Hoʻokaʻawale ʻia ka viscosity o ka sodium carboxymethyl cellulose i nā papa he nui e like me nā hoʻohana like ʻole. ʻO ka viscosity o ka holoi holoi ʻana ʻo 10 ~ 70 (ma lalo o 100), ʻo ka palena kiʻekiʻe o ka viscosity mai 200 ~ 1200 no ke kūkulu hale a me nā ʻoihana ʻē aʻe, a ʻoi aku ka kiʻekiʻe o ka viscosity o ka papa meaʻai. Aia lākou a pau ma luna o 1000, a ʻaʻole like ka viscosity o nā ʻoihana like ʻole.
No ka nui o kona hoʻohana.
Hoʻopili ʻia ka viscosity o ka sodium carboxymethyl cellulose e kona molecular mass, ka ʻike, ka mahana a me ka waiwai pH, a ua hui pū ʻia me ka ethyl a i ʻole carboxypropyl cellulose, gelatin, xanthan gum, carrageenan, ʻūhini pīni gum, guar gum, agar, sodium alginate, ʻO ka pectin, ka gum arabic a me ka starch a me nā mea i loaʻa iā ia ke kūpono maikaʻi (ʻo ia ka hopena synergistic).
Ke 7 ka pH waiwai, ʻo ka viscosity o ka sodium carboxymethyl cellulose solution ka mea kiʻekiʻe loa, a i ka wā o ka pH 4 ~ 11, ua paʻa. ʻO Carboxymethylcellulose ma ke ʻano o ka metala alkali a me nā paʻakai ammonium hiki ke hoʻoheheʻe ʻia i ka wai. Hiki i nā ion metala divalent Ca2+, Mg2+, Fe2+ ke hoʻopilikia i kona viscosity. Hiki i nā metala koʻikoʻi e like me ke kālā, barium, chromium a i ʻole Fe3+ ke hoʻoheheʻe i waho o ka hopena. Inā mālama ʻia ka ʻike o nā ion, e like me ka hoʻohui ʻana o ka chelating agent citric acid, hiki ke hoʻokumu ʻia kahi hopena ʻoi aku ka viscous, e hopena i kahi ʻōpala palupalu a paʻakikī paha.
ʻO ka sodium carboxymethyl cellulose kahi ʻano o ka cellulose kūlohelohe, ka mea maʻamau i hana ʻia me ka pulupulu linter a i ʻole ka pulp lāʻau ma ke ʻano he kumu kumu a kau ʻia i ka hopena etherification me ka waikawa monochloroacetic ma lalo o nā kūlana alkaline.
E like me nā kikoʻī o nā mea maka a me ka hoʻololi ʻana o ka hydroxyl hydrogen i ka cellulose D-glucose unit e ka hui carboxymethyl, loaʻa nā pūhui polymer wai-soluble me nā pae like ʻole o ka hoʻololi ʻana a me nā puʻupuʻu kaumaha molecular like ʻole.
No ka mea he nui nā hiʻohiʻona kūʻokoʻa a maikaʻi loa ka sodium carboxymethyl cellulose, hoʻohana nui ʻia ia i kēlā me kēia lā ʻoihana kemika, meaʻai a me nā lāʻau lapaʻau a me nā hana ʻoihana ʻē aʻe.
ʻO kekahi o nā hōʻailona koʻikoʻi o ka sodium carboxymethyl cellulose ka viscosity o ka sodium carboxymethyl cellulose. ʻO ka waiwai o ka viscosity e pili ana i nā mea like ʻole e like me ka neʻe ʻana, ka mahana a me ka helu shear. Eia nō naʻe, ʻo nā mea e like me ka neʻe ʻana, ka mahana a me ka shear rate nā mea o waho e pili ana i ka viscosity o ka sodium carboxymethyl cellulose.
ʻO kona kaumaha molecular a me ka hāʻawi ʻana i ka molekala nā mea i loko e pili ana i ka viscosity o ka solution sodium carboxymethyl cellulose. No ka mana hana a me ka hoʻomohala ʻana i ka huahana o ka sodium carboxymethyl cellulose, ʻo ka noiʻi ʻana i kona kaumaha molecular a me ka hāʻawi ʻana i ke kaumaha molecular he mea koʻikoʻi koʻikoʻi koʻikoʻi, ʻoiai ʻo viscosity Hiki i ke ana ke pāʻani i kekahi kuleana kuhikuhi.
ʻO nā kānāwai o Newton i ka rheology, e ʻoluʻolu e heluhelu i ka ʻike pili o ka "rheology" ma ke kemika kino, paʻakikī ke wehewehe i hoʻokahi a ʻelua paha mau ʻōlelo. Inā pono ʻoe e ʻōlelo: no ka hoʻoheheʻe dilute o cmc kokoke i kahi wai Newtonian, ua like ke koʻikoʻi shear i ka helu ʻoki ʻoki, a ua kapa ʻia ka coefficient kūlike ma waena o lākou ka coefficient viscosity a i ʻole kinematic viscosity.
Loaʻa ka viscosity mai nā pūʻali ma waena o nā kaulahao molekula cellulose, me nā ikaika dispersion a me nā paʻa hydrogen. ʻO ka mea nui, ʻo ka polymerization o nā derivatives cellulose ʻaʻole ia he laina laina akā he ʻano lālā multi-branched. I loko o ka hopena, hui pū ʻia nā cellulose multi-branched e hana i kahi hoʻolālā pūnaewele spatial. ʻOi aku ka paʻa o ka hale, ʻoi aku ka nui o nā ikaika ma waena o nā kaulahao molekala i ka hopena hopena.
No ka hoʻoulu ʻana i ke kahe i loko o kahi hopena dilute o nā derivatives cellulose, pono e lanakila ka ikaika ma waena o nā kaulahao mole, no laila, ʻo ka hopena me kahi kiʻekiʻe o ka polymerization e pono ai ka ikaika nui e hoʻohua i ke kahe. No ke ana viscosity, ʻo ka ikaika ma ka hoʻonā CMC he gravity. Ma lalo o ke kūlana o ka'umekaumaha mau, he ikaika nui ke kaulahao o ka solution CMC me ka nui o ka polymerization, a ua lohi ke kahe. Hōʻike ka holo mālie i ka viscosity.
ʻO ka viscosity o ka sodium carboxymethyl cellulose e pili nui ana i ke kaumaha molekala, a ʻaʻohe mea liʻiliʻi i ka degere o ka hoʻololi. ʻOi aku ka nui o ke degere o ka hoʻololi ʻana, ʻoi aku ka nui o ke kaumaha molekala, no ka mea, ʻoi aku ka nui o ke kaumaha o ka hui carboxymethyl i pani ʻia ma mua o ka hui hydroxyl mua.
ʻO ka paʻakai sodium o cellulose carboxymethyl ether, he anionic cellulose ether, he keʻokeʻo a i ʻole ka waiū keʻokeʻo fibrous pauka a i ʻole granule, me ka nui o 0.5-0.7 g/cm3, aneane ʻaʻole ʻono, ʻono ʻole, a me ka hygroscopic. He mea maʻalahi ka hoʻopuehu ʻana i loko o ka wai e hana i kahi hopena colloidal akaka, a ʻaʻole hiki ke hoʻoheheʻe ʻia i loko o nā mea hoʻoheheʻe kūlohelohe e like me ka ethanol. ʻO ka pH o ka hoʻonā wai wai he 6.5 a 8.5. I ka pH>10 a i ʻole <5, hoʻemi nui ʻia ka viscosity o ka sodium carboxymethylcellulose, a ʻoi aku ka maikaʻi o ka hana inā pH=7.
He paʻa wela. Piʻi wikiwiki ka viscosity ma lalo o 20 ℃, a loli mālie ma 45 ℃. ʻO ka hoʻomehana lōʻihi ma luna o 80 ℃ 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 maopopo ka hopena; He paʻa loa ia i ka hopena alkaline, a he maʻalahi ke hydrolyze i mua o ka waika. Ke 2-3 ka waiwai pH, e hoʻoheheʻe ʻia.
Ka manawa hoʻouna: Nov-07-2022