Iyini iHydroxyethyl Cellulose?
IHydroxyethyl cellulose (HEC), okuphuzi okumhlophe noma okukhanyayo, okunganuki, okuqinile okunganabuthi noma okuyimpuphu, okulungiselelwe ukusabela kwe-etherification ye-alkaline cellulose ne-ethylene oxide (noma i-chlorohydrin), ingeka-Nonionic soluble cellulose ethers.Njengoba i-HEC inezakhiwo ezinhle zokuqina, ukumisa, ukuhlakazeka, ukuhlanganisa, ukubopha, ukwenza ifilimu, ukuvikela umswakama nokuhlinzeka nge-colloid evikelayo, iye yasetshenziswa kabanzi ekuhloleni amafutha, ukugqoka, ukwakhiwa, imithi, ukudla, izindwangu, ukwenza iphepha kanye ne-polymerization. nezinye izinkambu.
I-Hydroxyethyl cellulose isetshenziswa kabanzi embonini yokumboza, ake sibheke ukuthi isebenza kanjani ekuhlanganiseni:
Kwenzekani lapho i-hydroxyethyl cellulose ihlangana nopende osuselwe emanzini?
Njenge-surfactant engeyona i-ionic, i-hydroxyethyl cellulose inalezi zakhiwo ezilandelayo ngaphezu kokuqina, ukumisa okwesikhashana, ukubopha, ukuntanta, ukwenza ifilimu, ukuhlakazeka, ukugcinwa kwamanzi kanye nokuhlinzeka nge-colloid evikelayo:
I-HEC inyibilika emanzini ashisayo noma emanzini abandayo, izinga lokushisa eliphezulu noma abilayo ngaphandle kwemvula, ukuze ibe nohlu olubanzi lwezimpawu ze-solubility kanye ne-viscosity, kanye ne-gelation engashisi;
Umthamo wokugcina amanzi uphindwe kabili kune-methyl cellulose, futhi unokulawula ukugeleza okungcono;
Ayiyona i-ionic futhi ingahlala nohlu olubanzi lwama-polymers ancibilika emanzini, ama-surfactants, nosawoti.Kuyinto enhle kakhulu ye-colloidal thickener yezixazululo eziphezulu ze-electrolyte;
Uma kuqhathaniswa ne-methyl cellulose eyaziwayo kanye ne-hydroxypropyl methyl cellulose, ikhono lokuhlakaza le-HEC libi kakhulu, kodwa ikhono le-colloid lokuvikela liqine kakhulu.
Njengoba i-hydroxyethyl cellulose efakwe phezulu iyimpuphu noma i-fibrous solid, amaphuzu alandelayo kufanele alandelwe lapho kulungiswa utshwala bomama be-hydroxyethyl cellulose:
(1) Ngaphambi nangemva kokwengeza i-hydroxyethyl cellulose, kufanele inyakaziswe ngokuqhubekayo kuze kube yilapho isixazululo sisobala ngokuphelele futhi sicacile.
(2) Kumelwe ihlungwe kancane kancane ethangini lokuxuba, futhi ingafaki inani elikhulu noma ifake ngokuqondile i-hydroxyethyl cellulose ethangini lokuxuba.
(3) Izinga lokushisa lamanzi kanye nenani le-PH emanzini linobudlelwano obubalulekile nokuqedwa kwe-hydroxyethyl cellulose, ngakho-ke kufanele kuqashelwe ngokukhethekile.
(4) Ungangezi ezinye izinto ezine-alkali engxubeni ngaphambi kokuba i-hydroxyethyl cellulose powder icwiliswe ngamanzi.Ukuphakamisa i-pH ngemva kokumanzisa kusiza ukuncibilika.
(5) Ngokusemandleni akho, engeza i-ejenti ye-antifungal kusengaphambili.
(6) Uma usebenzisa i-high-viscosity hydroxyethyl cellulose, ukugcwala kotshwala kamama akumele kube ngaphezu kuka-2.5-3% (ngesisindo), ngaphandle kwalokho utshwala bukamama buyoba nzima ukubuphatha.
Isikhathi sokuthumela: Nov-21-2022