WO2014192766A1 - ゴム強化熱可塑性樹脂組成物及び樹脂成形品 - Google Patents
ゴム強化熱可塑性樹脂組成物及び樹脂成形品 Download PDFInfo
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- WO2014192766A1 WO2014192766A1 PCT/JP2014/064018 JP2014064018W WO2014192766A1 WO 2014192766 A1 WO2014192766 A1 WO 2014192766A1 JP 2014064018 W JP2014064018 W JP 2014064018W WO 2014192766 A1 WO2014192766 A1 WO 2014192766A1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F279/00—Macromolecular compounds obtained by polymerising monomers on to polymers of monomers having two or more carbon-to-carbon double bonds as defined in group C08F36/00
- C08F279/02—Macromolecular compounds obtained by polymerising monomers on to polymers of monomers having two or more carbon-to-carbon double bonds as defined in group C08F36/00 on to polymers of conjugated dienes
- C08F279/04—Vinyl aromatic monomers and nitriles as the only monomers
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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
- C08L51/00—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
- C08L51/04—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers grafted on to rubbers
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- the present invention relates to a rubber-reinforced thermoplastic resin composition and a molded product thereof.
- styrenic resins have a good balance of molding processability and mechanical properties, and are excellent in electrical insulation, so they have been used in a wide range of fields such as the electrical / electronic equipment field and OA equipment field. Yes.
- the shape of molded products has become increasingly complex.
- a weld line is generated in a complicated shape portion or a portion provided with an opening. The generation of the weld line not only causes the appearance defect but also causes a problem in terms of the strength of the product.
- the product may be fully or partially painted.
- the coating process has a problem that the production yield is likely to decrease due to poor coating.
- the design can be colored with a vivid color or deep color, or have a metallic or pearly appearance, etc., with as little coating as possible. Resins that easily impart properties are desired.
- the weld line becomes inconspicuous by raising the mold temperature for the purpose of eliminating the weld line, but because the molten resin is insufficiently cooled, the mold release performance is poor and the mold is removed. Molding defects are likely to occur.
- As a countermeasure in such a case there is a method of increasing the cooling and solidifying time of the molten resin, but there is a problem that the molding cycle becomes long and is not practical.
- the object of the present invention is that, in a conventional molding machine and mold, it is excellent in releasability even if the mold temperature is increased for the purpose of eliminating the weld line, and the occurrence of molding defects due to cavitation is reduced.
- An object of the present invention is to provide a rubber-reinforced thermoplastic resin composition and a molded product thereof.
- the present invention is capable of copolymerizing an aromatic vinyl monomer, a vinyl cyanide monomer, a (meth) acrylic acid ester monomer and other copolymer in the presence of the rubber-like polymer (a).
- a graft copolymer (A) obtained by graft copolymerization of at least one monomer (b) selected from the group consisting of monomers has a dispersed phase as an aromatic vinyl monomer
- vinyl cyanide Copolymer (B) obtained by copolymerizing at least one monomer (b) selected from the group consisting of a monomer, a (meth) acrylic acid ester monomer, and other copolymerizable monomers Is a rubber-reinforced thermoplastic resin composition constituting a continuous phase, a viscosity ( ⁇ 1) at a shear rate of 1 ⁇ 10 1 / sec and a shear rate of 1 ⁇ 10 3 / sec in a capillary rheometer having a tube diameter of 1 mm ⁇
- the rubber-reinforced thermoplastic resin composition of the present invention has a short cooling and solidification time of the molten resin even in the case of obtaining a molded product by increasing the mold temperature for the purpose of eliminating the weld line in the conventional molding machine and mold, Excellent releasability.
- FIG. 1 is a view showing a molded product to be evaluated for releasability.
- the rubber-reinforced thermoplastic resin composition according to the present invention comprises an aromatic vinyl monomer, a vinyl cyanide monomer, and a (meth) acrylate monomer in the presence of the rubber-like polymer (a). And a graft copolymer (A) obtained by graft polymerization of at least one monomer (b) selected from the group consisting of other copolymerizable monomers, the dispersed phase is converted into an aromatic vinyl monomer.
- the copolymer (B) is a rubber-reinforced thermoplastic resin composition constituting a continuous phase.
- the monomer (b) component (Ab component) constituting the graft copolymer (A) includes an aromatic vinyl monomer, a vinyl cyanide monomer, a (meth) acrylate ester monomer, and It contains at least one selected from the group consisting of other copolymerizable monomers, but when other copolymerizable monomers are included, aromatic vinyl monomers and vinyl cyanide monomers are included. It is used in combination with at least one of a monomer and a (meth) acrylic acid ester monomer. That is, the Ab component includes at least one monomer selected from the group consisting of an aromatic vinyl monomer, a vinyl cyanide monomer, and a (meth) acrylic acid ester monomer, and if necessary. And other monomers copolymerizable with the monomer.
- the Ab component may contain two or more monomers selected from the group consisting of aromatic vinyl monomers, vinyl cyanide monomers, and (meth) acrylic acid ester monomers. preferable.
- the monomer (b) component (Bb component) constituting the copolymer (B) is an aromatic vinyl monomer, a vinyl cyanide monomer, or a (meth) acrylic acid ester monomer. And at least one selected from the group consisting of other copolymerizable monomers, but when other copolymerizable monomers are included, aromatic vinyl monomers, vinyl cyanide monomers It is used in combination with at least one of a monomer and a (meth) acrylic acid ester monomer. That is, the Bb component includes at least one monomer selected from the group consisting of an aromatic vinyl monomer, a vinyl cyanide monomer, and a (meth) acrylate monomer, and if necessary. And other monomers copolymerizable with the monomer. Further, the Bb component may contain two or more monomers selected from the group consisting of aromatic vinyl monomers, vinyl cyanide monomers, and (meth) acrylic acid ester monomers. preferable.
- constituting the dispersed phase means forming a phase dispersed in the rubber-reinforced thermoplastic resin composition
- constituting the continuous phase means continuous in the rubber-reinforced thermoplastic resin composition. It means to form the phase that is.
- the rubbery polymer (a) used in the graft copolymer (A) used in the present invention is not particularly limited, but polybutadiene rubber, styrene-butadiene rubber (SBR), styrene-butadiene-styrene (SBS).
- Block copolymer styrene- (ethylene-butadiene) -styrene (SEBS) block copolymer, acrylonitrile-butadiene rubber (NBR), diene rubber such as butyl acrylate-butadiene, butyl acrylate rubber, butadiene-butyl acrylate rubber, acrylic acid 2 -Acrylic rubber such as ethylhexyl-butyl acrylate rubber, 2-ethylhexyl methacrylate-butyl acrylate rubber, stearyl acrylate-butyl acrylate rubber, polyorganosiloxane-butyl acrylate composite rubber, ethylene Propylene rubbers, ethylene - propylene - polyolefin rubber polymer such as diene rubber, silicone rubber polymers such as polyorganosiloxane rubber and the like, which can be used singly or in combination.
- the weight average particle diameter of the rubber-like polymer (a) is not particularly limited, but is preferably 0.05 to 2.0 ⁇ m, and preferably 0.1 to 1.0 ⁇ m from the viewpoint of physical property balance and color developability. It is more preferable.
- aromatic vinyl monomer used in the graft copolymer (A) examples include styrene, ⁇ -methyl styrene, p-methyl styrene, t-butyl styrene, dimethyl styrene, and the like. Can be used. Styrene is particularly preferable as the aromatic vinyl monomer.
- Examples of the vinyl cyanide monomer used in the graft copolymer (A) include acrylonitrile, methacrylonitrile, ethacrylonitrile, and fumaronitrile, and one or more of them can be used.
- acrylonitrile is particularly preferable.
- Examples of the (meth) acrylic acid ester monomer used in the graft copolymer (A) include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, butyl (meth) acrylate, and 2-ethylhexyl.
- phenyl (meth) acrylate 4-t-butylphenyl (meth) acrylate, bromophenyl (meth) acrylate, dibromophenyl (meth) acrylate, 2,4,6-tribromophenyl (meth) acrylate, monochlorophenyl ( A meth) acrylate, a dichlorophenyl (meth) acrylate, a trichlorophenyl (meth) acrylate, etc. can be illustrated and can be used 1 type or 2 or more types.
- the (meth) acrylic acid ester monomer methyl methacrylate is particularly preferable.
- Examples of other copolymerizable monomers used in the graft copolymer (A) include maleimide monomers (eg, N-phenylmaleimide, N-cyclohexylmaleimide, etc.), unsaturated carboxylic acids, The anhydrides (for example, acrylic acid, methacrylic acid, maleic anhydride, etc.), amide monomers (for example, acrylamide, methacrylamide, etc.) and the like can be used. They can be used in combination.
- maleimide monomers eg, N-phenylmaleimide, N-cyclohexylmaleimide, etc.
- unsaturated carboxylic acids unsaturated carboxylic acids
- the anhydrides for example, acrylic acid, methacrylic acid, maleic anhydride, etc.
- amide monomers for example, acrylamide, methacrylamide, etc.
- the polymerization method of the graft copolymer (A) is not particularly limited, and can be produced by a known polymerization method such as emulsion polymerization, suspension polymerization, bulk polymerization, solution polymerization, or a combination thereof.
- the graft ratio of the graft copolymer (A) is preferably 20 to 150% by mass, more preferably 30 to 130% by mass, from the viewpoint of balance of physical properties such as impact resistance, fluidity, and color developability.
- the graft ratio is obtained by forming the acetone-insoluble matter of the graft copolymer (A) into a film and using an infrared spectroscopic analysis device (device name: Spectrum One Perkin Elmer) from the infrared absorption spectrum. It can be calculated by identifying the weight ratio.
- the reduced viscosity of the acetone-soluble portion of the graft copolymer (A) is preferably 0.2 to 1.5 dl / g. 3 to 1.0 dl / g is more preferable.
- the reduced viscosity is obtained by drying the acetone-soluble component, dissolving it in N, N-dimethylformamide to obtain a solution having a concentration of 0.4 g / 100 cc, and then flowing down at 30 ° C. using a Cannon Fenceke type viscosity tube. Can be determined by measuring.
- the content of the total volatile substance at 230 ° C. of the graft copolymer (A) is preferably 0.3 to 2.0% by mass, and 0.4 to 1.6% by mass. Is more preferable.
- the total volatile substance content at 230 ° C. is obtained from the chromatograph obtained by dissolving the graft copolymer (A) in N, N-dimethylformamide and then injecting the solution into gas chromatography. Can do.
- the copolymer (B) used in the present invention comprises an aromatic vinyl monomer, a vinyl cyanide monomer, a (meth) acrylic acid ester monomer, and other copolymerizable monomers. Although it is a copolymer obtained by copolymerizing at least one monomer selected from the group comprising, the monomers used are described as examples used in the graft copolymer (A). The thing similar to a monomer can be used.
- the reduced viscosity of the copolymer (B) that is soluble in acetone is preferably 0.02 to 0.15 dl / g, preferably 0.04 to 0.1 dl / g. g is more preferable.
- the reduced viscosity is determined in the same manner as described above.
- the total volatile substance content at 230 ° C. of the copolymer (B) is preferably 0.1 to 1.2% by mass, and preferably 0.2 to 1.0% by mass. More preferred.
- the content of total volatile substances at 230 ° C. is obtained in the same manner as described above.
- the rubber-reinforced thermoplastic resin composition of the present invention is composed of a graft copolymer (A) that is a dispersed phase and a copolymer (B) that is a continuous phase.
- a rubber-like polymer (a) is 100 mass of rubber-reinforced thermoplastic resin compositions.
- the content is preferably 5 to 25 parts by mass, more preferably 7 to 20 parts by mass.
- the content of the monomer (b) component (Ab component) constituting the graft copolymer (A) is preferably 2 to 60 parts by mass with respect to 100 parts by mass of the rubber-reinforced thermoplastic resin composition. More preferred is 3 to 47 parts by mass.
- the content of the monomer (b) component (Bb component) constituting the copolymer (B) is preferably 15 to 93 parts by mass with respect to 100 parts by mass of the rubber-reinforced thermoplastic resin composition. More preferably, it is 33 to 90 parts by mass.
- the rubber-reinforced thermoplastic resin composition of the present invention has a viscosity ( ⁇ 1) at a shear rate of 1 ⁇ 10 1 / sec and a viscosity ( ⁇ 2) at a shear rate of 1 ⁇ 10 3 / sec in a capillary rheometer having a tube diameter of 1 mm ⁇ . And the viscosity ratio ( ⁇ 1 / ⁇ 2) must be 10 or less.
- the temperature at which the viscosity is measured can set the molding temperature of the rubber-reinforced thermoplastic resin composition.
- the viscosity ratio is preferably 10 or less, and more preferably 9.5 or less.
- the viscosity ratio ( ⁇ 1 / ⁇ 2) is preferably 10 or less at a temperature of 210 ° C., a temperature of 230 ° C., or a temperature of 250 ° C. More preferably, it is 5 or less.
- Volatile substances are generic names for volatile organic substances (VOC) remaining in the resin, and are aromatic hydrocarbons, aliphatic hydrocarbons, cyclic alkanes, terpenes, alcohols, ketones, halogenated hydrocarbons, esters.
- a monomer group remaining in the resin is referred to as a residual monomer
- an oligomer group is referred to as a residual oligomer.
- the residual monomer include solvents and monomers used for polymerization of toluene, ethylbenzene, 1-methylethylbenzene, 1-methylpropylbenzene, styrene, ⁇ -methylstyrene, acrylonitrile, and the like.
- Examples of the residual oligomer include dimers and 3 obtained from monomers used in polymerization, such as styrene dimer, styrene trimer, ⁇ -methylstyrene dimer, styrene-acrylonitrile dimer, and styrene-acrylonitrile trimer. A monomer is mentioned.
- the monomer composition and its addition method are used when each copolymer is polymerized. , Split addition method, continuous addition method, etc.), polymerization temperature (constant temperature polymerization, intermediate temperature rising polymerization, etc.), aging temperature and aging time after polymerization, and further, polymerization catalyst species, addition amount thereof and addition method (collective) Addition method, divided addition method, continuous addition method, etc.), etc., and when the resin composition is kneaded or pelletized, the deaeration process in the extruder or the like is increased, or the vacuum level of deaeration is increased. It is preferable to raise.
- the total volatile substance content at 230 ° C. of the rubber-reinforced thermoplastic resin composition is preferably 0.2 to 1.2% by mass, more preferably 0.25 to 1.0% by mass. preferable.
- the content of total volatile substances at 230 ° C. is obtained in the same manner as described above.
- the rubber-reinforced thermoplastic resin composition of the present invention may contain various additives as necessary, for example, known antioxidants, light stabilizers, lubricants, plasticizers, antistatic agents, colorants, flame retardants, matting agents, A filler, glass fiber, etc. can be added suitably.
- the rubber-reinforced thermoplastic resin composition of the present invention can be used alone, but can also be used by mixing with other thermoplastic resins as necessary.
- other thermoplastic resins include acrylic resins such as polymethyl methacrylate, polycarbonate resins, polybutylene terephthalate resins, polyethylene terephthalate resins, polyamide resins, and polylactic acid resins.
- the rubber-reinforced thermoplastic resin composition of the present invention can be obtained by mixing the above-described components.
- well-known kneading apparatuses such as an extruder, a roll, a Banbury mixer, a kneader, can be used, for example.
- the molded product of the present invention can be obtained by molding the rubber-reinforced thermoplastic resin composition of the present invention by a known molding method such as extrusion molding, injection molding, blow molding and press molding.
- ⁇ Test example> 1.0 part of Sumiplast Black HB (manufactured by Sumitomo Chemical Co., Ltd.) was mixed as a colorant with respect to the graft copolymer (A) and copolymer (B) having the composition ratio shown in Table 1. Using a vented 50 mm single-screw extruder (manufactured by ON Machinery), the mixture was melt-mixed at a cylinder temperature of 210 ° C. and pelletized to obtain black colored pellets.
- each component shown in Table 1 is as follows.
- Rubber-like polymer (a) 93 parts of 1,3-butadiene, 7 parts of styrene, 0.5 parts of n-dodecyl mercaptan, 0.24 of potassium persulfate in a pressure vessel 1 part, 1.5 parts of sodium rosinate, 0.1 part of sodium hydroxide and 150 parts of deionized water were reacted at 70 ° C. for 15 hours, and then cooled to complete the reaction, whereby a rubbery polymer was obtained.
- (A-1) was obtained.
- the obtained rubbery polymer (a-1) was dyed with osmium tetroxide (OsO 4 ), dried, and photographed with a transmission electron microscope.
- OsO 4 osmium tetroxide
- Rubbery polymer (a-2) The rubbery polymer (a-1) obtained above was used to subject the rubber particles to a cohesive enlargement treatment. 270 parts of a rubber-like polymer (a-1) was added to a stirring tank and 0.09 part of a 10% aqueous sodium dodecylbenzenesulfonate solution was stirred for 10 minutes, and then 0.8 part of a 5% aqueous phosphoric acid solution was added over 10 minutes. Added over time. Thereafter, 1 part of a 10% aqueous potassium hydroxide solution was added to obtain a rubbery polymer (a-2). The obtained rubbery polymer (a-2) was measured by the above-mentioned method. As a result, the weight average particle size was 0.25 ⁇ m.
- Graft copolymer (A) In a reactor purged with nitrogen, 48 parts (solid content) of a rubber-like polymer (a-2), 140 parts of water, 0.1 part of ethylenediaminetetraacetic acid disodium salt, 0.001 part of ferrous sulfate, sodium formaldehydesulfoxy After adding 0.3 parts of the rate and heating to 60 ° C., a mixture of 39 parts of styrene, 13 parts of acrylonitrile, 0.6 part of t-dodecyl mercaptan and 0.2 part of cumene hydroperoxide and 1.5 parts of potassium oleate And a mixture of 15 parts of water was added continuously over 4 hours. After completion of the addition, polymerization was further performed at 60 ° C. for 2 hours. Thereafter, the graft copolymer (A) was obtained by salting out, dehydrating and drying.
- a certain amount of the graft copolymer (A) was put into acetone and shaken for 2 hours with a shaker to immerse the graft copolymer. This solution was centrifuged at 15,000 rpm for 30 minutes using a centrifuge, and then dried at room temperature for a whole day and night by vacuum drying to obtain an acetone insoluble matter. The obtained acetone insoluble matter was formed into a film, and the weight ratio of styrene-butadiene rubber, styrene and acrylonitrile was identified from the infrared absorption spectrum using an infrared spectroscopic analyzer (apparatus name: Spectrum One Perkin Elmer). The graft ratio was calculated from the weight ratio of each component.
- the acetone-soluble matter obtained above is dried and then dissolved in N, N-dimethylformamide to obtain a solution having a concentration of 0.4 g / 100 cc.
- the reduced viscosity was determined by measuring the time.
- the graft ratio of the obtained graft copolymer (A) and the reduced viscosity of the acetone-soluble component were 40% and 0.39 dl / g, respectively.
- the graft copolymer (A) was dissolved in N, N-dimethylformamide, the solution was injected into gas chromatography, and the content of total volatile substances at 230 ° C. was measured from the obtained chromatograph. The total volatile content was 0.52%.
- Copolymer (B) AS resin (B-1): Monomer comprising 66.2 parts by weight of styrene, 22.1 parts by weight of acrylonitrile, 11.7 parts by weight of ethylbenzene, 0.20 parts by weight of t-dodecyl mercaptan, and 0.1 parts by weight of perbutyl peroxide in a nitrogen-substituted reactor. The body mixture was continuously fed to carry out the polymerization at 95 ° C. The polymerization liquid was guided from the reactor to a separation and recovery step comprising a preheater and a vacuum tank, and after recovery and extrusion, a copolymer AS resin (B-1) was obtained.
- the reduced viscosity of the obtained copolymer (B-1) and the content of total volatile substances at 230 ° C. was 0.66 dl / g, and the total volatile substances contained The amount was 0.46%.
- AS resin (B-2) Monomer comprising 66.2 parts by weight of styrene, 22.1 parts by weight of acrylonitrile, 11.7 parts by weight of ethylbenzene, 0.40 parts by weight of t-dodecyl mercaptan, and 0.1 parts by weight of perbutyl peroxide in a nitrogen-substituted reactor.
- the body mixture was continuously fed to carry out the polymerization at 95 ° C.
- the polymerization liquid was led from the reactor to a separation and recovery step comprising a preheater and a vacuum tank, and after recovery and extrusion, a copolymer AS resin (B-2) was obtained.
- the reduced viscosity of the obtained copolymer (B-2) and the content of the total volatile substance at 230 ° C. was 0.50 dl / g and the total volatile substance content was The amount was 0.51%.
- AS resin (B-3) Monomer comprising 66.2 parts by weight of styrene, 22.1 parts by weight of acrylonitrile, 11.7 parts by weight of ethylbenzene, 0.55 parts by weight of t-dodecyl mercaptan, and 0.1 parts by weight of perbutyl peroxide in a nitrogen-substituted reactor.
- the body mixture was continuously fed to carry out the polymerization at 95 ° C.
- the polymerization liquid was guided from the reactor to a separation and recovery step comprising a preheater and a vacuum tank, and after recovery and extrusion, a copolymer AS resin (B-3) was obtained.
- the reduced viscosity of the obtained copolymer (B-3) and the content of total volatile substances at 230 ° C. was 0.45 dl / g, and the total volatile substances contained The amount was 0.75%.
- AS resin (B-4) A monomer mixture consisting of 66.2 parts by weight of styrene, 22.1 parts by weight of acrylonitrile, 11.7 parts by weight of ethylbenzene, and 0.20 parts by weight of t-dodecyl mercaptan was continuously fed to the nitrogen-substituted reactor, Polymerization was carried out at 140 ° C. The polymerization liquid was guided from the reactor to a separation and recovery step comprising a preheater and a vacuum tank, and after recovery and extrusion, a copolymer AS resin (B-4) was obtained. As a result of measuring the reduced viscosity of the obtained copolymer (B-4) and the total volatile substance content at 230 ° C. by the above method, the reduced viscosity was 0.66 dl / g and the total volatile substance content was The amount was 1.25%.
- AS resin (B-5) A monomer mixture consisting of 66.2 parts by weight of styrene, 22.1 parts by weight of acrylonitrile, 11.7 parts by weight of ethylbenzene, and 0.40 parts by weight of t-dodecyl mercaptan was continuously fed to the reactor substituted with nitrogen, Polymerization was carried out at 140 ° C. The polymerization liquid was led from the reactor to a separation and recovery step consisting of a preheater and a vacuum tank, and after recovery and extrusion, a copolymer AS resin (B-5) was obtained. As a result of measuring the reduced viscosity of the obtained copolymer (B-5) and the total volatile substance content at 230 ° C. by the above method, the reduced viscosity was 0.50 dl / g and the total volatile substance content was The amount was 1.46%.
- AS resin (B-6) A monomer mixture consisting of 66.2 parts by weight of styrene, 22.1 parts by weight of acrylonitrile, 11.7 parts by weight of ethylbenzene, and 0.55 parts by weight of t-dodecyl mercaptan was continuously fed to the reactor purged with nitrogen, Polymerization was carried out at 140 ° C. The polymerization liquid was led from the reactor to a separation and recovery step consisting of a preheater and a vacuum tank, and after recovery and extrusion, a copolymer AS resin (B-6) was obtained. As a result of measuring the reduced viscosity of the obtained copolymer (B-6) and the total volatile substance content at 230 ° C. by the above method, the reduced viscosity was 0.45 dl / g and the total volatile substance content was The amount was 1.65%.
- Molding was performed using J-150EP manufactured by Nippon Steel Works as a releasable injection molding machine, and a mold of a box-shaped product having a product part size of 150 mm ⁇ 100 mm ⁇ 48 mm as a mold.
- the molded body shown in FIG. The molded body has a thickness of 3 mm, and has three gate portions of site 1, site 2, and site 3, and each site has a shape of 1 mm ⁇ .
- part 5 are site
- the mold temperature when the mold temperature was 70 ° C., the weld line was visually recognized in all samples, but when the mold temperature was 75 ° C., the weld line was hardly visually observed. It was. Therefore, the mold temperature was set to 75 ° C.
- the rubber-reinforced thermoplastic resin compositions of Examples 1 to 3 are excellent in releasability because the cooling and solidification time is short even when the mold temperature is increased for the purpose of eliminating the weld line. .
- the rubber-reinforced thermoplastic resin composition of the present invention is excellent in releasability and shorter cooling and solidification time, particularly when molding at a higher mold temperature for the purpose of eliminating the weld line in conventional molding machines and molds.
- molding defects do not occur due to mold removal, and it can be used in a wide range of fields including the electric / electronic equipment field and the OA equipment field, and is very useful.
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Abstract
Description
本発明に係るゴム強化熱可塑性樹脂組成物は、ゴム状重合体(a)の存在下に芳香族ビニル系単量体、シアン化ビニル系単量体、(メタ)アクリル酸エステル系単量体及びその他の共重合可能な単量体からなる群より選ばれる少なくとも一種の単量体(b)をグラフト重合して得られるグラフト共重合体(A)が分散相を、芳香族ビニル系単量体、シアン化ビニル系単量体、(メタ)アクリル酸エステル系単量体及びその他の共重合可能な単量体からなる群より選ばれる少なくとも一種の単量体(b)を共重合させた共重合体(B)が連続相を構成するゴム強化熱可塑性樹脂組成物である。
表1に示す組成割合のグラフト共重合体(A)及び共重合体(B)に対して、着色剤としてSumiplast Black HB(住友化学株式会社製)を1.0部混合した。ベント付50mm単軸押出機(オーエヌ機械製)を用い、シリンダー温度210℃にて溶融混合し、ペレット化することによって、黒色に着色されたペレットを得た。なお、表1で示す各成分は以下の通りである。
ゴム状重合体(a-1):耐圧容器に、1,3-ブタジエン93部、スチレン7部、n-ドデシルメルカプタン0.5部、過硫酸カリウム0.24部、ロジン酸ナトリウム1.5部、水酸化ナトリウム0.1部及び脱イオン水150部を仕込み、70℃で15時間反応させた後、冷却して反応を終了させることで、ゴム状重合体(a-1)を得た。得られたゴム状重合体(a-1)を、四酸化オスミウム(OsO4)で染色し、乾燥後に透過型電子顕微鏡で写真撮影をした。画像解析処理装置(装置名:旭化成(株)製 IP-1000PC)を用いて1000個のゴム粒子の面積を計測し、その円相当径(直径)を求め、ゴム状重合体(a-1)の重量平均粒子径を算出した。重量平均粒子径は0.10μmであった。
窒素置換した反応器にゴム状重合体(a-2)48部(固形分)、水140部、エチレンジアミン四酢酸二ナトリウム塩0.1部、硫酸第1鉄0.001部、ナトリウムホルムアルデヒドスルホキシレート0.3部を入れ、60℃に加熱後、スチレン39部、アクリロニトリル13部、t-ドデシルメルカプタン0.6部及びキュメンハイドロパーオキサイド0.2部からなる混合物とオレイン酸カリウム1.5部及び水15部からなる混合物を4時間に亘り連続的に添加した。添加終了後さらに60℃で2時間重合した。その後、塩析・脱水・乾燥することでグラフト共重合体(A)を得た。
また、上記で得られたアセトン可溶分を乾燥後、N,N-ジメチルホルムアミドに溶解し、0.4g/100ccの濃度の溶液としたのち、キャノンフェンスケ型粘度管を用い30℃の流下時間を測定することにより還元粘度を求めた。
得られたグラフト共重合体(A)のグラフト率及びアセトン可溶分の還元粘度はそれぞれ40%及び0.39dl/gであった。
AS樹脂(B-1):
窒素置換した反応器にスチレン66.2重量部、アクリロニトリル22.1重量部、エチルベンゼン11.7重量部、t-ドデシルメルカプタン0.20重量部、パーブチルパーオキサイド0.1重量部からなる単量体混合物を連続的に供給して、95℃で重合を行なった。反応器より重合液を予熱器と真空槽より成る分離回収工程に導き、回収、押出後、共重合体AS樹脂(B-1)を得た。上述の方法により、得られた共重合体(B-1)の還元粘度と230℃における総揮発性物質の含有量を測定した結果、還元粘度は0.66dl/g、総揮発性物質の含有量は0.46%であった。
窒素置換した反応器にスチレン66.2重量部、アクリロニトリル22.1重量部、エチルベンゼン11.7重量部、t-ドデシルメルカプタン0.40重量部、パーブチルパーオキサイド0.1重量部からなる単量体混合物を連続的に供給して、95℃で重合を行なった。反応器より重合液を予熱器と真空槽より成る分離回収工程に導き、回収、押出後、共重合体AS樹脂(B-2)を得た。上述の方法により、得られた共重合体(B-2)の還元粘度と230℃における総揮発性物質の含有量を測定した結果、還元粘度は0.50dl/g、総揮発性物質の含有量は0.51%であった。
窒素置換した反応器にスチレン66.2重量部、アクリロニトリル22.1重量部、エチルベンゼン11.7重量部、t-ドデシルメルカプタン0.55重量部、パーブチルパーオキサイド0.1重量部からなる単量体混合物を連続的に供給して、95℃で重合を行なった。反応器より重合液を予熱器と真空槽より成る分離回収工程に導き、回収、押出後、共重合体AS樹脂(B-3)を得た。上述の方法により、得られた共重合体(B-3)の還元粘度と230℃における総揮発性物質の含有量を測定した結果、還元粘度は0.45dl/g、総揮発性物質の含有量は0.75%であった。
窒素置換した反応器にスチレン66.2重量部、アクリロニトリル22.1重量部、エチルベンゼン11.7重量部、t-ドデシルメルカプタン0.20重量部からなる単量体混合物を連続的に供給して、140℃で重合を行なった。反応器より重合液を予熱器と真空槽より成る分離回収工程に導き、回収、押出後、共重合体AS樹脂(B-4)を得た。上述の方法により、得られた共重合体(B-4)の還元粘度と230℃における総揮発性物質の含有量を測定した結果、還元粘度は0.66dl/g、総揮発性物質の含有量は1.25%であった。
窒素置換した反応器にスチレン66.2重量部、アクリロニトリル22.1重量部、エチルベンゼン11.7重量部、t-ドデシルメルカプタン0.40重量部からなる単量体混合物を連続的に供給して、140℃で重合を行なった。反応器より重合液を予熱器と真空槽より成る分離回収工程に導き、回収、押出後、共重合体AS樹脂(B-5)を得た。上述の方法により、得られた共重合体(B-5)の還元粘度と230℃における総揮発性物質の含有量を測定した結果、還元粘度は0.50dl/g、総揮発性物質の含有量は1.46%であった。
窒素置換した反応器にスチレン66.2重量部、アクリロニトリル22.1重量部、エチルベンゼン11.7重量部、t-ドデシルメルカプタン0.55重量部からなる単量体混合物を連続的に供給して、140℃で重合を行なった。反応器より重合液を予熱器と真空槽より成る分離回収工程に導き、回収、押出後、共重合体AS樹脂(B-6)を得た。上述の方法により、得られた共重合体(B-6)の還元粘度と230℃における総揮発性物質の含有量を測定した結果、還元粘度は0.45dl/g、総揮発性物質の含有量は1.65%であった。
各実施例及び比較例で得られた着色ペレットを用いて、以下の評価に供した。その結果を表1にそれぞれ示す。
各実施例及び比較例で得られた着色ペレットをN,N-ジメチルホルムアミドに溶解後、該溶液をガスクロマトグラフィーに注入し、得られたクロマトグラフより、230℃における総揮発性物質の含有量を測定した。
Malvern社製 キャピラリーレオメータ(RH7-D)を用い、D/L=1mm/16mmのキャピラリーを使い測定した。バレル温度は測定樹脂の成形温度230℃に設定した。剪断速度1×101/secの粘度(η1)と、剪断速度1×103/secの粘度(η2)を測定し、その粘度比(η1/η2)を得た。
射出成形機として、日本製鋼所製J-150EP、金型として、製品部寸法が150mm×100mm×48mmの箱状成形品の金型を用いて成形を実施し、図1に示す成形体を得た。成形体は、厚みが3mmであり、部位1、部位2及び部位3の3箇所のゲート部を有し、それぞれの部位は1mmφの形状である。部位4及び部位5は成形体に突き出しピン(エジェクターピン)が当たる部位である。部位4及び部位5において、表面の凹凸が目視で認められる場合は冷却固化時間を延長し、表面の凹凸が目視でほとんど認められない場合の冷却固化時間を記録した。表1には、n=3のうち、最も短い冷却固化時間を記載した。この冷却固化時間が短いほど、離型性が良好であることを示している。
~成形条件~
シリンダー温度設定:230℃
金型温度設定:75℃
射出圧力:120kg/cm2
射出速度:10%
射出時間:5秒
金型:箱状成形品
Claims (3)
- ゴム状重合体(a)の存在下に芳香族ビニル系単量体、シアン化ビニル系単量体、(メタ)アクリル酸エステル系単量体及びその他の共重合可能な単量体からなる群より選ばれる少なくとも一種の単量体(b)をグラフト共重合して得られるグラフト共重合体(A)が分散相を、芳香族ビニル系単量体、シアン化ビニル系単量体、(メタ)アクリル酸エステル系単量体及びその他の共重合可能な単量体からなる群より選ばれる少なくとも一種の単量体(b)を共重合させた共重合体(B)が連続相を構成するゴム強化熱可塑性樹脂組成物であって、1mmφの管径のキャピラリーレオメーターでの剪断速度1×101/secの粘度(η1)と、剪断速度1×103/secの粘度(η2)との粘度比(η1/η2)が、10以下であることを特徴とするゴム強化熱可塑性樹脂組成物。
- 前記ゴム状重合体(a)がジエン系ゴムである、請求項1に記載のゴム強化熱可塑性樹脂組成物。
- 請求項1又は2に記載のゴム強化熱可塑性樹脂組成物から得られた樹脂成形品。
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