WO2023043234A1 - 중합체 조성물, 이의 제조방법, 이를 포함하는 딥 성형용 라텍스 조성물 및 성형품 - Google Patents
중합체 조성물, 이의 제조방법, 이를 포함하는 딥 성형용 라텍스 조성물 및 성형품 Download PDFInfo
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- WO2023043234A1 WO2023043234A1 PCT/KR2022/013808 KR2022013808W WO2023043234A1 WO 2023043234 A1 WO2023043234 A1 WO 2023043234A1 KR 2022013808 W KR2022013808 W KR 2022013808W WO 2023043234 A1 WO2023043234 A1 WO 2023043234A1
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- UTOVMEACOLCUCK-SNAWJCMRSA-N (e)-4-butoxy-4-oxobut-2-enoic acid Chemical compound CCCCOC(=O)\C=C\C(O)=O UTOVMEACOLCUCK-SNAWJCMRSA-N 0.000 description 2
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- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 description 2
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- ONDPHDOFVYQSGI-UHFFFAOYSA-N zinc nitrate Chemical compound [Zn+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ONDPHDOFVYQSGI-UHFFFAOYSA-N 0.000 description 2
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- TVWBTVJBDFTVOW-UHFFFAOYSA-N 2-methyl-1-(2-methylpropylperoxy)propane Chemical compound CC(C)COOCC(C)C TVWBTVJBDFTVOW-UHFFFAOYSA-N 0.000 description 1
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- YYRMJZQKEFZXMX-UHFFFAOYSA-N calcium;phosphoric acid Chemical compound [Ca+2].OP(O)(O)=O.OP(O)(O)=O YYRMJZQKEFZXMX-UHFFFAOYSA-N 0.000 description 1
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- AFZSMODLJJCVPP-UHFFFAOYSA-N dibenzothiazol-2-yl disulfide Chemical compound C1=CC=C2SC(SSC=3SC4=CC=CC=C4N=3)=NC2=C1 AFZSMODLJJCVPP-UHFFFAOYSA-N 0.000 description 1
- FJBFPHVGVWTDIP-UHFFFAOYSA-N dibromomethane Chemical compound BrCBr FJBFPHVGVWTDIP-UHFFFAOYSA-N 0.000 description 1
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- 230000001939 inductive effect Effects 0.000 description 1
- 239000003999 initiator Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910001629 magnesium chloride Inorganic materials 0.000 description 1
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 1
- 235000019341 magnesium sulphate Nutrition 0.000 description 1
- 229910001507 metal halide Inorganic materials 0.000 description 1
- 150000005309 metal halides Chemical group 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 239000011859 microparticle Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910017464 nitrogen compound Inorganic materials 0.000 description 1
- 150000002830 nitrogen compounds Chemical class 0.000 description 1
- 239000002736 nonionic surfactant Substances 0.000 description 1
- KZCOBXFFBQJQHH-UHFFFAOYSA-N octane-1-thiol Chemical compound CCCCCCCCS KZCOBXFFBQJQHH-UHFFFAOYSA-N 0.000 description 1
- SRSFOMHQIATOFV-UHFFFAOYSA-N octanoyl octaneperoxoate Chemical compound CCCCCCCC(=O)OOC(=O)CCCCCCC SRSFOMHQIATOFV-UHFFFAOYSA-N 0.000 description 1
- 150000001451 organic peroxides Chemical class 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- JRKICGRDRMAZLK-UHFFFAOYSA-L peroxydisulfate Chemical compound [O-]S(=O)(=O)OOS([O-])(=O)=O JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- KNBRWWCHBRQLNY-UHFFFAOYSA-N piperidine-1-carbothioylsulfanyl piperidine-1-carbodithioate Chemical compound C1CCCCN1C(=S)SSC(=S)N1CCCCC1 KNBRWWCHBRQLNY-UHFFFAOYSA-N 0.000 description 1
- 229920002223 polystyrene Polymers 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
- 239000002244 precipitate Substances 0.000 description 1
- FZYCEURIEDTWNS-UHFFFAOYSA-N prop-1-en-2-ylbenzene Chemical group CC(=C)C1=CC=CC=C1.CC(=C)C1=CC=CC=C1 FZYCEURIEDTWNS-UHFFFAOYSA-N 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 description 1
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229940052367 sulfur,colloidal Drugs 0.000 description 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 1
- 239000002426 superphosphate Substances 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000000080 wetting agent Substances 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
- 239000004711 α-olefin Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/12—Polymerisation in non-solvents
- C08F2/16—Aqueous medium
- C08F2/22—Emulsion polymerisation
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F236/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds
- C08F236/02—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds
- C08F236/04—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds conjugated
- C08F236/12—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds conjugated with nitriles
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L13/00—Compositions of rubbers containing carboxyl groups
- C08L13/02—Latex
-
- 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
- C08L9/02—Copolymers with acrylonitrile
- C08L9/04—Latex
Definitions
- the present invention relates to a polymer composition applicable as a latex stabilizer of a latex composition for dip molding, a method for preparing the same, a latex composition for dip molding with improved latex stability including the same, and a molded article molded therefrom with improved comfort and tensile properties. .
- natural rubber has been mainly used as a raw material for products requiring elasticity such as industrial, medical and food gloves, balloons and condoms.
- natural rubber has been replaced with nitrile-based rubber instead of natural rubber due to side effects that cause serious protein allergy in some users.
- Nitrile-based rubber has high chemical resistance, and is particularly used in work gloves used by users who handle organic solvents, or gloves for medical and food use.
- nitrile-based rubber gloves are generally manufactured from latex for dip molding through dip molding. At this time, if the stability of the latex for dip molding is low, coagulum is generated, and the coagulum generated increases the defective rate of the finally manufactured dip molded product, causing a decrease in productivity, and in serious cases, the dip molding itself. There is a problem that makes it impossible.
- a nitrile-based rubber glove which is a dip-molded product made from latex for dip molding, has a disadvantage in that softness is inferior to that of a glove made from natural rubber. This causes a decrease in wearing comfort when wearing gloves, and in particular, when used as surgical gloves, it is not a sufficient substitute for natural rubber gloves. Therefore, a method for improving the softness of the glove is required.
- Patent Document 1 KR 10-2014-0053859 A
- the problem to be solved in the present invention is to improve the storage stability and low-temperature stability of the latex composition for dip molding, as well as the softness of the molded article therefrom, in order to solve the problems mentioned in the background art of the above invention. is to improve the wearing comfort.
- the present invention has been made to solve the problems of the prior art, and to improve the storage stability and low-temperature stability of the latex composition for dip molding, a polymer composition applicable as a latex stabilizer of the latex composition for dip molding and its preparation It aims to provide a method.
- an object of the present invention is to provide a latex composition for dip molding with improved latex stability, particularly storage stability and low-temperature stability, by including the polymer composition.
- an object of the present invention is to provide a molded article molded from the latex composition for dip molding, improved softness, excellent wearing comfort, and excellent tensile properties.
- the present invention provides a polymer composition, a method for preparing the polymer composition, a latex composition for dip molding and a molded article.
- the present invention includes a polymer dispersed in a solvent, wherein the polymer includes a conjugated diene monomer unit, an ethylenically unsaturated nitrile monomer unit, and an ethylenically unsaturated acid monomer unit, and the polymer has a weight average molecular weight of 5,000 g/mol or more and 50,000 g/mol or less, and a glass transition temperature of -34°C or more and 33°C or less.
- the present invention provides the polymer composition according to (1) above, wherein the solvent is an aqueous solvent.
- the polymer is 40% by weight or more and 75% by weight or less of the conjugated diene-based monomer unit, 10% by weight or more and 50% by weight or less of the ethylenically unsaturated nitrile-based monomer unit, and 10% by weight or more and 50% by weight or less of ethylenically unsaturated acid monomer units.
- the present invention provides the polymer composition according to any one of (1) to (3) above, wherein the polymer has a weight average molecular weight of 7,000 g/mol or more and 46,000 g/mol or less.
- the present invention provides the polymer composition according to any one of (1) to (4) above, wherein the polymer has a glass transition temperature of -28°C or more and 24°C or less.
- the present invention provides the polymer composition according to any one of (1) to (5) above, wherein the polymer composition has a pH of 7.0 or more and 10.0 or less at 25°C.
- the present invention includes the step (S10) of preparing a polymer latex containing a polymer by emulsion polymerization of a conjugated diene monomer, an ethylenically unsaturated nitrile monomer, and an ethylenically unsaturated acid monomer in a solvent, and the above (S10 )
- the polymer polymerized in step has a weight average molecular weight of 5,000 g/mol or more and 50,000 g/mol or less, and a glass transition temperature of -34 °C or more and 33 °C or less.
- the emulsion polymerization in the step (S10) is carried out by introducing a molecular weight modifier in an amount of 0.8 parts by weight or more and 8.0 parts by weight or less based on 100 parts by weight of the total monomer content.
- a method for preparing a polymer composition is provided.
- the present invention includes a carboxylic acid-modified nitrile-based copolymer latex and the polymer composition according to any one of (1) to (6), wherein the carboxylic acid-modified nitrile-based copolymer latex is a carboxylic acid-modified nitrile-based copolymer It provides a latex composition for dip molding, wherein the carboxylic acid-modified nitrile-based copolymer includes a conjugated diene-based monomer unit, an ethylenically unsaturated nitrile-based monomer unit, and an ethylenically unsaturated acid monomer unit.
- the present invention provides a molded article comprising the layer derived from the latex composition for dip molding according to (10) or (11) above.
- the polymer composition according to the present invention can be applied as a latex stabilizer for a latex composition for dip molding, and can improve latex stability, particularly storage stability and low-temperature stability, of a latex composition for dip molding including the polymer composition.
- the molded article according to the present invention is molded from the latex composition for dip molding, and has improved softness, excellent wearing comfort, and excellent tensile properties.
- the term 'monomer unit' may represent a component, structure, or material itself derived from a monomer, and as a specific example, during polymerization of a polymer, the input monomer participates in the polymerization reaction to form a repeating unit in the polymer. it could mean
- the term 'polymer' may include both a homopolymer formed by polymerization of one type of monomer and a copolymer formed by copolymerization of two types of monomers.
- the terms 'latex' and 'emulsion' may mean that a polymer or copolymer polymerized by polymerization exists in a dispersed form in water, and specific examples include a polymer or rubber phase polymerized by emulsion polymerization. It may mean that the microparticles of the copolymer exist in a colloidal form dispersed in water, and in the present invention, 'latex' and 'emulsion' may be used interchangeably.
- composition' includes reaction products and decomposition products formed from the materials of the composition, as well as mixtures of materials containing the composition.
- the term 'derived layer' may indicate a layer formed from a polymer or copolymer, and as a specific example, when manufacturing a dip molded product, the polymer or copolymer is attached, fixed, and/or polymerized on a dip mold to form a polymer or copolymer. It may mean a layer formed from a copolymer.
- the present invention provides a polymer composition applicable as a latex stabilizer of a latex composition for dip molding.
- the polymer composition may be an alkali soluble polymer composition, and as a specific example, it may be an alkali soluble emulsion polymer, that is, an alkali soluble resin (ASR).
- ASR alkali soluble resin
- the polymer composition may exist in a latex state.
- the polymer composition includes a polymer dispersed in a solvent, the polymer includes a conjugated diene-based monomer unit, an ethylenically unsaturated nitrile-based monomer unit, and an ethylenically unsaturated acid monomer unit,
- the polymer may have a weight average molecular weight of 5,000 g/mol or more and 50,000 g/mol or less, and a glass transition temperature of -34 °C or more and 33 °C or less.
- the polymer composition may exist in a latex state, and accordingly, the polymer may be present in a dispersed form in a solvent.
- the polymer composition may be prepared by emulsion polymerization, and thus the solvent may be an aqueous solvent that may be used in emulsion polymerization.
- the aqueous solvent may be water, and the water may be ion-exchanged water or distilled water.
- the polymer may include a conjugated diene-based monomer unit, an ethylenically unsaturated nitrile-based monomer unit, and an ethylenically unsaturated acid monomer unit.
- Conventionally known alkali-soluble resins generally contain an acrylate-based monomer as a main monomer.
- the alkali-soluble resin containing such an acrylate-based monomer has low compatibility with the carboxylic acid-modified nitrile-based copolymer in the carboxylic acid-modified nitrile-based copolymer latex included in the latex composition for dip molding, It is not suitable for application as a latex stabilizer.
- the polymer of the present invention is characterized by comprising a monomer unit derived from the same monomer or a monomer of the same series as the carboxylic acid-modified nitrile-based copolymer, and accordingly, the latex of the latex composition for dip molding. It is suitable for use as a stabilizer and can simultaneously improve mechanical properties such as wearability and tensile properties of molded products.
- the conjugated diene-based monomers for forming the conjugated diene-based monomer unit are 1,3-butadiene, 2,3-dimethyl-1,3-butadiene, 2-ethyl-1,3- It may be at least one selected from the group consisting of butadiene, 1,3-pentadiene, and isoprene, and as specific examples, it may be 1,3-butadiene and isoprene, and as more specific examples, it may be 1,3-butadiene.
- the ethylenically unsaturated nitrile-based monomers forming the ethylenically unsaturated nitrile-based monomer units are acrylonitrile, methacrylonitrile, fumaronitrile, ⁇ -chloronitrile and ⁇ -cyanoethyl It may be at least one selected from the group consisting of acrylonitrile, and as specific examples, it may be acrylonitrile and methacrylonitrile, and as more specific examples, it may be acrylonitrile.
- the ethylenically unsaturated acid monomer forming the ethylenically unsaturated acid monomer unit may be an ethylenically unsaturated monomer containing an acidic group such as a carboxyl group, a sulfonic acid group, or an acid anhydride group, and specific examples include acrylic acid, ethylenically unsaturated carboxylic acid monomers such as methacrylic acid, itaconic acid, maleic acid and fumaric acid; polycarboxylic anhydrides such as maleic anhydride and citraconic anhydride; ethylenically unsaturated sulfonic acid monomers such as styrene sulfonic acid; It may be at least one selected from the group consisting of ethylenically unsaturated polycarboxylic acid partial ester monomers such as monobutyl fumarate, monobutyl maleate and mono-2-hydroxypropyl maleate, and more specific examples
- itaconic acid it may be one or more selected from the group consisting of maleic acid and fumaric acid, a more specific example may be methacrylic acid.
- the ethylenically unsaturated acid monomer may be used in the form of a salt such as an alkali metal salt or an ammonium salt during polymerization.
- the polymer contains 40 wt% or more and 75 wt% or less of conjugated diene-based monomer units, 10 wt% or more and 50 wt% or less of ethylenically unsaturated nitrile-based monomer units, and 10 wt% of ethylenically unsaturated acid monomer units. It may contain % to 50% by weight, and within this range, the desired glass transition temperature in the present invention may be satisfied, and a balance between comfort and tensile properties may be maintained.
- the polymer may include 40% by weight or more, 45% by weight or more, 50% by weight or more, 55% by weight or more, or 60% by weight or more of conjugated diene-based monomer units, In addition, it may include 75% by weight or less, 70% by weight or less, 65% by weight or less, or 60% by weight or less, and at the same time adjusting the glass transition temperature within this range, for dip molding including a polymer composition It is possible to improve mechanical properties such as tensile properties of a molded article molded from the latex composition.
- the polymer contains ethylenically unsaturated nitrile monomer units in an amount of 10 wt% or more, 11 wt% or more, 12 wt% or more, 13 wt% or more, 14 wt% or more, 15 wt% or more, 16% by weight or more, 17% by weight or more, 18% by weight or more, 19% by weight or more, or 20% by weight or more, and also 50% by weight or less, 45% by weight or less, 40% by weight or less, 35% by weight or less It may include less than 30% by weight, less than 25% by weight, less than 24% by weight, less than 23% by weight, less than 22% by weight, less than 21% by weight, or less than 20% by weight, within this range At the same time as controlling the glass transition temperature, it is possible to simultaneously improve mechanical properties such as comfort and tensile properties of molded articles molded from the latex composition for dip molding including the polymer composition.
- the polymer contains 10% by weight or more, 11% by weight or more, 12% by weight or more, 13% by weight or more, 14% by weight or more, 15% by weight or more, 16% by weight or more of ethylenically unsaturated acid monomer units It may include at least 17% by weight, at least 18% by weight, at least 19% by weight, or at least 20% by weight, and also at 50% by weight or less, 45% by weight or less, 40% by weight or less, 35% by weight or less % or less, 30 wt% or less, 25 wt% or less, 24 wt% or less, 23 wt% or less, 22 wt% or less, 21 wt% or less, or 20 wt% or less, and within this range, glass At the same time as controlling the transition temperature, it is possible to simultaneously improve mechanical properties such as comfort and tensile properties of a molded article molded from the latex composition for dip molding including the polymer composition.
- the polymer may have a weight average molecular weight of 5,000 g/mol or more and 50,000 g/mol or less.
- the polymer has a weight average molecular weight of 5,000 g/mol or more, 5,500 g/mol or more, 6,000 g/mol or more, 6,500 g/mol or more, 7,000 g/mol or more, 7,500 g/mol or more, or 8,000 g/mol greater than, 8,500 g/mol, greater than 9,000 g/mol, greater than 9,500 g/mol, greater than 10,000 g/mol, greater than 10,500 g/mol, greater than 11,000 g/mol, greater than 11,500 g/mol, or greater than 12,000 g/mol 50,000 g/mol or less, 49,000 g/mol or less, 48,000 g/mol or less, 47,000 g/mol or less, 46,000 g/mol or less, 45,000 g/mol or less, 40,000 g/mol or less, 3
- the weight average molecular weight of the polymer when the weight average molecular weight of the polymer is lower than the range described above, entanglement between the polymer and the carboxylic acid-modified nitrile-based copolymer in the latex composition for dip molding is lowered, resulting in a molded article molded from the latex composition for dip molding. There is a problem in that mechanical properties such as tensile properties are deteriorated.
- the weight average molecular weight of the polymer is higher than the range described above, when preparing the polymer composition, the stability of the latex is lowered due to the increase in viscosity, and it is difficult to substantially complete the polymerization, thereby making it impossible to prepare the polymer composition.
- the polymer may have a glass transition temperature of -34 °C or more and 33 °C or less.
- the polymer has a glass transition temperature of -34 ° C or higher, -33 ° C or higher, -32 ° C or higher, -30 ° C or higher, -29 ° C or higher, -28 ° C or higher, -27 ° C or higher, -26 ° C or higher, It may be -25 °C or more, -20 °C or more, -15 °C or more, -14 °C or more, -13 °C or more, or -12 °C or more, and also 33 °C or less, 32 °C or less, 31 °C or less, 30 °C 29 °C or less, 28 °C or less, 27 °C or less, 26 °C or less, 25 °C or less, 24 °C or less, 23 °C or less, 22 °C or less,
- the glass transition temperature of the polymer when the glass transition temperature of the polymer is lower than the above-described range, there is a problem in that the tensile strength of a molded article molded from the latex composition for dip molding is lowered, and when the glass transition temperature of the polymer is higher than the above-described range, for dip molding As the molded article molded from the latex composition becomes hard, there is a problem in that the wearing feeling is lowered. Therefore, by adjusting the glass transition temperature of the polymer within the range described above, it is possible to simultaneously improve mechanical properties such as comfort and tensile properties of a molded article molded from the latex composition for dip molding. At this time, the glass transition temperature can be adjusted from the content of each monomeric unit of the polymer, in particular, the content of the conjugated diene-based monomeric unit, and can be measured using differential scanning calorimetry (DSC).
- DSC differential scanning calorimetry
- the polymer composition may have a pH of 7.0 or more and 10.0 or less at 25 °C.
- the additive polymer composition may have a pH of 7.0 or more, 7.1 or more, 7.2 or more, 7.3 or more, 7.4 or more, 7.5 or more, 7.6 or more, 7.7 or more, 7.8 or more, 7.9 or more, or 8.0 or more at 25 ° C.
- the present invention provides a method for preparing a polymer composition for preparing the above polymer composition.
- the method for preparing the polymer composition comprises the steps of emulsion polymerization of a conjugated diene monomer, an ethylenically unsaturated nitrile monomer and an ethylenically unsaturated acid monomer in a solvent to prepare a polymer latex containing a polymer ( S10), the polymer polymerized in step (S10) may have a weight average molecular weight of 5,000 g/mol or more and 50,000 g/mol or less, and a glass transition temperature of -34 °C or more and 33 °C or less.
- the solvent, conjugated diene monomer, ethylenically unsaturated nitrile monomer, and ethylenically unsaturated acid monomer may be the same as those described above.
- the step (S10) is a step for preparing the polymer composition in a latex state, and may be performed by emulsion polymerization.
- the emulsion polymerization of step (S10) may be carried out in the presence of an emulsifier and a molecular weight regulator.
- the emulsion polymerization of step (S10) may be carried out in the presence of an emulsifier, and the emulsifier is composed of an anionic surfactant, a nonionic surfactant, a cationic surfactant, and an amphoteric surfactant. It may be at least one selected from the group, and specific examples include at least one anionic surfactant selected from the group consisting of alkylbenzenesulfonic acid salts, aliphatic sulfonic acid salts, higher alcohol sulfuric acid ester salts, ⁇ -olefin sulfonic acid salts and alkyl ether sulfuric acid ester salts.
- an emulsifier is composed of an anionic surfactant, a nonionic surfactant, a cationic surfactant, and an amphoteric surfactant. It may be at least one selected from the group, and specific examples include at least one anionic surfactant selected from the group consisting of alkylbenzenesulf
- the emulsion polymerization in the step (S10) may be carried out by adding an emulsifier in an amount of 1.0 parts by weight or more and 5.0 parts by weight or less based on 100 parts by weight of the total monomer content.
- the emulsifier 1.0 parts by weight or more, 1.5 parts by weight or more, 2.0 parts by weight or more, or 2.5 parts by weight or more may be added, and also 5.0 parts by weight or less, 4.5 parts by weight or less, 4.0 parts by weight or less, 3.5 parts by weight or less Or less, 3.0 parts by weight or less, or 2.5 parts by weight or less may be added, and polymerization stability may be more excellent within this range.
- the emulsion polymerization of step (S10) may be carried out in the presence of a molecular weight regulator, wherein the molecular weight regulator is ⁇ -methylstyrene dimer; mercaptans such as t-dodecyl mercaptan, n-dodecyl mercaptan and octyl mercaptan; halogenated hydrocarbons such as carbon tetrachloride, methylene chloride and methylene bromide; It may be at least one selected from the group consisting of sulfur-containing compounds such as tetraethyl thiuram disulfide, dipentamethylene thiuram disulfide, and diisopropylxantogen disulfide, and may be t-dodecylmercaptan as a specific example.
- the molecular weight regulator is ⁇ -methylstyrene dimer
- mercaptans such as t-dodecyl
- the emulsion polymerization in step (S10) may be carried out by adding a molecular weight modifier in an amount of 0.8 parts by weight or more and 8.0 parts by weight or less based on 100 parts by weight of the total monomer content.
- a molecular weight modifier in an amount of 0.8 parts by weight or more and 8.0 parts by weight or less based on 100 parts by weight of the total monomer content.
- the emulsion polymerization in step (S10) may be initiated by introducing a polymerization initiator, and the polymerization initiator may be a radical initiator, and specific examples include sodium persulfate, potassium persulfate, and inorganic peroxides such as ammonium sulfate, potassium superphosphate and hydrogen peroxide; t-butyl peroxide, cumene hydroperoxide, p-mentane hydroperoxide, di-t-butyl peroxide, t-butylcumyl peroxide, acetyl peroxide, isobutyl peroxide, octanoyl peroxide, dibenzoyl peroxide oxide, organic peroxides such as 3,5,5-trimethylhexanol peroxide and t-butyl peroxy isobutyrate; It may be at least one selected from the group consisting of nitrogen compounds such as azobis isobutyronitrile,
- the emulsion polymerization of the step (S10) may be carried out by adding a polymerization initiator in an amount of 0.01 parts by weight or more and 2.0 parts by weight or less based on 100 parts by weight of the total monomer content.
- the polymerization conversion rate is obtained by taking a certain amount of samples from the reacting composition at regular time intervals, measuring the solid content in the sample, and then calculating the It may be calculated by Equation 1.
- Equation 1 Ms is the weight of the dried copolymer, Mo is the sum of the weights of the emulsifier and polymerization initiator, Mp is the weight of the 100% polymerized copolymer, and M'o is the sum of the weights of the emulsifier and polymerization initiator.
- the method for preparing the polymer composition includes the steps of adding a pH adjusting agent to the polymer latex prepared in the step (S10) (S20); And it may include a step (S30) of obtaining the pH-adjusted polymer latex in the emulsion phase in the step (S20).
- the step (S20) is a step for adjusting the pH of the polymer latex prepared in the step (S10), the step (S20) to the step obtained from the step (S30)
- the pH of the polymer composition at 25°C can be adjusted to 7.0 or more and 10.0 or less.
- the pH adjusting agent may be a basic compound, and may be an alkali hydroxide and/or an aqueous ammonia solution as a specific example, and may be sodium hydroxide or potassium hydroxide as a more specific example.
- the step (S30) is a step of obtaining a polymer latex in an emulsion phase, and may include a deodorization step to remove unreacted monomers and residual components, if necessary.
- the polymer composition obtained from the step (S30) may be an alkali soluble polymer composition, and as a specific example, an alkali soluble emulsion polymer, that is, an alkali soluble resin (ASR). Accordingly, the polymer composition may be in a latex state. can exist
- the present invention provides a latex composition for dip molding for producing molded articles by dip molding.
- the latex composition for dip molding includes a carboxylic acid-modified nitrile-based copolymer latex and the polymer composition, and the carboxylic acid-modified nitrile-based copolymer latex comprises a carboxylic acid-modified nitrile-based copolymer.
- the carboxylic acid-modified nitrile-based copolymer may include a conjugated diene-based monomer unit, an ethylenically unsaturated nitrile-based monomer unit, and an ethylenically unsaturated acid monomer unit.
- the carboxylic acid-modified nitrile-based copolymer latex may be present in a latex state in which the carboxylic acid-modified nitrile-based copolymer is dispersed in a solvent, and the solvent may be an aqueous solvent.
- the aqueous solvent may be water, and the water may be ion-exchanged water or distilled water.
- the carboxylic acid-modified nitrile-based copolymer may include a monomer unit derived from the same monomer or a monomer of the same series as the polymer, and specific examples include conjugated diene. It may include an ethylenically unsaturated nitrile-based monomer unit, an ethylenically unsaturated nitrile-based monomer unit, and an ethylenically unsaturated acid monomer unit.
- the conjugated diene-based monomers for forming the conjugated diene-based monomer unit of the carboxylic acid-modified nitrile-based copolymer are 1,3-butadiene, 2,3-dimethyl-1,3-butadiene , 2-ethyl-1,3-butadiene, may be at least one selected from the group consisting of 1,3-pentadiene and isoprene, specific examples, may be 1,3-butadiene or isoprene, more specific examples, 1, It may be 3-butadiene.
- the conjugated diene-based monomer forming the conjugated diene-based monomer unit of the polymer and the conjugated diene-based monomer forming the conjugated diene-based monomer unit of the carboxylic acid-modified nitrile-based copolymer may be the same or different from each other. .
- the carboxylic acid-modified nitrile-based copolymer contains 35% to 80% by weight, 40% to 75% by weight, or 45% to 70% by weight of the repeating unit derived from the conjugated diene-based monomer. %, and within this range, the molded article molded from the latex composition for dip molding comprising the carboxylic acid-modified nitrile-based copolymer latex containing the carboxylic acid-modified nitrile-based copolymer is flexible and has excellent comfort and At the same time, there is an effect of excellent oil resistance and tensile strength.
- the ethylenically unsaturated nitrile monomer forming the ethylenically unsaturated nitrile monomer unit of the carboxylic acid-modified nitrile copolymer is acrylonitrile, methacrylonitrile, fumaronitrile, ⁇ It may be at least one selected from the group consisting of -chloronitrile and ⁇ -cyano ethyl acrylonitrile, and as specific examples, it may be acrylonitrile and methacrylonitrile, and more specific examples, it may be acrylonitrile.
- the ethylenically unsaturated nitrile monomer forming the ethylenically unsaturated nitrile monomer unit of the polymer and the ethylenically unsaturated nitrile monomer forming the ethylenically unsaturated nitrile monomer unit of the carboxylic acid-modified nitrile copolymer are They may be the same as or different from each other.
- the carboxylic acid-modified nitrile-based copolymer contains the ethylenically unsaturated nitrile-based monomer unit in an amount of 20% to 50% by weight, 20% to 45% by weight, or 25% to 40% by weight %, and within this range, molded articles molded from the latex composition for dip molding comprising the carboxylic acid-modified nitrile-based copolymer latex composition containing the carboxylic acid-modified nitrile-based copolymer are flexible and have excellent wearing comfort. At the same time, there is an effect of excellent oil resistance and tensile strength.
- the ethylenically unsaturated acid monomer forming the ethylenically unsaturated acid monomer unit of the carboxylic acid-modified nitrile-based copolymer is an ethylenically unsaturated acid group containing an acidic group such as a carboxyl group, a sulfonic acid group, or an acid anhydride group.
- carboxylic acid monomers such as acrylic acid, methacrylic acid, itaconic acid, maleic acid and fumaric acid
- polycarboxylic anhydrides such as maleic anhydride and citraconic anhydride
- itaconic acid it may be one or more selected from the group consisting of maleic acid and fumaric acid, a more specific example may be methacrylic acid.
- the ethylenically unsaturated acid monomer may be used in the form of a salt such as an alkali metal salt or an ammonium salt during polymerization.
- the ethylenically unsaturated acid monomer forming the ethylenically unsaturated acid monomer unit of the polymer and the ethylenically unsaturated acid monomer forming the ethylenically unsaturated acid monomer unit of the carboxylic acid-modified nitrile copolymer are the same or may be different.
- the carboxylic acid-modified nitrile-based copolymer contains 0.1% to 10% by weight, 0.5% to 9% by weight, or 1% to 8% by weight of repeating units derived from the ethylenically unsaturated acid monomer.
- a molded article molded from the latex composition for dip molding comprising the carboxylic acid-modified nitrile-based copolymer latex composition containing the carboxylic acid-modified nitrile-based copolymer is flexible and comfortable to wear. At the same time as being excellent, there is an effect of excellent tensile strength.
- the latex composition for dip molding is for performing dip molding using the carboxylic acid-modified nitrile-based copolymer latex, adjusting the pH of the carboxylic acid-modified nitrile-based copolymer latex, , It may include a crosslinking agent composition for inducing crosslinking during dip molding.
- the latex composition for dip molding according to the present invention includes the polymer composition together, so that the latex stability of the latex composition for dip molding, particularly storage stability and low-temperature stability, can be improved.
- the latex composition for dip molding includes 1 part by weight or more and 15 parts by weight or less based on solid content of the polymer composition based on 100 parts by weight based on solid content of the carboxylic acid-modified nitrile-based copolymer latex.
- the polymer composition is 1 part by weight or more, 2 parts by weight or more, 3 parts by weight or more, 4 parts by weight or more, or 5 parts by weight or more based on the solid content based on 100 parts by weight based on the solid content of the carboxylic acid-modified nitrile-based copolymer latex.
- the cross-linking agent composition may be for forming a cross-linking agent-derived cross-linking portion through a cross-linking reaction with respect to the carboxylic acid-modified nitrile-based copolymer.
- the crosslinking agent composition may include a vulcanizing agent and a vulcanization accelerator, and more specifically, may include a vulcanizing agent, a vulcanization accelerator, and zinc oxide.
- the vulcanizing agent is for vulcanizing the latex composition for dip molding, and may be sulfur, and specific examples include sulfur such as powdered sulfur, precipitated sulfur, colloidal sulfur, surface-treated sulfur, and insoluble sulfur.
- the amount of the vulcanizing agent may be 0.1 part by weight to 10 parts by weight, or 1 part by weight to 5 parts by weight based on 100 parts by weight (based on solid content) of the total content of the carboxylic acid-modified nitrile-based copolymer in the latex composition for dip molding. , within this range, there is an effect of excellent crosslinking ability by vulcanization.
- the vulcanization accelerator is 2-mercaptobenzothiazole (MBT, 2-mercaptobenzothiazole), 2,2-dithiobisbenzothiazole-2-sulfenamide (MBTS, 2,2-dithiobisbenzothiazole -2-sulfenamide), N-cyclohexylbenzothiasol-2-sulfenamide (CBS, N-cyclohexylbenzothiasole-2-sulfenamide), 2-morpholinothiobenzothiazole (MBS, 2-morpholinothiobenzothiazole), tetramethylthio Tetramethylthiuram monosulfide (TMTM), tetramethylthiuram disulfide (TMTD), zinc diethyldithiocarbamate (ZDEC), zinc di-n-butyldithiocarbamate (ZDBC) , zinc di-n-butyldithiocarbamate), diphenylguanidine
- the content of the vulcanization accelerator may be 0.1 part by weight to 10 parts by weight, or 0.5 part by weight to 5 parts by weight based on 100 parts by weight (based on solid content) of the total content of the carboxylic acid-modified nitrile-based copolymer in the latex composition for dip molding. , within this range, there is an effect of excellent crosslinking ability by vulcanization.
- the zinc oxide performs an ionic bond with the carboxyl group of the carboxylic acid-modified nitrile-based copolymer in the latex composition for dip molding, and the carboxylic acid-modified nitrile-based copolymer or the carboxylic acid-modified nitrile It may be a cross-linking agent for forming a cross-linking portion through ionic bonding between the based copolymers.
- the content of the zinc oxide may be 0.1 part by weight to 5 parts by weight, or 0.5 part by weight to 4 parts by weight based on 100 parts by weight (based on solid content) of the total content of the carboxylic acid-modified nitrile-based copolymer in the latex composition for dip molding. , excellent crosslinking ability within this range, excellent latex stability, and excellent tensile strength and flexibility of manufactured molds.
- the latex composition for dip molding may have a solid content (concentration) of 5% to 40% by weight, 8% to 35% by weight, or 10% to 33% by weight, Within this range, latex transport efficiency is excellent, and storage stability is excellent by preventing an increase in latex viscosity.
- the latex composition for dip molding may have a pH of 9 to 12, 9 to 11, or 9.5 to 10.5 at 25 ° C., and excellent processability and productivity when manufacturing a dip molded product within this range. It works.
- the pH of the latex composition for dip molding may be adjusted by adding the pH adjusting agent described above.
- the latex composition for dip molding may further include additives such as a pigment such as titanium dioxide, a filler such as silica, a thickener, and a pH adjuster, if necessary.
- additives such as a pigment such as titanium dioxide, a filler such as silica, a thickener, and a pH adjuster, if necessary.
- the present invention provides a molded article.
- the molded article may include a layer derived from a latex composition for dip molding.
- the molded article may be a dip molded article prepared by dip molding the latex composition for dip molding, or may be a molded article including a layer derived from the latex composition for dip molding formed from the latex composition for dip molding by dip molding.
- the molded article manufacturing method for molding the molded article may include a step of dipping the latex composition for dip molding by a direct dipping method, an anode adhesion dipping method, a Teague adhesion dipping method, or the like. It can be carried out by an adhesion dipping method, and in this case, there is an advantage of obtaining a dip molded article having a uniform thickness.
- the method for manufacturing a molded product includes attaching a coagulant to a dip mold (S100); Forming a layer derived from the latex composition for dip molding, that is, a dip molding layer by immersing the dip molding mold to which the coagulant is attached in the latex composition for dip molding (S200); and heating the dip molding layer to cross-link the latex composition for dip molding (S300).
- the step (S100) is a step of attaching the coagulant to the surface of the dip mold by immersing the dip mold in a coagulant solution to form a coagulant in the dip mold, the coagulant solution is a coagulant is dissolved in water, alcohol, or a mixture thereof, and the content of the coagulant in the coagulant solution is 5% to 75% by weight, 5% to 50% by weight, or 10% to 40% by weight based on the total content of the coagulant solution. may be %.
- the coagulant is a metal halide such as barium chloride, calcium chloride, magnesium chloride, zinc chloride and aluminum chloride; nitrates such as barium nitrate, calcium nitrate and zinc nitrate; acetates such as barium acetate, calcium acetate and zinc acetate; And it may be at least one selected from the group consisting of sulfates such as calcium sulfate, magnesium sulfate, and aluminum sulfate, and may be calcium chloride or calcium nitrate as specific examples.
- sulfates such as calcium sulfate, magnesium sulfate, and aluminum sulfate
- the step (S100) is a step of immersing the dip molding mold in the coagulant solution for 5 seconds or more to attach the coagulant to the dip molding mold, taking it out, and then drying at 50 ° C to 150 ° C. may further include.
- the dip molding mold to which the coagulant is attached is immersed in the latex composition for dip molding according to the present invention, taken out, and dip molded in the dip molding mold to form the dip molding layer. It may be a step of forming a layer.
- immersion may be performed for 5 seconds or longer to form a dip molding layer in the dip molding mold.
- the step (S300) heats the dip molding layer formed in the dip molding mold to evaporate the liquid component, and crosslinks the latex composition for dip molding to cure it in order to obtain a dip molding product. It may be a step to At this time, when using the latex composition for dip molding according to the present invention, vulcanization of the crosslinking agent composition included in the latex composition for dip molding and/or crosslinking by ionic bonding may be performed.
- the heating is performed by first heating at 70 ° C. to 150 ° C. for 1 minute to 10 minutes, and then secondarily heating at 100 ° C. to 180 ° C. for 5 minutes to 30 minutes. can At this time, after the first heating and before performing the second heating, a step of leaching by soaking in water or hot water for 10 seconds to 10 minutes may be further included.
- the molded article may be gloves such as surgical gloves, examination gloves, industrial gloves and household gloves, condoms, catheters, or health care products.
- a 10 L high-pressure reactor equipped with a thermometer, a condenser, an inlet for nitrogen gas, and an inlet for continuously introducing monomers, emulsifiers, and polymerization initiators was used.
- 20 parts by weight of acrylonitrile, 60 parts by weight of 1,3-butadiene and methacrylonitrile based on 100 parts by weight of the total content of acrylonitrile, 1,3-butadiene and methacrylic acid 100 parts by weight of a monomer mixture composed of 20 parts by weight of acrylic acid, 2.5 parts by weight of sodium dodecyl benzenesulfonate as an emulsifier, 3.5 parts by weight of t-dodecyl mercaptan as a molecular weight modifier, and 250 parts by weight of ion-exchanged water were added, and the temperature inside the reactor was The temperature was raised to 40 °C.
- polymerization is initiated by adding 1.0 parts by weight of potassium permanate as a polymerization initiator, and 1.0 parts by weight of sodium dimethyldithiocarbamate is added to stop polymerization at the time when the polymerization conversion rate is 95%.
- Latex was prepared.
- potassium hydroxide was added to the polymer latex to adjust the pH at 25° C. to 8.5, and a deodorization process was performed to remove unreacted monomers, thereby obtaining a polymer composition.
- a coagulant solution was prepared by mixing 18% by weight of calcium nitrate, 81.9% by weight of water, and 0.1% by weight of a wetting agent (manufactured by Huntsman Corporation, Australia, product name Teric 320).
- the hand-shaped ceramic mold was immersed in the coagulant solution for 10 seconds, taken out, and dried at 80° C. for 4 minutes, and then the coagulant was applied to the hand-shaped mold.
- the hand-shaped mold coated with the coagulant was immersed in the obtained latex composition for dip molding for 10 seconds, then taken out, dried at 80° C. for 2 minutes, and soaked in water for 30 seconds for leaching. Again, after crosslinking the mold at 110 DEG C for 20 minutes, the crosslinked dip molded layer was peeled off from the hand-shaped mold to obtain a glove-shaped dip molded product.
- Example 1 when preparing the polymer composition, 15 parts by weight of acrylonitrile instead of 20 parts by weight, 70 parts by weight of 1,3-butadiene instead of 60 parts by weight, and 15 parts by weight of methacrylic acid instead of 20 parts by weight were added. Except for the above, a polymer composition was obtained in the same manner as in Example 1, and a latex composition for dip molding and a dip molded article were obtained using the polymer composition.
- Example 1 when preparing the polymer composition, acrylonitrile was added at 35 parts by weight instead of 20 parts by weight, 1,3-butadiene at 40 parts by weight instead of 60 parts by weight, and methacrylic acid at 25 parts by weight instead of 20 parts by weight. Except for the above, a polymer composition was obtained in the same manner as in Example 1, and a latex composition for dip molding and a dip molded article were obtained using the polymer composition.
- Example 1 when preparing the polymer composition, except that 6.0 parts by weight of t-dodecyl mercaptan was added instead of 3.5 parts by weight, the polymer composition was obtained in the same manner as in Example 1, and using this A latex composition for dip molding and a dip molded article were obtained.
- Example 1 when preparing the polymer composition, except that 1.0 parts by weight of t-dodecyl mercaptan was added instead of 3.5 parts by weight, the polymer composition was obtained in the same manner as in Example 1, and using this A latex composition for dip molding and a dip molded article were obtained.
- Example 1 when preparing the latex composition for dip molding, a dip molded product was obtained in the same manner as in Example 1, except that 10 parts by weight of the polymer composition was added instead of 5 parts by weight (based on solid content). .
- Example 1 when preparing the latex composition for dip molding, a dip molded article was obtained in the same manner as in Example 1, except that 20 parts by weight of the polymer composition was added instead of 5 parts by weight (based on solid content). .
- Example 1 when preparing the polymer composition, except that 7.5 parts by weight of t-dodecyl mercaptan as a molecular weight modifier was added instead of 3.5 parts by weight, the polymer composition was obtained in the same manner as in Example 1, Using this, a latex composition for dip molding and a dip molded article were obtained.
- Example 1 when preparing the polymer composition, except that 0.85 parts by weight of t-dodecyl mercaptan as a molecular weight regulator was added instead of 3.5 parts by weight, the polymer composition was obtained in the same manner as in Example 1, Using this, a latex composition for dip molding and a dip molded article were obtained.
- Example 1 when preparing the polymer composition, acrylonitrile was added at 13 parts by weight instead of 20 parts by weight, 1,3-butadiene at 74 parts by weight instead of 60 parts by weight, and methacrylic acid at 13 parts by weight instead of 20 parts by weight. Except for the above, a polymer composition was obtained in the same manner as in Example 1, and a latex composition for dip molding and a dip molded article were obtained using the polymer composition.
- Example 1 when preparing the polymer composition, acrylonitrile was added at 33 parts by weight instead of 20 parts by weight, 1,3-butadiene at 37 parts by weight instead of 60 parts by weight, and methacrylic acid at 30 parts by weight instead of 20 parts by weight. Except for the above, a polymer composition was obtained in the same manner as in Example 1, and a latex composition for dip molding and a dip molded article were obtained using the polymer composition.
- Example 1 when preparing the polymer composition, acrylonitrile was added at 35 parts by weight instead of 20 parts by weight, 1,3-butadiene at 35 parts by weight instead of 60 parts by weight, and methacrylic acid at 30 parts by weight instead of 20 parts by weight. Except for the above, a polymer composition was obtained in the same manner as in Example 1, and a latex composition for dip molding and a dip molded article were obtained using the polymer composition.
- Example 1 when preparing the polymer composition, acrylonitrile was added at 10 parts by weight instead of 20 parts by weight, 1,3-butadiene at 80 parts by weight instead of 60 parts by weight, and methacrylic acid at 10 parts by weight instead of 20 parts by weight. Except for the above, a polymer composition was obtained in the same manner as in Example 1, and a latex composition for dip molding and a dip molded article were obtained using the polymer composition.
- Example 1 the polymer composition was prepared in the same manner as in Example 1, except that 0.5 parts by weight of t-dodecyl mercaptan was added instead of 3.5 parts by weight, but the stability of the latex was improved due to the increase in viscosity during polymerization. It deteriorated and the polymer composition could not be prepared.
- Example 1 when preparing the polymer composition, except that 10.0 parts by weight of t-dodecyl mercaptan was added instead of 3.5 parts by weight, the polymer composition was obtained in the same manner as in Example 1, and using this A latex composition for dip molding and a dip molded article were obtained.
- Example 1 when preparing the latex composition for dip molding, a dip molded article was obtained in the same manner as in Example 1, except that the polymer composition was not added.
- the glass transition temperature and weight average molecular weight of the polymer were measured by the following methods, and the composition of each monomer added during the preparation of the polymer composition, the molecular weight modifier It is shown in Tables 1 to 3 below along with the input content and the input content of the polymer composition used when preparing the latex composition for dip molding.
- Glass transition temperature (Tg, °C) Samples in the form of films were prepared by drying the polymer compositions prepared in Examples 1 to 11 and Comparative Examples 1 to 4 in an oven at 130 °C for 1 hour. For about 1 mg of the prepared sample, the glass transition temperature was measured while raising the temperature from -70 ° C to 70 ° C at a heating rate of 20 ° C / min using a differential scanning calorimetry, TA Instrument's DSC 2920. measured.
- Weight average molecular weight (Mw, g / mol) films obtained by drying the polymer compositions prepared in Examples 1 to 11 and Comparative Examples 1 to 4 in a constant temperature and humidity room (25 ° C., 50% relative humidity) for 24 hours After dissolving in tetrahydrofuran (THF), only the sol part dissolved in tetrahydrofuran was obtained, and gel permeation chromatography (GPC, gel permeation chromatography, Waters 2414 Refractive Index Detector with external column heater; Waters 1515 Isocractic pump, Waters 717 plus Autosampler), the weight average molecular weight was measured under the following conditions.
- GPC gel permeation chromatography
- Low-temperature stability 2 parts by weight of the polymer composition prepared in Examples 1 to 11 and Comparative Examples 1 to 5 in 100 parts by weight (based on solid content) of carboxylic acid-modified nitrile copolymer latex (LG Chem, NL105) (based on solid content) was added and mixed at room temperature for 2 hours. After storing it at -5 °C for 24 hours, the content of the resulting coagulum was measured. At this time, the lower the measured coagulum content, the better the low-temperature stability.
- Tensile strength (kgf/mm 2 ) load value (kgf)/(thickness (mm) ⁇ width (mm))
- Elongation (%) (Length of test piece after stretching / Length of test piece before stretching) ⁇ 100
- 500% modulus MPa: In accordance with ASTM D638 using the test piece prepared for the tensile strength measurement, a crosshead speed of 500 After pulling at mm/min, the 500% modulus, which is the tensile strength when the specimen was stretched 5 times compared to the total length of the specimen, was measured. At this time, the lower the measured 500% modulus means the softer and the better the fit.
- the latex composition for dip molding comprising the polymer composition of Examples 1 to 11 of the present invention has low temperature stability compared to the latex composition for dip molding of Comparative Example 5 without the polymer composition. I was able to confirm that it was excellent.
- dip molded articles molded from the latex compositions for dip molding of Examples 1 to 11 of the present invention are equivalent in tensile strength, elongation, and 500% modulus to the dip molded articles molded from the latex compositions for dip molding of Comparative Example 5. It was confirmed that the above level was indicated.
- the latex compositions for dip molding of Examples 1 to 5 and 8 of the present invention and the dip molded articles molded therefrom have excellent low-temperature stability and dip molded products by including the polymer composition in an appropriate amount. It was confirmed that the tensile properties of the molded article were significantly improved.
- the dip molded article molded from the latex composition for dip molding of Comparative Example 1 including the polymer composition having a glass transition temperature higher than the range defined in the present invention has poor tensile properties and a lower wearing comfort than Comparative Example 5. was able to confirm that
- the polymer composition according to the present invention can be applied as a latex stabilizer of the latex composition for dip molding, and can improve the latex stability, particularly storage stability and low-temperature stability, of the latex composition for dip molding including the same.
- the molded product molded from this has improved softness, excellent wearing comfort, and excellent tensile properties.
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Abstract
Description
구분 | 실시예 | ||||||||
1 | 2 | 3 | 4 | 5 | 6 | 7 | |||
단량체 | AN1) | (중량부) | 20 | 15 | 35 | 20 | 20 | 20 | 20 |
BD2) | (중량부) | 60 | 70 | 40 | 60 | 60 | 60 | 60 | |
MAA3) | (중량부) | 20 | 15 | 25 | 20 | 20 | 20 | 20 | |
분자량 조절제 | TDDM4) | (중량부) | 3.5 | 3.5 | 3.5 | 6.0 | 1.0 | 3.5 | 3.5 |
중합체 | Tg | (℃) | -12.0 | -27.8 | 23.4 | -12.0 | -12.0 | -12.0 | -12.0 |
Mw | (g/mol) | 12,000 | 12,200 | 11,800 | 7,000 | 42,000 | 12,000 | 12,000 | |
투입 함량 | (중량부) | 5 | 5 | 5 | 5 | 5 | 10 | 20 | |
1) AN: 아크릴로니트릴 2) BD: 1,3-부타디엔 3) MAA: 메타크릴산 4) TDDM: t-도데실 머캅탄 |
구분 | 실시예 | |||||
8 | 9 | 10 | 11 | |||
단량체 | AN1) | (중량부) | 20 | 20 | 13 | 33 |
BD2) | (중량부) | 60 | 60 | 74 | 37 | |
MAA3) | (중량부) | 20 | 20 | 13 | 30 | |
분자량 조절제 | TDDM4) | (중량부) | 7.5 | 0.85 | 3.5 | 3.5 |
중합체 | Tg | (℃) | -12.0 | -12.0 | -33.6 | 32.4 |
Mw | (g/mol) | 5,600 | 49,400 | 12,300 | 11,500 | |
투입 함량 | (중량부) | 5 | 5 | 5 | 5 | |
1) AN: 아크릴로니트릴 2) BD: 1,3-부타디엔 3) MAA: 메타크릴산 4) TDDM: t-도데실 머캅탄 |
구분 | 비교예 | ||||||
1 | 2 | 3 | 4 | 5 | |||
단량체 | AN1) | (중량부) | 35 | 10 | 20 | 20 | - |
BD2) | (중량부) | 35 | 80 | 60 | 60 | - | |
MAA3) | (중량부) | 30 | 10 | 20 | 20 | - | |
분자량 조절제 | TDDM4) | (중량부) | 3.5 | 3.5 | 0.5 | 10.0 | - |
중합체 | Tg | (℃) | 36.4 | -41.9 | 중합 완료 불가 | -12.0 | - |
Mw | (g/mol) | 11,600 | 12,500 | 4,200 | - | ||
투입 함량 | (중량부) | 5 | 5 | 5 | 0 | ||
1) AN: 아크릴로니트릴 2) BD: 1,3-부타디엔 3) MAA: 메타크릴산 4) TDDM: t-도데실 머캅탄 |
구분 | 실시예 | |||||||
1 | 2 | 3 | 4 | 5 | 6 | 7 | ||
저온 안정성 | (ppm) | <10 | <10 | <10 | <10 | <10 | <10 | <10 |
인장강도 | (MPa) | 38.5 | 36.7 | 39.4 | 37.1 | 39.1 | 38.2 | 30.2 |
신율 | (%) | 645 | 642 | 625 | 647 | 630 | 660 | 690 |
500 % 모듈러스 | (MPa) | 13.8 | 14.5 | 15.0 | 13.5 | 14.6 | 13.3 | 11.7 |
구분 | 실시예 | ||||
8 | 9 | 10 | 11 | ||
저온 안정성 | (ppm) | <10 | 20 | <10 | <10 |
인장강도 | (MPa) | 36.2 | 36.5 | 35.9 | 35.7 |
신율 | (%) | 638 | 605 | 650 | 595 |
500 % 모듈러스 | (MPa) | 14.0 | 15.1 | 13.2 | 17.3 |
구분 | 비교예 | |||||
1 | 2 | 3 | 4 | 5 | ||
저온 안정성 | (ppm) | <10 | <10 | 측정불가 | <10 | 100 |
인장강도 | (MPa) | 34.2 | 33.5 | 34.3 | 35.0 | |
신율 | (%) | 580 | 680 | 615 | 630 | |
500 % 모듈러스 | (MPa) | 18.5 | 11.5 | 14.2 | 15.2 |
Claims (12)
- 용매에 분산된 중합체를 포함하고,상기 중합체는 공액디엔계 단량체 단위, 에틸렌성 불포화 니트릴계 단량체 단위 및 에틸렌성 불포화산 단량체 단위를 포함하고,상기 중합체는 중량평균 분자량이 5,000 g/mol 이상 50,000 g/mol 이하이고, 유리전이온도가 -34 ℃ 이상 33 ℃ 이하인 중합체 조성물.
- 제1항에 있어서,상기 용매는 수계 용매인 것인 중합체 조성물.
- 제1항에 있어서,상기 중합체는 공액디엔계 단량체 단위 40 중량% 이상 75 중량% 이하, 에틸렌성 불포화 니트릴계 단량체 단위 10 중량% 이상 50 중량% 이하, 및 에틸렌성 불포화산 단량체 단위 10 중량% 이상 50 중량% 이하를 포함하는 것인 중합체 조성물.
- 제1항에 있어서,상기 중합체는 중량평균 분자량이 7,000 g/mol 이상 46,000 g/mol 이하인 것인 중합체 조성물.
- 제1항에 있어서,상기 중합체는 유리전이온도가 -28 ℃ 이상 24 ℃ 이하인 것인 중합체 조성물.
- 제1항에 있어서,상기 중합체 조성물은 25 ℃의 pH가 7.0 이상 10.0 이하인 것인 중합체 조성물.
- 용매 중에서, 공액디엔계 단량체, 에틸렌성 불포화 니트릴계 단량체 및 에틸렌성 불포화산 단량체를 유화 중합하여 중합체를 포함하는 중합체 라텍스를 제조하는 단계(S10)를 포함하고,상기 (S10) 단계에서 중합된 중합체는 중량평균 분자량이 5,000 g/mol 이상 50,000 g/mol 이하이고, 유리전이온도가 -34 ℃ 이상 33 ℃ 이하인 것인 중합체 조성물 제조방법.
- 제7항에 있어서,상기 (S10) 단계의 유화 중합은 전체 단량체 함량 100 중량부에 대하여 분자량 조절제를 0.8 중량부 이상 8.0 중량부 이하의 함량으로 투입하여 실시하는 것인 중합체 조성물 제조방법.
- 제7항에 있어서,상기 (S10) 단계에서 제조된 중합체 라텍스에 pH 조절제를 투입하는 단계(S20); 및상기 (S20) 단계에서 pH가 조절된 중합체 라텍스를 에멀젼 상으로 수득하는 단계(S30)를 포함하는 중합체 조성물 제조방법.
- 카르본산 변성 니트릴계 공중합체 라텍스 및 제1항 내지 제6항 중 어느 한 항에 따른 중합체 조성물을 포함하고,상기 카르본산 변성 니트릴계 공중합체 라텍스는 카르본산 변성 니트릴계 공중합체를 포함하며,상기 카르본산 변성 니트릴계 공중합체는 공액디엔계 단량체 단위, 에틸렌성 불포화 니트릴계 단량체 단위 및 에틸렌성 불포화산 단량체 단위를 포함하는 것인 딥 성형용 라텍스 조성물.
- 제10항에 있어서,상기 카르본산 변성 니트릴계 공중합체 라텍스의 고형분 기준 100 중량부에 대하여 상기 중합체 조성물을 고형분 기준으로 1 중량부 이상 15 중량부 이하로 포함하는 것인 딥 성형용 라텍스 조성물.
- 제10항에 따른 딥 성형용 라텍스 조성물 유래층을 포함하는 성형품.
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KR20140053859A (ko) | 2011-03-31 | 2014-05-08 | 제온 코포레이션 | 고포화 니트릴 고무 조성물 및 고무 가교물 |
KR20150106228A (ko) * | 2014-03-11 | 2015-09-21 | 주식회사 엘지화학 | 카르본산 변성 니트릴계 공중합체 라텍스 조성물을 포함하는 딥 성형용 조성물 및 이로부터 제조된 딥 성형품 |
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