ʻO ka sodium carboxymethyl cellulose, i kapa ʻia ʻo carboxymethyl cellulose (CMC) he ʻano o ka polymer fiber ether i hoʻomākaukau ʻia e ka hoʻololi kemika o ka cellulose maoli. ʻO kona kūkulu ʻana ʻo ia ka D-glucose unit ma o β (1→4) Hoʻopili pū ʻia nā kī.
ʻO ka CMC keʻokeʻo a i ʻole ka waiū keʻokeʻo fibrous pauka a i ʻole granules, me ka mānoanoa o 0.5-0.7 g/cm3, aneane ʻole, ʻono ʻole, a me ka hygroscopic. Hoʻopuehu maʻalahi i loko o ka wai e hana i kahi hopena colloidal akaka, hiki ʻole ke hoʻoheheʻe ʻia i loko o nā mea hoʻoheheʻe kūlohelohe e like me ka ethanol. ʻO ka pH o 1% aqueous solution he 6.5-8.5, i ka pH>10 a i ʻole <5, e emi nui ka viscosity o ka mucilage, a ʻoi aku ka maikaʻi o ka hana i ka pH = 7. Paʻa i ka wela, piʻi koke ka viscosity ma lalo o 20°C, a loli mālie ma 45°C. ʻO ka hoʻomehana lōʻihi ma luna o 80 ° C hiki ke denature i ka colloid a hoʻemi nui i ka viscosity a me ka hana. Hiki ke hoʻoheheʻe ʻia i loko o ka wai a ʻike maopopo ka hopena; He paʻa loa ia i ka hopena alkaline, akā hiki ke hoʻoheheʻe ʻia i ka wā e hālāwai ai me ka waikawa, a e hoʻoheheʻe ʻia i ka wā o ka pH waiwai he 2-3, a e hana pū me nā paʻakai metala multivalent.
Ke kumu hoʻohālike: C6H7(OH)2OCH2COONa Pūnaehana Molekula: C8H11O5Na
ʻO ka hopena nui: ʻo ka cellulose maoli e hana mua i ka hopena alkalinization me NaOH, a me ka hoʻohui ʻana i ka waika chloroacetic, ʻo ka hydrogen ma ka pūʻulu hydroxyl ma ka ʻāpana glucose e hoʻololi i ka hopena me ka hui carboxymethyl i loko o ka waikawa chloroacetic. Hiki ke ʻike ʻia ma ke ʻano hoʻohālikelike he ʻekolu pūʻulu hydroxyl ma kēlā me kēia ʻāpana glucose, ʻo ia hoʻi, C2, C3, a me C6 pūʻulu hydroxyl. Hoʻololi ʻia ka hydrogen ma kēlā me kēia hui hydroxyl e ka carboxymethyl, i wehewehe ʻia he degere o ka hoʻololi ʻana o 3. ʻO ke degere o ka hoʻololi ʻana o CMC pili pono i ka solubility, emulsification, thickening, stability, acid resistance a me ka paʻakai paʻakai oCMC .
Ua manaʻoʻiʻo ʻia i ka wā e pili ana ka degere o ka hoʻololi ʻana ma kahi o 0.6-0.7, ʻoi aku ka maikaʻi o ka hana emulsifying, a me ka piʻi ʻana o ke degere o ka hoʻololi ʻana, hoʻomaikaʻi ʻia nā waiwai ʻē aʻe e like me ia. Ke ʻoi aku ka nui o ka hoʻololi ʻana ma mua o 0.8, ua hoʻonui nui ʻia kona kūpaʻa waika a me ka paʻakai. .
Eia kekahi, ua ʻōlelo ʻia ma luna nei he ʻekolu pūʻulu hydroxyl ma kēlā me kēia ʻāpana, ʻo ia hoʻi, nā pūʻulu hydroxyl lua o C2 a me C3 a me ka pūʻulu hydroxyl mua o C6. Ma ke kumumanaʻo, ʻoi aku ka nui o ka hana o ka pūʻulu hydroxyl mua ma mua o ka hui hydroxyl lua, akā e like me ka hopena isotopic o C, ʻo ka hui -OH ma C2 ʻOi aku ka waikawa, ʻoi aku ka nui o ke kaiapuni o ka alkali ikaika, kāna hana. ʻoi aku ka ikaika ma mua o C3 a me C6, no laila ʻoi aku ka maʻalahi o ka hoʻololi ʻana i nā hopena, a ukali ʻia e C6, a ʻo C3 ka nāwaliwali loa.
ʻO kaʻoiaʻiʻo,ʻaʻole pili wale ka hana o CMC i ke kiʻekiʻe o ka hoʻololiʻana, akā, i ka likeʻole o ka māheleʻana o nā hui carboxymethyl i loko o ka mole cellulose holoʻokoʻa a me ka hoʻololiʻana o nā hui hydroxymethyl i kēlā me kēia me C2, C3, a me C6 i loko. kēlā me kēia mole. pili i ka lokahi. No ka mea, ʻo CMC kahi hui laina polymerized nui, a ʻo kāna hui carboxymethyl he hoʻololi like ʻole i loko o ka mole, ʻokoʻa nā ʻano o nā moleke i ka wā i waiho ʻia ai ka hopena, a ʻokoʻa ka lōʻihi o ka mole mole laina ke loaʻa ka ikaika shear i ka hopena. . Hiki i ka axis ke huli i ke ala kahe, a ʻoi aku ka ikaika o kēia ʻano me ka piʻi ʻana o ka shear rate a hiki i ka hoʻonohonoho ʻana o ka hoʻonohonoho hope. ʻO kēia hiʻohiʻona o CMC i kapa ʻia ʻo pseudoplasticity. ʻO ka pseudoplasticity o CMC he mea kūpono ia i ka homogenization a me ka pipeline transport, a ʻaʻole ia e ʻono i ka momona i ka waiū wai, kahi kūpono i ka hoʻokuʻu ʻana i ka ʻala waiu. .
No ka hoʻohana ʻana i nā huahana CMC, pono mākou e ʻike maikaʻi i nā ʻāpana nui e like me ke kūpaʻa, viscosity, acid resistance, a me viscosity. E ʻike pehea mākou e koho ai i ka huahana kūpono.
ʻO nā huahana CMC haʻahaʻa haʻahaʻa he ʻono hōʻoluʻolu, haʻahaʻa viscosity, a aneane ʻaʻohe manaʻo mānoanoa. Hoʻohana nui ʻia lākou i nā kīʻaha kūikawā a me nā mea inu. He koho maikaʻi nō hoʻi nā wai waha olakino.
Hoʻohana nui ʻia nā huahana CMC medium-viscosity i nā mea inu paʻa, nā mea inu protein maʻamau a me nā wai hua. Pehea e koho ai ma muli o nā maʻamau pilikino o nā ʻenekinia. I ka paʻa o nā mea inu waiu, ua hāʻawi nui ʻo CMC.
Loaʻa i nā huahana CMC kiʻekiʻe-viscosity kahi wahi noi nui. Ke hoʻohālikelike ʻia me ka starch, guar gum, xanthan gum a me nā huahana ʻē aʻe, ʻike ʻia ke kūpaʻa o CMC, ʻoi aku ka nui o nā huahana ʻiʻo, ʻoi aku ka maopopo o ka pono o ka mālama ʻana i ka wai o CMC! Ma waena o nā stabilizers e like me ka ice cream, he koho maikaʻi nō hoʻi ʻo CMC.
ʻO nā hōʻailona nui e ana i ka maikaʻi o ka CMC ʻo ke degere o ka hoʻololi (DS) a me ka maʻemaʻe. ʻO ka maʻamau, ʻokoʻa nā waiwai o CMC inā ʻokoʻa ka DS; ʻoi aku ka kiʻekiʻe o ke kiʻekiʻe o ka hoʻololi ʻana, ʻoi aku ka ikaika o ka solubility, a ʻoi aku ka maikaʻi o ka ʻike a me ka paʻa o ka hopena. Wahi a nā hōʻike, ʻoi aku ka maikaʻi o ka ʻike o ka CMC i ka wā o ka degere o ka hoʻololi ʻana he 0.7-1.2, a ʻo ka viscosity o kāna hoʻonā wai ka mea nui loa i ka wā o ka pH waiwai he 6-9.
I mea e hōʻoia ai i kona maikaʻi, ma waho aʻe o ke koho ʻana i ka mea etherification, pono e noʻonoʻo ʻia kekahi mau mea e pili ana i ke ʻano o ka hoʻololi ʻana a me ka maʻemaʻe, e like me ka pilina ma waena o ka nui o ka alkali a me ka etherification agent, ka manawa etherification, ka wai i loko. ka ʻōnaehana, ka mahana, ka waiwai DH, ka hoʻonā Concentration a me ka paʻakai etc.
ʻO ka maikaʻi o nā huahana hoʻopau CMC e hilinaʻi nui ʻia i ka hopena o ka huahana. Inā maopopo ka hopena o ka huahana, he liʻiliʻi nā ʻāpana gel, manuahi manuahi, a me nā wahi ʻeleʻele o nā haumia, ua hōʻoia maoli ʻia ka maikaʻi o ka CMC. Inā waiho ʻia ka hopena no kekahi mau lā, ʻaʻole ʻike ʻia ka hopena. He keʻokeʻo a ʻeleʻele paha, akā maopopo loa, ʻoi aku ka maikaʻi o ka huahana!
Ka manawa hoʻouna: Dec-14-2022