JPH04154801A - Agent for preventing deposition of scale in production of vinyl chloride polymer and prevention process - Google Patents
Agent for preventing deposition of scale in production of vinyl chloride polymer and prevention processInfo
- Publication number
- JPH04154801A JPH04154801A JP28126490A JP28126490A JPH04154801A JP H04154801 A JPH04154801 A JP H04154801A JP 28126490 A JP28126490 A JP 28126490A JP 28126490 A JP28126490 A JP 28126490A JP H04154801 A JPH04154801 A JP H04154801A
- Authority
- JP
- Japan
- Prior art keywords
- vinyl chloride
- scale
- polymerization
- polymer
- monomers
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229920000642 polymer Polymers 0.000 title claims abstract description 34
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims description 19
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 230000008021 deposition Effects 0.000 title abstract 3
- 230000002265 prevention Effects 0.000 title description 11
- 238000006116 polymerization reaction Methods 0.000 claims abstract description 51
- 239000000178 monomer Substances 0.000 claims abstract description 34
- 238000000576 coating method Methods 0.000 claims abstract description 26
- 239000011248 coating agent Substances 0.000 claims abstract description 25
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 15
- 238000007127 saponification reaction Methods 0.000 claims abstract description 10
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 13
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 11
- PYKYMHQGRFAEBM-UHFFFAOYSA-N anthraquinone Natural products CCC(=O)c1c(O)c2C(=O)C3C(C=CC=C3O)C(=O)c2cc1CC(=O)OC PYKYMHQGRFAEBM-UHFFFAOYSA-N 0.000 claims description 9
- 150000004056 anthraquinones Chemical class 0.000 claims description 9
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims description 7
- 229920002554 vinyl polymer Polymers 0.000 claims description 7
- 230000003449 preventive effect Effects 0.000 claims description 5
- 230000000379 polymerizing effect Effects 0.000 claims description 4
- 229930182559 Natural dye Natural products 0.000 claims description 3
- 239000000978 natural dye Substances 0.000 claims description 3
- 239000000049 pigment Substances 0.000 abstract description 9
- GCDBEYOJCZLKMC-UHFFFAOYSA-N 2-hydroxyanthraquinone Chemical compound C1=CC=C2C(=O)C3=CC(O)=CC=C3C(=O)C2=C1 GCDBEYOJCZLKMC-UHFFFAOYSA-N 0.000 abstract description 4
- RNJHIYAJJKOFIO-UHFFFAOYSA-N 3-Oxy-2-methyl-anthrachinon Natural products O=C1C2=CC=CC=C2C(=O)C2=C1C=C(C)C(O)=C2 RNJHIYAJJKOFIO-UHFFFAOYSA-N 0.000 abstract description 4
- NJWGQARXZDRHCD-UHFFFAOYSA-N 2-methylanthraquinone Chemical compound C1=CC=C2C(=O)C3=CC(C)=CC=C3C(=O)C2=C1 NJWGQARXZDRHCD-UHFFFAOYSA-N 0.000 abstract 2
- 235000019422 polyvinyl alcohol Nutrition 0.000 description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 241000251468 Actinopterygii Species 0.000 description 8
- 239000003112 inhibitor Substances 0.000 description 8
- 239000007788 liquid Substances 0.000 description 8
- 239000003505 polymerization initiator Substances 0.000 description 8
- 238000005259 measurement Methods 0.000 description 7
- 239000006185 dispersion Substances 0.000 description 6
- 239000002270 dispersing agent Substances 0.000 description 5
- 230000005484 gravity Effects 0.000 description 5
- 239000002904 solvent Substances 0.000 description 5
- 238000003756 stirring Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- BXWNKGSJHAJOGX-UHFFFAOYSA-N hexadecan-1-ol Chemical compound CCCCCCCCCCCCCCCCO BXWNKGSJHAJOGX-UHFFFAOYSA-N 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- -1 propatool Chemical compound 0.000 description 4
- 239000002455 scale inhibitor Substances 0.000 description 4
- 239000003381 stabilizer Substances 0.000 description 4
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 3
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 3
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 description 3
- MQIUGAXCHLFZKX-UHFFFAOYSA-N Di-n-octyl phthalate Natural products CCCCCCCCOC(=O)C1=CC=CC=C1C(=O)OCCCCCCCC MQIUGAXCHLFZKX-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 3
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 3
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- BJQHLKABXJIVAM-UHFFFAOYSA-N bis(2-ethylhexyl) phthalate Chemical compound CCCCC(CC)COC(=O)C1=CC=CC=C1C(=O)OCC(CC)CCCC BJQHLKABXJIVAM-UHFFFAOYSA-N 0.000 description 3
- BTANRVKWQNVYAZ-UHFFFAOYSA-N butan-2-ol Chemical compound CCC(C)O BTANRVKWQNVYAZ-UHFFFAOYSA-N 0.000 description 3
- 239000012159 carrier gas Substances 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000003995 emulsifying agent Substances 0.000 description 3
- 238000010557 suspension polymerization reaction Methods 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-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
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 125000000129 anionic group Chemical group 0.000 description 2
- 229960000541 cetyl alcohol Drugs 0.000 description 2
- 238000004040 coloring Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- DOIRQSBPFJWKBE-UHFFFAOYSA-N dibutyl phthalate Chemical compound CCCCOC(=O)C1=CC=CC=C1C(=O)OCCCC DOIRQSBPFJWKBE-UHFFFAOYSA-N 0.000 description 2
- 238000002845 discoloration Methods 0.000 description 2
- 150000002148 esters Chemical class 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- PHTQWCKDNZKARW-UHFFFAOYSA-N isoamylol Chemical compound CC(C)CCO PHTQWCKDNZKARW-UHFFFAOYSA-N 0.000 description 2
- 238000004898 kneading Methods 0.000 description 2
- IHLWXZNPOVMUFQ-UHFFFAOYSA-N laccaic acid A Chemical compound CC(=O)NCCC1=CC=C(O)C(C=2C(=C3C(=O)C4=C(C(O)=O)C(C(O)=O)=C(O)C=C4C(=O)C3=C(O)C=2O)O)=C1 IHLWXZNPOVMUFQ-UHFFFAOYSA-N 0.000 description 2
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- TZIHFWKZFHZASV-UHFFFAOYSA-N methyl formate Chemical compound COC=O TZIHFWKZFHZASV-UHFFFAOYSA-N 0.000 description 2
- JYVLIDXNZAXMDK-UHFFFAOYSA-N pentan-2-ol Chemical compound CCCC(C)O JYVLIDXNZAXMDK-UHFFFAOYSA-N 0.000 description 2
- 239000004014 plasticizer Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 2
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- WRXCBRHBHGNNQA-UHFFFAOYSA-N (2,4-dichlorobenzoyl) 2,4-dichlorobenzenecarboperoxoate Chemical compound ClC1=CC(Cl)=CC=C1C(=O)OOC(=O)C1=CC=C(Cl)C=C1Cl WRXCBRHBHGNNQA-UHFFFAOYSA-N 0.000 description 1
- JNYAEWCLZODPBN-JGWLITMVSA-N (2r,3r,4s)-2-[(1r)-1,2-dihydroxyethyl]oxolane-3,4-diol Chemical compound OC[C@@H](O)[C@H]1OC[C@H](O)[C@H]1O JNYAEWCLZODPBN-JGWLITMVSA-N 0.000 description 1
- LZDKZFUFMNSQCJ-UHFFFAOYSA-N 1,2-diethoxyethane Chemical compound CCOCCOCC LZDKZFUFMNSQCJ-UHFFFAOYSA-N 0.000 description 1
- XSZYESUNPWGWFQ-UHFFFAOYSA-N 1-(2-hydroperoxypropan-2-yl)-4-methylcyclohexane Chemical compound CC1CCC(C(C)(C)OO)CC1 XSZYESUNPWGWFQ-UHFFFAOYSA-N 0.000 description 1
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2,2'-azo-bis-isobutyronitrile Substances N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 description 1
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical class COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- VGZZAZYCLRYTNQ-UHFFFAOYSA-N 2-ethoxyethoxycarbonyloxy 2-ethoxyethyl carbonate Chemical compound CCOCCOC(=O)OOC(=O)OCCOCC VGZZAZYCLRYTNQ-UHFFFAOYSA-N 0.000 description 1
- ZACVGCNKGYYQHA-UHFFFAOYSA-N 2-ethylhexoxycarbonyloxy 2-ethylhexyl carbonate Chemical compound CCCCC(CC)COC(=O)OOC(=O)OCC(CC)CCCC ZACVGCNKGYYQHA-UHFFFAOYSA-N 0.000 description 1
- NXVGUNGPINUNQN-UHFFFAOYSA-N 2-phenylpropan-2-yl 7,7-dimethyloctaneperoxoate Chemical compound CC(C)(C)CCCCCC(=O)OOC(C)(C)C1=CC=CC=C1 NXVGUNGPINUNQN-UHFFFAOYSA-N 0.000 description 1
- KFGFVPMRLOQXNB-UHFFFAOYSA-N 3,5,5-trimethylhexanoyl 3,5,5-trimethylhexaneperoxoate Chemical compound CC(C)(C)CC(C)CC(=O)OOC(=O)CC(C)CC(C)(C)C KFGFVPMRLOQXNB-UHFFFAOYSA-N 0.000 description 1
- FRIBMENBGGCKPD-UHFFFAOYSA-N 3-(2,3-dimethoxyphenyl)prop-2-enal Chemical compound COC1=CC=CC(C=CC=O)=C1OC FRIBMENBGGCKPD-UHFFFAOYSA-N 0.000 description 1
- LBKMJZAKWQTTHC-UHFFFAOYSA-N 4-methyldioxolane Chemical compound CC1COOC1 LBKMJZAKWQTTHC-UHFFFAOYSA-N 0.000 description 1
- XZIIFPSPUDAGJM-UHFFFAOYSA-N 6-chloro-2-n,2-n-diethylpyrimidine-2,4-diamine Chemical compound CCN(CC)C1=NC(N)=CC(Cl)=N1 XZIIFPSPUDAGJM-UHFFFAOYSA-N 0.000 description 1
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 1
- RGCKGOZRHPZPFP-UHFFFAOYSA-N Alizarin Natural products C1=CC=C2C(=O)C3=C(O)C(O)=CC=C3C(=O)C2=C1 RGCKGOZRHPZPFP-UHFFFAOYSA-N 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- 239000004342 Benzoyl peroxide Substances 0.000 description 1
- OMPJBNCRMGITSC-UHFFFAOYSA-N Benzoylperoxide Chemical compound C=1C=CC=CC=1C(=O)OOC(=O)C1=CC=CC=C1 OMPJBNCRMGITSC-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical class S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- IMROMDMJAWUWLK-UHFFFAOYSA-N Ethenol Chemical compound OC=C IMROMDMJAWUWLK-UHFFFAOYSA-N 0.000 description 1
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 description 1
- 108010010803 Gelatin Proteins 0.000 description 1
- 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 1
- IMQLKJBTEOYOSI-GPIVLXJGSA-N Inositol-hexakisphosphate Chemical compound OP(O)(=O)O[C@H]1[C@H](OP(O)(O)=O)[C@@H](OP(O)(O)=O)[C@H](OP(O)(O)=O)[C@H](OP(O)(O)=O)[C@@H]1OP(O)(O)=O IMQLKJBTEOYOSI-GPIVLXJGSA-N 0.000 description 1
- DJSGRCAKYFXCDH-UHFFFAOYSA-N Laccaic acid A Natural products CC(=O)NCCc1ccc(C)c(c1)c2c(O)c(O)c3C(=O)c4cc(O)c(C(=O)O)c(C(=O)O)c4C(=O)c3c2O DJSGRCAKYFXCDH-UHFFFAOYSA-N 0.000 description 1
- YIVJZNGAASQVEM-UHFFFAOYSA-N Lauroyl peroxide Chemical compound CCCCCCCCCCCC(=O)OOC(=O)CCCCCCCCCCC YIVJZNGAASQVEM-UHFFFAOYSA-N 0.000 description 1
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical class CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 1
- NTIZESTWPVYFNL-UHFFFAOYSA-N Methyl isobutyl ketone Chemical compound CC(C)CC(C)=O NTIZESTWPVYFNL-UHFFFAOYSA-N 0.000 description 1
- UIHCLUNTQKBZGK-UHFFFAOYSA-N Methyl isobutyl ketone Natural products CCC(C)C(C)=O UIHCLUNTQKBZGK-UHFFFAOYSA-N 0.000 description 1
- WRQNANDWMGAFTP-UHFFFAOYSA-N Methylacetoacetic acid Chemical compound COC(=O)CC(C)=O WRQNANDWMGAFTP-UHFFFAOYSA-N 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- IMQLKJBTEOYOSI-UHFFFAOYSA-N Phytic acid Natural products OP(O)(=O)OC1C(OP(O)(O)=O)C(OP(O)(O)=O)C(OP(O)(O)=O)C(OP(O)(O)=O)C1OP(O)(O)=O IMQLKJBTEOYOSI-UHFFFAOYSA-N 0.000 description 1
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 1
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 1
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 description 1
- 229920002125 Sokalan® Polymers 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- XSTXAVWGXDQKEL-UHFFFAOYSA-N Trichloroethylene Chemical group ClC=C(Cl)Cl XSTXAVWGXDQKEL-UHFFFAOYSA-N 0.000 description 1
- QYKIQEUNHZKYBP-UHFFFAOYSA-N Vinyl ether Chemical compound C=COC=C QYKIQEUNHZKYBP-UHFFFAOYSA-N 0.000 description 1
- 235000011054 acetic acid Nutrition 0.000 description 1
- KXKVLQRXCPHEJC-UHFFFAOYSA-N acetic acid trimethyl ester Natural products COC(C)=O KXKVLQRXCPHEJC-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000005456 alcohol based solvent Substances 0.000 description 1
- HFVAFDPGUJEFBQ-UHFFFAOYSA-M alizarin red S Chemical compound [Na+].O=C1C2=CC=CC=C2C(=O)C2=C1C=C(S([O-])(=O)=O)C(O)=C2O HFVAFDPGUJEFBQ-UHFFFAOYSA-M 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N ammonia Natural products N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- 150000008064 anhydrides Chemical class 0.000 description 1
- 239000000010 aprotic solvent Substances 0.000 description 1
- 239000012736 aqueous medium Substances 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 235000019400 benzoyl peroxide Nutrition 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000001506 calcium phosphate Substances 0.000 description 1
- 229910000389 calcium phosphate Inorganic materials 0.000 description 1
- 235000011010 calcium phosphates Nutrition 0.000 description 1
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 description 1
- 239000008116 calcium stearate Substances 0.000 description 1
- 235000013539 calcium stearate Nutrition 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- DGQLVPJVXFOQEV-NGOCYOHBSA-N carminic acid Chemical compound OC1=C2C(=O)C=3C(C)=C(C(O)=O)C(O)=CC=3C(=O)C2=C(O)C(O)=C1[C@H]1O[C@H](CO)[C@@H](O)[C@H](O)[C@H]1O DGQLVPJVXFOQEV-NGOCYOHBSA-N 0.000 description 1
- 239000004106 carminic acid Substances 0.000 description 1
- 229940114118 carminic acid Drugs 0.000 description 1
- 235000012730 carminic acid Nutrition 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 125000000113 cyclohexyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C([H])([H])C1([H])[H] 0.000 description 1
- 235000019329 dioctyl sodium sulphosuccinate Nutrition 0.000 description 1
- YHAIUSTWZPMYGG-UHFFFAOYSA-L disodium;2,2-dioctyl-3-sulfobutanedioate Chemical compound [Na+].[Na+].CCCCCCCCC(C([O-])=O)(C(C([O-])=O)S(O)(=O)=O)CCCCCCCC YHAIUSTWZPMYGG-UHFFFAOYSA-L 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003759 ester based solvent Substances 0.000 description 1
- UIWXSTHGICQLQT-UHFFFAOYSA-N ethenyl propanoate Chemical compound CCC(=O)OC=C UIWXSTHGICQLQT-UHFFFAOYSA-N 0.000 description 1
- 239000004210 ether based solvent Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- WBJINCZRORDGAQ-UHFFFAOYSA-N formic acid ethyl ester Natural products CCOC=O WBJINCZRORDGAQ-UHFFFAOYSA-N 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 239000001530 fumaric acid Substances 0.000 description 1
- 150000002240 furans Chemical class 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229920000159 gelatin Polymers 0.000 description 1
- 239000008273 gelatin Substances 0.000 description 1
- 235000019322 gelatine Nutrition 0.000 description 1
- 235000011852 gelatine desserts Nutrition 0.000 description 1
- 238000001879 gelation Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 229920001477 hydrophilic polymer Polymers 0.000 description 1
- 229910052588 hydroxylapatite Inorganic materials 0.000 description 1
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 description 1
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 description 1
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 description 1
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- CXORMDKZEUMQHX-UHFFFAOYSA-N kermesic acid Chemical compound O=C1C2=C(O)C(O)=CC(O)=C2C(=O)C2=C1C=C(O)C(C(O)=O)=C2C CXORMDKZEUMQHX-UHFFFAOYSA-N 0.000 description 1
- 239000005453 ketone based solvent Substances 0.000 description 1
- 239000004310 lactic acid Substances 0.000 description 1
- 235000014655 lactic acid Nutrition 0.000 description 1
- OCWMFVJKFWXKNZ-UHFFFAOYSA-L lead(2+);oxygen(2-);sulfate Chemical compound [O-2].[O-2].[O-2].[Pb+2].[Pb+2].[Pb+2].[Pb+2].[O-]S([O-])(=O)=O OCWMFVJKFWXKNZ-UHFFFAOYSA-L 0.000 description 1
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 1
- 239000011976 maleic acid Substances 0.000 description 1
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 1
- 229920000609 methyl cellulose Polymers 0.000 description 1
- 239000001923 methylcellulose Substances 0.000 description 1
- 235000010981 methylcellulose Nutrition 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229920005615 natural polymer Polymers 0.000 description 1
- 239000012875 nonionic emulsifier Substances 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- 235000006408 oxalic acid Nutrition 0.000 description 1
- 238000010979 pH adjustment Methods 0.000 description 1
- XYJRXVWERLGGKC-UHFFFAOYSA-D pentacalcium;hydroxide;triphosphate Chemical compound [OH-].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O XYJRXVWERLGGKC-UHFFFAOYSA-D 0.000 description 1
- AQIXEPGDORPWBJ-UHFFFAOYSA-N pentan-3-ol Chemical compound CCC(O)CC AQIXEPGDORPWBJ-UHFFFAOYSA-N 0.000 description 1
- 230000002688 persistence Effects 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 235000011007 phosphoric acid Nutrition 0.000 description 1
- 235000002949 phytic acid Nutrition 0.000 description 1
- 239000000467 phytic acid Substances 0.000 description 1
- 229940068041 phytic acid Drugs 0.000 description 1
- 239000004584 polyacrylic acid Substances 0.000 description 1
- 229920002689 polyvinyl acetate Polymers 0.000 description 1
- 239000011118 polyvinyl acetate Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- OTYBMLCTZGSZBG-UHFFFAOYSA-L potassium sulfate Chemical compound [K+].[K+].[O-]S([O-])(=O)=O OTYBMLCTZGSZBG-UHFFFAOYSA-L 0.000 description 1
- 229910052939 potassium sulfate Inorganic materials 0.000 description 1
- 235000011151 potassium sulphates Nutrition 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- BWJUFXUULUEGMA-UHFFFAOYSA-N propan-2-yl propan-2-yloxycarbonyloxy carbonate Chemical compound CC(C)OC(=O)OOC(=O)OC(C)C BWJUFXUULUEGMA-UHFFFAOYSA-N 0.000 description 1
- 150000004053 quinones Chemical class 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 description 1
- 235000019333 sodium laurylsulphate Nutrition 0.000 description 1
- 229940035044 sorbitan monolaurate Drugs 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 239000000375 suspending agent Substances 0.000 description 1
- 229920001059 synthetic polymer Polymers 0.000 description 1
- NMOALOSNPWTWRH-UHFFFAOYSA-N tert-butyl 7,7-dimethyloctaneperoxoate Chemical compound CC(C)(C)CCCCCC(=O)OOC(C)(C)C NMOALOSNPWTWRH-UHFFFAOYSA-N 0.000 description 1
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 description 1
- 229920001567 vinyl ester resin Polymers 0.000 description 1
- WPWWKBNOXTZDQJ-UHFFFAOYSA-N xanthopurpurin Chemical compound C1=CC=C2C(=O)C3=CC(O)=CC(O)=C3C(=O)C2=C1 WPWWKBNOXTZDQJ-UHFFFAOYSA-N 0.000 description 1
Abstract
Description
本発明は、塩化ビニルのようなビニル系単量体を重合す
る際に、重合器に重合体のスケールが付着することを防
ぐ防止剤およびそれを用いたスケール付着防止方法に関
する。The present invention relates to an inhibitor that prevents polymer scale from adhering to a polymerization vessel during polymerization of vinyl monomers such as vinyl chloride, and a method for preventing scale adhesion using the same.
塩化ビニル系重合体は、塩化ビニル単量体または塩化ビ
ニル単量体を主成分とするビニル系単量体の混合物を重
合器に仕込み、懸濁剤や重合開始剤などを含む水性媒体
中で重合して製造されている。その際、1重合器の内壁
面などに重合体がスケールとして付着することが問題に
なる。スケールが付着すると重合器の冷却能力が低下し
たり、重合体の収率が低下してしまう。さらに、スケー
ルが剥離して製品に混入すると、重合体が不均質になり
品質低下を招く。そのため、バッチ毎にスケールを除去
する必要があり、多大な労力と時間を要す。また、スケ
ールには毒性のある未反応の単量体が含まれているため
、作業には十分な注意が必要である。
重合器の内壁面へのスケール付着を防止すφ方法として
、染料や顔料をスケール防止剤として塗布する方法が特
公昭45−30835号公報に開示されている。しかし
、この方法を用いると、重合速度が低下したり、スケー
ル防止剤の塗膜が溶解して重合体が着色したり、嵩比重
が低下する等の弊害が生じることがあった。また、この
防止剤は接着力が小さく重合器壁面から剥離することが
あり、剥離部分に発生したスケールが重合体に混入する
と製品重合体の品質が低下し、得られた重合体を成形し
た際にフィッシュアイが発生してしまう。
フィッシュアイが発生した成形品は外観が劣ることのみ
ならず、強度も低い。塩化ビニル系重合体には、嵩比重
、ゲル化速度、初期着色、熱安定性等の諸特性について
も一層の品質向上が求められており、特に透明シートや
ボトルなどの成形品では、外観や強度の点から、着色が
小さく、均質でフィッシュアイが発生しないことが必要
なため、高品質な塩化ビニル系重合体を得るためのスケ
ール付着防止剤やスケール付着防止方法の開発が望まれ
ている。Vinyl chloride polymers are produced by charging vinyl chloride monomers or a mixture of vinyl monomers containing vinyl chloride monomers as the main component into a polymerization vessel, and then placing them in an aqueous medium containing a suspending agent, a polymerization initiator, etc. Manufactured by polymerization. At that time, a problem arises in that the polymer adheres as scale to the inner wall surface of the polymerization vessel. When scale adheres, the cooling capacity of the polymerization vessel decreases and the yield of the polymer decreases. Furthermore, if the scale is exfoliated and mixed into the product, the polymer will become non-uniform and quality will deteriorate. Therefore, it is necessary to remove the scale for each batch, which requires a great deal of labor and time. In addition, the scale contains unreacted monomers that are toxic, so care must be taken when working with it. As a method for preventing scale from adhering to the inner wall surface of a polymerization vessel, Japanese Patent Publication No. 45-30835 discloses a method of applying a dye or pigment as a scale inhibitor. However, when this method is used, disadvantages such as a decrease in the polymerization rate, dissolution of the coating film of the scale inhibitor and coloring of the polymer, and a decrease in bulk specific gravity may occur. In addition, this inhibitor has low adhesive strength and may peel off from the wall of the polymerization vessel, and if the scale generated at the peeled part is mixed into the polymer, the quality of the product polymer will deteriorate, and when the obtained polymer is molded. A fish eye occurs. Molded products with fish eyes not only have poor appearance but also low strength. Vinyl chloride polymers are required to further improve their properties in terms of bulk specific gravity, gelation rate, initial coloration, thermal stability, etc. Especially for molded products such as transparent sheets and bottles, appearance and From the viewpoint of strength, it is necessary that the coloring be small, homogeneous, and without fish eyes, so it is desired to develop scale adhesion prevention agents and scale adhesion prevention methods to obtain high quality vinyl chloride polymers. .
【発明が解決しようとする課題]
本発明は前記の課題を解決するためなされたもので、ビ
ニル系単量体を重合する際に、重合器内への重合体スケ
ールの(=1着を防止し、旧つ、着色やフィッシュアイ
が少な(高品質な塩化ビニル系重合体が得られる塩化ビ
ニル系重合体製造時のスケール付着防止剤およびスケー
ルイ」着防止方法を提供することを目的とする。
【課題を解決するだめの手段]
前記の目的を達成するためになされた本発明の塩化ビニ
ル系重合体製造時のスケール付着防止剤は、アントラキ
ノン系天然色素およびけん化度70モル%以上のポリビ
ニルアルコールを含んでいる。
また、本発明の塩化ビニル系重合体製造時のスケール付
着防止方法は、塩化ビニル単量体を含むビニル系単量体
を重合する際に、重合器の単量体が接する部分の少なく
とも一部に、アントラキノン系天然色素およびけん化度
70モル%以上のポリビニルアルコールを含む塗膜を形
成している。
アントラキノン系天然色素としては、例えば、テクトキ
トン、3−ヒドロキシ−2−メチルアンスラキノン、2
−ヒドロキシアンスラキノン、アリザリン、キサントプ
ルプリン、ルビアジン、ムンジスチン、クリソファン酸
、カルミン酸、ケルメシン酸、ラッカイン酸Aおよびこ
れらの誘導体が挙げられる。
ポリビニルアルコールは、壁面への残留性や附子ツマ造
膜性等を高めるために、けん化度および平均重合度百の
高いものを用いる。
けん化度は70モル%以上であることが必要であり、8
0モル%以上、さらには90モル%以上のものが好まし
い。特に98モル%以上のものが好適である。なお、け
ん化度が70モル%未満の場合は、壁面への残留性や耐
モノマ造膜性が不十分になる。
平均重合度Pは1000以上、さらには1500以上で
あることが好ましい。特に2000以上のものが好適で
ある。ポリビニルアルコールは、一種を単独で用いても
、けん化度や平均重合度が異なるものを複数種組み合わ
せても良い。
アントラキノン系天然色素とポリビニルアルコールとの
重量比は 100:0.1〜5000である。好ましく
は 100・1〜l0(10である。
本発明の重合体スケール防止剤は、適当な溶媒に溶解し
て塗布液を調製し、重合器の内壁面等に塗布、乾燥して
使用する。
溶媒は、水をはじめ、例えば、メタノール、エタノール
、プロパツール、ブタノール、2−ブタノール、2−メ
チル−1−プロパツール、2−メチル−2−プロパツー
ル、3−メチル−1−ブタノール、2−メチル−2−ブ
タノール、2−ペンタノールのようなアルコール系溶剤
、アセトン、メチルエチルケトン、メチルイソブチルケ
トンのようなケトン系溶剤、ギ酸メチル、ギ酸エチル、
酢酸メチル、アセト酢酸メチルのようなエステル系溶剤
、4−メチルジオキソラン、エチレングリコールジエチ
ルエーテルのようなエーテル系溶剤、フラン類、ジメチ
ルホルムアミド、ジメチルスルホキシド、アセトニトリ
ルのような非プロトン系溶剤が使用できる。これらは単
独で用いても複数種を混合して用いても良い。塗布液中
のアントラキノン系天然色素およびポリビニルアルコー
ルの合計濃度は、0、001〜20重量%程度に設定し
ておく。
スケール付着防止効果を高めるため、スケール付着防止
剤の塗布液に、例えば、親水性高分子(アニオン性、カ
チオン性、両性)、界面活性剤、アミン系化合物、フェ
ノール基含有化合物、キノン系化合物を添加しても良い
。
スケール付着防止剤のpHについて、特に制限はないが
、必要に応じて11)1調整剤を添加しても良い。pH
調整剤としては、例えば、硫酸、りん酸、酢酸、シュウ
酸、乳酸、p−t−ルエンスルホン酸、フィチン酸、チ
オゲルコール酸、ゲルコール酸、水酸化ナトリウム、水
酸化カリウム、アンモニア水、エチレンジアミンが挙げ
られる。
このようにして調整した塗布液は、例えば、重合器の内
壁面をはじめ、撹拌翼、撹拌軸、コンデンサ、ヘッダ、
サーチコイル、ボルト、ナツトのような、重合反応中に
単量体が接触する部位に塗布、乾燥して塗膜を形成する
。この他にも、塗布液はモノマ蒸留塔、コンデンサ、モ
ノマ貯蔵タンク、バルブ内面等のような未反応単量体の
回収系統のスケールが付着する恐れのある部位にも塗布
することが望ましい。塗布面の材質は、例えば、ステン
レス、その他のスチールおよびガラスライニングされた
面など、特に制限はない。
塗布液の塗布方法は、へケ塗り、スプレィ塗布、塗布液
で重合器を満たした後に抜き出す方法等任意である。塗
布には特開昭57−61001号公報に開示されている
ような、重合器内の上部にノズルを設けて自動的にスプ
レィ塗布する方法を用いることが出来る。特開昭59−
11303号公報に開示されているように、スケール防
止剤を水玉模様状に塗布しても良い。また、特開昭55
−36288号公報に開示されているような、キャリア
ガスとして水蒸気を用いてスケール防止剤を噴霧塗装す
る自動塗布方法を用いても良い。キャリアガスには、塩
化ビニルモノマ(特表昭56−501116号公報)を
用いても、低沸点炭化水素ガス(特表昭56−5011
17号公報)を用いても構わない。
塗布液の乾燥は室温から100℃までの温度範囲で行な
う。乾燥には、塗布後、温風を当てる方法や、重合器内
壁面等の塗布面を予め30〜80℃に加熱しておき、そ
の加熱面に塗布液を直接塗布しても良い。乾燥後は、必
要に応じて塗布面を水洗する。塗膜は、0.001g/
m2以上、特に0.05〜2 g/m”であることが好
ましい。また、上記の塗布作業は、1バツチの重合ごと
に行なっても良いが、−度形成した塗膜はかなりの耐久
性を有し、スケール付着防止作用が持続するので、塗布
作業は、通常1〜十数バツチごとに行なえば良い。
本発明のスケール付着防止剤およびスケール付着防止方
法は、重合の形式によらず適用可能であるが、懸濁重合
、特に分散剤としてポバールを含む分散系の懸濁重合に
おいて効果的である。上記のように重合器内壁等の単量
体が接触する部分に塗膜を形成した後、塩化ビニル重量
体や塩化ビニルと共重合可能な単量1体を仕込み、常法
に従って重合を実施する。その他、必要に応じて用いら
れる重合媒体や、単量体を分散させるための分散助剤等
を加えても良い。
懸濁重合の例を具体的に説明すると、重合は一般に水お
よび分散助剤を重合器に仕込んだ後、重合開始剤を入れ
、重合器内を排気して約0.1〜760mmHgに減圧
し、単量体を仕込み、必要に応じて重合中に水、分散助
剤および重合開始剤等を添加して行なわれる。分散助剤
や重合開始剤は、従来から塩化ぐニル系重合体の重合に
使用されているものが使用でき、単量体100重量部に
対し、水は約100〜500重量部、分散助剤は約0.
01〜30重量部、重合開始剤は、約0.01〜5重量
部の割合で用いる。重合温度は、通常、30〜80℃、
重合器の内圧は0.5〜30kg/Cm2程度になる。
重合反応の完了は、重合器の内圧が約O〜7 kg/c
m2に低下した時や、重合反応による発熱がなくなり、
重合器の冷却ジャケットに出入りする水の温度差がな(
なった時点で完了したと判断する。
本発明のスケール付着防止剤およびスケール付着防止方
法は、塩化ビニル単量体を含むビニル系単量体、即ち、
塩化ビニル単量体単独や、塩化ビニル単量体と塩化ビニ
ル単量体に共重合可能な他の単量体との重合に有効であ
る。塩化ビニルと共重合可能な単量体としては、例えば
、酢酸ビニルO
およびプロピオン酸ビニルのようなビニルエステル、ア
クリル酸、メタアクリル酸およびそれらのエステルの塩
、マレイン酸またはフマル酸およびそれらのエステルま
たは無水物、スチレン、アクリロニトリル、ハロゲン化
ビニリデン、ビニルエーテルが挙げられる。
また、重合系に例えば重合開始剤、分散剤、固体分散剤
、乳化剤、充填剤、安定剤、滑剤、連鎖移動剤のような
、従来から塩化ビニル系重合体の製造に用いられる各種
の添加剤が含まれていても、スケール付着防止剤は有効
に作用する。以下に具体的な物質名を列挙しておく。
重合開始剤は、例えばt−ブチルパーオキシネオデカネ
ート、ビス(2−エチルヘキシル)パーオキシジカーボ
ネート、3,5.5−トリメチルヘキサノイルパーオキ
サイド、α−クミルパーオキシネオデカネート、クメン
ハイドロパーオキサイド、シクロヘキ勺ノンパーオキザ
イド、t−ブチルパーオキシビバレート、ビス(2−エ
トキシエチル)パーオキシジカーボネート、ベンゾイル
パーオキサイド、ラウロイルパーオギサイド、2,4−
ジクロルベンゾイルパーオキ→ノ゛イド、ジイソブロビ
ルバーオギシジカーボネ−ト、a、a”−アゾビスイソ
ブチロニトリル、o、a’−アゾビス−2,4−ジメヂ
ルバレロニ1−リル、ベルオキソニ硫酸カリウム、ベル
オキソニ硫酸アンモニウム、p−メンタンハイドロパー
オキサイドが使用出来る。
分散剤は、例えばポリ酢酸ビニルの部分酸化物、ポリア
クリル酸、酢酸ビニルと無水マレイン酸の共重合体、ヒ
ドロキシプロピルメチルセルロース等のセルロース誘導
体、ゼラチン等の天然または合成高分子化合物が使用で
きる。
固体分散剤は、例えばリン酸カルシウム、ヒドロキシア
パタイトが挙げられる。
乳化剤は、例えばソルビタンモノラウレート、ソルビタ
ントリオレート、ポリオキシエチレンアルギルエーテル
のようなノニオン性乳化剤、ラウリル硫酸ナトリウム、
ドデシルベンゼンスルホン酸ナトリウム等のアルキルベ
ンゼンスルホン酸ナトリウム、ジオクチルスルホコハク
酸ナトリウムのようなアニオン性乳化剤が挙げられる。
充填剤は、例えば炭酸カルシウム、酸化チタン等が挙げ
られる。
安定剤は、例えば三塩基性硫酸鉛、ステアリン酸カルシ
ウム、ジプチルすずジラウレート、ジオクチルすずメチ
ル力ブチドが使用可能である。
滑剤は、例えばライスワックス、ステアリン酸、セチル
アルコールが挙げられる。
可塑剤は、例えばジオクチルフタレート、ジブチルフタ
レートが挙げられる。
連鎖移動剤は、例えばトリクロロエチレン、メルカプタ
ン類が挙げられる。
【作用】
重合器を用いて塩化ビニル系重合体を製造する際に、重
合器内壁のような単量体が接触する部分に本発明のスケ
ール付着防止剤の塗膜を形成しておけば、重合体スケー
ルの付着が防止される。[Problems to be Solved by the Invention] The present invention has been made to solve the above-mentioned problems, and it prevents polymer scale from entering the polymerization vessel when polymerizing vinyl monomers. The purpose of the present invention is to provide a scale adhesion preventive agent and a method for preventing scale adhesion during the production of vinyl chloride polymers that produce high-quality vinyl chloride polymers with less discoloration and fish eyes. [Means for Solving the Problems] The scale adhesion inhibitor of the present invention, which has been made to achieve the above object, is an anthraquinone natural pigment and polyvinyl having a saponification degree of 70 mol% or more. In addition, the method for preventing scale adhesion during the production of vinyl chloride polymers of the present invention is such that when polymerizing vinyl monomers including vinyl chloride monomers, the monomers in the polymerization vessel are A coating film containing an anthraquinone natural pigment and polyvinyl alcohol with a saponification degree of 70 mol% or more is formed on at least a part of the contacting area. Examples of the anthraquinone natural pigment include tectochitone, 3-hydroxy-2-methyl anthraquinone, 2
-Hydroxyanthraquinone, alizarin, xanthopurpurin, rubiazin, mundistin, chrysophane acid, carminic acid, kermesic acid, laccaic acid A and derivatives thereof. Polyvinyl alcohol with a high degree of saponification and average degree of polymerization is used in order to improve the persistence on the wall surface and the ability to form a sticky film. The saponification degree needs to be 70 mol% or more, and 8
It is preferably 0 mol% or more, more preferably 90 mol% or more. Particularly preferred is 98 mol% or more. Note that if the degree of saponification is less than 70 mol%, the residual property on the wall surface and the monomer film formation resistance will be insufficient. The average degree of polymerization P is preferably 1000 or more, more preferably 1500 or more. Particularly preferred is one with a value of 2000 or more. One kind of polyvinyl alcohol may be used alone, or a plurality of polyvinyl alcohols having different saponification degrees and average degrees of polymerization may be used in combination. The weight ratio of anthraquinone natural pigment to polyvinyl alcohol is 100:0.1 to 5000. Preferably, it is 100·1 to 10 (10). The polymer scale inhibitor of the present invention is dissolved in a suitable solvent to prepare a coating solution, which is applied to the inner wall surface of a polymerization vessel, etc., and dried for use. Solvents include water, and examples include methanol, ethanol, propatool, butanol, 2-butanol, 2-methyl-1-propatool, 2-methyl-2-propatool, 3-methyl-1-butanol, 2- Alcohol solvents such as methyl-2-butanol and 2-pentanol, ketone solvents such as acetone, methyl ethyl ketone, and methyl isobutyl ketone, methyl formate, ethyl formate,
Ester solvents such as methyl acetate and methyl acetoacetate, ether solvents such as 4-methyldioxolane and ethylene glycol diethyl ether, and aprotic solvents such as furans, dimethylformamide, dimethyl sulfoxide, and acetonitrile can be used. These may be used alone or in combination. The total concentration of anthraquinone natural dye and polyvinyl alcohol in the coating liquid is set to about 0,001 to 20% by weight. In order to enhance the scale adhesion prevention effect, for example, hydrophilic polymers (anionic, cationic, amphoteric), surfactants, amine compounds, phenol group-containing compounds, and quinone compounds are added to the scale adhesion prevention agent coating solution. May be added. There are no particular restrictions on the pH of the scale adhesion inhibitor, but a 11) 1 regulator may be added as necessary. pH
Examples of the regulator include sulfuric acid, phosphoric acid, acetic acid, oxalic acid, lactic acid, pt-toluenesulfonic acid, phytic acid, thiogelcholic acid, gelcholic acid, sodium hydroxide, potassium hydroxide, aqueous ammonia, and ethylenediamine. It will be done. The coating liquid prepared in this way can be applied to, for example, the inner wall of the polymerization vessel, stirring blades, stirring shafts, condensers, headers, etc.
It is applied to areas that come into contact with the monomer during the polymerization reaction, such as search coils, bolts, and nuts, and is dried to form a coating film. In addition to this, it is also desirable to apply the coating liquid to parts of the unreacted monomer recovery system, such as monomer distillation columns, condensers, monomer storage tanks, valve inner surfaces, etc., where scale may adhere. The material of the coated surface is not particularly limited, and may include, for example, stainless steel, other steel, and a glass-lined surface. The coating liquid may be applied by any method such as brushing, spray coating, filling the polymerization vessel with the coating liquid and then drawing it out. For the coating, a method such as that disclosed in Japanese Unexamined Patent Publication No. 57-61001, in which a nozzle is provided in the upper part of the polymerization vessel and automatic spray coating can be used, can be used. Unexamined Japanese Patent Publication 1987-
As disclosed in Japanese Patent No. 11303, the scale preventive agent may be applied in a polka dot pattern. Also, JP-A-55
An automatic coating method such as that disclosed in Japanese Patent No. 36288, in which the scale inhibitor is sprayed using water vapor as a carrier gas, may be used. Even if vinyl chloride monomer (Japanese Patent Publication No. 56-501116) is used as the carrier gas, low-boiling hydrocarbon gas (Japanese Patent Publication No. 56-5011) may be used as the carrier gas.
No. 17 Publication) may be used. The coating liquid is dried at a temperature ranging from room temperature to 100°C. For drying, hot air may be applied after coating, or the coated surface such as the inner wall of the polymerization vessel may be heated to 30 to 80° C. in advance, and the coating liquid may be directly coated on the heated surface. After drying, wash the coated surface with water if necessary. The coating film is 0.001g/
m2 or more, especially 0.05 to 2 g/m".Also, the above coating operation may be performed for each batch of polymerization, but the coating film formed once has considerable durability. , and the scale adhesion prevention effect lasts, so the application work can usually be carried out every 1 to 10 batches. The scale adhesion preventive agent and scale adhesion prevention method of the present invention can be applied regardless of the type of polymerization. Although it is possible, it is effective in suspension polymerization, especially in suspension polymerization of dispersion systems containing Poval as a dispersant.As mentioned above, a coating film is formed on the parts where the monomers come into contact, such as the inner wall of the polymerization vessel. After that, heavy vinyl chloride and one monomer copolymerizable with vinyl chloride are charged, and polymerization is carried out according to a conventional method.Other polymerization media and dispersion for dispersing the monomers are used as necessary. Auxiliary agents, etc. may be added.To give a concrete example of suspension polymerization, polymerization is generally carried out by charging water and a dispersion aid into a polymerization vessel, then adding a polymerization initiator, and then evacuating the inside of the polymerization vessel. The pressure is reduced to approximately 0.1 to 760 mmHg, monomers are charged, and water, a dispersion aid, a polymerization initiator, etc. are added as necessary during polymerization.Dispersion aids and polymerization initiators are conventionally used. Those used in the polymerization of vinyl chloride-based polymers can be used.For 100 parts by weight of the monomer, the amount of water is about 100 to 500 parts by weight, and the amount of dispersion aid is about 0.
The polymerization initiator is used in an amount of about 0.01 to 30 parts by weight, and the polymerization initiator is used in an amount of about 0.01 to 5 parts by weight. The polymerization temperature is usually 30 to 80°C,
The internal pressure of the polymerization vessel is approximately 0.5 to 30 kg/Cm2. The polymerization reaction is completed when the internal pressure of the polymerization vessel is approximately 0 to 7 kg/c.
When the temperature drops to m2, there is no heat generated by the polymerization reaction,
There is no temperature difference between the water entering and exiting the cooling jacket of the polymerization reactor (
It is considered complete when the The scale adhesion prevention agent and scale adhesion prevention method of the present invention utilize vinyl monomers containing vinyl chloride monomers, that is,
It is effective for polymerizing vinyl chloride monomer alone or vinyl chloride monomer and other monomers that can be copolymerized with vinyl chloride monomer. Monomers copolymerizable with vinyl chloride include, for example, vinyl esters such as vinyl acetate O and vinyl propionate, salts of acrylic acid, methacrylic acid, and their esters, maleic acid or fumaric acid, and their esters. Or anhydride, styrene, acrylonitrile, vinylidene halide, vinyl ether. In addition, various additives conventionally used in the production of vinyl chloride polymers, such as polymerization initiators, dispersants, solid dispersants, emulsifiers, fillers, stabilizers, lubricants, and chain transfer agents, are added to the polymerization system. The scale adhesion inhibitor works effectively even if it contains. Specific substance names are listed below. Examples of the polymerization initiator include t-butylperoxyneodecanate, bis(2-ethylhexyl)peroxydicarbonate, 3,5.5-trimethylhexanoyl peroxide, α-cumylperoxyneodecanate, and cumene hydroperoxide. oxide, cyclohexyl nonperoxide, t-butyl peroxybivalate, bis(2-ethoxyethyl) peroxydicarbonate, benzoyl peroxide, lauroyl peroxide, 2,4-
Dichlorobenzoyl peroxide→noid, diisobrobyl bicarbonate, a, a''-azobisisobutyronitrile, o, a'-azobis-2,4-dimethylvaleroni-1-lyl, beroxonitrile Potassium sulfate, ammonium peroxonisulfate, and p-menthane hydroperoxide can be used.Dispersants include, for example, partial oxide of polyvinyl acetate, polyacrylic acid, copolymers of vinyl acetate and maleic anhydride, and cellulose such as hydroxypropyl methyl cellulose. Natural or synthetic polymer compounds such as derivatives and gelatin can be used. Solid dispersants include, for example, calcium phosphate and hydroxyapatite. Emulsifiers include, for example, sorbitan monolaurate, sorbitan triolate, and polyoxyethylene argyl ether. Nonionic emulsifier, sodium lauryl sulfate,
Examples include sodium alkylbenzenesulfonates such as sodium dodecylbenzenesulfonate, and anionic emulsifiers such as sodium dioctylsulfosuccinate. Examples of fillers include calcium carbonate and titanium oxide. Stabilizers that can be used include, for example, tribasic lead sulfate, calcium stearate, diptyltin dilaurate, and dioctyltin methyl butide. Examples of the lubricant include rice wax, stearic acid, and cetyl alcohol. Examples of the plasticizer include dioctyl phthalate and dibutyl phthalate. Examples of chain transfer agents include trichlorethylene and mercaptans. [Function] When producing a vinyl chloride polymer using a polymerization vessel, if a coating film of the scale adhesion prevention agent of the present invention is formed on the portions that come into contact with monomers, such as the inner wall of the polymerization vessel, Adhesion of polymer scale is prevented.
以下、本発明の詳細な説明する。
・スケール付着防止剤の調製
後述の第1表に示す組成比に従い、アントラキノン系天
然色素およびポリビニルアルコールを溶媒に溶解し、p
l+調整剤を加え、スケール付着防止剤の塗布液を調整
する。第1表に、各実施例および比較例に使用するアン
トラキノン系天然色素(成分A)とポリビニルアルコー
ル(成分B)の種類、それらの重量比、溶媒(溶媒の組
成比)、合計濃度、pH調整剤および塗布液のpHを示
す。ポリビニルアルコールは、第2表に示す市販品を使
用した。 ・
・重合試験
得られた塗布液を、内容積1000℃の撹拌器付ステン
レス製重合器の内壁、撹拌軸、撹拌翼その他車量体が接
触する部位に噴霧器を用いて塗布し、ジャケットを50
°Cに設定して10分間加熱、乾燥した後、水洗して塗
膜を形成する。
このようにしてスケール防止処理を施した重合器に、水
400kg 、塩化ビニル単量体200kg 、部分け
ん化ポリビニルアルコール250g、ヒドロキシブロビ
ルメチルセルロース25gおよびジイソプロピルパーオ
キシジカーボネート75gを仕込み、撹拌しながら57
℃で常法に従って重合を行なった。
・スケール付着量の測定
重合終了後、重合器内壁面に付着した重合体スケールを
壁面より掻き落とし、壁面1rrf’当たりの重量を測
定する。
・明度指数(L値)の測定
次に、各実施例および比較例で得られた重合体の明度指
数を測定し、着色の有無を判定する。明度指数は以下の
方法で測定した。
塩化ビニル系重合体100重量部、安定剤(昭島化学社
製、TS−101) 1重量部、安定剤(勝田化工社製
、C−100J) 0.5重皿部および可塑剤として
ジオクチルフタレート50重量部を2本ロールミルを用
いて160℃で5分間混練した後、厚さ1mmのシート
を成形する。次に成形したシートを4×4×1.5cm
の型枠に入れ、160’c、65〜70Jf/c+n2
で加熱、加圧成形して測定用試料を作成する。この試料
ニツイテ、JIS Z 8730f19801ニ記載ノ
ハンターの色差式における明度指数りを求め、L値が大
きい程白色度が高いと評価した。
[、値は次のようにして求める。
JIS 28722の記載に従って、標準光C1光電色
彩計(日本電色工業株式会社製、Z−1001DP型潤
色色差計)を用い、刺激値直読方法により、xYZ表色
系の刺激値Yを求める。照明および受光の幾何学的条件
としては1.IIS Z 8722(7) 4.3.1
項二記載の条件dを採用した。刺激値Yを、JIS
Z 8730(1980)に記載の、式、L = IO
Y ””に代入すればL値が算出される。第1表に結果
を示す。
・フィッシュアイの測定
重合体100重量部、ジオクチルフタレート50重量部
、ジブデルすずジラウレート1重量部、セチルアルコー
ル1重量部、酸化チタン0.25重量部およびカーボン
ブラック0.05重量部の混合物を150℃の2本ロー
ルで7分間混練した後、厚さ0.2mmのシートを作成
し、光透過法によりシート100cm2当りのフィッシ
ュアイの個数を計測した。
・嵩比重の測定
得られた重合体の嵩比重をJIS K−6721規定の
方法で測定した。
第1表に、スケール付着量、明度指数およびフィッシュ
アイ、第3表に嵩比重の測定結果を示す。なお実施例1
〜18は本発明を適用する例、比較例1〜5は本発明を
適用外の例である。
(以下余白)
第2表
第 3 表
これらの試験結果によれば、各実施例で重合された塩化
ビニル系重合体は、明度指数りが70以上と白色度が高
く着色が少ないことがわかる。また、フィッシュアイが
少なく高品質である。The present invention will be explained in detail below.・Preparation of scale adhesion inhibitor According to the composition ratio shown in Table 1 below, anthraquinone natural pigment and polyvinyl alcohol are dissolved in a solvent, and p
1+ regulator is added to adjust the coating solution of the scale adhesion preventive agent. Table 1 shows the types of anthraquinone natural pigment (component A) and polyvinyl alcohol (component B) used in each example and comparative example, their weight ratio, solvent (composition ratio of solvent), total concentration, and pH adjustment. The pH of the agent and coating solution is shown. As polyvinyl alcohol, commercially available products shown in Table 2 were used.・ ・Polymerization test The obtained coating liquid was applied using a sprayer to the inner wall of a stainless steel polymerization vessel with an internal volume of 1000°C equipped with a stirrer, the stirring shaft, stirring blades, and other parts that come into contact with the vehicle body, and the jacket was heated to 50°C.
After heating and drying at a temperature of °C for 10 minutes, the film is washed with water to form a coating film. Into a polymerization vessel subjected to scale prevention treatment in this way, 400 kg of water, 200 kg of vinyl chloride monomer, 250 g of partially saponified polyvinyl alcohol, 25 g of hydroxybrobyl methylcellulose, and 75 g of diisopropyl peroxydicarbonate were charged, and while stirring,
Polymerization was carried out at ℃ according to a conventional method. - Measurement of scale adhesion amount After the polymerization is completed, the polymer scale adhering to the inner wall surface of the polymerization vessel is scraped off from the wall surface, and the weight per wall surface 1rrf' is measured. -Measurement of lightness index (L value) Next, the lightness index of the polymers obtained in each example and comparative example was measured to determine the presence or absence of coloration. The brightness index was measured by the following method. 100 parts by weight of vinyl chloride polymer, 1 part by weight of stabilizer (manufactured by Akishima Kagaku Co., Ltd., TS-101), 0.5 parts by weight of stabilizer (manufactured by Katsuta Kako Co., Ltd., C-100J) and 50 dioctyl phthalate as a plasticizer. After kneading the weight parts using a two-roll mill at 160°C for 5 minutes, a sheet with a thickness of 1 mm is formed. Next, the formed sheet is 4 x 4 x 1.5 cm.
Put it in the formwork, 160'c, 65~70Jf/c+n2
A sample for measurement is created by heating and pressure molding. The brightness index of this sample was determined according to the Hunter color difference formula described in JIS Z 8730f19801, and it was evaluated that the larger the L value, the higher the whiteness. [, the value is determined as follows. In accordance with the description of JIS 28722, the stimulus value Y in the xYZ color system is determined by the stimulus value direct reading method using a standard light C1 photoelectric colorimeter (manufactured by Nippon Denshoku Industries Co., Ltd., Z-1001DP model color difference meter). The geometrical conditions for illumination and light reception are 1. IIS Z 8722(7) 4.3.1
Condition d described in Section 2 was adopted. Stimulus value Y, JIS
Z 8730 (1980), the formula, L = IO
By substituting it into Y ``'', the L value is calculated. Table 1 shows the results.・Measurement of Fish Eye A mixture of 100 parts by weight of polymer, 50 parts by weight of dioctyl phthalate, 1 part by weight of dibdeltin dilaurate, 1 part by weight of cetyl alcohol, 0.25 parts by weight of titanium oxide and 0.05 parts by weight of carbon black was heated at 150°C. After kneading for 7 minutes using two rolls, a sheet with a thickness of 0.2 mm was prepared, and the number of fish eyes per 100 cm 2 of the sheet was measured by a light transmission method. - Measurement of bulk specific gravity The bulk specific gravity of the obtained polymer was measured according to the method specified in JIS K-6721. Table 1 shows the measurement results of scale adhesion amount, lightness index, and fish eye, and Table 3 shows the measurement results of bulk specific gravity. Note that Example 1
Comparative Examples 1 to 18 are examples to which the present invention is applied, and Comparative Examples 1 to 5 are examples to which the present invention is not applied. (The following is a blank space) Table 2 Table 3 According to these test results, it can be seen that the vinyl chloride polymers polymerized in each example had a high brightness index of 70 or more, a high degree of whiteness, and little discoloration. It also has high quality with fewer fish eyes.
以上、詳細に説明したように1本発明の塩化ビニル系重
合体製造時のスケール付着防止剤は、重合に使用される
単量体や添加剤の種類、重合器の材質にかかわらず、重
合体スケールの付着を防止することが出来る。このスケ
ール付着防止剤は重合系に溶解しないため、着色がなく
白色度の高い塩化ビニル系重合体が得られる。また、本
発明のスケール付着防止方法によれば、スケール付着が
防止されるために、製品である重合体にスケールが混入
することがな(、フィッシュアイが発生しに(い高品質
な塩化ビニル系重合体を製造することが出来る。さらに
、スケールの除去作業を重合のバッチ毎に行なう必要が
なく、生産性が高い。As explained in detail above, the scale adhesion inhibitor of the present invention during the production of vinyl chloride polymers can be applied to the polymer regardless of the type of monomers and additives used in the polymerization, or the material of the polymerization vessel. It is possible to prevent scale adhesion. Since this scale adhesion inhibitor does not dissolve in the polymerization system, a vinyl chloride polymer with no coloration and high whiteness can be obtained. In addition, according to the method for preventing scale adhesion of the present invention, since scale adhesion is prevented, scale is not mixed into the polymer product (and fish eyes are not generated). Furthermore, there is no need to perform scale removal work for each batch of polymerization, resulting in high productivity.
Claims (1)
%以上のポリビニルアルコールを含むことを特徴とする
塩化ビニル系重合体製造時のスケール付着防止剤。 2、塩化ビニル単量体を含むビニル系単量体を重合する
際に、重合器の単量体が接する部分の少なくとも一部に
、アントラキノン系天然色素およびけん化度70モル%
以上のポリビニルアルコールを含む塗膜を形成すること
を特徴とする塩化ビニル系重合体製造時のスケール付着
防止方法。[Scope of Claims] 1. A scale adhesion preventive agent for the production of vinyl chloride polymers, which comprises an anthraquinone natural dye and polyvinyl alcohol with a degree of saponification of 70 mol% or more. 2. When polymerizing vinyl monomers containing vinyl chloride monomers, anthraquinone natural dyes and saponification degree of 70 mol% are added to at least a part of the part of the polymerization vessel that is in contact with the monomers.
A method for preventing scale adhesion during production of a vinyl chloride polymer, the method comprising forming a coating film containing the above polyvinyl alcohol.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP28126490A JPH04154801A (en) | 1990-10-19 | 1990-10-19 | Agent for preventing deposition of scale in production of vinyl chloride polymer and prevention process |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP28126490A JPH04154801A (en) | 1990-10-19 | 1990-10-19 | Agent for preventing deposition of scale in production of vinyl chloride polymer and prevention process |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH04154801A true JPH04154801A (en) | 1992-05-27 |
Family
ID=17636653
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP28126490A Pending JPH04154801A (en) | 1990-10-19 | 1990-10-19 | Agent for preventing deposition of scale in production of vinyl chloride polymer and prevention process |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH04154801A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5691428A (en) * | 1993-06-15 | 1997-11-25 | Shin-Etsu Chemical Co., Ltd. | Process for producing a polymer using a quinone compound condensation product polymer scale preventive agent |
-
1990
- 1990-10-19 JP JP28126490A patent/JPH04154801A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5691428A (en) * | 1993-06-15 | 1997-11-25 | Shin-Etsu Chemical Co., Ltd. | Process for producing a polymer using a quinone compound condensation product polymer scale preventive agent |
US5889103A (en) * | 1993-06-15 | 1999-03-30 | Shin-Etsu Chemical Co., Ltd. | Polymer scale preventive agent comprising a condensation product of a quinone compound |
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