Eter cellulose waa polymer synthetic oo laga sameeyay cellulose dabiiciga ah iyada oo loo marayo isbeddel kiimiko ah. Cellulose ether waa nooc ka mid ah cellulose dabiiciga ah. Wax soo saarka ether-ka cellulose wuu ka duwan yahay polymers-ka synthetic. Maaddada ugu badan ee aasaasiga ah waa cellulose, oo ah ka samaysan polymer dabiici ah. Sababtoo ah gaar ahaan qaab dhismeedka cellulose ee dabiiciga ah, cellulose lafteedu awood uma laha inay ka falceliyaan wakiilada etherification. Si kastaba ha ahaatee, ka dib daaweynta wakiilka bararka, bonds hydrogen xooggan u dhexeeya silsiladaha molecular iyo silsiladaha waa la burburiyaa, iyo sii daynta firfircoon ee kooxda hydroxyl waxay noqotaa cellulose alkali fal-celin ah. Hel ether cellulose.
Astaamaha ether-yada cellulose waxay ku xiran yihiin nooca, tirada iyo qaybinta beddelka. Kala soocida ether-ka cellulose sidoo kale waxaa loo kala saaraa iyadoo loo eegayo nooca beddelka, heerka etherification, milanka iyo sifooyinka codsiga ee la xidhiidha. Marka loo eego nooca beddelka ee silsiladda molecular, waxaa loo qaybin karaa monoether iyo ether isku dhafan. MC-ka aan inta badan isticmaalno waa monoether, HPMC-guna waa eter isku dhafan. Methyl cellulose ether MC waa badeecada ka dib markii kooxda hydroxyl ee unugga gulukooska ee cellulose dabiiciga ah lagu beddelay methoxy. Waa shey la helay iyadoo lagu beddelayo qayb ka mid ah kooxda hydroxyl ee unugga koox methoxy ah iyo qayb kale oo leh koox hydroxypropyl ah. Qaabka qaabdhismeedku waa [C6H7O2(OH)3-mn(OCH3)m[OCH2CH(OH)CH3]n]x Hydroxyethyl methyl cellulose ether HEMC, kuwani waa noocyada ugu waaweyn ee si wayn loo isticmaalo loogana iibiyo suuqa.
Marka la eego milanka, waxa loo qaybin karaa ionic iyo non-ionic. Ether-yada cellulose-ka aan-ionic-ka ee biyaha-milmi kara waxay inta badan ka kooban yihiin laba taxane oo ethers alkyl ah iyo ethers hydroxyalkyl. Ionic CMC waxaa inta badan loo isticmaalaa saabuunta synthetic, daabacaadda dunta iyo midabaynta, sahaminta cuntada iyo saliidda. Non-ionic MC, HPMC, HEMC, iwm ayaa inta badan loo isticmaalaa qalabka dhismaha, daahan cinjirka, daawada, kiimikooyinka maalinlaha ah, iwm. Waxa loo isticmaalaa dhumuc weyn, wakiilka biyaha celiya, xasilinta, kala firdhiso iyo wakiilka samaynta filimada.
Aqoonsiga tayada etherka cellulose:
Saamaynta maadada methoxyl ee tayada: haynta biyaha iyo shaqada dhumucda
Saamaynta tayada ee hydroxyethoxyl/hydroxypropoxyl: hadba inta ka kooban maacuunta, ayaa sii wanagsan sii haynta biyaha.
Saamaynta tayada viscosity: heerka sare ee polymerization, waa ka sarreeyaa viscosity iyo si fiican u haynta biyaha.
Saamaynta tayada ganaaxa: sida ugu fiican ee kala firidhsan iyo kala dirida hoobiye, si dhakhso ah oo dheeraad ah u labis ah, iyo ilaalinta qaraabo ah ayaa ka wanaagsan.
Saamaynta tayada ee gudbinta iftiinka: heerka sare ee polymerization, ayaa ka sii badan heerka lebiska, iyo wasakhda yar
Saamaynta tayada heerkulka jel: heerkulka jel ee dhismuhu waa ku dhawaad 75 ° C
Saamaynta tayada biyaha: <5%, ether cellulose way fududahay in la nuugo qoyaanka, markaa waa in la xidho oo la kaydiyaa.
Saamaynta tayada dambaska: <3%, inta dambaska sareeyo, waa wasakh badan
Saamaynta tayada qiimaha PH: u dhow dhexdhexaad, ether cellulose waxay leedahay waxqabad xasilloon oo u dhexeeya PH: 2-11
Waqtiga boostada: Febraayo-14-2023