WO2000060000A1 - Composition a base d'elastomere thermoplastique pour moulage a partir de poudres, poudre tiree de cette composition et procede de moulage utilisant cette poudre - Google Patents

Composition a base d'elastomere thermoplastique pour moulage a partir de poudres, poudre tiree de cette composition et procede de moulage utilisant cette poudre Download PDF

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Publication number
WO2000060000A1
WO2000060000A1 PCT/JP2000/001956 JP0001956W WO0060000A1 WO 2000060000 A1 WO2000060000 A1 WO 2000060000A1 JP 0001956 W JP0001956 W JP 0001956W WO 0060000 A1 WO0060000 A1 WO 0060000A1
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Prior art keywords
powder
thermoplastic elastomer
elastomer composition
weight
parts
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PCT/JP2000/001956
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English (en)
Japanese (ja)
Inventor
Kohsuke Ohtani
Yoshihiro Nakatsuji
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Sumitomo Chemical Company, Limited
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Publication of WO2000060000A1 publication Critical patent/WO2000060000A1/fr

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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
    • 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
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not 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
    • 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
    • C08L53/00—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
    • C08L53/02—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers of vinyl-aromatic monomers and conjugated dienes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
    • C08L9/06—Copolymers with styrene

Definitions

  • thermoplastic elastomer composition for powder molding, powder thereof, and molding method using the powder
  • the present invention relates to a thermoplastic elastomer composition for powder molding, a thermoplastic elastomer composition powder, and a molding method using the powder. More specifically, the present invention provides a thermoplastic elastomer composition for powder molding capable of lowering the molding temperature and obtaining a molded article having excellent flexibility, a powder thereof, and a composition using the powder. It relates to the shape method. Background art
  • a sheet-like molded body having a complex uneven pattern such as a leather grain or a stitch on the surface is used as a skin material for an automobile interior part and the like.
  • a molded product obtained by powder-forming a powder obtained by pulverizing an olefin thermoplastic elastomer has been proposed as an alternative to the conventional molded product of biel chloride-based resin.
  • JP-A-5-550 and JP-A-7-82433 In the powder molding technology using such a thermoplastic elastomer, a lower molding temperature is required from the viewpoint of shortening the molding cycle.
  • many molded products, including automotive interior parts are required to have improved flexibility.
  • a method of improving flexibility a method of compounding a large amount of a rubber component is known. However, when a large amount of the rubber component is blended, there is a problem that the molding temperature becomes high. Disclosure of the invention
  • the problem to be solved by the present invention is to provide a thermoplastic elastomer composition for powder molding, which can lower the molding temperature and obtain a molded article having excellent flexibility.
  • An object of the present invention is to provide a thermoplastic elastomer composition powder using the composition and a molding method using the powder. That is, the present invention contains the following (a) 100 parts by weight, (b) 5 to 300 parts by weight, and (c) 1 to 200 parts by weight, and has a complex dynamic viscosity at 250 of 7 * (1).
  • the present invention relates to a thermoplastic elastomer composition for powder molding which has a force of 0.5 ⁇ 10 5 or less and a Newton viscosity index n of 0.67 or less.
  • thermoplastic elastomer composition powder containing the above thermoplastic elastomer composition.
  • the present invention relates to a method for molding the above-mentioned thermoplastic elastomer composition powder and a molded article obtained by powder molding.
  • the component (a) used in the present invention is a polyolefin resin.
  • the polyolefin-based resin is at least one selected from crystalline polymers or copolymers obtained by polymerizing or copolymerizing one or more types of olefins.
  • the olefin include those having 2 to 8 carbon atoms, such as ethylene, propylene, 1-butene, 1-hexene, and 1-octene.
  • Examples of the component (a) include polypropylene, a copolymer of propylene as a main component and ⁇ -olefin other than propylene, poly (1-butene), high-pressure polyethylene, low-pressure polyethylene, chain-like.
  • Examples include low-density polyethylene, ethylene- ⁇ -olefin copolymer, ethylene-vinyl acetate copolymer, and ethylene-methacrylic acid copolymer.
  • the hydrogenated aromatic vinyl compound-conjugated diene compound copolymer of the component (b-1) used in the present invention is obtained by hydrogenating an aromatic vinyl compound-conjugated diene compound copolymer rubber.
  • a hydrogenated product of an aromatic vinyl compound-conjugated gen compound block copolymer rubber is preferable, and a known product can be used.
  • aromatic vinyl compound as the component (b-1) examples include styrene, hexamethylstyrene, p-methylstyrene, bierxylene, monochlorostyrene, dichlorostyrene, monobromostyrene, ethylstyrene, and vinylnaphthylene.
  • styrene is preferred from the viewpoint of industrialization.
  • conjugated diene compound of the component (b-1) examples include butadiene, isoprene, 2,3-dimethyl-1,3-butadiene, 2-neopentyl-1,3-butane, and 2-chloro-1,3.
  • the component (b-2) used in the present invention is an ethylene-vinyl olefin copolymer rubber.
  • the ethylene- ⁇ -olefin copolymer rubber include a well-known ethylene- ⁇ -olefin copolymer rubber and an ethylene-olefin-non-conjugated copolymer rubber.
  • Examples of the ⁇ -olefin in the ethylene- ⁇ -olefin copolymer rubber include propylene, 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-octene and 1-decene.
  • ⁇ -olefin of the formula 3-10 is mentioned, and among them, propylene is preferable.
  • Examples of the non-conjugated gen include non-conjugated gens such as 1,4-hexadiene, dicyclopentene, and 5-ethylidene-2-norbornene.
  • an ethylene-propylene copolymer rubber is preferable from the viewpoint of low-temperature impact properties.
  • the component (b) used in the present invention is at least one of the above (b-1) and (b-2).
  • the ratio of (b-1) Z (b-2) is not particularly limited.
  • the component (c) used in the present invention is at least one selected from the group consisting of petroleum resins, waxes and terpene resins.
  • the petroleum resin is a low-molecular-weight thermoplastic hydrocarbon resin derived from a cracked petroleum fraction, and a known resin can be used. There is no problem even if the petroleum resin has been subjected to treatment such as hydrogenation to improve odor and color.
  • Both natural and synthetic waxes can be used. Heaven Natural waxes are paraffin wax, which is a solid wax at normal temperature, separated and purified from vacuum distilled distillate oil, and microcrystalline, which is a wax solid at normal temperature, separated and purified from vacuum distillation residue oil or heavy distillate oil. Wax is given. Others include animal waxes, vegetable waxes, and mineral waxes. These natural waxes may be modified by an addition reaction or a substitution reaction. Synthetic waxes include Fischer-Tropsch wax synthesized from natural gas by the Fischer-Tropsch method, and polyethylene wax.
  • the terpene resin is a resin having a molecular weight of about several hundreds to several thousands obtained by polymerizing terpenes such as hemiterpenes, monoterpenes, sesquiterpenes, and diterpenes. In addition, those to which hydrogenation and other compounds are added for improving heat resistance and the like are also included.
  • (C) is preferably a solid at room temperature from the viewpoint of handling properties.
  • thermoplastic elastomer composition of the present invention contains (a) 100 parts by weight, (b) 5 to 300 parts by weight and (c) 1 to 200 parts by weight, Preferably, (b), which contains (a) 100 parts by weight, (b) 100 to 200 parts by weight, and (c) 5 to 100 parts by weight, is obtained when the content of (b) is too small.
  • the flexibility of the molded article is inferior.
  • meltability of the thermoplastic elastomer composition is inferior. If (c) is too small, the meltability of the thermoplastic elastomer composition is not sufficiently improved, while if it is too large, the mechanical strength of the obtained molded article is poor.
  • the thermoplastic elastomer composition of the present invention may contain, if necessary, other rubber components such as a butadiene copolymer and an isoprene copolymer in addition to the essential components (a) to (c). Alternatively, a hydrogenated product thereof, or a styrene-based thermoplastic elastomer may be added. Further, it is also possible to carry out a crosslinking reaction by adding a peroxide, if necessary. Furthermore, if necessary, an antioxidant, a heat stabilizer, a UV absorber, a lubricant, an antistatic agent, a pigment, a filler, a flame retardant, a mineral oil-based softener, a foaming agent, and a foaming aid may be added. Good.
  • thermoplastic elastomer of the present invention examples include a method of melt-kneading with a single-screw extruder, a twin-screw extruder, or the like.
  • the thermoplastic elastomer composition of the present invention has a complex dynamic viscosity at 250 of 77 * (1) of not more than 1.5 ⁇ 10 5 Vois, preferably not more than 5 ⁇ 10 3 Vois, more preferably 3 X 10 3 Boise or less.
  • the lower limit of 77 * (1) is usually 1 ⁇ 10 boys, preferably 3 ⁇ 10 boys, more preferably 1 ⁇ 10 2 boys.
  • the complex dynamic viscosity 7 * ( ⁇ ) measured at 250 at the vibration frequency ⁇ is the storage modulus G ′ ( ⁇ ) and the loss modulus G ′′ measured at 250 at the vibration frequency ⁇ . This is a value calculated based on equation (1) using ( ⁇ ).
  • thermoplastic elastomer composition of the present invention has a neuton viscosity index ⁇ calculated from the following formula (2) of 0.67 or less, preferably 0.01 to 0.3, particularly preferably: 0.03 to 0.25.
  • thermoplastic elastomer composition of the present invention is used for powder molding as a thermoplastic elastomer composition powder. It is preferably used. Examples of a method for obtaining the powder include a known pulverizing method, a strand cutting method, a die face cutting method, and a solvent treatment method.
  • the powder of the present invention preferably has an average particle size of 1.2 mm or less and a bulk specific gravity of 0.30 g Zc c or more. If the average particle size is too large or the bulk specific gravity is too small, pinholes may easily occur in the molded product obtained by the powder molding method.
  • the thermoplastic elastomer composition powder of the present invention comprises: (d) a fine powder having an average particle diameter of 10 Di or less per 100 parts by weight of the thermoplastic elastomer composition powder; It may be used as a blend in which parts are blended. As a result, the effect that the bulk specific gravity of the thermoplastic elastomer composition powder increases can be obtained.
  • the bulk specific gravity is a value measured according to JIS-6721.
  • the thermoplastic elastomer composition powder is obtained by, for example, a method of grinding the thermoplastic elastomer composition at a temperature equal to or lower than its glass transition point (hereinafter, referred to as a freeze grinding method). Further, a method of subjecting the powder to a solvent treatment to form a spheroid (hereinafter referred to as a solvent treatment method; see, for example, Japanese Patent Application Laid-Open No. 62-280226), a method of thermally melting a thermoplastic elastomer composition, This is extruded from a die to form a strand, and then the strand is taken out or drawn while being stretched, and cut after cooling (hereinafter referred to as a strand force method.
  • thermoplastic elastomer composition is hot-melted and cut immediately after a die outlet while extruding the same into water from a die (hereinafter, referred to as a die face cut method).
  • a die face cut method a method in which a thermoplastic elastomer composition is hot-melted and cut immediately after a die outlet while extruding the same into water from a die.
  • thermoplastic elastomer composition When the thermoplastic elastomer composition is produced by a freeze pulverization method, it is usually produced by pulverizing a thermoplastic elastomer composition at a low temperature not higher than the glass transition temperature. For example, a freeze grinding method using liquid nitrogen is suitably used.
  • the thermoplastic elastomer composition pellets cooled to 170 or less, preferably to 190 or less can be obtained by a mechanical grinding method using an impact mill such as a ball mill. Crushing at a temperature higher than 170 is not preferred because the particle size of the pulverized thermoplastic elastomer composition becomes coarse and the powder formability decreases.
  • a method that generates less heat and has a high pulverization efficiency is preferable. Further, it is preferable that the milling device itself is cooled by external cooling.
  • the thermoplastic elastomer composition When produced by a solvent treatment method, the thermoplastic elastomer composition is pulverized at a temperature below its glass transition point, usually at 170 or less, preferably at 190 or less, and then subjected to solvent treatment.
  • the solvent treatment refers to a method in which the pulverized thermoplastic elastomer composition is stirred in a medium having low compatibility with the dispersing agent and the emulsifier while being stirred at a temperature higher than the melting temperature of the thermoplastic elastomer composition.
  • it is a method of heating to a temperature 30 to 5 higher than the melting temperature to form a spheroid, then cooling and taking out.
  • Examples of the medium in the solvent treatment include ethylene glycol, polyethylene glycol, and polypropylene glycol.
  • the amount of the medium used is not particularly limited, but is preferably 300 parts by weight per 100 parts by weight of the thermoplastic elastomer used. 0 to 100 parts by weight, more preferably 400 to 800 parts by weight.
  • Examples of the dispersing agent include ethylene-acrylic acid copolymer, citric anhydride, titanium oxide and the like.
  • the amount of the dispersing agent is usually 5 to 20 parts by weight based on 100 parts by weight of the thermoplastic elastomer used. And preferably in the range of 10 to 15 parts by weight.
  • agent examples include, but are not limited to, polyoxyethylene sorbitan monolaurate, polyethylene glycol monolaurate, and sorbitan tristearate. It is usually in the range of 3 to 15 parts by weight, preferably 5 to 10 parts by weight, based on 100 parts by weight of the stoma.
  • the discharge diameter of the die is usually in the range of 0.1 to 3 mm, preferably 0.2 to 2 mm, and the discharge speed from the die is usually 0.1 to 5 kg Z hour hole, Preferably in the range of 0.5 to 3 kg Z hour hole, the take-off speed of the strand is usually in the range of 1 to 10 OmZ, preferably in the range of 5 to 5 Om / "min.
  • Cutting after cooling The length is usually at most 1.4 mm, preferably at most 1.2 mm.
  • the discharge diameter of the die is usually in the range of 0.1 to 3 mm, preferably 0.2 to 2 mm, and the discharge speed from the die is usually 0.1 to 5 kg. It is preferably in the range of 0.5 to 3 kg Z hour Z hole.
  • D Fine particles having an average particle size of 10 m or less per 100 parts by weight of the thermoplastic elastomer powder produced by the freeze-pulverization method, the solvent treatment method, the strand cutting method, and the die face cutting method.
  • pellets produced by a freeze-pulverization method, a solvent treatment method, a strand cut method, and a die face cut method are sometimes referred to as pellets.
  • thermoplastic elastomer composition powder of the present invention is used in a powder molding method.
  • the thermoplastic elastomer composition powder of the present invention may be molded into a powder.
  • the powder molding method include a fluid immersion method, an electrostatic coating method, a powder spraying method, a powder rotation method, and a powder slush molding method.
  • a powder molding method including all the following steps can be given. Monkey
  • First step a step of supplying the above-mentioned thermoplastic elastomer composition powder of the present invention onto a molding surface of a mold heated to a melting temperature of the thermoplastic elastomer composition or higher.
  • Second step a step of heating the powder obtained in the first step on the molding surface of the first step for a predetermined time and fusing powders whose surfaces have at least been melted together.
  • Third step A step of collecting the unfused powder after a lapse of a predetermined time in the second step
  • Fourth step If necessary, a step of further heating the mold on which the molten powder is placed.
  • Fifth step After the fourth step, cool the mold, and mold the shaped body into a mold. Removal process
  • Examples of the method for heating the mold include a gas heating furnace method, a heating medium oil circulation method, a dipping method in heating medium oil or hot fluidized sand, and a high-frequency induction heating method.
  • the mold temperature when the powder is heat-sealed to the mold is usually in the range of 150 to 300, preferably 190 to 270.
  • the time from supply of the powder onto the molding surface to removal of the powder is not particularly limited, and is appropriately selected depending on the size and thickness of the target compact.
  • thermoplastic elastomer composition powder containing a foaming agent a foam having excellent flexibility can be produced.
  • the thermoplastic elastomer composition powder of the present invention containing a foaming agent may be foamed after powder molding.
  • a foaming agent a pyrolytic foaming agent is usually used.
  • a pyrolytic foaming agent include azodicarbonamide, 2,2'-azobisisobutyronitrile, diazodiaminobenzene, and the like.
  • thermoplastic elastomer composition powder containing a foaming agent As a method of producing a thermoplastic elastomer composition powder containing a foaming agent, a method of mixing a foaming agent with the thermoplastic elastomer composition powder, a decomposition temperature of the thermoplastic elastomer composition, and the like. It can be obtained by kneading a foaming agent in advance and then pulverizing it. In addition, a foaming aid, a cell adjuster, and the like may be mixed with the foaming agent.
  • a molded product obtained by molding the thermoplastic elastomer composition powder of the present invention is useful as a skin material, but a two-layer molded product in which a foam layer is laminated on one surface side is used as the skin material. Is also good.
  • Such a two-layered molded article can be integrally produced by a powder molding method (see Japanese Patent Application Laid-Open No. 5-4733, etc.), or a separately produced foam is adhered to the molded article obtained above. It can also be manufactured by a method of bonding with an agent or the like.
  • thermoplastic elastomer composition powder is supplied onto the molding surface of the mold, and the powders are thermally fused to each other to obtain a sheet-like molten material on the molding surface.
  • the powder is removed, and then a powder of a thermoplastic polymer composition containing a foaming agent is supplied on the sheet-like melt, and the powders are thermally fused to each other to form a sheet-like melt on the molding surface.
  • excess powder that has not been heat-sealed may be removed, and then heated and foamed to form a foamed layer.
  • non-foamed layers may be the same or different.
  • foaming agent examples include the same pyrolytic foaming agents as described above.
  • thermoplastic polymer composition containing such a foaming agent include, for example, a vinyl chloride resin, a polyolefin, and an olefin thermoplastic elastomer.
  • a polyethylene foamable composition used in JP-A-7-228720 can also be used.
  • a polyurethane foam can be used as the foam layer.
  • the adhesiveness between the thermoplastic elastomer composition and the polyurethane tends to be inferior.
  • the adhesiveness can be improved by pretreating the adhesive surface of the molded article with a primer such as chlorinated polyethylene.
  • the polyurethane foam is fixed at a predetermined position with a predetermined gap between the molded article and a core material described later, and a mixture of polyol and polyisocyanate is injected into the gap and foamed under pressure. It is formed by doing.
  • thermoplastic elastomer composition powder of the present invention is formed into a compact by powder molding.
  • thermoplastic resin core material is laminated on one surface side of the molded article.
  • thermoplastic resin core material is laminated on the foam layer side of the two-layer molded article.
  • a method for producing such a molded article there can be mentioned a method for producing a two-layer molded article in which a thermoplastic resin melt is supplied to one surface side of the molded article and pressure-cooled.
  • a method for producing a three-layered molded body in which a thermoplastic resin melt is supplied to the foam layer side of the two-layered molded body and then cooled under pressure can be mentioned.
  • the molded article or the two-layer molded article obtained by powder molding the composition powder of the present invention is preferably used as a skin material laminated on a thermoplastic resin core material. It can be used for a multilayer molded article in which a thermoplastic resin core material is laminated on the side, and a two-layer molded article can be used for a multilayer molded article in which a thermoplastic resin core material is laminated on the foamed layer side. it can.
  • thermoplastic resin in the thermoplastic resin core material for example, a thermoplastic resin such as polyolefin such as polypropylene and polyethylene, and an ABS (acrylonitrile-butadiene-styrene) copolymer resin is used. Among them, polyolefins such as polypropylene are preferably used.
  • thermoplastic resin melt is supplied to one surface side of the molded article, and a method of pressurizing or supplying the thermoplastic resin melt to the foam layer side of the two-layer molded article, It can be easily manufactured by a pressurizing method.
  • thermoplastic resin melt is a thermoplastic resin that is heated to a temperature higher than its melting temperature and is in a molten state.
  • the supply of the thermoplastic resin melt may be performed before the pressurization, or may be performed simultaneously with the pressurization.
  • the pressing may be performed using a mold or the like, or may be performed by the supply pressure of the thermoplastic resin melt.
  • molding method include an injection molding method, a low-pressure injection molding method, and a low-pressure compression molding method. Specifically, for example, when the above-described molded body is used as a skin material, the molded body is supplied between a pair of opened molds, and then, one surface side of the molded body and one surface facing the molded body.
  • thermoplastic resin melt it is sufficient to clamp both molds after or while supplying the thermoplastic resin melt between the molds.
  • a pair of opened molds is used. After the two-layer molded body is supplied, and then the thermoplastic resin melt is supplied between or while the foamed layer of the molded body and one of the molds facing the molded body, the two molds are clamped.
  • the opening and closing directions of the two dies are not particularly limited, and may be a vertical direction or a horizontal direction.
  • the powder molded die is placed on the molding surface of the molded product or the two-layer molded product. It can also be used as one of the molds in the production of the multilayer molded body while holding it. According to this method, the molded article or the two-layer molded article onto which the pattern of the mold has been transferred is supplied between the molds without being separated from the mold. The desired multilayer molded body can be obtained without breaking down.
  • the thermoplastic resin melt may be supplied after the completion of the mold clamping of both the dies, but a multilayer molded body having a small displacement of the molded body or the two-layer molded body as the skin material and an improved degree of pattern transfer is obtained. In view of this, it is preferable to clamp both dies while supplying or after supplying both dies while they are not closed.
  • the method for supplying the thermoplastic resin melt is not particularly limited.
  • the thermoplastic resin melt can be supplied from a resin passage provided in one of the molds facing the molded product or the two-layer molded product.
  • the molten resin may be supplied by inserting a supply nose of the molten resin between the two dies, and thereafter, the supply nose may be retracted out of the system to close both the dies.
  • the outer peripheral surface of one die and the inner peripheral surface of the other die can slide A suitable pair of male and female molds can also be used.
  • a multilayer molded body having an extra skin material at its ends can be obtained.
  • a multilayer molded body whose end is covered with the skin material layer can be obtained.
  • the olefin thermoplastic elastomer composition of the present invention can be optimally used for automobile parts, industrial equipment parts, electric / electronic parts, building materials, miscellaneous goods, etc. by utilizing its excellent characteristics.
  • automobile parts it can be used as a skin material for interior parts such as instrument panels, doors, and leaflets.
  • thermoplastic elastomer composition was performed by the following method.
  • the storage modulus G '( ⁇ ) and the loss modulus G "( ⁇ ) were measured at a vibration frequency of 1 radian per second and 100 radian per second using a Rheometrics Dynamic Analyzer-1 (Model 105-7700).
  • the complex dynamic viscosity (1) and ⁇ ? * (100) were calculated by the above formula (1) The measurement was performed in a parallel plate mode, an applied strain of 5%, and a temperature of 250. Further, Newtonian viscosity index ⁇ was determined by the above equation (2) using * (1) and 7? * (100).
  • a nickel metal mold (30 cm x 30 cm, thickness 3 mm) having a grain pattern on the molding surface was heated to the temperature shown in Table 1, and about 1 kg of the powder obtained above was sprinkled on the molding surface.
  • Table 1 shows the results.
  • thermoplastic elastomer powder [Production of thermoplastic elastomer powder]
  • thermoplastic elastomer composition powder passeded through a 32 mesh standard sieve.
  • silica Grade No. X, manufactured by Dedasa
  • alumina silica Grade JC-30, manufactured by Mizusawa Chemical Co., Ltd.
  • the mixture was mixed at room temperature for 2 minutes at 1500 rpm using an L Super Mixer to obtain a thermoplastic elastomer powder containing fine powder. Powder slush molding was performed using the thermoplastic elastomer powder.
  • the complex dynamic viscosity ⁇ (1) and (100) were calculated by the above formula (1) using the above formula (1), where the measurement was performed in a parallel plate mode, an applied strain of 5%, and a temperature. Further, the Newtonian viscosity index n was determined by the above equation (2) using ⁇ * (1) and 7? * (100), and the results are shown in Table 1.
  • thermoplastic elastomer composition powder was kneaded at 180 with a twin-screw extruder to obtain pellets of a thermoplastic elastomer composition.
  • the pellets were cooled to 120 ° C. using liquid nitrogen, and then powdered while maintaining the cooling state to obtain a thermoplastic elastomer composition powder (passed through a standard sieve with a mesh of 32 mesh).
  • Subsequent mixing of the fine powder and production of a molded body by the slush molding method were performed in the same procedure as in Example 1. /? * (1), Newtonian viscosity index n was determined in the same procedure as in Example 1. Table 1 shows the results.
  • Example 1 Comparative Example 2 Slash 25 o ⁇ ⁇
  • thermoplastic elastomer composition for powder molding capable of lowering the molding temperature and obtaining a molded article having excellent flexibility
  • thermoplastic elastomer using the composition It is possible to provide an elastomer composition powder, a powder molding method, a molded article, and a method for producing a molded article.

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Abstract

L'invention concerne une composition à base d'élastomère thermoplastique pour moulage à partir de poudres, qui comprend 100 % en poids de l'ingrédient a) ci-dessous; 5 à 300 % en poids de l'ingrédient b) ci-dessous; et 1 à 200 % en poids de l'ingrédient c) ci-dessous, et présente, à 250 °C, une viscosité dynamique complexe θ*(1) d'au plus 1,5x105 P et un indice de viscosité newtonienne n d'au plus 0,67. Lesdits ingrédients sont: a) une résine polyoléfinique; b) au moins un élément sélectionné dans le groupe constitué par b-1) des copolymères d'un composé vinylique aromatique hydrogéné et d'un composé de diène conjugué; b-2) des élastomères de copolymère d'éthylène-α-oléfine; et c) au moins un élément sélectionné dans le groupe constitué par des résines de pétrole, des cires et des résines terpéniques. La composition de l'invention peut être moulée à basse température pour produire un moulage d'une excellente souplesse. Cette composition est utilisée pour obtenir une poudre d'une composition à base d'élastomère thermoplastique.
PCT/JP2000/001956 1999-03-31 2000-03-29 Composition a base d'elastomere thermoplastique pour moulage a partir de poudres, poudre tiree de cette composition et procede de moulage utilisant cette poudre WO2000060000A1 (fr)

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JP9298799 1999-03-31
JP11/92987 1999-03-31

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109943005A (zh) * 2018-08-21 2019-06-28 广西沙沙岛实业有限公司 弹性颗粒及其制备方法和应用

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0479580A2 (fr) * 1990-10-03 1992-04-08 Sumitomo Chemical Company, Limited Procédé pour le moulage à poudre utilisant de poudre en elastomère thermoplastique
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EP0479580A2 (fr) * 1990-10-03 1992-04-08 Sumitomo Chemical Company, Limited Procédé pour le moulage à poudre utilisant de poudre en elastomère thermoplastique
JPH0796532A (ja) * 1993-09-29 1995-04-11 Mitsui Petrochem Ind Ltd シボ模様付熱可塑性エラストマーパウダースラッシュ成形体
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JPH08109289A (ja) * 1994-10-13 1996-04-30 Sumitomo Chem Co Ltd 粉末成形用の熱可塑性エラストマーパウダー組成物、その製造方法、それを用いる粉末成形方法及びその成形体
WO1997000911A1 (fr) * 1995-06-20 1997-01-09 Sumitomo Chemical Company, Limited Composition elastomere thermoplastique et articles moules a partir de cette composition

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CN109943005A (zh) * 2018-08-21 2019-06-28 广西沙沙岛实业有限公司 弹性颗粒及其制备方法和应用
CN109943005B (zh) * 2018-08-21 2020-05-26 广西沙沙岛实业有限公司 弹性颗粒及其制备方法和应用
US10844214B2 (en) 2018-08-21 2020-11-24 Guangxi Sisland Industrial Co. Ltd Elastic particle and preparation method thereof

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