IHydroxyethylcellulose (HEC) iwugqinsi oguquguqukayo futhi osebenzayo osetshenziswa kabanzi ezimbonini ezahlukahlukene.Le nhlanganisela isuselwa ku-cellulose, i-polymer yemvelo etholakala ngamanani amakhulu ezindongeni zamaseli ezitshalo.Izakhiwo ezihlukile ze-HEC ziyenza ilungele ukujiya imikhiqizo ehlukahlukene, kusukela emikhiqizweni yokunakekelwa komuntu siqu kuya ekwakhiweni kwezimboni.
Uhlolojikelele lweCellulose
I-Cellulose i-carbohydrate eyinkimbinkimbi eyakhiwe ngamaketanga aqondile ama-molecule e-glucose axhunywe ngamabhondi e-β-1,4-glycosidic.Iyingxenye eyinhloko yesakhiwo sezindonga zamaseli ezitshalo, ehlinzeka ngokuqina namandla kumaseli okutshala.Nokho, uhlobo lwayo lwendabuko aluncibiliki futhi lunomkhawulo wokusebenza kwezinye izinhlelo zokusebenza.
ama-derivatives we-cellulose
Ukuze kuthuthukiswe ukusebenza kwe-cellulose, okuphuma kokunye okuhlukahlukene kuye kwahlanganiswa ngokushintsha ukwakheka kwayo.Okunye okuphuma kulokhu yi-hydroxyethyl cellulose (HEC), lapho amaqembu e-hydroxyethyl ethulwa kumgogodla we-cellulose.Lokhu kuguqulwa kunikeza izakhiwo eziyingqayizivele ze-HEC, okuyenza inyibilike emanzini futhi isebenze kakhulu njengesishuqululi.
Imininingwane ye-HEC
Ukuncibilika
Esinye sezici eziyinhloko ze-HEC ukuncibilika kwayo emanzini.Ngokungafani ne-cellulose yemvelo, i-HEC incibilika kalula emanzini, yakha isisombululo esicacile.Lokhu kunyibilika kwenza kube lula ukuhlanganisa ezinhlobonhlobo zokwakheka.
Izakhiwo ze-Rheological
I-HEC ibonisa ukuziphatha kwe-pseudoplastic noma i-shear-thinning, okusho ukuthi i-viscosity yayo iyancipha ngaphansi kokucindezeleka kwe-shear futhi iyanda futhi ngemva kokukhululeka kokucindezeleka.Le rheology ibalulekile ekusetshenzisweni okudinga ukusabalalisa kalula noma ukuthululwa, njengokwakhiwa kwamapende, izinto zokunamathisela kanye nemikhiqizo yokunakekelwa komuntu siqu.
pH ukuzinza
I-HEC izinzile phezu kwebanga elibanzi le-pH, okuyenza ifanelekele ukusetshenziswa ekwakhiweni kwe-acidic, hlangothi kanye ne-alkaline.Lokhu kuguquguquka kube nomthelela ekwamukeleni kwayo kabanzi ezimbonini ezehlukene okubalwa kuzo ezezimonyo, ezemithi nezokudla.
Izicelo ze-HEC
imikhiqizo yokunakekelwa komuntu siqu
Ama-Shampoos nama-Conditioners: I-HEC ivame ukusetshenziselwa ukushubisa imikhiqizo yokunakekelwa kwezinwele, inikeze i-viscosity ekahle kanye nokwenza ngcono ukuthungwa okuphelele.
Ama-Cream and Lotions: Ekwenzeni ukunakekelwa kwesikhumba, i-HEC isiza ukufeza ukuvumelana okufunayo futhi ithuthukise ukusabalala kwamakhilimu nama-lotions.
Isixubho samazinyo: Ukuziphatha kwayo okuyi-pseudoplastic kusiza ukwakheka kwesixubho esivumela ukusatshalaliswa kalula nokusabalalisa ngesikhathi sokuxubha.
Amapende nama-Coatings
Upende weLatex: I-HEC isiza ukukhulisa i-viscosity nokuzinza kopende we-latex, iqinisekisa ngisho nokusebenza endaweni yonke.
Ama-Adhesives: Ekwakheni okunamathelayo, i-HEC isiza ukulawula i-viscosity futhi ithuthukise izakhiwo zokubopha.
umuthi
I-Oral Suspensions: I-HEC isetshenziselwa ukuqinisa ukumiswa komlomo ukuze kuhlinzekwe ifomu elizinzile nelizwakalayo lenhlanganisela yemithi.
Ama-gels we-topical: I-solubility ye-HEC emanzini iyenza ifanele ukwakhiwa kwama-gels we-topical, iqinisekisa ukusetshenziswa kalula nokumuncwa.
imboni yokudla
Amasoso nezingubo zokugqoka: I-HEC isetshenziselwa ukujiyisa amasoso nezingubo zokugqoka, ukuthuthukisa ukuthungwa nokuzwakala komlomo.
Imikhiqizo Ebhakiwe: Kwezinye izindlela zokupheka zokubhaka, i-HEC isiza ukujiyisa ama-batter nezinhlama.
Ukukhiqizwa nokulawulwa kwekhwalithi
ukuhlanganisa
I-HEC ivame ukukhiqizwa nge-etherification ye-cellulose nge-ethylene oxide ngaphansi kwezimo ezilawulwayo.I-degree of substitution (DS) yeqembu le-hydroxyethyl ingalungiswa ngesikhathi senqubo yokuhlanganiswa, ngaleyo ndlela ithinte ukusebenza kokugcina kwe-HEC.
QC
Izinyathelo zokulawula ikhwalithi zibalulekile ukuze kuqinisekiswe ukusebenza okungaguquki kwe-HEC ezinhlelweni ezihlukahlukene.Amapharamitha afana nesisindo samangqamuzana, izinga lokushintshwa kanye nobumsulwa aqashwe ngokucophelela phakathi nenqubo yokukhiqiza.
ukucatshangelwa kwemvelo
Njenganoma iyiphi inhlanganisela yamakhemikhali, izici zemvelo zibalulekile.I-HEC isuselwa ku-cellulose futhi ngokwemvelo ibola kakhulu kunezinye izingqimba zokwenziwa.Kodwa-ke, kubalulekile ukucabangela umthelela jikelele wemvelo wokukhiqizwa kwayo kanye nokusetshenziswa kwezinhlelo zokusebenza ezahlukene.
Ekuphetheni
Kafushane, i-hydroxyethylcellulose (HEC) igqama njenge-thickener esebenzayo futhi eguquguqukayo esebenza kuzo zonke izimboni eziningi.Izakhiwo zayo eziyingqayizivele, ezihlanganisa ukuncibilika kwamanzi, ukuziphatha kwe-rheological kanye nokuzinza kwe-pH, kuyenza ibe isithako esibalulekile ezinhlobonhlobo zokwakheka kwemikhiqizo.Njengoba izimboni ziqhubeka nokufuna ezinye izindlela ezingayingcolisi imvelo, izakhiwo ze-HEC ezibolayo ezitholakala ku-cellulose yezitshalo zikwenza kube ukukhetha okusimeme ezinhlobonhlobo zezinhlelo zokusebenza.Ucwaningo oluqhubekayo kanye nokuqanjwa okusha kokuphuma kwe-cellulose okufana ne-HEC kungase kuholele ekuthuthukisweni okwengeziwe, okuhlinzeka ngokusebenza okuphezulu kanye nomthelela oncishisiwe kwezemvelo.
Isikhathi sokuthumela: Dec-02-2023