IHydroxypropyl methylcellulose (HPMC) iyinhlanganisela esebenza ngezinto eziningi esetshenziswa kabanzi ezimbonini ezahlukahlukene ngenxa yokwakheka kwayo kwamakhemikhali kanye nezakhiwo ezihlukile.
1. Ukwakheka kwamakhemikhali:
a. Umgogodla weCellulose:
I-HPMC iphuma ku-cellulose, okusho ukuthi itholakala ku-cellulose, i-polysaccharide yemvelo etholakala ezindongeni zamaseli ezitshalo. I-Cellulose iqukethe amayunithi aphindayo we-β-D-glucose axhunywe ngamabhondi e-β(1→4) e-glycosidic.
b. Ukufaka esikhundleni:
Ku-HPMC, ingxenye ye-hydroxyl (-OH) yomgogodla we-cellulose ithathelwa indawo ngamaqembu e-methyl kanye ne-hydroxypropyl. Lokhu kushintsha kwenzeka ngokusabela kwe-etherification. I-Degree of substitution (DS) ibhekisela enanini eliyisilinganiso lamaqembu e-hydroxyl ashintshwa ngeyunithi ngayinye ye-glucose ochungechungeni lwe-cellulose. I-DS yamaqembu e-methyl kanye ne-hydroxypropyl ahlukile, okuthinta ukusebenza kwe-HPMC.
2. Ukuhlanganisa:
a. I-Etherification:
I-HPMC ihlanganiswa ngokusabela kwe-etherification ye-cellulose nge-propylene oxide ne-methyl chloride. Inqubo ibandakanya ukusabela kwe-cellulose nge-propylene oxide ukwethula amaqembu e-hydroxypropyl bese kuba nge-methyl chloride ukwethula amaqembu e-methyl.
b. Izinga lokulawula okunye:
I-DS ye-HPMC ingalawulwa ngokulungisa izimo zokusabela ezifana nezinga lokushisa, isikhathi sokusabela, nokugxiliswa kokusabela.
3. Ukusebenza:
a. Ukunyibilika:
I-HPMC iyancibilika emanzini nakwezinye izincibilikisi eziphilayo, njenge-methanol ne-ethanol. Nokho, ukunyibilika kwayo kuncipha ngokwanda kwesisindo samangqamuzana kanye nezinga lokushintshwa.
b. Ukwakhiwa kwefilimu:
I-HPMC yenza ifilimu esobala, eguquguqukayo lapho incibilika emanzini. Lawa mafilimu anamandla amahle emishini kanye nezakhiwo zokuthiya.
C. Viscosity:
Izixazululo ze-HPMC zibonisa ukuziphatha kwe-pseudoplastic, okusho ukuthi i-viscosity yazo iyancipha ngokukhuphuka kwesilinganiso sokugunda. I-viscosity yezixazululo ze-HPMC incike ezintweni ezifana nokugxilisa ingqondo, isisindo samangqamuzana, kanye nezinga lokushintshwa.
d. Ukugcinwa kwamanzi:
Enye yezinto ezibalulekile ze-HPMC yikhono layo lokugcina amanzi. Lesi sakhiwo sibalulekile ekusetshenzisweni okuhlukahlukene njengezinto zokwakha, lapho i-HPMC isetshenziswa njenge-thickener kanye ne-ejenti egcina amanzi.
e. Ukunamathela:
I-HPMC ivame ukusetshenziswa njenge-adhesive ezimbonini ezihlukahlukene ngenxa yekhono layo lokwakha izibopho eziqinile kuma-substrates ahlukene.
4. Isicelo:
a. Imboni yezemithi:
Kwezemithi, i-HPMC isetshenziswa njenge-binder, i-ejenti enamathelayo yefilimu, i-ejenti yokukhululwa elawulwayo, nesishintshi se-viscosity ekwakhiweni kwethebhulethi.
b. Imboni yezokwakha:
I-HPMC yengezwa odakeni olusekelwe kusimende, kumapulasi asekelwe ku-gypsum kanye nezinamatheliso zamathayela ukuze kuthuthukiswe ukusebenza kahle, ukugcinwa kwamanzi nokunamathela.
C. imboni yokudla:
Embonini yokudla, i-HPMC isetshenziswa njenge-thickener, stabilizer kanye ne-emulsifier emikhiqizweni efana namasoso, okokugqoka kanye no-ayisikhilimu.
d. Imikhiqizo yokunakekelwa komuntu siqu:
I-HPMC isetshenziswa njenge-thickener, emulsifier kanye ne-ejenti yokwakha ifilimu emikhiqizweni yokunakekela yomuntu siqu njengama-shampoos, okokugcoba kanye nokhilimu.
e. Amapende nama-Coatings:
Emapendeni nasezimbotsheni, i-HPMC isetshenziselwa ukuthuthukisa ukuhlakazeka kwe-pigment, ukulawulwa kwe-viscosity nokugcinwa kwamanzi.
IHydroxypropylmethylcellulose (HPMC) iyinhlanganisela eguquguqukayo enezinhlobonhlobo zezinhlelo zokusebenza kuzo zonke izimboni ezahlukahlukene. Ukwakheka kwayo kwamakhemikhali okuyingqayizivele, ukuhlanganisa kanye nezakhiwo kuyenza ibe isithako esibalulekile kwezemithi, izinto zokwakha, ukudla, imikhiqizo yokunakekelwa komuntu siqu kanye namapende/ezingubo zokumboza. Ukuqonda izakhiwo ze-HPMC kuvumela izinhlelo zokusebenza ezingokwezifiso emikhakheni ehlukene, okunomthelela ekusetshenzisweni kwayo okusabalele kanye nokubaluleka ezinqubweni zokukhiqiza zesimanje.
Isikhathi sokuthumela: Feb-22-2024