1. Isingeniso se-Hydroxyethyl Cellulose (HEC):
IHydroxyethylcellulose iphuma ku-cellulose encibilika emanzini, i-polymer yemvelo etholakala ezindongeni zamaseli ezitshalo. Ukuguqulwa kwe-cellulose ngamaqembu e-hydroxyethyl kuthuthukisa ukuncibilika kwayo emanzini futhi kunikeza izakhiwo ezithile ku-HEC, okwenza i-HEC ibe yinto ebalulekile ekusetshenzisweni okuhlukahlukene.
2. Isakhiwo se-HEC:
Isakhiwo se-HEC sitholakala ku-cellulose, i-polysaccharide eqondile eyakhiwe amayunithi e-glucose aphindaphindiwe axhunywe ngamabhondi e-β-1,4-glycosidic. Amaqembu e-Hydroxyethyl angeniswa kumgogodla we-cellulose ngokusabela kwe-etherification. I-Degree of substitution (DS) ibhekisela enanini eliyisilinganiso lamaqembu e-hydroxyethyl ngeyunithi ngayinye ye-glucose futhi ithinta ukunyibilika nokubonakala kwe-HEC.
3. Izici ze-HEC:
A. Ukunyibilika kwamanzi: Enye yezinto ezibalulekile ze-HEC ukuncibilika kwayo okuphezulu emanzini, okubangelwa ukushintshwa kwe-hydroxyethyl. Lesi sakhiwo senza kube lula ukwenza izixazululo kanye ne-dispersions ezifanele izinhlelo zokusebenza ezihlukahlukene.
b. Ikhono lokujiya: I-HEC yaziwa kabanzi ngezakhiwo zayo ezijiyayo ezixazululweni ezinamanzi. Uma ihlakazekile emanzini, yenza ijeli ecacile ne-viscous, eyenza ifaneleke izinhlelo zokusebenza ezidinga ukulawulwa kwe-viscosity.
C. pH Ukuzinza: I-HEC ibonisa ukuzinza phezu kwebanga elibanzi le-pH, iyenze ihambisane nokwakheka kuzo zombili izindawo ezine-asidi ne-alkali.
d. Ukuqina kwezinga lokushisa: Izixazululo ze-HEC zihlala zizinzile ebangeni lokushisa elibanzi. Bangakwazi ukungena emijikelezweni eminingi yokufudumeza nokupholisa ngaphandle kwezinguquko ezibalulekile ku-viscosity noma ezinye izakhiwo.
e. Ukwakhiwa kwefilimu: I-HEC ingakha amafilimu aguquguqukayo nasobala afanele ukusetshenziswa okufana nokumbozwa, okunamathelayo namafilimu.
F. Umsebenzi Wendawo: I-HEC inezinto ezifana ne-surfactant, enenzuzo ezinhlelweni ezidinga ukulungiswa kwendawo noma ukuqiniswa.
4. Ukuhlanganiswa kwe-HEC:
Ukuhlanganiswa kwe-HEC kuhilela ukusabela kwe-etherification ye-cellulose ne-ethylene oxide phambi kwe-catalyst ye-alkaline. Ukusabela kungalawulwa ukuze kuzuzwe izinga elifiswayo lokushintshwa, ngaleyo ndlela kuthinte izakhiwo zokugcina zomkhiqizo we-HEC. I-synthesis ngokuvamile yenziwa ngaphansi kwezimo ezilawulwayo ukuze kuqinisekiswe ukuvumelana komkhiqizo kanye nekhwalithi.
5. Ukusetshenziswa kwe-HEC:
A. Paints and Coatings: I-HEC isetshenziswa kabanzi njenge-thickener kumapende asekelwe emanzini kanye nama-coatings. Ithuthukisa i-rheology, ithuthukise ukuxubha, futhi ifake isandla ekuzinzeni kokwakheka.
b. Imikhiqizo yokunakekelwa komuntu siqu: I-HEC iyisithako esivamile emikhiqizweni yokunakekelwa komuntu siqu njengama-shampoos, ama-lotions nama-creams. Isebenza njenge-thickener, stabilizer kanye ne-ejenti yokwakha ifilimu, ithuthukisa ukusebenza okuphelele kwalezi zakhiwo.
C. Ezemithi: Embonini yezemithi, i-HEC isetshenziswa ekwenziweni komlomo kanye nesihloko. Ingasebenza njenge-binder, disintegrant, noma i-matrix yangaphambili ekwakhiweni kwethebulethi, futhi njengesilungisi se-viscosity kumajeli wezihloko nokhilimu.
d. Izinto zokwakha: I-HEC isetshenziswa embonini yezokwakha njenge-ejenti yokugcina amanzi ekwakhiweni okusekelwe kusimende. Ithuthukisa ukusebenza kokwakhiwa, inweba isikhathi esivulekile, futhi ithuthukise ukunamathela kwezinamathelisi zamathayili nodaka.
e. Imboni Kawoyela Negesi: I-HEC isetshenziswa embonini kawoyela negesi njenge-ejenti ejiya yokumba uketshezi. Isiza ukulawula i-viscosity futhi inikeza izakhiwo zokumisa ukuvimbela izinhlayiya ukuthi zingahlali.
F. Imboni Yokudla: I-HEC isetshenziswa embonini yokudla njenge-thickener, stabilizer kanye ne-gelling agent emikhiqizweni eyahlukene, okuhlanganisa amasoso, okokugqoka kanye nama-dessert.
6. Ukucatshangelwa kwemithetho:
I-HEC ngokuvamile ibonwa njengephephile (i-GRAS) yizinkampani ezilawulayo futhi ukusetshenziswa kwayo ezinhlelweni ezihlukahlukene kulawulwa ukuze kuqinisekiswe ukuphepha kwabathengi nokusebenza komkhiqizo. Abakhiqizi kufanele bahambisane nemithetho yesifunda futhi bathole ukugunyazwa okudingekayo kwezicelo ezithile.
7. Amathrendi nokuqanjwa kwesikhathi esizayo:
Ucwaningo oluqhubekayo lugxile ekuthuthukisweni kokuphuma kokunye okuguquliwe kwe-HEC okunezakhiwo ezithuthukisiwe zezinhlelo ezithile zokusebenza. Kuphinde kugxilwe ekugxileni ekusungulweni kwezinto ezintsha ezindleleni ezisimeme zokuthola izinto nezindlela zokukhiqiza ukuze kubhekwane nezindaba zemvelo kanye nokukhuthaza ezinye izindlela ezingayingeni imvelo.
IHydroxyethylcellulose (HEC) iyi-polymer eguquguqukayo, eguquguqukayo enezici ezihlukile njengokuncibilika kwamanzi, amandla okuqina, nokuzinza kwezinga lokushisa. Kusukela kumapende nama-coatings kuya ezimbonini zemithi nezokudla, i-HEC idlala indima ebalulekile ekuthuthukiseni ukusebenza kwemikhiqizo ehlukahlukene. Njengoba ucwaningo nentuthuko iqhubeka, i-HEC kungenzeka iqhubeke ibambe iqhaza elibalulekile ezimbonini ezihlukahlukene, ibe neqhaza ekuthuthukisweni kwezinto zokwakha kanye nokwakheka.
Isikhathi sokuthumela: Dec-29-2023