Etera Cellulose

Etera cellulosei hangaia mai i te cellulose mā te tauhohenga etherification o tētahi, ētahi rānei o ngā kaihoko etherification me te huri maroke. E ai ki ngā hanganga matū rerekē o ngā whakakapinga ether, ka taea te wehewehe i ngā ether cellulose ki ngā ether anionic, cationic me te nonionic. Ko ngā ether cellulose ionic te nuinga o te wāte etera carboxymethyl cellulose (CMC); ko ngā etera cellulose kore-ionic te nuinga kei rotote metiloselulosa etera (MC),te hydroxypropyl methyl cellulose ether (HPMC)me te hydroxyethyl cellulose ether.Te hauota etera (HC)me ērā atu anō. Ka wehea ngā etera kore-ionic ki ngā etera wairewa-wai me ngā etera wairewa-hinu, ā, ko ngā etera wairewa-wai kore-ionic te nuinga o te wā e whakamahia ana i roto i ngā hua moata. I te aroaro o ngā iona konupūmā, he kore pumau te etera cellulose ionic, nō reira he onge te whakamahinga i roto i ngā hua moata maroke-ranu e whakamahi ana i te sima, te raima kua whakamaroketia, me ētahi atu hei rauemi sima. He whānuitia te whakamahinga o ngā etera cellulose wairewa-wai kore-ionic i roto i te umanga rauemi hanga nā te mea he pumau te whakatārewatanga me te pupuri wai.

Ngā Āhuatanga Matū o te Cellulose Ether

Kei ia cellulose ether te hanganga taketake o te cellulose — he hanganga anhydroglucose. I roto i te tukanga whakaputa cellulose ether, ka whakamahanahia tuatahitia te muka cellulose i roto i te otinga kawakore, kātahi ka rongoatia ki te kaihoko etherifying. Ka purea te hua tauhohenga muka, ka kuruhia kia hanga he paura ōrite me te matotoru.

I roto i te tukanga whakaputa o te MC, ko te methyl chloride anake e whakamahia ana hei kaihoko etherification; i tua atu i te methyl chloride, ka whakamahia hoki te propylene oxide hei whiwhi i ngā rōpū whakakapinga hydroxypropyl i roto i te whakaputanga o te HPMC. He rerekē ngā ōwehenga whakakapinga methyl me hydroxypropyl o ngā cellulose ethers, e pā ana ki te hototahitanga waro me te pāmahana gelation wera o ngā otinga cellulose ether.