WO2011004805A1 - ポリクロロプレンラテックス組成物及びその製造方法並びに成形体 - Google Patents
ポリクロロプレンラテックス組成物及びその製造方法並びに成形体 Download PDFInfo
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- WO2011004805A1 WO2011004805A1 PCT/JP2010/061441 JP2010061441W WO2011004805A1 WO 2011004805 A1 WO2011004805 A1 WO 2011004805A1 JP 2010061441 W JP2010061441 W JP 2010061441W WO 2011004805 A1 WO2011004805 A1 WO 2011004805A1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F36/00—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds
- C08F36/02—Homopolymers and 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
- C08F36/04—Homopolymers and 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
- C08F36/14—Homopolymers and 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 containing elements other than carbon and hydrogen
- C08F36/16—Homopolymers and 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 containing elements other than carbon and hydrogen containing halogen
- C08F36/18—Homopolymers and 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 containing elements other than carbon and hydrogen containing halogen containing chlorine
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/12—Polymerisation in non-solvents
- C08F2/16—Aqueous medium
- C08F2/22—Emulsion polymerisation
- C08F2/24—Emulsion polymerisation with the aid of emulsifying agents
- C08F2/26—Emulsion polymerisation with the aid of emulsifying agents anionic
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
- C08K5/098—Metal salts of carboxylic acids
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/36—Sulfur-, selenium-, or tellurium-containing compounds
- C08K5/41—Compounds containing sulfur bound to oxygen
- C08K5/42—Sulfonic acids; Derivatives thereof
Definitions
- the present invention relates to a polychloroprene latex composition, a method for producing the same, and a molded body using the composition.
- the present invention relates to a polychloroprene latex composition used for dip molding, a method for producing the same, and a molded body obtained by dip molding the composition.
- Polychloroprene latex has excellent properties such as mechanical strength, weather resistance, heat resistance, and chemical resistance, so it can be used for materials for immersion moldings such as gloves, fiber treatment agents, paper processing agents, adhesives, adhesives, and elasticity. Widely used in fields such as asphalt (modified asphalt) and elastic cement.
- natural rubber was generally used as a material for immersion molded bodies such as gloves.
- natural rubber contains proteins that cause allergic symptoms, if it is used directly on skin, it may cause symptoms such as hives and rashes. This problem is particularly important in the medical field, and there is a demand for materials that do not cause allergic symptoms in disposable medical gloves such as surgical gloves.
- JP 2000-198881 A Japanese Patent Laid-Open No. 2003-41410 JP 2007-106994 A
- the conventional techniques described above have the following problems. That is, the deproteinized natural rubber latex described in Patent Document 1 requires a process for deproteinizing natural rubber, and even if a ketone is blended, sufficient mechanical strength may not be obtained. There is a problem.
- the nitrile butadiene rubber latex described in Patent Document 2 has a problem that the texture of the obtained immersion molded article is hard, and it is difficult to use for a long time, particularly when used for gloves.
- polychloroprene latex has a problem that it is inferior in flexibility and stability over time, and Patent Document 3 attempts to improve these properties, but it is not sufficient. Polychloroprene latex also has a problem that it is difficult to release from the mold during immersion molding.
- the present invention mainly provides a polychloroprene latex composition, a method for producing the same, and a molded body that can provide a molded article having good mold release properties and excellent flexibility during immersion molding. Objective.
- the polychloroprene latex composition according to the present invention is a polychloroprene latex obtained by emulsion polymerization in the presence of 3 parts by mass or less of an alkali metal salt of rosin acid per 100 parts by mass of a monomer: 100 parts by mass, and alkyl diphenyl ether And an alkali metal salt of disulfonic acid: 0.01 to 1.0 part by mass.
- 1 to 30% by mass of 2,3-dichloro-1,3-butadiene may be contained in 100 parts by mass of the monomer.
- the method for producing a polychloroprene latex composition according to the present invention comprises a monomer in the presence of 3 parts by mass or less of an alkali metal salt of rosin acid and an alkali metal salt of alkyldiphenyl ether disulfonic acid per 100 parts by mass of the monomer.
- Emulsion polymerization is performed to obtain a polychloroprene latex containing 0.01 to 1.0 part by mass of an alkali metal salt of alkyldiphenyl ether disulfonic acid with respect to 100 parts by mass of the polychloroprene latex.
- the method for producing another polychloroprene latex composition according to the present invention includes polychloroprene after emulsion polymerization of a monomer using an alkali metal salt of rosin acid of 3 parts by mass or less per 100 parts by mass of the monomer as an emulsifier.
- Latex Alkali metal salt of alkyldiphenyl ether disulfonic acid: 0.01 to 1.0 part by mass is added to 100 parts by mass of latex.
- an alkali metal salt of alkyldiphenyl ether disulfonic acid may be added after emulsion polymerization of the monomer using an alkali metal salt of rosin acid as an emulsifier.
- Emulsion polymerization was started with the initial monomer addition amount of 10 to 50% by mass of the total monomer, and the polymerization was completed from the point that polymerization progressed to a monomer conversion rate of between 1 and 40%. Until the rate is reached, the remaining monomer cooled to a temperature lower than the polymerization temperature can be continuously added into the polymerization system to carry out emulsion polymerization.
- the molded body according to the present invention is obtained by dip molding the above-described polychloroprene latex composition, such as a glove.
- the present invention it is possible to improve the mold releasability from the mold during dip molding, and to obtain a dip molded body having excellent flexibility.
- the polychloroprene latex composition (hereinafter also simply referred to as a composition) according to an embodiment of the present invention has an alkali metal salt of alkyldiphenyl ether disulfonic acid: 0.01-1. Contains 0 parts by weight.
- the polychloroprene latex is the main component of the polychloroprene latex composition of the present embodiment.
- a polychloroprene latex obtained by emulsion polymerization in the presence of an alkali metal salt of rosin acid exceeding 3 parts by mass per 100 parts by mass of the monomer is used, the resulting immersion molded articles (films) are likely to stick to each other. Therefore, it becomes difficult to use. Therefore, in the composition of this embodiment, polychloroprene latex obtained by emulsion polymerization in the presence of 3 parts by mass or less of an alkali metal salt of rosin acid per 100 parts by mass of the monomer is used.
- the polychloroprene latex blended in the composition of the present embodiment contains 1 to 30% by mass of 2,3-dichloro-1,3-butadiene in 100 parts by mass of the monomer to be emulsion polymerized. It is desirable. Thereby, crystal resistance can be improved and the softness
- Alkali metal salt of alkyl diphenyl ether disulfonic acid is added to reduce poor emulsification and formation of aggregates of polychloroprene latex and obtain a homogeneous immersion molded product.
- the content of the alkali metal salt of alkyldiphenyl ether disulfonic acid is 0.01 to 1.0 part by mass per 100 parts by mass of the polychloroprene latex.
- the content of the alkali metal salt of the alkyldiphenyl ether disulfonic acid is less than 0.01 parts by mass with respect to 100 parts by mass of the polychloroprene latex, the effect of reducing the above-described emulsification failure and aggregate formation is insufficient. I can't get it.
- the content of the alkali metal salt of alkyl diphenyl ether disulfonic acid exceeds 1.0 part by mass, the coagulation property of the latex is not improved, and a homogeneous immersion molded article cannot be obtained.
- the above-described polychloroprene latex composition is obtained by emulsion polymerization of a monomer in the presence of an alkali metal salt of rosin acid and an alkali metal salt of alkyldiphenyl ether disulfonic acid, or in the presence of an alkali metal salt of rosin acid.
- the emulsion is obtained by emulsion polymerization and then adding an alkali metal salt of alkyldiphenyl ether disulfonic acid.
- chloroprene is emulsion-polymerized to obtain a polychloroprene latex.
- chloroprene alone, or a monomer copolymerizable with chloroprene and chloroprene in the presence of an emulsifying / dispersing agent, emulsion polymerization is carried out by adding a polymerization initiator or a chain transfer agent, and the desired polymerization conversion is achieved. When the rate is reached, a polymerization terminator is added to terminate the polymerization.
- chloroprene refers to 2-chloro-1,3-butadiene.
- the monomer copolymerizable with chloroprene is one that is copolymerized with chloroprene to adjust the properties of the resulting polychloroprene latex, such as methyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, etc.
- 2,3-dichloro-1,3-butadiene and chloroprene are particularly good because they have good copolymerizability with chloroprene and are easy to adjust characteristics such as crystal resistance and flexibility. It is preferable to use it as a monomer to be copolymerized.
- the amount of 2,3-dichloro-1,3-butadiene in all monomers is preferably 1 to 30% by mass, Preferably, it is 5 to 20% by mass.
- the amount of 2,3-dichloro-1,3-butadiene in the total monomer is less than 1% by mass, the effect of improving the crystal resistance may not be obtained, and when it exceeds 30% by mass. In some cases, the crystallization of the polymer proceeds too much, and the flexibility is lowered.
- a normal alkali metal salt of rosin acid can be used as an emulsifying / dispersing agent used for emulsion polymerization.
- the amount of the alkali metal salt of rosin acid used in the emulsion polymerization is 3 parts by mass or less per 100 parts by mass of the monomer.
- the amount of alkali metal salt of rosin acid is more than 3 parts by mass, the polychloroprene latex tends to stick due to residual rosin acid, and sticking to the mold during dip molding may cause molding defects, The surface of the obtained immersion molded body becomes sticky.
- alkali metal salt of rosin acid can also be used together as an emulsifier / dispersant.
- emulsifying / dispersing agents that can be used in combination with alkali metal salts of rosin acid include carboxylic acid type, sulfonic acid type, and sulfuric acid ester type.
- Examples include, but are not limited to, phonates, condensates of sodium naltalin sulfonate and formaldehyde, polyoxyethylene acyl ethers, polyoxyethylene alkylphenols, sorbitan fatty acid esters, polyoxyethylene acyl esters, and the like.
- the polymerization initiator used for emulsion polymerization is not particularly limited, and those used for usual emulsion polymerization of chloroprene can be used. Specifically, persulfates such as potassium persulfate and organic peroxides such as 3-butyl hydroperoxide are preferably used.
- the chain transfer agent is not particularly limited, and those used for usual emulsion polymerization of chloroprene can be used. Specifically, long chain alkyl mercaptans such as n-dodecyl mercaptan and tert-dodecyl mercaptan, dialkylxanthogen disulfides such as diisopropylxanthogen disulfide and diethylxanthogen disulfide, and known chain transfer agents such as iodoform can be used. .
- the polymerization temperature of the chloroprene latex is not particularly limited, and can generally be in a range where emulsion polymerization is performed (0 to 55 ° C.), but it is preferable to perform polymerization in the range of 30 to 50 ° C. . Thereby, the temporal stability of the flexibility of the obtained immersion molded body is improved.
- the polymerization pass-through rate of chloroprene latex is preferably 60 to 95%, more preferably 80 to 90%.
- the polymerization pass-through rate is less than 60%, the solid content of the polymer latex is lowered, and productivity may be deteriorated.
- the polymerization time may be prolonged, resulting in a decrease in productivity, a decrease in mechanical strength when the dip-molded article is formed, or a case where it becomes brittle.
- the polymerization terminator added when the polymerization is terminated is not particularly limited, and a commonly used one can be used. Specifically, phenothiazine, para-t-butylcatechol, hydroquinone, hydroquinone monomethyl ether, diethylhydroxylamine and the like can be used.
- the polymerization is started with the initial addition amount of the monomer being 10 to 50% by mass of the total amount, and the polymerization is performed until the monomer conversion rate is between 1 and 40%. It is preferable that the remaining monomer cooled to a temperature lower than the polymerization temperature is continuously added into the polymerization system from the point where the polymerization proceeds until the conversion to completion of polymerization is reached. Thereby, the heat removal in a polymerization system can be performed effectively and a polymerization reaction can be performed stably in a short time.
- an alkali metal salt of alkyldiphenyl ether disulfonic acid per 100 parts by mass of polychloroprene latex is added to the obtained polychloroprene latex, and the polychloroprene latex composition of this embodiment is added.
- the addition time of the alkali metal salt of alkyl diphenyl ether disulfonic acid is not particularly limited, and can be added at any time before emulsion polymerization, during emulsion polymerization or after completion of emulsion polymerization.
- the addition amount is preferably 0.1 to 0.4 times the addition amount of the alkali metal salt of rosin acid.
- chloroprene latex composition of the present embodiment may optionally contain an additive conventionally used in rubber latex processing.
- additives include other polymers, fillers, antioxidants, metal oxides, curing agents, surfactants, and plasticizers.
- the polychloroprene latex composition of the present embodiment uses rosin acid and alkyldiphenyl ether disulfonic acid, the adhesiveness of the polychloroprene latex composition is improved, and a mold for dip molding is used. It is possible to improve the releasability from. Moreover, since the polychloroprene latex composition of this embodiment is improving the crystal resistance of polychloroprene latex, the immersion molding excellent in the softness
- the polychloroprene latex composition of the present embodiment is suitable for immersion moldings such as gloves.
- the method for producing such a dip-molded body is not particularly limited, and a normal molding method can be applied. For example, after immersing / solidifying, leaching (removing water-soluble impurities), and drying. It is obtained by vulcanization.
- Example 1 ⁇ Polychloroprene latex> Using a reactor having an internal volume of 10 liters, water: 100 parts by mass, disproportionated sodium rosinate: 2.5 parts by mass, potassium hydroxide: 0.8 parts by mass, sodium naltarin sulfonate, Condensate of formaldehyde: 0.8 parts by mass and sodium sulfite: 0.3 parts by mass were added, and after dissolution, 100 parts by mass of chloroprene and 0.14 parts by mass of n-dodecyl mercaptan were added with stirring.
- polymerization was performed at 40 ° C. in a nitrogen atmosphere.
- an emulsion of phenothiazine was added to stop the polymerization, and sodium alkyldiphenyl ether disulfonate 0.5 parts by mass was added.
- unreacted monomers were removed under reduced pressure to obtain polychloroprene latex.
- the water was evaporated and concentrated under reduced pressure, and the solid content of the polychloroprene latex was adjusted to 60% by mass.
- the polychloroprene latex composition of Example 1 was prepared by adding the compounds shown in Table 1 below to the polychloroprene latex having a solid content of 60% by mass obtained by the method described above.
- Example 2 Except for changing the addition amount of the monomer to chloroprene monomer: 95 parts by mass and 2,3-dichloro-1,3-butadiene monomer: 5 parts by mass, the same as in Example 1 described above
- the polychloroprene latex composition of Example 2 was obtained by the method and conditions.
- Example 3 Except for changing the addition amount of the monomer to chloroprene monomer: 90 parts by mass and 2,3-dichloro-1,3-butadiene monomer: 10 parts by mass, the same as in Example 1 described above
- the polychloroprene latex composition of Example 3 was obtained by the method and conditions.
- Example 4 Except for changing the addition amount of the monomers to chloroprene monomer: 80 parts by mass and 2,3-dichloro-1,3-butadiene monomer: 20 parts by mass, the same as in Example 1 described above
- the polychloroprene latex composition of Example 4 was obtained by the method and conditions.
- Example 5 Polymerization was carried out with the initial charge amounts of monomers being 27 parts by mass of chloroprene monomer, 3 parts by mass of monomer of 2,3-dichloro-1,3-butadiene and 0.04 parts by mass of n-dodecyl mercaptan.
- Example 5 A polychloroprene latex composition of Example 5 was obtained in the same manner and under the same conditions as in Example 1 except that the addition of 0.1 part by mass was started.
- Example 6 Sodium alkyldiphenyl ether disulfonate: A polychloroprene latex composition of Example 6 was obtained in the same manner and under the same conditions as in Example 3 except that the addition of 0.5 part by mass was changed before the initiation of polymerization.
- Example 7 A polychloroprene latex composition of Example 7 was obtained in the same manner and under the same conditions as in Example 6 except that the addition amount of the condensate of sodium naltalin sulfonate and formaldehyde was changed to 0 parts by mass.
- Example 8 A polychloroprene latex composition of Example 8 was obtained in the same manner and under the same conditions as in Example 3 except that the amount of disproportionated sodium rosinate was changed to 1.5 parts by mass.
- Example 9 A polychloroprene latex composition of Example 9 was obtained in the same manner and under the same conditions as in Example 3 except that the amount of disproportionated sodium rosinate was changed to 3.0 parts by mass.
- Comparative Example 1 A polychloroprene latex composition of Comparative Example 1 was obtained in the same manner and under the same conditions as in Example 1 except that sodium alkyldiphenyl ether disulfonate was not used.
- Comparative Example 2 Example 1 described above, except that 0.5 parts by mass of a fatty acid (Vandes M-500-32 (disproportionated tall oil soap) manufactured by Harima Chemicals Co., Ltd.) was used instead of sodium alkyldiphenyl ether disulfonate.
- the polychloroprene latex composition of Comparative Example 2 was obtained in the same manner and under the same conditions.
- Comparative Example 3 Except for changing the addition amount of sodium of the formaldehyde naphthalenesulfonic acid condensate to 0 parts by mass and the addition amount of sodium alkyldiphenyl ether disulfonate to 1.2 parts by mass, the same method and conditions as in Example 6 described above, A polychloroprene latex composition of Comparative Example 3 was obtained.
- Comparative Example 4 A polychloroprene latex composition of Comparative Example 4 was obtained in the same manner and under the same conditions as in Example 3 except that the amount of disproportionated sodium rosinate was changed to 3.5 parts by mass.
- ⁇ Dry film hardness> The obtained polychloroprene latex was air-dried at room temperature, and then moisture was completely removed by vacuum drying to obtain a dry film.
- a plurality of the produced dry films were stacked and heated at 70 ° C. for 15 minutes to form a sheet having a thickness of 6 mm or more, and stored at room temperature for 1 week. This sheet was heated at 70 ° C. for 20 minutes, and after decrystallization, the hardness when stored at 0 ° C. for 150 hours was measured. At that time, the measurement of the dry film hardness was performed according to the type A durometer measurement method described in JIS K6253.
- ⁇ Film texture> The texture of the film was evaluated based on the amount of change in hardness when the dry film produced by the method described above was stored at 0 ° C. for 150 hours. The determination was ⁇ when the amount of change from the initial hardness was less than 50, ⁇ when it was 50 or more and less than 80, and ⁇ when it was less than 81.
- ⁇ Compounding stability> Each polychloroprene latex composition of Examples and Comparative Examples was filtered through an 80-mesh wire mesh to determine the amount of aggregates in the polychloroprene latex composition. And stability was evaluated in three steps according to the amount of aggregates. Specifically, the case where the amount of the aggregate was less than 0.02% by mass was evaluated as ⁇ , the case where the amount was 0.02% by mass or less and less than 0.5% by mass was evaluated as ⁇ , and the case where the aggregate amount was 0.5% by mass or more was determined as ⁇ .
- the primary flocculant used here improves the film formation of the immersion molding liquid, and the secondary flocculant promotes the solidification of the formed immersion molding liquid.
- the sample for evaluation was prepared by the following method.
- a test tube having an outer diameter of 40 mm and a length of 320 mm was immersed in a primary flocculant for 10 seconds to a depth of 150 mm with the mouth portion facing up.
- the polychloroprene latex composition was produced on the surface of the test tube.
- the obtained immersion film was leached (leached) with running water for 1 minute to remove water-soluble components.
- the immersion film from which this water-soluble component was removed was further immersed in a secondary flocculant for 1 minute, and then the surface secondary flocculant was removed with running water. Subsequently, it dried at 70 degreeC for 2 hours, and produced the unvulcanized film.
- This unvulcanized film is peeled off from the test tube, vulcanized at 141 ° C. for 60 minutes to obtain a vulcanized film, punched into a dumbbell shape No. 3 by the method described in JIS K6251, and manufactured by Ueshima Seisakusho. Using a tensile tester (Quick Reader mx), the modulus and the breaking strength at 300% elongation were measured.
- TERIC320 shown in Table 2 is a nonionic surfactant manufactured by HUNTSMAN.
- a glass plate having a width of 80 mm, a length of 150 mm, and a thickness of 4 mm was immersed in the primary flocculant for 10 seconds so as to have an immersion depth of 100 mm and air-dried for 3 minutes. Then, it was immersed in the polychloroprene latex composition for 4 minutes, and the immersion film was produced on the glass plate. The obtained immersion film was subjected to leaching (leaching) with running water for 1 minute to remove water-soluble components.
- the immersion film from which this water-soluble component was removed was further immersed in a secondary flocculant for 1 minute, and then the surface secondary flocculant was removed with running water. Subsequently, it dried at 70 degreeC for 2 hours, and produced the unvulcanized film on the glass plate. This film was vulcanized with a glass plate at 141 ° C. for 30 minutes to obtain a vulcanized film.
- the obtained vulcanized film was peeled 180 degrees from the glass plate using a Tensilon universal testing machine (TENSILON RTC-1225A) manufactured by ORIENTEC under a condition of 200 mm per minute according to JIS K-6854-2. The strength was measured. As a result, 180 degree peel strength was determined to be less than 0.02 N / mm, ⁇ , 0.02 N / mm to less than 0.05 N / mm, and 0.05 N / mm or more to be evaluated as x.
- TENSILON RTC-1225A Tensilon universal testing machine manufactured by ORIENTEC under a condition of 200 mm per minute according to JIS K-6854-2.
- the strength was measured.
- 180 degree peel strength was determined to be less than 0.02 N / mm, ⁇ , 0.02 N / mm to less than 0.05 N / mm, and 0.05 N / mm or more to be evaluated as x.
- ⁇ Vulcanized film adhesiveness> An evaluation sample (vulcanized film) was prepared using each of the polychloroprene latex compositions of Examples and Comparative Examples, and the primary flocculant B and secondary flocculant shown in Table 2 above. Specifically, this immersion molding liquid was subjected to immersion molding using a test tube under the same conditions as in the vulcanized film strength test, and an immersion film was produced on the surface of the test tube. Then, the obtained film was leached (leached) with running water for 1 minute to remove water-soluble components.
- the immersion film from which this water-soluble component was removed was further immersed in a secondary flocculant for 1 minute, and then the surface secondary flocculant was removed with running water. Subsequently, it dried at 70 degreeC for 2 hours, and produced the unvulcanized film.
- the unvulcanized film was peeled from the test tube and vulcanized at 141 ° C. for 30 minutes to produce a vulcanized film. Then, two vulcanized films obtained were thermocompression bonded at 70 ° C. to obtain evaluation samples.
- This sample for evaluation was subjected to a T-type peel test in accordance with JIS K-6854-3 under the condition of 200 mm per minute using a Tensilon universal testing machine (TENSILON RTC-1225A) manufactured by ORIENTEC Co., Ltd. Sex was evaluated in three stages. In the judgment, the case where the T-type peel strength was less than 0.02 N / mm was rated as ⁇ , the case where 0.02 N / mm or more and less than 0.05 N / mm was given, and the case where 0.05 N / mm or more was given as ⁇ .
- TENSILON RTC-1225A Tensilon universal testing machine
- the surfactant 1 shown in Tables 3 and 4 above is alkyl diphenyl ether disulfonic acid, and the surfactant 2 is a condensate of sodium naphthalene sulfonate and formaldehyde.
- the locations marked with * in the column of evaluation indicate that they were not worthy of evaluation because many aggregates were generated when the polychloroprene latex composition was blended.
- the locations marked with ** indicate that the film was not worthy of evaluation because a homogeneous film could not be obtained.
- the polychloroprene latex composition of Comparative Example 1 was agglomerated at the time of blending. Moreover, since the polychloroprene latex composition of Comparative Example 2 had a problem of fatty acid blooming on the film surface, the subsequent test was stopped. Furthermore, since the polychloroprene latex composition of Comparative Example 3 did not coagulate sufficiently and a homogeneous film could not be obtained, the subsequent test was stopped. Furthermore, the polychloroprene latex composition of Comparative Example 4 had a strong film adhesive strength and deteriorated peelability from the mold.
- the polychloroprene latex compositions of Examples 1 to 9 produced within the scope of the present invention exhibited excellent characteristics in all items. From this result, according to the present invention, it was confirmed that an immersion molded article having good mold releasability and excellent flexibility was obtained.
- the polychloroprene latex compositions of Examples 3, 5, 6 and 8 in which 2,3-dichloro-1,3-butadiene (DC) was copolymerized at 1 to 30% by mass of the whole monomer An immersion molded article with high film strength could be obtained.
- DC 2,3-dichloro-1,3-butadiene
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Abstract
Description
この組成物は、前記単量体100質量部中に2,3-ジクロロ-1,3-ブタジエンが1~30質量%含まれていてもよい。
また、本発明に係る他のポリクロロプレンラテックス組成物の製造方法は、単量体100質量部あたり3質量部以下のロジン酸のアルカリ金属塩を乳化剤として単量体を乳化重合した後、ポリクロロプレンラテックス:100質量部に対して、アルキルジフェニルエーテルジスルホン酸のアルカリ金属塩:0.01~1.0質量部を添加する。
これらの製造方法では、ロジン酸のアルカリ金属塩を乳化剤として単量体を乳化重合した後、アルキルジフェニルエーテルジスルホン酸のアルカリ金属塩を添加してもよい。
また、単量体の初期添加量を全単量体の10~50質量%として乳化重合を開始し、単量体の転化率が1~40%の間まで重合が進行した点から重合終了転化率に達するまでの間に、重合温度よりも低い温度に冷却した残りの単量体を重合系内へ連続的に添加して乳化重合することもできる。
ポリクロロプレンラテックスは、本実施形態のポリクロロプレンラテックス組成物の主成分である。しかしながら、単量体100質量部あたり3質量部を超えるロジン酸のアルカリ金属塩の存在下で乳化重合して得たポリクロロプレンラテックスを使用すると、得られる浸漬成形体(フィルム)同士が粘着しやすくなるため、使いにくくなる。よって、本実施形態の組成物では、単量体100質量部あたり3質量部以下のロジン酸のアルカリ金属塩の存在下で乳化重合して得たポリクロロプレンラテックスを使用する。
アルキルジフェニルエーテルジスルホン酸のアルカリ金属塩は、ポリクロロプレンラテックスの、乳化不良や凝集物の生成を低減し、均質な浸漬成形体を得るために添加されている。また、本実施形態の組成物においては、アルキルジフェニルエーテルジスルホン酸のアルカリ金属塩の含有量を、ポリクロロプレンラテックス100質量部あたり0.01~1.0質量部とする。
<ポリクロロプレンラテックス>
内容積10リットルの反応器を用いて、窒素気流下で水:100質量部、不均化ロジン酸ナトリウム:2.5質量部、水酸化カリウム:0.8質量部、ナルタリンスルホン酸ナトリウムとホルムアルデヒドの縮合物:0.8質量部、亜硫酸ナトリウム:0.3質量部を仕込み、溶解後、攪拌しながらクロロプレン100質量部とn-ドデシルメルカプタン0.14質量部を加えた。
前述した方法により得た固形分60質量%のポリクロロプレンラテックスに、下記表1示す化合物を添加して、実施例1のポリクロロプレンラテックス組成物を作製した。
単量体の添加量を、クロロプレン単量体:95質量部、2,3-ジクロロ-1,3-ブタジエンの単量体:5質量部に変更した以外は、前述した実施例1と同様の方法及び条件で、実施例2のポリクロロプレンラテックス組成物を得た。
単量体の添加量を、クロロプレン単量体:90質量部、2,3-ジクロロ-1,3-ブタジエンの単量体:10質量部に変更した以外は、前述した実施例1と同様の方法及び条件で、実施例3のポリクロロプレンラテックス組成物を得た。
単量体の添加量を、クロロプレン単量体:80質量部、2,3-ジクロロ-1,3-ブタジエンの単量体:20質量部に変更した以外は、前述した実施例1と同様の方法及び条件で、実施例4のポリクロロプレンラテックス組成物を得た。
単量体の初期仕込み量を、クロロプレン単量体:27質量部と2,3-ジクロロ-1,3-ブタジエンの単量体:3質量部及びn-ドデシルメルカプタン:0.04質量部として重合を開始し、重合率が10%になったところで、-10℃に冷却した残りのクロロプレン単量体:63質量部と2,3-ジクロロ-1,3-ブタジエンの単量体:7質量部及びn-ドデシルメルカプタン:0.1質量部の添加を開始することに変更した以外は、前述した実施例1と同様の方法及び条件で、実施例5のポリクロロプレンラテックス組成物を得た。
アルキルジフェニルエーテルジスルホン酸ナトリウム:0.5質量部の添加を重合開始前に変更したこと以外は、前述した実施例3と同様の方法及び条件で、実施例6のポリクロロプレンラテックス組成物を得た。
ナルタリンスルホン酸ナトリウムとホルムアルデヒドの縮合物の添加量を0質量部に変更したこと以外は、前述した実施例6と同様の方法及び条件で、実施例7のポリクロロプレンラテックス組成物を得た。
不均化ロジン酸ナトリウムの添加量を1.5質量部に変更したこと以外は、前述した実施例3と同様の方法及び条件で、実施例8のポリクロロプレンラテックス組成物を得た。
不均化ロジン酸ナトリウムの添加量を3.0質量部に変更したこと以外は、前述した実施例3と同様の方法及び条件で、実施例9のポリクロロプレンラテックス組成物を得た。
アルキルジフェニルエーテルジスルホン酸ナトリウムを使用しなかったこと以外は、前述した実施例1と同様の方法及び条件で、比較例1のポリクロロプレンラテックス組成物を得た。
アルキルジフェニルエーテルジスルホン酸ナトリウムの代わりに脂肪酸(ハリマ化成社製 バンデスM-500-32(不均化トール油石鹸))を0.5質量部添加することに変更したこと以外は、前述した実施例1と同様の方法及び条件で、比較例2のポリクロロプレンラテックス組成物を得た。
ホルムアルデヒドナフタレンスルホン酸縮合物のナトリウムの添加量を0質量部、アルキルジフェニルエーテルジスルホン酸ナトリウムの添加量を1.2質量部に変更したこと以外は、前述した実施例6と同様の方法及び条件で、比較例3のポリクロロプレンラテックス組成物を得た。
不均化ロジン酸ナトリウムの添加量を3.5質量部に変更したこと以外は、前述した実施例3と同様の方法及び条件で、比較例4のポリクロロプレンラテックス組成物を得た。
得られたポリクロロプレンラテックスを室温で風乾した後、真空乾燥により水分を完全に除去して乾燥フィルムを得た。作製した乾燥フィルムを複数枚重ねて70℃で15分間加熱して厚さ6mm以上のシート状にし、1週間室温で保管した。このシートを70℃で20分間加熱し、除晶後、0℃、150時間で保管した時の硬度を測定した。その際、乾燥フィルム硬度の測定は、JIS K6253に記載のタイプAデュロメータ測定方法に準じて行った。
前述した方法で作製した乾燥フィルムを、0℃、150時間で保管した時の硬度の変化量により、フィルムの風合いを評価した。判定は、初期硬度からの変化量が50未満であったものを◎、50以上80未満のものを○、81未満のものを×とした。
実施例及び比較例の各ポリクロロプレンラテックス組成物を、80メッシュの金網で濾過して、ポリクロロプレンラテックス組成物中の凝集物量を求めた。そして、凝集物量の多少により安定性を3段階で評価した。具体的には、凝集物量が0.02質量%未満のものを◎、0.02質量%以上0.5質量%未満のものを○、0.5質量%以上のものを×として判定した。
実施例及び比較例の各ポリクロロプレンラテックス組成物と、下記表2に示す一次凝集剤A及び二次凝集剤を用いて評価用試料(加硫フィルム)を作製した。なお、ここで使用する一次凝集剤は、浸漬成形液の成膜を向上させるものであり、二次凝集剤は、成膜した浸漬成形液の凝固を促進させるものである。
実施例及び比較例の各ポリクロロプレンラテックス組成物と、上記表2に示す一次凝集剤B及び二次凝集剤を用いて評価用試料(加硫フィルム)を作製した。なお、上記表2に示す「TERIC320」は、HUNTSMAN社のノニオン系界面活性剤である。
実施例及び比較例の各ポリクロロプレンラテックス組成物と、上記表2に示す一次凝集剤B及び二次凝集剤を用いて評価用試料(加硫フィルム)を作製した。具体的には、この浸漬成形液に、加硫フィルム強度試験と同一の条件で試験管を用いて浸漬成形して、試験管の表面に浸漬フィルムを作製した。そして、得られたフィルムを、流水で1分間リーチング(浸出)して水溶性成分を除去した。
Claims (7)
- 単量体100質量部あたり3質量部以下のロジン酸のアルカリ金属塩の存在下で乳化重合して得たポリクロロプレンラテックス:100質量部と、
アルキルジフェニルエーテルジスルホン酸のアルカリ金属塩:0.01~1.0質量部と、
を含有するポリクロロプレンラテックス組成物。 - 前記単量体100質量部中に2,3-ジクロロ-1,3-ブタジエンが1~30質量%含まれていることを特徴とする請求項1に記載のポリクロロプレンラテックス組成物。
- 単量体100質量部あたり3質量部以下のロジン酸のアルカリ金属塩及びアルキルジフェニルエーテルジスルホン酸のアルカリ金属塩の存在下で、単量体を乳化重合して、ポリクロロプレンラテックス100質量部に対して、アルキルジフェニルエーテルジスルホン酸のアルカリ金属塩を0.01~1.0質量部含有するポリクロロプレンラテックスを得るポリクロロプレンラテックス組成物の製造方法。
- 単量体100質量部あたり3質量部以下のロジン酸のアルカリ金属塩を乳化剤として単量体を乳化重合した後、ポリクロロプレンラテックス:100質量部に対して、アルキルジフェニルエーテルジスルホン酸のアルカリ金属塩:0.01~1.0質量部を添加するポリクロロプレンラテックス組成物の製造方法。
- 単量体の初期添加量を全単量体の10~50質量%として乳化重合を開始し、単量体の転化率が1~40%の間まで重合が進行した点から重合終了転化率に達するまでの間に、重合温度よりも低い温度に冷却した残りの単量体を重合系内へ連続的に添加して乳化重合することを特徴とする請求項3又は4に記載のポリクロロプレンラテックス組成物の製造方法。
- 請求項1又は2に記載のポリクロロプレンラテックス組成物を浸漬成形して得た浸漬成形体。
- 手袋であることを特徴とする請求項6に記載の浸漬成形体。
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