Cellulose Ether

Cellulose etherwaxaa laga sameeyaa cellulose iyada oo loo marayo falgalka etherification ee hal ama dhowr wakiil oo etherification ah iyo shiidid qalalan. Sida laga soo xigtay qaab-dhismeedka kiimikada ee kala duwan ee walxaha ether-ka, ether-ka cellulose waxaa loo qaybin karaa anionic, cationic iyo nonionic ethers. Ether-ka ionic cellulose inta badan waxaa ka mid ahKaarboksimetil cellulose ether (CMC); unugyada aan ionic ahayn ee cellulose ethers waxaa inta badan ka mid ahmethyl cellulose ether (MC),hydroxypropyl methyl cellulose ether (HPMC)iyo hydroxyethyl cellulose ether.Koloriin ether (HC)iyo wixii la mid ah. Ether-yada aan ionic-ka ahayn waxaa loo qaybiyaa ether-yada biyaha ku milma iyo ether-yada saliidda ku milma, ether-yada aan ionic-ka ahayn ee biyaha ku milma waxaa inta badan loo isticmaalaa alaabada hoobiyaha. Marka ay joogaan ion-yada kalsiyum-ka, ether-ka ionic-ka ah ee cellulose waa mid aan degganayn, sidaa darteed si dhif ah ayaa loogu isticmaalaa alaabada hoobiyaha qalalan ee isku dhafan ee isticmaala sibidhka, lime la jarjaray, iwm. sida walxaha sibidhka. Ether-yada cellulose-ka ee aan ionic-ka ahayn ee biyaha ku milma ayaa si weyn loogu isticmaalaa warshadaha qalabka dhismaha sababtoo ah xasilloonidooda joojinta iyo haynta biyaha.

Sifooyinka Kiimikada ee Cellulose Ether

Ether cellulose kasta wuxuu leeyahay qaab-dhismeedka aasaasiga ah ee cellulose - qaab-dhismeedka Anhydroglucose. Inta lagu guda jiro soo saarista ether cellulose, fiber-ka cellulose marka hore waxaa lagu kululeeyaa xal alkaline ah, ka dibna waxaa lagu daaweeyaa wakiil etherifying ah. Badeecada falgalka fibrous-ka waa la nadiifiyaa oo la shiidaa si loo sameeyo budo isku mid ah oo leh qaab gaar ah.

Habka wax soo saarka ee MC, kaliya methyl chloride ayaa loo isticmaalaa sidii wakiil etherification ah; marka lagu daro methyl chloride, propylene oxide ayaa sidoo kale loo isticmaalaa in lagu helo kooxaha hydroxypropyl ee wax soo saarka HPMC. Noocyada kala duwan ee cellulose ethers waxay leeyihiin saamiga beddelka methyl iyo hydroxypropyl oo kala duwan, taas oo saameeya iswaafajinta dabiiciga ah iyo heerkulka jelitaanka kulaylka ee xalalka cellulose ether.