Iyini i-hydroxyethyl cellulose?

Iyini i-hydroxyethyl cellulose?

I-Hydroxyethyl cellulose (HEC), okuqinile okumhlophe noma okukhanyayo okuphuzi, okungenaphunga, okungenayo ubuthi okune-fibrous noma okufana nempuphu, okulungiselelwe ngokushintsha i-alkaline cellulose kanye ne-ethylene oxide (noma i-chlorohydrin), okungokwamalungu e-Nonionic soluble cellulose ethers. Ngenxa yokuthi i-HEC inezakhiwo ezinhle ezifana nokuqina, ukumiswa, ukuhlakazwa, ukuhlanganiswa, ukubopha, ukwakha ifilimu, ukuvikela umswakama kanye nokunikeza ama-colloid avikelayo, isetshenziswe kabanzi ekuhloleni uwoyela, ukumbozwa, ukwakhiwa, imithi kanye nokudla, izindwangu, ukwenza amaphepha kanye nama-polymer. Ukwenziwa kwe-polymer kanye neminye imikhakha.

I-Hydroxyethyl cellulose isetshenziswa kabanzi embonini yokugqoka. Ake sibheke ukuthi isebenza kanjani ekugqokeni:

Kwenzekani uma i-hydroxyethyl cellulose ihlangana nezingubo ezisekelwe emanzini?

Njenge-surfactant engeyona i-ionic, i-hydroxyethyl cellulose inezakhiwo ezilandelayo ngaphezu kokuqina, ukumiswa, ukubopha, ukuntanta, ukwakha ifilimu, ukuhlakazeka, ukugcinwa kwamanzi kanye nokunikeza ama-colloid avikelayo:

I-HEC iyancibilika emanzini ashisayo noma abandayo, futhi ayishisi uma izinga lokushisa eliphezulu noma libila, okwenza ibe nezici eziningi zokuncibilika kanye nokuthamba, kanye ne-gelling engashisi;

Umthamo wokugcina amanzi uphindwe kabili kune-methyl cellulose, futhi unokulawulwa okungcono kokugeleza kwamanzi;

I-Non-ionic ngokwayo ingahlala ndawonye nezinye izinhlobo eziningi zama-polymer ancibilika emanzini, ama-surfactants, kanye nosawoti, futhi iyi-colloidal thickener enhle kakhulu equkethe izixazululo ze-electrolyte ezigxile kakhulu;

Uma kuqhathaniswa ne-methyl cellulose eyaziwayo kanye ne-hydroxypropyl methyl cellulose, ikhono lokuhlakazeka le-I-HECiyona embi kakhulu, kodwa ikhono lokuvikela i-colloid yilona elinamandla kakhulu.

Njengoba i-hydroxyethyl cellulose elashwe ngaphezulu iyi-powdery noma i-fibrous solid, i-Shandong Heda ikukhumbuza ukuthi unake amaphuzu alandelayo lapho ulungiselela i-hydroxyethyl cellulose mother liquor:

(1) Ngaphambi nangemva kokufaka i-hydroxyethyl cellulose, kumele ihlale ixutshwa kuze kube yilapho ikhambi selicacile futhi licacile ngokuphelele.

(2) Kumelwe ihlungwe kancane kancane emgqonyeni wokuxuba, futhi ungaxhumani ngqo i-hydroxyethyl cellulose kanye ne-hydroxyethyl cellulose emgqonyeni wokuxuba ngobuningi obukhulu noma ngesimo sezigaxa namabhola.

(3) Izinga lokushisa lamanzi kanye nenani le-pH lamanzi linobudlelwano obusobala nokuncibilika kwe-hydroxyethyl cellulose, ngakho-ke kufanele kunakwe ngokukhethekile kulo.

(4) Ungalokothi ufake ezinye izinto ze-alkaline engxubeni ngaphambi kokuba i-hydroxyethyl cellulose powder imanziswe ngamanzi. Ukuphakamisa i-pH kuphela ngemva kokumanzisa kuzosiza ekuncibilikeni.

(5) Kangangokunokwenzeka, engeza i-antifungal agent kusenesikhathi.

(6) Uma usebenzisa i-hydroxyethyl cellulose ene-viscosity ephezulu, ukuhlushwa kotshwala obungumama akufanele kube ngaphezu kuka-2.5-3% (ngesisindo), ngaphandle kwalokho utshwala obungumama kunzima ukubuphatha.