WO2017154736A1 - 合成ゴムのラテックスおよびその製造方法 - Google Patents
合成ゴムのラテックスおよびその製造方法 Download PDFInfo
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
- C08L9/10—Latex
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J109/00—Adhesives based on homopolymers or copolymers of conjugated diene hydrocarbons
- C09J109/10—Latex
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- 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
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/40—Mixing liquids with liquids; Emulsifying
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/40—Mixing liquids with liquids; Emulsifying
- B01F23/41—Emulsifying
- B01F23/4105—Methods of emulsifying
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/50—Circulation mixers, e.g. wherein at least part of the mixture is discharged from and reintroduced into a receptacle
- B01F25/52—Circulation mixers, e.g. wherein at least part of the mixture is discharged from and reintroduced into a receptacle with a rotary stirrer in the recirculation tube
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/27—Mixers with stator-rotor systems, e.g. with intermeshing teeth or cylinders or having orifices
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- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/02—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
- C08J3/03—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media
- C08J3/07—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media from polymer solutions
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- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/02—Direct processing of dispersions, e.g. latex, to articles
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
- C08K5/0025—Crosslinking or vulcanising agents; including accelerators
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- 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
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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
- C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
- C08L9/06—Copolymers with styrene
- C08L9/08—Latex
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
- C09J7/38—Pressure-sensitive adhesives [PSA]
- C09J7/381—Pressure-sensitive adhesives [PSA] based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
- C09J7/383—Natural or synthetic rubber
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- A—HUMAN NECESSITIES
- A41—WEARING APPAREL
- A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
- A41D13/00—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches
- A41D13/05—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches protecting only a particular body part
- A41D13/08—Arm or hand
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- A—HUMAN NECESSITIES
- A41—WEARING APPAREL
- A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
- A41D19/00—Gloves
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F2215/00—Auxiliary or complementary information in relation with mixing
- B01F2215/04—Technical information in relation with mixing
- B01F2215/0409—Relationships between different variables defining features or parameters of the apparatus or process
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/40—Mixing liquids with liquids; Emulsifying
- B01F23/41—Emulsifying
- B01F23/413—Homogenising a raw emulsion or making monodisperse or fine emulsions
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2309/00—Characterised by the use of homopolymers or copolymers of conjugated diene hydrocarbons
- C08J2309/06—Copolymers with styrene
- C08J2309/08—Latex
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2309/00—Characterised by the use of homopolymers or copolymers of conjugated diene hydrocarbons
- C08J2309/10—Latex
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/005—Additives being defined by their particle size in general
Definitions
- the present invention relates to a latex of synthetic rubber capable of providing a film molded body such as a dip molded body having excellent mechanical stability and excellent tensile strength and elongation, and a method for producing the same.
- a latex composition containing latex of natural rubber is dip-molded to obtain a dip-molded body that is used in contact with a human body such as a nipple, a balloon, a glove, a balloon, and a sack.
- natural rubber latex contains a protein that causes allergic symptoms in the human body
- synthetic rubber latex such as synthetic polyisoprene and styrene-isoprene-styrene block copolymer instead of natural rubber latex (Patent Document 1).
- Patent Document 1 discloses a latex of a synthetic polyisoprene and / or a styrene-isoprene-styrene block copolymer having a weight average molecular weight of 10,000 to 5,000,000, a sulfur-based vulcanizing agent and a vulcanizing agent.
- a dip molding composition containing a sulfur accelerator is disclosed.
- the mechanical stability of the latex used for obtaining this is not sufficient, so that the storage stability as latex is low, and rubber is used in the post-process.
- the present invention has been made in view of such a situation, and is a latex of a synthetic rubber that can provide a film molded body such as a dip molded body having excellent mechanical stability and excellent tensile strength and elongation. And it aims at providing the manufacturing method.
- the present inventors have found that the content of particles having a particle size of 5 ⁇ m or more in the particle size distribution determined on the basis of the number of synthetic rubber particles contained in the latex is as follows: The inventors have found that the above object can be achieved by a synthetic rubber latex controlled to less than 3,000 ppm by weight, and have completed the present invention.
- the content of particles of synthetic rubber latex having a particle size of 5 ⁇ m or more in a particle size distribution determined on the basis of the number of synthetic rubber particles contained in the latex is 3,000.
- Synthetic rubber latices that are less than ppm by weight are provided.
- the synthetic rubber is preferably a synthetic polyisoprene and / or a styrene-isoprene-styrene block copolymer.
- a latex composition containing a latex of the above synthetic rubber and a vulcanizing agent and / or a vulcanization accelerator.
- a film molded body comprising the above-described latex composition.
- an adhesive layer formation base material provided with the adhesive bond layer formed using latex of said synthetic rubber on a base material is provided.
- a method for producing the latex is provided.
- F (V ⁇ N ⁇ P ⁇ S) / Q 2 (1)
- V is the circumferential speed (m / s) of the rotor
- N is the composite frequency (Hz) of the emulsifier
- P is the volume of the emulsification chamber (m 3 )
- S is the rotor and Cross-sectional area of slit provided in stator (m 2 )
- Q is dispersion processing speed (m 3 / s)
- the second dispersion energy F 2 is preferably 2.0 ⁇ 10 7 or more.
- a synthetic rubber latex capable of providing a film molded article such as a dip molded article having excellent mechanical stability and excellent tensile strength and elongation, and manufacturing such a synthetic rubber latex are produced.
- the manufacturing method for doing can be provided.
- FIG. 1 is a diagram showing an example of a manufacturing apparatus used in the manufacturing method of the present invention.
- the synthetic rubber latex of the present invention is a synthetic rubber in which the content of particles having a particle size of 5 ⁇ m or more is less than 3,000 ppm by weight in the particle size distribution determined on the basis of the number of synthetic rubber particles contained in the latex.
- the latex is a synthetic rubber in which the content of particles having a particle size of 5 ⁇ m or more is less than 3,000 ppm by weight in the particle size distribution determined on the basis of the number of synthetic rubber particles contained in the latex.
- Latex in the particle size distribution obtained on the basis of the number of synthetic rubber particles constituting the synthetic rubber latex, the content of particles having a particle size of 5 ⁇ m or more is less than 3,000 ppm by weight, Latex can be excellent in mechanical stability, and when formed into a film molded body such as a dip molded body, the obtained film molded body can be excellent in tensile strength and elongation. Is.
- an additional step such as removal of aggregates is required and the problem that production efficiency is reduced due to the generation of aggregates can be effectively solved.
- the content of particles having a particle size of 5 ⁇ m or more in the particle size distribution determined on the basis of the number of synthetic rubber particles contained in the latex is preferably 2,000 ppm by weight or less.
- the lower limit is usually 500 ppm by weight or more.
- the volume average particle diameter of the synthetic rubber particles constituting the latex of the synthetic rubber of the present invention is preferably 0.6 to 1.7 ⁇ m, more preferably 0.8 to 1.3 ⁇ m, still more preferably 0.9 to 1.0 ⁇ m.
- the volume average particle diameter is in the above range, the mechanical stability as a latex can be further improved, and when the film molded body such as a dip molded body is formed, the obtained film molded body has a tensile strength and It can be made better by elongation.
- the solid content concentration of the latex of the synthetic rubber of the present invention is preferably 30 to 70% by weight, more preferably 40 to 70% by weight. By setting the solid content concentration within the above range, the storage stability when the latex of synthetic rubber is stored can be further improved, which is preferable.
- the synthetic rubber constituting the latex of the synthetic rubber of the present invention is not particularly limited, but is a homopolymer or copolymer of a conjugated diene monomer such as synthetic polybutadiene, synthetic polyisoprene, synthetic polychloroprene; styrene-butadiene copolymer Polymer, styrene-isoprene copolymer, styrene-isoprene-styrene block copolymer, acrylonitrile-butadiene copolymer, acrylonitrile-isoprene copolymer, acrylonitrile-butadiene-isoprene copolymer, butyl acrylate-butadiene copolymer Examples thereof include copolymers of conjugated diene monomers such as those with other monomers copolymerizable therewith; acrylate (co) polymers and the like.
- a conjugated diene monomer such as synthetic poly
- synthetic polyisoprene and / or styrene-isoprene-styrene block copolymers are preferred because they are excellent in tensile strength and elongation when formed into a film molded body such as a dip molded body.
- the latex of the synthetic rubber of the present invention is a synthetic polyisoprene and / or a styrene-isoprene-styrene block copolymer
- the present invention is not limited to these synthetic polyisoprene and / or latex of styrene-isoprene-styrene block copolymer.
- the synthetic polyisoprene latex of the present invention is a latex of synthetic polyisoprene obtained by polymerizing isoprene.
- the synthetic polyisoprene contained in the synthetic polyisoprene latex of the present invention may be a homopolymer of isoprene or a copolymer of other ethylenically unsaturated monomers copolymerizable with isoprene. There may be.
- the content of the isoprene unit in the synthetic polyisoprene is flexible, and it is easy to obtain a dip-molded article excellent in tensile strength. % Or more, more preferably 95% by weight or more, and particularly preferably 100% by weight (isoprene homopolymer).
- Examples of other ethylenically unsaturated monomers copolymerizable with isoprene include conjugated diene monomers other than isoprene such as butadiene, chloroprene and 1,3-pentadiene; acrylonitrile, methacrylonitrile, fumaronitrile, ⁇ - Ethylenically unsaturated nitrile monomers such as chloroacrylonitrile; vinyl aromatic monomers such as styrene and alkylstyrene; methyl (meth) acrylate (meaning “methyl acrylate and / or methyl methacrylate”; The same applies to ethyl (meth) acrylate, etc.), ethylenically unsaturated carboxylic acid ester monomers such as ethyl (meth) acrylate, butyl (meth) acrylate, and 2-ethylhexyl (meth) acrylate; Is mentioned.
- Synthetic polyisoprene is produced in an inert polymerization solvent using a conventionally known method, for example, a Ziegler polymerization catalyst composed of trialkylaluminum-titanium tetrachloride or an alkyllithium polymerization catalyst such as n-butyllithium or sec-butyllithium.
- the polymer solution of synthetic polyisoprene can be obtained by solution polymerization of isoprene and other copolymerizable ethylenically unsaturated monomers used as necessary.
- a trialkylaluminum tetrachloride is used as a polymerization catalyst because it has a high cis content and can have good tensile strength and flexibility when formed into a film molded body such as a dip molded body.
- a synthetic polyisoprene obtained using a Ziegler polymerization catalyst made of titanium is preferred.
- the cis content in the resulting synthetic polyisoprene is usually as low as less than 90% by weight. It is preferable to use a Ziegler polymerization catalyst.
- the cis content in the synthetic polyisoprene is preferably 90% by weight or more, more preferably 95% by weight or more, and still more preferably 98% by weight or more.
- the tensile strength and flexibility in the case of a film molded body such as a dip molded body can be further increased.
- polymerization solvent examples include aromatic hydrocarbon solvents such as benzene, toluene and xylene; alicyclic hydrocarbon solvents such as cyclopentane, cyclopentene, cyclohexane and cyclohexene; aliphatics such as butane, pentane, hexane and heptane. Hydrocarbon solvents; halogenated hydrocarbon solvents such as methylene chloride, chloroform, ethylene dichloride; and the like. Of these, aliphatic hydrocarbon solvents are preferred and butane is particularly preferred.
- isoprene units in the synthetic polyisoprene which are cis bond units, trans bond units, 1,2-vinyl bond units, and 3,4-vinyl bond units, depending on the bond state of isoprene.
- the content of cis-bond units in the isoprene units contained in the synthetic polyisoprene is preferably 70% by weight or more, more preferably 90% by weight based on the total isoprene units. % Or more, more preferably 95% by weight or more.
- the weight average molecular weight of the synthetic polyisoprene is preferably 10,000 to 5,000,000, more preferably 500,000 to 5,000,000, and even more preferably, in terms of standard polystyrene by gel permeation chromatography analysis. Is 800,000 to 3,000,000.
- the polymer Mooney viscosity (ML1 + 4, 100 ° C.) of the synthetic polyisoprene is preferably 50 to 80, more preferably 60 to 80, and still more preferably 70 to 80.
- FIG. 1 is a diagram showing an example of a manufacturing apparatus used in the manufacturing method of the present invention.
- the manufacturing apparatus shown in FIG. 1 includes a mixer 10, a rotor / stator emulsifier 20, a storage tank 30, a reflux pipe 40, and a distillation tank 50.
- a polymer solution of synthetic polyisoprene and a surfactant aqueous solution or surfactant dispersion obtained by dissolving or dispersing a surfactant in water are each supplied with a general pump.
- the mixture is transferred to the mixer 10 and mixed with the mixer 10 to obtain a mixture, and then the obtained mixture is sent to the rotor-stator emulsifier 20, and the rotor-stator emulsifier 20 performs the first dispersion treatment.
- a coarsely dispersed emulsion is obtained.
- the obtained coarsely dispersed emulsion is recovered in the storage tank 30.
- the polymer solution of synthetic polyisoprene the polymer solution of synthetic polyisoprene obtained by solution polymerization may be used as it is, or after taking out solid synthetic polyisoprene from the polymer solution after solution polymerization. Alternatively, those dissolved in an organic solvent may be used.
- the organic solvent similar to the organic solvent described above is used for the polymerization of the synthetic polyisoprene. In this case, an alicyclic hydrocarbon solvent is preferable, and cyclohexane is particularly preferable.
- the content ratio of the organic solvent in the polymer solution of synthetic polyisoprene is preferably 2,000 parts by weight or less, more preferably 20 to 1,500 parts by weight, and still more preferably 100 parts by weight of synthetic polyisoprene. 500 to 1300 parts by weight, most preferably 700 to 900 parts by weight.
- an anionic surfactant can be preferably used as the surfactant to be contained in the surfactant aqueous solution.
- Anionic surfactants include fatty acid salts such as sodium laurate, potassium myristate, sodium palmitate, potassium oleate, sodium linolenate, sodium rosinate; sodium dodecylbenzenesulfonate, potassium dodecylbenzenesulfonate, decylbenzene Alkylbenzene sulfonates such as sodium sulfonate, potassium decylbenzenesulfonate, sodium cetylbenzenesulfonate, potassium cetylbenzenesulfonate; sodium di (2-ethylhexyl) sulfosuccinate, potassium di (2-ethylhexyl) sulfosuccinate, dioctylsulfosuccinate Alkylsulfosuccinates such as sodium sul
- fatty acid salts, alkylbenzene sulfonates, alkyl sulfosuccinates, alkyl sulfate esters and polyoxyethylene alkyl ether sulfate salts are preferable, and fatty acid salts and alkylbenzene sulfonates are particularly preferable.
- the content of the surfactant in the aqueous surfactant solution or the surfactant dispersion is preferably 0.2 to 15.0% by weight, more preferably 0.5 to 5.0% by weight, and still more preferably 1. 0 to 2.0% by weight.
- the amount of the surfactant aqueous solution or surfactant dispersion used for the polymer solution of synthetic polyisoprene is the same as the amount of surfactant contained in the surfactant aqueous solution or surfactant dispersion.
- the amount is preferably 0.1 to 50 parts by weight, more preferably 0.5 to 30 parts by weight, and still more preferably 1 to 20 parts by weight with respect to 100 parts by weight.
- the mixer 10 is not particularly limited as long as it can mix a polymer solution of synthetic polyisoprene with an aqueous surfactant solution or a surfactant dispersion, and for example, a multi-line mixer.
- a static mixer, a spiral pin mixer or the like can be used.
- the rotor / stator type emulsifier 20 is an apparatus that can apply a shearing force to the mixture by rotating a rotor having a plurality of slits relative to a stator having a plurality of slits.
- a rotor-stator type emulsifier 20 for example, a trade name “TK Pipeline Homomixer” (manufactured by Special Machine Industries Co., Ltd.), a trade name “Colloid Mill” (manufactured by Shinko Pantech Co., Ltd.), a trade name “ "Slasher” (manufactured by Nihon Coke Kogyo Co., Ltd.), trade name “Trigonal wet pulverizer” (manufactured by Mitsui Miike Chemical Co., Ltd.), trade name "Cabitron” (manufactured by Eurotech), trade name "Milder” (manufactured by Taiheiyo Kiko ), And continuous emulsifiers such as trade name “Fine Flow Mill” (manufactured by Taiheiyo Kiko Co., Ltd.).
- the first dispersion energy in the first dispersion process when the dispersion energy F given to the mixture is the first dispersion energy F 1 with respect to the dispersion energy F obtained by the following formula (1). It is desirable to perform dispersion so that F 1 is 8.0 ⁇ 10 7 or more.
- F (V ⁇ N ⁇ P ⁇ S) / Q 2 (1)
- V is the circumferential speed (m / s) of the rotor, and is determined from the rotational speed of the rotor constituting the rotor-stator pair and the outer diameter of the rotor.
- N is a composite frequency (Hz) of the emulsifier, and depends on the number of rotor-stator pair combinations and the number of slits provided in each rotor-stator. For example, when the outer diameter is 30 mm, the peripheral speed is 19 m / s, the number of rotor / stator pairs is one, the number of slits in the rotor is 8, and the number of slits in the stator is 12, the combined frequency is 19 000 Hz.
- P is the volume (m 3 ) of the emulsification chamber.
- the volume is the volume of the portion where the object to be dispersed can stay in the space in which the rotor / stator pair is arranged, and the rotor and stator in the emulsification chamber It is a volume that includes etc.
- S is the cross-sectional area of the slit provided in the rotor and stator (m 2), specifically, the sum of the cross-sectional area per slit.
- Q is the dispersion processing speed (m 3 / s), and is determined by the flow rate of the material to be dispersed.
- the first dispersion process is performed so that the first dispersion energy F 1 is 8.0 ⁇ 10 7 or more, and the total dispersion energy F total described later is 1.0 ⁇ 10 8 or more.
- the content of particles having a particle size distribution of 5 ⁇ m or more in the particle size distribution obtained on the basis of the number of rubber particles contained in the resulting synthetic polyisoprene latex is 3,000 ppm by weight. It can be made less than.
- the first dispersion energy F 1 is less than 8.0 ⁇ 10 7
- the content of particles having a particle size of 5 ⁇ m or more in the particle size distribution is 3,000 ppm by weight or more, and mechanical stability as latex is obtained. It becomes inferior.
- the first dispersion energy F 1 is 8.0 ⁇ 10 7 or more, preferably 8.5 ⁇ 10 7 or more, more preferably 1.0 ⁇ 10 8 or more.
- the first upper limit of the dispersion energy F 1 is not particularly limited, but is usually, 1.5 ⁇ 10 8 or less.
- the obtained coarsely dispersed emulsion is recovered in the storage tank 30.
- the coarsely dispersed emulsion recovered in the storage tank 30 is returned to the mixer 10 through the reflux pipe 40, stirred in the mixer 10, and then sent to the rotor / stator type emulsifier 20 again.
- the second dispersion treatment is performed on the coarsely dispersed emulsion in the rotor / stator type emulsifier 20 to obtain a finely dispersed emulsion, and the obtained finely dispersed emulsion is collected in the distillation tank 50.
- the liquid to be treated in the second dispersion treatment is transferred by the stirring force of the rotor / stator type emulsifier 20.
- dispersion energy F obtained by the above formula (1) a dispersed energy F imparted to the crude dispersion emulsion and second distributed energy F 2, a first dispersion energy F 1 described above second
- the total of the dispersion energy F 2 is the total dispersion energy F total
- the first dispersion processing is performed so that the first dispersion energy F 1 is 8.0 ⁇ 10 7 or more, and the total dispersion energy F total is 1.0 ⁇ 10 8 or more.
- the content of particles having a particle size distribution of 5 ⁇ m or more in the particle size distribution obtained on the basis of the number of rubber particles contained in the resultant synthetic polyisoprene latex is 3,000 weights. It can be less than ppm.
- the total dispersion energy F total is less than 1.0 ⁇ 10 8
- the content of particles having a particle size of 5 ⁇ m or more in the particle size distribution is 3,000 ppm by weight or more, and mechanical stability as a latex is obtained. It will be inferior to.
- the first dispersion energy F 1 is 1.0 ⁇ 10 8 or more and If the second dispersion process is not performed, the total dispersion energy F total is 1.0 ⁇ 10 8 or more without performing the second dispersion process.
- the content of particles having a particle size of 5 ⁇ m or more in the size distribution does not become less than 3,000 ppm by weight, or the production efficiency may be significantly reduced. Therefore, in the present invention, it is desirable to perform the second dispersion process after the first dispersion process, and the second dispersion energy F 2 in the second dispersion process is preferably 2.0 ⁇ 10 7 or more.
- the second dispersion treatment is preferably performed under the condition of preferably 2.5 ⁇ 10 7 or more, more preferably 5.0 ⁇ 10 7 or more.
- the upper limit of the second dispersion energy F 2 is not particularly limited, but is usually 1.5 ⁇ 10 8 or less.
- the total dispersion energy F total is 1.0 ⁇ 10 8 or more, preferably 1.3 ⁇ 10 8 or more, more preferably 1.5 ⁇ 10 8 or more. Further, the upper limit of the total dispersion energy F total is not particularly limited, but is usually 3.0 ⁇ 10 8 or less.
- the second dispersion process a total dispersion energy F total but may be performed under a condition such that 1.0 ⁇ 10 8 or more, the total dispersion energy F total is 1.0 ⁇ 10 8 in the distributed processing of one degree If not above, or if it is desired to further increase the total dispersion energy F total , it may be performed a plurality of times. That is, the coarsely dispersed emulsion stored in the storage tank 30 is returned to the mixer 10 through the reflux pipe 40, and then dispersed in the rotor-stator type emulsifier 20, and then returned to the storage tank 30 and again.
- the mixture is returned to the mixer 10 through the reflux pipe 40, and then dispersed in the rotor-stator type emulsifier 20, and then the obtained finely dispersed emulsion is recovered in the distillation tank 50 to be dispersed twice.
- distribution process Furthermore, you may perform the dispersion
- the distributed processing may be performed continuously only for the time required for performing the distributed processing twice. Further, for example, in the case of performing distributed processing of 3 degrees, 4 degrees, or more, the distributed processing is continuously performed for the time required to perform distributed processing of 3 degrees, 4 degrees, or more. It is good also as an aspect which performs.
- recovered after the 2nd dispersion process is desirable to perform the process which removes an organic solvent in the distillation tank 50 about the micro-dispersion emulsion collect
- a method for removing the organic solvent from the finely dispersed emulsion there can be mentioned a method in which the content of the organic solvent (preferably an alicyclic hydrocarbon solvent) in the resulting synthetic polyisoprene latex can be 500 ppm by weight or less.
- methods such as vacuum distillation, atmospheric distillation, and steam distillation can be employed.
- the polydisperse emulsion thus obtained can be subjected to adjustment of solid content concentration such as concentration operation or pH adjustment, if necessary, to obtain a synthetic polyisoprene latex.
- concentration operation include vacuum distillation, atmospheric distillation, centrifugation, membrane concentration, and the like. Among these, the residual amount of the surfactant in the synthetic polyisoprene latex can be reduced. Centrifugation is preferable from the viewpoint that it can be performed.
- a carboxyl group-containing synthetic polyisoprene may be obtained by introducing a carboxyl group into the synthetic polyisoprene contained in the synthetic polyisoprene latex, if necessary.
- the method for introducing a carboxyl group into the synthetic polyisoprene is not particularly limited, and examples thereof include a method of graft polymerization of a monomer having a carboxyl group on the synthetic polyisoprene in a latex.
- the graft polymerization method a conventionally known method can be used. For example, a method described in International Publication No. 2014/129547 can be used.
- Styrene-isoprene-styrene block copolymer latex The styrene-isoprene-styrene block copolymer latex of the present invention is a latex of a block copolymer of styrene and isoprene.
- the content ratio of the styrene unit to the isoprene unit in the styrene-isoprene-styrene block copolymer is usually 1:99 to 90:10, preferably 3:97 to 70: by weight ratio of “styrene unit: isoprene unit”.
- the range is 30, more preferably 5:95 to 50:50, and still more preferably 10:90 to 30:70.
- the styrene-isoprene-styrene block copolymer is obtained by a conventionally known method, for example, using a Ziegler polymerization catalyst composed of trialkylaluminum-titanium tetrachloride or an alkyllithium polymerization catalyst such as n-butyllithium or sec-butyllithium.
- a Ziegler polymerization catalyst composed of trialkylaluminum-titanium tetrachloride or an alkyllithium polymerization catalyst such as n-butyllithium or sec-butyllithium.
- a trialkylaluminum tetrachloride is used as a polymerization catalyst because it has a high cis content and can have good tensile strength and flexibility when formed into a film molded body such as a dip molded body.
- a styrene-isoprene-styrene block copolymer obtained using a Ziegler polymerization catalyst made of titanium is preferred.
- the cis content in the styrene-isoprene-styrene block copolymer is preferably 90% by weight or more, more preferably 95% by weight or more, and further preferably 98% by weight or more.
- the tensile strength and flexibility in the case of a film molded body such as a dip molded body can be further increased.
- a polymerization solvent the same thing as the synthetic polyisoprene latex mentioned above can be used.
- the weight average molecular weight of the styrene-isoprene-styrene block copolymer is preferably 10,000 to 1,000,000, more preferably 50,000 to 5, in terms of standard polystyrene by gel permeation chromatography analysis. It is 00,000, more preferably 100,000 to 3,000,000.
- the weight average molecular weight of the styrene-isoprene-styrene block copolymer within the above range, the tensile strength of the obtained film molded body in the case of forming a film molded body such as a dip molded body is improved and the styrene-isoprene is improved.
- -Styrene block copolymer latex tends to be easy to produce.
- the polymer Mooney viscosity (ML1 + 4, 100 ° C.) of the styrene-isoprene-styrene block copolymer is preferably 50 to 80, more preferably 60 to 80, and still more preferably 70 to 80.
- the styrene-isoprene of the present invention is obtained from the polymer solution of the styrene-isoprene-styrene block copolymer using the production apparatus shown in FIG. 1 in the same manner as in the case of obtaining the synthetic polyisoprene latex.
- -A styrene block copolymer latex can be obtained.
- the styrene-isoprene-styrene block copolymer latex of the present invention is obtained from the polymer solution of the styrene-isoprene-styrene block copolymer, the styrene-isoprene-styrene block copolymer is similarly prepared.
- the resulting mixture is sent to the rotor / stator emulsifier 20 by the stirring force of the mixer 10,
- the rotor-stator emulsifier 20 performs the first dispersion treatment with the first dispersion energy F 1 to obtain a coarsely dispersed emulsion, and the obtained coarsely dispersed emulsion is recovered in the storage tank 30.
- the obtained coarsely dispersed emulsion is similarly returned to the mixer 10 through the reflux pipe 40 and stirred in the mixer 10.
- the rotor / stator emulsifier 20 is again fed by the stirring force of the mixer 10. send.
- the crude dispersion emulsion in the second dispersion energy F 2 by performing a second dispersion treatment, to obtain a fine dispersion emulsion, resulting finely dispersed emulsion Is recovered in the distillation tank 50.
- the styrene-isoprene-styrene block copolymer is further adjusted as necessary by adjusting the solid content concentration such as concentration operation or pH adjustment. Latex can be obtained.
- the first dispersion energy F 1 is 8.0 ⁇ 10 7 or more, preferably 8.5 ⁇ 10 7 or more, more preferably 1.0 ⁇ 10 8 or more.
- the first upper limit of the dispersion energy F 1 is not particularly limited, it is usually, 1.5 ⁇ 10 8 or less.
- the total dispersion energy F total is 1.0 ⁇ 10 8 or more, preferably 1.3 ⁇ 10 8 or more, more preferably 1.5 ⁇ 10 8 or more.
- the upper limit of the total dispersion energy F total is not particularly limited, but is usually 3.0 ⁇ 10 8 or less.
- the second dispersion energy F 2 in the second dispersion treatment is preferably 2.0 ⁇ 10 7 or more, more preferably 2.5 ⁇ 10 7 or more, and further preferably 5.0 ⁇ 10 7 or more.
- the upper limit of the second dispersion energy F 2 is not particularly limited, but is usually 1.5 ⁇ 10 8 or less.
- the carboxyl group-containing styrene-isoprene is introduced into the styrene-isoprene-styrene block copolymer contained in the styrene-isoprene-styrene block copolymer latex, if necessary, by introducing a carboxyl group.
- -It may be a styrene block copolymer.
- the method for introducing a carboxyl group into the styrene-isoprene-styrene block copolymer is not particularly limited. For example, a monomer having a carboxyl group is grafted to the styrene-isoprene-styrene block copolymer in a latex. The method of superposing
- polymerizing is mentioned.
- Latex Composition The latex composition of the present invention is obtained by blending the above-described synthetic rubber latex of the present invention with a vulcanizing agent and / or a vulcanization accelerator.
- vulcanizing agents include powdered sulfur, sulfur white, precipitated sulfur, colloidal sulfur, surface-treated sulfur, insoluble sulfur, and the like; sulfur chloride, sulfur dichloride, morpholine disulfide, alkylphenol disulfide, caprolactam disulfide (N, And sulfur-containing compounds such as N′-dithio-bis (hexahydro-2H-azepinone-2)), phosphorus-containing polysulfides, polymer polysulfides, and 2- (4′-morpholinodithio) benzothiazole.
- sulfur can be preferably used.
- Vulcanizing agents can be used alone or in combination of two or more.
- the content of the vulcanizing agent is not particularly limited, but is preferably 0.1 to 10 parts by weight, and more preferably 0.2 to 3 parts by weight with respect to 100 parts by weight of the synthetic rubber contained in the latex.
- vulcanization accelerator those usually used in a method for obtaining a film molded product such as dip molding can be used.
- the content of the vulcanization accelerator is preferably 0.05 to 5 parts by weight, more preferably 0.1 to 2 parts by weight with respect to 100 parts by weight of the synthetic rubber contained in the latex.
- the latex composition of this invention contains a zinc oxide further.
- the content of zinc oxide is not particularly limited, but is preferably 0.1 to 5 parts by weight, more preferably 0.2 to 2 parts by weight with respect to 100 parts by weight of the synthetic rubber contained in the latex.
- the latex composition of the present invention further comprises a compounding agent such as an anti-aging agent; a dispersant; a reinforcing agent such as carbon black, silica, or talc; a filler such as calcium carbonate or clay; an ultraviolet absorber; a plasticizer; It can mix
- a compounding agent such as an anti-aging agent; a dispersant; a reinforcing agent such as carbon black, silica, or talc; a filler such as calcium carbonate or clay; an ultraviolet absorber; a plasticizer; It can mix
- Antiaging agents include 2,6-di-4-methylphenol, 2,6-di-t-butylphenol, butylhydroxyanisole, 2,6-di-t-butyl- ⁇ -dimethylamino-p-cresol, Octadecyl-3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate, styrenated phenol, 2,2′-methylene-bis (6- ⁇ -methyl-benzyl-p-cresol), 4, Butylation of 4'-methylenebis (2,6-di-t-butylphenol), 2,2'-methylene-bis (4-methyl-6-t-butylphenol), alkylated bisphenol, p-cresol and dicyclopentadiene Phenol-based antioxidants containing no sulfur atom, such as reaction products; 2,2′-thiobis- (4-methyl-6-tert-butylphenol 4,4′-thiobis- (6-tert-butyl-o-cresol), 2,6-d
- the content of the anti-aging agent is preferably 0.05 to 10 parts by weight, more preferably 0.1 to 5 parts by weight with respect to 100 parts by weight of the synthetic rubber contained in the latex.
- the method for preparing the latex composition of the present invention is not particularly limited.
- a dispersing machine such as a ball mill, a kneader, or a disper
- a latex of synthetic rubber is added to a vulcanizing agent and / or a vulcanization accelerator, and
- the aqueous dispersion is mixed with the synthetic rubber.
- the method of mixing with latex is mentioned.
- the latex composition of the present invention preferably has a pH of 7 or more, more preferably in the range of 7 to 13, and still more preferably in the range of 8 to 12.
- the solid content concentration of the latex composition is preferably in the range of 15 to 65% by weight.
- the latex composition of the present invention is preferably aged (pre-crosslinked) before being subjected to molding such as dip molding from the viewpoint of further improving the mechanical properties of a film molded body such as a dip molding obtained.
- the pre-crosslinking time is not particularly limited and depends on the pre-crosslinking temperature, but is preferably 1 to 14 days, and more preferably 1 to 7 days.
- the pre-crosslinking temperature is preferably 20 to 40 ° C. After pre-crosslinking, it is preferably stored at a temperature of 10 to 30 ° C. until it is subjected to molding such as dip molding. When stored at a high temperature, the tensile strength of the obtained film molded body such as a dip molded body may be lowered.
- the film molded body of the present invention is a film-shaped molded body made of the latex composition of the present invention.
- the film thickness of the film molded body of the present invention is preferably 0.03 to 0.50 mm, more preferably 0.05 to 0.40 mm, and particularly preferably 0.08 to 0.30 mm.
- the film molded body of the present invention is not particularly limited, but is preferably a dip molded body obtained by dip molding the latex composition of the present invention.
- Dip molding is a method in which a mold is immersed in a latex composition, the composition is deposited on the surface of the mold, the mold is then lifted from the composition, and then the composition deposited on the mold surface is dried. is there.
- the mold before being immersed in the latex composition may be preheated. Further, a coagulant can be used as necessary before the mold is immersed in the latex composition or after the mold is pulled up from the latex composition.
- the method of using the coagulant include a method in which the mold before dipping in the latex composition is immersed in a solution of the coagulant to attach the coagulant to the mold (anode coagulation dipping method), and the latex composition is deposited.
- anode coagulation dipping method There is a method of immersing the formed mold in a coagulant solution (Teag adhesion dipping method), etc., but the anode adhesion dipping method is preferable in that a dip-formed product with little thickness unevenness can be obtained.
- coagulants include metal halides such as barium chloride, calcium chloride, magnesium chloride, zinc chloride, and aluminum chloride; nitrates such as barium nitrate, calcium nitrate, and zinc nitrate; acetic acid such as barium acetate, calcium acetate, and zinc acetate. Salts; water-soluble polyvalent metal salts such as calcium sulfate, magnesium sulfate, and sulfates such as aluminum sulfate; Of these, calcium salts are preferable, and calcium nitrate is more preferable. These water-soluble polyvalent metal salts can be used alone or in combination of two or more.
- the coagulant is preferably used in the form of an aqueous solution.
- This aqueous solution may further contain a water-soluble organic solvent such as methanol or ethanol, or a nonionic surfactant.
- concentration of the coagulant varies depending on the type of the water-soluble polyvalent metal salt, but is preferably 5 to 50% by weight, more preferably 10 to 30% by weight.
- the deposit formed on the mold is usually dried by heating. What is necessary is just to select drying conditions suitably.
- the heating conditions at the time of crosslinking are not particularly limited, but are preferably 60 to 150 ° C., more preferably 100 to 130 ° C., and preferably 10 to 120 minutes.
- the heating method is not particularly limited, and there are a method of heating with warm air in an oven, a method of heating by irradiating infrared rays, and the like.
- the mold may be washed with water or warm water to remove water-soluble impurities (for example, excess surfactant or coagulant) before or after heating the mold on which the latex composition is deposited.
- water-soluble impurities for example, excess surfactant or coagulant
- the hot water used is preferably 40 ° C. to 80 ° C., more preferably 50 ° C. to 70 ° C.
- the dip-formed body after crosslinking is detached from the mold.
- the desorption method include a method of peeling from a mold by hand, a method of peeling by water pressure or compressed air pressure, and the like. If the dip-formed product in the middle of crosslinking has sufficient strength against desorption, it may be desorbed in the middle of crosslinking, and then the subsequent crosslinking may be continued.
- the film molded body of the present invention and the dip molded body which is one embodiment thereof are obtained using the latex of the present invention described above, they have excellent tensile strength and elongation, and are particularly suitable as, for example, gloves. Can be used.
- the film molded body is a glove
- organic fine particles such as inorganic fine particles such as talc and calcium carbonate or starch particles are gloved. It may be dispersed on the surface, an elastomer layer containing fine particles may be formed on the surface of the glove, or the surface layer of the glove may be chlorinated.
- the membrane molded article of the present invention and the dip molded article as one aspect thereof are medical supplies such as nipples for baby bottles, syringes, tubes, water pillows, balloon sacks, catheters, condoms, etc. It can also be used for toys such as dolls and balls; industrial articles such as pressure forming bags and gas storage bags; finger sack and the like.
- the adhesive layer forming base material of the present invention comprises a base material comprising an adhesive layer formed on the base material using the above-described synthetic rubber latex of the present invention, and an adhesive layer. And composite material.
- the substrate is not particularly limited, but for example, a fiber substrate can be used.
- the kind of fiber which comprises a fiber base material is not specifically limited, For example, polyamide fibers, such as vinylon fiber, polyester fiber, nylon, and aramid (aromatic polyamide), glass fiber, cotton, rayon etc. are mentioned. These can be appropriately selected according to the application.
- the shape of the fiber substrate is not particularly limited, and examples thereof include staples, filaments, cords, ropes, woven fabrics (such as canvas), and the like, and can be appropriately selected depending on the application.
- the adhesive layer may be formed using the above-described synthetic rubber latex of the present invention, and may be used as it is without blending a compounding agent or the like in the above-described synthetic rubber latex of the present invention. Or it is set as an adhesive composition by mix
- Examples of the compounding agent contained in the adhesive composition include an adhesive resin.
- the adhesive resin is not particularly limited, and for example, resorcin-formaldehyde resin, melamine resin, epoxy resin and isocyanate resin can be suitably used, and among these, resorcin-formaldehyde resin is preferable.
- As the resorcin-formaldehyde resin known ones (for example, those disclosed in JP-A-55-142635) can be used.
- the reaction ratio of resorcin to formaldehyde is usually 1: 1 to 1: 5, preferably 1: 1 to 1: 3 in terms of a molar ratio of “resorcin: formaldehyde”.
- the adhesive composition contains 2,6-bis (2,4-dihydroxyphenylmethyl) -4-chlorophenol or a similar compound, isocyanate, block, which has been conventionally used to further increase the adhesive strength.
- isocyanate, ethylene urea, polyepoxide, modified polyvinyl chloride resin and the like can be contained.
- the adhesive composition can contain a vulcanization aid.
- a vulcanization aid By including a vulcanization aid, the mechanical strength of the adhesive layer-forming substrate can be improved.
- Vulcanization aids include quinone dioximes such as p-quinone dioxime; methacrylic acid esters such as lauryl methacrylate and methyl methacrylate; DAF (diallyl fumarate), DAP (diallyl phthalate), TAC (triallyl cyanurate), And allyl compounds such as TAIC (triallyl isocyanurate); maleimide compounds such as bismaleimide, phenylmaleimide and N, Nm-phenylene dimaleimide; sulfur; and the like.
- the content (solid content) of the synthetic rubber in the adhesive composition is preferably 5 to 60% by weight, more preferably 10 to 30% by weight.
- the adhesive layer-forming substrate of the present invention is, for example, a method of applying the synthetic rubber latex of the present invention or an adhesive composition containing the same to the surface of the substrate, or the substrate of the synthetic layer of the present invention. It can be obtained by forming an adhesive layer on a substrate by a method of immersing in rubber latex or an adhesive composition containing the rubber latex.
- Such an adhesive layer-forming substrate of the present invention can be used as a substrate-rubber composite by adhering to rubber via an adhesive layer, for example.
- the base material-rubber composite is not particularly limited.
- rubber using a base fiber-like fiber base material such as a rubber toothed belt with a core wire using a cord-like fiber base material or a canvas Examples thereof include a toothed belt.
- the method for obtaining the substrate-rubber composite is not particularly limited.
- the latex of the synthetic rubber of the present invention or the adhesive composition containing the same is adhered to the substrate by a coating method, a dipping treatment, or the like.
- a method of obtaining an adhesive layer-forming substrate, placing the adhesive layer-forming substrate on rubber, and heating and pressurizing it is exemplified.
- the pressurization can be performed using a compression (press) molding machine, a metal roll, an injection molding machine or the like.
- the pressurizing pressure is preferably 0.5 to 20 MPa, more preferably 2 to 10 MPa.
- the heating temperature is preferably 130 to 300 ° C, more preferably 150 to 250 ° C.
- the treatment time for heating and pressing is preferably 1 to 180 minutes, more preferably 5 to 120 minutes.
- rubber molding and adhesion between the adhesive layer forming substrate and the rubber can be performed simultaneously.
- a base material-rubber-base composite can be exemplified.
- the base material-rubber-base material composite can be formed, for example, by combining a base material (may be a composite of two or more kinds of base materials) and a base material-rubber composite. Specifically, a core wire as a base material, rubber and a base fabric as a base material are stacked (in this case, the core wire and the base fabric are coated with latex of the synthetic rubber of the present invention or an adhesive composition containing the same).
- a base material-rubber-base material composite can be obtained by applying it while heating and applying pressure while heating.
- the base material-rubber composite obtained using the adhesive layer forming base material of the present invention is excellent in mechanical strength, abrasion resistance and water resistance. Therefore, a flat belt, V belt, V ribbed belt, It can be suitably used as a belt such as a round belt, a square belt, or a toothed belt.
- the base material-rubber composite obtained using the base material for forming an adhesive layer of the present invention is excellent in oil resistance and can be suitably used as a belt in oil.
- the substrate-rubber composite obtained using the adhesive layer-forming substrate of the present invention can be suitably used for hoses, tubes, diaphragms and the like.
- Examples of the hose include a single tube rubber hose, a multilayer rubber hose, a braided reinforcement hose, and a cloth wound reinforcement hose.
- Examples of the diaphragm include a flat diaphragm and a rolling diaphragm.
- the substrate-rubber composite obtained by using the adhesive layer-forming substrate of the present invention can be used as industrial products such as seals and rubber rolls in addition to the above uses.
- the seal include a moving part seal such as a rotating part, a swinging part, and a reciprocating part, and a fixed part seal.
- the motion part seal include an oil seal, a piston seal, a mechanical seal, a boot, a dust cover, a diaphragm, and an accumulator.
- Examples of the fixed part seal include an O-ring and various gaskets.
- rolls that are parts of OA equipment such as printing equipment and copying equipment; rolls for fiber processing such as spinning rolls for spinning and drafting rolls for spinning; rolls for iron making such as bridle rolls, snubber rolls, steering rolls, etc.
- OA equipment printing equipment and copying equipment
- rolls for fiber processing such as spinning rolls for spinning and drafting rolls for spinning
- rolls for iron making such as bridle rolls, snubber rolls, steering rolls, etc.
- the Content rate of particles of 5 ⁇ m or more in the number-based particle size distribution in latex It measured using the electrical-resistance type
- formula particle size distribution measuring apparatus Brand name "Coulter Counter Multisizer 3", the Beckman Coulter company make).
- Aggregate content ⁇ ( ⁇ ) / ( ⁇ ⁇ ⁇ ) ⁇ ⁇ 10,000
- ⁇ represents the weight of the wire mesh and dried aggregate after drying
- ⁇ represents the weight of the wire mesh
- ⁇ represents the weight of the latex composition
- ⁇ represents the solid content concentration of the latex composition.
- the tensile strength and elongation of the dip molded body were measured based on ASTM D412. Specifically, the dip-molded body is punched with a dumbbell (Die-C) to produce a test piece for measurement, and the obtained test piece is pulled with a Tensilon universal testing machine ("RTC-1225A" manufactured by Orientec). The sample was pulled at 500 mm / min, and the tensile strength just before the break (unit: MPa) and the elongation just before the break (unit:%) were measured.
- RTC-1225A Tensilon universal testing machine
- Example 1 (Production of synthetic polyisoprene latex (f-1)) Synthetic polyisoprene having a weight average molecular weight of 1,300,000 (trade name “NIPOL IR2200L”, manufactured by Nippon Zeon Co., Ltd., isoprene homopolymer obtained using a Ziegler polymerization catalyst, cis bond unit amount: 98% by weight) was mixed with cyclohexane and dissolved by raising the temperature to 60 ° C. with stirring to prepare a cyclohexane solution (a) of synthetic polyisoprene.
- Synthetic polyisoprene having a weight average molecular weight of 1,300,000 trade name “NIPOL IR2200L”, manufactured by Nippon Zeon Co., Ltd., isoprene homopolymer obtained using a Ziegler polymerization catalyst, cis bond unit amount: 98% by weight
- a finely dispersed emulsion was obtained using the cyclohexane solution (a) and the anionic surfactant aqueous solution (b) using the production apparatus shown in FIG.
- the product name “Multiline Mixer MS26-MMR-5.5L” (manufactured by Satake Chemical Machinery Co., Ltd.) is used as the mixer 10
- the product name “Milder MDN310” is used as the rotor-stator type emulsifier 20. (Manufactured by Taiheiyo Kiko Co., Ltd.) was used.
- the rotor-stator type emulsifier 20 After mixing using the mixer 10, the rotor-stator type emulsifier 20 performs the first dispersion treatment, and the obtained coarsely dispersed emulsion (c-1) is stored in the storage tank. It was collected at 30.
- the coarsely dispersed emulsion (c-1) is returned again to the mixer 10 through the reflux pipe 40, and after stirring in the mixer 10, it is sent again to the rotor-stator type emulsifier 20, and the rotor-stator type
- the emulsifier 20 performs the second dispersion treatment, and the finely dispersed emulsion (d-1) obtained is recovered in the distillation tank 50.
- the finely dispersed emulsion (d-1) is heated to 80 ° C. under a reduced pressure of ⁇ 0.01 to ⁇ 0.09 MPa (gauge pressure) to distill off the cyclohexane.
- a solvent-dispersed finely dispersed emulsion (e-1) was obtained.
- the obtained solvent-dispersed finely dispersed emulsion (e-1) is taken out from the distillation tank 50 and 4,000 to 9 using a continuous centrifuge (trade name “SRG610”, manufactured by Alfa Laval). Centrifugation was performed at 1,000 G to obtain a synthetic polyisoprene latex (f-1) having a solid content concentration of 61.0% by weight as a light liquid. Then, mechanical stability was measured using the obtained synthetic polyisoprene latex (f-1). The results are shown in Table 1.
- the hand mold coated with the coagulant was taken out of the oven and immersed in the latex composition for 10 seconds.
- the hand mold was immersed in 60 ° C. warm water for 5 minutes.
- the mixture was cooled to room temperature, sprayed with talc, and then peeled off from the hand mold to obtain a dip-formed body.
- the tensile strength and elongation of the obtained dip-molded product were measured according to the above-described methods. The results are shown in Table 1.
- Example 2 (Production of synthetic polyisoprene latex (f-2))
- the time required to be processed in the emulsifier 20 is set as the processing time (that is, the second dispersion process of two passes), except that the second dispersion process is performed continuously, the same as in Example 1,
- a synthetic polyisoprene latex (f-2) was produced and evaluated in the same manner. The results are shown in Table 1.
- a dispersion process and a second dispersion process were performed.
- Example 3 (Production of synthetic polyisoprene latex (f-3))
- f-3) was produced and evaluated in the same manner. The results are shown in Table 1.
- Comparative Example 1 (Production of synthetic polyisoprene latex (f-4)) A synthetic polyisoprene latex (f-4) was produced and evaluated in the same manner as in Example 1 except that the second dispersion treatment was not performed. The results are shown in Table 1.
- Comparative Example 2 (Production of synthetic polyisoprene latex (f-5))
- the synthetic polyisoprene latex (f-5) was treated in the same manner as in Example 1 except that the second dispersion treatment was performed with the treatment time as the treatment time (that is, the second dispersion treatment for one pass). ) And evaluated in the same manner.
- a dispersion process and a second dispersion process were performed.
- Comparative Example 3 (Production of synthetic polyisoprene latex (f-6))
- the first in the first dispersion treatment is carried out using only the mixer 10 (trade name “Multiline Mixer MS26-MMR-5.5L” (manufactured by Satake Chemical Machinery Co., Ltd.)) without using the rotor-stator type emulsifier 20.
- F 1 5.35 ⁇ 10 6
- a synthetic polyisoprene latex (f-6) was produced in the same manner as in Example 1 except that the second dispersion treatment was performed using the time as the treatment time (that is, the 19-pass second dispersion treatment). Evaluation was performed.
- a dispersion process and a second dispersion process were performed.
- latex having a particle size distribution of 5 ⁇ m or more in the particle size distribution determined on the basis of the number of synthetic rubber particles contained in the latex is less than 3,000 ppm by weight.
- the agglomerate content was kept low, and a dip-molded article having high tensile strength and elongation was obtained (Examples 1 to 3).
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Abstract
Description
本発明の合成ゴムのラテックスにおいて、前記合成ゴムが、合成ポリイソプレンおよび/またはスチレン-イソプレン-スチレンブロック共重合体であることが好ましい。
本発明によれば、上記のラテックス組成物からなる膜成形体が提供される。
また、本発明によれば、基材上に、上記の合成ゴムのラテックスを用いて形成される接着剤層を備える接着剤層形成基材が提供される。
前記混合物に対して、ローター・ステーター式の乳化機にて第1分散処理を行うことで、粗分散乳化液を得る第2工程と、
前記粗分散乳化液に対して、ローター・ステーター式の乳化機にて第2分散処理を行うことで、微分散乳化液を得る第3工程と、を備え、
下記式(1)で求められる分散エネルギーFに関し、前記第2工程の第1分散処理において、前記混合物に与えられる分散エネルギーFを第1分散エネルギーF1とし、前記第3工程の第2分散処理において、前記粗分散乳化液に与えられる分散エネルギーFを第2分散エネルギーF2とし、前記第1分散エネルギーF1と第2分散エネルギーF2との合計を合計分散エネルギーFtotalとした場合に、
前記第1分散エネルギーF1が8.0×107以上、前記合計分散エネルギーFtotalが1.0×108以上となるように、前記第1分散処理および前記第2分散処理を行う合成ゴムのラテックスの製造方法が提供される。
F=(V×N×P×S)/Q2 (1)
(上記式(1)中、Vは、ローターの周速(m/s)、Nは、乳化機の合成周波数(Hz)、Pは、乳化室の容積(m3)、Sは、ローターおよびステーターに備えられたスリットの断面積(m2)、Qは、分散処理速度(m3/s))
本発明の合成ゴムのラテックスの製造方法において、前記第2分散エネルギーF2が2.0×107以上であることが好ましい。
本発明の合成ポリイソプレンラテックスは、イソプレンを重合して得られる合成ポリイソプレンのラテックスである。
本発明の合成ポリイソプレンラテックスに含まれる、合成ポリイソプレンは、イソプレンの単独重合体であってもよいし、イソプレンと共重合可能な他のエチレン性不飽和単量体とを共重合したものであってもよい。合成ポリイソプレン中のイソプレン単位の含有量は、柔軟で、引張強度に優れるディップ成形体が得られやすいことから、全単量体単位に対して、好ましくは70重量%以上、より好ましくは90重量%以上、さらに好ましくは95重量%以上、特に好ましくは100重量%(イソプレンの単独重合体)である。
F=(V×N×P×S)/Q2 (1)
Nは、乳化機の合成周波数(Hz)であり、ローター・ステーター対の組み合わせ数と、各ローター・ステーターに備えられたスリットの数に依存するものである。一例を挙げると、外径30mmで周速が19m/s、ローター・ステーター対が1個であり、ローターのスリット数が8、ステーターのスリットの数が12である場合には、合成周波数は19,000Hzとなる。
Pは、乳化室の容積(m3)であり、具体的には、ローター・ステーター対が配された空間内において、被分散物が滞留可能な部分における容積であり、乳化室内のローターおよびステーター等を含んだ容積である。
Sは、ローターおよびステーターに備えられたスリットの断面積(m2)であり、具体的には、スリット1個当たりの断面積の総和である。
また、Qは、分散処理速度(m3/s)であり、被分散物の流速により決定される。
本発明のスチレン-イソプレン-スチレンブロック共重合体ラテックスは、スチレンとイソプレンのブロック共重合体のラテックスである。
本発明のラテックス組成物は、上述した本発明の合成ゴムのラテックスに、加硫剤および/または加硫促進剤を配合してなるものである。
酸化亜鉛の含有量は、特に限定されないが、ラテックス中に含まれる合成ゴム100重量部に対して、好ましくは0.1~5重量部、より好ましくは0.2~2重量部である。酸化亜鉛の含有量を上記範囲とすることにより、乳化安定性を良好なものとしながら、得られるディップ成形体などの膜成形体の引張強度をより高めることができる。
そして、前架橋した後、ディップ成形などの成形に供されるまで、好ましくは10~30℃の温度で貯蔵することが好ましい。高温のまま貯蔵すると、得られるディップ成形体などの膜成形体の引張強度が低下する場合がある。
本発明の膜成形体は、本発明のラテックス組成物からなる膜状の成形体である。本発明の膜成形体の膜厚は、好ましくは0.03~0.50mm、より好ましくは0.05~0.40mm、特に好ましくは0.08~0.30mmである。
架橋時の加熱条件は、特に限定されないが、好ましくは60~150℃、より好ましくは100~130℃の加熱温度で、好ましくは10~120分の加熱時間である。
加熱の方法は、特に限定されないが、オーブンの中で温風で加熱する方法、赤外線を照射して加熱する方法などがある。
本発明の接着剤層形成基材は、基材上に、上述した本発明の合成ゴムのラテックスを用いて形成される接着剤層を備える、基材と、接着剤層との複合材料である。
合成ポリイソプレンラテックス中に含まれる粒子の個数基準の粒子径分布における、粒子径が5μm以上である粒子の含有率は、細孔電気抵抗式粒度分布測定装置(商品名「コールターカウンター マルチサイザー3」、ベックマンコールター社製)を使用して測定した。
ASTMD1417-10の「Determination of Mechanical Stability」に記載の方法に準拠して以下の方法により、ラテックスの機械的安定性を評価した。
すなわち、「MS-5114」(上島製作所製)または「LL5110NA MK3」(Source 2 trade Ltd製)を使用して機械的安定性を測定した。なお、測定に際しては、撹拌ディスクとして、ASTM D1076-10に規定されている直径が20.83(mm)±0.03(mm)、厚みが1.57(mm)±0.05(mm)のものを使用した。また、ガラスビーカーはASTM D1417-10に規定されているガラス製ビーカーで内径が57.8(mm)±1(mm)であるものを使用した。具体的な測定方法としては、合成ポリイソプレンラテックス50gを精秤し、回転数14,000rpmの条件で30分間撹拌した。そして、撹拌後の合成ポリイソプレンラテックスを、80メッシュ金網にて濾過し、その後メッシュを石鹸水で洗浄し、蒸留水で石鹸を洗い流した後、105℃で2時間乾燥した。乾燥後、金網上の残渣物を秤量して、合成ポリイソプレンラテックス50gに対する比率(単位:重量%)を計算し、その値により機械的安定性を評価した。値が小さいほど、機械的安定性に優れ、ラテックスとしての貯蔵安定性に優れるものと判断できる。
アルミ皿(重量:X1)にラテックス組成物2gを精秤し(重量:X2)、これを105℃の熱風乾燥器内で2時間乾燥させた。次いで、デシケーター内で冷却した後、アルミ皿ごと重量を測定し(重量:X3)、下記の計算式にしたがって、ラテックス組成物の固形分濃度を算出した。
固形分濃度(重量%)=(X3-X1)×100/X2
次いで、ラテックス組成物を約100g精秤した後、重量既知の200メッシュのSUS製金網でろ過し、金網上の凝集物を数回水洗して、ラテックス組成物を除去した。これを、105℃で60分間、乾燥した後、その乾燥重量を測定し、下記式に基づいて、ラテックス組成物中の凝集物含有量(単位:重量%)を求めた。
凝集物含有量={(α-β)/(γ×Δ)}×10,000
ここで、αは乾燥後の金網及び乾燥凝集物の重量、βは金網の重量、γはラテックス組成物の重量、Δはラテックス組成物の固形分濃度をそれぞれ示す。
ディップ成形体の引張強度および伸びは、ASTM D412に基づいて測定した。具体的には、ディップ成形体をダンベル(Die-C)で打ち抜き、測定用試験片を作製し、得られた試験片をテンシロン万能試験機(オリエンテック社製「RTC-1225A」)で引張速度500mm/minで引っ張り、破断直前の引張強度(単位:MPa)、および破断直前の伸び(単位:%)を測定した。
(合成ポリイソプレンラテックス(f-1)の製造)
重量平均分子量が1,300,000の合成ポリイソプレン(商品名「NIPOL IR2200L」、日本ゼオン社製、チーグラー系重合触媒を用いて得られたイソプレンの単独重合体、シス結合単位量98重量%)をシクロヘキサンと混合し、攪拌しながら温度を60℃に昇温して溶解し、合成ポリイソプレンのシクロヘキサン溶液(a)を調製した。
得られた合成ポリイソプレンラテックス(f-1)を撹拌しながら、合成ポリイソプレンラテックス(f-1)中の合成ポリイソプレン100部に対して、固形分換算で、酸化亜鉛1.5部、硫黄1.5部、老化防止剤(商品名「Wingstay L」、グッドイヤー社製)3部、ジエチルジチオカルバミン酸亜鉛0.3部、ジブチルジチオカルバミン酸亜鉛0.5部、およびメルカプトベンゾチアゾール亜鉛0.7部となるように、各配合剤の水分散液を添加した後、水酸化カリウム水溶液を添加して、pHを10.5に調整することで、ラテックス組成物を得た。その後、得られたラテックス組成物を、30℃に調整された恒温水槽で48時間熟成した。そして、得られた熟成後のラテックス組成物について、凝集物の含有量を測定した。
市販のセラミック製手型(シンコー社製)を洗浄し、70℃のオーブン内で予備加熱した後、18重量%の硝酸カルシウムおよび0.05重量%のポリオキシエチレンラウリルエーテル(商品名「エマルゲン109P」、花王社製)を含む凝固剤水溶液に5秒間浸漬し、取り出した。次いで、凝固剤で被覆された手型を70℃のオーブン内で30分以上乾燥した。
(合成ポリイソプレンラテックス(f-2)の製造)
第2分散処理における第2分散エネルギーF2がF2=5.26×107となるように、粗分散乳化液(c-1)の体積に対して2倍の体積が、ローター・ステーター式乳化機20にて処理されるようになるだけ時間を処理時間として(すなわち、2パスの第2分散処理)、連続して第2分散処理を行った以外は、実施例1と同様にして、合成ポリイソプレンラテックス(f-2)を製造し、同様に評価を行った。結果を表1に示す。すなわち、実施例2では、合計分散エネルギーFtotalがFtotal=1.38×108(F1+F2=8.53×107+5.26×107)となるような条件で、第1分散処理および第2分散処理を行った。
上記にて得られた合成ポリイソプレンラテックス(f-2)を使用した以外は、実施例1と同様にして、ラテックス組成物およびディップ成形体を得て、同様に評価を行った。結果を表1に示す。
(合成ポリイソプレンラテックス(f-3)の製造)
第2分散処理における第2分散エネルギーF2がF2=2.63×107となるように、粗分散乳化液(c-1)の体積と同量の体積が、ローター・ステーター式乳化機20にて処理されるようになるだけ時間を処理時間として(すなわち、1パスの第2分散処理)、第2分散処理を行った以外は、実施例1と同様にして、合成ポリイソプレンラテックス(f-3)を製造し、同様に評価を行った。結果を表1に示す。すなわち、実施例3では、合計分散エネルギーFtotalがFtotal=1.12×108(F1+F2=8.53×107+2.63×107)となるような条件で、第1分散処理および第2分散処理を行った。
上記にて得られた合成ポリイソプレンラテックス(f-3)を使用した以外は、実施例1と同様にして、ラテックス組成物およびディップ成形体を得て、同様に評価を行った。結果を表1に示す。
(合成ポリイソプレンラテックス(f-4)の製造)
第2分散処理を行わなかった以外は、実施例1と同様にして、合成ポリイソプレンラテックス(f-4)を製造し、同様に評価を行った。結果を表1に示す。
上記にて得られた合成ポリイソプレンラテックス(f-4)を使用した以外は、実施例1と同様にして、ラテックス組成物およびディップ成形体を得て、同様に評価を行った。結果を表1に示す。
(合成ポリイソプレンラテックス(f-5)の製造)
第1分散処理における第1分散エネルギーF1がF1=2.63×107となるように、第1分散処理を行って、粗分散乳化液(c-5)を得るとともに、第2分散処理における第2分散エネルギーF2がF2=2.63×107となるように、粗分散乳化液(c-5)の体積と同量の体積が、ローター・ステーター式乳化機20にて処理されるようになるだけ時間を処理時間として(すなわち、1パスの第2分散処理)、第2分散処理を行った以外は、実施例1と同様にして、合成ポリイソプレンラテックス(f-5)を製造し、同様に評価を行った。すなわち、比較例2では、合計分散エネルギーFtotalがFtotal=5.26×107(F1+F2=2.63×107+2.63×107)となるような条件で、第1分散処理および第2分散処理を行った。
上記にて得られた合成ポリイソプレンラテックス(f-5)を使用した以外は、実施例1と同様にして、ラテックス組成物およびディップ成形体を得て、同様に評価を行った。なお、比較例2においては、ディップ成形体を得る際には、ラテックス組成物中の凝集物をろ過により除去した後に、ディップ成形を行った。結果を表1に示す。
(合成ポリイソプレンラテックス(f-6)の製造)
ローター・ステーター式乳化機20を使用せず、ミキサー10(商品名「マルチラインミキサーMS26-MMR-5.5L」(佐竹化学機械工業社製))のみを使用して第1分散処理における第1分散エネルギーF1がF1=5.35×106となるように、第1分散処理を行って、粗分散乳化液(c-6)を得るとともに、第2分散処理における第2分散エネルギーF2がF2=1.02×108となるように、粗分散乳化液(c-6)の体積の19倍の体積が、ローター・ステーター式乳化機20にて処理されるようになるだけ時間を処理時間として(すなわち、19パスの第2分散処理)、第2分散処理を行った以外は、実施例1と同様にして、合成ポリイソプレンラテックス(f-6)を製造し、同様に評価を行った。すなわち、比較例3では、合計分散エネルギーFtotalがFtotal=1.07×108(F1+F2=5.35×106+1.02×108)となるような条件で、第1分散処理および第2分散処理を行った。
上記にて得られた合成ポリイソプレンラテックス(f-6)を使用した以外は、実施例1と同様にして、ラテックス組成物およびディップ成形体を得て、同様に評価を行った。なお、比較例3においては、ディップ成形体を得る際には、ラテックス組成物中の凝集物をろ過により除去した後に、ディップ成形を行った。結果を表1に示す。
また、比較例3については、得られたラテックスの安定性が極めて低く、粒子径分布における粒子径が5μm以上の粒子の含有率の測定を行うことができず、また、ラテックス組成物とした際における凝集物量も極めて多くなる結果となった。
20…ローター・ステーター式乳化機
30…貯留タンク
40…還流配管
50…蒸留タンク
Claims (7)
- 合成ゴムのラテックスであって、
前記ラテックス中に含まれる合成ゴム粒子の個数基準で求めた粒子径分布における粒子径が5μm以上の粒子の含有率が、3,000重量ppm未満である合成ゴムのラテックス。 - 前記合成ゴムが、合成ポリイソプレンおよび/またはスチレン-イソプレン-スチレンブロック共重合体である請求項1に記載の合成ゴムのラテックス。
- 請求項1または2に記載の合成ゴムのラテックスと、加硫剤および/または加硫促進剤とを含有するラテックス組成物。
- 請求項3に記載のラテックス組成物からなる膜成形体。
- 基材上に、請求項1または2に記載の合成ゴムのラテックスを用いて形成される接着剤層を備える接着剤層形成基材。
- 合成ゴムが有機溶媒に溶解または分散してなる合成ゴムの重合体溶液または重合体分散液と、界面活性剤が水に溶解または分散してなる界面活性剤水溶液または界面活性剤分散液とを混合することで混合物を得る第1工程と、
前記混合物に対して、ローター・ステーター式の乳化機にて第1分散処理を行うことで、粗分散乳化液を得る第2工程と、
前記粗分散乳化液に対して、ローター・ステーター式の乳化機にて第2分散処理を行うことで、微分散乳化液を得る第3工程と、を備え、
下記式(1)で求められる分散エネルギーFに関し、前記第2工程の第1分散処理において、前記混合物に与えられる分散エネルギーFを第1分散エネルギーF1とし、前記第3工程の第2分散処理において、前記粗分散乳化液に与えられる分散エネルギーFを第2分散エネルギーF2とし、前記第1分散エネルギーF1と第2分散エネルギーF2との合計を合計分散エネルギーFtotalとした場合に、
前記第1分散エネルギーF1が8.0×107以上、前記合計分散エネルギーFtotalが1.0×108以上となるように、前記第1分散処理および前記第2分散処理を行う合成ゴムのラテックスの製造方法。
F=(V×N×P×S)/Q2 (1)
(上記式(1)中、Vは、ローターの周速(m/s)、Nは、乳化機の合成周波数(Hz)、Pは、乳化室の容積(m3)、Sは、ローターおよびステーターに備えられたスリットの断面積(m2)、Qは、分散処理速度(m3/s)) - 前記第2分散エネルギーF2が2.0×107以上である請求項6に記載の合成ゴムのラテックスの製造方法。
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KR (1) | KR20180124852A (ja) |
CN (1) | CN108779257B (ja) |
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WO (1) | WO2017154736A1 (ja) |
Cited By (3)
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WO2020129765A1 (ja) * | 2018-12-20 | 2020-06-25 | 日本ゼオン株式会社 | ラテックスの製造方法および該製造方法で得られたラテックスを用いた膜成形体、ディップ成形体および接着剤層形成基材の製造方法 |
WO2020129766A1 (ja) * | 2018-12-20 | 2020-06-25 | 日本ゼオン株式会社 | ラテックスの製造方法及び該ラテックスを用いた成形体の製造方法 |
WO2021132460A1 (ja) * | 2019-12-24 | 2021-07-01 | 昭和電工株式会社 | クロロプレン共重合体ラテックス組成物及びその成形物 |
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US10479874B1 (en) * | 2018-02-15 | 2019-11-19 | Shimon Amdur | Latex compositions and antistatic articles manufactured therefrom |
JP7325993B2 (ja) * | 2019-03-29 | 2023-08-15 | 日東電工株式会社 | エマルションの製造方法および製造装置 |
AU2020407625B2 (en) * | 2019-12-20 | 2023-10-05 | Church & Dwight Co., Inc. | Polymer compositions and products formed therewith |
CN112143154B (zh) * | 2020-09-28 | 2023-02-17 | 湖北分聚新材料有限公司 | 应用于手套的聚氨酯改性丁腈胶乳的制备方法 |
CN112280130A (zh) * | 2020-10-31 | 2021-01-29 | 淄博鲁华泓锦新材料股份有限公司 | 用聚异戊二烯胶乳制备胶乳膜制品的方法 |
CN113550024B (zh) * | 2021-06-24 | 2022-03-11 | 中国热带农业科学院农产品加工研究所 | 一种超细高弹乳胶丝的制备方法 |
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WO2020129765A1 (ja) * | 2018-12-20 | 2020-06-25 | 日本ゼオン株式会社 | ラテックスの製造方法および該製造方法で得られたラテックスを用いた膜成形体、ディップ成形体および接着剤層形成基材の製造方法 |
WO2020129766A1 (ja) * | 2018-12-20 | 2020-06-25 | 日本ゼオン株式会社 | ラテックスの製造方法及び該ラテックスを用いた成形体の製造方法 |
CN113166429A (zh) * | 2018-12-20 | 2021-07-23 | 日本瑞翁株式会社 | 胶乳的制造方法及使用由该制造方法得到的胶乳的膜成型体、浸渍成型体及粘接剂层形成基材的制造方法 |
CN113166428A (zh) * | 2018-12-20 | 2021-07-23 | 日本瑞翁株式会社 | 胶乳的制造方法及使用了该胶乳的成型体的制造方法 |
JPWO2020129766A1 (ja) * | 2018-12-20 | 2021-11-18 | 日本ゼオン株式会社 | ラテックスの製造方法及び該ラテックスを用いた成形体の製造方法 |
JPWO2020129765A1 (ja) * | 2018-12-20 | 2021-11-18 | 日本ゼオン株式会社 | ラテックスの製造方法および該製造方法で得られたラテックスを用いた膜成形体、ディップ成形体および接着剤層形成基材の製造方法 |
JP7276353B2 (ja) | 2018-12-20 | 2023-05-18 | 日本ゼオン株式会社 | ラテックスの製造方法及び該ラテックスを用いた成形体の製造方法 |
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CN113166428B (zh) * | 2018-12-20 | 2024-03-01 | 日本瑞翁株式会社 | 胶乳的制造方法及使用了该胶乳的成型体的制造方法 |
WO2021132460A1 (ja) * | 2019-12-24 | 2021-07-01 | 昭和電工株式会社 | クロロプレン共重合体ラテックス組成物及びその成形物 |
Also Published As
Publication number | Publication date |
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EP3428217A4 (en) | 2019-10-23 |
US20190031861A1 (en) | 2019-01-31 |
US10774201B2 (en) | 2020-09-15 |
CN108779257B (zh) | 2021-10-01 |
JPWO2017154736A1 (ja) | 2019-01-10 |
KR20180124852A (ko) | 2018-11-21 |
CN108779257A (zh) | 2018-11-09 |
EP3428217A1 (en) | 2019-01-16 |
BR112018067763A2 (pt) | 2019-01-15 |
JP6947162B2 (ja) | 2021-10-13 |
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