ʻO ka CMC ka mea maʻamau he pūhui polimer anionic i hoʻomākaukau ʻia e ka hana ʻana i ka cellulose kūlohelohe me ka alkali caustic a me ka waika monochloroacetic, me ke kaumaha molekala o 6400 (± 1 000). ʻO nā huahana nui ka sodium chloride a me ka sodium glycolate. No ka CMC ka hoʻololi cellulose maoli. Ua kapa ʻia ʻo ia he "cellulose hoʻololi ʻia" e ka Food and Agriculture Organization o ka United Nations (FAO) a me ka World Health Organization (WHO).
maikaʻi
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 ka hoʻololi ʻana, ʻoi aku ka maikaʻi 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 hōʻoiaʻiʻo ai i kona maikaʻi, i ka hoʻohui ʻana i ke koho o ka etherifying agent, pono e noʻonoʻo ʻia kekahi mau mea e pili ana i ke kiʻekiʻe o ka hoʻololi ʻana a me ka maʻemaʻe, e like me ka pilina pili ma waena o ka alkali a me ka etherifying agent, ka manawa etherification, ka wai wai ʻōnaehana, ka mahana. , ka waiwai pH, ka hoʻonā ʻana a me ka paʻakai.
Ka nānā ʻana i nā pono a me nā hemahema o ka sodium carboxymethyl cellulose
ʻO ka hoʻomohala ʻana o ka sodium carboxymethyl cellulose ʻaʻole i ʻike mua ʻia. ʻOi aku i nā makahiki i hala iho nei, ʻo ka hoʻonui ʻana i nā kahua noi a me ka hōʻemi ʻana i nā kumukūʻai hana i hana ʻia ai ka hana ʻana o carboxymethyl cellulose a kaulana loa. Hoʻohui ʻia nā huahana ma ke kūʻai aku.
A laila, pehea e hoʻoholo ai i ka maikaʻi o ka sodium carboxymethyl cellulose, kā mākou loiloi mai kekahi mau hiʻohiʻona kino a me nā kemika:
ʻO ka mea mua, hiki ke hoʻokaʻawale ʻia mai kona mahana carbonization. ʻO ka mahana carbonization maʻamau o ka sodium carboxymethyl cellulose he 280-300 ° C. I ka wā e carbonized ma mua o ka hiki ʻana o kēia mahana, a laila pilikia kēia huahana. (Hoʻohana ka carbonization i ka umu muffle)
ʻO ka lua, ua ʻokoʻa ʻia e kona wela discoloration. ʻO ka maʻamau, e hoʻololi ke kala o ka sodium carboxymethyl cellulose ke hiki i kahi mahana. ʻO 190-200 °C ka pae wela.
ʻO ke kolu, hiki ke ʻike ʻia mai kona helehelena. ʻO ka hiʻohiʻona o ka hapa nui o nā huahana he pauka keʻokeʻo, a ʻo ka nui o kona nui he 100 mesh, a ʻo 98.5%.
ʻO ka sodium carboxymethyl cellulose kahi huahana cellulose i hoʻohana nui ʻia a loaʻa kahi ākea o nā noi, no laila aia kekahi mau hoʻohālike ma ka mākeke. No laila pehea e ʻike ai inā he huahana ia e koi ʻia e nā mea hoʻohana hiki ke hele i ka hōʻike ʻike aʻe.
E koho i 0.5g o ka sodium carboxymethyl cellulose, ʻaʻole maopopo inā he huahana ia o ka sodium carboxymethylcellulose, e hoʻoheheʻe iā ia i 50mL o ka wai a hoʻoulu, e hoʻohui i kahi liʻiliʻi i kēlā me kēia manawa, e hoʻoulu i 60 ~ 70 ℃, a me ka wela no 20 mau minuke. hana i ka hoʻonā like ʻole, ʻoluʻolu Ma hope o ka ʻike ʻana i ka wai, ua hoʻokō ʻia nā hoʻokolohua aʻe.
1. E hoʻohui i ka wai i ka hoʻonā hoʻāʻo e hoʻoheheʻe i 5 mau manawa, e hoʻohui i ka 0.5mL o ka hopena hoʻāʻo chromotropic acid i 1 kulu o ia mea, a wela i loko o ka wai ʻauʻau no 10 mau minuke e ʻike ʻia ka ʻulaʻula-ʻulaʻula.
2. E hoʻohui i 10 mL o ka acetone i ka 5 mL o ka hoʻonā hoʻāʻo, e lulu a hui maikaʻi ʻia e hana i kahi kahe keʻokeʻo keʻokeʻo.
3. E hoʻohui i 1mL o ketone sulfate solution test i ka 5mL o ka hoʻonā hoʻāʻo, hui a hoʻoluliluli i mea e hoʻohua ai i ka nalu ʻulaʻula uliuli.
4. ʻO ke koena i loaʻa ma ka lehu o kēia huahana e hōʻike ana i ka hopena maʻamau o ka paʻakai sodium, ʻo ia hoʻi, ka sodium carboxymethyl cellulose.
Ma o kēia mau ʻanuʻu, hiki iā ʻoe ke ʻike inā he sodium carboxymethyl cellulose ka huahana i kūʻai ʻia a me kona maʻemaʻe, e hāʻawi ana i kahi ala maʻalahi a maʻalahi no nā mea hoʻohana e koho pololei i nā huahana.
Ka manawa hoʻouna: Nov-12-2022