Cellulose etherA na-eme ya site na cellulose site na mmeghachi omume etherification nke otu ma ọ bụ ọtụtụ ihe na-eme ka etherification na igwe nkụ. Dịka usoro kemịkalụ dị iche iche nke ihe ndị na-anọchi ether si dị, enwere ike kewaa cellulose ethers n'ime anionic, cationic na nonionic ethers. Ionic cellulose ethers gụnyere karịsịacarboxymethyl cellulose ether (CMC)ihe ndị na-abụghị ionic cellulose ethers gụnyeremethyl cellulose ether (MC),hydroxypropyl methyl cellulose ether (HPMC)na hydroxyethyl cellulose ether.Chlorine ether (HC)na ihe ndị ọzọ. A na-ekewa ether ndị na-abụghị ionic n'ime ether ndị na-agbaze mmiri na ether ndị na-agbaze mmanụ, a na-ejikwa ether ndị na-agbaze mmiri na-abụghị ionic eme ihe n'ime ngwaahịa moto. N'ebe calcium dị, ether ionic cellulose adịghị akwụsi ike, yabụ a naghị eji ya eme ihe na ngwaahịa moto akọrọ nke na-eji simenti, lime a slaked, wdg. dị ka ihe eji eme simenti. A na-ejikarị ether cellulose ndị na-agbaze mmiri na-abụghị ionic eme ihe n'ụlọ ọrụ ihe owuwu n'ihi nkwụsi ike ha na njigide mmiri.
Njirimara Kemịkal nke Cellulose Ether
Ether cellulose ọ bụla nwere usoro bụ isi nke cellulose — usoro Anhydroglucose. N'ime usoro imepụta cellulose ether, a na-ebu ụzọ kpoo eriri cellulose ahụ ọkụ na mmiri alkaline, wee jiri ihe na-eme ka ọ dị ọkụ gwọọ ya. A na-asacha ma gwakọta ngwaahịa mmeghachi omume fibrous ahụ ka ọ bụrụ ntụ ntụ otu nke nwere obere ntụpọ.
N'usoro mmepụta nke MC, naanị methyl chloride ka a na-eji dị ka ihe na-eme ka etherification dị; na mgbakwunye na methyl chloride, a na-ejikwa propylene oxide iji nweta otu hydroxypropyl substituent na mmepụta nke HPMC. Ọtụtụ cellulose ethers nwere oke mgbanwe methyl na hydroxypropyl dị iche iche, nke na-emetụta ndakọrịta organic na okpomọkụ gelation okpomọkụ nke cellulose ether solutions.
Oge ozi: Eprel-25-2024