid, dibasic acid derivative such as dimethyl ester Polymer obtained by the polycondensation of diamine with diamine, polymer obtained by the reaction of di-tolyl or diamide with formaldehyde, polymer obtained by weight-adhesion of diisocyanate and dibasic acid, amino acid Or a polymer obtained by self-condensation of a derivative thereof, a polymer obtained by ring-opening polymerization of ratatum, and the like.
- These polyamide polymers contain a polyether polymer block or the like as a copolymer component.
- polyamide polymers include polycapramide (6-nylon), polyhexamethylene adipamide (6,6-nylon), and polyhexamethylene sebacamide (6,10-nylon). mouth ), Polydecaneamide (11-nylon), poly- ⁇ -aminoheptanoic acid (7 nylon), and poly- ⁇ aminononanoic acid (9 nylon).
- 6-nylon, 6,6-nylon, 11-nylon and the like are preferable from the viewpoints of versatility and heat resistance.
- the polyamide-based polymer (A1) has a melting point of preferably 215 to 265 ° C, more preferably 215 to 230 ° C, and a tensile strength at break of preferably 35 MPa or more, more preferably 60 MPa or more. Those having MPa or more are preferably used.
- Polyester-based polymer (A2) [0034] Polyester-based polymer (A2)
- the polyester-based polymer (A2) used in the present invention is obtained by polycondensation of a polyhydric alcohol and a polybasic acid, and is not limited as long as it is a polymer having an ester bond.
- polyester resins such as alkyd resin, maleic acid resin and unsaturated polyester resin can be used. These polyester resins can be obtained by reacting a polyester having an unsaturated double bond obtained by polycondensation of a polyhydric alcohol and a polybasic acid with a vinyl conjugate.
- polyhydric alcohol ethylene glycol, diethylene glycol, triethylene glycol, butylene glycol, propylene glycol and the like are used.
- polybasic acid phthalic acid, fumaric acid, adipic acid and the like are used.
- aromatic polyester resins such as polyethylene terephthalate and polybutylene terephthalate using ethylene alcohol and butylene calendar as polyhydric alcohol and phthalic acid as polybasic acid are used.
- polyester polymers may contain a polyether polymer block or the like as a copolymer component.
- the polyester polymer (A2) has a melting point of preferably 170 to 250 ° C, more preferably 210 to 230 ° C, and a tensile strength at break of preferably 40 MPa or more, more preferably Those having a pressure of 50 MPa or more are preferably used.
- thermoplastic elastomer composition of the present invention is obtained by mixing the above-mentioned polyamide-based polymer (A1) or Z and the polyester-based polymer (A2) with a rubber (B) and subjecting them to dynamic crosslinking. Manufactured.
- the dynamic crosslinking means mixing the rubber (B) with the polyamide-based polymer (A1) or Z and the polyester-based polymer (A2), and mixing the rubber (B) with the polyamide-based polymer (A1) or Z and It means that the rubber (B) is crosslinked in the presence of a crosslinking agent while being dispersed in the polyester polymer (A2).
- a crosslinking agent while being dispersed in the polyester polymer (A2).
- the polyamide-based polymer (A1) or Z and the polyester-based polymer (A2) and the rubber (B) are mixed with a batch such as Brabender or Labo Plastomill.
- Examples thereof include a method of crosslinking a crosslinkable group for dynamic crosslinking of the rubber (B) while mixing while applying shear by using a continuous kneader such as a twin kneader or a twin kneader.
- a continuous kneader such as a twin kneader or a twin kneader.
- the rubber (B) is mixed and dispersed, and the crosslinkable group for dynamic crosslinking of the rubber (B) is bridged, whereby the mechanical strength and bending of the obtained thermoplastic elastomer composition are reduced. Improved fatigue resistance to constant elongation.
- a crosslinking agent for dynamically crosslinking a crosslinking group for dynamic crosslinking of the rubber (B) a crosslinking agent generally used as a crosslinking agent for rubber is used. Although it can be used, it is preferable to use the following depending on the type of the crosslinkable group for dynamic crosslinking of the rubber (B).
- crosslinkable group for dynamic crosslinking when the crosslinkable group for dynamic crosslinking is a functional group having a carbon-carbon unsaturated bond such as a vinyl group, examples thereof include a sulfur-based crosslinking agent and an organic peroxide-based crosslinking agent.
- examples thereof include a metal rock sulfur-based vulcanizing agent and a triazine-based vulcanizing agent.
- crosslinkable group for dynamic crosslinking is an epoxy group
- examples thereof include an organic ammonium-based crosslinking agent and a polyacid-based crosslinking agent.
- crosslinkable group for dynamic crosslinking is a carboxyl group
- examples thereof include a polyvalent amine-based crosslinking agent and a diisocyanate-based crosslinking agent.
- the mixing ratio of the polyamide polymer (A1) or Z and the polyester polymer (A2) and the rubber (B) at the time of dynamic crosslinking is determined by the polyamide polymer weight.
- the amount of the crosslinking agent used is preferably 0.1 to 2 parts by weight based on a total of 100 parts by weight of the polyamide polymer (A1), the polyester polymer (A2) and the rubber (B). 0.0 parts by weight, more preferably 0.5 to 1.0 parts by weight. If the amount of the crosslinking agent is too small, crosslinking during dynamic crosslinking does not proceed sufficiently, and dispersibility of the rubber (B) in the polyamide polymer (A1) and / or the polyester polymer (A2) is poor. If it is too large, adverse effects such as acceleration of decomposition of the polyamide polymer (A1) and the polyester polymer (A2) may occur.
- the method of dynamic crosslinking may be a general dynamic crosslinking method, but is preferably by the following method.
- the rubber (B) is masticated, and then, while the polyamide polymer (A1) or Z and the polyester polymer (A2) are heated and melted, the masticated rubber (B) is heated. Mix and disperse with the molten polyamide polymer (A1) or Z and polyester polymer (A2). When the rubber (B) is sufficiently finely dispersed in the matrix of the polyamide-based polymer (A1) or the polyester-based polymer (A2), the crosslinking agent is added and kneaded.
- Examples of the kneaders used for kneading include batch kneaders such as Brabender and Labo Plastomill; continuous kneaders such as a single screw extruder and a twin screw extruder; The kneading machine used can be used. Further, these may be used in combination.
- the kneading temperature is preferably from 220 to 270 ° C, more preferably from 230 to 250 ° C. If the kneading temperature is too low, adverse effects such as insufficient melting of the polyamide polymer (A1) and the polyester polymer (A2) occur, and if too high, adverse effects such as thermal deterioration of the rubber (B) occur. May occur.
- the crosslinking agent is preferably provided by providing an addition hole in the middle of the extruder barrel.
- thermoplastic elastomer composition of the present invention obtained by the above-mentioned method may be a filler such as carbon black or silica as long as the effects of the present invention are not impaired; a plasticizer; a lubricant; A compounding agent generally compounded with rubber resin may be used.
- thermoplastic elastomer composition of the present invention obtained by the above method can be formed into an arbitrary shape. It can be molded into a molded product and used for rubber parts. Rubber parts include sealing parts such as shaft seals and bearing seals; hose parts such as air duct hoses, fuel hoses, and oil hoses; and rubber parts related to automobiles such as constant velocity joint boots and rack-and-pion boots. It is suitable as.
- Rubber parts include sealing parts such as shaft seals and bearing seals; hose parts such as air duct hoses, fuel hoses, and oil hoses; and rubber parts related to automobiles such as constant velocity joint boots and rack-and-pion boots. It is suitable as.
- the gel content in the rubber (B) was measured by measuring the proportion of the solvent-insoluble component when the rubber (B) was dissolved in a good solvent. Specifically, about 0.2 g of the rubber (B) is weighed, dissolved in methyl ethyl ketone, and the obtained solution is filtered through a filter such as a wire mesh. Measure the weight of the insoluble matter trapped in the filter after removing the solvent, and increase the ratio of the insoluble matter to the total weight of the dissolved rubber by ten times.
- thermoplastic elastomer composition of the present invention is formed into a 2 mm-thick sheet by a press machine preheated to 250 ° C., and a test piece is punched into a predetermined shape. Using this test piece, tensile strength and tensile elongation at break were measured in accordance with the tensile test of JIS K6251.
- the same test piece as the test piece for which the tensile strength and the tensile elongation at break were measured in the above (2) was aged for 168 hours in an environment of 150 ° C for aging by air heating, and the aged test piece was used. Then, the tensile strength and the tensile elongation at break were measured again by the above method, and the amount of change in these physical properties before and after heat aging (change in tensile strength: ⁇ , change in tensile elongation at break: ⁇ ) was measured. The closer these changes are to 0, the better the heat resistance.
- test piece prepared in the above (2) was immersed in an IRM903 test oil at 150 ° C for 70 hours, and the volume change rate was measured. The smaller the volume change rate, the more oil resistant Excellent.
- a test piece for measuring compression set was prepared, and the compression set was measured at a compression rate of 20% and a compression condition of 120 ° C and 70 hours.
- the value of the compression set is preferably as small as possible.
- test piece punched into a prescribed shape was stretched by half of the elongation at break and then returned to the 0% stretched state at 300 rpm, and the number of times until the test piece broke was measured. By doing so, the fatigue resistance to repeated repeated stretching was evaluated. The greater the number of breaks, the better the fatigue resistance.
- the obtained latex was coagulated with an aqueous solution of calcium salt and washed with water and dried to obtain an acrylic rubber (B1).
- the gel content of the acrylic rubber (B1) was 80%, and its mu-viscosity (ML, 100 ° C) was 45. Also, the obtained Atari
- the formed sample was pressed into a sheet having a thickness of 2 mm by pressing with a press machine preheated to 250 ° C to obtain a formed body. Then, the obtained molded body was evaluated by the above method. The results are shown in Table 1.
- Acrylic rubber B1 was used except that the composition of the monomer mixture used for polymerization was changed to 47 parts of ethyl acrylate, 50 parts of n-butyl acrylate, 1 part of ethylene glycol dimethaphthalate, and 2 parts of glycidyl methacrylate. Polymerization was performed by the same operation to obtain an acrylic rubber (B2).
- the acrylic rubber (B2) has a gel content of 75% and a viscosity of 100 (ML, 100 ° C) of 40.
- the obtained acrylic rubber (B2) had a substantially uniform cross-linking reaction from the surface layer to the inside of the particles, and was dispersed at a substantially constant gel component. .
- cross-linking agent 2 2-methylimidazole
- Example 2 Using a monomer mixture consisting of 34 parts of acrylonitrile, 67 parts of butadiene, 2 parts of methacrylic acid and 1 part of dibutylbenzene, emulsification was carried out in the same manner as in Example 1, except that the polymerization reaction temperature was 10 ° C. Polymerization was performed to obtain a latex of carboxyl group-containing acrylonitrile 'butadiene rubber (NBR). The obtained carboxyl group-containing NBR is hydrogenated using palladium acetate catalyst to give a carboxyl group-containing hydrogenated acrylonitrile with a hydrogenation rate of 95%. Butadiene rubber (B3; carboxyl group-containing HNBR) was obtained. The gel content of the obtained rubber (B3) was 85%, and its viscosity (ML, 100 ° C) was 80. In addition, the obtained carboki
- a monomer mixture consisting of 49 parts of ethyl acrylate, 50 parts of n-butyl acrylate and 1 part of ethylene glycol dimethaphthalate is emulsion polymerized to form an acrylic rubber core. Latex was obtained. Then, in the presence of 127.2 parts of the core latex, 200 parts of ion-exchanged water, 48 parts of ethyl acrylate, 50 parts of n-butyl acrylate and 2 parts of monomethyl fumarate were charged, followed by degassing under reduced pressure and nitrogen replacement.
- a core-shell rubber (B4) having an acrylic rubber shell layer on the surface of an acrylic rubber core.
- the obtained core-shell rubber (B4) had a shell layer in an uncrosslinked state and a core gel content of 60%.
- the viscosity was 100 (ML, 100 ° C).
- Example 2 Except for using the core shell rubber B4 in place of the acrylic rubber B2, mixing and dispersion and dynamic crosslinking were carried out in the same manner as in Example 2, and then molded to obtain a sheet-like molded body. Then, the obtained molded body was evaluated in the same manner as in Example 1. The results are shown in Table 1.
- Comparative Example 2 Mixing, dispersion and dynamics were performed in the same manner as in Example 1 except that the kneading of the acrylic rubber Bl and the polyamide polymer (Al) was performed at 230 ° C for 10 minutes using a Labo Plastomill without using a crosslinking agent. Cross-linking was carried out, followed by molding to obtain a sheet-like molded body. Then, the obtained molded body was evaluated in the same manner as in Example 1. The results are shown in Table 1.
- Crosslinking agent 1 Hexamethylene diamine carnomate
- Crosslinking agent 2 2-methylimidazole
Abstract
Description
Claims
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JP2005514241A JP4765628B2 (ja) | 2003-09-29 | 2004-09-29 | 熱可塑性エラストマー組成物及び成形物 |
DE602004025128T DE602004025128D1 (de) | 2003-09-29 | 2004-09-29 | Thermoplastische elastomerzusammensetzung und formkörper |
US10/574,013 US20070072998A1 (en) | 2003-09-29 | 2004-09-29 | Thermoplastic elastomer composition and shaped product |
EP04788275A EP1672027B1 (en) | 2003-09-29 | 2004-09-29 | Thermoplastic elastomer composition and formed article |
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US (1) | US20070072998A1 (ja) |
EP (1) | EP1672027B1 (ja) |
JP (1) | JP4765628B2 (ja) |
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JPWO2006003972A1 (ja) * | 2004-06-30 | 2008-04-17 | 日本ゼオン株式会社 | 熱可塑性エラストマー組成物及びその成形品 |
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Also Published As
Publication number | Publication date |
---|---|
CN1860177A (zh) | 2006-11-08 |
US20070072998A1 (en) | 2007-03-29 |
JPWO2005030869A1 (ja) | 2006-12-07 |
DE602004025128D1 (de) | 2010-03-04 |
JP4765628B2 (ja) | 2011-09-07 |
EP1672027A4 (en) | 2006-10-04 |
EP1672027B1 (en) | 2010-01-13 |
EP1672027A1 (en) | 2006-06-21 |
CN100467533C (zh) | 2009-03-11 |
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