WO2018079786A1 - Procédé de fabrication de caoutchouc acrylique - Google Patents

Procédé de fabrication de caoutchouc acrylique Download PDF

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Publication number
WO2018079786A1
WO2018079786A1 PCT/JP2017/039180 JP2017039180W WO2018079786A1 WO 2018079786 A1 WO2018079786 A1 WO 2018079786A1 JP 2017039180 W JP2017039180 W JP 2017039180W WO 2018079786 A1 WO2018079786 A1 WO 2018079786A1
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Prior art keywords
acrylic rubber
weight
ethylene oxide
monomer
parts
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PCT/JP2017/039180
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English (en)
Japanese (ja)
Inventor
奨 佐藤
智士 山之上
増田　浩文
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日本ゼオン株式会社
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Priority to JP2018506446A priority Critical patent/JP6394834B1/ja
Publication of WO2018079786A1 publication Critical patent/WO2018079786A1/fr

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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
    • C08F2/00—Processes of polymerisation
    • C08F2/12—Polymerisation in non-solvents
    • C08F2/16—Aqueous medium
    • C08F2/22—Emulsion polymerisation
    • C08F2/24—Emulsion polymerisation with the aid of emulsifying agents
    • 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
    • C08F20/00—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride, ester, amide, imide or nitrile thereof
    • C08F20/02—Monocarboxylic acids having less than ten carbon atoms, Derivatives thereof
    • C08F20/10—Esters
    • C08F20/12—Esters of monohydric alcohols or phenols
    • C08F20/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
    • C08F20/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
    • 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
    • C08F6/00—Post-polymerisation treatments
    • C08F6/14—Treatment of polymer emulsions
    • C08F6/22—Coagulation

Definitions

  • the present invention relates to a method for producing acrylic rubber, and more particularly, to a method for producing acrylic rubber capable of providing a crosslinked rubber having excellent water resistance.
  • Acrylic rubber is a polymer mainly composed of an acrylate ester and is generally known as a rubber excellent in heat resistance, oil resistance and ozone resistance, and is widely used in fields related to automobiles.
  • Such an acrylic rubber is usually obtained by emulsion polymerization of a monomer mixture constituting the acrylic rubber, coagulating the resulting emulsion polymerization solution by adding a coagulant, and drying the hydrous crumb obtained by coagulation. (See, for example, Patent Document 1).
  • the present invention has been made in view of such a situation, and an object of the present invention is to provide a method for producing acrylic rubber which can give a crosslinked rubber having excellent water resistance.
  • the present inventors have added an ethylene oxide polymer to an emulsion polymerization liquid before coagulation obtained by emulsion polymerization of a monomer for forming an acrylic rubber. After the addition, it was found that the above-mentioned object can be achieved by solidification at a solidification temperature of 78 ° C. or higher, and the present invention has been completed.
  • a method for producing an acrylic rubber wherein the monomer for forming the acrylic rubber is subjected to emulsion polymerization to obtain an emulsion polymerization solution, and before solidification.
  • a coagulating step to provide an acrylic rubber manufacturing method.
  • a method for producing an acrylic rubber wherein the monomer for forming the acrylic rubber is mixed with an emulsifier and water to obtain a monomer emulsion.
  • a step of adding an ethylene oxide polymer to the monomer emulsion prepared in the emulsion preparation step and an ethylene oxide polymer addition step in which the ethylene oxide polymer is added in the ethylene oxide polymer addition step A step of obtaining an emulsion polymerization solution by emulsion polymerization of monomers contained in the body emulsion, and a coagulation step of obtaining a water-containing crumb by adding a coagulant to the emulsion polymerization solution and solidifying the emulsion polymerization solution.
  • a method for producing an acrylic rubber is provided.
  • the ethylene oxide polymer preferably has a weight average molecular weight of 10,000 or more, more preferably 10,000 to 200,000, and even more preferably 20,000 to 120,000.
  • the ethylene oxide polymer is preferably an ethylene oxide homopolymer.
  • the addition amount of the ethylene oxide polymer in the ethylene oxide polymer addition step is 0.005 to 1 weight with respect to 100 parts by weight of the monomer for forming the acrylic rubber. Parts, preferably 0.01 to 0.1 parts by weight, more preferably 0.02 to 0.06 parts by weight.
  • the solidification temperature in the solidification step is preferably 78 to 90 ° C.
  • the emulsion polymerization of the monomer is preferably performed in the presence of a nonionic emulsifier and an anionic emulsifier. More preferably, the weight ratio of the functional emulsifier is 50/50 to 75/25.
  • a monomer, a polymerization initiator, and a reducing agent for forming the acrylic rubber are continuously dropped into the polymerization reaction system from the start of the polymerization reaction to an arbitrary time. It is preferable to carry out the emulsion polymerization reaction.
  • the monomer for forming the acrylic rubber is in the state of a monomer emulsion mixed with an emulsifier and water, from the start of the polymerization reaction to an arbitrary time from the polymerization reaction system. It is preferable to carry out the emulsion polymerization reaction while continuously dropping the solution.
  • blending a crosslinking agent with the acrylic rubber obtained by the said manufacturing method is provided. Furthermore, according to this invention, the manufacturing method of the rubber crosslinked material provided with the process of bridge
  • the acrylic rubber manufactured by the manufacturing method of this invention is demonstrated.
  • the acrylic rubber produced by the production method of the present invention is a (meth) acrylic acid ester as a main component in the molecule (in the present invention, it has 50% by weight or more in the total monomer units of rubber).
  • Monomer meaning acrylic acid ester monomer and / or methacrylic acid ester monomer. The same applies to methyl (meth) acrylate.
  • the (meth) acrylic acid ester monomer that forms the (meth) acrylic acid ester monomer unit that is the main component of the acrylic rubber produced by the production method of the present invention is not particularly limited. ) Acrylic acid alkyl ester monomer and (meth) acrylic acid alkoxyalkyl ester monomer.
  • the (meth) acrylic acid alkyl ester monomer is not particularly limited, but is preferably an ester of an alkanol having 1 to 8 carbon atoms and (meth) acrylic acid, specifically, methyl (meth) acrylate, ( (Meth) ethyl acrylate, (meth) acrylic acid n-propyl, (meth) acrylic acid isopropyl, (meth) acrylic acid n-butyl, (meth) acrylic acid isobutyl, (meth) acrylic acid n-hexyl, (meth) Examples include 2-ethylhexyl acrylate and cyclohexyl (meth) acrylate.
  • ethyl (meth) acrylate and n-butyl (meth) acrylate are preferable, and ethyl acrylate and n-butyl acrylate are particularly preferable. These can be used alone or in combination of two or more.
  • the (meth) acrylic acid alkoxyalkyl ester monomer is not particularly limited, but an ester of an alkoxyalkyl alcohol having 2 to 8 carbon atoms and (meth) acrylic acid is preferable.
  • (meth) acrylic acid Methoxymethyl, ethoxymethyl (meth) acrylate, 2-methoxyethyl (meth) acrylate, 2-ethoxyethyl (meth) acrylate, 2-propoxyethyl (meth) acrylate, 2-butoxyethyl (meth) acrylate , 3-methoxypropyl (meth) acrylate, 4-methoxybutyl (meth) acrylate, and the like.
  • 2-ethoxyethyl (meth) acrylate and 2-methoxyethyl (meth) acrylate are preferable, and 2-ethoxyethyl acrylate and 2-methoxyethyl acrylate are particularly preferable. These can be used alone or in combination of two or more.
  • the content of the (meth) acrylic acid ester monomer unit in the acrylic rubber produced by the production method of the present invention is usually from 50 to 99.9% by weight, preferably from 60 to 99.5% by weight. Preferably, it is 70 to 99.5% by weight. If the content of the (meth) acrylic acid ester monomer unit is too small, the weather resistance, heat resistance and oil resistance of the resulting rubber cross-linked product may be lowered. There is a risk that the heat resistance of the object will decrease.
  • (meth) acrylic acid ester monomer unit (meth) acrylic acid alkyl ester monomer unit 30 to 100% by weight, and (meth) acrylic It is preferable to use an acid alkoxyalkyl ester monomer unit comprising 70 to 0% by weight.
  • the acrylic rubber produced by the production method of the present invention may contain a crosslinkable monomer unit, if necessary, in addition to the (meth) acrylic acid alkyl ester monomer unit.
  • the crosslinkable monomer that forms the crosslinkable monomer unit is not particularly limited. For example, an ⁇ , ⁇ -ethylenically unsaturated carboxylic acid monomer; a monomer having an epoxy group; a halogen atom Monomer; diene monomer; and the like.
  • the ⁇ , ⁇ -ethylenically unsaturated carboxylic acid monomer that forms the ⁇ , ⁇ -ethylenically unsaturated carboxylic acid monomer unit is not particularly limited, but examples thereof include ⁇ , ⁇ - having 3 to 12 carbon atoms.
  • the acrylic rubber By using the ⁇ , ⁇ -ethylenically unsaturated carboxylic acid monomer, the acrylic rubber can be converted into a carboxyl group-containing acrylic rubber having a carboxyl group as a crosslinking point, and thus a rubber cross-linked product can be obtained. Further, the compression set resistance can be further improved.
  • ⁇ , ⁇ -ethylenically unsaturated monocarboxylic acid having 3 to 12 carbon atoms include acrylic acid, methacrylic acid, ⁇ -ethylacrylic acid, crotonic acid, and cinnamic acid.
  • ⁇ , ⁇ -ethylenically unsaturated dicarboxylic acid having 4 to 12 carbon atoms include butenedionic acid such as fumaric acid and maleic acid; itaconic acid; citraconic acid; chloromaleic acid;
  • monoesters of ⁇ , ⁇ -ethylenically unsaturated dicarboxylic acids having 4 to 12 carbon atoms and alkanols having 1 to 8 carbon atoms include monomethyl fumarate, monoethyl fumarate, mono n-butyl fumarate, malein Butenedionic acid mono-chain alkyl esters such as monomethyl acid, monoethyl maleate, and mono-n-butyl maleate; monocyclopentyl fumarate, monocyclohexyl fumarate, monocyclohexenyl fumarate, monocyclopentyl maleate, monocyclohexyl maleate, maleate And butenedionic acid monoesters having an alicyclic structure such
  • Epoxy group containing (meth) acrylic acid ester such as glycidyl (meth) acrylate
  • Epoxy group containing ethers such as allyl glycidyl ether and vinyl glycidyl ether; Is mentioned.
  • unsaturated alcohol ester of a halogen-containing saturated carboxylic acid For example, unsaturated alcohol ester of a halogen-containing saturated carboxylic acid, (meth) acrylic acid haloalkyl ester, (meth) acrylic acid haloacyloxyalkyl ester, (meth) acrylic Examples include acid (haloacetylcarbamoyloxy) alkyl esters, halogen-containing unsaturated ethers, halogen-containing unsaturated ketones, halomethyl group-containing aromatic vinyl compounds, halogen-containing unsaturated amides, and haloacetyl group-containing unsaturated monomers.
  • the unsaturated alcohol ester of a halogen-containing saturated carboxylic acid include vinyl chloroacetate, vinyl 2-chloropropionate, and allyl chloroacetate.
  • Specific examples of (meth) acrylic acid haloalkyl esters include chloromethyl (meth) acrylate, 1-chloroethyl (meth) acrylate, 2-chloroethyl (meth) acrylate, 1,2-dichloroethyl (meth) acrylate. , 2-chloropropyl (meth) acrylate, 3-chloropropyl (meth) acrylate, and 2,3-dichloropropyl (meth) acrylate.
  • (meth) acrylic acid haloacyloxyalkyl esters include 2- (chloroacetoxy) ethyl (meth) acrylate, 2- (chloroacetoxy) propyl (meth) acrylate, and 3- (chloro) (meth) acrylic acid. Acetoxy) propyl and 3- (hydroxychloroacetoxy) propyl (meth) acrylate.
  • (meth) acrylic acid (haloacetylcarbamoyloxy) alkyl esters include 2- (chloroacetylcarbamoyloxy) ethyl (meth) acrylate and 3- (chloroacetylcarbamoyloxy) propyl (meth) acrylate Is mentioned.
  • halogen-containing unsaturated ether examples include chloromethyl vinyl ether, 2-chloroethyl vinyl ether, 3-chloropropyl vinyl ether, 2-chloroethyl allyl ether, and 3-chloropropyl allyl ether.
  • halogen-containing unsaturated ketone examples include 2-chloroethyl vinyl ketone, 3-chloropropyl vinyl ketone, and 2-chloroethyl allyl ketone.
  • halomethyl group-containing aromatic vinyl compound examples include p-chloromethylstyrene, m-chloromethylstyrene, o-chloromethylstyrene, and p-chloromethyl- ⁇ -methylstyrene.
  • halogen-containing unsaturated amide examples include N-chloromethyl (meth) acrylamide.
  • haloacetyl group-containing unsaturated monomer examples include 3- (hydroxychloroacetoxy) propyl allyl ether and p-vinylbenzyl chloroacetate.
  • Examples of the diene monomer include conjugated diene monomers and non-conjugated diene monomers.
  • Specific examples of the conjugated diene monomer include 1,3-butadiene, isoprene, and piperylene.
  • Specific examples of the non-conjugated diene monomer include ethylidene norbornene, dicyclopentadiene, dicyclopentadienyl (meth) acrylate, and 2-dicyclopentadienyl ethyl (meth) acrylate. .
  • the acrylic rubber when an ⁇ , ⁇ -ethylenically unsaturated carboxylic acid monomer is used, the acrylic rubber can be a carboxyl group-containing acrylic rubber. By making the acrylic rubber into a carboxyl group-containing acrylic rubber, it is possible to improve the compression set resistance while improving the oil resistance and heat resistance.
  • the content of the crosslinkable monomer unit in the acrylic rubber produced by the production method of the present invention is preferably 0.1 to 10% by weight, more preferably 0.5 to 7% by weight, still more preferably 0. .5-5% by weight.
  • the acrylic rubber produced by the production method of the present invention includes (meth) acrylic acid ester monomer units and other monomer units copolymerizable with these in addition to the crosslinkable monomer units used as necessary. You may have a unit of a mer.
  • Such other copolymerizable monomers include aromatic vinyl monomers, ⁇ , ⁇ -ethylenically unsaturated nitrile monomers, acrylamide monomers, and other olefin monomers. Can be mentioned.
  • aromatic vinyl monomers examples include styrene, ⁇ -methylstyrene, divinylbenzene and the like.
  • Examples of the ⁇ , ⁇ -ethylenically unsaturated nitrile monomer include acrylonitrile and methacrylonitrile.
  • Examples of acrylamide monomers include acrylamide and methacrylamide.
  • Other olefinic monomers include ethylene, propylene, vinyl chloride, vinylidene chloride, vinyl acetate, ethyl vinyl ether, butyl vinyl ether, and the like.
  • styrene, acrylonitrile, methacrylonitrile, ethylene and vinyl acetate are preferable, and acrylonitrile, methacrylonitrile and ethylene are more preferable.
  • the method for producing the acrylic rubber of the present invention comprises: An emulsion polymerization step of obtaining an emulsion polymerization liquid by emulsion polymerization of a monomer for forming an acrylic rubber; and An ethylene oxide polymer addition step of containing an ethylene oxide polymer in the emulsion polymerization liquid before coagulation; A coagulation step of obtaining a hydrous crumb by adding a coagulant to the emulsion polymerization liquid adjusted to a temperature of 78 ° C. or higher and coagulating.
  • the emulsion polymerization step is performed by previously mixing a monomer for forming the acrylic rubber with an emulsifier and water to obtain a monomer emulsion (emulsion solution).
  • Preparation step in the state of the resulting monomer emulsion, emulsion polymerization can be carried out (emulsion polymerization step).
  • emulsion polymerization step for the monomer emulsion, It can also be set as the structure which performs emulsion polymerization, after adding an ethylene oxide type polymer.
  • the emulsion polymerization step in the production method of the present invention is a step of obtaining an emulsion polymerization solution by emulsion polymerization of a monomer for forming an acrylic rubber.
  • an ordinary method may be used, and an emulsifier, a polymerization initiator, a polymerization terminator and the like can be used according to a conventional method.
  • the emulsifier is not particularly limited.
  • polyoxyethylene alkyl ethers such as polyoxyethylene dodecyl ether, polyoxyethylene alkyl phenol ethers such as polyoxyethylene nonylphenyl ether, and polyoxyethylene alkyls such as polyoxyethylene stearate.
  • Nonionic emulsifiers such as esters, polyoxyethylene sorbitan alkyl esters, polyoxyethylene polyoxypropylene copolymers; salts of fatty acids such as myristic acid, palmitic acid, oleic acid, linolenic acid, alkylbenzene sulfones such as sodium dodecylbenzene sulfonate Acid salts, higher alcohol sulfates such as sodium lauryl sulfate, higher phosphate esters such as sodium alkyl phosphate, Anionic emulsifiers such as Rusuruhokohaku salt; and the like; alkyl trimethyl ammonium chloride, dialkyl ammonium chloride, cationic emulsifiers such as ammonium chloride.
  • emulsifiers can be used alone or in combination of two or more.
  • nonionic emulsifiers polyoxyethylene polypropylene glycol, polyethylene glycol monostearate, polyoxyethylene alkyl ether, and polyoxyethylene alkylphenol ether are preferable.
  • nonionic emulsifier those having a weight average molecular weight of less than 10,000 are preferable, those having a weight average molecular weight of 500 to 8000 are more preferable, and those having a weight average molecular weight of 600 to 5000 are more preferable.
  • anionic emulsifiers higher phosphate ester salts and higher alcohol sulfate ester salts are preferred.
  • emulsifiers at least one of a nonionic emulsifier and an anionic emulsifier is preferable, an anionic emulsifier is more preferably included, and a nonionic emulsifier and an anionic emulsifier are more preferably used in combination.
  • a combination of a nonionic emulsifier and an anionic emulsifier coagulation described later can be achieved while effectively suppressing the occurrence of soiling due to adhesion of polymer aggregates to a polymerization apparatus (for example, a polymerization tank) during emulsion polymerization. It is possible to reduce the amount of coagulant used in the process, and as a result, the amount of coagulant in the finally obtained acrylic rubber can be reduced, and the water resistance of the resulting rubber cross-linked product can be further increased. Can be improved.
  • the emulsifying action can be enhanced, so that the amount of the emulsifier itself can also be reduced, and as a result, in the acrylic rubber finally obtained
  • the residual amount of the emulsifier contained in can be reduced, whereby the water resistance of the resulting acrylic rubber can be further increased.
  • the use amount of the emulsifier is preferably 0.1 to 5 parts by weight, more preferably 0.5 to 4 parts by weight, based on the total amount of the emulsifier to be used with respect to 100 parts by weight of the monomer used for the polymerization. More preferably, it is 1 to 3 parts by weight.
  • the amount of the nonionic emulsifier used is more than 0 parts by weight, preferably 0 parts by weight with respect to 100 parts by weight of the monomer used for the polymerization.
  • the weight ratio of the nonionic emulsifier / anionic emulsifier is preferably 1/99 to 99/1, and preferably 10/90 to 80/20. More preferred is 25/75 to 75/25, still more preferred is 50/50 to 75/25, and even more preferred is 65/35 to 75/25.
  • azo compounds such as azobisisobutyronitrile; organic peroxides such as diisopropylbenzene hydroperoxide, cumene hydroperoxide, paramentane hydroperoxide, benzoyl peroxide; sodium persulfate, persulfate Inorganic peroxides such as potassium, hydrogen peroxide, and ammonium persulfate; can be used.
  • organic peroxides such as diisopropylbenzene hydroperoxide, cumene hydroperoxide, paramentane hydroperoxide, benzoyl peroxide
  • sodium persulfate persulfate
  • persulfate Inorganic peroxides such as potassium, hydrogen peroxide, and ammonium persulfate
  • the organic peroxide and the inorganic peroxide as the polymerization initiator as a redox polymerization initiator in combination with a reducing agent.
  • a reducing agent used in combination
  • the compound containing metal ions in a reduced state such as ferrous sulfate, sodium hexamethylenediamine tetraacetate, cuprous naphthenate; ascorbic acid, sodium ascorbate Ascorbic acid (salt) such as potassium ascorbate; Erythorbic acid (salt) such as erythorbic acid, sodium erythorbate, potassium erythorbate; saccharides; Sulphinates such as sodium hydroxymethanesulfinate; Sodium hydrogen hydride, sodium aldehyde sodium hydrogen sulfite, potassium hydrogen sulfite; pyrosulfites such as sodium pyrosulfite, potassium pyrosulfite, sodium hydrogen bisulfit
  • polymerization terminator examples include hydroxylamine, hydroxyamine sulfate, diethylhydroxyamine, hydroxyaminesulfonic acid and its alkali metal salt, sodium dimethyldithiocarbamate, hydroquinone and the like.
  • the amount of the polymerization terminator used is not particularly limited, but is preferably 0.1 to 2 parts by weight with respect to 100 parts by weight of the monomer used for the polymerization.
  • the amount of water used is preferably 80 to 500 parts by weight, more preferably 100 to 300 parts by weight with respect to 100 parts by weight of the monomer used for the polymerization.
  • polymerization auxiliary materials such as a molecular weight adjusting agent, a particle size adjusting agent, a chelating agent, and an oxygen scavenger can be used as necessary.
  • the emulsion polymerization may be carried out by any of batch, semi-batch and continuous methods, but the semi-batch method is preferred. Specifically, in the reaction system containing the polymerization initiator and the reducing agent, the polymerization reaction is performed while continuously dropping the monomer used for the polymerization to the polymerization reaction system from the start of the polymerization reaction to an arbitrary time.
  • the polymerization reaction is preferable to perform the polymerization reaction while continuously dropping into the polymerization reaction system from the start of the polymerization reaction to any time, It is more preferable to perform the polymerization reaction while continuously dropping the monomer, polymerization initiator, and reducing agent used for the polymerization from the start of the polymerization reaction to an arbitrary time while continuously dropping into the polymerization reaction system.
  • the polymerization is usually performed in a temperature range of 0 to 70 ° C., preferably 5 to 50 ° C.
  • the monomer used for polymerization is mixed with an emulsifier and water to form a monomer emulsion, It is preferable to drop continuously in the state of an emulsion.
  • the method for preparing the monomer emulsion is not particularly limited, and includes a method of stirring the total amount of monomers used for polymerization, the total amount of emulsifier, and water using a stirrer such as a homomixer or a disk turbine. Can be mentioned.
  • the amount of water used in the monomer emulsion is preferably 10 to 70 parts by weight, more preferably 20 to 50 parts by weight with respect to 100 parts by weight of the monomer used for the polymerization.
  • the polymerization reaction when the polymerization reaction is carried out while continuously dropping into the polymerization reaction system from the start of the polymerization reaction to an arbitrary time for all of the monomer, polymerization initiator, and reducing agent used for the polymerization, these are separate. Or at least the polymerization initiator and the reducing agent may be mixed in advance and, if necessary, dropped into the polymerization system from the same dropping device as an aqueous solution. May be. After completion of dropping, the reaction may be continued for an arbitrary time in order to further improve the polymerization reaction rate.
  • the ethylene oxide polymer addition step of the production method of the present invention is a step of adding an ethylene oxide polymer to the emulsion polymerization liquid before coagulation.
  • the method for allowing the emulsion polymerization liquid to contain the ethylene oxide polymer is not particularly limited, and the emulsion polymerization liquid before coagulation can be in a state in which the ethylene oxide polymer can be contained. Anything is fine.
  • an ethylene oxide polymer may be added to the emulsion polymerization solution after emulsion polymerization, or a solution before emulsion polymerization, specifically, a solution for emulsion polymerization (for example, to form acrylic rubber)
  • a solution for emulsion polymerization for example, to form acrylic rubber
  • An emulsion polymerization solution containing a polymer may be obtained.
  • an ethylene oxide polymer is added to the emulsion polymerization liquid after emulsion polymerization. It is preferable to use such a mode.
  • the addition form of the ethylene oxide polymer is not particularly limited, but when the ethylene oxide polymer is solid at room temperature, it may be added in a solid state or dissolved in a solvent such as water. You may add in a state.
  • an ethylene oxide polymer is preliminarily contained in an emulsion polymerization solution before coagulation, and coagulation in a coagulation step described later in the presence of such an ethylene oxide polymer.
  • the coagulability of the emulsion polymerization liquid can be improved, and thereby the amount of coagulant in the coagulation step can be reduced.
  • flocculant in the acrylic rubber finally obtained by this can be reduced, and water resistance in the case of setting it as a rubber crosslinked material can be improved more.
  • the residual amount of the coagulant in the acrylic rubber was If the amount is too large, the water resistance of the resulting rubber cross-linked product will decrease, and the amount of coagulant used can be reduced by coagulating at a temperature of 78 ° C. or higher in the presence of an ethylene oxide polymer. It has been found that the residual amount of coagulant in rubber can be reduced.
  • the ethylene oxide polymer may be a polymer having a polyethylene oxide structure as the main chain structure, and is not particularly limited, but is preferably a polymer consisting essentially of a polyethylene oxide structure. Examples thereof include polyethylene oxide, polypropylene oxide, ethylene oxide / propylene oxide copolymer, and among these, polyethylene oxide, that is, ethylene oxide homopolymer is preferable.
  • the weight average molecular weight of the ethylene oxide polymer is preferably 10,000 to 1,000,000, more preferably 10,000 to 200,000, and still more preferably 20,000 to 120,000.
  • the addition amount of the ethylene oxide polymer in the ethylene oxide polymer addition step is preferably 0.005 to 1 part by weight, more preferably 0.006 to 0 with respect to 100 parts by weight of the acrylic rubber component in the emulsion polymerization liquid. .6 parts by weight, more preferably 0.007 to 0.5 parts by weight, still more preferably 0.01 to 0.1 parts by weight, and particularly preferably 0.02 to 0.06 parts by weight.
  • the compounding agents to be blended with the acrylic rubber specifically, anti-aging agent and / or lubricant are coagulated. It is preferable to make it contain beforehand in the emulsion polymerization liquid before performing.
  • an anti-aging agent in the emulsion polymerization liquid before coagulation, deterioration of the acrylic rubber due to heat during drying in the drying step described later can be effectively suppressed. Specifically, it is possible to effectively suppress a decrease in Mooney viscosity due to deterioration due to heating during drying, thereby effectively reducing the normal tensile strength and elongation at break when a rubber cross-linked product is obtained. It can be raised.
  • the anti-aging agent in the state of the emulsion polymerization liquid before coagulation, by blending the anti-aging agent, the anti-aging agent can be appropriately dispersed, so even when the amount of the anti-aging agent is reduced, The effect of addition can be sufficiently exhibited.
  • the blending amount of the antioxidant is preferably 0.1 to 2 parts by weight, more preferably 0.2 to 1.2 parts by weight with respect to 100 parts by weight of the acrylic rubber component in the emulsion polymerization liquid. Even when the amount is relatively small, the effect of the addition can be sufficiently exhibited. Even when the anti-aging agent is contained in the emulsion polymerization solution before coagulation, the added anti-aging agent is not substantially removed in the subsequent coagulation, washing, drying, etc. The effect of the addition can be sufficiently exhibited.
  • a method of containing an anti-aging agent in an emulsion polymerization solution a method of adding to an emulsion polymerization solution after emulsion polymerization and before coagulation, or a method of adding to a solution before emulsion polymerization is performed
  • a method of adding to an emulsion polymerization solution after emulsion polymerization and before coagulation or a method of adding to a solution before emulsion polymerization is performed
  • aggregates may be generated during emulsion polymerization, which may cause contamination of the polymerization apparatus.
  • the method of adding to the emulsion polymerization liquid before coagulating is more preferable.
  • the antiaging agent is not particularly limited, but 2,6-di-t-butyl-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), 4,4'-methylenebis (2,6-di-t-butylfunol), 2,2'-methylene-bis (4-methyl-6-t-butylphenol), 3- (3 Butylation reaction of stearyl 5-di-tert-butyl-4-hydroxyphenyl) propionate, alkylated bisphenol, p-cresol and dicyclopentadiene Phenol-based antioxidants containing no sulfur atom, such as reaction
  • the resulting acrylic rubber can be contained in a state in which the lubricant is well dispersed, and as a result, the resulting acrylic rubber Can be appropriately reduced, thereby preventing adhesion to the dryer during drying, improving operability during drying, and the resulting acrylic rubber, It can be excellent in roll processability.
  • the amount of lubricant added is preferably 0.1 to 0.4 parts by weight, more preferably 0.15 to 0.3 parts by weight, and still more preferably 0 to 100 parts by weight of the acrylic rubber component in the emulsion polymerization liquid. .2 to 0.3 parts by weight.
  • the lubricant is contained in the emulsion polymerization liquid before coagulation, the pre-blended lubricant is not substantially removed in the subsequent coagulation, washing, drying, etc. Even when it is contained, the effect of addition can be sufficiently exhibited.
  • the lubricant is not particularly limited, and examples thereof include phosphate esters, fatty acid esters, fatty acid amides, and higher fatty acids.
  • examples of the method for incorporating the lubricant into the emulsion polymerization liquid include a method of adding to the emulsion polymerization liquid after emulsion polymerization and before coagulation, and a method of adding to the solution before emulsion polymerization. It is done.
  • addition order in the case of adding an antioxidant and / or a lubricant in addition to the ethylene oxide polymer to the emulsion polymerization liquid before coagulation is not particularly limited, and may be appropriately selected.
  • the coagulation step comprises adjusting the emulsion polymerization solution obtained by the emulsion polymerization step to a temperature of 78 ° C. or higher, and adding a coagulant to the emulsion polymerization solution adjusted to a temperature of 78 ° C. or higher. By doing so, it is a process of obtaining a hydrous crumb.
  • an ethylene oxide polymer is previously contained in an emulsion polymerization solution before coagulation, and at a temperature of 78 ° C. or higher in the presence of such an ethylene oxide polymer.
  • the amount of coagulant in the coagulation step of the emulsion polymerization liquid can be reduced, so that the residual amount of the coagulant in the finally obtained acrylic rubber can be reduced.
  • Water resistance can be further increased. If the coagulation temperature is too low, the coagulability of the emulsion polymerization solution will decrease, and the amount of coagulant necessary for coagulation will increase, resulting in the residual amount of coagulant in the acrylic rubber finally obtained.
  • the temperature (coagulation temperature) of the emulsion polymerization liquid during solidification is 78 ° C. or higher, preferably 79 ° C. or higher, more preferably 80 ° C. or higher.
  • the upper limit of the temperature of the emulsion polymerization liquid in coagulation is not particularly limited, but is usually 90 ° C. or lower.
  • the coagulant is not particularly limited, and examples thereof include monovalent to trivalent metal salts.
  • the monovalent to trivalent metal salt is a salt containing a metal that becomes a monovalent to trivalent metal ion when dissolved in water, and is not particularly limited.
  • an inorganic acid selected from hydrochloric acid, nitric acid, sulfuric acid, and the like
  • a salt of an organic acid such as acetic acid or the like with a metal selected from sodium, potassium, lithium, magnesium, calcium, zinc, titanium, manganese, iron, cobalt, nickel, aluminum, tin and the like.
  • hydroxides of these metals can also be used.
  • monovalent to trivalent metal salts include sodium chloride, potassium chloride, lithium chloride, magnesium chloride, calcium chloride, zinc chloride, titanium chloride, manganese chloride, iron chloride, cobalt chloride, nickel chloride, aluminum chloride, and chloride.
  • Metal chlorides such as tin; nitrates such as sodium nitrate, potassium nitrate, lithium nitrate, magnesium nitrate, calcium nitrate, zinc nitrate, titanium nitrate, manganese nitrate, iron nitrate, cobalt nitrate, nickel nitrate, aluminum nitrate, tin nitrate; sodium sulfate And sulfates such as potassium sulfate, lithium sulfate, magnesium sulfate, calcium sulfate, zinc sulfate, titanium sulfate, manganese sulfate, iron sulfate, cobalt sulfate, nickel sulfate, aluminum sulfate and tin sulfate; Among these, calcium chloride, sodium chloride, aluminum sulfate, magnesium chloride, magnesium sulfate, zinc chloride, zinc sulfate, and sodium sulfate are prefer
  • monovalent or divalent metal salts are preferable, calcium chloride, sodium chloride, magnesium sulfate, and sodium sulfate are more preferable, and magnesium sulfate and sodium sulfate are more preferable. Moreover, these can be used individually by 1 type or in combination of multiple types.
  • the use amount of the coagulant can reduce the residual amount of the coagulant in the acrylic rubber finally obtained while making the coagulation of the acrylic rubber sufficient, and in this way, when the rubber cross-linked product is obtained.
  • it is preferably 1 to 100 parts by weight, more preferably 2 to 40 parts by weight, still more preferably 3 to 20 parts by weight, with respect to 100 parts by weight of the acrylic rubber component in the emulsion polymerization liquid. Particularly preferred is 3 to 12 parts by weight.
  • ⁇ Washing process> In the manufacturing method of this invention, it is preferable to further provide the washing
  • the washing method is not particularly limited, and examples thereof include a method of washing with water by using water as a washing liquid and mixing the added water together with the hydrated crumb.
  • the temperature at the time of washing with water is not particularly limited, but is preferably 5 to 60 ° C., more preferably 10 to 50 ° C., and the mixing time is 1 to 60 minutes, more preferably 2 to 30 minutes.
  • the amount of water to be added to the hydrated crumb at the time of washing with water is not particularly limited, but from the viewpoint that the residual amount of coagulant in the finally obtained acrylic rubber can be effectively reduced,
  • the amount of water per washing is preferably 50 to 9,800 parts by weight, more preferably 300 to 1,800 parts per 100 parts by weight of the solid content (mainly acrylic rubber component) contained in the hydrous crumb. Parts by weight.
  • the number of times of washing with water is not particularly limited, and may be one, but is preferably 2 to 10 times, more preferably 3 to 8 from the viewpoint of reducing the residual amount of coagulant in the finally obtained acrylic rubber. Times.
  • the number of washings is in the above range because the influence of the decrease in productivity is increased by increasing the number of steps.
  • acid washing using an acid as a washing solution may be further carried out.
  • the compression set resistance in the case of a rubber cross-linked product can be further improved.
  • the acrylic rubber is a carboxyl group-containing acrylic rubber having a carboxyl group, this acid cleaning
  • the effect of improving the compression set resistance is particularly great.
  • the acid used for the acid cleaning is not particularly limited, and sulfuric acid, hydrochloric acid, phosphoric acid and the like can be used without limitation.
  • the acid washing method is not particularly limited, and examples thereof include a method of mixing an aqueous solution of the added acid together with water-containing crumb.
  • the temperature during the acid cleaning is not particularly limited, but is preferably 5 to 60 ° C., more preferably 10 to 50 ° C., and the mixing time is 1 to 60 minutes, more preferably 2 to 30 minutes.
  • the pH of the acid-washed wash water can be determined, for example, by measuring the pH of the water contained in the hydrous crumb after the acid wash.
  • the water washing conditions may be the same as those described above.
  • the water-containing crumb may be filtered using a sieve such as a rotary screen or a vibrating screen; a centrifugal dehydrator;
  • the drying temperature in the drying step is not particularly limited and varies depending on the dryer used for drying.
  • the drying temperature is preferably 80 to 200 ° C., 100 More preferably, the temperature is set to ⁇ 170 ° C.
  • acrylic rubber can be obtained as described above.
  • the Mooney viscosity (ML1 + 4, 100 ° C.) (polymer Mooney) of the acrylic rubber thus produced is preferably 10 to 80, more preferably 20 to 70, and further preferably 25 to 60.
  • the residual amount of coagulant contained in the acrylic rubber is preferably 9,000 ppm by weight or less, more preferably 7,000 ppm by weight or less, Preferably it is 5,000 ppm by weight or less, particularly preferably 3,500 ppm or less.
  • the lower limit of the residual amount of the coagulant is not particularly limited, but is preferably 10 ppm by weight or more.
  • the method of setting the residual amount of the coagulant as described above is not particularly limited. In addition to the method of coagulation in the coagulation step at a temperature of 78 ° C. or higher in the presence of an ethylene oxide polymer, coagulation is performed. Examples thereof include a method of setting the addition amount of the agent in the above-described range, and a method of adjusting the washing conditions as described above.
  • the residual amount of the emulsifier contained in the acrylic rubber is preferably 22,000 ppm by weight or less, more preferably 20,000 ppm by weight or less, and even more preferably 18,000 ppm by weight. Hereinafter, it is particularly preferably 17,000 ppm by weight or less.
  • the minimum of the residual amount of an emulsifier is not specifically limited, Preferably it is 10 weight ppm or more, More preferably, it is 200 weight ppm or more, More preferably, it is 500 weight ppm or more.
  • the residual amount of an emulsifier can be calculated
  • the method of setting the residual amount of the emulsifier as described above is not particularly limited.
  • a nonionic emulsifier and an anionic emulsifier are used in combination as the emulsifier, and the addition amount thereof is described above. The method of making it into the range which was carried out is mentioned.
  • the acrylic rubber composition of the present invention is obtained by blending a crosslinking agent with the acrylic rubber obtained by the above-described production method of the present invention.
  • crosslinking agent polyvalent amine compounds, such as a diamine compound, and its carbonate; Sulfur; Sulfur donor; Triazine thiol compound; Multivalent epoxy compound; Organic carboxylic acid ammonium salt;
  • crosslinking agents such as oxides, dithiocarbamic acid metal salts, polyvalent carboxylic acids, quaternary onium salts, imidazole compounds, isocyanuric acid compounds, and organic peroxides can be used.
  • crosslinking agents can be used alone or in combination of two or more.
  • the crosslinking agent is preferably selected as appropriate according to the type of the crosslinkable monomer unit.
  • the acrylic rubber produced by the production method of the present invention has an ⁇ , ⁇ -ethylenically unsaturated carboxylic acid monomer unit as a crosslinkable monomer unit, as a crosslinking agent, It is preferable to use a polyvalent amine compound and a carbonate thereof.
  • the polyvalent amine compound and carbonate thereof are not particularly limited, but polyvalent amine compounds having 4 to 30 carbon atoms and carbonates thereof are preferred. Examples of such polyvalent amine compounds and carbonates thereof include aliphatic polyvalent amine compounds, carbonates thereof, and aromatic polyvalent amine compounds.
  • the aliphatic polyvalent amine compound and the carbonate thereof are not particularly limited, and examples thereof include hexamethylene diamine, hexamethylene diamine carbamate, and N, N′-dicinnamylidene-1,6-hexane diamine. Among these, hexamethylenediamine carbamate is preferable.
  • the aromatic polyvalent amine compound is not particularly limited.
  • the content of the crosslinking agent in the acrylic rubber composition of the present invention is preferably 0.05 to 10 parts by weight, more preferably 0.1 to 5 parts by weight, and particularly preferably 0.1 parts by weight with respect to 100 parts by weight of the acrylic rubber. 2 to 4 parts by weight.
  • the acrylic rubber composition of the present invention preferably further contains a crosslinking accelerator.
  • the crosslinking accelerator is not particularly limited, but the acrylic rubber produced by the production method of the present invention has a carboxyl group as a crosslinkable group, and the crosslinking agent is a polyvalent amine compound or carbonic acid thereof.
  • the crosslinking agent is a polyvalent amine compound or carbonic acid thereof.
  • a salt guanidine compound, diazabicycloalkene compound, imidazole compound, quaternary onium salt, tertiary phosphine compound, aliphatic monovalent secondary amine compound, aliphatic monovalent tertiary amine compound, etc. Can be used.
  • guanidine compounds diazabicycloalkene compounds, and aliphatic monovalent secondary amine compounds are preferable, and guanidine compounds are particularly preferable.
  • These basic crosslinking accelerators can be used singly or in combination of two or more.
  • guanidine compound examples include 1,3-di-o-tolylguanidine, 1,3-diphenylguanidine and the like.
  • diazabicycloalkene compound examples include 1,8-diazabicyclo [5.4.0] unde-7-cene, 1,5-diazabicyclo [4.3.0] no-5-ene and the like.
  • imidazole compound examples include 2-methylimidazole and 2-phenylimidazole.
  • quaternary onium salt include tetra n-butylammonium bromide and octadecyltri n-butylammonium bromide.
  • tertiary phosphine compound include triphenylphosphine and tri-p-tolylphosphine.
  • An aliphatic monovalent secondary amine compound is a compound in which two hydrogen atoms of ammonia are substituted with an aliphatic hydrocarbon group.
  • the aliphatic hydrocarbon group substituted for the hydrogen atom is preferably one having 1 to 30 carbon atoms.
  • aliphatic monovalent secondary amine compound examples include dimethylamine, diethylamine, dipropylamine, diallylamine, diisopropylamine, di-n-butylamine, di-t-butylamine, di-sec-butylamine, dihexylamine, di Examples include heptylamine, dioctylamine, dinonylamine, didecylamine, diundecylamine, didodecylamine, ditridecylamine, ditetradecylamine, dipentadecylamine, dicetylamine, di-2-ethylhexylamine, and dioctadecylamine.
  • An aliphatic monovalent tertiary amine compound is a compound in which all three hydrogen atoms of ammonia are substituted with an aliphatic hydrocarbon group.
  • the aliphatic hydrocarbon group substituted for the hydrogen atom is preferably one having 1 to 30 carbon atoms.
  • Specific examples of the aliphatic monovalent tertiary amine compound include trimethylamine, triethylamine, tripropylamine, triallylamine, triisopropylamine, tri-n-butylamine, tri-t-butylamine, tri-sec-butylamine, trihexylamine. , Triheptylamine, trioctylamine, trinonylamine, tridecylamine, triundecylamine, and tridodecylamine.
  • the content of the crosslinking accelerator in the acrylic rubber composition of the present invention is preferably 0.1 to 10 parts by weight, more preferably 0.5 to 7.5 parts by weight with respect to 100 parts by weight of the acrylic rubber. Parts, particularly preferably 1 to 5 parts by weight.
  • the acrylic rubber composition of the present invention can contain a compounding agent usually used in the field of rubber processing, in addition to the above components.
  • compounding agents include reinforcing fillers such as silica and carbon black; non-reinforcing fillers such as calcium carbonate and clay; anti-aging agents; light stabilizers; scorch inhibitors; plasticizers; Adhesives; Adhesives; Lubricants; Lubricants; Flame retardants; Antifungal agents; Antistatic agents; Colorants;
  • the compounding amount of these compounding agents is not particularly limited as long as it does not impair the object and effect of the present invention, and an amount corresponding to the compounding purpose can be appropriately compounded.
  • rubbers, elastomers, resins and the like other than the acrylic rubber of the present invention described above may be further blended within a range not impairing the effects of the present invention.
  • rubber other than acrylic rubber such as acrylic rubber other than the acrylic rubber of the present invention, natural rubber, polybutadiene rubber, polyisoprene rubber, styrene-butadiene rubber, acrylonitrile-butadiene rubber, silicon rubber, fluorine rubber, etc .
  • Elastomers such as elastomers, styrene elastomers, vinyl chloride elastomers, polyester elastomers, polyamide elastomers, polyurethane elastomers, polysiloxane elastomers
  • the total blending amount of the rubber, elastomer, and resin other than the acrylic rubber of the present invention described above is preferably 50 parts by weight or less, more preferably 10 parts by weight or less, further preferably 100 parts by weight of acrylic rubber. 1 part by weight or less.
  • the acrylic rubber is blended with a crosslinking agent and other various compounding agents used as necessary, mixed and kneaded with a Banbury mixer or a kneader, and then using a kneading roll. Further, it is prepared by kneading.
  • the blending order of each component is not particularly limited, but after sufficiently mixing components that are difficult to react and decompose with heat, a crosslinking agent that is a component that easily reacts and decomposes with heat at a temperature at which reaction and decomposition do not occur. It is preferable to mix in a short time.
  • the rubber cross-linked product of the present invention is obtained by cross-linking the acrylic rubber composition of the present invention described above.
  • the rubber cross-linked product of the present invention uses the acrylic rubber composition of the present invention, is molded by a molding machine corresponding to a desired shape, for example, an extruder, an injection molding machine, a compressor, and a roll, and is heated. It can be produced by carrying out a cross-linking reaction and fixing the shape as a rubber cross-linked product. In this case, crosslinking may be performed after molding in advance, or crosslinking may be performed simultaneously with molding.
  • the molding temperature is usually 10 to 200 ° C, preferably 25 to 120 ° C.
  • the crosslinking temperature is usually 130 to 220 ° C., preferably 150 to 190 ° C.
  • the crosslinking time is usually 2 minutes to 10 hours, preferably 3 minutes to 5 hours.
  • a heating method a method used for crosslinking of rubber, such as press heating, steam heating, oven heating, and hot air heating, may be appropriately selected.
  • the rubber cross-linked product of the present invention may be further heated to perform secondary crosslinking.
  • the secondary crosslinking varies depending on the heating method, crosslinking temperature, shape, etc., but is preferably performed for 1 to 48 hours. What is necessary is just to select a heating method and heating temperature suitably.
  • the rubber cross-linked product of the present invention obtained in this way is obtained by using the acrylic rubber obtained by the production method of the present invention described above, it has excellent water resistance. Therefore, the rubber cross-linked product of the present invention makes use of such characteristics, for example, seals such as O-rings, packings, oil seals, bearing seals and the like in a wide range of transportation machines such as automobiles, general equipment, and electrical equipment.
  • seals such as O-rings, packings, oil seals, bearing seals and the like in a wide range of transportation machines such as automobiles, general equipment, and electrical equipment.
  • Materials gaskets; cushioning materials, vibration-proof materials; electric wire covering materials; industrial belts; tubes and hoses; sheets;
  • Mooney viscosity (ML1 + 4, 100 ° C.) The Mooney viscosity (polymer Mooney) of the acrylic rubber was measured according to JIS K6300.
  • the residual amount of coagulant in the acrylic rubber was measured by performing elemental analysis on the acrylic rubber using (ICP-AES). Specifically, the content ratio of the element contained in the used coagulant was determined by elemental analysis, and the residual amount of the coagulant was calculated from the determined content ratio.
  • the acrylic rubber composition was placed in a mold having a length of 15 cm, a width of 15 cm, and a depth of 0.2 cm, and was subjected to primary crosslinking by pressing at 170 ° C. for 20 minutes while being pressed at a press pressure of 10 MPa.
  • the product was further subjected to secondary crosslinking by heating at 170 ° C. for 4 hours in a gear-type oven to obtain a sheet-like rubber crosslinked product.
  • the obtained rubber cross-linked product was punched with a No. 3 type dumbbell to prepare a test piece. Next, using this test piece, tensile strength and elongation were measured according to JIS K6251.
  • the acrylic rubber composition was placed in a mold having a length of 15 cm, a width of 15 cm, and a depth of 0.2 cm, and was subjected to primary crosslinking by pressing at 170 ° C. for 20 minutes while being pressed at a press pressure of 10 MPa.
  • the product was further subjected to secondary crosslinking by heating at 170 ° C. for 4 hours in a gear-type oven to obtain a sheet-like rubber crosslinked product.
  • volume change rate before and after immersion (Volume of specimen after immersion ⁇ Volume of specimen before immersion) ⁇ Volume of specimen before immersion ⁇ 100
  • reaction was continued for 1 hour while maintaining the temperature in the polymerization reaction vessel at 23 ° C., and it was confirmed that the polymerization conversion rate reached 95%, and polymerization was carried out by adding hydroquinone as a polymerization terminator. The reaction was stopped to obtain an emulsion polymerization solution.
  • Mw weight average molecular weight
  • 0.011 parts based on 100 parts of the total amount of monomers used in the preparation of the emulsion polymerization liquid (that is, the total of ethyl acrylate, n-butyl acrylate, and mono n-butyl fumarate).
  • stearyl propionate 3- (3,5-di-tert-butyl-4-hydroxyphenyl) as an anti-aging agent (trade name “Irganox 1076”, manufactured by BASF) 0.3 parts (emulsion polymerization solution) And 1 part for a total of 100 parts of the monomers used in the production of polyoxyethylene stearyl ether phosphoric acid as a lubricant Product name “Phosphanol RL-210”, weight average molecular weight: about 500, manufactured by Toho Chemical Co., Ltd.) 0.075 parts (for a total of 100 parts of the charged monomers used to produce the emulsion polymerization liquid) 0.25 parts) was mixed to obtain a mixed solution.
  • the obtained mixed liquid was transferred to a coagulation tank.
  • 60 parts of industrial water was added and the temperature was raised to 80 ° C., and then the mixed liquid was stirred at a temperature of 80 ° C.
  • 3.3 parts of sodium sulfate as a coagulant 11 parts with respect to 100 parts of the polymer contained in the mixed solution was continuously added to solidify the polymer, and then filtered to remove acrylic.
  • a water-containing crumb of rubber (A1) was obtained.
  • a sulfuric acid aqueous solution obtained by mixing 388 parts of industrial water and 0.13 part of concentrated sulfuric acid is added to 100 parts of the solid content of the hydrated crumb which has been washed with water in the above, and in the coagulation tank. After stirring for 5 minutes at room temperature, the water-containing crumb was pickled by draining water from the coagulation tank. The pH of the hydrated crumb after pickling (pH of water in the hydrated crumb) was measured, and the pH was 3.
  • the resulting acrylic rubber (A1) had a Mooney viscosity (ML1 + 4, 100 ° C.) of 33, and the composition of the acrylic rubber (A1) was 49.3% by weight of ethyl acrylate units and 49.3% of n-butyl acrylate units. % By weight and mono-n-butyl fumarate units of 1.4% by weight. Moreover, about the acrylic rubber (A1), the residual amount of the coagulant
  • the water-containing crumb of the obtained acrylic rubber (A2) is subjected to four times of water washing, pickling, pure water washing and drying with a hot air dryer in the same manner as in Production Example 1, so that solid acrylic rubber is obtained.
  • (A2) was obtained.
  • the resulting acrylic rubber (A2) had a Mooney viscosity (ML1 + 4, 100 ° C.) of 33, and the composition of the acrylic rubber (A2) was 49.3% by weight of ethyl acrylate units and 49.3% of n-butyl acrylate units. % By weight and mono-n-butyl fumarate units of 1.4% by weight.
  • the residual amount of the coagulant in the acrylic rubber (A2) was measured according to the above method. The results are shown in Table 1.
  • the water-containing crumb of the obtained acrylic rubber (A3) is subjected to four times of water washing, pickling, pure water washing and drying with a hot air dryer in the same manner as in Production Example 1 to obtain a solid acrylic rubber.
  • (A3) was obtained.
  • the resulting acrylic rubber (A3) has a Mooney viscosity (ML1 + 4, 100 ° C.) of 33.
  • the acrylic rubber (A3) has a composition of 49.3% by weight of ethyl acrylate units and 49.3% of n-butyl acrylate units. % By weight and mono-n-butyl fumarate units of 1.4% by weight.
  • the residual amount of the coagulant in the acrylic rubber (A3) was measured according to the above method. The results are shown in Table 1.
  • reaction was continued for 1 hour while maintaining the temperature in the polymerization reaction vessel at 23 ° C., and it was confirmed that the polymerization conversion rate reached 95%, and polymerization was carried out by adding hydroquinone as a polymerization terminator. The reaction was stopped to obtain an emulsion polymerization solution.
  • stearyl 3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate (trade name “Irganox 1076”, BASF) as an anti-aging agent.
  • the water-containing crumb of the obtained acrylic rubber (A4) was subjected to four times of water washing, pickling, pure water washing and drying with a hot air dryer in the same manner as in Production Example 1 to obtain a solid acrylic rubber. (A4) was obtained.
  • the resulting acrylic rubber (A4) has a Mooney viscosity (ML1 + 4, 100 ° C.) of 33.
  • the acrylic rubber (A4) has a composition of 49.3% by weight of ethyl acrylate units and 49.3% of n-butyl acrylate units. % By weight and mono-n-butyl fumarate units of 1.4% by weight.
  • the residual amount of the coagulant in the acrylic rubber (A4) was measured according to the above method. The results are shown in Table 1.
  • the water-containing crumb of the obtained acrylic rubber (A5) was subjected to four times of water washing, pickling, pure water washing and drying with a hot air dryer in the same manner as in Production Example 1, thereby solid acrylic rubber. (A5) was obtained.
  • the resulting acrylic rubber (A5) has a Mooney viscosity (ML1 + 4, 100 ° C.) of 33.
  • the acrylic rubber (A5) has a composition of 49.3% by weight of ethyl acrylate units and 49.3% of n-butyl acrylate units. % By weight and mono-n-butyl fumarate units of 1.4% by weight.
  • the residual amount of the coagulant in the acrylic rubber (A5) was measured according to the above method. The results are shown in Table 1.
  • the water-containing crumb of the obtained acrylic rubber (A6) was subjected to four times of water washing, pickling, pure water washing, and drying with a hot air dryer in the same manner as in Production Example 1 to obtain a solid acrylic rubber.
  • (A6) was obtained.
  • the resulting acrylic rubber (A6) had a Mooney viscosity (ML1 + 4, 100 ° C.) of 33.
  • the acrylic rubber (A6) had a composition of 49.3% by weight of ethyl acrylate units and 49.3% of n-butyl acrylate units. % By weight and mono-n-butyl fumarate units of 1.4% by weight.
  • the residual amount of the coagulant in the acrylic rubber (A6) was measured according to the above method. The results are shown in Table 1.
  • the water-containing crumb of the obtained acrylic rubber (A7) was subjected to four times of water washing, pickling, pure water washing and drying with a hot air dryer in the same manner as in Production Example 1 to obtain a solid acrylic rubber. (A7) was obtained.
  • the resulting acrylic rubber (A7) has a Mooney viscosity (ML1 + 4, 100 ° C.) of 33.
  • the acrylic rubber (A7) has a composition of 49.3% by weight of ethyl acrylate units and 49.3% of n-butyl acrylate units. % By weight and mono-n-butyl fumarate units of 1.4% by weight.
  • the residual amount of the coagulant in the acrylic rubber (A7) was measured according to the above method. The results are shown in Table 1.
  • the water-containing crumb of the obtained acrylic rubber (A8) was subjected to four times of water washing, pickling, pure water washing and drying with a hot air dryer in the same manner as in Production Example 1 to obtain a solid acrylic rubber. (A8) was obtained.
  • the resulting acrylic rubber (A8) had a Mooney viscosity (ML1 + 4, 100 ° C.) of 34, and the composition of the acrylic rubber (A8) was 49.3% by weight of ethyl acrylate units and 49.3% of n-butyl acrylate units. % By weight and mono-n-butyl fumarate units of 1.4% by weight.
  • the residual amount of the coagulant in the acrylic rubber (A8) was measured according to the above method. The results are shown in Table 1.
  • Example 1 Using a Banbury mixer, 100 parts of the acrylic rubber (A1) obtained in Production Example 1, 30 parts of clay (trade name “Satinton Clay 5A”, manufactured by Takehara Chemical Industry Co., Ltd., calcined kaolin), silica (trade name “ Carplex 1120 “, manufactured by Evonik) 15 parts, silica (trade name” Carplex 67 “, manufactured by Evonik) 35 parts, stearic acid 2 parts, 4,4'-bis ( ⁇ , ⁇ -dimethylbenzyl) diphenylamine ( 2 parts of the product name “NOCRACK CD” (Ouchi Shinsei Chemical Co., Ltd.) and 1 part of 3-methacryloxypropyltrimethoxysilane (trade name “KBM-503”, Shin-Etsu Silicone Co., Ltd., silane coupling agent) Add and mix at 50 ° C.
  • clay trade name “Satinton Clay 5A”, manufactured by Takehara Chemical Industry Co., Ltd., calcined kaolin
  • Examples 2 to 4 In the same manner as in Example 1 except that the acrylic rubbers (A2) to (A4) obtained in Production Examples 2 to 4 were used in place of the acrylic rubber (A1) obtained in Production Example 1, respectively.
  • Table 2 shows the results of measurement and evaluation in the same manner after obtaining the rubber composition.
  • the addition amount of the compounding agent for preparing the monomer emulsion is shown by the compounding amount with respect to 100 parts of the charged monomer.
  • the addition amount of the compounding agent added to the emulsion polymerization solution before coagulation was shown as the compounding amount with respect to 100 parts of the emulsion polymerization solution.
  • the addition amount of the coagulant used in the coagulation step is shown as a blending amount with respect to 100 parts of the liquid mixture obtained by adding an antioxidant, polyethylene oxide and / or lubricant to the emulsion polymerization liquid. .
  • Production Examples 1 to 3 were carried out by adding an ethylene oxide polymer to the emulsion polymerization solution before coagulation, and coagulating at a temperature of 78 ° C. or higher in the presence of the ethylene oxide polymer.
  • the crosslinked rubber obtained using the acrylic rubber obtained by No. 4 was excellent in water resistance (Production Examples 1 to 4, Examples 1 to 4).

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Abstract

L'invention fournit un procédé de fabrication de caoutchouc acrylique qui est destiné à fabriquer un caoutchouc acrylique, et qui comporte : une étape de polymérisation en émulsion au cours de laquelle est obtenu un liquide de polymérisation en émulsion par polymérisation en émulsion d'un monomère destiné à former ledit caoutchouc acrylique ; une étape de d'ajout de polymère à base d'oxyde d'éthylène au cours de laquelle un polymère à base d'oxyde d'éthylène est incorporé audit liquide de polymérisation en émulsion avant solidification ; et une étape de solidification au cours de laquelle sont obtenues des granules hydratées par solidification en ajoutant un agent de solidification audit liquide de polymérisation en émulsion ajusté à une température supérieure ou égale à 78°C. Enfin, l'invention permet de fournir un procédé de fabrication de caoutchouc acrylique qui permet d'obtenir un produit réticulé de caoutchouc d'une excellente résistance à l'eau.
PCT/JP2017/039180 2016-10-31 2017-10-30 Procédé de fabrication de caoutchouc acrylique WO2018079786A1 (fr)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019208813A1 (fr) * 2018-04-27 2019-10-31 日本ゼオン株式会社 Production de caoutchouc acrylique et caoutchouc acrylique obtenu
WO2020203301A1 (fr) * 2019-03-29 2020-10-08 株式会社大阪ソーダ Procédé de production de caoutchouc acrylique
CN112703625A (zh) * 2018-09-28 2021-04-23 日本瑞翁株式会社 全固体二次电池用粘结剂组合物、全固体二次电池用浆料组合物、含固体电解质层及全固体二次电池
CN112703626A (zh) * 2018-09-28 2021-04-23 日本瑞翁株式会社 全固体二次电池用粘结剂组合物、全固体二次电池用浆料组合物、含固体电解质层及全固体二次电池
WO2021200933A1 (fr) * 2020-03-31 2021-10-07 株式会社大阪ソーダ Copolymère acrylique, composition contenant un copolymère acrylique et produit réticulé de celui-ci
EP4001323A4 (fr) * 2019-07-19 2023-08-23 Zeon Corporation Feuille de caoutchouc acrylique excellente en termes de stabilite au stockage et d'aptitude au formage
EP4000839A4 (fr) * 2019-07-19 2023-08-30 Zeon Corporation Voile de caoutchouc acrylique excellent en termes de stabilité de conservation et d'usinabilité
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EP4029883A4 (fr) * 2019-09-12 2023-10-11 Osaka Soda Co., Ltd. Procédé de production de caoutchouc acrylique
WO2021200933A1 (fr) * 2020-03-31 2021-10-07 株式会社大阪ソーダ Copolymère acrylique, composition contenant un copolymère acrylique et produit réticulé de celui-ci

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