Ke kaʻina hana o ultra-high viscosity sodium carboxymethyl cellulose

1. Ke kumu nui o ka hana CMC

(1) Ka nui o ka hoʻohana ʻana (ke ʻano solvent, i helu ʻia i kēlā me kēia tona o ka huahana): nā liters pulupulu, 62.5kg; ethanol, 317.2kg; alkali (44.8%), 11.1kg; monochloroacetic acid, 35.4kg; toluene, 310.2kg,

(2) Ke kumu hana a me ke ʻano? Hana ʻia ka alkaline cellulose mai ka cellulose a me ka sodium hydroxide aqueous solution a i ʻole ka sodium hydroxide aqueous ethanol solution, a laila hana ʻia me ka waikawa monochloroacetic a i ʻole ka sodium monochloroacetate e loaʻa ai kahi huahana maʻemaʻe, a ua maloʻo ka huahana alkaline, Pulverized i loaʻa i ke kālepa carboxymethyl cellulose (waina paʻakai sodium. ). Hoʻopau ʻia ka huahana ʻōpala, holoi ʻia, a wehe ʻia ka sodium chloride, a laila maloʻo a ʻoki ʻia no ka loaʻa ʻana o ka sodium carboxymethyl cellulose. Penei ke ano kemika:

(C6H9O4-OH)4+nNaOH-(C6H9O4-ONa)n+nH2O

(3) wehewehe kaʻina hana

Hoʻopili ʻia ka cellulose a hoʻokuʻu ʻia i loko o ka ethanol, e hoʻohui i ka lye me 30 ua ma lalo o ka hoʻoulu ʻana mau, mālama i 28-32°C, hoʻomaha i kahi mahana haʻahaʻa, hoʻohui i ka waika monochloroacetic, wela a hiki i 55°C no 1.5h a pane no 4h; e hoʻohui i ka acetic acid e hoʻopau i ka hui ʻana o ka hopena , Loaʻa ka huahana crude ma o ka hoʻokaʻawale ʻana i ka mea hoʻoheheʻe, a holoi ʻia ka huahana crude i ʻelua mau manawa me ka wai methanol i loko o ka mea holoi holoi i haku ʻia me kahi mixer a me kahi centrifuge, a maloʻo e loaʻa ka huahana.

ʻO ka hopena CMC he viscosity kiʻekiʻe, a ʻaʻole e hoʻololi ka hoʻololi ʻana i ka mahana.

2. Ke kaʻina hana o ultra-high viscosity sodium carboxymethyl cellulose

  He kaʻina hana o ka ultra-high viscosity sodium carboxymethyl cellulose.

ʻanuʻu:

(1) E hoʻokomo i ka cellulose, alkali a me ka ethanol i loko o ka kneader alkalization e like me ka hoʻokō ʻana i ka alkalization ma lalo o ka pale o ka nitrogen, a laila hoʻokomo i loko o ka etherifying agent chloroacetic acid ethanol solution e hoʻoheheʻe mua i nā mea;

(2) Lawe i nā mea i luna aʻe i loko o ka etherification kneader e hoʻomalu i ka mahana a me ka manawa pane no ka hopena etherification, a lawe i nā mea i ka pahu holoi ma hope o ka pau ʻana o ka hopena etherification;

(3) E holoi i ka etherification reaction me ka dilute ethanol solution e wehe i ka paʻakai i hana ʻia e ka hopena, i hiki ai ka maʻemaʻe o ka huahana ma mua o 99.5%;

(4) A laila, hoʻokomo ʻia ka mea i ke kaomi centrifugal, a lawe ʻia ka mea paʻa i ka mea huki, a lawe ʻia ka solvent ethanol mai ka mea ma o ka mea huki;

(5) ʻO ka mea i hele i loko o ka mea huki e komo i loko o ka moena wai hoʻomaloʻo no ka hoʻomaloʻo ʻana e wehe i ka wai nui, a laila paʻi i ka loaʻa ʻana o ka huahana. ʻO ka pōmaikaʻi, ʻo ia ka maikaʻi o ke kaʻina hana, hiki i ka helu helu huahana ke hiki i ka viscosity o 1% B type> 10000mpa.s, a me ka maʻemaʻe> 99.5%.

  ʻO ka Carboxymethyl cellulose kahi derivative me ka ether structure i loaʻa ma ka hoʻololi kemika o ka cellulose maoli. Hiki i ka hui carboxyl ma ke kaulahao molekula ke hana i paakai. ʻO ka paʻakai maʻamau ka paʻakai sodium, ʻo ia hoʻi ka sodium carboxymethyl cellulose (Na -CMC), i kapa mau ʻia ʻo CMC, he ionic ether. ʻO ka CMC kahi pauka wai nui, keʻokeʻo a i ʻole melemele māmā i ka helehelena, ʻono ʻole, ʻala ʻole, ʻaʻohe mea ʻawaʻawa, ʻaʻole hiki ke puhi ʻia, ʻaʻole-mildew, a paʻa i ka māmā a me ka wela.