Emhlabeni wamakhemikhali, kunezinhlanganisela eziningi ezinezakhiwo ezifanayo kodwa ezihlukile ekusebenzeni kwazo. Isibonelo esisodwa i-hydroxypropyl methylcellulose (HPMC) ne-hydroxyethyl cellulose (HEC). Lezi ziphuma ezimbili ze-cellulose zisetshenziswa kakhulu ezimbonini ezihlukahlukene, kodwa ukuqonda izici zazo ezihlukile kubalulekile ekukhetheni okuphuma kokunye okulungile kohlelo oluthile.
I-Hydroxypropyl methylcellulose, evame ukwaziwa nge-HPMC, iwukuphuma kokwenziwa kwe-cellulose. Itholakala ngokwelapha i-cellulose yemvelo nge-propylene oxide ne-methyl chloride, futhi yethule i-hydroxypropyl kanye namaqembu e-methyl ngokulandelana. Lokhu kuguqulwa kuthuthukisa ukuncibilika kwamanzi kwe-cellulose futhi kuthuthukisa izakhiwo zayo jikelele. Ngakolunye uhlangothi, i-hydroxyethyl cellulose (HEC) nayo iphuma ku-cellulose etholakala ngokusabela kwe-cellulose yemvelo kanye ne-ethylene oxide. Ukwethulwa kwamaqembu e-hydroxyethyl kuholela ekwandeni kokuncibilika kwamanzi kanye nezakhiwo ezijiya.
Omunye umehluko omkhulu phakathi kwe-HPMC ne-HEC izindawo zabo zokufaka izicelo. I-HPMC inezinhlobonhlobo zokusetshenziswa embonini yezokwakha. Isetshenziswa kabanzi njenge-thickener emikhiqizweni esekwe usimende njengama-adhesives amathayili, udaka lwengxube eyomile kanye nezinhlanganisela zokuzilinganisa. Ngenxa yezindawo zayo zokugcina amanzi, i-HPMC ithuthukisa ukusebenza, ukunamathela kanye nokuqina kwalezi zinto zokwakha. Ukwengeza, i-HPMC isetshenziswa njenge-ejenti eyenza ifilimu kuma-coatings namapende, ihlinzeka ngokumelana namanzi okuhle kakhulu kanye nokucwebezela.
I-HEC, ngakolunye uhlangothi, isetshenziswa ngokuyinhloko ekunakekelweni komuntu siqu nasezimonyoni. Isetshenziswa njenge-thickener, emulsifier kanye ne-stabilizer kumakhilimu, ama-lotions, ama-shampoos neminye imikhiqizo yobuhle. I-HEC ithuthukisa i-viscosity yalawa mafomula, okuholela ekuthunjweni okungcono, ukusabalala kanye nokusebenza komkhiqizo kukonke. Amakhono ayo okwenza ifilimu aphinde ayenze ibe isithako esifanelekile kumajeli ezinwele nama-mousses, ihlinzeka ngokubamba okuhlala isikhathi eside ngaphandle kokunamathela.
Omunye umehluko obalulekile uhla lwe-viscosity lwalezi zinhlanganisela. I-HPMC ngokuvamile ine-viscosity ephezulu kune-HEC. Lo mehluko we-viscosity wenza i-HEC ifaneleke kakhulu ezinhlelweni ezidinga ukusebenza kokuqina okuphansi kuya kokumaphakathi. I-HEC inikeza ukuqina okuhle kakhulu nokulawula ukugeleza ekwakhekeni kwe-liquid, iqinisekisa ngisho nokusatshalaliswa kwezithako ezisebenzayo. I-viscosity ephezulu ye-HPMC, ngakolunye uhlangothi, iyenza ifaneleke izinhlelo zokusebenza ezidinga ukujiya okumaphakathi kuya kokuphezulu, njengezinto zokwakha.
Ngaphezu kwalokho, i-HPMC ne-HEC ziyahlukahluka ekusebenzisaneni kwazo nezinye izithako zamakhemikhali. I-HPMC inokuhambisana okuhle kakhulu nezinhlobonhlobo zezithasiselo kanye nokubekezelela kahle usawoti kanye nezinto ezisetshenziswayo, okuyenza ibe nezinto ezihlukahlukene ekwakhekeni okuhlukahlukene. I-HEC, nakuba ngokuvamile ihambisana nezithako eziningi, ingase ibe nezinkinga ezithile zokuhambisana nosawoti othile, ama-asidi, nama-surfactants. Ngakho-ke, lapho ukhetha phakathi kwe-HPMC ne-HEC, kubalulekile ukucabangela izimfuneko zokuhambisana zokwakheka okuthile.
Kafushane, i-HPMC kanye ne-HEC, njengokuphuma kwe-cellulose, banezakhiwo zabo eziyingqayizivele kanye nezicelo. Ukuqonda umehluko phakathi kwalezi zinhlanganisela kubalulekile ekukhetheni inhlanganisela efanele yesicelo esithile. I-HPMC isetshenziswa kakhulu embonini yezokwakha njenge-ejenti ejiya futhi eyenza amafilimu, kuyilapho i-HEC isetshenziswa kakhulu emikhiqizweni yokunakekelwa komuntu siqu njenge-thickener ne-stabilizer. Ngokucabangela izidingo ze-viscosity nokuhambisana nezinye izithako, i-derivative ye-cellulose efanelekile kakhulu ingakhethwa, iqinisekise ukusebenza kahle kanye nemiphumela oyifunayo kumkhiqizo wokugcina.
Siyabonga ngokubambisana kwakho ne-JINJI CHEMICAL.
Isikhathi sokuthumela: Nov-14-2023