IHydroxypropyl methylcellulose (HPMC) iyinhlanganisela ye-polymer evamile enezinhlobonhlobo zezicelo zezimboni, ikakhulukazi emkhakheni wemithi, ukudla, izinto zokwakha kanye nezimonyo. Ukuncibilika kwamanzi nokujiya kwayo kuyenza ibe ukuqina okuhle, isinzisi kanye nefilimu yangaphambili. Lesi sihloko sizoxoxa ngokuningiliziwe ngenqubo yokuqedwa nokuvuvukala kwe-HPMC emanzini, kanye nokubaluleka kwayo ekusetshenzisweni okuhlukahlukene.
1. Isakhiwo kanye nezakhiwo ze-HPMC
I-HPMC iyi-ether engeyona ionic cellulose ekhiqizwa ukuguqulwa kwamakhemikhali kweselulosi. Ukwakheka kwayo kwamakhemikhali kuqukethe okufakwe esikhundleni se-methyl kanye ne-hydroxypropyl, ethatha indawo yamanye amaqembu e-hydroxyl kuketango lamangqamuzana e-cellulose, enikeza izakhiwo ze-HPMC ezihlukile kulezo ze-cellulose yemvelo. Ngenxa yesakhiwo sayo esiyingqayizivele, i-HPMC inezakhiwo ezibalulekile ezilandelayo:
Ukunyibilika kwamanzi: I-HPMC ingancibilika emanzini abandayo nashisayo futhi inezici eziqinile zokujiya.
Ukuzinza: I-HPMC inokuguquguquka okubanzi kumanani we-pH futhi ingahlala izinzile ngaphansi kwezimo zombili ezine-asidi ne-alkali.
I-Gelation eshisayo: I-HPMC inezici ze-gelation eshisayo. Lapho izinga lokushisa likhuphuka, isixazululo samanzi se-HPMC sizokwakha ijeli futhi sincibilike lapho izinga lokushisa lehla.
2. Indlela yokunwetshwa ye-HPMC emanzini
Uma i-HPMC ihlangana namanzi, amaqembu e-hydrophilic kuketango layo lamangqamuzana (njenge-hydroxyl ne-hydroxypropyl) azosebenzisana nama-molecule amanzi ukuze akhe amabhondi e-hydrogen. Le nqubo yenza iketango lamangqamuzana e-HPMC limunce amanzi kancane kancane futhi ande. Inqubo yokwandisa ye-HPMC ingahlukaniswa ngezigaba ezilandelayo:
2.1 Isigaba sokuqala sokumuncwa kwamanzi
Lapho izinhlayiya ze-HPMC ziqala ukuthintana namanzi, ama-molecule amanzi azongena ngokushesha ebusweni bezinhlayiya, abangele ukuthi ingaphezulu lezinhlayiya zande. Le nqubo ibangelwa ikakhulukazi ukusebenzisana okuqinile phakathi kwamaqembu e-hydrophilic kuma-molecule e-HPMC nama-molecule amanzi. Njengoba i-HPMC ngokwayo ingeyona i-ionic, ngeke incibilike ngokushesha njengama-polymer e-ionic, kodwa izomunca amanzi futhi inwebe kuqala.
2.2 Isigaba sokunwetshwa kwangaphakathi
Ngokuhamba kwesikhathi, amangqamuzana amanzi angena kancane kancane phakathi kwezinhlayiya, okwenza amaketanga e-cellulose angaphakathi ezinhlayiyeni aqale ukwanda. Izinga lokunwetshwa kwezinhlayiya ze-HPMC lizohamba kancane kulesi sigaba ngoba ukungena kwama-molecule amanzi kudinga ukunqoba ukuhlelwa okuqinile kwamaketanga wamangqamuzana ngaphakathi kwe-HPMC.
2.3 Qedela isigaba sokuhlakazwa
Ngemva kwesikhathi eside ngokwanele, izinhlayiya ze-HPMC zizoncibilika ngokuphelele emanzini ukuze zenze isisombululo se-viscous esifanayo. Ngalesi sikhathi, amaketanga amangqamuzana e-HPMC agoqeka ngokungahleliwe emanzini, futhi isisombululo siqiniswa ngokusebenzisana kwama-intermolecular. I-viscosity yesisombululo se-HPMC ihlobene eduze nesisindo sayo samangqamuzana, ukugxila kwesisombululo kanye nezinga lokushisa lokuqedwa.
3. Izinto ezithinta ukunwetshwa nokuqedwa kwe-HPMC
3.1 Izinga lokushisa
Ukuziphatha kokuhlakazeka kwe-HPMC kuhlobene eduze nezinga lokushisa lamanzi. Ngokuvamile, i-HPMC ingancibilika emanzini abandayo nasemanzini ashisayo, kodwa inqubo yokuhlakaza iziphatha ngendlela ehlukile emazingeni okushisa ahlukene. Emanzini abandayo, i-HPMC ivame ukumunca amanzi futhi ivuvuke kuqala, bese incibilika kancane; ngenkathi isemanzini ashisayo, i-HPMC izobhekana ne-gelation eshisayo ekushiseni okuthile, okusho ukuthi yakha ijeli kunesixazululo ekushiseni okuphezulu.
3.2 Ukugxilisa ingqondo
Uma kuphakeme ukugxiliswa kwesisombululo se-HPMC, izinga lokunwetshwa kwezinhlayiyana lihamba kancane, ngenxa yokuthi inani lama-molecule wamanzi kusixazululo sokugxiliswa okuphezulu esingasetshenziswa ukuhlanganisa namaketango e-molecular HPMC anomkhawulo. Ngaphezu kwalokho, i-viscosity yesisombululo izokhula kakhulu ngokunyuka kokuhlushwa.
3.3 Usayizi wezinhlayiya
Usayizi wezinhlayiyana ze-HPMC futhi uthinta izinga layo lokunwetshwa nokuqedwa. Izinhlayiya ezincane zimunca amanzi futhi zikhukhumale ngokushesha ngenxa yendawo yazo enkulu ethile, kuyilapho izinhlayiya ezinkulu zimunca amanzi kancane futhi zithatha isikhathi eside ukuncibilika ngokuphelele.
3.4 pH inani
Nakuba i-HPMC inokuvumelana nezimo okuqinile ezinguqukweni ze-pH, ukuziphatha kwayo kokuvuvukala nokuqedwa kungase kuthinteke ngaphansi kwezimo ezine-asidi ngokwedlulele noma ezine-alkaline. Ngaphansi kokungathathi hlangothi kuya kwezimo ezine-asidi ebuthakathaka futhi ezibuthakathaka ze-alkaline, inqubo yokuvuvukala nokuqedwa kwe-HPMC izinzile uma kuqhathaniswa.
4. Indima ye-HPMC ezinhlelweni ezahlukene
4.1 Imboni yezemithi
Embonini yezemithi, i-HPMC isetshenziswa kakhulu njengesihlanganisi kanye ne-disintegrant kumaphilisi emithi. Njengoba i-HPMC ikhukhumala emanzini futhi yakhe ijeli, lokhu kusiza ukunciphisa izinga lokukhululwa komuthi, ngaleyo ndlela kuzuze umphumela wokukhululwa olawulwayo. Ngaphezu kwalokho, i-HPMC ingasetshenziswa futhi njengengxenye eyinhloko yokuhlanganiswa kwefilimu yezidakamizwa ukuthuthukisa ukuzinza komuthi.
4.2 Izinto zokwakha
I-HPMC iphinde ibambe iqhaza elibalulekile ezintweni zokwakha, ikakhulukazi njengokuqina kanye nokugcina amanzi odaka lukasimende negypsum. Impahla yokuvuvukala ye-HPMC kulezi zinto iyenza ikwazi ukugcina umswakama ekushiseni okuphezulu noma ezindaweni ezomile, ngaleyo ndlela ivimbele ukwakheka kwemifantu futhi ithuthukise amandla okubopha wento.
4.3 Imboni Yokudla
Embonini yokudla, i-HPMC isetshenziswa njenge-thickener, emulsifier and stabilizer. Isibonelo, ezimpahleni ezibhakiwe, i-HPMC ingathuthukisa ukuzinza kwenhlama futhi ithuthukise ukuthungwa nokunambitha komkhiqizo. Ngaphezu kwalokho, izakhiwo zokuvuvukala ze-HPMC zingasetshenziswa futhi ukukhiqiza ukudla okunamafutha amancane noma okungenawo amafutha ukuze kwandiswe ukusutha nokuzinza.
4.4 Izimonyo
Kwezimonyo, i-HPMC isetshenziswa kakhulu emikhiqizweni yokunakekelwa kwesikhumba, ama-shampoos nama-conditioner njengento ejiya futhi eqinisayo. Ijeli eyakhiwe ngokunwetshwa kwe-HPMC emanzini isiza ukuthuthukisa ukuthungwa komkhiqizo futhi yakha ifilimu evikelayo esikhumbeni ukugcina isikhumba simanzi.
5. Isifinyezo
Indawo yokuvuvukala ye-HPMC emanzini iyisisekelo sokusetshenziswa kwayo okubanzi. I-HPMC inweba ngokumunca amanzi ukuze yakhe isixazululo noma ijeli ene-viscosity. Le ndawo iyenza isetshenziswe kabanzi emikhakheni eminingi efana nemithi, ezokwakha, ezokudla nezimonyo.
Isikhathi sokuthumela: Oct-09-2024