JP2018168343A - アクリルゴム、アクリルゴム組成物、ゴム架橋物、およびアクリルゴムの製造方法 - Google Patents
アクリルゴム、アクリルゴム組成物、ゴム架橋物、およびアクリルゴムの製造方法 Download PDFInfo
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- JP2018168343A JP2018168343A JP2017069244A JP2017069244A JP2018168343A JP 2018168343 A JP2018168343 A JP 2018168343A JP 2017069244 A JP2017069244 A JP 2017069244A JP 2017069244 A JP2017069244 A JP 2017069244A JP 2018168343 A JP2018168343 A JP 2018168343A
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- Prior art keywords
- acrylic rubber
- rubber
- acid
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- 239000005060 rubber Substances 0.000 title claims abstract description 36
- 239000000203 mixture Substances 0.000 title claims description 38
- 238000004519 manufacturing process Methods 0.000 title claims description 36
- -1 Acryl Chemical group 0.000 title abstract description 69
- 241001441571 Hiodontidae Species 0.000 claims abstract description 18
- 229920000800 acrylic rubber Polymers 0.000 claims description 113
- 229920000058 polyacrylate Polymers 0.000 claims description 113
- 239000000178 monomer Substances 0.000 claims description 95
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims description 24
- 238000004132 cross linking Methods 0.000 claims description 22
- 239000012875 nonionic emulsifier Substances 0.000 claims description 14
- 239000012874 anionic emulsifier Substances 0.000 claims description 13
- 239000003431 cross linking reagent Substances 0.000 claims description 13
- 238000007720 emulsion polymerization reaction Methods 0.000 claims description 10
- 239000003607 modifier Substances 0.000 claims description 9
- WNAHIZMDSQCWRP-UHFFFAOYSA-N dodecane-1-thiol Chemical group CCCCCCCCCCCCS WNAHIZMDSQCWRP-UHFFFAOYSA-N 0.000 claims description 8
- 238000001125 extrusion Methods 0.000 abstract description 7
- 238000006116 polymerization reaction Methods 0.000 description 45
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 23
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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 9
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- JIGUQPWFLRLWPJ-UHFFFAOYSA-N Ethyl acrylate Chemical compound CCOC(=O)C=C JIGUQPWFLRLWPJ-UHFFFAOYSA-N 0.000 description 8
- 125000004432 carbon atom Chemical group C* 0.000 description 8
- 239000003995 emulsifying agent Substances 0.000 description 8
- 150000002148 esters Chemical class 0.000 description 8
- 229910052736 halogen Inorganic materials 0.000 description 8
- 150000002367 halogens Chemical class 0.000 description 8
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 7
- CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical compound CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 description 7
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
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- 125000005907 alkyl ester group Chemical group 0.000 description 6
- 230000003712 anti-aging effect Effects 0.000 description 6
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- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 5
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- 239000000243 solution Substances 0.000 description 5
- JAHNSTQSQJOJLO-UHFFFAOYSA-N 2-(3-fluorophenyl)-1h-imidazole Chemical compound FC1=CC=CC(C=2NC=CN=2)=C1 JAHNSTQSQJOJLO-UHFFFAOYSA-N 0.000 description 4
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- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 4
- 150000001990 dicarboxylic acid derivatives Chemical class 0.000 description 4
- 125000003700 epoxy group Chemical group 0.000 description 4
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 4
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 3
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 3
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 3
- 239000005977 Ethylene Substances 0.000 description 3
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 3
- GYCMBHHDWRMZGG-UHFFFAOYSA-N Methylacrylonitrile Chemical compound CC(=C)C#N GYCMBHHDWRMZGG-UHFFFAOYSA-N 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 125000000129 anionic group Chemical group 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 3
- 239000000945 filler Substances 0.000 description 3
- 150000002357 guanidines Chemical class 0.000 description 3
- 238000004898 kneading Methods 0.000 description 3
- 150000002825 nitriles Chemical class 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 235000019198 oils Nutrition 0.000 description 3
- 150000001451 organic peroxides Chemical class 0.000 description 3
- PNJWIWWMYCMZRO-UHFFFAOYSA-N pent‐4‐en‐2‐one Natural products CC(=O)CC=C PNJWIWWMYCMZRO-UHFFFAOYSA-N 0.000 description 3
- 230000000704 physical effect Effects 0.000 description 3
- 229920000728 polyester Polymers 0.000 description 3
- 239000011593 sulfur Substances 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- 229920002554 vinyl polymer Polymers 0.000 description 3
- ZMQWRASVUXJXGM-VOTSOKGWSA-N (e)-4-cyclohexyloxy-4-oxobut-2-enoic acid Chemical compound OC(=O)\C=C\C(=O)OC1CCCCC1 ZMQWRASVUXJXGM-VOTSOKGWSA-N 0.000 description 2
- MYRTYDVEIRVNKP-UHFFFAOYSA-N 1,2-Divinylbenzene Chemical compound C=CC1=CC=CC=C1C=C MYRTYDVEIRVNKP-UHFFFAOYSA-N 0.000 description 2
- UZKWTJUDCOPSNM-UHFFFAOYSA-N 1-ethenoxybutane Chemical compound CCCCOC=C UZKWTJUDCOPSNM-UHFFFAOYSA-N 0.000 description 2
- XSQHUYDRSDBCHN-UHFFFAOYSA-N 2,3-dimethyl-2-propan-2-ylbutanenitrile Chemical compound CC(C)C(C)(C#N)C(C)C XSQHUYDRSDBCHN-UHFFFAOYSA-N 0.000 description 2
- 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
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 2
- 125000004200 2-methoxyethyl group Chemical group [H]C([H])([H])OC([H])([H])C([H])([H])* 0.000 description 2
- UJAWGGOCYUPCPS-UHFFFAOYSA-N 4-(2-phenylpropan-2-yl)-n-[4-(2-phenylpropan-2-yl)phenyl]aniline Chemical compound C=1C=C(NC=2C=CC(=CC=2)C(C)(C)C=2C=CC=CC=2)C=CC=1C(C)(C)C1=CC=CC=C1 UJAWGGOCYUPCPS-UHFFFAOYSA-N 0.000 description 2
- KHYXYOGWAIYVBD-UHFFFAOYSA-N 4-(4-propylphenoxy)aniline Chemical compound C1=CC(CCC)=CC=C1OC1=CC=C(N)C=C1 KHYXYOGWAIYVBD-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- CIWBSHSKHKDKBQ-DUZGATOHSA-N D-araboascorbic acid Natural products OC[C@@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-DUZGATOHSA-N 0.000 description 2
- VZCYOOQTPOCHFL-OWOJBTEDSA-N Fumaric acid Chemical compound OC(=O)\C=C\C(O)=O VZCYOOQTPOCHFL-OWOJBTEDSA-N 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- RRHGJUQNOFWUDK-UHFFFAOYSA-N Isoprene Chemical compound CC(=C)C=C RRHGJUQNOFWUDK-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 description 2
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 2
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 2
- 229940114077 acrylic acid Drugs 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 125000002723 alicyclic group Chemical group 0.000 description 2
- 150000005215 alkyl ethers Chemical class 0.000 description 2
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 2
- 150000001408 amides Chemical class 0.000 description 2
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- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 description 2
- 125000003118 aryl group Chemical group 0.000 description 2
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- 239000006232 furnace black Substances 0.000 description 2
- 125000005179 haloacetyl group Chemical group 0.000 description 2
- 125000005843 halogen group Chemical group 0.000 description 2
- 125000004970 halomethyl group Chemical group 0.000 description 2
- IPCSVZSSVZVIGE-UHFFFAOYSA-N hexadecanoic acid Chemical compound CCCCCCCCCCCCCCCC(O)=O IPCSVZSSVZVIGE-UHFFFAOYSA-N 0.000 description 2
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- 150000002460 imidazoles Chemical class 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 2
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 2
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- 150000002576 ketones Chemical class 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 2
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 2
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- CYIDZMCFTVVTJO-UHFFFAOYSA-N pyromellitic acid Chemical compound OC(=O)C1=CC(C(O)=O)=C(C(O)=O)C=C1C(O)=O CYIDZMCFTVVTJO-UHFFFAOYSA-N 0.000 description 2
- 239000012763 reinforcing filler Substances 0.000 description 2
- XWGJFPHUCFXLBL-UHFFFAOYSA-M rongalite Chemical compound [Na+].OCS([O-])=O XWGJFPHUCFXLBL-UHFFFAOYSA-M 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
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- PPASLZSBLFJQEF-RKJRWTFHSA-M sodium ascorbate Substances [Na+].OC[C@@H](O)[C@H]1OC(=O)C(O)=C1[O-] PPASLZSBLFJQEF-RKJRWTFHSA-M 0.000 description 2
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- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 description 1
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- QCAHYQPONLPBNQ-AATRIKPKSA-N (e)-4-cyclopentyloxy-4-oxobut-2-enoic acid Chemical compound OC(=O)\C=C\C(=O)OC1CCCC1 QCAHYQPONLPBNQ-AATRIKPKSA-N 0.000 description 1
- XLYMOEINVGRTEX-ONEGZZNKSA-N (e)-4-ethoxy-4-oxobut-2-enoic acid Chemical compound CCOC(=O)\C=C\C(O)=O XLYMOEINVGRTEX-ONEGZZNKSA-N 0.000 description 1
- ZMQWRASVUXJXGM-SREVYHEPSA-N (z)-4-cyclohexyloxy-4-oxobut-2-enoic acid Chemical compound OC(=O)\C=C/C(=O)OC1CCCCC1 ZMQWRASVUXJXGM-SREVYHEPSA-N 0.000 description 1
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- WBYWAXJHAXSJNI-VOTSOKGWSA-M .beta-Phenylacrylic acid Natural products [O-]C(=O)\C=C\C1=CC=CC=C1 WBYWAXJHAXSJNI-VOTSOKGWSA-M 0.000 description 1
- WZCQRUWWHSTZEM-UHFFFAOYSA-N 1,3-phenylenediamine Chemical compound NC1=CC=CC(N)=C1 WZCQRUWWHSTZEM-UHFFFAOYSA-N 0.000 description 1
- CBCKQZAAMUWICA-UHFFFAOYSA-N 1,4-phenylenediamine Chemical compound NC1=CC=C(N)C=C1 CBCKQZAAMUWICA-UHFFFAOYSA-N 0.000 description 1
- PGRNEGLBSNLPNP-UHFFFAOYSA-N 1,6-dichloro-3-methylhex-1-ene Chemical compound ClC=CC(C)CCCCl PGRNEGLBSNLPNP-UHFFFAOYSA-N 0.000 description 1
- KKLSEIIDJBCSRK-UHFFFAOYSA-N 1-(chloromethyl)-2-ethenylbenzene Chemical compound ClCC1=CC=CC=C1C=C KKLSEIIDJBCSRK-UHFFFAOYSA-N 0.000 description 1
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Landscapes
- Polymerisation Methods In General (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Abstract
Description
本発明のアクリルゴムは、ムーニー粘度が30〜50であり、かつ、ムーニー応力緩和が0.21以上である、アクリルゴムである。
て、(メタ)アクリル酸アルキルエステル単量体単位30〜100重量%、および(メタ)アクリル酸アルコキシアルキルエステル単量体単位70〜0重量%からなるものを用いることが好ましい。
ペンチル、マレイン酸モノシクロヘキシル、マレイン酸モノシクロヘキセニルなどの脂環構造を有するブテンジオン酸モノ環状アルキルエステル;イタコン酸モノメチル、イタコン酸モノエチル、イタコン酸モノn−ブチル、イタコン酸モノシクロヘキシルなどのイタコン酸モノエステル;などが挙げられる。
本発明のアクリルゴムの製造方法は、ノニオン系乳化剤、アニオン系乳化剤、及び分子量調整剤の存在下で、(メタ)アクリル酸エステル単量体と架橋性単量体とを共重合(乳化重合)するアクリルゴムの製造方法であり、分子量調整剤は、n−ドデシルメルカプタンであり、アニオン系乳化剤に対するノニオン系乳化剤の使用比率が0.3以上である。
(塩);糖類;ヒドロキシメタンスルフィン酸ナトリウムなどのスルフィン酸塩;亜硫酸ナトリウム、亜硫酸カリウム、亜硫酸水素ナトリウム、アルデヒド亜硫酸水素ナトリウム、亜硫酸水素カリウムの亜硫酸塩;ピロ亜硫酸ナトリウム、ピロ亜硫酸カリウム、ピロ亜硫酸水素ナトリウム、ピロ亜硫酸水素カリウムなどのピロ亜硫酸塩;チオ硫酸ナトリウム、チオ硫酸カリウムなどのチオ硫酸塩;亜燐酸、亜燐酸ナトリウム、亜燐酸カリウム、亜燐酸水素ナトリウム、亜燐酸水素カリウムの亜燐酸(塩);ピロ亜燐酸、ピロ亜燐酸ナトリウム、ピロ亜燐酸カリウム、ピロ亜燐酸水素ナトリウム、ピロ亜燐酸水素カリウムなどのピロ亜燐酸(塩);ナトリウムホルムアルデヒドスルホキシレートなどが挙げられる。これらの還元剤は単独でまたは2種以上を組合せて用いることができる。還元剤の使用量は、重合開始剤100重量部に対して、好ましくは0.003〜2.0重量部である。
本発明のアクリルゴム組成物は、上記した本発明のアクリルゴムに架橋剤を配合してなるものである。
本発明のゴム架橋物は、上述した本発明のアクリルゴム組成物を架橋してなるものである。
また、ゴム架橋物の形状、大きさなどによっては、本発明のゴム架橋物は、さらに加熱して二次架橋を行ってもよい。二次架橋は、加熱方法、架橋温度、形状などにより異なるが、好ましくは1〜48時間行う。加熱方法、加熱温度は適宜選択すればよい。
アクリルゴムのムーニー粘度(ポリマームーニー粘度)(ML1+4、100℃)をJIS K6300に従って測定した。
アクリルゴムの応力緩和性をASTM D1646−7に準じたムーニー応力緩和測定により確認した。具体的には、ポリマームーニー粘度の測定条件下で、測定4分後にローターが停止した時(0秒)のトルクを100%とし、その値が80%緩和するまでのムーニー粘度の減衰量を、同様に80%緩和するまでの時間で割ることにより、ムーニー応力緩和(単位時間当たりのムーニー粘度の減衰量)を測定した。
アクリルゴム組成物を、縦15cm、横15cm、深さ0.2cmの金型に入れ、プレス圧10MPaで加圧しながら170℃で20分間プレスすることにより一次架橋し、次いで、得られた一次架橋物を、ギヤー式オーブンにて、さらに170℃、4時間の条件で加熱して二次架橋させることにより、シート状のゴム架橋物を得た。得られたゴム架橋物を3号形ダンベルで打ち抜いて試験片を作製した。次にこの試験片を用いて、JIS K6251に従い、常態物性(機械的強度)として引張強度(MPa)を測定した。なお、引張強度の評価は、引張強度が9.0MPa以上の場合は機械的強度に優れるものとし、引張強度が9.0MPa未満の場合は機械的強度が劣るものとした。
未加硫のアクリルゴム組成物の押出加工性を、ASTM D2230 A法に準じたガーベダイ押出試験により確認した。具体的には、先端にガーベダイを付けた押出機(単軸バレル径20mm、回転数30rpm、バレル温度60℃、ヘッド温度80℃)を用いて、未加硫のアクリルゴム組成物を押出成形した。押出成形されたアクリルゴム組成物について、表面肌(押出肌)の平滑性を1〜4の4段階で評価した。評価基準は、4を良好とし、3以下は不良と評価した。
ホモミキサーを備えた混合容器に、純水46.294部、アクリル酸エチル49.3部、アクリル酸n−ブチル49.3部、フマル酸モノn−ブチル1.4部、アニオン系乳化剤としてラウリル硫酸ナトリウム(商品名「エマール 2FG」、花王社製)1.4部、ノニオン系乳化剤としてモノステアリン酸ポリエチレングリコール(商品名「ノニオン S−40」、日油社製)0.57部、及び分子量調整剤としてn−ドデシルメルカプタン(商品名「チオカルコール20」、花王社製)0.025部を仕込み、攪拌することで、単量体乳化液を得た。なお、アニオン系乳化剤に対するノニオン系乳化剤の使用比率は、0.41である。
分子量調整剤としてのn−ドデシルメルカプタンの使用量を0.025部から0.04部に、重合温度を23℃から13℃に変更した以外は、製造例1同様にして、固形状のアクリルゴム(A2)を得た。
分子量調整剤としてのn−ドデシルメルカプタンをt−ドデシルメルカプタン(商品名「TDM」三新化学工業社製)に変更した以外は、製造例1と同様にして、単量体乳化液を得た。そして、得られた単量体乳化液を使用した以外は、製造例1同様にして、固形状のアクリルゴム(A3)を得た。
ノニオン系乳化剤としてのモノステアリン酸ポリエチレングリコールの使用量を0.57部から0.4部に変更し、分子量調整剤としてのn−ドデシルメルカプタンの使用量を0.04部から0.01部に変更した以外は製造例2と同様にして、単量体乳化液を得た。なお、アニオン系乳化剤に対するノニオン系乳化剤の使用比率は、0.29である。そして、得られた単量体乳化液を使用した以外は、製造例1同様にして、固形状のアクリルゴム(A4)を得た。
分子量調整剤としてn−ドデシルメルカプタンの使用量を0.04部から0部に変更した以外は製造例2と同様にして、単量体乳化液を得た。そして、得られた単量体乳化液を使用した以外は、製造例1同様にして、固形状のアクリルゴム(A5)を得た。
バンバリーミキサーを用いて、製造例1で得られたアクリルゴム(A1)100部に、FEFカーボンブラック(商品名「シーストSO」、東海カーボン社製、充填剤、「シースト」は登録商標)55部、可塑剤(商品名「アデカサイザーRS735」、アデカ社製、「アデカサイザー」は登録商標)1.5部、ステアリン酸2部、エステル系ワックス(商品名「グレックG−8205」、大日本インキ化学社製)1部、老化防止剤として4, 4'−ビス(α,α-ジメチルベンジル)ジフェニルアミン(商品名「ノクラックCD」、大内新興化学工業社製)2部を添加して、50℃で5分間混合した。次いで、得られた混合物を50℃のロールに移した。これに、架橋剤として2,2−ビス〔4−(4−アミノフェノキシ)フェニル〕プロパン(商品名「BAPP」、和歌山精化工業社製、架橋剤)1部、架橋促進剤として1,8−ジアザビシクロ[5,4,0]ウンデカ−7−エン(DBU)(商品名「RHENOGRAN XLA−60」、RheinChemie社製、「RHENOGRAN」は登録商標、DBU60%(ジンクジアルキルジフォスフェイト塩になっている部分を含む)2部を配合し、混練することにより、アクリルゴム組成物を得た。
製造例1で得られたアクリルゴム(A1)に代えて、製造例2で得られたアクリルゴム(A2)をそれぞれ使用した以外は、実施例1と同様にして、アクリルゴム組成物を得て、同様に測定・評価を行った結果を表1に示す。
製造例1で得られたアクリルゴム(A1)に代えて、製造例3〜5で得られたアクリルゴム(A3)〜(A5)をそれぞれ使用した以外は、実施例1と同様にして、アクリルゴム組成物を得て、同様に測定・評価を行った結果を表1に示す。
以上、本発明の実施形態について実施例を挙げて説明したが、本発明は特定の実施形態、実施例に限定されるものではなく、特許請求の範囲に記載された発明の範囲内において、種々の変形、変更が可能である。
Claims (4)
- ムーニー粘度が30〜50であり、かつ、ムーニー応力緩和が0.21以上である、アクリルゴム。
- 請求項1に記載のアクリルゴムと、架橋剤とを含有するアクリルゴム組成物。
- 請求項2に記載のアクリルゴム組成物を架橋してなるゴム架橋物。
- ノニオン系乳化剤、アニオン系乳化剤、及び分子量調整剤の存在下で、(メタ)アクリル酸エステル単量体を乳化重合するアクリルゴムの製造方法であって、
前記分子量調整剤は、n−ドデシルメルカプタンであり、
前記アニオン系乳化剤に対する前記ノニオン系乳化剤の使用比率が0.3以上である、アクリルゴムの製造方法。
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