ʻO nā cellulose ethers kahi papa like ʻole o nā pūhui i loaʻa mai ka cellulose, kahi polymer kūlohelohe i loaʻa i nā paia o nā mea kanu. Hoʻohana nui ʻia lākou i nā ʻoihana like ʻole ma muli o ko lākou mau waiwai kūʻokoʻa, me ka solubility i nā ʻano mea hoʻoheheʻe. He mea koʻikoʻi ka hoʻomaopopo ʻana i ke ʻano solubility o cellulose ethers no kā lākou noi i nā lāʻau lapaʻau, meaʻai, kūkulu hale, a me nā ʻāpana ʻē aʻe.
Hoʻopuka pinepine ʻia nā cellulose ethers e ka hoʻololi ʻana i ka cellulose ma o nā hopena etherification. ʻO nā ʻano maʻamau o ka cellulose ethers he methyl cellulose (MC), ethyl cellulose (EC), hydroxyethyl cellulose (HEC), hydroxypropyl cellulose (HPC), a me carboxymethyl cellulose (CMC). Hōʻike kēlā me kēia ʻano i nā hiʻohiʻona solubility ʻokoʻa e pili ana i kona ʻano kemika a me ka pae o ka hoʻololi ʻana.
Hoʻopili ʻia ka solubility o cellulose ethers e nā mea e like me ke degere o ka polymerization, degere o ka hoʻololi ʻana, ke kaumaha molekala, a me ke ʻano o nā pūʻulu substituent. ʻO ka maʻamau, ʻoi aku ka liʻiliʻi o nā cellulose ethers me nā degere haʻahaʻa o ka hoʻololi ʻana a me nā kaumaha molekala kiʻekiʻe ke hoʻohālikelike ʻia me ka poʻe me nā degere kiʻekiʻe o ka hoʻololi ʻana a me nā kaumaha molekala haʻahaʻa.
ʻO kekahi o nā waiwai koʻikoʻi o ka cellulose ethers ʻo ko lākou hiki ke hoʻoheheʻe i nā ʻano mea hoʻoheheʻe like ʻole, me ka wai, nā mea hoʻoheheʻe organik, a me kekahi mau wai polar a me ka polar ʻole. ʻO ka hoʻoheheʻe wai kahi hiʻohiʻona nui o nā cellulose ethers a he mea nui loa ia no nā noi i nā lāʻau lapaʻau, meaʻai, a me nā huahana mālama pilikino.
ʻO nā etera cellulose hiki ke hoʻoheheʻe ʻia i ka wai e like me HEC, HPC, a me CMC e hana i nā ʻoluʻolu maʻemaʻe a paʻakikī ke hoʻopuehu ʻia i ka wai. Hōʻike kēia mau hoʻonā i ka ʻano pseudoplastic, ʻo ia hoʻi ke emi nei ko lākou viscosity ma lalo o ke koʻikoʻi shear, e kūpono ana ia no ka hoʻohana ʻana ma ke ʻano he mānoanoa, stabilizers, a me nā mea hana kiʻiʻoniʻoni i nā meaʻai a me nā lāʻau lapaʻau.
ʻO ka solubility o cellulose ethers i loko o nā mea hoʻoheheʻe organik e pili ana i kā lākou hana kemika a me ka polarity o ka solvent. No ka laʻana, hiki ke hoʻoheheʻe ʻia ʻo MC a me EC i kahi ākea o nā mea hoʻoheheʻe organik, me ka acetone, ethanol, a me ka chloroform, ma muli o ko lākou ʻano haʻahaʻa haʻahaʻa o ka hoʻololi a me ke ʻano hydrophobic. Hoʻolilo kēia mau waiwai iā lākou i mea waiwai i nā noi e like me nā uhi, nā adhesives, a me nā ʻōnaehana hoʻokuʻu lāʻau hoʻokuʻu ʻia.
HEC a me HPC, aia i loko o nā pūʻulu hydroxyethyl a me hydroxypropyl, i kēlā me kēia, hōʻike i ka solubility i hoʻonui ʻia i loko o nā mea hoʻoheheʻe kūlohelohe polar e like me nā alcohols a me nā glycols. Hoʻohana pinepine ʻia kēia mau cellulose ethers e like me nā mānoanoa a me nā mea hoʻololi rheology i nā mea hoʻonaninani a me nā huahana mālama pilikino, a me nā pena wai a me nā uhi.
Hiki ke hoʻoheheʻe ʻia ka CMC i ka wai a me kekahi mau mea hoʻoheheʻe polar ma muli o kāna carboxymethyl substituents, e hāʻawi ana i ka wai-solubility i ke kaulahao polymer. Hoʻohana nui ʻia ʻo ia ma ke ʻano he mea mānoanoa, stabilizer, a me emulsifier i nā huahana meaʻai, lāʻau lapaʻau, a me nā noi ʻoihana.
Hiki ke hoʻopili ʻia ka solubility o cellulose ethers e nā mea o waho e like me ka mahana, ka pH, a me ke alo o nā paʻakai a i ʻole nā mea hoʻohui ʻē aʻe. No ka laʻana, hiki i ka hoʻohui ʻana o nā electrolytes e like me ka sodium chloride a i ʻole calcium chloride ke hōʻemi i ka solubility o ka wai-soluble cellulose ethers ma o ka hoʻoulu ʻana i ka polymer aggregation a i ʻole ka ua.
Hōʻike nā cellulose ethers i nā waiwai solubility maʻalahi e hoʻolilo iā lākou i mea hoʻohui waiwai i nā ʻano ʻoihana. ʻO ko lākou hiki ke hoʻoheheʻe i loko o ka wai, nā mea hoʻoheheʻe organik, a me nā wai polar hiki ke hoʻohana i nā noi like ʻole mai ka hoʻokumu ʻana i nā lāʻau lapaʻau i nā mea hana. He mea nui ka hoʻomaopopo ʻana i ke ʻano solubility o cellulose ethers no ka hoʻonui ʻana i kā lākou hana a me ka hana i nā huahana a me nā kaʻina hana.
Ka manawa hoʻouna: Apr-24-2024