Uyini umehluko phakathi kwe-hydroxypropylllm methylcellulose ne-hydroxyethyl cellulose?

I-Hydroxypropylmethylcellellellellose (HPMC) neHydroxyEthylcellulose (HEC) yizinhlobo ezimbili ezijwayelekile ze-cellulose derivatives ezisetshenziswa ezimbonini eziningi. Yize babelana ngokufana okuthile, kukhona nokwehluka okuningi, okubandakanya ukwakheka kwamakhemikhali, izakhiwo zenyama, kanye nezicelo.

isakhiwo samakhemikhali

Umehluko omkhulu phakathi kwe-HPMC ne-HEC isakhiwo sabo samakhemikhali. I-HPMC i-polymer yokwenziwa eyenziwe ngokuphendula i-cellulose nge-propelene oxide ne-methyl chloride. Inqubo ikhiqiza ama-polymers awokubili i-hydrophilic ne-lipophilic, okwenza babe izithako ezijwayelekile emikhiqizweni eminingi yezimboni, kufaka phakathi ukunakekelwa komuntu siqu kanye nemithi.

Ngakolunye uhlangothi, i-hec, iyi-biopolymer etholakala ku-cellulose. Kukhiqizwa ukusabela kwe-cellulose nge-ethylene oxide, eyakha amaqembu e-hydroxyethyls kuma-molecule e-cellulose. Lokhu kwakha i-polymer engenamanzi enezinhlangothi ezinhle kakhulu kanye ne-rheological, okwenza kube lula ukuthola izicelo eziningi.

Izakhiwo Ezibonakalayo

I-HPMC ne-HEC inezindawo ezahlukahlukene zomzimba ngenxa yezinhlaka zazo ezihlukile zamakhemikhali. Isibonelo, i-HPMC i-hydrophophobic ngaphezulu kune-HEC, okusho ukuthi ayincibilikise emanzini. Ngakho-ke, i-HPMC ivame ukusetshenziswa njenge-stabilizer ne-emulsifier emikhiqizweni esekwe okhilimu kanye nama-lotions. Ngakolunye uhlangothi, ngakolunye uhlangothi, kuncibilikiswa kakhulu emanzini futhi kuvame ukusetshenziswa njenge-ejenti enkulu kanye ne-ejenti ye-gelling ngezixazululo zamanzi.

Enye impahla ebonakalayo ye-HPMC ne-HEC ukuhlakanipha kwawo. I-HEC inokuvunywa okuphezulu kune-HPMC, okusho ukuthi isebenza kahle kakhulu ezixazululweni zokuqina kanye nokwakha ama-gels. Le mpahla yenza i-hec ilungele ukusetshenziswa kupende kanye nokumboza, ukunamathela, kanye neminye imikhiqizo edinga ukuthungwa kwesibopho esiminyene.

Izindawo zohlelo lokusebenza

I-HPMC ne-HEC kusetshenziswa kabanzi kwizimboni ezahlukahlukene. I-HPMC isetshenziswa kakhulu embonini yezemithi njengezinamathela, ukumboza kanye nezinhlelo zokulethwa kwezidakamizwa. Iphinde isetshenziswe njengesikhulu kanye ne-emulsifier emikhiqizweni yokunakekelwa komuntu siqu efana nama-shampoos, insipho kanye nezimonyo. I-HPMC nayo isetshenziswa njengesengezo sokudla kanye nokwenziwa kwemikhiqizo yamaphepha.

Ngakolunye uhlangothi, i-HEC, ivame ukusetshenziswa njenge-ejenti enkulu kanye ne-ejenti ye-gelling ezinhlobonhlobo zezimboni. Embonini we-Paint and Coatings, i-HEC isetshenziswa njengesikhulu, i-Rheology modifier kanye nosizo lokumiswa. Iphinde isetshenziswe njenge-ejenti yokugcina amanzi embonini yezokwakha nasekwenziweni kwezikhangiso, izindwangu nama-ceramics.

I-HPMC ne-HEC kungama-cellulose ama-cellulose ama-cellulose anezinhlaka ezahlukahlukene zamakhemikhali, izakhiwo ezibonakalayo kanye nezicelo. I-HPMC i-hydrophopobic eyengeziwe futhi isetshenziswa ezinhlotsheni ezahlukahlukene, ngenkathi i-hec incibilika amanzi futhi ilungele ukuqina kwezixazululo zamanzi nokwakha ama-gels. Kubalulekile ukuqonda umehluko phakathi kwalezi zinto ezimbili ze-cellulose lapho ukhetha isithako esifanele ukuthola uhlelo oluthile.