WO2015046391A1 - ディップ成形用組成物およびディップ成形体 - Google Patents
ディップ成形用組成物およびディップ成形体 Download PDFInfo
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- WO2015046391A1 WO2015046391A1 PCT/JP2014/075549 JP2014075549W WO2015046391A1 WO 2015046391 A1 WO2015046391 A1 WO 2015046391A1 JP 2014075549 W JP2014075549 W JP 2014075549W WO 2015046391 A1 WO2015046391 A1 WO 2015046391A1
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- WIPO (PCT)
- Prior art keywords
- dip
- polycarboxylic acid
- weight
- salt
- synthetic polyisoprene
- Prior art date
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- 239000000203 mixture Substances 0.000 title claims abstract description 83
- 238000000465 moulding Methods 0.000 title claims abstract description 83
- 239000002253 acid Substances 0.000 claims abstract description 64
- 229920003051 synthetic elastomer Polymers 0.000 claims abstract description 64
- 150000003839 salts Chemical class 0.000 claims abstract description 49
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- 239000004816 latex Substances 0.000 claims abstract description 34
- 238000004073 vulcanization Methods 0.000 claims abstract description 29
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 23
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 22
- 239000011593 sulfur Substances 0.000 claims abstract description 22
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 19
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 16
- 159000000000 sodium salts Chemical group 0.000 claims description 16
- 229920001519 homopolymer Polymers 0.000 claims description 11
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- 239000002184 metal Substances 0.000 claims description 9
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- ZCCIPPOKBCJFDN-UHFFFAOYSA-N calcium nitrate Chemical compound [Ca+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ZCCIPPOKBCJFDN-UHFFFAOYSA-N 0.000 description 6
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- 230000015572 biosynthetic process Effects 0.000 description 3
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- BECPQYXYKAMYBN-UHFFFAOYSA-N casein, tech. Chemical compound NCCCCC(C(O)=O)N=C(O)C(CC(O)=O)N=C(O)C(CCC(O)=N)N=C(O)C(CC(C)C)N=C(O)C(CCC(O)=O)N=C(O)C(CC(O)=O)N=C(O)C(CCC(O)=O)N=C(O)C(C(C)O)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=O)N=C(O)C(CCC(O)=O)N=C(O)C(COP(O)(O)=O)N=C(O)C(CCC(O)=N)N=C(O)C(N)CC1=CC=CC=C1 BECPQYXYKAMYBN-UHFFFAOYSA-N 0.000 description 3
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- SSDSCDGVMJFTEQ-UHFFFAOYSA-N octadecyl 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)CCC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 SSDSCDGVMJFTEQ-UHFFFAOYSA-N 0.000 description 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 description 1
- 235000021313 oleic acid Nutrition 0.000 description 1
- 210000000056 organ Anatomy 0.000 description 1
- PNJWIWWMYCMZRO-UHFFFAOYSA-N pent‐4‐en‐2‐one Natural products CC(=O)CC=C PNJWIWWMYCMZRO-UHFFFAOYSA-N 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- XCRBXWCUXJNEFX-UHFFFAOYSA-N peroxybenzoic acid Chemical compound OOC(=O)C1=CC=CC=C1 XCRBXWCUXJNEFX-UHFFFAOYSA-N 0.000 description 1
- 125000005634 peroxydicarbonate group Chemical group 0.000 description 1
- 239000002530 phenolic antioxidant Substances 0.000 description 1
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical compound OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- PMJHHCWVYXUKFD-UHFFFAOYSA-N piperylene Natural products CC=CC=C PMJHHCWVYXUKFD-UHFFFAOYSA-N 0.000 description 1
- 229950010765 pivalate Drugs 0.000 description 1
- IUGYQRQAERSCNH-UHFFFAOYSA-N pivalic acid Chemical compound CC(C)(C)C(O)=O IUGYQRQAERSCNH-UHFFFAOYSA-N 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- 230000002335 preservative effect Effects 0.000 description 1
- HJWLCRVIBGQPNF-UHFFFAOYSA-N prop-2-enylbenzene Chemical compound C=CCC1=CC=CC=C1 HJWLCRVIBGQPNF-UHFFFAOYSA-N 0.000 description 1
- BWJUFXUULUEGMA-UHFFFAOYSA-N propan-2-yl propan-2-yloxycarbonyloxy carbonate Chemical compound CC(C)OC(=O)OOC(=O)OC(C)C BWJUFXUULUEGMA-UHFFFAOYSA-N 0.000 description 1
- 239000012744 reinforcing agent Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- 235000017557 sodium bicarbonate Nutrition 0.000 description 1
- AJPJDKMHJJGVTQ-UHFFFAOYSA-M sodium dihydrogen phosphate Chemical compound [Na+].OP(O)([O-])=O AJPJDKMHJJGVTQ-UHFFFAOYSA-M 0.000 description 1
- VQBIMXHWYSRDLF-UHFFFAOYSA-M sodium;azane;hydrogen carbonate Chemical compound [NH4+].[Na+].[O-]C([O-])=O VQBIMXHWYSRDLF-UHFFFAOYSA-M 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 238000001256 steam distillation Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 239000005720 sucrose Substances 0.000 description 1
- 125000004434 sulfur atom Chemical group 0.000 description 1
- FWMUJAIKEJWSSY-UHFFFAOYSA-N sulfur dichloride Chemical compound ClSCl FWMUJAIKEJWSSY-UHFFFAOYSA-N 0.000 description 1
- 229940052367 sulfur,colloidal Drugs 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000010557 suspension polymerization reaction Methods 0.000 description 1
- TUNFSRHWOTWDNC-HKGQFRNVSA-N tetradecanoic acid Chemical compound CCCCCCCCCCCCC[14C](O)=O TUNFSRHWOTWDNC-HKGQFRNVSA-N 0.000 description 1
- WGKLOLBTFWFKOD-UHFFFAOYSA-N tris(2-nonylphenyl) phosphite Chemical compound CCCCCCCCCC1=CC=CC=C1OP(OC=1C(=CC=CC=1)CCCCCCCCC)OC1=CC=CC=C1CCCCCCCCC WGKLOLBTFWFKOD-UHFFFAOYSA-N 0.000 description 1
- 229910021642 ultra pure water Inorganic materials 0.000 description 1
- 239000012498 ultrapure water Substances 0.000 description 1
- 239000006097 ultraviolet radiation absorber Substances 0.000 description 1
- 238000001238 wet grinding Methods 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
- 150000003751 zinc Chemical class 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000004246 zinc acetate Substances 0.000 description 1
- 239000011592 zinc chloride Substances 0.000 description 1
- 235000005074 zinc chloride Nutrition 0.000 description 1
- RKQOSDAEEGPRER-UHFFFAOYSA-L zinc diethyldithiocarbamate Chemical compound [Zn+2].CCN(CC)C([S-])=S.CCN(CC)C([S-])=S RKQOSDAEEGPRER-UHFFFAOYSA-L 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
- C08L9/10—Latex
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/06—Sulfur
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/36—Sulfur-, selenium-, or tellurium-containing compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/36—Sulfur-, selenium-, or tellurium-containing compounds
- C08K5/37—Thiols
- C08K5/375—Thiols containing six-membered aromatic rings
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/36—Sulfur-, selenium-, or tellurium-containing compounds
- C08K5/39—Thiocarbamic acids; Derivatives thereof, e.g. dithiocarbamates
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
- C08L33/02—Homopolymers or copolymers of acids; Metal or ammonium salts thereof
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2312/00—Crosslinking
Definitions
- the present invention relates to a dip molding composition containing a latex of synthetic polyisoprene, and a dip molding formed by dip molding the dip molding composition.
- a dip-molded product which is dip-molded with a dip-molding composition containing a natural latex typified by a natural rubber latex and used in contact with a human body such as a nipple, balloon, glove, balloon or sack. It has been.
- natural latex contains a protein that causes allergic symptoms in the human body
- Patent Document 1 discloses a composition for dip molding in which a latex of acrylonitrile-butadiene copolymer rubber containing an ethylenically unsaturated acid monomer unit is blended with a vulcanization accelerator composed of sulfur, zinc oxide and a thiazole compound.
- a dip-molded body obtained by dip-molding a product is disclosed.
- the dip-molded body of Patent Document 1 does not contain a protein that causes allergic symptoms in the human body, it has a high stress at 300% elongation and is not satisfactory in terms of flexibility.
- Patent Document 2 discloses a dip molding composition in which sulfur, zinc oxide, a specific vulcanization accelerator and a dispersant are blended with a synthetic polyisoprene latex.
- the dip-forming composition disclosed in Patent Document 2 can provide a dip-molded body that is flexible and excellent in tensile strength, but this Patent Document 2 uses casein as a dispersant.
- An alkaline earth metal salt is used, and casein is a kind of protein, which may cause allergic symptoms in the human body.
- the composition for dip molding containing the latex of synthetic polyisoprene is usually aged for a suitable period (also called pre-vulcanization) so that the tensile strength of the resulting dip molded article is stably kept high. After that, it will be used for dip molding.
- a suitable period also called pre-vulcanization
- the alkaline earth metal salt of casein as a dispersant when the alkaline earth metal salt of casein as a dispersant is not blended, the tensile strength of the resulting dip-molded product is inferior unless the aging period is lengthened.
- the dispersion stability of the latex of synthetic polyisoprene is lowered, and coarse agglomerates are formed during aging, making it difficult to use for dip molding.
- the present invention is excellent in tensile strength and elongation even when the aging temperature is relatively low and the aging time is relatively short while suppressing the formation of coarse aggregates during aging, and the human body
- An object of the present invention is to provide a dip-molding composition that can provide a dip-molded body having excellent safety even when used in contact with a dip-mold.
- the present inventors have found that a latex of a synthetic polyisoprene having a weight average molecular weight of 10,000 to 5,000,000, a sulfur vulcanizing agent, and a vulcanization accelerator. It has been found that the above object can be achieved by blending a polycarboxylic acid and / or a salt of polycarboxylic acid with the composition for dip molding contained, and the present invention has been completed.
- a latex of synthetic polyisoprene having a weight average molecular weight of 10,000 to 5,000,000, a polycarboxylic acid and / or a salt of polycarboxylic acid, a sulfur vulcanizing agent, A dip molding composition comprising a vulcanization accelerator is provided.
- the polycarboxylic acid and / or the salt of the polycarboxylic acid is a polymer polymerized using an oil-soluble polymerization initiator or a salt thereof.
- the polycarboxylic acid is a homopolymer of methacrylic acid
- the salt of the polycarboxylic acid is a metal salt of a homopolymer of methacrylic acid
- the metal salt is a sodium salt.
- the polycarboxylic acid and / or the salt of the polycarboxylic acid has a weight average molecular weight of 1,000 to 300,000.
- the content of the polycarboxylic acid and / or the salt of the polycarboxylic acid is 0.01 to 20 parts by weight with respect to 100 parts by weight of the synthetic polyisoprene.
- the dip molding composition of the present invention preferably further contains zinc oxide.
- the aging temperature is relatively low, and even when the aging time is relatively short, the tensile strength and elongation are excellent, and
- a dip-molding composition capable of providing a dip-molded article having excellent safety even when used in contact with the human body, and dip-molding the dip-molding composition, and having tensile strength and elongation
- the dip molding composition of the present invention comprises a latex of synthetic polyisoprene having a weight average molecular weight of 10,000 to 5,000,000, a polycarboxylic acid and / or a salt of polycarboxylic acid, and a sulfur vulcanizing agent. And a vulcanization accelerator.
- the synthetic polyisoprene latex used in the present invention is a latex of synthetic polyisoprene having a weight average molecular weight of 10,000 to 5,000,000 obtained by polymerizing isoprene.
- Synthetic polyisoprene may be copolymerized with other ethylenically unsaturated monomers copolymerizable with isoprene.
- the content of isoprene units in the synthetic polyisoprene is flexible, and it is easy to obtain a dip-molded product excellent in tensile strength. Therefore, it is preferably 70% by weight or more, more preferably 90% by weight, based on all monomer units. More preferably, it is 95% by weight or more, particularly preferably 100% by weight (isoprene homopolymer).
- Examples of other ethylenically unsaturated monomers copolymerizable with isoprene include conjugated diene monomers other than isoprene such as butadiene, chloroprene and 1,3-pentadiene; acrylonitrile, methacrylonitrile, fumaronitrile, ⁇ - Ethylenically unsaturated nitrile monomers such as chloroacrylonitrile; vinyl aromatic monomers such as styrene and alkylstyrene; methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, (meth) And ethylenically unsaturated carboxylic acid ester monomers such as 2-ethylhexyl acrylate.
- the other ethylenically unsaturated monomer copolymerizable with these isoprenes may be used alone or in combination of two or more.
- isoprene units in the synthetic polyisoprene which are cis bond units, trans bond units, 1,2-vinyl bond units, and 3,4-vinyl bond units, depending on the bond state of isoprene.
- the content of cis-bond units in the isoprene units contained in the synthetic polyisoprene is preferably relative to the total isoprene units. Is 70% by weight or more, more preferably 90% by weight or more, and particularly preferably 95% by weight or more.
- the weight average molecular weight of the synthetic polyisoprene is 10,000 to 5,000,000, preferably 500,000 to 5,000,000, particularly in terms of standard polystyrene by gel permeation chromatography analysis. Preferably, it is 800,000 to 3,000,000. If the weight average molecular weight of the synthetic polyisoprene is too small, the tensile strength of the resulting dip-molded product tends to decrease. Conversely, if it is too large, the synthetic polyisoprene latex tends to be difficult to produce.
- the polymer Mooney viscosity [ML 1 + 4 , 100 ° C.] of the synthetic polyisoprene is preferably 50 to 80, more preferably 60 to 80, and particularly preferably 70 to 80.
- the method for producing the synthetic polyisoprene latex used in the present invention is not particularly limited.
- a solution or fine suspension of synthetic polyisoprene dissolved or finely dispersed in an organic solvent is added in the presence of a surfactant.
- II Isoprene alone or a mixture of isoprene and an ethylenically unsaturated monomer copolymerizable therewith, by emulsifying in water and removing the organic solvent if necessary.
- synthetic polyisoprene having a high proportion of cis-bond units in isoprene units can be used, and a dip-molded article having excellent tensile strength can be easily obtained, and therefore the production method (1) is preferable.
- a Ziegler polymerization catalyst composed of trialkylaluminum-titanium tetrachloride or an alkyllithium polymerization catalyst such as n-butyllithium or sec-butyllithium is used.
- a polymerization solution of synthetic polyisoprene can be obtained by solution polymerization of isoprene in a solvent. Then, the synthetic polyisoprene polymerization solution thus obtained is used as it is, or after the solid synthetic polyisoprene is taken out from the polymerization solution, the solid synthetic polyisoprene is dissolved in an organic solvent and used.
- the latex of synthetic polyisoprene can be obtained by emulsifying in water in the presence of a surfactant and removing the organic solvent if necessary. In this case, commercially available solid synthetic polyisoprene can also be used.
- Examples of the organic solvent used in the production method (1) include aromatic hydrocarbon solvents such as benzene, toluene, and xylene; alicyclic hydrocarbon solvents such as cyclopentane, cyclopentene, and cyclohexane; pentane, hexane, heptane, and the like. Aliphatic hydrocarbon solvents such as methylene chloride, chloroform, ethylene dichloride, and the like. Among these, an aromatic hydrocarbon solvent and an alicyclic hydrocarbon solvent are preferable, and among them, an alicyclic hydrocarbon solvent is preferable, and cyclohexane is particularly preferable.
- the amount of the organic solvent used is preferably 2,000 parts by weight or less, more preferably 20 to 1,500 parts by weight with respect to 100 parts by weight of the synthetic polyisoprene.
- Examples of the surfactant used in the production method of (1) above include nonionic surfactants such as polyoxyethylene alkyl ether, polyoxyethylene alkyl phenol ether, polyoxyethylene alkyl ester, polyoxyethylene sorbitan alkyl ester; Anionic surfactants such as salts of fatty acids such as myristic acid, palmitic acid, oleic acid, linolenic acid, alkylbenzene sulfonates such as sodium dodecylbenzenesulfonate, higher alcohol sulfates, alkylsulfosuccinates; alkyltrimethylammonium And cationic surfactants such as chloride, dialkylammonium chloride, and benzylammonium chloride.
- nonionic surfactants such as polyoxyethylene alkyl ether, polyoxyethylene alkyl phenol ether, polyoxyethylene alkyl ester, polyoxyethylene sorbitan alkyl ester
- Anionic surfactants such
- copolymerizable surfactants such as sulfoesters of ⁇ , ⁇ -unsaturated carboxylic acids, sulfate esters of ⁇ , ⁇ -unsaturated carboxylic acids, and sulfoalkylaryl ethers.
- anionic surfactants are preferred. These surfactants can be used alone or in combination of two or more.
- the amount of the surfactant used is preferably 0.5 to 50 parts by weight, more preferably 0.5 to 40 parts by weight, and further preferably 5 to 30 parts by weight with respect to 100 parts by weight of the synthetic polyisoprene. is there. If the amount of the surfactant used is too small, a large amount of agglomerates may be generated during emulsification. Conversely, if the amount is too large, foaming is likely to occur and pinholes may be generated in the dip-formed product.
- the amount of water used in the production method (1) is preferably 50 to 5000 parts by weight, more preferably 500 to 4000 parts by weight with respect to 100 parts by weight of the synthetic polyisoprene.
- Examples of the water to be used include hard water, soft water, ion exchange water, distilled water, zeolite water and the like, and soft water, ion exchange water and distilled water are preferable.
- An apparatus for emulsifying a solution or fine suspension of a synthetic polyisoprene dissolved or finely dispersed in an organic solvent in water in the presence of a surfactant is particularly suitable if it is generally marketed as an emulsifier or a disperser. Can be used without limitation.
- the addition method of the surfactant is not particularly limited, and even if it is added in advance to a solution or fine suspension of water and / or synthetic polyisoprene, it is added to the emulsion during the emulsification operation. They may be added all at once or in divided portions.
- emulsifier examples include batch type emulsification such as trade name “Homogenizer” (manufactured by IKA), trade name “Polytron” (manufactured by Kinematica), trade name “TK auto homomixer” (manufactured by Tokushu Kika Kogyo Co., Ltd.), etc.
- the organic solvent preferably an alicyclic hydrocarbon solvent
- the content of the organic solvent (preferably an alicyclic hydrocarbon solvent) in the resultant synthetic polyisoprene latex is preferably 500 ppm by weight or less.
- Methods such as atmospheric distillation, steam distillation, and centrifugation can be employed.
- the solid concentration of the synthetic polyisoprene latex used in the present invention is preferably 30 to 70% by weight, more preferably 40 to 70% by weight. By setting the solid content concentration within the above range, it is possible to appropriately prevent the synthetic polyisoprene particles from aggregating to generate coarse aggregates.
- the volume average particle diameter of the synthetic polyisoprene particles contained in the latex of the synthetic polyisoprene used in the present invention is preferably 0.05 to 3 ⁇ m, more preferably 0.2 to 2 ⁇ m. If the volume average particle size is too small, the latex viscosity becomes too high, and the handleability may be deteriorated.On the other hand, if the volume average particle size is too large, when the synthetic polyisoprene latex is stored, There is a possibility that a film is formed on the latex surface and the handleability is deteriorated.
- the latex of the synthetic polyisoprene used in the present invention includes a pH adjuster, an antifoaming agent, a preservative, a cross-linking agent, a chelating agent, an oxygen scavenger, a dispersing agent, etc., as long as the effects of the present invention are not impaired. You may mix
- the pH adjuster include alkali metal hydroxides such as sodium hydroxide and potassium hydroxide; alkali metal carbonates such as sodium carbonate and potassium carbonate; alkali metal hydrogen carbonates such as sodium bicarbonate; ammonia And organic amine compounds such as trimethylammonium and triethanolamine.
- the dip molding composition of the present invention contains a polycarboxylic acid and / or a salt of polycarboxylic acid.
- the polycarboxylic acid and / or the salt of the polycarboxylic acid acts as a dispersant in the dip molding composition of the present invention.
- the formation of coarse aggregates during aging can be suppressed, and the aging temperature is made relatively low,
- the polycarboxylic acid and / or the salt of the polycarboxylic acid does not contain a protein that causes allergic symptoms in the human body. Therefore, the obtained dip-molded product is excellent when used in contact with the human body. It may indicate safety.
- the polycarboxylic acid used in the present invention is, for example, a homopolymer of an ⁇ , ⁇ -unsaturated carboxylic acid monomer, or an ⁇ , ⁇ -unsaturated carboxylic acid monomer and an ethylenically unsaturated monomer copolymerizable therewith. And the like.
- the above (co) polymers are those in which the ⁇ , ⁇ -unsaturated carboxylic acid monomer unit in the (co) polymer is an acid. Those in the form of anhydrides are also included.
- the polycarboxylic acid salt used in the present invention is one in which at least a part of the carboxyl group or acid anhydride group present in these (co) polymers forms a salt.
- examples of polycarboxylic acid salts used in the present invention include alkali metal salts such as sodium and potassium; magnesium salts; alkaline earth metal salts such as calcium and barium; and ammonium salts and amine salts. Of these, metal salts are preferred, alkali metal salts are more preferred, and sodium salts are even more preferred. By using a metal salt, odor due to volatile components can be reduced.
- polycarboxylic acids and polycarboxylic acid salts polycarboxylic acid salts are preferred.
- the ⁇ , ⁇ -unsaturated carboxylic acid monomer is an unsaturated carboxylic acid having a carboxyl group or an acid anhydride group or an anhydride thereof. Specific examples thereof include acrylic acid, methacrylic acid, maleic acid, fumaric acid, Itaconic acid, maleic anhydride, itaconic anhydride, citraconic anhydride and the like can be mentioned.
- Examples of the ethylenically unsaturated monomer copolymerizable with the ⁇ , ⁇ -unsaturated carboxylic acid monomer include olefins having 2 to 10 carbon atoms, aromatic vinyl monomers, vinyl ether monomers, and alkyl acrylate esters. And monomers.
- olefin having 2 to 10 carbon atoms examples include ethylene, propylene, butene, 2-methyl-butene-1, 2-methyl-butene-2, hexene, octene, isoamylene, diisobutylene, decene, cyclopentene, cyclohexene, etc. Is mentioned.
- aromatic vinyl monomer examples include styrene, vinyl toluene, ⁇ -methylstyrene, coumarone, and indene.
- vinyl ether monomers include methyl vinyl ether.
- alkyl acrylate monomer examples include ethyl acrylate and methyl methacrylate.
- the content ratio of the ⁇ , ⁇ -unsaturated carboxylic acid monomer unit in the polycarboxylic acid and / or polycarboxylic acid salt used in the present invention is such that the effects of the present invention become more remarkable.
- the unit it is preferably 70 to 100% by weight, more preferably 90 to 100% by weight, particularly preferably 100% by weight (a homopolymer of an ⁇ , ⁇ -unsaturated carboxylic acid monomer or a salt thereof).
- the ⁇ , ⁇ -unsaturated carboxylic acid monomer acrylic acid and methacrylic acid are preferable, and methacrylic acid is particularly preferable. That is, the polycarboxylic acid and / or the salt of the polycarboxylic acid is preferably a methacrylic acid homopolymer and / or a tacrylic acid homopolymer salt.
- the production method of the polycarboxylic acid and / or the salt of polycarboxylic acid used in the present invention is not particularly limited, but the ⁇ , ⁇ -unsaturated carboxylic acid-based monomer, and a copolymer with this used as necessary A method of polymerizing a possible ethylenically unsaturated monomer by a known polymerization method may be mentioned.
- the salt of polycarboxylic acid what is necessary is just to convert the (co) polymer obtained by superposition
- the base used in this case is not particularly limited, but alkali metal hydroxides such as sodium hydroxide and potassium hydroxide; alkali metal carbonates such as sodium carbonate and potassium carbonate; alkali metals such as sodium hydrogen carbonate Ammonia; organic amine compounds such as trimethylammonium and triethanolamine; and the like.
- the polymerization method for polymerizing the ⁇ , ⁇ -unsaturated carboxylic acid monomer and the ethylenically unsaturated monomer copolymerizable therewith is not particularly limited. Examples thereof include a combination method and a fine suspension polymerization method, and among these, the fine suspension polymerization method is preferable.
- an oil-soluble polymerization initiator As the polymerization initiator used for the polymerization, either an oil-soluble polymerization initiator or a water-soluble polymerization initiator can be used. However, since the effect of the present invention becomes more remarkable, an oil-soluble polymerization initiator is used. It is preferable to use it. Examples of such oil-soluble polymerization initiators include organic peroxides and azo compounds.
- organic peroxides examples include diacyl peroxides such as 3,5,5-trimethylhexanoyl peroxide, lauroyl peroxide, and benzoyl peroxide; ketone peroxides such as methyl ethyl ketone peroxide; benzoyl hydroperoxide, cumene hydroperoxide Hydroperoxides such as oxide, p-cymene hydroperoxide, 1,1,3,3-tetramethylbutyl hydroperoxide, 2,5-dimethylhexane-2,5-dihydroperoxide; t-butylperoxy Peroxyesters such as pivalate; peroxydicarbonates such as diisopropyl peroxydicarbonate, di-2-ethylhexyl peroxydicarbonate; and the like.
- diacyl peroxides such as 3,5,5-trimethylhexanoyl peroxide, lauroyl peroxide, and benzoyl peroxide
- azo compound 2,2-azobisisobutyronitrile, 2,2-azobis (2-methylbutyronitrile), 2,2-azobis (2,4-dimethylvaleronitrile), 2,2-azobis (4-methoxy-2,4-dimethylvaleronitrile) and the like.
- water-soluble polymerization initiator include potassium persulfate and ammonium persulfate.
- a reducing agent In the polymerization, it is preferable to use a reducing agent.
- a reducing agent those generally used as a redox catalyst in combination with a peroxide, preferably an organic peroxide, can be suitably used.
- Specific examples of the reducing agent include sodium formaldehyde sulfoxylate (SFS), hydrosulfite, dimethylamine, ascorbic acid, sucrose, ferrous sulfate and the like, and these are used alone or in combination of two or more. be able to.
- the weight average molecular weight of the polycarboxylic acid and / or polycarboxylic acid salt used in the present invention is preferably 1,000 to 300,000, more preferably 50,000 to 300,000, and still more preferably 100,000. ⁇ 300,000. By setting the weight average molecular weight within the above range, the effect can be made more remarkable.
- the neutralization rate (conversion rate to the salt structure) of the carboxyl group in the polycarboxylic acid salt used in the present invention is preferably 70% or more, more preferably 80% or more, and 100%. More preferred.
- the content of the polycarboxylic acid and / or the salt of polycarboxylic acid in the dip molding composition of the present invention is not particularly limited, but is preferably 0.01 to 20 weights with respect to 100 parts by weight of the synthetic polyisoprene. Parts, more preferably 0.1 to 10 parts by weight, still more preferably 0.2 to 5 parts by weight. If the blending amount of the polycarboxylic acid and / or the salt of the polycarboxylic acid is too small, the effect of addition may be difficult to obtain. Sometimes film thickness control becomes difficult.
- sulfur-based vulcanizing agents used in the present invention include sulfur such as powdered sulfur, sulfur white, precipitated sulfur, colloidal sulfur, surface-treated sulfur, insoluble sulfur, and the like; sulfur chloride, sulfur dichloride, morpholine, Sulfur-containing compounds such as disulfides, alkylphenol disulfides, N, N′-dithio-bis (hexahydro-2H-azepinone-2), phosphorus-containing polysulfides, polymer polysulfides, 2- (4′-morpholinodithio) benzothiazoles; Etc. Of these, sulfur is preferably used. These sulfur vulcanizing agents can be used singly or in combination of two or more.
- the content of the sulfur vulcanizing agent in the dip molding composition of the present invention is not particularly limited, but is preferably 0.1 to 10 parts by weight, more preferably 0, relative to 100 parts by weight of the synthetic polyisoprene. .2 to 3 parts by weight. When this amount is in the above range, the tensile strength of the dip-molded product is further improved.
- a vulcanization accelerator usually used in dip molding can be used without limitation.
- the vulcanization accelerator include dithiocarbamic acids such as diethyldithiocarbamic acid, dibutyldithiocarbamic acid, di-2-ethylhexyldithiocarbamic acid, dicyclohexyldithiocarbamic acid, diphenyldithiocarbamic acid, dibenzyldithiocarbamic acid, and zinc salts thereof; 2-mercapto Benzothiazole, 2-mercaptobenzothiazole zinc, 2-mercaptothiazoline, dibenzothiazyl disulfide, 2- (2,4-dinitrophenylthio) benzothiazole, 2- (N, N-diethylthiocarbaylthio) benzothiazole, 2 -(2,6-dimethyl-4-morpholinothio) benzothiazole, 2- (4'-morpholino
- zinc diethyldithiocarbamate, zinc dibutyldithiocarbamate, 2-mercaptobenzothiazole, and zinc 2-mercaptobenzothiazole are preferable.
- These vulcanization accelerators can be used alone or in combination of two or more.
- the content of the vulcanization accelerator in the dip molding composition of the present invention is not particularly limited, but is preferably 0.05 to 5 parts by weight, more preferably 100 parts by weight of synthetic polyisoprene. 0.1 to 2 parts by weight. If this amount is too small, the tensile strength of the dip-molded product may decrease. Moreover, when there is too much this quantity, the elongation of a dip molded object and tensile strength may fall.
- the dip molding composition of the present invention preferably further contains zinc oxide.
- the content of zinc oxide in the dip molding composition of the present invention is not particularly limited, but is preferably 0.1-5 parts by weight, more preferably 0.2-0.2 parts by weight with respect to 100 parts by weight of the synthetic polyisoprene. 2 parts by weight. If this amount is too small, the tensile strength of the dip-molded product tends to decrease, and conversely if too large, the stability of the synthetic polyisoprene particles in the dip-molding composition decreases and coarse aggregates are generated. There is a case.
- the dip molding composition of the present invention further includes an anti-aging agent; a reinforcing agent such as carbon black, silica and talc; a filler such as calcium carbonate and clay; an ultraviolet absorber; a plasticizer; You may mix
- Antiaging agents include 2,6-di-4-methylphenol, 2,6-di-t-butylphenol, butylhydroxyanisole, 2,6-di-t-butyl- ⁇ -dimethylamino-p-cresol, Octadecyl-3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate, styrenated phenol, 2,2′-methylene-bis (6- ⁇ -methyl-benzyl-p-cresol), 4, Butylation of 4'-methylenebis (2,6-di-t-butylphenol), 2,2'-methylene-bis (4-methyl-6-t-butylphenol), alkylated bisphenol, p-cresol and dicyclopentadiene Reaction products, phenolic antioxidants not containing sulfur atoms; 2,2′-thiobis- (4-methyl-6-t-butylphenol) 4,4′-thiobis- (6-tert-butyl-o-cresol), 2,6-di-ter
- the content of the anti-aging agent in the dip molding composition of the present invention is preferably 0.05 to 10 parts by weight, more preferably 0.1 to 5 parts by weight with respect to 100 parts by weight of the synthetic polyisoprene. is there. If this amount is too small, the synthetic polyisoprene may deteriorate. Moreover, when there is too much this quantity, the tensile strength of a dip molded object may fall.
- the method for preparing the dip molding composition of the present invention is not particularly limited. For example, using a disperser such as a ball mill, kneader, or disper, etc., a synthetic polyisoprene latex, sulfur-based vulcanizing agent, vulcanization accelerator, and other zinc oxide and anti-aging agent blended as necessary After preparing an aqueous dispersion of the desired compounding ingredients other than the synthetic polyisoprene latex using the above-mentioned disperser in advance, the aqueous dispersion is mixed with the synthetic polyisoprene latex. The method of doing is mentioned.
- a disperser such as a ball mill, kneader, or disper, etc.
- a synthetic polyisoprene latex sulfur-based vulcanizing agent
- vulcanization accelerator vulcanization accelerator
- other zinc oxide and anti-aging agent blended as necessary
- the aqueous dispersion is mixed with the synthetic polyisoprene late
- the pH of the dip molding composition of the present invention is preferably 7 or more, more preferably in the range of 8 to 12, from the viewpoint of the stability of the dip molding composition. Further, the solid content concentration of the dip molding composition of the present invention is preferably in the range of 15 to 65% by weight because the film thickness at the time of dip molding can be controlled well.
- the dip molding composition of the present invention is preferably aged (also referred to as pre-vulcanization) before being subjected to dip molding.
- pre-vulcanization By performing pre-vulcanization, a dip-molded body having excellent tensile strength and capable of being detached from a mold described later is obtained.
- the time for pre-vulcanization is not particularly limited and depends on the pre-vulcanization temperature, but is preferably 1 to 40 hours, more preferably 5 to 35 hours, and further preferably 10 to 30 hours.
- the pre-vulcanization temperature is preferably 10 to 40 ° C., more preferably 20 to 30 ° C. Since the dip molding composition of the present invention comprises the above-described components, even when the aging temperature is relatively low and the aging time is relatively short as described above, the tensile strength and A dip-molded body excellent in elongation can be provided.
- pre-vulcanization After pre-vulcanization, it is preferably stored at a temperature of preferably 10 to 30 ° C. until it is used for dip molding. When stored at a high temperature, the tensile strength of the resulting dip-molded product may decrease.
- the dip molded body of the present invention is obtained by dip molding the dip molding composition of the present invention.
- a mold is immersed in a dip molding composition, the composition is deposited on the surface of the mold, the mold is then lifted from the composition, and then the composition deposited on the mold surface is dried. Is the method.
- the mold before being immersed in the dip molding composition may be preheated.
- a coagulant can be used as necessary before the mold is immersed in the dip molding composition or after the mold is pulled up from the dip molding composition.
- the method of using the coagulant include a method in which a mold before dipping in a dip molding composition is immersed in a coagulant solution to attach the coagulant to the mold (anode coagulation dipping method), for dip molding
- anode coagulation dipping method there is a method of immersing the mold on which the composition is deposited in a coagulant solution
- the anode adhesion dipping method is preferred in that a dip-formed product with little thickness unevenness can be obtained.
- coagulants include metal halides such as barium chloride, calcium chloride, magnesium chloride, zinc chloride, and aluminum chloride; nitrates such as barium nitrate, calcium nitrate, and zinc nitrate; acetic acid such as barium acetate, calcium acetate, and zinc acetate. Salts; water-soluble polyvalent metal salts such as calcium sulfate, magnesium sulfate, and sulfates such as aluminum sulfate; Of these, calcium salts are preferable, and calcium nitrate is more preferable. These water-soluble polyvalent metal salts can be used alone or in combination of two or more.
- the coagulant is preferably used in the form of an aqueous solution.
- This aqueous solution may further contain a water-soluble organic solvent such as methanol or ethanol, or a nonionic surfactant.
- concentration of the coagulant varies depending on the type of the water-soluble polyvalent metal salt, but is preferably 5 to 50% by weight, more preferably 10 to 30% by weight.
- the deposit formed on the mold is usually dried by heating. What is necessary is just to select drying conditions suitably.
- heating is performed to vulcanize the deposit formed on the mold.
- the heating conditions during vulcanization are not particularly limited, but are preferably 60 to 150 ° C., more preferably 100 to 130 ° C., and preferably 10 to 120 minutes.
- the heating method is not particularly limited, and examples thereof include a method of heating with warm air in an oven and a method of heating by irradiating infrared rays.
- the mold before or after heating the mold on which the dip molding composition is deposited, the mold is washed with water or warm water in order to remove water-soluble impurities (for example, excess surfactant or coagulant). It is preferable.
- the hot water used is preferably 40 ° C. to 80 ° C., more preferably 50 ° C. to 70 ° C.
- the dip-formed body after vulcanization is desorbed from the mold.
- the desorption method include a method of peeling from a mold by hand, a method of peeling by water pressure or compressed air pressure, and the like. If the dip-formed product in the middle of vulcanization has sufficient strength against desorption, it may be desorbed during the vulcanization and then the subsequent vulcanization may be continued.
- the dip-formed body of the present invention is preferably used for gloves because it is excellent in tensile strength and elongation.
- the dip-molded body is a glove
- the glove is made of inorganic fine particles such as talc and calcium carbonate or organic fine particles such as starch particles. It may be dispersed on the surface, an elastomer layer containing fine particles may be formed on the surface of the glove, or the surface layer of the glove may be chlorinated.
- the dip-molded body of the present invention is a medical product such as a nipple for baby bottles, a dropper, a tube, a water pillow, a balloon sac, a catheter, and a condom; a toy such as a balloon, a doll, and a ball; It can also be used for industrial articles such as bags and gas storage bags;
- Weight average molecular weight of polyisoprene 0.1 g of polyisoprene was dissolved in 50 g of tetrahydrofuran to prepare a 0.2 wt% measurement solution. Next, the measurement solution was filtered with a disk filter having a pore size of 0.45 ⁇ m, and measurement was performed with HLC-8220GPC (manufactured by Tosoh Corporation). And about the obtained result, the weight average molecular weight of polyisoprene was calculated
- GPC system HLC-8220GPC (manufactured by Tosoh Corporation) Guard column: Product name “TSKGUARD COLUMN SUPER HZ-L 4.6 ⁇ 35”, manufactured by Tosoh Corporation Measurement column: Product name “TSK-GEL SUPER HM-H 6.0 ⁇ 150”, manufactured by Tosoh Corporation Column temperature: 40 ° C. Solvent: Tetrahydrofuran Flow rate: 0.3 mL / min Detector: RI (polarity (+))
- As the 200 mM sodium phosphate buffer a solution obtained by dissolving 37.02 g of sodium dihydrogen phosphate (anhydrous) and 42.60 g of disodium hydrogen phosphate (anhydrous) in 3 L of ultrapure water was used.
- the measurement solution was filtered with a disk filter (trade name “Mirex LH”, manufactured by Millipore) having a pore diameter of 0.45 ⁇ m, and then measured with an aqueous GPC (gel permeation chromatography).
- the calibration curve which produced the brand name "TSK standard polyethylene oxide” (made by Tosoh Corporation), polyethyleneglycol (made by Wako Pure Chemical Industries), and polyethyleneglycol (made by Kanto Chemical Co., Inc.) as a standard sample. was used to determine the weight average molecular weight of the polymethacrylic acid sodium salt.
- the measurement of aqueous GPC was performed with the following apparatus and conditions.
- Tensile strength and elongation of the dip-molded body were measured based on ASTM D412.
- a film-shaped dip-molded product was punched out with a dumbbell (trade name “Super Dumbbell (model: SDMK-100C)” manufactured by Dumbbell Co., Ltd.) to produce a test piece for measuring tensile strength.
- the test piece was pulled at a tensile speed of 500 mm / min with a Tensilon universal testing machine (trade name “RTG-1210”, manufactured by Orientec Co., Ltd.), tensile strength immediately before break (unit: MPa), elongation just before break (unit: :%).
- Aggregate amount in dip molding composition 200 mesh filtration
- the dip-forming composition solid content concentration: D wt%, weight: E
- the wire mesh was dried in a dryer at 105 ° C. for 2 hours or more, and then the weight (weight: F) of the wire mesh after drying was measured.
- the aggregate amount (% by weight) in the dip molding composition was determined according to the following formula.
- Aggregate amount [(FC) / (D ⁇ E)] ⁇ 10000 (% by weight)
- Production Example 1 (Production of synthetic polyisoprene latex) A synthetic polyisoprene having a weight average molecular weight of 1,300,000 (trade name “NIPOL IR2200L”, manufactured by Nippon Zeon Co., Ltd., isoprene homopolymer, cis bond unit amount 98%) is mixed with cyclohexane, and the temperature is stirred. Was heated to 60 ° C. to dissolve, and a cyclohexane solution (a) of polyisoprene having a viscosity of 12,000 mPa ⁇ s measured with a B-type viscometer was prepared (solid content concentration 8% by weight).
- the product name “Multiline Mixer MS26-MMR-5.5L” is used so that the weight ratio of the cyclohexane solution (a) and the anionic surfactant aqueous solution (b) is 1: 1.5. (Made by Satake Chemical Machinery Co., Ltd.) and then mixed and emulsified at 4100 rpm using the trade name “Milder MDN310” (produced by Taiheiyo Kiko Co., Ltd.) to obtain an emulsion (c). .
- the total feed flow rate of the cyclohexane solution (a) and the anionic surfactant aqueous solution (b) was 2,000 kg / hr, the temperature was 60 ° C., and the back pressure (gauge pressure) was 0.5 MPa. .
- the emulsion (c) obtained above was heated to 80 ° C. under a reduced pressure of ⁇ 0.01 to ⁇ 0.09 MPa (gauge pressure), and cyclohexane was distilled off. A dispersion (d) was obtained.
- the product name “SM5515” manufactured by Dow Corning Toray
- the emulsified liquid (c) is adjusted to 70% by volume or less of the tank volume, and a three-stage inclined paddle blade is used as a stirring blade, and the stirring is slowly performed at 60 rpm. Carried out.
- the obtained aqueous dispersion (d) was used for 4,000 to 5 using a continuous centrifuge (trade name “SRG510”, manufactured by Alfa Laval). Centrifugation at 1,000 G gave a latex (e) of synthetic polyisoprene having a solid concentration of 56% by weight as a light liquid.
- the conditions for the centrifugation are as follows: the solid concentration of the aqueous dispersion (d) before centrifugation is 10% by weight, the flow rate during continuous centrifugation is 1300 kg / hr, and the back pressure (gauge pressure) of the centrifuge is It was 1.5 MPa.
- the total activator content was 3.0 parts per 100 parts synthetic polyisoprene, and the cyclohexane content was 10 ppm.
- the aggregate in latex (e) was not observed.
- Production Example 2 (Production of polymethacrylic acid sodium salt) Distilled water (110 parts) and methacrylic acid (5 parts) were charged into a nitrogen-substituted polymerization reactor equipped with a stirrer, and the temperature was raised to 30 ° C. while stirring. Further, using a container different from the above, 7 parts of distilled water, 0.32 part of sodium formaldehyde sulfoxylate (trade name “SFS”, manufactured by Mitsubishi Gas Chemical Company), ferrous sulfate (trade name “Frost Fe”) (Manufactured by Chubu Kirest Co., Ltd.) was prepared.
- SFS sodium formaldehyde sulfoxylate
- Fe ferrous sulfate
- the obtained aqueous solution of sodium polymethacrylate has a solid content concentration of 11% by weight, a pH of 10, a viscosity measured with a B-type viscometer of 13 mPa ⁇ s, and a weight average of sodium polymethacrylate measured according to the above method.
- the molecular weight was 110,000.
- Example 1 (Dip molding composition) While stirring 178.6 parts (100 parts in terms of synthetic polyisoprene) of the synthetic polyisoprene latex (e) obtained in Production Example 1, an aqueous solution of sodium polymethacrylate obtained in Production Example 2 4.5 Parts (0.5 parts in terms of polymethacrylic acid sodium salt) were added.
- the glass mold coated with the coagulant was then dried in an oven at 70 ° C. Thereafter, the glass mold coated with the coagulant is taken out of the oven, dipped in the above dip-forming composition (f) adjusted to 25 ° C. for 10 seconds, taken out, and dried at room temperature for 60 minutes. A coated glass mold was obtained. And after immersing the glass type
- Example 2 When preparing the dip molding composition, the amount of the polymethacrylic acid sodium salt aqueous solution obtained in Production Example 2 was changed from 4.5 parts to 9 parts (1 part in terms of polymethacrylic acid sodium salt). Except for the above, a dip-molding composition and a film (dip-molded product) were obtained in the same manner as in Example 1 and evaluated in the same manner. The results are shown in Table 1.
- Example 3 When preparing the composition for dip molding, the amount of the polymethacrylic acid sodium salt aqueous solution obtained in Production Example 2 was changed from 4.5 parts to 18 parts (2 parts in terms of polymethacrylic acid sodium salt). Except for the above, a dip-molding composition and a film (dip-molded product) were obtained in the same manner as in Example 1 and evaluated in the same manner. The results are shown in Table 1.
- Comparative Example 1 In preparing the dip molding composition, the dip molding composition and film (dip) were prepared in the same manner as in Example 1 except that the aqueous solution of sodium polymethacrylate obtained in Production Example 2 was not blended. Molded body) was obtained and evaluated in the same manner. The results are shown in Table 1.
- Comparative Example 2 A dip molding composition and a film (dip molded body) were obtained and evaluated in the same manner as in Comparative Example 1 except that the temperature at which the dip molding composition was aged was changed to 35 ° C. It was. The results are shown in Table 1.
- a polycarboxylic acid sodium salt is added to a latex of synthetic polyisoprene having a weight average molecular weight of 10,000 to 5,000,000 in addition to a sulfur vulcanizing agent and a vulcanization accelerator.
- the dip-molding composition thus formed has reduced generation of aggregates after aging (pre-vulcanization), and even when the aging conditions are relatively low and a short time of 25 ° C. and 24 hours. It was possible to give dip-molded bodies excellent in tensile strength and elongation (Examples 1 to 3).
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Abstract
Description
好ましくは、前記ポリカルボン酸および/またはポリカルボン酸の塩が、油溶性重合開始剤を用いて重合された重合体またはその塩である。
好ましくは、前記ポリカルボン酸が、メタクリル酸の単独重合体であり、前記ポリカルボン酸の塩が、メタクリル酸の単独重合体の金属塩であり、前記金属塩が、ナトリウム塩である。
好ましくは、前記ポリカルボン酸および/またはポリカルボン酸の塩の重量平均分子量が1,000~300,000である。
好ましくは、前記ポリカルボン酸および/またはポリカルボン酸の塩の含有量が、前記合成ポリイソプレン100重量部に対して、0.01~20重量部である。
また本発明のディップ成形用組成物は、酸化亜鉛をさらに含有することが好ましい。
本発明で用いる合成ポリイソプレンラテックスは、イソプレンを重合して得られる、重量平均分子量が10,000~5,000,000である合成ポリイソプレンのラテックスである。
本発明のディップ成形用組成物は、ポリカルボン酸および/またはポリカルボン酸の塩を含有する。ポリカルボン酸および/またはポリカルボン酸の塩は、本発明のディップ成形用組成物中において、分散剤として作用する。本発明においては、ポリカルボン酸および/またはポリカルボン酸の塩を配合することにより、熟成している間の粗大凝集物の生成を抑制することができ、しかも、熟成温度を比較的低くし、かつ、熟成時間を比較的短くした場合でも引張強度および伸びに優れたディップ成形体を得ることが可能となる。また、ポリカルボン酸および/またはポリカルボン酸の塩は、人体にアレルギー症状を引き起こすような蛋白質を含んでいないため、得られるディップ成形体を、人体と接触して使用される場合にも優れた安全性を示すものとすることができる。
また、本発明で用いるポリカルボン酸の塩は、これらの(共)重合体中に存在するカルボキシル基または酸無水物基の少なくとも一部が塩を形成しているものである。なお、本発明で用いるポリカルボン酸の塩としては、ナトリウム、カリウム等のアルカリ金属塩;マグネシウム塩;カルシウム、バリウム等のアルカリ土類金属塩;さらに、アンモニウム塩、アミン塩などが例示されるが、これらのなかでも、金属塩が好ましく、アルカリ金属塩がより好ましく、ナトリウム塩がさらに好ましい。金属塩にすることにより、揮発成分による臭気を低減することができる。
なお、ポリカルボン酸、および、ポリカルボン酸の塩の中でも、ポリカルボン酸の塩が好ましい。
芳香族ビニル系モノマーの具体例としては、スチレン、ビニルトルエン、α-メチルスチレン、クマロン、インデン等が挙げられる。
ビニルエーテル系モノマーの具体例としては、メチルビニルエーテル等が挙げられる。
アクリル酸アルキルエステル系モノマーの具体例としては、アクリル酸エチル、メタクリル酸メチル等が挙げられる。
有機パーオキサイドとしては、たとえば、3,5,5-トリメチルヘキサノイルパーオキサイド、ラウロイルパーオキサイド、ベンゾイルパーオキサイドなどのジアシルパーオキサイド;メチルエチルケトンパーオキサイドなどのケトンパーオキサイド;ベンゾイルハイドロパーオキサイド、クメンハイドロパーオキサイド、p-サイメンハイドロパーオキサイド、1,1,3,3-テトラメチルブチルハイドロパーオキサイド、2,5-ジメチルヘキサン-2,5-ジハイドロパーオキサイドなどのハイドロパーオキサイド;t-ブチルパーオキシピバレートなどのパーオキシエステル;ジイソプロピルパーオキシジカーボネート、ジ-2-エチルヘキシルパーオキシジカーボネートなどのパーオキシジカーボネート;などが挙げられる。アゾ化合物としては、2,2-アゾビスイソブチロニトリル、2,2-アゾビス(2-メチルブチロニトリル)、2,2-アゾビス(2,4-ジメチルバレロニトリル)、2,2-アゾビス(4-メトキシ-2,4-ジメチルバレロニトリル)などが挙げられる。
また、水溶性重合開始剤としては、過硫酸カリウム、過硫酸アンモニウムなどが挙げられる。
本発明で用いる硫黄系加硫剤としては、たとえば、粉末硫黄、硫黄華、沈降硫黄、コロイド硫黄、表面処理硫黄、不溶性硫黄等の硫黄;塩化硫黄、二塩化硫黄、モルホリン・ジスルフィド、アルキルフェノール・ジスルフィド、N,N’-ジチオ-ビス(ヘキサヒドロ-2H-アゼピノンー2)、含りんポリスルフィド、高分子多硫化物、2-(4’-モルホリノジチオ)ベンゾチアゾール等の硫黄含有化合物;などが挙げられる。なかでも、硫黄が好ましく使用できる。これらの硫黄系加硫剤は、1種単独でも、2種以上を併用して用いることもできる。
加硫促進剤としては、ディップ成形において通常用いられる加硫促進剤を制限なく用いることができる。加硫促進剤としては、たとえば、ジエチルジチオカルバミン酸、ジブチルジチオカルバミン酸、ジ-2-エチルヘキシルジチオカルバミン酸、ジシクロヘキシルジチオカルバミン酸、ジフェニルジチオカルバミン酸、ジベンジルジチオカルバミン酸などのジチオカルバミン酸類およびそれらの亜鉛塩;2-メルカプトベンゾチアゾール、2-メルカプトベンゾチアゾール亜鉛、2-メルカプトチアゾリン、ジベンゾチアジル・ジスルフィド、2-(2,4-ジニトロフェニルチオ)ベンゾチアゾール、2-(N,N-ジエチルチオ・カルバイルチオ)ベンゾチアゾール、2-(2,6-ジメチル-4-モルホリノチオ)ベンゾチアゾール、2-(4′-モルホリノ・ジチオ)ベンゾチアゾール、4-モルホニリル-2-ベンゾチアジル・ジスルフィド、1,3-ビス(2-ベンゾチアジル・メルカプトメチル)ユリアなどが挙げられる。これらのなかでも、ジエチルジチオカルバミン酸亜鉛、ジブチルジチオカルバミン酸亜鉛、2-メルカプトベンゾチアゾール、2-メルカプトベンゾチアゾール亜鉛が好ましい。これらの加硫促進剤は、1種単独でも、2種以上を併用して用いることもできる。
本発明のディップ成形用組成物は、さらに酸化亜鉛を含有することが好ましい。
本発明のディップ成形用組成物中における、酸化亜鉛の含有量は、特に限定されないが、合成ポリイソプレン100重量部に対して、好ましくは0.1~5重量部、より好ましくは0.2~2重量部である。この量が少なすぎるとディップ成形体の引張強度が低下する傾向があり、逆に多過ぎると、ディップ成形用組成物中の合成ポリイソプレン粒子の安定性が低下し、粗大な凝集物が発生する場合がある。
本発明のディップ成形用組成物の調製方法は、特に限定されない。たとえば、ボールミル、ニーダー、ディスパー等の分散機を用いて、合成ポリイソプレンのラテックスに、硫黄系加硫剤、加硫促進剤、および必要に応じて配合される酸化亜鉛、老化防止剤などのその他の配合剤を混合する方法や、予め上記の分散機を用いて、合成ポリイソプレンのラテックス以外の所望の配合成分の水性分散液を調製した後、該水性分散液を合成ポリイソプレンのラテックスに混合する方法などが挙げられる。
本発明のディップ成形体は、本発明のディップ成形用組成物をディップ成形して得られる。
ディップ成形は、ディップ成形用組成物に型を浸漬し、型の表面に当該組成物を沈着させ、次に型を当該組成物から引き上げ、その後、型の表面に沈着した当該組成物を乾燥させる方法である。なお、ディップ成形用組成物に浸漬される前の型は予熱しておいてもよい。また、型をディップ成形用組成物に浸漬する前、または、型をディップ成形用組成物から引き上げた後、必要に応じて凝固剤を使用できる。
凝固剤の使用方法の具体例としては、ディップ成形用組成物に浸漬する前の型を凝固剤の溶液に浸漬して型に凝固剤を付着させる方法(アノード凝着浸漬法)、ディップ成形用組成物を沈着させた型を凝固剤溶液に浸漬する方法(ティーグ凝着浸漬法)などがあるが、厚みムラの少ないディップ成形体が得られる点で、アノード凝着浸漬法が好ましい。
これらの水溶性多価金属塩は、1種単独で、または2種以上を併用することができる。
ポリイソプレン0.1gを50gのテトラヒドロフランに溶解して、0.2重量%の測定溶液を調製した。次いで、測定溶液を孔径が0.45μmであるディスクフィルタでろ過し、HLC-8220GPC(東ソー社製)にて測定を行った。そして、得られた結果について、ポリスチレンを標準サンプルとして作製した検量線を用いて、ポリイソプレンの重量平均分子量を求めた。なお、GPCの測定は、以下の装置および条件にて測定を行った。
GPCシステム:HLC-8220GPC(東ソー社製)
ガードカラム:商品名「TSKGUARD COLUMN SUPER HZ-L 4.6×35」、東ソー社製
測定カラム:商品名「TSK-GEL SUPER HM-H 6.0×150」、東ソー社製
カラム温度:40℃
溶媒:テトラヒドロフラン
流速:0.3mL/min
検知器:RI(極性(+))
ポリメタクリル酸ナトリウム塩0.1gを200mMのリン酸ナトリウム緩衝液(pH=7)5mLに溶解することで、測定溶液を調製した。なお、200mMのリン酸ナトリウム緩衝液としては、リン酸二水素ナトリウム(無水)37.02g、およびりん酸水素二ナトリウム(無水)42.60gを3Lの超純水に溶解したものを使用した。次いで、測定溶液を孔径が0.45μmであるディスクフィルタ(商品名「マイレクスLH」、ミリポア社製)でろ過し、その後、水系GPC(ゲルパーミエーションクロマトグラフィー)にて測定を行った。そして、得られた結果について、商品名「TSK標準ポリエチレンオキシド」(東ソー社製)、ポリエチレングリコール(和光純薬社製)、および、ポリエチレングリコール(関東化学社製)を標準サンプルとして作製した検量線を用いて、ポリメタクリル酸ナトリウム塩の重量平均分子量を求めた。なお、水系GPCの測定は、以下の装置および条件にて測定を行った。
水系GPCシステム:商品名「2695(Separation Module)」、Waters社製
ガードカラム:商品名「SHODEX OHpack SB-G」、昭和電工社製
測定カラム:商品名「TSKgel GMPW」、東ソー社製を2本直列に接続して使用
カラム温度:40℃
溶媒:200mMリン酸ナトリウム緩衝液(pH=7)
流速:0.5mL/min
検出器:商品名「2414(Refractive Index Detector)」、Waters社製
注入量:50μL
ディップ成形体の引張強度、伸びは、ASTM D412に基づいて測定した。
フィルム状のディップ成形体を、ダンベル(商品名「スーパーダンベル(型式:SDMK-100C)」、株式会社ダンベル製)で打ち抜き、引張強度測定用試験片を作製した。 当該試験片をテンシロン万能試験機(商品名「RTG-1210」、(株)オリエンテック製)で引張速度500mm/minで引っ張り、破断直前の引張強度(単位:MPa)、破断直前の伸び(単位:%)を測定した。
予め重量を測定した200メッシュステンレス製金網(重量:C)を用いてディップ成形用組成物(固形分濃度:D重量%、重量:E)を濾過した。この金網を105℃の乾燥機内で2時間以上乾燥させた後、乾燥後の金網の重量(重量:F)を測定した。次に、ディップ成形用組成物中の凝集物量(重量%)を下記の式にしたがって求めた。
凝集物量=[(F-C)/(D×E)]×10000(重量%)
(合成ポリイソプレンのラテックスの製造)
重量平均分子量が1,300,000の合成ポリイソプレン(商品名「NIPOL IR2200L」、日本ゼオン株式会社製、イソプレンの単独重合体、シス結合単位量98%)をシクロヘキサンと混合し、攪拌しながら温度を60℃に昇温して溶解し、B形粘度計で測定した粘度が12,000mPa・sのポリイソプレンのシクロヘキサン溶液(a)を調製した(固形分濃度8重量%)。
(ポリメタクリル酸ナトリウム塩の製造)
蒸留水110部とメタクリル酸5部を、窒素置換された攪拌機付き重合反応容器に仕込み、撹拌しながら温度を30℃にまで加温した。さらに、上記とは別の容器を用い、蒸留水7部、ナトリウムホルムアルデヒドスルホキシレート(商品名「SFS」、三菱ガス化学社製)0.32部、硫酸第一鉄(商品名「フロストFe」、中部キレスト社製)0.01部からなる溶液を調製した。そして、この溶液を重合反応容器内に添加した後、1,1,3,3-テトラメチルブチルハイドロパーオキサイド(商品名「パーオクタH」、日本油脂社製)0.5部を添加して30℃で1時間反応を行い、さらに70℃で2時間反応させた。そして、反応後、ロータリーエバポレーターで濃縮し、5%水酸化ナトリウムを添加してpHを10に調整することで、ポリメタクリル酸ナトリウム塩の水溶液を得た。得られたポリメタクリル酸ナトリウム塩の水溶液は、固形分濃度が11重量%、pHが10、B形粘度計で測定した粘度が13mPa・s、上記方法に従って測定したポリメタクリル酸ナトリウム塩の重量平均分子量は110,000であった。
(ディップ成形用組成物)
製造例1で得られた合成ポリイソプレンのラテックス(e)178.6部(合成ポリイソプレン換算で100部)を攪拌しながら、製造例2で得られたポリメタクリル酸ナトリウム塩の水溶液4.5部(ポリメタクリル酸ナトリウム塩換算で0.5部)を添加した。次いで、混合物を攪拌しながら、混合物中の合成ポリイソプレン100部に対して、固形分換算で、硫黄1.5部、酸化亜鉛1.5部、ジブチルジチオカルバミン酸亜鉛0.5部、ジエチルジチオカルバミン酸亜鉛0.3部、および2-メルカプトベンゾチアゾール亜鉛0.7部となるように、各配合剤の水分散液を添加した後、水酸化カリウム水溶液を添加して、pHを10.5に調整したディップ成形用組成物(f)を得た。
その後、得られたディップ成形用組成物(f)を、25℃の恒温槽で24時間熟成した。そして、24時間熟成させたディップ成形用組成物(f)について、上述した方法にしたがって、凝集物量(重量%)の測定を行った。結果を表1に示す。
表面がすり加工されたガラス型(直径約5cm、すり部長さ約15cm)を洗浄し、70℃のオーブン内で予備加熱した後、18重量%の硝酸カルシウムおよび0.05重量%のポリオキシエチレンラウリルエーテル(商品名「エマルゲン109P」、花王株式会社製)からなる凝固剤水溶液に5秒間浸漬し、取り出した。
ディップ成形用組成物を調製する際に、製造例2で得られたポリメタクリル酸ナトリウム塩の水溶液の配合量を4.5部から、9部(ポリメタクリル酸ナトリウム塩換算で1部)に変更した以外は、実施例1と同様にして、ディップ成形用組成物およびフィルム(ディップ成形体)を得て、同様に評価を行った。結果を表1に示す。
ディップ成形用組成物を調製する際に、製造例2で得られたポリメタクリル酸ナトリウム塩の水溶液の配合量を4.5部から、18部(ポリメタクリル酸ナトリウム塩換算で2部)に変更した以外は、実施例1と同様にして、ディップ成形用組成物およびフィルム(ディップ成形体)を得て、同様に評価を行った。結果を表1に示す。
ディップ成形用組成物を調製する際に、製造例2で得られたポリメタクリル酸ナトリウム塩の水溶液を配合しなかった以外は、実施例1と同様にして、ディップ成形用組成物およびフィルム(ディップ成形体)を得て、同様に評価を行った。結果を表1に示す。
ディップ成形用組成物の熟成を行う際の温度を35℃に変更した以外は、比較例1と同様にして、ディップ成形用組成物およびフィルム(ディップ成形体)を得て、同様に評価を行った。結果を表1に示す。
ディップ成形用組成物を調製する際に、製造例2で得られたポリメタクリル酸ナトリウム塩の水溶液に代えて、ドデシルベンゼンスルホン酸ナトリウム2部を使用するとともに、ディップ成形用組成物の熟成を行う際の温度を30℃に変更した以外は、実施例1と同様にして、ディップ成形用組成物およびフィルム(ディップ成形体)を得て、同様に評価を行った。結果を表1に示す。
また、ポリカルボン酸ナトリウム塩の代わりに、ドデシルベンゼンスルホン酸ナトリウムを使用した場合にも、熟成(前加硫)後における凝集物の発生が多くなり、また、熟成時の温度を30℃と高くしても、脱型可能な程度に十分な強度を有するディップ成形体を得ることができなかった(比較例3)。
Claims (8)
- 重量平均分子量が10,000~5,000,000である合成ポリイソプレンのラテックスと、ポリカルボン酸および/またはポリカルボン酸の塩と、硫黄系加硫剤と、加硫促進剤とを含有してなるディップ成形用組成物。
- 前記ポリカルボン酸および/またはポリカルボン酸の塩が、油溶性重合開始剤を用いて重合された重合体またはその塩である請求項1に記載のディップ成形用組成物。
- 前記ポリカルボン酸が、メタクリル酸の単独重合体であり、前記ポリカルボン酸の塩が、メタクリル酸の単独重合体の金属塩である請求項1または2に記載のディップ成形用組成物。
- 前記金属塩が、ナトリウム塩である請求項1~3のいずれか1項に記載のディップ成形用組成物。
- 前記ポリカルボン酸および/またはポリカルボン酸の塩の重量平均分子量が1,000~300,000である請求項1~4のいずれか1項に記載のディップ成形用組成物。
- 前記ポリカルボン酸および/またはポリカルボン酸の塩の含有量が、前記合成ポリイソプレン100重量部に対して、0.01~20重量部である請求項1~5のいずれか1項に記載のディップ成形用組成物。
- 酸化亜鉛をさらに含有する請求項1~6のいずれか1項に記載のディップ成形用組成物。
- 請求項1~7のいずれか1項に記載のディップ成形用組成物を、ディップ成形してなるディップ成形体。
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JP2019035065A (ja) * | 2017-08-21 | 2019-03-07 | 住友精化株式会社 | ラテックス組成物の製造方法 |
JP7046611B2 (ja) | 2017-08-21 | 2022-04-04 | 住友精化株式会社 | ラテックス組成物の製造方法 |
JP7066352B2 (ja) | 2017-08-21 | 2022-05-13 | 住友精化株式会社 | 塗膜及びその製造方法 |
JP2023500155A (ja) * | 2019-11-07 | 2023-01-04 | コッサン エスディーエヌ.ビーエイチディー. | 浸漬コーティングプロセスにおいてゴム物品を製造するために使用されるポリマー/無機複合粒子配合物及び該配合物を使用するゴム物品の製造方法 |
JP7234463B2 (ja) | 2019-11-07 | 2023-03-07 | コッサン エスディーエヌ.ビーエイチディー. | 浸漬コーティングプロセスにおいてゴム物品を製造するために使用されるポリマー/無機複合粒子配合物及び該配合物を使用するゴム物品の製造方法 |
WO2023181837A1 (ja) * | 2022-03-23 | 2023-09-28 | 日本ゼオン株式会社 | ラテックス組成物およびディップ成形体 |
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JPWO2015046391A1 (ja) | 2017-03-09 |
US9637621B2 (en) | 2017-05-02 |
US20160168366A1 (en) | 2016-06-16 |
EP3029100B1 (en) | 2019-01-16 |
TW201516094A (zh) | 2015-05-01 |
EP3029100A4 (en) | 2017-06-28 |
SG11201600966XA (en) | 2016-03-30 |
JP6358262B2 (ja) | 2018-07-18 |
EP3029100A1 (en) | 2016-06-08 |
MY183214A (en) | 2021-02-18 |
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