Sodium carboxymethyl cellulose (CMC), oo sidoo kale loo yaqaan karboxymethyl cellulose. Waa eter cellulose-polymer-sare ah oo ay diyaarisay kiimikaad wax ka beddeleysa cellulose dabiiciga ah, qaabdhismeedkeeduna wuxuu inta badan ka kooban yahay unugyada D-glucose ee ku xiran β_(14) glycosidic bonds.
CMC waa budo fibros ah oo cad ama caano leh oo leh cufnaanta 0.5g/cm3, ku dhawaad aan dhadhamin, ur lahayn iyo hygroscopic.
Carboxymethyl cellulose way fududahay in la kala firdhiyo, waxay samaysaa xal kolloidal oo hufan oo biyo ah, waana mid aan lagu milmi karin dareerayaasha organic sida ethanol.
Marka pH>10, pH qiimaha 1% xal aqueous waa 6.5≤8.5.
Dareen-celinta ugu weyni waa sida soo socota: cellulose-ka dabiiciga ah ayaa marka hore alkalized leh NaOH, ka dibna chloroacetic acid ayaa lagu daraa, iyo hydrogen-ka kooxda hydroxyl ee qaybta gulukooska waxay la falgashaa kooxda karboxymethyl ee chloroacetic acid.
Waxaa laga arki karaa qaab-dhismeedka in ay jiraan saddex kooxood oo hydroxyl ah oo ku jira unug kasta oo gulukoos ah, kuwaas oo kala ah C2, C3 iyo C6 kooxaha hydroxyl, iyo heerka beddelka ee hydrogen ee kooxda hydroxyl ee unugga gulukooska waxaa matalaya tilmaamayaasha jirka iyo kiimikada.
Haddii hydrogens-yada saddexda kooxood ee hydroxyl ee cutub kasta lagu beddelo kooxaha carboxymethyl, markaa heerka beddelka waxaa lagu qeexaa sida 7-8, oo leh heerka ugu sarreeya ee beddelka 1.0 (darajada cuntada ayaa kaliya lagu gaari karaa shahaadadan). Darajada beddelka CMC waxay si toos ah u saamaysaa milanka, emulsification, dhumucda, xasiloonida, caabbinta aashitada iyo caabbinta milixda ee CMC.
Marka la isticmaalayo alaabta CMC, waa in aan si buuxda u fahmaan xuduudaha index ugu muhiimsan, sida xasiloonida, viscosity, caabbinta acid, viscosity, iwm.
Dabcan, codsiyada kala duwan waxay isticmaalaan cellulose carboxymethyl kala duwan, sababtoo ah waxaa jira noocyo badan oo viscosity dhaqma on cellulose carboxymethyl, iyo tilmaamayaasha jirka iyo kiimikaad sidoo kale waa kala duwan yihiin. Ogaanshaha kuwan, waxaad garan kartaa sida loo doorto badeecada saxda ah.
Waqtiga boostada: Nov-07-2022