Ether Cellulosehe mea hanga mai i te cellulose na roto i te tauhohenga whakaetere o te kotahi, e maha atu ranei nga apiha whakaene me te huri maroke. E ai ki nga hanganga matū rereke o nga whakakapi ether, ka taea te wehea nga ethers cellulose ki nga ethers anionic, cationic me te nonionic. Ko nga etera cellulose katote te nuinga kei rotocarboxymethyl cellulose ether (CMC); ko nga etera cellulose kore-katote te nuinga kei rotomethyl cellulose ether (MC),hydroxypropyl methyl cellulose ether (HPMC)me te hydroxyethyl cellulose ether.chlorine ether (HC)me etahi atu. Ko nga ethers kore-ionic e wehewehea ana ki te wai-wairewa ethers me te hinu-wairewa ethers, me te kore-katote wai-wairewa ethers te nuinga whakamahia i roto i nga hua moata. I te aroaro o nga katote konupūmā, karekau te katote cellulose ether, no reira karekau e whakamahia i roto i nga hua moata whakauru maroke e whakamahi ana i te ciment, te kotakota slaked, me etahi atu hei taonga raima. Ko nga etera cellulose wairewa-wai-kore e whakamahia nuitia ana i roto i te umanga hangahanga na te mea he pumau te whakatārewatanga me te pupuri wai.
Nga Ahuatanga matū o te Cellulose Ether
Kei ia cellulose ether te hanganga taketake o te cellulose —Anhydroglucose hanganga. I roto i te tukanga o te whakaputa cellulose ether, ka whakamahana tuatahi te muka cellulose i roto i te wairewa kawakore, katahi ka tukuna ki tetahi kaihoko whakaetere. Ka purea te hua tauhohenga kiko me te parai hei hanga i te paura orite me te tino pai.
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 ano te propylene oxide ki te whiwhi i nga roopu whakakapi hydroxypropyl i roto i te hanga o te HPMC. He rereke te rerekee o te methyl me te hydroxypropyl ethers cellulose, e pa ana ki te hototahi waro me te pāmahana waiariki o nga otinga cellulose ether.
Wā tuku: Apr-25-2024