Iyini i-hydroxyethyl cellulose?

Iyini i-hydroxyethyl cellulose?

I-Hydroxyethyl cellulose (HEC), okuqinile okuphuzi okumhlophe noma okuphaphathekile, okunganuki, okungewona ubuthi noma okuyimpuphu, okulungiselelwe ukufakwa kwe-etherification ye-alkaline cellulose ne-ethylene oxide (noma i-chlorohydrin), okuyingxenye yohlobo lwe-Nonionic soluble cellulose ethers. Ngenxa yokuthi i-HEC inezakhiwo ezinhle ezifana nokuqina, ukumisa, ukuhlakazeka, i-emulsifying, ukubopha, ukwenza ifilimu, ukuvikela umswakama nokuhlinzeka ngama-colloid okuzivikela, isetshenziswe kabanzi ekuhloleni amafutha, ukugqoka, ukwakhiwa, imithi nokudla, izindwangu, ukwenza amaphepha kanye nama-polymers. I-polymerization nezinye izinkambu.

I-Hydroxyethyl cellulose isetshenziswa kabanzi embonini yokumboza. Ake sibheke ukuthi isebenza kanjani kuma-coatings:

Kwenzekani lapho i-hydroxyethyl cellulose ihlangana nezingubo ezisekelwe emanzini?

Njenge-surfactant engeyona i-ionic, i-hydroxyethyl cellulose inalezi zakhiwo ezilandelayo ngaphezu kokujiya, ukumisa okwesikhashana, ukubopha, ukuntanta, ukwenza ifilimu, ukuhlakazwa, ukugcinwa kwamanzi nokuhlinzeka ngama-colloid avikelayo:

I-HEC iyancibilika emanzini ashisayo noma abandayo, futhi ayidli ekushiseni okuphezulu noma ekubiliseni, okwenza ibe nezici eziningi zokuncibilika kanye nezici ze-viscosity, kanye ne-gelling engashisi;

Umthamo wokugcina amanzi uphindwe kabili kune-methyl cellulose, futhi unokulawula ukugeleza okungcono;

I-non-ionic ngokwayo ingahlala nohlu olubanzi lwama-polymers ancibilikayo emanzini, ama-surfactants, nosawoti, futhi iyi-colloidal thickener enhle kakhulu equkethe izixazululo ze-electrolyte eziphezulu zokugxila;

Uma kuqhathaniswa ne-methyl cellulose eyaziwayo kanye ne-hydroxypropyl methyl cellulose, ikhono lokuhlakazaI-HECyimbi kakhulu, kodwa ikhono le-colloid elivikelayo linamandla kakhulu.

Njengoba i-hydroxyethyl cellulose efakwe phezulu iyimpuphu noma i-fibrous solid, u-Shandong Heda ukukhumbuza ukuthi unake amaphuzu alandelayo lapho ulungiselela ugologo kamama we-hydroxyethyl cellulose:

(1) Ngaphambi nangemuva kokwengeza i-hydroxyethyl cellulose, kufanele igcinwe inyakaza kuze kube yilapho isixazululo sesobala ngokuphelele futhi sicacile.

(2) Kumelwe ihlungwe kancane kancane emgqonyeni wokuxuba, futhi ungaxhumi ngokuqondile i-hydroxyethyl cellulose ne-hydroxyethyl cellulose emgqonyeni wokuxuba ngobuningi noma ngesimo sezigaxa namabhola.

(3) Izinga lokushisa lamanzi kanye nenani le-pH lamanzi kunobudlelwane obusobala nokuqedwa kwe-hydroxyethyl cellulose, ngakho kufanele kuqashelwe ngokukhethekile.

(4) Ungalokothi wengeze izinto ezine-alkali engxubeni ngaphambi kokuba i-hydroxyethyl cellulose powder icwiliswe ngamanzi. Ukwenyusa i-pH kuphela ngemuva kokumanzisa kuzosiza ekuncibilikeni.

(5) Ngokusemandleni akho, engeza i-ejenti ye-antifungal kusengaphambili.

(6) Uma usebenzisa i-high-viscosity hydroxyethyl cellulose, ukugcwala kotshwala kamama akufanele kube ngaphezu kuka-2.5-3% (ngesisindo), ngaphandle kwalokho utshwala bukamama kunzima ukubuphatha.


Isikhathi sokuthumela: Apr-26-2024