Sodium carboxymethyl cellulose (CMC), tun mo bi carboxymethyl cellulose. O jẹ ether cellulose ti o ga-polymer ti a pese silẹ nipasẹ kemikali ti o yipada cellulose adayeba, ati pe eto rẹ jẹ pataki ti awọn ẹya D-glucose ti o ni asopọ nipasẹ awọn asopọ β_(14) glycosidic.
CMC jẹ funfun tabi wara funfun fibrous lulú tabi granules pẹlu iwuwo ti 0.5g/cm3, ti o fẹrẹ jẹ adun, odorless ati hygroscopic.
Carboxymethyl cellulose jẹ rọrun lati tuka, ṣe agbekalẹ ojuutu colloidal ti o han gbangba ninu omi, ati pe ko ṣee ṣe ninu awọn olomi Organic gẹgẹbi ethanol.
Nigbati pH>10, iye pH ti 1% ojutu olomi jẹ 6.5≤8.5.
Idahun akọkọ jẹ bi atẹle: cellulose adayeba jẹ alkalized akọkọ pẹlu NaOH, lẹhinna chloroacetic acid ti wa ni afikun, ati hydrogen lori ẹgbẹ hydroxyl lori ẹyọ glukosi ṣe atunṣe pẹlu ẹgbẹ carboxymethyl ninu chloroacetic acid.
O le rii lati inu eto pe awọn ẹgbẹ hydroxyl mẹta wa lori ẹyọ glukosi kọọkan, eyun C2, C3 ati awọn ẹgbẹ C6 hydroxyl, ati iwọn aropo ti hydrogen lori ẹgbẹ hydroxyl ti ẹyọ glukosi jẹ aṣoju nipasẹ awọn ami ti ara ati kemikali.
Ti awọn hydrogens lori awọn ẹgbẹ hydroxyl mẹta lori ẹyọkan kọọkan ni rọpo nipasẹ awọn ẹgbẹ carboxymethyl, lẹhinna iwọn ti aropo jẹ asọye bi 7-8, pẹlu iwọn ti o pọju ti aropo ti 1.0 (iwọn ounjẹ le ṣaṣeyọri alefa yii nikan). Iwọn iyipada ti CMC taara ni ipa lori solubility, emulsification, thickening, iduroṣinṣin, acid resistance ati iyọ resistance ti CMC.
Nigba lilo awọn ọja CMC, o yẹ ki a loye ni kikun awọn ipilẹ atọka akọkọ, gẹgẹbi iduroṣinṣin, iki, resistance acid, viscosity, bbl
Nitoribẹẹ, awọn ohun elo oriṣiriṣi lo oriṣiriṣi carboxymethyl cellulose, nitori ọpọlọpọ awọn oriṣi ti viscosity ti n ṣiṣẹ lori cellulose carboxymethyl, ati awọn itọkasi ti ara ati kemikali tun yatọ. Mọ awọn wọnyi, o le mọ bi o ṣe le yan ọja to tọ.
Akoko ifiweranṣẹ: Oṣu kọkanla-07-2022