Focus on Cellulose ethers

Izakhiwo ze-Hydroxyethyl cellulose kanye nezinyathelo zokuphepha

IHydroxyethyl cellulose (HEC) iyi-fibrous emhlophe noma ekhanyayo, engenaphunga, eqinile engenabuthi noma eyimpuphu elungiswe ngokufakwa kwe-alkaline cellulose ne-ethylene oxide (noma i-chlorohydrin). I-Nonionic soluble cellulose ethers. Ngaphezu kokuqina, ukumisa, ukubopha, ukuntanta, ukwenza ifilimu, ukusabalalisa, ukugcina amanzi kanye nokuhlinzeka ngama-colloid avikelayo, inalezi zinto ezilandelayo:

1. I-HEC iyancibilika emanzini ashisayo noma abandayo, futhi ayidli ngokushisa okuphezulu noma ukubila, ukuze ibe nezici eziningi zokuncibilika kanye nezici ze-viscosity, kanye ne-gelation engashisi;

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

3. Umthamo wokugcina amanzi uphakeme ngokuphindwe kabili kunalowo we-methyl cellulose, futhi unokulawula ukugeleza okungcono.

4. Uma kuqhathaniswa ne-methyl cellulose eyaziwayo kanye ne-hydroxypropyl methyl cellulose, ikhono lokuhlakaza le-HEC libi kakhulu, kodwa i-colloid evikelayo inekhono eliqine kakhulu. Ngenxa yokuthi i-HEC inezakhiwo ezinhle zokuqina, ukumisa, ukuhlakaza, ukuhlanganisa, ukubopha, ukwenza ifilimu, ukuvikela umswakama nokuhlinzeka nge-colloid evikelayo, iye yasetshenziswa kabanzi ekuhloleni amafutha, ukumboza, ukwakhiwa, imithi nokudla, indwangu, iphepha kanye ne-polymerization. nezinye izinkambu.

Izinyathelo zokuzivikela:

Njengoba i-hydroxyethyl cellulose ehlanjululwe phezulu iyimpushana noma i-cellulose eqinile, kulula ukuyiphatha futhi incibilike emanzini inqobo nje uma lezi zindaba ezilandelayo ziphawulwa.

1. Ngaphambi nangemva kokwengeza i-hydroxyethyl cellulose, kufanele inyakaziswe ngokuqhubekayo kuze kube yilapho isisombululo sisobala ngokuphelele futhi sicacile.

2. Kumele ihlungwe emgqonyeni wokuxuba kancane kancane, futhi ungafaki ngokuqondile i-cellulose ye-hydroxyethyl eyakheke yaba izigaxa namabhola emgqonyeni wokuxuba.

3. Izinga lokushisa lamanzi kanye nenani le-pH lamanzi linobudlelwane obusobala nokuqedwa kwe-hydroxyethyl cellulose, ngakho-ke ukunakekelwa okukhethekile kufanele kukhokhwe kukho.

4. Ungalokothi wengeze okuthile okune-alkali engxubeni ngaphambi kokuba i-hydroxyethyl cellulose powder ifudunyezwe ngamanzi. Ukuphakamisa inani elingu-PH ngemva kokufudumala kuyasiza ekuhlakazweni.

5. Ngokusemandleni akho, engeza ama-antifungal agents ngokushesha ngangokunokwenzeka.

6. Uma usebenzisa i-high-viscosity hydroxyethyl cellulose, ukugxila kotshwala kamama akufanele kube ngaphezu kuka-2.5-3%, ngaphandle kwalokho utshwala bomama buyoba nzima ukuphatha. I-hydroxyethyl cellulose ngemuva kokwelashwa ngokuvamile akulula ukwenza izigaxa noma ama-sphere, futhi ngeke yakhe ama-colloid ayindilinga angancibiliki ngemva kokungeza amanzi.


Isikhathi sokuthumela: Nov-15-2022
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