WO2024014452A1 - ゴム補強用繊維処理剤、ゴム補強用繊維処理剤キット、ゴム補強用繊維の製造方法、ゴム補強用繊維及びゴム製品 - Google Patents
ゴム補強用繊維処理剤、ゴム補強用繊維処理剤キット、ゴム補強用繊維の製造方法、ゴム補強用繊維及びゴム製品 Download PDFInfo
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- WO2024014452A1 WO2024014452A1 PCT/JP2023/025560 JP2023025560W WO2024014452A1 WO 2024014452 A1 WO2024014452 A1 WO 2024014452A1 JP 2023025560 W JP2023025560 W JP 2023025560W WO 2024014452 A1 WO2024014452 A1 WO 2024014452A1
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
- D06M15/21—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D06M15/263—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of unsaturated carboxylic acids; Salts or esters thereof
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/62—Polymers of compounds having carbon-to-carbon double bonds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/80—Masked polyisocyanates
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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
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
-
- 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
- C09J121/00—Adhesives based on unspecified rubbers
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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
- C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
- C09J175/04—Polyurethanes
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M13/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment
- D06M13/10—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment with compounds containing oxygen
- D06M13/11—Compounds containing epoxy groups or precursors thereof
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M13/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment
- D06M13/322—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment with compounds containing nitrogen
- D06M13/395—Isocyanates
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
- D06M15/21—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D06M15/227—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of hydrocarbons, or reaction products thereof, e.g. afterhalogenated or sulfochlorinated
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
- D06M15/37—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D06M15/55—Epoxy resins
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/693—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with natural or synthetic rubber, or derivatives thereof
Definitions
- the present invention relates to a rubber reinforcing fiber treating agent that does not contain resorcinol and formaldehyde, a rubber reinforcing fiber treating agent kit that does not contain resorcinol and formaldehyde, a method for producing rubber reinforcing fibers using the same, and a rubber reinforcing fiber treating agent that does not contain resorcinol and formaldehyde.
- a rubber reinforcing fiber treating agent that does not contain resorcinol and formaldehyde
- an adhesive composition containing a resorcinol-formaldehyde initial condensate and rubber latex is attached to fibers before being attached to the fibers.
- An adhesive composition comprising an organic polyisocyanate, an aqueous urethane compound, a thermoplastic polymer having a crosslinkable functional group, and an epoxide compound is disclosed.
- Patent Documents 3 to 6 disclose dipping compositions containing an acrylic polymer, an epoxy compound, a blocked isocyanate compound, and rubber latex as attempts that do not use resorcin and formaldehyde, including not using a resorcin-formaldehyde initial condensate. is disclosed.
- rubber reinforcing fibers were attached with an adhesive composition containing resorcin, a resorcin/formaldehyde initial condensate obtained by condensing resorcin and formaldehyde, formaldehyde, and rubber latex.
- an object of the present invention is to provide a rubber reinforcing fiber processing agent and a rubber reinforcing fiber processing agent kit that do not contain resorcinol and formaldehyde, and rubber reinforcing fibers and rubber products that have excellent adhesiveness with rubber compositions. shall be.
- the above-mentioned problem is a rubber reinforcing fiber treatment agent that does not contain resorcinol or formaldehyde, and which contains a polycarboxylic acid polymer, an epoxy compound, a rubber latex having a structure derived from vinylpyridine in the polymer molecule, and a blocked isocyanate.
- This problem can be solved by a rubber reinforcing fiber treatment agent containing a compound.
- the rubber reinforcing fiber treatment agent further contains a polymer compound having an oxazoline group.
- the polycarboxylic acid polymer contained in the rubber reinforcing fiber treatment agent preferably has a crosslinked structure and is included in the polycarboxylic acid polymer particles, or is preferably a polymer that does not have a crosslinked structure.
- the polycarboxylic acid polymer particles are preferably fine particles having a volume average particle diameter of 10 nm to 10 ⁇ m.
- the above-mentioned problem is a kit for a fiber treatment agent for rubber reinforcement that does not contain resorcinol and formaldehyde, which includes treatment agent 1 containing an epoxy compound and a blocked isocyanate compound, and a polymer molecule derived from vinylpyridine.
- the problem can also be solved by a fiber treatment agent kit for rubber reinforcement, which includes a treatment agent 2 containing a rubber latex having a structure, a polycarboxylic acid polymer, and a polymer compound having an oxazoline group.
- the rubber reinforcing fiber treatment agent kit also includes a step of applying a processing liquid containing the treatment agent 1 to the fibers, and then applying a treatment liquid containing the treatment agent 2 to the fibers.
- the polycarboxylic acid polymer contained in the treatment agent 2 is preferably one that has a crosslinked structure and is included in the polycarboxylic acid polymer particles, or a polymer that does not have a crosslinked structure.
- the polycarboxylic acid polymer particles are preferably fine particles having a volume average particle diameter of 10 nm to 10 ⁇ m.
- the above problem is solved by heat treating a composition containing a polycarboxylic acid polymer, an epoxy compound, a rubber latex having a structure derived from vinylpyridine in the polymer molecule, and a blocked isocyanate compound on the fiber surface.
- the problem can also be solved by rubber reinforcing fibers to which an adhesive composition obtained by applying an adhesive composition is attached.
- the problem can also be solved by using rubber reinforcing fibers to which an adhesive composition obtained by heat-treating objects is attached.
- the problem can also be solved by a rubber product containing the above rubber reinforcing fiber.
- the polycarboxylic acid polymer preferably has a crosslinked structure and is included in the polycarboxylic acid polymer particles, or is preferably a polymer that does not have a crosslinked structure.
- the polycarboxylic acid polymer particles are preferably fine particles having a volume average particle diameter of 10 nm to 10 ⁇ m.
- the fibers include polyester, nylon, or aramid.
- a rubber reinforcing fiber processing agent and a rubber reinforcing fiber processing agent kit that do not contain resorcinol and formaldehyde, and rubber reinforcing fibers and rubber products that have excellent adhesion to a rubber composition.
- the rubber reinforcing fiber treatment agent of the present invention (hereinafter also referred to as "the treatment agent of the present invention") comprises a polycarboxylic acid polymer, an epoxy compound, and a rubber having a structure derived from vinylpyridine in the polymer molecule. Contains latex and blocked isocyanate compounds, and is free of resorcinol and formaldehyde. It is preferable that the treatment agent of the present invention further contains a polymer compound having an oxazoline group.
- the polycarboxylic acid polymer contained in the treatment agent of the present invention preferably has a crosslinked structure and is included in the polycarboxylic acid polymer particles, or is preferably a polymer that does not have a crosslinked structure.
- the polycarboxylic acid polymer particles are preferably fine particles having a volume average particle diameter of 10 nm to 10 ⁇ m.
- the processing agent of the present invention further contains a liquid medium. Further, it is preferably in a liquid state. Rubber reinforcing fibers can be obtained by adhesion treatment of fiber surfaces using the treatment agent of the present invention.
- processing agent kit of the present invention when the processing agent of the present invention further contains a polymer compound having an oxazoline group, a processing agent kit containing two types of processing agents can be prepared.
- the fiber treatment agent kit for rubber reinforcement of the present invention (hereinafter also referred to as “treatment agent kit of the present invention") comprises a treatment agent 1 containing an epoxy compound and a blocked isocyanate compound, and vinylpyridine in the polymer molecule.
- the treatment agent 2 contains a rubber latex having a structure derived from , a polycarboxylic acid polymer, and a polymer compound having an oxazoline group, and does not contain resorcinol or formaldehyde.
- the polycarboxylic acid polymer contained in the treatment agent 2 preferably has a crosslinked structure and is included in the polycarboxylic acid polymer particles, or is preferably a polymer that does not have a crosslinked structure.
- the polycarboxylic acid polymer particles are preferably fine particles having a volume average particle diameter of 10 nm to 10 ⁇ m. It is preferable that processing agents 1 and 2 each further contain a liquid medium.
- the rubber reinforcing fiber treating agent and the rubber reinforcing fiber treating agent kit of the present invention do not contain resorcin and formaldehyde.
- "free of resorcin and formaldehyde” means not only substantially free of resorcin and/or formaldehyde, but also substantially free of resorcin/formaldehyde initial condensate, which is a condensation of resorcin and formaldehyde. It means no.
- “Substantially free of” these compounds means that the content of each compound is less than 0.1% by mass. The content is preferably less than 0.01% by weight, most preferably 0% by weight (undetectable).
- a processing agent and a processing agent kit that substantially do not contain resorcin, formaldehyde, or a resorcin/formaldehyde initial condensate obtained by condensing resorcin and formaldehyde, or It can be manufactured by using raw materials that are not generated during the manufacturing process.
- the liquid medium is preferably an aqueous medium.
- the aqueous medium is a liquid medium containing 50% by mass or more of water, and it is preferable to use water that has been purified by removing impurities, but as long as the effects of the present invention are produced, Industrial water, tap water, etc. may also be used.
- the aqueous medium may contain other liquid media in addition to water.
- the liquid medium may contain water-soluble organic solvents such as monoalcohols, polyhydric alcohols, glycol ethers, and glycol esters, and is low in toxicity and unlikely to cause deterioration of the working environment due to volatile vapors. You can choose from them as needed.
- the polycarboxylic acid polymer used in the present invention is a polymer containing a structural unit derived from an unsaturated carboxylic acid monomer.
- the unsaturated carboxylic acid monomer includes a carboxy group (-COOH), a salt thereof, or a carboxylic anhydride group (-CO-O-CO-) and a polymerizable carbon-carbon double bond. It is a monomer, and in the present invention, refers to unsaturated carboxylic acids, salts thereof, and unsaturated carboxylic acid anhydrides.
- unsaturated monocarboxylic acids and their salts such as acrylic acid, methacrylic acid, crotonic acid, ⁇ -hydroxyacrylic acid, ⁇ -hydroxymethylacrylic acid; fumaric acid, maleic acid, methylene glutaric acid, itacon
- unsaturated dicarboxylic acids such as acids and their salts (which may be monosalts or disalts); unsaturated carboxylic anhydrides such as maleic anhydride and itaconic anhydride; and the like.
- salts include metal salts, ammonium salts, and organic amine salts.
- metal salts include salts with alkali metals such as sodium and potassium; alkaline earth metals such as calcium and magnesium; transition metals such as iron and aluminum; and the like.
- organic amine salts include salts with alkylamines such as methylamine, n-butylamine, diethylamine, and triethylamine; alkanolamines such as monoethanolamine, diethanolamine, triethanolamine, and dipropanolamine; and polyamines such as ethylenediamine and diethylenetriamine. is exemplified.
- Ammonium salts are salts with ammonia.
- the structural unit derived from an unsaturated carboxylic acid monomer is a structural unit formed by polymerization of an unsaturated carboxylic acid monomer, and specifically Specifically, it has a structure in which the polymerizable carbon-carbon double bond of an unsaturated carboxylic acid monomer becomes a single bond.
- the structural unit derived from the unsaturated carboxylic acid monomer is represented by -CH 2 -CH(COOH)-. be able to.
- structural units formed by methods other than polymerization of unsaturated carboxylic acid monomers are also considered to be unsaturated, as long as they have the same structure as the structural units derived from unsaturated carboxylic acid monomers. Contained in structural units derived from saturated carboxylic acid monomers.
- the polycarboxylic acid polymer used in the present invention may contain one type or two or more types of structural units derived from unsaturated carboxylic acid monomers.
- the above-mentioned polycarboxylic acid polymer may contain a total of two or more carboxy groups and/or salts thereof in one molecule, or two or more carboxylic acid anhydride groups in one molecule.
- the polycarboxylic acid polymer used in the present invention may have a structural unit derived from a monomer other than the unsaturated carboxylic acid monomer (hereinafter also referred to as "other monomer”).
- Other monomers are not particularly limited, but specifically include 3-allyloxy-2-hydroxypropanesulfonic acid, (meth)allylsulfonic acid, isoprenesulfonic acid, vinylsulfonic acid, styrenesulfonic acid, and these.
- Sulfonic acid monomers such as salts of vinylpyridine, vinylimidazole, dimethylaminoethyl (meth)acrylate, dimethylaminopropyl acrylate, aminoethylmethacrylate, diallylamine, diallyldimethylamine, and their quaternized products and salts.
- Amino group-containing monomer Nitrogen-containing monomer such as (meth)acrylonitrile; N-vinylpyrrolidone, N-vinylformamide, N-vinylacetamide, N-vinyl-N-methylformamide, N-vinyl-N- N-vinyl monomers such as methylacetamide and N-vinyloxazolidone; amides such as (meth)acrylamide, N,N-dimethyl (meth)acrylamide, N-isopropyl (meth)acrylamide, and dimethylaminoethyl (meth)acrylamide Monomer; Unsaturated alcohol monomer such as 3-(meth)allyloxy-1,2-dihydroxypropane, (meth)allyl alcohol, isoprenol; Structure in which alkylene oxide is added to the above unsaturated alcohol monomer Polyalkylene glycol monomer having; methyl (meth)acrylate, ethyl (meth)acrylate, n-propyl (me
- Ethylene glycol dimethacrylate diethylene glycol dimethacrylate, triethylene glycol dimethacrylate, tetraethylene glycol dimethacrylate, polyethylene glycol dimethacrylate, 1,3-butanediol dimethacrylate, 1,4-butanediol dimethacrylate, 1,6- Hexanediol dimethacrylate, 1,9-nonanediol dimethacrylate, neopentyl glycol dimethacrylate, dipropylene glycol dimethacrylate, polypropylene glycol dimethacrylate, trimethylolpropane trimethacrylate, pentaerythritol trimethacrylate, pentaerythritol tetramethacrylate, dipentaerythritol Polyvalent methacrylic acid esters such as hexamethacrylate; Unsaturated glycidyl compounds such as (meth)
- Alkenyl group-containing hydrocarbons such as isobutylene, 1,3-butadiene, octene, and trivinylcyclohexane; Vinyl carboxylates such as vinyl acetate and vinyl propionate (among them, esters of saturated fatty acids and vinyl alcohol are preferred) , esters of saturated fatty acids having 1 to 5 carbon atoms and vinyl alcohol are more preferred); alkoxysilyl group-containing silane coupling agents [vinyltrimethoxysilane, vinyltriethoxysilane, vinyltri(methoxyethoxy)silane, ⁇ -(methoxyethoxy)silane, ) acryloyloxypropyltrimethoxysilane, 2-styrylethyltrimethoxysilane, etc.], silane coupling agents containing halogenated silyl groups [vinyltrichlorosilane, etc.], silane coupling agents containing silanol groups [ ⁇ -(meth)
- structural units derived from other monomers are structural units formed by polymerization of other monomers, and specifically, structural units derived from other monomers are structural units derived from other monomers. It has a structure in which the polymerizable carbon-carbon double bond of the monomer becomes a single bond.
- the structural unit derived from the other monomer is -CH 2 -CH(COOC 4 H 9 )-, can be expressed.
- the polycarboxylic acid polymer used in the present invention may have a crosslinked structure and be included in the polycarboxylic acid polymer particles, or it may be a polymer that does not have a crosslinked structure.
- the polymer that does not have a crosslinked structure may be included in the polycarboxylic acid polymer particles that have a crosslinked structure.
- particles containing a polycarboxylic acid polymer are also referred to as "polycarboxylic acid polymer particles.”
- Polycarboxylic acid polymer particles containing a polycarboxylic acid polymer having a crosslinked structure naturally have a crosslinked structure.
- polycarboxylic acid polymer is a polymer without a crosslinked structure, based on the total 100 mol% of structural units derived from unsaturated carboxylic acid monomers and structural units derived from other monomers. It preferably contains structural units derived from unsaturated carboxylic acid monomers from 50 mol% to 100 mol%, more preferably from 70 mol% to 100 mol%, and from 90 mol% to 100 mol%. % or less is more preferable. By being within the above range, the blending stability of the rubber reinforcing fiber treatment agent tends to improve.
- polycarboxylic acid polymer is a polymer without a crosslinked structure, based on the total 100 mol% of structural units derived from unsaturated carboxylic acid monomers and structural units derived from other monomers. It preferably contains structural units derived from acrylic acid or acrylic acid salts from 50 mol% to 100 mol%, more preferably from 70 mol% to 100 mol%, and from 90 mol% to 100 mol%. It is even more preferable. By being within the above range, the blending stability of the rubber reinforcing fiber treatment agent tends to improve. Examples of the salt in the acrylate include salts similar to the above salts.
- Structural units derived from acrylic acid or acrylates may contain only either a structural unit derived from acrylic acid or a structural unit derived from acrylates, or may contain both, and may be derived from acrylates. It may contain one or more types of structural units.
- the polycarboxylic acid polymer used in the present invention preferably contains a neutralized carboxy group. That is, it is preferable that some or all of the carboxy groups contained in the polymer are salts of carboxy groups.
- the pH of the aqueous polymer solution is preferably 3.5 to 10.0, more preferably 5.0 to 9.5, and even more preferably 6.0 to 9.0. By being within the above range, the blending stability of the rubber reinforcing fiber treatment agent tends to improve. Note that pH is a value measured by a glass electrode method. Note that the "salt" in the salt of the carboxy group is exemplified by the same salt as the salt in the unsaturated carboxylic acid monomer.
- the polycarboxylic acid polymer may contain a structural unit derived from a metal salt of an unsaturated carboxylic acid and/or a structural unit derived from an organic amine salt of an unsaturated carboxylic acid and/or an ammonium salt of an unsaturated carboxylic acid. is preferred.
- "contains a structural unit derived from a metal salt of an unsaturated carboxylic acid” means that at least one carboxy group contained in the structural unit derived from an unsaturated carboxylic acid is a salt with a metal (for example, -COO - X + represents a metal cation ) .
- the metal salt include the metal salts listed above.
- "contains a structural unit derived from an organic amine salt of an unsaturated carboxylic acid” means that at least one carboxyl group contained in the structural unit derived from an unsaturated carboxylic acid is a salt with an organic amine compound (for example, - COO ⁇ X + (X + represents an organic ammonium cation).
- organic amine salt include the organic amine salts listed above. Also, salts with primary amines, salts with secondary amines, salts with tertiary amines, quaternary ammonium salts, etc. are not particularly limited, and salts with amines having only one amino group may be used.
- salts with amines having two or more amino groups such as salts with diamines, salts with triamines, and salts with polyamines.
- X in the organic amine salt the molar ratio of nitrogen atoms to carbon atoms is preferably 1:1 to 1:20, more preferably 1:1 to 1:10.
- "contains a structural unit derived from an ammonium salt of an unsaturated carboxylic acid” refers to a state in which at least one carboxy group contained in the structural unit derived from an unsaturated carboxylic acid forms a salt with ammonia. represents.
- the above-mentioned polycarboxylic acid polymer contains a metal salt of an unsaturated carboxylic acid based on a total of 100 mol% of structural units derived from unsaturated carboxylic acid monomers and structural units derived from other monomers. It is preferable to contain a total of 50 mol% or more and 100 mol% or less, and 70 mol% or more and 100 mol% of the structural units derived from the organic amine salt of unsaturated carboxylic acid and the ammonium salt of unsaturated carboxylic acid. % or less, and even more preferably 90 mol% or more and 100 mol% or less.
- Structural units derived from metal salts of unsaturated carboxylic acids and/or structural units derived from organic amine salts of unsaturated carboxylic acids and/or ammonium salts of unsaturated carboxylic acids contain one or more of them. It may contain one type or two or more types of each. It is more preferable to include a structural unit derived from an organic amine salt of an unsaturated carboxylic acid. By being within the above range, the blending stability of the rubber reinforcing fiber treatment agent tends to improve.
- the polycarboxylic acid polymer used in the present invention is a polymer that does not have a crosslinked structure
- the blending stability of the rubber reinforcing fiber treatment agent is improved, so that the weight average molecular weight is 500 or more, 100,000 It is preferably below, preferably 1,500 or more and 80,000 or less, more preferably 2,000 or more and 50,000 or less.
- the above weight average molecular weight is a value measured by the measuring method described below.
- water-insoluble means that the polycarboxylic acid polymer particles can maintain their particle shape in water at a liquid temperature of 25° C. at a solid content of 20% or less.
- Each structural unit in the polycarboxylic acid polymer used in the present invention may be present randomly or regularly, such as in a block shape.
- the polycarboxylic acid polymer particles may have a uniform composition as a whole, or particles with partially different compositions, such as particles having a core-shell structure including a core portion and a shell portion provided on the surface of the particle ( core-shell particles).
- the content of the shell part in the core-shell particles is preferably 10% by mass or more, more preferably 20% by mass or more, even more preferably 30% by mass or more, and particularly preferably 50% by mass or more, based on 100% by mass of the core-shell particles.
- at least the surface layer of the polycarboxylic acid polymer particles contains the polycarboxylic acid polymer.
- the shell portion has a plurality of layers, it is preferable that at least the outermost layer (the layer located on the surface side of the particle) contains a polycarboxylic acid polymer.
- the content of the polycarboxylic acid polymer in the polycarboxylic acid polymer particles is preferably 0.1% by mass or more, more preferably 1% by mass or more, even more preferably 10% by mass or more based on 100% by mass of the particles. , still more preferably 20% by mass or more, even more preferably 50% by mass or more, even more preferably 70% by mass or more, and particularly preferably 90% by mass or more.
- the content ratio of the polycarboxylic acid polymer in the shell part is preferably 50% by mass or more, more preferably 60% by mass, even more preferably 80% by mass, and 90% by mass in 100% by mass of the shell part. % is particularly preferred.
- the volume average particle diameter of the polycarboxylic acid polymer particles is preferably 10 nm to 10 ⁇ m, more preferably 50 nm to 5 ⁇ m, even more preferably 100 nm to 1 ⁇ m, and even more preferably 150 to 500 nm. Particularly preferred.
- the volume average particle diameter is 10 nm to 10 ⁇ m, the adhesion between the rubber reinforcing fiber and the rubber composition in a high-temperature environment tends to be significantly improved.
- the volume average particle diameter is a value determined by measuring the particle size distribution of a particle dispersion using a dynamic light scattering particle size distribution measuring device and by analysis based on Gaussian distribution.
- Methods for producing the polycarboxylic acid polymer include, for example, various conventionally known methods or combinations thereof, and are not particularly limited. It can be produced by a method including a step of polymerizing monomer components (hereinafter, the step of polymerizing monomer components is also referred to as a "polymerization step"). In addition, a method including a step of polymerizing a monomer component that essentially includes a polymerizable monomer that can generate a carboxyl group by hydrolysis, and a step of hydrolyzing a precursor of the polymer obtained thereby. It can also be manufactured. When producing polycarboxylic acid polymer particles using this method, hydrolysis may be performed after producing particles containing a polymer precursor in the polymerization step.
- the polymerization method in the polymerization step is not particularly limited, but for example, a solution polymerization method, bulk polymerization, suspension polymerization method, reverse phase suspension polymerization method, or cast polymerization method, thin film polymerization method, spray polymerization method, etc. are adopted. be able to.
- a solution polymerization method for example, a solution polymerization method, bulk polymerization, suspension polymerization method, reverse phase suspension polymerization method, or cast polymerization method, thin film polymerization method, spray polymerization method, etc.
- resin particles such as suspension polymerization and emulsion polymerization
- solution polymerization is preferred.
- the above polymerization step can be carried out either batchwise or continuously.
- Examples of the polymerizable monomer that can generate a carboxyl group by hydrolysis include unsaturated carboxylic acid esters, unsaturated carboxylic acid anhydrides, and the like.
- Examples of the unsaturated carboxylic acid esters include esters of the above-mentioned unsaturated carboxylic acids (esters of the above-mentioned unsaturated monocarboxylic acids, monoesters and diesters of the above-mentioned unsaturated dicarboxylic acids), and the like. Other monomers listed above may also be used.
- esters of unsaturated monocarboxylic acids such as acrylic acid, methacrylic acid, crotonic acid, ⁇ -hydroxyacrylic acid, ⁇ -hydroxymethylacrylic acid
- unsaturated dicarboxylic acids such as fumaric acid, maleic acid, methylene glutaric acid, itaconic acid, etc.
- Acid esters (monoesters, diesters); etc. are exemplified.
- Examples of the unsaturated carboxylic anhydride include the aforementioned maleic anhydride and itaconic anhydride.
- the above-mentioned alkyl esters of unsaturated carboxylic acids [alkyl esters of unsaturated monocarboxylic acids, alkyl esters of unsaturated dicarboxylic acids (monoalkyl esters and dialkyl esters)] and unsaturated carboxylic acid anhydrides are preferred, alkyl esters of the unsaturated carboxylic acids having 1 to 10 carbon atoms are more preferred, alkyl esters of the unsaturated carboxylic acids having 1 to 5 carbon atoms are even more preferred, and the unsaturated carboxylic acids Alkyl esters of acids having 1 to 4 carbon atoms are even more preferred, alkyl esters of 1 or 2 carbon atoms of the unsaturated carboxylic acids are even more preferred, and alkyl esters of the unsaturated carboxylic acids having 1
- the total content of structural units derived from the unsaturated carboxylic acid monomer and the polymerizable monomer that can generate a carboxyl group by hydrolysis is based on 100% by mass of the polymer. , preferably 0.1% by mass or more, more preferably 1% by mass or more, even more preferably 10% by mass or more, even more preferably 20% by mass or more, even more preferably 50% by mass or more, even more preferably 70% by mass or more. It is preferably 90% by mass or more, particularly preferably 90% by mass or more.
- At least one crosslinking monomer selected from the group consisting of the aforementioned divinylbenzene, 1,3-butadiene, diallyl ethers, and polyvalent methacrylic acid esters. It is preferable to use Among these, divinylbenzene and 1,3-butadiene are more preferred, and divinylbenzene is even more preferred.
- polycarboxylic acid polymer in the polycarboxylic acid polymer particles include (meth)acrylic acid-ethylene glycol dimethacrylate copolymer, (meth)acrylic acid-triethylene glycol dimethacrylate copolymer, ( Meth)acrylic acid-trimethylolpropane trimethacrylate copolymer, (meth)acrylic acid-polyethylene glycol diallyl ether copolymer, (meth)acrylic acid-divinylbenzene copolymer, methyl acrylate-ethylene glycol dimethacrylate copolymer Hydrolyzate of methyl acrylate-triethylene glycol dimethacrylate copolymer, hydrolyzate of methyl acrylate-polyethylene glycol diallyl ether copolymer, hydrolyzate of methyl acrylate-divinylbenzene copolymer, ⁇ Examples include a hydrolyzate of methyl-hydroxyacrylate-trimethylolpropane trimeth
- the outermost layer of the shell portion contains the above-mentioned polycarboxylic acid polymer.
- the polymer constituting the core portion is not particularly limited, and examples thereof include polymethyl methacrylate, polybutyl acrylate, polystyrene, methacrylic acid-styrene copolymer, methacrylic acid-butyl acrylate copolymer, and the like.
- a polymerization initiator when performing polymerization.
- the polymerization initiator include hydrogen peroxide; persulfates such as sodium persulfate, potassium persulfate, and ammonium persulfate; dimethyl 2,2'-azobis(2-methylpropionate), 2,2'-azobis (isobutyronitrile), 2,2'-azobis(2-methylpropionamidine) dihydrochloride, 2,2'-azobis[N-(2-carboxyethyl)-2-methylpropionamidine] hydrate, Azo compounds such as 2,2'-azobis[2-(2-imidazolin-2-yl)propane], 2,2'-azobis(1-imino-1-pyrrolidino-2-methylpropane) dihydrochloride; Organic peroxides such as benzoyl peroxide, lauroyl peroxide, peracetic acid, di-t-butyl peroxide, and cumen
- polymerization initiators hydrogen peroxide and persulfates are preferred, and persulfates are most preferred.
- the amount of the polymerization initiator used is preferably 0.1 g or more and 25 g or less, and 0.1 g or more and 20 g or less per 1 mol of monomers (total monomers). More preferably, the amount is 0.1 g or more and 12 g or less.
- chain transfer agent may be used as necessary.
- chain transfer agents include thiol chain transfer agents such as mercaptoethanol, thioglycolic acid, mercaptopropionic acid, and n-dodecyl mercaptan; halogens such as carbon tetrachloride, methylene chloride, bromoform, and bromotrichloroethane; secondary alcohols such as isopropanol and glycerin; hypophosphorous acid (salts) such as hypophosphorous acid and sodium hypophosphite (including their hydrates); phosphorous acid and sodium phosphite Phosphite (salt) such as; Sulfurous acid (salt) such as sodium sulfite and potassium sulfite; Bisulfite (salt) such as sodium hydrogen sulfite and potassium hydrogen sulfite; Dithionite (salt) such as sodium dithionite; Examples include pyros
- the above chain transfer agents may be used alone or in the form of a mixture of two or more.
- the amount of the chain transfer agent used is preferably 0 g or more and 20 g or less, more preferably 0 g or more and 15 g or less, per 1 mole of monomers (total monomers) used. More preferably, it is 1 g or more and 7 g or less.
- heavy metal ions may be used for the purpose of promoting the reaction.
- heavy metal ions mean metal ions having a specific gravity of 4 g/cm 3 or more.
- the heavy metal ion is not particularly limited as long as it is contained in the form of an ion, but it is preferable to use a solution obtained by dissolving a heavy metal compound because it is easy to handle.
- the heavy metal compounds include ammonium iron (II) sulfate hexahydrate, ferrous sulfate heptahydrate, ferrous chloride, ferric chloride, manganese chloride, and the like.
- the amount of the heavy metal ion used is preferably 0 ppm or more and 100 ppm or less, more preferably 0 ppm or more and 50 ppm or less, based on the total amount of the polymerization reaction solution.
- the solvent preferably contains water, more preferably 50% by mass or more and 100% by mass or less, and even more preferably 80% by mass or more and 100% by mass or less, based on the total amount of the solvent.
- Solvents that can be used in the above polymerization step include water; lower alcohols such as methanol, ethanol, and isopropyl alcohol; lower ketones such as acetone, methyl ethyl ketone, and diethyl ketone; ethers such as dimethyl ether and dioxane; and amides such as dimethyl formamide. Examples include: These solvents may be used alone or in the form of a mixture of two or more.
- the amount of the solvent used is preferably 40 to 400% by weight based on 100% by weight of the monomer. More preferably, it is 45% by mass or more, and still more preferably 50% by mass or more. Moreover, it is more preferably 350% by mass or less, and still more preferably 300% by mass or less. If the amount of solvent used is less than 40% by mass, the molecular weight of the obtained polymer may become high, and if it exceeds 400% by mass, the concentration of the obtained polymer will be low and storage costs will be high. There is a risk that
- the polymerization temperature is not particularly limited, but it is preferably carried out at 0°C or higher, and preferably at 150°C or lower.
- the temperature is more preferably 40°C or higher, still more preferably 60°C or higher, and particularly preferably 80°C or higher. Further, the temperature is more preferably 120°C or lower, and still more preferably 110°C or lower.
- the above polymerization temperature does not need to be kept almost constant during the polymerization reaction; for example, start polymerization from room temperature, raise the temperature to a set temperature at an appropriate temperature increase time or rate, and then increase the set temperature. The temperature may be maintained, or the temperature may be varied (increased or decreased) over time during the polymerization reaction depending on the method of dropping the monomer components, initiator, etc.
- the polymerization time in the above polymerization step is not particularly limited, but for example, when carried out batchwise, it is preferably 30 to 500 minutes.
- the pressure in the reaction system in the above polymerization step may be normal pressure (atmospheric pressure), reduced pressure, or increased pressure. It is preferable to seal the inside of the system and carry out the reaction under pressure. Furthermore, it is preferable to perform the reaction under normal pressure (atmospheric pressure) in terms of equipment such as a pressurizing device, a pressure reducing device, a pressure-resistant reaction container, and piping.
- the atmosphere in the reaction system may be an air atmosphere or an inert atmosphere. For example, the atmosphere in the reaction system may be replaced with an inert gas such as nitrogen before starting the polymerization.
- the polycarboxylic acid polymer used in the present invention is optional, it may be manufactured by including steps other than the above polymerization step. Examples include an aging step, a neutralization step, a deactivation step of a polymerization initiator or a chain transfer agent, a dilution step, a drying step, a concentration step, a purification step, and the like.
- the polycarboxylic acid polymer When a polycarboxylic acid polymer having a crosslinked structure contained in the polycarboxylic acid polymer particles is used, the polycarboxylic acid polymer will be crosslinked in addition to the structural units derived from the unsaturated carboxylic acid monomer.
- This structure not only improves the adhesion between the rubber reinforcing fibers and the rubber composition, but also has the excellent effect of significantly improving the adhesion between the rubber reinforcing fibers and the rubber composition in high-temperature environments. is obtained.
- Polycarboxylic acid polymers contain structural units formed by polymerization of hydrophilic unsaturated carboxylic acid monomers, and are therefore usually water-soluble polymers.
- polycarboxylic acid polymers having a crosslinked structure and polycarboxylic acid polymer particles having a crosslinked structure are water-insoluble fine particles.
- polycarboxylic acid polymers having a crosslinked structure or polycarboxylic acid polymer particles having a crosslinked structure for example, the proportion of the structural units constituting the crosslinked structure in the structural units constituting the polymer or particles can be adjusted. By doing so, it can be made water insoluble.
- Epoxy compounds include ethylene glycol glycidyl ether, glycerol polyglycidyl ether, diglycerol polyglycidyl ether, sorbitol polyglycidyl ether, polyglycerol polyglycidyl ether, bisphenol A diglycidyl ether, bisphenol S diglycidyl ether, novolac glycidyl ether, Glycidyl ethers such as brominated bisphenol A diglycidyl ether; glycidyl esters such as hexahydrophthalic acid glycidyl ester and dimer acid glycidyl ester; triglycidyl isocyanurate, glycidyl hydantoin, tetraglycidyl diaminodiphenylmethane, triglycidyl para-aminophenol, triglycidyl meta-amino Glycidyl amines such as
- ethylene glycol glycidyl ether, glycerol polyglycidyl ether, diglycerol polyglycidyl ether, sorbitol polyglycidyl ether, and polyglycerol polyglycidyl ether are preferred, and are commercially available.
- Denacol (registered trademark) series manufactured by Nagase ChemteX Co., Ltd. can be preferably used. Further, these may be used alone or in combination of two or more.
- Rubber latex having a structure derived from vinylpyridine in the polymer molecule Rubber latex having a structure derived from vinylpyridine in the polymer molecule is a rubber component (used in the present invention) having a structure derived from vinylpyridine in the polymer molecule. (excluding polycarboxylic acid polymers and epoxy compounds) is emulsified and dispersed in an aqueous medium.
- a rubber component having a structure derived from vinylpyridine in the polymer molecule contains a polymer molecule that is a copolymer of a rubber-forming monomer and vinylpyridine, and the rubber-forming monomers include ethylene, Examples include propylene, butadiene, isoprene, isobutylene, styrene, and the like. Among the copolymers, vinylpyridine-styrene-butadiene copolymers are preferred.
- the vinylpyridine-styrene-butadiene copolymer preferably used in the present invention has a monomer content of 0.5 to 30% by mass of vinylpyridine, 10 to 60% by mass of styrene, and butadiene. is preferably 30 to 80% by mass. After polymerizing a monomer mixture consisting of a vinylpyridine content of 0.5 to 15% by weight, a styrene content of 30 to 60% by weight, and a butadiene content of less than 60% by weight, a vinylpyridine content of 5% by weight is subsequently polymerized.
- a vinylpyridine-styrene-butadiene system with a double structure obtained by polymerizing a monomer mixture consisting of ⁇ 20% by mass, a styrene content of 10-40% by mass, and a butadiene content of 45-75% by mass.
- Polymeric latex can also be preferably used. It may also be a copolymer latex obtained by further polymerizing monomers other than vinylpyridine, styrene, and butadiene.
- a rubber latex that has a structure derived from vinylpyridine in its polymer molecule and a rubber latex that does not have a structure derived from vinylpyridine in its polymer molecule can also be used in combination.
- Rubber latexes that do not have a structure derived from vinylpyridine in their polymer molecules include natural rubber latex, styrene-butadiene copolymer rubber latex, carboxyl group-modified styrene-butadiene copolymer rubber latex, nitrile rubber latex, and chloroprene rubber. Examples include latex.
- styrene-butadiene copolymer rubber latex carboxyl group-modified styrene-butadiene copolymer rubber latex, etc. are preferred.
- a vinylpyridine-styrene-butadiene copolymer rubber latex and a styrene-butadiene copolymer latex it is preferable to use a vinylpyridine-styrene-butadiene copolymer rubber latex and a styrene-butadiene copolymer latex.
- the blending ratio of the two latexes is not particularly limited, and for example, the solid content mass ratio of vinylpyridine-styrene-butadiene copolymer rubber latex and styrene-butadiene copolymer latex is 40:60 to 95:5. The ratio is preferably 60:40 to 90:10.
- a blocked isocyanate compound is a compound having a blocked isocyanate group in its molecule (the polycarboxylic acid polymer used in the present invention, an epoxy compound, and a rubber component having a structure derived from vinylpyridine in the polymer molecule). ), for example, by subjecting the isocyanate groups of a known polyisocyanate compound to an addition reaction with a known blocking agent. Specifically, it can be synthesized, for example, by reacting the following raw material components (a), (b), and, if necessary, (c). (a) Polyisocyanate compound (b) Blocking agent (c) Active hydrogen group-containing compound (excluding the above components (a) and (b))
- the blocked isocyanate compound preferably has a plurality of blocked isocyanate groups in the molecule.
- polyisocyanate compound (a) Polyisocyanate compound (hereinafter referred to as “polyisocyanate compound (a)"
- the polyisocyanate compound (a) is not particularly limited, and examples thereof include aromatic polyisocyanates, araliphatic polyisocyanates, aliphatic polyisocyanates, alicyclic polyisocyanates, and polyisocyanate derivatives including derivatives of these polyisocyanates. can be mentioned.
- aromatic polyisocyanate for example, tolylene diisocyanate (2,4- or 2,6-tolylene diisocyanate or a mixture thereof) (TDI), phenylene diisocyanate (m-, p-phenylene diisocyanate or a mixture thereof) , 4,4'-biphenyl diisocyanate, 1,5-naphthalene diisocyanate (NDI), diphenylmethane diisocyanate (4,4'-, 2,4'- or 2,2'-diphenylmethane diisocyanate, or a mixture of two or more thereof ) (MDI), o-tolidine diisocyanate (TODI), and 4,4'-diphenyl ether diisocyanate.
- TDI tolylene diisocyanate (2,4- or 2,6-tolylene diisocyanate or a mixture thereof)
- phenylene diisocyanate m-, p-phenylene diisocyan
- Examples of the araliphatic polyisocyanate include xylylene diisocyanate (1,3- or 1,4-xylylene diisocyanate or a mixture thereof) (XDI), tetramethylxylylene diisocyanate (1,3- or 1, Examples include 4-tetramethylxylylene diisocyanate (or a mixture thereof) (TMXDI), ⁇ , ⁇ '-diisocyanate-1,4-diethylbenzene, and the like.
- XDI xylylene diisocyanate (1,3- or 1,4-xylylene diisocyanate or a mixture thereof)
- TXDI 4-tetramethylxylylene diisocyanate
- ⁇ , ⁇ '-diisocyanate-1,4-diethylbenzene and the like.
- aliphatic polyisocyanate examples include trimethylene diisocyanate, 1,2-propylene diisocyanate, butylene diisocyanate (tetramethylene diisocyanate, 1,2-butylene diisocyanate, 2,3-butylene diisocyanate or 1,3-butylene diisocyanate), 1 , 5-pentamethylene diisocyanate (PDI), 1,6-hexamethylene diisocyanate, 2,6-diisocyanate methyl caproate and the like.
- trimethylene diisocyanate 1,2-propylene diisocyanate
- butylene diisocyanate tetramethylene diisocyanate, 1,2-butylene diisocyanate, 2,3-butylene diisocyanate or 1,3-butylene diisocyanate
- PDI 5-pentamethylene diisocyanate
- 1,6-hexamethylene diisocyanate 2,6-diisocyanate methyl caproate and the like
- alicyclic polyisocyanate examples include 1,3-cyclopentane diisocyanate, 1,3-cyclopentene diisocyanate, cyclohexane diisocyanate (1,4-cyclohexane diisocyanate or 1,3-cyclohexane diisocyanate), 3-isocyanatomethyl-3 , 5,5-trimethylcyclohexyl isocyanate (isophorone diisocyanate) (IPDI), methylene bis(cyclohexyl isocyanate) (4,4'-, 2,4'- or 2,2'-methylene bis(cyclohexyl isocyanate), trans of these, trans-form, trans, cis-form, cis, cis-form, mixture of two or more of these) (H12MDI), methylcyclohexane diisocyanate (methyl-2,4-cyclohexane diisocyanate or methyl-2,6-cyclohexane diis
- polyisocyanate derivatives examples include multimers (e.g. dimers, trimers (e.g. isocyanurate modified products, iminooxadiazinedione modified products), pentamers) of the above-mentioned polyisocyanates (monomers).
- allophanate modified products for example, the isocyanate groups of the polyisocyanate (monomer) are added to the urethane group formed by the reaction of the polyisocyanate (monomer) described above and the low molecular weight polyol described below
- Allophanate modified product e.g., allophanate modified product produced by addition of
- adduct product e.g., adduct product (alcohol adduct) produced by reaction of polyisocyanate (monomer) with low molecular weight polyol described below
- biuret modified product for example, biuret modified products produced by the reaction of the above polyisocyanate (monomer) with water or amines
- urea modified products for example, the reaction of the above polyisocyanate (monomer) with diamine, etc.
- urea modified products produced by further adding isocyanate groups of polyisocyanate (monomer) to the urea groups formed
- carbodiimide modified products carbodiimide modified products, etc. produced by decarboxylation condensation reaction of the above-mentioned polyisocyanate (monomer)
- uretdione modified products uretonimine modified products, etc.
- Further examples include polymethylene polyphenyl polyisocyanate (crude MDI, polymeric MDI).
- polyisocyanate compound (a) Only one type of polyisocyanate compound (a) may be used, or two or more types may be used in combination.
- two or more types of polyisocyanate compounds (a) in combination for example, two or more types of polyisocyanate compounds may be reacted simultaneously during the production of block isocyanate, or each polyisocyanate compound may be used individually. You may mix the block isocyanate obtained by
- polyisocyanate compound (a) aliphatic polyisocyanates and derivatives thereof, alicyclic polys Isocyanates and their derivatives, aromatic polyisocyanates and their derivatives are preferred.
- blocking agent (b) Blocking agent
- a blocking agent is a blocking agent that inactivates (protects) an isocyanate group by adding to an isocyanate group through an addition reaction to form a blocked isocyanate group, and on the other hand, removes (deprotects) from the blocked isocyanate group by heating etc. This refers to a compound that has the function of reforming isocyanate groups and regenerating reaction activity.
- Examples of the blocking agent (b) include alcohol compounds, alkylphenol compounds, phenol compounds, active methylene compounds, mercaptan compounds, acid amide compounds, acid imide compounds, imidazole compounds, imidazoline compounds, Examples include pyrimidine compounds, guanidine compounds, triazole compounds, carbamate compounds, urea compounds, oxime compounds, amine compounds, imide compounds, imine compounds, pyrazole compounds, and bisulfites.
- acid amide compounds active methylene compounds, oxime compounds, and pyrazole compounds are preferred, such as ⁇ -caprolactam, acetylacetone, diethyl malonate, methyl ethyl ketone oxime, cyclohexanone oxime, 3-methylpyrazole, 3,5-dimethylpyrazole, etc. is more preferable.
- Only one type of blocking agent (b) may be used, or two or more types may be used in combination.
- Active hydrogen group-containing compound (hereinafter referred to as “active hydrogen group-containing compound (c)"
- the active hydrogen group-containing compound (c) is not particularly limited, and includes various alcohols, polyols, and amines containing active hydrogen groups.
- the active hydrogen group-containing alcohols are not particularly limited, and include, for example, polyethers obtained by adding alkylene oxide (e.g., ethylene oxide, propylene oxide, butylene oxide, etc.) to methanol, ethanol, propanol, butanol, hexanol, octanol, etc. Examples include monools. These active hydrogen group-containing alcohols may be used alone or in combination of two or more.
- alkylene oxide e.g., ethylene oxide, propylene oxide, butylene oxide, etc.
- alkylene oxide e.g., ethylene oxide, propylene oxide, butylene oxide, etc.
- Examples include monools.
- These active hydrogen group-containing alcohols may be used alone or in combination of two or more.
- the active hydrogen group-containing polyol is not particularly limited, and includes, for example, ethylene glycol, propylene glycol, 1,3-propanediol, 1,4-butylene glycol, 1,3-butylene glycol, 1,2-butylene glycol, 1 , 5-pentanediol, 1,6-hexanediol, neopentyl glycol, 3-methyl-1,5-pentanediol, 2,2,2-trimethylpentanediol, 3,3-dimethylolheptane, alkanes (C7- 20) Diols, 1,3- or 1,4-cyclohexanedimethanol or mixtures thereof, 1,3- or 1,4-cyclohexanediol or mixtures thereof, hydrogenated bisphenol A, 1,4-dihydroxy- Dihydric alcohols such as 2-butene, 2,6-dimethyl-1-octene-3,8-diol, bisphenol A, di
- polyoxypropylene polyoxyethylene copolymer diol or triol polyoxypropylene polyoxyethylene block polymer diol or triol, Pluronic (registered trademark) type polypropylene glycol or triol made by addition polymerizing ethylene oxide to the end of polypropylene glycol
- polyoxyethylene bisphenol Polyether polyols such as A ether, polyoxypropylene trimethylol propane ether, and polytetramethylene ether polyols
- polyester polyols such as adipic acid polyester polyols, phthalic acid polyester polyols, and lactone polyester polyols
- polycarbonate polyols, polyurethane polyols examples include polyols obtained by urethane-modifying ether polyols, polyester polyols, and polycarbonate polyols with polyisocyanates), epoxy polyols, vegetable oil polyols, acrylic polyols, and vinyl monomer-modified polyols.
- the active hydrogen group-containing amine is not particularly limited, but specifically diamines and polyamines can be used.
- diamines include ethylenediamine, trimethylenediamine, piperazine, isophoronediamine, and the like
- polyamines include diethylenetriamine, dipropylenetriamine, triethylenetetramine, and the like. These active hydrogen group-containing amines may be used alone or in combination of two or more.
- polyether monool which is obtained by adding ethylene oxide to methanol, ethanol, propanol, butanol, hexanol, octanol, etc., polyoxyethylene glycol, polyoxyethylene triol, ethylene oxide and propylene oxide, etc.
- Random and/or block copolymers with alkylene oxide e.g., polyoxypropylene polyoxyethylene copolymer diols or triols, polyoxypropylene polyoxyethylene block polymer diols or triols, addition polymerization of ethylene oxide to the terminals of polypropylene glycol
- Hydrophilic compounds such as Pluronic® type polypropylene glycol or triol
- can introduce hydrophilic groups such as oxyethylene groups
- an anionic or cationic hydrophilic group can also be used.
- the number average molecular weight of these hydrophilic compounds is preferably 300 to 5,000. These hydrophilic compounds may be used alone or in combination of two or more.
- the amount of these compounds introduced to impart self-emulsifying properties is preferably 1 mol% or more as a lower limit, and preferably 50 mol% or less as an upper limit, more preferably 50 mol% or less, based on the total amount of isocyanate groups subjected to the reaction. It is 40 mol% or less, more preferably 30 mol% or less.
- reaction conditions during the synthesis of the blocked isocyanate compound for example, under atmospheric pressure, under pressurized conditions, or under an atmosphere of inert gas (e.g. nitrogen gas, argon gas, etc.), the reaction conditions are 0°C or higher. It can be synthesized at a reaction temperature of 150°C or lower, preferably 30°C or higher and 100°C or lower. Further, the reaction time is, for example, 0.5 hours or more and 120 hours or less, preferably 1 hour or more and 72 hours or less.
- inert gas e.g. nitrogen gas, argon gas, etc.
- the reaction can be carried out without a solvent; for example, ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, and cyclohexanone; nitriles such as acetonitrile; and alkyl esters such as methyl acetate, ethyl acetate, butyl acetate, and isobutyl acetate.
- ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, and cyclohexanone
- nitriles such as acetonitrile
- alkyl esters such as methyl acetate, ethyl acetate, butyl acetate, and isobutyl acetate.
- aliphatic hydrocarbons such as n-hexane, n-heptane, and octane
- alicyclic hydrocarbons such as cyclohexane and methylcyclohexane
- aromatic hydrocarbons such as toluene, xylene, and ethylbenzene
- methyl cellosolve acetate, ethyl Glycol ether esters such as cellosolve acetate, methyl carbitol acetate, ethyl carbitol acetate, ethylene glycol ethyl ether acetate, propylene glycol methyl ether acetate, 3-methyl-3-methoxybutyl acetate, ethyl-3-ethoxypropionate
- Ethers such as diethyl ether, tetrahydrofuran, dioxane, 1,2-dimethoxyethane, diethylene glycol dimethyl ether, diethylene glycol diethy
- the reaction order is not limited to the above, for example, first, the polyisocyanate compound (a) is reacted with the blocking agent (b) in a proportion that unreacted isocyanate groups remain, and then the polyisocyanate compound (a) is used as necessary.
- a blocked isocyanate compound can also be obtained by reacting an active hydrogen group-containing compound (c).
- the completion of the reaction can be determined, for example, by checking the concentration of isocyanate groups in the reaction solution measured according to method A of JIS K 1603-1:2007.
- a hydrophilic compound when used as the active hydrogen group-containing compound (c), a hydrophilic group can be introduced into the molecular structure of the blocked isocyanate compound, improving self-emulsifying property (dispersibility in water). can be granted.
- Such a self-emulsifying blocked isocyanate compound can be made into a water-dispersible blocked isocyanate by using the above-mentioned method of dispersing in an aqueous medium, if necessary in the presence of an emulsifier or the like.
- a water-dispersible blocked isocyanate can be obtained by dispersing the blocked isocyanate compound in an aqueous medium by applying mechanical shearing force, if necessary in the presence of an emulsifier or the like.
- the blocked isocyanate compound which is a dispersoid
- “suspension” and “emulsion” are used, in the present invention, they are referred to as “water-dispersed block isocyanate” without distinguishing between them.
- the method for obtaining the water-dispersed block isocyanate is not particularly limited, and for example, the block isocyanate compound and water or the above-mentioned aqueous medium are stirred using a stirrer such as a homomixer, homodisper, homogenizer, or magnetic stirrer.
- a stirrer such as a homomixer, homodisper, homogenizer, or magnetic stirrer.
- a method of mixing and a method of filling glass beads, zirconia beads, etc. into a dispersing machine such as a ball mill, horizontal sand mill, vertical sand mill, attritor, bead mill, etc. and dispersing by stirring at high speed can be used.
- the water-dispersed blocked isocyanate contains an unnecessary volatile organic solvent
- the water-dispersed blocked isocyanate is treated with an organic solvent, for example, by reducing the pressure or heating under reduced pressure.
- the solvent can also be removed by volatilization.
- the particle diameter of the dispersed particles of the block isocyanate compound is not particularly limited, and for example, the volume average particle diameter is 10,000 nm or less, preferably 1,000 nm or less, more preferably 700 nm or less, More preferably, it is 500 nm or less, and usually 50 nm or more. If the particle diameter of the dispersed particles of the blocked isocyanate compound is within this range, excellent dispersion stability can be ensured. Further, additives such as a dispersant and an antifoaming agent can be appropriately added to the water-dispersed blocked isocyanate, if necessary. Moreover, only one type of blocked isocyanate compound may be used, or two or more types may be used in combination.
- the processing agent kit of the present invention contains a polymer compound having an oxazoline group.
- the processing agent of the present invention also contains a polycarboxylic acid-based polymer, an epoxy compound, a rubber latex having a structure derived from vinylpyridine in the polymer molecule, and a blocked isocyanate compound, as well as a polymer having an oxazoline group.
- it contains a molecular compound.
- a polymer compound having an oxazoline group is a compound having an oxazoline group in the side chain of the polymer chain (the polycarboxylic acid polymer used in the present invention, an epoxy compound, a structure derived from vinylpyridine in the polymer molecule) rubber components and blocked isocyanate compounds).
- the compound acts as a crosslinking agent utilizing the reactivity of the oxazoline group.
- Examples of polymer chains include acrylic polymers, styrene-acrylic copolymers, and copolymers in which a polyalkylene oxide structure is graft-polymerized, and the number average molecular weight is about 5,000 to 300,000. It is preferable that there be.
- the polymer compound having an oxazoline group commercially available or known ones can be preferably used, and commercially available products include the Epocross (registered trademark) series manufactured by Nippon Shokubai Co., Ltd.
- the treatment agent of the present invention includes, for example, a polycarboxylic acid-based polymer, an epoxy compound, a rubber latex having a structure derived from vinylpyridine in the polymer molecule, and a blocked isocyanate compound in an aqueous medium. It can be obtained by mixing a polymer compound having an oxazoline group, further adding the following additives as necessary, and additionally adding an aqueous medium. The mixing order and addition order of these can be adjusted as appropriate.
- the processing agent of the present invention may be used as a processing liquid as it is when performing adhesion treatment on fibers, or may be used as a processing liquid by diluting it as appropriate when performing adhesion treatment from a highly concentrated stock liquid state. .
- the solid content (non-volatile components other than the aqueous medium) concentration is determined depending on the processing method and the desired amount of solid content adhesion to the fibers. It can be adjusted as appropriate depending on the situation, and is, for example, about 0.1 to 50% by weight, preferably 1 to 30% by weight, and more preferably 5 to 25% by weight.
- the content ratio of each component in the solid content contained in the treatment agent of the present invention can be adjusted as appropriate depending on the type of fiber used, the composition of the rubber composition, the adhesiveness obtained, etc.
- the amount of rubber latex (solid content) having a structure derived from vinylpyridine in the polymer molecule is preferably 50 to 95% by mass, and the amount of epoxy compound (solid content), blocked isocyanate compound (solid content) The amount of each is preferably 0.1 to 30% by weight.
- the solid content of the polycarboxylic acid polymer contained in the treatment agent of the present invention is preferably 0.1 to 20% by mass based on the total solid content contained in the treatment agent.
- the amount is more preferably 0.5 to 10% by weight, and even more preferably 1.0 to 5.0% by weight.
- the solid content thereof is 0.01 to 5.0% by mass of the total solid content contained in the treatment agent from the viewpoint of adhesiveness. It is preferable that More preferably 0.05 to 3.0% by mass, still more preferably 0.1 to 1.0% by mass.
- the treatment agent 1 included in the treatment agent kit of the present invention is prepared by, for example, mixing an epoxy compound and a blocked isocyanate compound in an aqueous medium, adding the following additives as necessary, and then adding the aqueous medium. You can obtain it by doing so.
- the treatment agent 2 included in the treatment agent kit of the present invention includes, for example, rubber latex having a structure derived from vinylpyridine in the polymer molecule, a polycarboxylic acid polymer, and a polymer compound having an oxazoline group in an aqueous medium. It can be obtained by mixing, further adding the following additives as necessary, and additionally adding an aqueous medium. The mixing order and addition order of these can be adjusted as appropriate.
- the processing agent 1 and the processing agent 2 contained in the processing agent kit of the present invention may be used as processing liquids to be used as they are when performing adhesion treatment on fibers, or may be used as processing liquids as appropriate when performing adhesion treatment from a highly concentrated stock liquid state. It may also be used as a processing fluid by diluting it.
- the solid content (non-volatile components other than the aqueous medium) concentration depends on the processing method and the desired amount of solid content adhering to the fibers. It can be adjusted as appropriate, and is, for example, about 0.1 to 20% by mass, preferably 1 to 5% by mass.
- the content ratio of each component in the solid content contained in the treatment agent 1 can be adjusted as appropriate depending on the type of fiber used, the composition of the rubber composition, the adhesiveness obtained, etc.
- the amount of the epoxy compound (solid content) is preferably 10 to 90% by mass, and the amount of the blocked isocyanate compound (solid content) is preferably 10 to 90% by mass.
- the solid content (non-volatile components other than the aqueous medium) concentration depends on the processing method and the desired amount of solid content adhering to the fibers. It can be adjusted as appropriate, and is, for example, about 0.1 to 50% by mass, preferably 10 to 30% by mass.
- the content ratio of each component in the solid content contained in the treatment agent 2 can be adjusted as appropriate depending on the type of fiber used, the composition of the rubber composition, the adhesiveness obtained, etc.
- the amount of rubber latex (solid content) having a structure derived from vinylpyridine in the polymer molecule is preferably 70 to 99% by mass.
- the solid content of the polycarboxylic acid polymer is preferably 0.1 to 30% by mass of the total solid content contained in the treatment agent 2. More preferably 0.5 to 20% by weight, still more preferably 1.0 to 15% by weight.
- the solid content of the polymer compound having an oxazoline group is preferably 0.01 to 5.0% by mass of the total solid content contained in the treatment agent 2. More preferably 0.05 to 5.0% by mass, still more preferably 0.1 to 4.0% by mass.
- the processing agent of the present invention and the processing agent 1 and treatment agent 2 of the processing agent kit may contain any additives as long as they produce the effects of the present invention.
- additives include resin components other than the essential components of the present invention, crosslinking agents, surfactants, antioxidants, ultraviolet absorbers, pigments, metal powder pigments, rheology control agents, curing accelerators, plasticizers, Examples include flame retardants, antistatic agents, deodorants, and antibacterial agents.
- the rubber reinforcing fiber of the present invention has a composition containing a polycarboxylic acid polymer, an epoxy compound, a rubber latex having a structure derived from vinylpyridine in the polymer molecule, and a blocked isocyanate compound on the fiber surface.
- An adhesive composition obtained by heat treatment is attached.
- the fiber surface contains a polycarboxylic acid polymer, an epoxy compound, a rubber latex having a structure derived from vinylpyridine in the polymer molecule, and a blocked isocyanate compound.
- an adhesive composition obtained by heat-treating a composition containing a polymer compound having an oxazoline group is attached.
- the "adhesive composition” refers to a composition that contributes to the expression of good adhesiveness between the rubber reinforcing fiber and the rubber composition when it is made into a final rubber product.
- the material itself has tackiness like an adhesive or adhesive.
- rubber latex has a property in which the rubber component is emulsified and dispersed in an aqueous medium, but since the aqueous medium is volatilized and removed in the adhesive composition obtained by heat treatment, the adhesive composition is The rubber latex in the rubber composition does not need to maintain such properties.
- the composition before heat treatment contains polycarboxylic acid polymer particles, the polycarboxylic acid polymer particles must maintain their particle shape in the adhesive composition obtained by heat treatment. There isn't.
- the invention of the rubber reinforcing fiber is specified by the manufacturing method.
- all treatment agents used in the manufacturing process including the treatment agent and treatment agent kit of the present invention, do not contain resorcinol or formaldehyde, and the adhesive composition thereof contains no resorcinol or formaldehyde. , formaldehyde, and components derived therefrom are preferably not contained.
- the fibers used in the rubber reinforcing fibers of the present invention are used in rubber products that require high strength such as tires, power transmission belts, and high-pressure hoses
- the fibers used are cord-like fibers made of twisted organic fibers. It is preferable that there be.
- a shape in which cords are arranged in a mesh shape or a cloth-like shape can be used.
- the material of the organic fiber is not particularly limited, but includes nylon, polyester, aramid (aromatic polyamide), rayon, polyolefin such as polypropylene and polyethylene, polycarbonate, polyacrylate, ABS resin, vinyl chloride resin, and the like.
- the fiber contains either polyester, nylon or aramid, and among these, when using polyester or aramid, which is relatively difficult to adhere to a rubber composition by a normal method, the present invention The effect is more pronounced.
- the fiber used for the rubber reinforcing fiber of the present invention contains aramid
- the additive contained in the treatment agent of the present invention, treatment agent 1, and treatment agent 2 of the treatment agent kit may be disclosed in JP-A-9-21073.
- the rubber reinforcing fiber of the present invention can be produced by applying a processing liquid containing the processing agent of the present invention to the fiber, followed by drying and heat treatment.
- the adhesion treatment method include dipping, brushing, casting, spraying, roll coating, knife coating, etc. Among them, it is preferable to use dipping treatment.
- the temperature during the drying treatment is preferably 60 to 200°C, more preferably 80 to 150°C.
- the drying time is preferably 20 seconds to 10 minutes, more preferably 30 seconds to 5 minutes.
- the temperature during the heat treatment is preferably 100 to 280°C, more preferably 150 to 260°C.
- the heating time is preferably 20 seconds to 10 minutes, more preferably 30 seconds to 5 minutes.
- the device used for the drying treatment or the heat treatment is not particularly limited, and a heating device using warm air, infrared rays, high frequency waves, etc. can be used.
- the adhesive composition produced from the constituent components of the treatment agent of the present invention is adhered to the surface of the fiber.
- the amount of solid content of the adhesive composition attached to the fibers can be adjusted as appropriate depending on the type of fibers used, the composition of the rubber composition, the desired adhesiveness, etc. , the mass percentage of the adhered adhesive composition solid content), for example, 1 to 20% by mass.
- the method for producing rubber reinforcing fibers of the present invention involves first applying a processing liquid containing treatment agent 1 to the fibers, and then processing the fibers containing treatment agent 2. It has a two-step process of applying a liquid. After the process of attaching the machining liquid containing the treatment agent 1 and before the process of attaching the machining liquid containing the treatment agent 2, drying treatment and heat treatment are performed, and the process of attaching the machining liquid containing the treatment agent 2 is performed. It is also preferable to perform a drying treatment and a heating treatment afterwards.
- the methods, equipment, conditions, etc. of the adhesion treatment, drying treatment, and heat treatment are the same as described above.
- the rubber product of the present invention contains the rubber reinforcing fiber of the present invention.
- Such rubber products can be obtained, for example, by embedding the rubber reinforcing fibers of the present invention in unvulcanized rubber, and vulcanizing the unvulcanized rubber to obtain a rubber composition. Excellent adhesion with reinforcing fibers.
- Such rubber products themselves may be final products such as tires, power transmission belts, hoses, and rubber sheets for buildings, or may be made into cord-like or It may also be a sheet-shaped member for reinforcing the final rubber product.
- the rubber component contained in the rubber composition is not particularly limited, and includes, for example, natural rubber (NR), polyisoprene rubber (IR), polybutadiene rubber (BR), styrene-butadiene copolymer rubber (SBR), and acrylonitrile butadiene rubber.
- Conjugated diene synthetic rubbers such as (NBR), chloroprene rubber (CR), butyl rubber (IIR), ethylene-propylene copolymer rubber (EPM), ethylene-propylene-diene copolymer rubber (EPDM), polysiloxane rubber, etc. can be mentioned. These may be used alone or in combination of two or more.
- Examples of the vulcanizing agent used in the vulcanization treatment of unvulcanized rubber include sulfur, thiuram polysulfide compounds such as tetramethylthiuram disulfide and dipentamethylenethiuram tetrasulfide, 4,4-dithiomorpholine, and p-quinonedioxime. , p,p'-dibenzoquinone dioxime, cyclic sulfur imide, peroxide and the like.
- various compounding agents such as fillers such as carbon black, silica, and aluminum hydroxide, colorants, vulcanization accelerators, antiaging agents, and softeners can be appropriately blended into the rubber composition.
- the present disclosure (1) is a rubber reinforcing fiber treatment agent that does not contain resorcinol and formaldehyde, which comprises a polycarboxylic acid polymer, an epoxy compound, and a rubber latex having a structure derived from vinylpyridine in the polymer molecule. , a rubber reinforcing fiber treatment agent containing a blocked isocyanate compound.
- the present disclosure (2) is the rubber reinforcing fiber treatment agent according to the present disclosure (1), which further contains a polymer compound having an oxazoline group.
- the present disclosure (3) provides that the polycarboxylic acid polymer has a crosslinked structure and is included in the polycarboxylic acid polymer particles, or the present disclosure (1) is a polymer that does not have a crosslinked structure. ) or the rubber reinforcing fiber treatment agent described in (2).
- the present disclosure (4) is the fiber treatment agent for rubber reinforcement according to the present disclosure (3), wherein the polycarboxylic acid polymer particles are fine particles having a volume average particle diameter of 10 nm to 10 ⁇ m.
- the present disclosure (5) is a kit for a fiber treatment agent for rubber reinforcement that does not contain resorcinol and formaldehyde, and includes a treatment agent 1 containing an epoxy compound and a blocked isocyanate compound, and a polymer molecule derived from vinylpyridine.
- This is a fiber treatment agent kit for rubber reinforcement, which includes a treatment agent 2 containing a rubber latex having a structure of 1, a polycarboxylic acid polymer, and a polymer compound having an oxazoline group.
- the present disclosure (6) provides that the polycarboxylic acid polymer has a crosslinked structure and is included in the polycarboxylic acid polymer particles, or the present disclosure (5) is a polymer that does not have a crosslinked structure.
- the present disclosure (7) is the rubber reinforcing fiber treatment agent kit according to the present disclosure (6), wherein the polycarboxylic acid polymer particles are fine particles having a volume average particle diameter of 10 nm to 10 ⁇ m.
- the present disclosure (8) uses the rubber reinforcing fiber treatment agent kit according to any one of the present disclosure (5) to (7) to apply a processing liquid containing the treatment agent 1 to the fibers.
- This is a method for producing rubber reinforcing fibers, which includes a step of applying a processing liquid containing the processing agent 2 after that.
- the present disclosure (9) provides heat treatment of a composition containing a polycarboxylic acid polymer, an epoxy compound, a rubber latex having a structure derived from vinylpyridine in the polymer molecule, and a blocked isocyanate compound on the fiber surface. This is a rubber reinforcing fiber to which the adhesive composition obtained is attached.
- the present disclosure (10) provides a polymer having a polycarboxylic acid polymer, an epoxy compound, a rubber latex having a structure derived from vinylpyridine in the polymer molecule, a blocked isocyanate compound, and an oxazoline group on the fiber surface. This is a rubber reinforcing fiber to which an adhesive composition obtained by heat-treating a composition containing a compound is attached.
- the present disclosure (11) provides that the polycarboxylic acid polymer has a crosslinked structure and is included in the polycarboxylic acid polymer particles, or the present disclosure (9) is a polymer that does not have a crosslinked structure. ) or (10).
- the present disclosure (12) is the rubber reinforcing fiber according to (11), wherein the polycarboxylic acid polymer particles are fine particles having a volume average particle diameter of 10 nm to 10 ⁇ m.
- the present disclosure (13) is the rubber reinforcing fiber according to any one of the present disclosure (9) to (12), wherein the fiber includes any one of polyester, nylon, and aramid.
- the present disclosure (14) is a rubber product containing the rubber reinforcing fiber according to any one of the present disclosure (9) to (13).
- DM-6400 MDI type water-dispersed blocked isocyanate, solid content concentration 42%, regenerated isocyanate group (isocyanate group when the blocking agent is removed from water-dispersed blocked isocyanate) concentration 7.90 %, manufactured by Meisei Chemical Industry Co., Ltd., Smectone (registered trademark) -ST: Synthetic smectite, manufactured by Kunimine Industries Co., Ltd., FUJI SP BLACK 203: Carbon black dispersion, solid content concentration 23.5%, manufactured by Fuji Color Co., Ltd.
- ⁇ Measurement conditions for weight average molecular weight of polycarboxylic acid polymer The weight average molecular weight of the polymer was measured using gel permeation chromatography (GPC) under the following conditions.
- ⁇ Measurement of volume average particle diameter of polycarboxylic acid polymer> An aqueous dispersion of polycarboxylic acid polymer particles was diluted with ion-exchanged water so that the concentration of polymer particles was 0.01 to 0.05% by mass, and a light scattering particle size distribution analyzer (Spectris Co., Ltd.) was used. The volume average particle diameter (nm) of the polymer particles was determined by a dynamic light scattering method using "Zetasizer Ultra").
- Production example 4 After further adding triethylamine to the polycarboxylic acid polymer composition of Production Example 1 and adjusting the pH to 7.2, the solid content concentration containing the polycarboxylic acid polymer (4) was adjusted to 41.2. A 7% polycarboxylic acid polymer composition of Production Example 4 was obtained.
- the obtained polycarboxylic acid polymer is a polymer that does not have a crosslinked structure, and no undissolved matter was confirmed in the composition at a liquid temperature of 25°C. Therefore, the polycarboxylic acid polymer (4 ) is water soluble.
- Production Example 1 aqueous ammonia was used instead of triethylamine, the pH was adjusted to 7.2, and then adjusted with pure water to obtain a solid content containing polycarboxylic acid polymer (5) of 45.1%.
- a polycarboxylic acid polymer composition of Production Example 5 was obtained.
- the obtained polycarboxylic acid-based polymer is a polymer that does not have a crosslinked structure, and since no undissolved matter was confirmed in the composition at a liquid temperature of 25°C, the polycarboxylic acid-based polymer (5 ) is water soluble.
- Manufacturing example 6 Add monoethanolamine and diethanolamine to an aqueous solution of acrylic acid-maleic acid copolymer having a weight average molecular weight of 10,000 to adjust the pH to 7.2, and then adjust with pure water to obtain a polycarboxylic acid polymer (6).
- a polycarboxylic acid polymer composition of Production Example 6 having a solid content concentration of 36.7% was obtained.
- the obtained polycarboxylic acid polymer is a polymer that does not have a crosslinked structure, and no undissolved matter was confirmed in the composition at a liquid temperature of 25°C. Therefore, the polycarboxylic acid polymer (6 ) is water soluble.
- Manufacturing example 7 Polycarboxylic acid polymer particles (manufactured by Nippon Shokubai Co., Ltd. RX- A polycarboxylic acid-based polymer composition of Production Example 7 containing 6-AQ-WA-2210) and having a solid content concentration of 16.6% was obtained.
- the particles had a uniform composition throughout, had a volume average particle diameter of 397 nm, and maintained their particle shape in an aqueous dispersion at a liquid temperature of 25°C.
- Production example 8 An acrylic polymer (not applicable to the polycarboxylic acid polymer in the present invention) that does not have a crosslinked structure as a core portion, a polycarboxylic acid polymer (7) that has a crosslinked structure as a shell portion ( ⁇ -hydroxymethyl acrylic Production of polycarboxylic acid polymer particles (RX-6-AQ-WA-11210 manufactured by Nippon Shokubai Co., Ltd.) with a solid content concentration of 12.9% (hydrolyzate of divinylbenzene copolymer) A polycarboxylic acid polymer composition of Example 8 was obtained. The obtained polycarboxylic acid polymer particles had a crosslinked structure in the shell portion, had an average particle diameter of 450 nm, and maintained their particle shape in an aqueous dispersion at a liquid temperature of 25°C.
- Production example 9 An acrylic polymer having a crosslinked structure as a core portion (not applicable to the polycarboxylic acid polymer in the present invention), a polycarboxylic acid polymer (7) having a crosslinked structure as a shell portion ( ⁇ -hydroxymethylacrylic acid) Production example of a solid content concentration of 18.1% containing polycarboxylic acid polymer particles (RX-6-AQ-WA-51310 manufactured by Nippon Shokubai Co., Ltd.) consisting of a hydrolyzate of methyl-divinylbenzene copolymer) A polycarboxylic acid polymer composition No. 9 was obtained. The polycarboxylic acid polymer particles had a crosslinked structure in the core and shell, had an average particle diameter of 349 nm, and maintained their particle shape in an aqueous dispersion at a liquid temperature of 25°C.
- Example 1-1 11.6 parts of Denacol EX-313 was added to 582.3 parts of water and uniformly dissolved. Next, 36.3 parts (solid content: 19.6 parts) of the water-dispersed blocked isocyanate of Production Example 10 was added and mixed uniformly. Next, 360.8 parts of PYRATEX-LB (solid content: 140.0 parts) was added and mixed uniformly. Next, 7.17 parts (solid content: 3.8 parts) of the polycarboxylic acid polymer composition of Production Example 1 was added and mixed uniformly. Finally, 1.80 parts of Epocross K-2035E (solid content 0.56 parts) was slowly added while stirring and mixed uniformly. obtained the drug.
- PYRATEX-LB solid content: 140.0 parts
- Example 1-1 Using the rubber reinforcing fiber treatment agent of Example 1-1 thus obtained as it is as a processing liquid, fibers (polyester cord, HL thread, 1670 dtex, double twisted) were immersed and dried at 130°C for 2 minutes. The fibers were then heat treated at 240° C. for 2 minutes to obtain the rubber reinforcing fibers of Example 1-1 in which the adhesive composition was adhered to the fiber surfaces. The amount of solid content of the adhesive composition adhered to the fiber was 10.4% in terms of adhesion rate (ratio of the mass of the adhered adhesive composition solid content to the mass of the fiber before treatment).
- Examples 1-2 to 1-14, Comparative Examples 1-1 to 1-4 Change the raw materials and fibers (polyester cord is written as "PET", nylon cord (1400 dtex, double stranded) is written as "Ny”) used for the fiber treatment agent for rubber reinforcement to those and amounts listed in Tables 1 and 2. Except for the above, rubber reinforcing fiber processing agents and rubber reinforcing fibers of Examples 1-2 to 1-14 and Comparative Examples 1-1 to 1-4 were obtained in the same manner as in Example 1-1.
- Reference example 1 Add 300.7 parts of PYRATEX-LB (solid content 116.7 parts) and 125.0 parts of Nipol LX-112 (solid content 51.3 parts) to 384.7 parts of water and mix uniformly to dilute the latex. It was made into a liquid. Separately, 7.0 parts of 10% sodium hydroxide aqueous solution was added to 126.5 parts of water, mixed, 45.0 parts of Sumikanol 700S (solid content 29.3 parts) was added, and the resorcinol was uniformly dissolved. - A formaldehyde initial condensate solution was prepared.
- the resorcinol-formaldehyde initial condensate solution was added to the latex diluted solution while stirring slowly, and 11.1 parts of formalin (37% aqueous solution) was added, mixed uniformly, and the solid content was 20.0%.
- a fiber treatment agent for rubber reinforcement was obtained.
- fibers nylon cord, 1400 dtex, double-stranded
- fibers were immersed, dried at 130°C for 2 minutes, and then heated at 240°C for 2 minutes.
- the amount of solid content of the adhesive composition adhered to the fibers was 7.2% in terms of adhesion rate.
- Adhesive Strength For each obtained rubber product, using a precision universal testing machine (Autograph (registered trademark) AG-X, manufactured by Shimadzu Corporation), use a flat grip to leave the cords at both ends. Five cords were held and peeled at a rate of 300 mm/min in a direction 90 degrees to the rubber sheet surface, and the force required at that time was measured. The value obtained by dividing the measured value by 5 (force per cord) was defined as the adhesive force. Adhesive force of 17N or more can be used for practical purposes. The results are shown in Tables 1 and 2.
- heat-resistant rubber adhesion amount was evaluated in the same manner as in the above evaluation of rubber adhesion amount, except that the surface of the rubber reinforcing fibers peeled from the rubber sheet was visually observed. was evaluated.
- the heat-resistant rubber adhesion amount can be put to practical use if it is one of " ⁇ ", " ⁇ ", and " ⁇ ". The results are shown in Table 3.
- Example 2-1 13.3 parts of Denacol EX-614 and 0.7 parts of Neocol P were added to 973.6 parts of water and uniformly dissolved.
- 12.4 parts (solid content: 6.7 parts) of the water-dispersed blocked isocyanate of Production Example 10 was added and mixed uniformly to obtain Treatment Agent 1 with a solid content concentration of 2.07%.
- 484.5 parts of PYRATEX-LB solid content: 188.3 parts was added to 484.3 parts of water and mixed uniformly.
- 23.72 parts (solid content: 9.7 parts) of the polycarboxylic acid polymer composition of Production Example 3 was added and mixed uniformly.
- Examples 2-2 to 2-8, Comparative Example 2-1 Each of 2-2 to 2-8 and Comparative Example 2-1 was prepared in the same manner as in Example 2-1, except that the raw materials used for the rubber reinforcing fiber treatment agent were changed to those and amounts listed in Table 4. A rubber reinforcing fiber treatment agent kit and rubber reinforcing fibers were obtained. All fibers used were polyester cords.
- Reference example 2 13.3 parts of Denacol EX-614 and 0.7 parts of Neocol P were added to 973.6 parts of water and uniformly dissolved. Next, 12.4 parts (solid content 6.7 parts) of the water-dispersed blocked isocyanate of Production Example 10 was added and mixed uniformly to obtain a pretreatment agent with a solid content concentration of 2.07%. Separately, 300.7 parts of PYRATEX-LB (solid content: 116.7 parts) and 125.0 parts of Nipole LX-112 (solid content: 51.3 parts) were added to 384.7 parts of water. The mixture was mixed to form a diluted latex solution.
- Example 2 Separately, 7.0 parts of 10% sodium hydroxide aqueous solution was added to 126.5 parts of water, mixed, 45.0 parts of Sumikanol 700S (solid content 29.3 parts) was added, and the resorcinol was uniformly dissolved. - A formaldehyde initial condensate solution was prepared. Next, the resorcinol-formaldehyde initial condensate solution was added to the latex diluted solution while stirring slowly, and 11.1 parts of formalin (37% aqueous solution) was added, mixed uniformly, and the solid content was 20.0%. A post-treatment agent was obtained. The obtained pre-treatment agent and post-treatment agent were used to prepare a rubber-reinforcing fiber treatment agent kit of Reference Example 2. The processing conditions for polyester cord were the same as in Example 2-1 (using a pre-treatment agent in place of treatment agent 1 and a post-treatment agent in place of treatment agent 2) to obtain rubber reinforcing fibers. .
- Examples 2-9, 2-10, Reference Examples 3 and 4 Examples 2-9, 2-10, and Reference Example were prepared in the same manner as in Example 2-1 or Reference Example 2, except that the raw materials used for the fiber treatment agent for rubber reinforcement were changed to those and amounts listed in Table 6. Rubber reinforcing fiber treatment agent kits and rubber reinforcing fibers of Nos. 3 and 4 were obtained.
- the fiber used was an aramid cord (1110 dtex, double-stranded, indicated as "Ara" in the table).
- rubber products containing rubber reinforcing fibers obtained using these polymer particles have a high adhesive strength between the rubber reinforcing fibers and the rubber composition in high-temperature environments. It can be seen that there is a large amount of rubber adhesion, which reflects the toughness of the interface between the rubber reinforcing fiber and the rubber composition.
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Abstract
Description
本発明の処理剤は、更に、オキサゾリン基を有する高分子化合物を含有することが好ましい。
本発明の処理剤が含有するポリカルボン酸系重合体は、架橋構造を有し、ポリカルボン酸系重合体粒子に含まれるものであるか、架橋構造を有しない重合体であることが好ましい。上記ポリカルボン酸系重合体粒子は、体積平均粒子径が10nm~10μmの微粒子であることが好ましい。
本発明の処理剤を用いた繊維表面の付着処理によりゴム補強用繊維を得ることができる。
本発明のゴム補強用繊維処理剤キット(以下、「本発明の処理剤キット」とも言う。)は、エポキシ化合物と、ブロックイソシアネート化合物とを含有する処理剤1、及び、ポリマー分子中にビニルピリジンに由来する構造を有するゴムラテックスと、ポリカルボン酸系重合体と、オキサゾリン基を有する高分子化合物を含有する処理剤2を含み、レゾルシン及びホルムアルデヒドを含まない。
処理剤2が含有するポリカルボン酸系重合体は、架橋構造を有し、ポリカルボン酸系重合体粒子に含まれるものであるか、架橋構造を有しない重合体であることが好ましい。上記ポリカルボン酸系重合体粒子は、体積平均粒子径が10nm~10μmの微粒子であることが好ましい。
処理剤1及び2は、それぞれさらに液状媒体を含有することが好ましい。
レゾルシン、ホルムアルデヒド及びレゾルシンとホルムアルデヒドを縮合させたレゾルシン・ホルムアルデヒド初期縮合物を実質的に含まない処理剤及び処理剤キットは、レゾルシン、ホルムアルデヒド及びレゾルシン・ホルムアルデヒド初期縮合物を実質的に含まない、又は、製造工程において生じない原材料を使用することにより、製造することができる。
本発明で使用するポリカルボン酸系重合体とは、不飽和カルボン酸系単量体に由来する構造単位を含む重合体である。
不飽和カルボン酸系単量体とは、カルボキシ基(-COOH)、その塩又は、カルボン酸無水物基(-CO-O-CO-)と、重合性の炭素-炭素二重結合とを含む単量体であり、本発明においては、不飽和カルボン酸、その塩及び不飽和カルボン酸無水物を指す。具体的には、アクリル酸、メタクリル酸、クロトン酸、α-ヒドロキシアクリル酸、α-ヒドロキシメチルアクリル酸等の、不飽和モノカルボン酸及びこれらの塩;フマル酸、マレイン酸、メチレングルタル酸、イタコン酸等の不飽和ジカルボン酸及びこれらの塩(一塩であっても二塩であっても良い);無水マレイン酸やイタコン酸無水物等の不飽和カルボン酸無水物;等が例示される。
上記塩としては、金属塩、アンモニウム塩、有機アミン塩が例示される。金属塩としては、ナトリウム、カリウム等のアルカリ金属;カルシウム、マグネシウム等のアルカリ土類金属;鉄、アルミニウム等の遷移金属;等との塩が例示される。有機アミン塩としては、メチルアミン、n-ブチルアミン、ジエチルアミン、トリエチルアミン等のアルキルアミン;モノエタノールアミン、ジエタノールアミン、トリエタノールアミン、ジプロパノールアミン等のアルカノールアミン;エチレンジアミン、ジエチレントリアミン等のポリアミン;等との塩が例示される。アンモニウム塩は、アンモニアとの塩である。
なお、本発明において、不飽和カルボン酸系単量体に由来する構造単位と同じ構造を有していれば、不飽和カルボン酸系単量体を重合する以外の方法で形成した構造単位も不飽和カルボン酸系単量体に由来する構造単位に含まれる。本発明で使用するポリカルボン酸系重合体は、不飽和カルボン酸系単量体に由来する構造単位を、1種含んでいても、2種以上含んでいても良い。
上記ポリカルボン酸系重合体は、カルボキシ基及び/又はその塩を1分子中に合計2個以上含むか、カルボン酸無水物基を1分子中に2個以上含むものであればよい。
その他の単量体としては、特に制限はないが、具体的には、3-アリルオキシ-2-ヒドロキシプロパンスルホン酸、(メタ)アリルスルホン酸、イソプレンスルホン酸、ビニルスルホン酸、スチレンスルホン酸及びこれらの塩等のスルホン酸系単量体;ビニルピリジン、ビニルイミダゾール、ジメチルアミノエチル(メタ)アクリレート、ジメチルアミノプロピルアクリレート、アミノエチルメタクリレート、ジアリルアミン、ジアリルジメチルアミン、およびこれらの4級化物や塩等のアミノ基含有単量体;(メタ)アクリロニトリル等の窒素原子含有単量体;N-ビニルピロリドン、N-ビニルホルムアミド、N-ビニルアセトアミド、N-ビニル-N-メチルホルムアミド、N-ビニル-N-メチルアセトアミド、N-ビニルオキサゾリドン等のN-ビニル単量体;(メタ)アクリルアミド、N,N-ジメチル(メタ)アクリルアミド、N-イソプロピル(メタ)アクリルアミド、ジメチルアミノエチル(メタ)アクリルアミド等のアミド系単量体;3-(メタ)アリルオキシ-1,2-ジヒドロキシプロパン、(メタ)アリルアルコール、イソプレノール等の不飽和アルコール系単量体;上記不飽和アルコール系単量体にアルキレンオキシドを付加した構造を有するポリアルキレングリコール系単量体;メチル(メタ)アクリレート、エチル(メタ)アクリレート、n-プロピル(メタ)アクリレート、イソプロピル(メタ)アクリレート、ブチル(メタ)アクリレート、2-エチルヘキシル(メタ)アクリレート、ドデシル(メタ)アクリレート等の(メタ)アクリル酸アルキルエステル系単量体[中でも、(メタ)アクリル酸C1-10アルキルエステルが好ましく、(メタ)アクリル酸C1-5アルキルエステルがより好ましい];2-ヒドロキシエチル(メタ)アクリレート、2-ヒドロキシプロピル(メタ)アクリレート、3-ヒドロキシプロピル(メタ)アクリレート、2-ヒドロキシブチル(メタ)アクリレート、4-ヒドロキシブチル(メタ)アクリレート等の(メタ)アクリル酸ヒドロキシアルキルエステル[中でも、(メタ)アクリル酸C1-8ヒドロキシアルキルエステルが好ましく、(メタ)アクリル酸C1-4ヒドロキシアルキルエステルがより好ましい。];エチレングリコールジメタクリレート、ジエチレングリコールジメタクリレート、トリエチレングリコールジメタクリレート、テトラエチレングリコールジメタクリレート、ポリエチレングリコールジメタクリレート、1,3-ブタンジオールジメタクリレート、1,4-ブタンジオールジメタクリレート、1,6-ヘキサンジオールジメタクリレート、1,9-ノナンジオールジメタクリレート、ネオペンチルグリコールジメタクリレート、ジプロピレングリコールジメタクリレート、ポリプロピレングリコールジメタクリレート、トリメチロールプロパントリメタクリレート、ペンタエリトリトールトリメタクリレート、ペンタエリトリトールテトラメタクリレート、ジペンタエリトリトールヘキサメタクリレート等の多価メタクリル酸エステル類;(メタ)アリルグリシジルエーテル、(メタ)アクリル酸グリシジル等の不飽和グリシジル化合物;1-アリロキシ-3-ブトキシプロパン-2-オール等の、不飽和グリシジル化合物にアルコールを付加させた構造を有する単量体;ジビニルエーテル;ジアルキレングリコールジアリルエーテル(ジエチレングリコールジアリルエーテル、ジプロピレングリコールジアリルエーテル、ジブチレングリコールジアリルエーテル等)、ポリアルキレングリコールジアリルエーテル(ポリエチレングリコールジアリルエーテル、ポリプロピレングリコールジアリルエーテル、ポリブチレングリコールジアリルエーテル等)等のジアリルエーテル類;スチレン、アルキルスチレン類(o-メチルスチレン、m-メチルスチレン、p-メチルスチレン、α-メチルスチレン、エチルビニルベンゼン、p-t-ブチルスチレン等)、ハロゲン基含有スチレン類(o-クロロスチレン、m-クロロスチレン、p-クロロスチレン等)、ジビニルベンゼン、トリビニルベンゼン、ジビニルナフタレン、インデン、ビニルアニリン等のビニルアリール単量体;イソブチレン、1,3-ブタジエン、オクテン、トリビニルシクロヘキサン等のアルケニル基含有炭化水素類;酢酸ビニル、プロピオン酸ビニル等のカルボン酸ビニル類(中でも、飽和脂肪酸とビニルアルコールとのエステルが好ましく、炭素数1~5の飽和脂肪酸とビニルアルコールとのエステルがより好ましい);アルコキシシリル基含有シランカップリング剤[ビニルトリメトキシシラン、ビニルトリエトキシシラン、ビニルトリ(メトキシエトキシ)シラン、γ-(メタ)アクリロイルオキシプロピルトリメトキシシラン、2-スチリルエチルトリメトキシシラン等]、ハロゲン化シリル基含有シランカップリング剤[ビニルトリクロロシラン等]、シラノール基含有シランカップリング剤[γ-(メタ)アクリロイルオキシプロピルヒドロキシシラン、γ-(メタ)アクリロイルオキシプロピルメチルヒドロキシシラン等]、メタクリル変性ポリジメチルシロキサン等のケイ素原子含有単量体;等が挙げられる。また、上記他の単量体は、1種を単独で使用してもあるいは2種以上を併用しても良い。
上記ポリカルボン酸系重合体が架橋構造を有しない重合体である場合、不飽和カルボン酸系単量体に由来する構造単位とその他の単量体に由来する構造単位の合計100モル%に対して、アクリル酸もしくはアクリル酸塩に由来する構造単位を50モル%以上100モル%以下含むことが好ましく、70モル%以上100モル%以下含むことがより好ましく、90モル%以上100モル%以下含むことがさらに好ましい。上記範囲であることにより、ゴム補強用繊維処理剤の配合安定性が向上する傾向にある。アクリル酸塩における塩とは、上記塩と同様の塩が例示される。アクリル酸もしくはアクリル酸塩に由来する構造単位は、アクリル酸に由来する構造単位かアクリル酸塩に由来する構造単位のいずれかのみを含んでも良く、両方を含んでも良く、アクリル酸塩に由来する構造単位を1種又は2種以上含んでも良い。
重合体の水溶液のpHは3.5~10.0であることが好ましく、5.0~9.5であることがより好ましく、6.0~9.0であることがさらに好ましい。上記範囲であることにより、ゴム補強用繊維処理剤の配合安定性が向上する傾向にある。なお、pHはガラス電極法により測定した値である。
なお、上記カルボキシ基の塩における「塩」とは、上記不飽和カルボン酸系単量体における塩と同様の塩が例示される。
上記ポリカルボン酸系重合体は、不飽和カルボン酸系単量体に由来する構造単位とその他の単量体に由来する構造単位の合計100モル%に対して、不飽和カルボン酸の金属塩に由来する構造単位と不飽和カルボン酸の有機アミン塩と不飽和カルボン酸のアンモニウム塩に由来する構造単位とを合計で、50モル%以上100モル%以下含むことが好ましく、70モル%以上100モル%以下含むことがより好ましく、90モル%以上100モル%以下含むことがさらに好ましい。不飽和カルボン酸の金属塩に由来する構造単位および/又は不飽和カルボン酸の有機アミン塩および/又は不飽和カルボン酸のアンモニウム塩に由来する構造単位はいずれかを1種もしくは2種以上含んでいても良く、それぞれを1種もしくは2種以上含んでいても良い。不飽和カルボン酸の有機アミン塩に由来する構造単位を含むことがより好ましい。上記範囲であることにより、ゴム補強用繊維処理剤の配合安定性が向上する傾向にある。
なお、架橋構造を有するポリカルボン酸系重合体粒子は、水不溶性・水分散性の微粒子であるため、ポリカルボン酸系重合体の分子量を測定することができない。ここで、水不溶性とは、液温25℃の水中で、固形分が20%以下の濃度で、ポリカルボン酸系重合体粒子が粒子形状を保持できることを意味する。
コアシェル粒子におけるシェル部の含有割合は、コアシェル粒子100質量%中、10質量%以上が好ましく、20質量%以上がより好ましく、30質量%以上がさらに好ましく、50質量%以上が特に好ましい。
ポリカルボン酸系重合体粒子は、少なくとも表面層がポリカルボン酸系重合体を含むことが好ましい。コアシェル粒子の場合は、少なくともシェル部がポリカルボン酸系重合体を含むことが好ましい。シェル部が複数の層を有する場合は、少なくともその最外層(粒子の表面側に位置する層)がポリカルボン酸系重合体を含むことが好ましい。
コアシェル粒子の場合は、シェル部におけるポリカルボン酸系重合体の含有割合は、シェル部100質量%中、50質量%以上が好ましく、60質量%がより好ましく、80質量%がさらに好ましく、90質量%が特に好ましい。
本発明において、体積平均粒子径は、動的光散乱粒度分布測定装置を用いて粒子分散液の粒度分布を測定し、ガウシアン分布に基づく解析により求めた値である。
また、加水分解によりカルボキシ基を生成し得る重合性単量体を必須とする単量体成分を重合する工程、及び、それにより得られた重合体の前駆体を加水分解する工程を含む方法で製造することもできる。この方法でポリカルボン酸系重合体粒子を製造する場合は、重合工程において重合体の前駆体を含有する粒子を製造した後、加水分解を行えばよい。
重合工程における重合方法は、特に限定されないが、例えば、溶液重合法、バルク重合、懸濁重合法、逆相懸濁重合法、或いは注型重合法、薄膜重合法、噴霧重合法等を採用することができる。ポリカルボン酸系重合体粒子を製造する場合、従来公知の樹脂粒子の製造方法、例えば懸濁重合法や乳化重合法を採用することができる。それ以外の場合は、溶液重合法が好ましい。また、上記重合工程は、回分式でも連続式でも行うことができる。
不飽和カルボン酸エステルとしては、上記不飽和カルボン酸のエステル(上記不飽和モノカルボン酸のエステル、上記不飽和ジカルボン酸のモノエステル及びジエステル)等が挙げられる。前述のその他の単量体として挙げたものを使用してもよい。例えば、アクリル酸、メタクリル酸、クロトン酸、α-ヒドロキシアクリル酸、α-ヒドロキシメチルアクリル酸等の不飽和モノカルボン酸のエステル;フマル酸、マレイン酸、メチレングルタル酸、イタコン酸等の不飽和ジカルボン酸のエステル(モノエステル、ジエステル);等が例示される。より具体的には、メチル(メタ)アクリレート、エチル(メタ)アクリレート、n-プロピル(メタ)アクリレート、イソプロピル(メタ)アクリレート、n-ブチル(メタ)アクリレート、イソブチル(メタ)アクリレート、t-ブチル(メタ)アクリレート、2-エチルヘキシル(メタ)アクリレート、ドデシル(メタ)アクリレート等の(メタ)アクリル酸アルキルエステル;ジメチルアミノエチル(メタ)アクリレート等のアミノ基含有(メタ)アクリレート;2-ヒドロキシエチル(メタ)アクリレート、2-ヒドロキシプロピル(メタ)アクリレート、3-ヒドロキシプロピル(メタ)アクリレート、2-ヒドロキシブチル(メタ)アクリレート、4-ヒドロキシブチル(メタ)アクリレート等の(メタ)アクリル酸ヒドロキシアルキルエステル;(メタ)アクリル酸グリシジル;多価メタクリル酸エステル類;γ-(メタ)アクリロイルオキシプロピルトリメトキシシラン、γ-(メタ)アクリロイルオキシプロピルヒドロキシシラン、γ-(メタ)アクリロイルオキシプロピルメチルヒドロキシシラン、メタクリル変性ポリジメチルシロキサン等のケイ素原子含有単量体;等が例示される。
不飽和カルボン酸無水物としては、前述の無水マレイン酸やイタコン酸無水物等が例示される。
これらの中でも、得られる重合体が加水分解されやすいことから、上記不飽和カルボン酸のアルキルエステル[不飽和モノカルボン酸のアルキルエステル、不飽和ジカルボン酸のアルキルエステル(モノアルキルエステル及びジアルキルエステル)]及び不飽和カルボン酸無水物が好ましく、上記不飽和カルボン酸の炭素数1~10のアルキルエステルがより好ましく、上記不飽和カルボン酸の炭素数1~5のアルキルエステルがさらに好ましく、上記不飽和カルボン酸の炭素数1~4のアルキルエステルがさらにより好ましく、上記不飽和カルボン酸の炭素数1又は2のアルキルエステルがいっそう好ましく、上記不飽和カルボン酸の炭素数1のアルキルエステルが特に好ましい。
また、同様の理由から、α-ヒドロキシアクリル酸、α-ヒドロキシメチルアクリル酸等のように分子内に水酸基等の親水性基を有する不飽和カルボン酸のエステルも好ましい。
ポリカルボン酸系重合体粒子におけるポリカルボン酸系重合体の具体例としては、(メタ)アクリル酸-エチレングリコールジメタクリレート共重合体、(メタ)アクリル酸-トリエチレングリコールジメタクリレート共重合体、(メタ)アクリル酸-トリメチロールプロパントリメタクリレート共重合体、(メタ)アクリル酸-ポリエチレングリコールジアリルエーテル共重合体、(メタ)アクリル酸-ジビニルベンゼン共重合体、メチルアクリレート-エチレングリコールジメタクリレート共重合体の加水分解物、メチルアクリレート-トリエチレングリコールジメタクリレート共重合体の加水分解物、メチルアクリレート-ポリエチレングリコールジアリルエーテル共重合体の加水分解物、メチルアクリレート-ジビニルベンゼン共重合体の加水分解物、α-ヒドロキシアクリル酸メチル-トリメチロールプロパントリメタクリレート共重合体の加水分解物、α-ヒドロキシメチルアクリル酸メチル-ジビニルベンゼン共重合体の加水分解物、等が例示される。
ポリカルボン酸系重合体粒子がコアシェル粒子である場合は、シェル部の最外層に前述のポリカルボン酸系重合体を含むことが好ましい。コア部を構成する重合体は特に制限されず、ポリメチルメタクリレート、ポリブチルアクリレート、ポリスチレン、メタクリル酸-スチレン共重合体、メタクリル酸-ブチルアクリレート共重合体等が挙げられる。
連鎖移動剤の使用量としては、単量体(全単量体)の使用量1モルに対して、0g以上、20g以下であることが好ましく、0g以上、15g以下であることがより好ましく、1g以上、7g以下であることがさらに好ましい。
溶媒の使用量としては、単量体100質量%に対して40~400質量%が好ましい。より好ましくは、45質量%以上であり、更に好ましくは、50質量%以上である。また、より好ましくは、350質量%以下であり、更に好ましくは、300質量%以下である。溶媒の使用量が40質量%未満であると、得られる重合体の分子量が高くなるおそれがあり、400質量%を超えると、得られる重合体の濃度が低くなり、保管等のコストが高額になるおそれがある。
一方、架橋構造を有するポリカルボン酸系重合体や架橋構造を有するポリカルボン酸系重合体粒子は、水不溶性の微粒子である。
エポキシ化合物としては、エチレングリコールグリシジルエーテル、グリセロールポリグリシジルエーテル、ジグリセロールポリグリシジルエーテル、ソルビトールポリグリシジルエーテル、ポリグリセロールポリグリシジルエーテル、ビスフェノールAジグリシジルエーテル、ビスフェノールSジグリシジルエーテル、ノボラックグリシジルエーテル、ブロム化ビスフェノールAジグリシジルエーテル等のグリシジルエーテル;ヘキサヒドロフタル酸グリシジルエステル、ダイマー酸グリシジルエステル等のグリシジルエステル;トリグリシジルイソシアヌレート、グリシジルヒダントイン、テトラグリシジルジアミノジフェニルメタン、トリグリシジルパラアミノフェノール、トリグリシジルメタアミノフェノール、ジグリシジルアニリン、ジグリシジルトルイジン、テトラグリシジルメタキシレンジアミン、ジグリシジルトリブロムアニリン、テトラグリシジルビスアミノメチルシクロヘキサン等のグリシジルアミン;3,4-エポキシシクロヘキシルメチルカルボキシレート、エポキシ化ポリブタジエン、エポキシ化大豆油等の脂環族あるいは脂肪族エポキサイド等、が挙げられる(本発明で使用するポリカルボン酸系重合体を除く)。これらの中では、水性媒体への溶解性が良好な化合物である、エチレングリコールグリシジルエーテル、グリセロールポリグリシジルエーテル、ジグリセロールポリグリシジルエーテル、ソルビトールポリグリシジルエーテル、ポリグリセロールポリグリシジルエーテルが好ましく、市販品としては、ナガセケムテックス株式会社製のデナコール(登録商標)シリーズなどを好ましく用いることができる。また、これらは1種のみを用いてもよいし、2種以上を併用してもよい。
ポリマー分子中にビニルピリジンに由来する構造を有するゴムラテックスは、ポリマー分子中にビニルピリジンに由来する構造を有するゴム成分(本発明で使用するポリカルボン酸系重合体及びエポキシ化合物を除く)が水性媒体中で乳化分散した性状を有するものである。
ブロックイソシアネート化合物は、分子中にブロックイソシアネート基を有する化合物であり(本発明で使用するポリカルボン酸系重合体、エポキシ化合物及びポリマー分子中にビニルピリジンに由来する構造を有するゴム成分を除く)、例えば、公知のポリイソシアネート化合物のイソシアネート基に公知のブロック化剤を付加反応させることで得られる。具体的には、例えば以下の原料成分(a)、(b)、及び、必要に応じて(c)を反応させることにより合成することができる。
(a)ポリイソシアネート化合物
(b)ブロック化剤
(c)活性水素基含有化合物(ただし、上記の成分(a)及び(b)は除く)
該ブロックイソシアネート化合物は、分子中に複数のブロックイソシアネート基を有することが好ましい。
(a)ポリイソシアネート化合物(以下、「ポリイソシアネート化合物(a)」と言う。)
ポリイソシアネート化合物(a)としては、特に限定はなく、例えば、芳香族ポリイソシアネート、芳香脂肪族ポリイソシアネート、脂肪族ポリイソシアネート、脂環族ポリイソシアネート、これらのポリイソシアネートの誘導体を含むポリイソシアネート誘導体などが挙げられる。
ブロック化剤とは、付加反応によりイソシアネート基に付加することによりイソシアネート基を不活性化(保護)してブロックイソシアネート基を形成し、一方、加熱などによってブロックイソシアネート基から脱離(脱保護)することにより、イソシアネート基を再形成し、反応活性を再生させる機能を有する化合物のことである。ブロック化剤(b)としては、例えば、アルコール系化合物、アルキルフェノール系化合物、フェノール系化合物、活性メチレン系化合物、メルカプタン系化合物、酸アミド系化合物、酸イミド系化合物、イミダゾール系化合物、イミダゾリン系化合物、ピリミジン系化合物、グアニジン系化合物、トリアゾール系化合物、カルバミン酸系化合物、尿素系化合物、オキシム系化合物、アミン系化合物、イミド系化合物、イミン系化合物、ピラゾール系化合物、重亜硫酸塩等が挙げられる。中でも、酸アミド系化合物、活性メチレン系化合物、オキシム系化合物、ピラゾール系化合物が好ましく、ε-カプロラクタム、アセチルアセトン、マロン酸ジエチル、メチルエチルケトンオキシム、シクロヘキサノンオキシム、3-メチルピラゾール、3,5-ジメチルピラゾール等がより好ましい。ブロック化剤(b)は、1種のみを用いてもよいし、2種以上を併用してもよい。
活性水素基含有化合物(c)としては、特に限定はなく、活性水素基を含有する各種アルコール類、ポリオール類、アミン類が挙げられる。
また、水分散型ブロックイソシアネートには、必要により、分散剤、消泡剤などの添加剤を適宜添加することができる。
また、ブロックイソシアネート化合物は、1種のみを用いてもよいし、2種以上を併用してもよい。
本発明の処理剤キットは、オキサゾリン基を有する高分子化合物を含有する。本発明の処理剤においても、ポリカルボン酸系重合体と、エポキシ化合物と、ポリマー分子中にビニルピリジンに由来する構造を有するゴムラテックスと、ブロックイソシアネート化合物に加えて、更に、オキサゾリン基を有する高分子化合物を含有することが好ましい。
オキサゾリン基を有する高分子化合物は、高分子鎖の側鎖にオキサゾリン基を有する化合物である(本発明で使用するポリカルボン酸系重合体、エポキシ化合物、ポリマー分子中にビニルピリジンに由来する構造を有するゴム成分、及び、ブロックイソシアネート化合物を除く)。該化合物は、オキサゾリン基の反応性を利用する架橋剤として作用する。高分子鎖としては、アクリル系重合体やスチレン-アクリル系共重合体や、更にポリアルキレンオキサイドの構造がグラフト重合された共重合体等が挙げられ、数平均分子量は5千~30万程度であることが好ましい。オキサゾリン基を有する高分子化合物としては市販や公知のものを好ましく用いることができ、市販品としては株式会社日本触媒製のエポクロス(登録商標)シリーズが挙げられる。
また、本発明のゴム補強用繊維は、本発明の処理剤や処理剤キットも含めて、その製造過程に用いるすべての処理剤がレゾルシン及びホルムアルデヒドを含まず、それが有する接着性組成物がレゾルシン、ホルムアルデヒド及びこれらに由来する成分を含有しないことが好ましい。
本開示(1)は、レゾルシン及びホルムアルデヒドを含まないゴム補強用繊維処理剤であって、ポリカルボン酸系重合体と、エポキシ化合物と、ポリマー分子中にビニルピリジンに由来する構造を有するゴムラテックスと、ブロックイソシアネート化合物を含有するゴム補強用繊維処理剤である。
本開示(2)は、更に、オキサゾリン基を有する高分子化合物を含有する本開示(1)に記載のゴム補強用繊維処理剤である。
本開示(3)は、前記ポリカルボン酸系重合体が、架橋構造を有し、ポリカルボン酸系重合体粒子に含まれるものであるか、架橋構造を有しない重合体である本開示(1)又は(2)に記載のゴム補強用繊維処理剤である。
本開示(4)は、前記ポリカルボン酸系重合体粒子が、体積平均粒子径が10nm~10μmの微粒子である本開示(3)に記載のゴム補強用繊維処理剤である。
本開示(6)は、前記ポリカルボン酸系重合体が、架橋構造を有し、ポリカルボン酸系重合体粒子に含まれるものであるか、架橋構造を有しない重合体である本開示(5)に記載のゴム補強用繊維処理剤キットである。
本開示(7)は、前記ポリカルボン酸系重合体粒子が、体積平均粒子径が10nm~10μmの微粒子である本開示(6)に記載のゴム補強用繊維処理剤キットである。
本開示(10)は、繊維表面に、ポリカルボン酸系重合体と、エポキシ化合物と、ポリマー分子中にビニルピリジンに由来する構造を有するゴムラテックスと、ブロックイソシアネート化合物と、オキサゾリン基を有する高分子化合物を含有する組成物を加熱処理して得た接着性組成物が付着したゴム補強用繊維である。
本開示(11)は、前記ポリカルボン酸系重合体が、架橋構造を有し、ポリカルボン酸系重合体粒子に含まれるものであるか、架橋構造を有しない重合体である本開示(9)又は(10)に記載のゴム補強用繊維である。
本開示(12)は、前記ポリカルボン酸系重合体粒子が、体積平均粒子径が10nm~10μmの微粒子である(11)に記載のゴム補強用繊維である。
本開示(13)は、前記繊維が、ポリエステル、ナイロン及びアラミドのいずれかを含む本開示(9)~(12)のいずれかに記載のゴム補強用繊維である。
・デナコール(登録商標)EX-313:グリセロールポリグリシジルエーテル、エポキシ当量141g/eq、ナガセケムテックス株式会社製
・デナコール(登録商標)EX-614:ソルビトールポリグリシジルエーテル、エポキシ当量167g/eq、ナガセケムテックス株式会社製
・PYRATEX(登録商標)-LB:ビニルピリジン-スチレン-ブタジエン共重合体ゴムラテックス、固形分濃度38.8%、日本エイアンドエル株式会社製
・ニポール(登録商標)LX-112:スチレン-ブタジエン共重合体ゴムラテックス、固形分濃度41%、日本ゼオン株式会社製
・エポクロス(登録商標)K-2035E:スチレン-アクリル系共重合体をポリマー主鎖とするオキサゾリン基を側鎖に有する高分子化合物の水系乳化物、固形分濃度40%、株式会社日本触媒製
・エパン(登録商標)680:プルロニック(登録商標)型非イオン界面活性剤、数平均分子量8750、エチレンオキシド重量分率80%、第一工業製薬株式会社製
・ネオコール(登録商標)P:ジオクチルスルホコハク酸エステル塩、第一工業製薬株式会社製
・スミカノール(登録商標)700S:レゾルシン・ホルムアルデヒド初期縮合物、固形分濃度65%、住友化学株式会社製
・DM-6400:MDI型の水分散型ブロックイソシアネート、固形分濃度42%、再生イソシアネート基(水分散型ブロックイソシアネートからブロック化剤を脱離させた場合のイソシアネート基)濃度7.90%、明成化学工業株式会社製
・スメクトン(登録商標)-ST:合成スメクタイト、クニミネ工業株式会社製
・FUJI SP BLACK 203:カーボンブラック分散液、固形分濃度23.5%、冨士色素株式会社製
重合体の重量平均分子量は、ゲルパーミエーションクロマトグラフィー(GPC)を用い、以下の条件で測定した。
装置:東ソー株式会社製HLC‐8320GPC
検出器:RI
カラム:東ソー株式会社製 TSKgel guardcolumn,G3000PWXL(2本)をサンプルの入り口からこの順に連結。
カラム温度:40℃
流速:0.5ml/min
校正曲線作成用標準物質:American Polymer Standards社製のポリアクリル酸ナトリウム標準サンプル(ピークトップ分子量(Mp)=900~475,000の間で7種)
校正曲線:上記標準物質のMp値と溶出時間とを基礎にした3次式
溶離液:0.08Mリン酸緩衝液
重合体のpHは以下の条件にて測定した。
装置:株式会社堀場製作所製 pH METER D-52
電極:ガラス電極
温度:25℃
ポリカルボン酸系重合体粒子の水分散体を、重合体粒子の濃度が0.01~0.05質量%となるようにイオン交換水で希釈し、光散乱粒度分布測定機(スペクトリス社製「Zetasizer Ultra」)を用いて、動的光散乱法により、重合体粒子の体積平均粒子径(nm)を求めた。
製造例1
重量平均分子量10,000のポリアクリル酸水溶液にモノエタノールアミン及びトリエチルアミンを投入し、pH7.0に調整後、純水で調整することによりポリカルボン酸系重合体(1)を含む固形分濃度53.0%の、製造例1のポリカルボン酸系重合体組成物を得た。なお、得られたポリカルボン酸系重合体は架橋構造を有しない重合体であり、液温25℃の組成物中に未溶解物が確認できなかったことから、ポリカルボン酸系重合体(1)は水溶性である。
重量平均分子量10,000のポリアクリル酸水溶液にジエチルアミン及びトリエチルアミンを投入し、pH7.0に調整後、純水で調整することによりポリカルボン酸系重合体(2)を含む固形分濃度53.5%の、製造例2のポリカルボン酸系重合体組成物を得た。なお、得られたポリカルボン酸系重合体は架橋構造を有しない重合体であり、液温25℃の組成物中に未溶解物が確認できなかったことから、ポリカルボン酸系重合体(2)は水溶性である。
製造例1においてトリエチルアミンの代わりにジエタノールアミンを使用し、pHを7.2に調整後、純水で調整することによりポリカルボン酸系重合体(3)を含む固形分濃度40.9%の、製造例3のポリカルボン酸系重合体組成物を得た。なお、得られたポリカルボン酸系重合体は架橋構造を有しない重合体であり、液温25℃の組成物中に未溶解物が確認できなかったことから、ポリカルボン酸系重合体(3)は水溶性である。
製造例1のポリカルボン酸系重合体組成物に更にトリエチルアミンを添加しpHを7.2に調整後、純水で調整することによりポリカルボン酸系重合体(4)を含む固形分濃度41.7%の、製造例4のポリカルボン酸系重合体組成物を得た。なお、得られたポリカルボン酸系重合体は架橋構造を有しない重合体であり、液温25℃の組成物中に未溶解物が確認できなかったことから、ポリカルボン酸系重合体(4)は水溶性である。
製造例1においてトリエチルアミンの代わりにアンモニア水を使用し、pHを7.2に調整後、純水で調整することによりポリカルボン酸系重合体(5)を含む固形分濃度45.1%の、製造例5のポリカルボン酸系重合体組成物を得た。なお、得られたポリカルボン酸系重合体は架橋構造を有しない重合体であり、液温25℃の組成物中に未溶解物が確認できなかったことから、ポリカルボン酸系重合体(5)は水溶性である。
重量平均分子量10,000のアクリル酸-マレイン酸共重合体水溶液にモノエタノールアミン及びジエタノールアミンを添加しpHを7.2に調整後、純水で調整することによりポリカルボン酸系重合体(6)を含む固形分濃度36.7%の、製造例6のポリカルボン酸系重合体組成物を得た。なお、得られたポリカルボン酸系重合体は架橋構造を有しない重合体であり、液温25℃の組成物中に未溶解物が確認できなかったことから、ポリカルボン酸系重合体(6)は水溶性である。
架橋構造を有するポリカルボン酸系重合体(7)(α-ヒドロキシメチルアクリル酸メチル-ジビニルベンゼン共重合体の加水分解物)のみからなるポリカルボン酸系重合体粒子(株式会社日本触媒製RX-6-AQ-WA-2210)を含有する、固形分濃度16.6%の、製造例7のポリカルボン酸系重合体組成物を得た。なお、当該粒子は全体が均一な組成で体積平均粒子径は397nmであり、液温25℃の水分散液中で粒子形状を保持していた。
コア部として架橋構造を有しないアクリル系重合体(本発明におけるポリカルボン酸系重合体には該当しない)、シェル部として架橋構造を有するポリカルボン酸系重合体(7)(α-ヒドロキシメチルアクリル酸メチル-ジビニルベンゼン共重合体の加水分解物)からなるポリカルボン酸系重合体粒子(株式会社日本触媒製RX-6-AQ-WA-11210)を含む固形分濃度12.9%の、製造例8のポリカルボン酸系重合体組成物を得た。なお、得られたポリカルボン酸系重合体粒子はシェル部に架橋構造を有し、平均粒子径は450nmであり、液温25℃の水分散液中で粒子形状を保持していた。
コア部として架橋構造を有するアクリル系重合体(本発明におけるポリカルボン酸系重合体には該当しない)、シェル部として架橋構造を有するポリカルボン酸系重合体(7)(α-ヒドロキシメチルアクリル酸メチル-ジビニルベンゼン共重合体の加水分解物)からなるポリカルボン酸系重合体粒子(株式会社日本触媒製RX-6-AQ-WA-51310)を含む固形分濃度18.1%の、製造例9のポリカルボン酸系重合体組成物を得た。なお、当該ポリカルボン酸系重合体粒子はコア部とシェル部に架橋構造を有し、平均粒子径は349nmであり、液温25℃の水分散液中で粒子形状を保持していた。
製造例10
攪拌機、冷却管及び温度計を備えたセパラブルフラスコに、4,4’-ジフェニルメタンジイソシアネートを100部(イソシアネート基の量0.800mol)、ε-カプロラクタムを100部(NH基の量0.884mol)、ジオキサンを200部仕込み、攪拌を続けながら徐々に昇温して85℃に保持し、120分間反応させた後ジオキサンを除去し、ブロックイソシアネート化合物を得た。次に、水94.3部にブロックイソシアネート化合物を100部、エパン680を10.7部加え、湿式微分散機で微分散し、固形分濃度54%の、製造例10の水分散型のブロックイソシアネートを得た。製造例10の水分散型ブロックイソシアネートにおける再生イソシアネート基(水分散型ブロックイソシアネートからブロック化剤を脱離させた場合のイソシアネート基)の濃度は8.60%であった。
実施例1-1
水582.3部にデナコールEX-313を11.6部添加し、均一に溶解した。次に、製造例10の水分散型ブロックイソシアネートを36.3部(固形分19.6部)添加し均一に混合した。次に、PYRATEX-LBを360.8部(固形分140.0部)添加し均一に混合した。次に、製造例1のポリカルボン酸系重合体組成物を7.17部(固形分3.8部)添加し均一に混合した。最後に、エポクロスK-2035Eを1.80部(固形分0.56部)ゆっくりかきまぜながら加え、均一に混合して、固形分濃度17.6%の実施例1-1のゴム補強用繊維処理剤を得た。
ゴム補強用繊維処理剤に使用する原材料、繊維(ポリエステルコードは「PET」、ナイロンコード(1400dtex、二本撚り)は「Ny」と表記)を表1及び表2に記載するもの及び量に変えた以外は実施例1-1と同様にして、実施例1-2~1-14、比較例1-1~1-4の各々のゴム補強用繊維処理剤及びゴム補強用繊維を得た。
水384.7部にPYRATEX-LBを300.7部(固形分116.7部)と、ニポールLX-112を125.0部(固形分51.3部)添加し均一に混合してラテックス希釈液とした。一方、水126.5部に濃度10%水酸化ナトリウム水溶液を7.0部加えて混合し、スミカノール700Sを45.0部(固形分29.3部)添加して、均一に溶解してレゾルシン・ホルムアルデヒド初期縮合物溶液とした。次に、ラテックス希釈液にレゾルシン・ホルムアルデヒド初期縮合物溶液をゆっくりかきまぜながら加え、更にホルマリン(濃度37%水溶液)を11.1部添加し、均一に混合して、固形分濃度20.0%のゴム補強用繊維処理剤を得た。このゴム補強用繊維処理剤をそのまま加工液として用い、繊維(ナイロンコード、1400dtex、二本撚り)を浸漬処理し、130℃で2分間乾燥処理し、続いて240℃で2分間加熱処理を行って、繊維表面に接着性組成物が付着したゴム補強用繊維を得た。繊維への接着性組成物の固形分付着量は、付着率で7.2%であった。
天然ゴム70部、スチレン-ブタジエン共重合体ゴム30部、カーボンブラック粉末60部、酸化亜鉛粉末4部、ステアリン酸1.5部、アロマオイル8部、硫黄2.5部、加硫促進剤(N-シクロヘキシル-2-ベンゾチアゾリルスルフェンアミド)1.1部をよく混錬した後、シート状に形成し未加硫ゴムシートとした。未加硫ゴムシートの表面近くに実施例1-1のゴム補強用繊維を7本埋設し、4.7MPaのプレス圧力で、150℃で30分間加硫することにより、ゴム補強用繊維表面にゴム組成物が付着してシート状となった実施例1-1のゴム製品を得た。実施例1-2~1-14、比較例1-1~1-4、参考例1の各ゴム補強用繊維についても、同様にしてゴム製品を得た。
得られた各々のゴム製品について、精密万能試験機(オートグラフ(登録商標)AG-X、株式会社島津製作所製)を用い、平面つかみ具を使用して、両端のコードを残し5本のコードを保持し、ゴムシート面に対し90度の方向へ300mm/分の速度で剥離し、その際に要する力を測定した。測定値を5で割った値(コード1本あたりの力)を接着力とした。接着力は、17N以上であると実用に供することができる。結果を表1及び表2に示す。
上記の接着力の評価において、ゴムシートから剥離されたゴム補強用繊維の表面を目視で観察し、下記の基準で評価した。ゴム付着量は、「○」又は「◎」であると実用に供することができる。結果を表1及び表2に示す。
◎:付着した黒色のゴム組成物の量が多く、コードの見えている部分がない。
○:付着した黒色のゴム組成物の量は多いが、一部にコードが見えている部分がある。
△:全体的に付着した黒色のゴム組成物の量が少なく、コードが見えている部分が多い。
×:黒色のゴム組成物が付いていない、又はほとんど付いていない。
実施例1-7、1-10、比較例1-1のゴム補強用繊維を再度作製し、繊維への接着性組成物の固形分付着量を再度評価した。
各ゴム補強用繊維から上記と同様に得たゴム製品について、120℃の加温庫で5分間加熱した後に、120℃の環境下で測定を行った以外は上記の接着力の評価と同様にして、耐熱接着力を評価した。耐熱接着力は、4.5N以上であると実用に供することができる。結果を表3に示す。
上記の耐熱接着力の評価において、ゴムシートから剥離されたゴム補強用繊維の表面を目視で観察した以外は上記のゴム付着量の評価と同様にして、耐熱ゴム付着量を評価した。耐熱ゴム付着量は、「△」、「○」、「◎」のいずれかであると実用に供することができる。結果を表3に示す。
実施例2-1
水973.6部にデナコールEX-614を13.3部と、ネオコールPを0.7部添加し、均一に溶解した。次に、製造例10の水分散型ブロックイソシアネートを12.4部(固形分6.7部)添加し、均一に混合して、固形分濃度2.07%の処理剤1を得た。これとは別に、水484.3部にPYRATEX-LBを484.5部(固形分188.3部)添加し均一に混合した。次に、製造例3のポリカルボン酸系重合体組成物を23.72部(固形分9.7部)添加し均一に混合した。最後に、エポクロスK-2035Eを7.40部(固形分2.96部)ゆっくりかきまぜながら加え、均一に混合して、固形分濃度20.1%の処理剤2を得た。得られた処理剤1と処理剤2で、実施例2-1のゴム補強用繊維処理剤キットとした。
ゴム補強用繊維処理剤に使用する原材料を表4に記載するもの及び量に変えた以外は実施例2-1と同様にして、2-2~2-8、比較例2-1の各々のゴム補強用繊維処理剤キット及びゴム補強用繊維を得た。繊維は全てポリエステルコードを用いた。
水973.6部にデナコールEX-614を13.3部と、ネオコールPを0.7部添加し、均一に溶解した。次に、製造例10の水分散型ブロックイソシアネートを12.4部(固形分6.7部)添加し、均一に混合して、固形分濃度2.07%の前処理剤を得た。これとは別に、水384.7部にPYRATEX-LBを300.7部(固形分116.7部)と、ニポールLX-112を125.0部(固形分51.3部)添加し均一に混合してラテックス希釈液とした。一方、水126.5部に濃度10%水酸化ナトリウム水溶液を7.0部加えて混合し、スミカノール700Sを45.0部(固形分29.3部)添加して、均一に溶解してレゾルシン・ホルムアルデヒド初期縮合物溶液とした。次に、ラテックス希釈液にレゾルシン・ホルムアルデヒド初期縮合物溶液をゆっくりかきまぜながら加え、更にホルマリン(濃度37%水溶液)を11.1部添加し、均一に混合して、固形分濃度20.0%の後処理剤を得た。得られた前処理剤と後処理剤で、参考例2のゴム補強用繊維処理剤キットとした。ポリエステルコードへの加工条件は、実施例2-1と同様にして(処理剤1に代えて前処理剤、処理剤2に代えて後処理剤を使用)実施し、ゴム補強用繊維を得た。
ゴム補強用繊維処理剤に使用する原材料を表6に記載するもの及び量に変えた以外は実施例2-1あるいは参考例2と同様にして、実施例2-9、2-10、参考例3、4の各々のゴム補強用繊維処理剤キット及びゴム補強用繊維を得た。繊維はアラミドコード(1110dtex、二本撚り、表中「Ara」と表記)を用いた。
得られた各々のゴム補強用繊維を用いて、実施例1-1と同様にしてゴム製品を作製し、実施例1-1と同様にして接着力とゴム付着量を評価した。結果を表4及び表6に示す。実施例2-1、2-6、比較例2-1、参考例2の各ゴム補強用繊維及び各ゴム製品については、実施例1-7、1-10、比較例1-1と同様にして繊維への接着性組成物の固形分付着量、耐熱接着力と耐熱ゴム付着量を評価した。結果を表5に示す。
Claims (14)
- レゾルシン及びホルムアルデヒドを含まないゴム補強用繊維処理剤であって、ポリカルボン酸系重合体と、エポキシ化合物と、ポリマー分子中にビニルピリジンに由来する構造を有するゴムラテックスと、ブロックイソシアネート化合物を含有するゴム補強用繊維処理剤。
- 更に、オキサゾリン基を有する高分子化合物を含有する請求項1に記載のゴム補強用繊維処理剤。
- 前記ポリカルボン酸系重合体が、架橋構造を有し、ポリカルボン酸系重合体粒子に含まれるものであるか、架橋構造を有しない重合体である請求項1又は2に記載のゴム補強用繊維処理剤。
- 前記ポリカルボン酸系重合体粒子が、体積平均粒子径が10nm~10μmの微粒子である請求項3に記載のゴム補強用繊維処理剤。
- レゾルシン及びホルムアルデヒドを含まないゴム補強用繊維処理剤のキットであって、エポキシ化合物と、ブロックイソシアネート化合物とを含有する処理剤1、及び、ポリマー分子中にビニルピリジンに由来する構造を有するゴムラテックスと、ポリカルボン酸系重合体と、オキサゾリン基を有する高分子化合物を含有する処理剤2を含むゴム補強用繊維処理剤キット。
- 前記ポリカルボン酸系重合体が、架橋構造を有し、ポリカルボン酸系重合体粒子に含まれるものであるか、架橋構造を有しない重合体である請求項5に記載のゴム補強用繊維処理剤キット。
- 前記ポリカルボン酸系重合体粒子が、体積平均粒子径が10nm~10μmの微粒子である請求項6に記載のゴム補強用繊維処理剤キット。
- 請求項5~7のいずれかに記載のゴム補強用繊維処理剤キットを使用し、繊維に、前記処理剤1を含む加工液を付着させる処理を行い、その後、前記処理剤2を含む加工液を付着させる処理を行う工程を有する、ゴム補強用繊維の製造方法。
- 繊維表面に、ポリカルボン酸系重合体と、エポキシ化合物と、ポリマー分子中にビニルピリジンに由来する構造を有するゴムラテックスと、ブロックイソシアネート化合物を含有する組成物を加熱処理して得た接着性組成物が付着したゴム補強用繊維。
- 繊維表面に、ポリカルボン酸系重合体と、エポキシ化合物と、ポリマー分子中にビニルピリジンに由来する構造を有するゴムラテックスと、ブロックイソシアネート化合物と、オキサゾリン基を有する高分子化合物を含有する組成物を加熱処理して得た接着性組成物が付着したゴム補強用繊維。
- 前記ポリカルボン酸系重合体が、架橋構造を有し、ポリカルボン酸系重合体粒子に含まれるものであるか、架橋構造を有しない重合体である請求項9又は10に記載のゴム補強用繊維。
- 前記ポリカルボン酸系重合体粒子が、体積平均粒子径が10nm~10μmの微粒子である請求項11に記載のゴム補強用繊維。
- 前記繊維が、ポリエステル、ナイロン及びアラミドのいずれかを含む請求項9又は10に記載のゴム補強用繊維。
- 請求項9又は10に記載のゴム補強用繊維を含有するゴム製品。
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| JP7557832B2 (ja) | 2024-09-30 |
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| KR20250036204A (ko) | 2025-03-13 |
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