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Ungagcina kanjani futhi uthole i-viscosity ye-hydroxypropyl methylcellulose?

I-viscosity ebonakalayo iyinkomba ebalulekile ye-hydroxypropyl methylcellulose, izindlela zokulinganisa ezivame ukusetshenziswa zihlanganisa i-rotational viscometry, i-capillary viscometry kanye ne-drop viscometry.

IHydroxypropyl methylcellulose ngaphambilini yayikalwa kusetshenziswa i-capillary viscometry kusetshenziswa i-viscometer ye-Ubbelohde. Ngokuvamile isixazululo sokulinganisa siyisixazululo esinamanzi esingu-2, ifomula ithi: V = Kdt. I-V imele i-viscosity, i-K imelela i-viscometer engaguquki, d imele ukuminyana ekushiseni okungaguquki, t ibhekisela esikhathini kusukela phezulu kuya phansi kwe-viscometer, iyunithi ingeyesibili, le ndlela inzima ukuyisebenzisa futhi kulula ukuyibangela Okungalungile, futhi kunzima ukuhlukanisa ikhwalithi ye-hydroxypropyl methylcellulose.

Inkinga ye-delamination yeglue yokwakha yinkinga enkulu amakhasimende abhekana nayo. Okokuqala, inkinga yezinto zokusetshenziswa kufanele icatshangelwe ungqimba weglue wokwakha. Isizathu esiyinhloko sesendlalelo seglue yokwakha ukuthi i-polyvinyl alcohol (PVA) ne-hydroxypropyl methylcellulose (HPMC) azihambisani. Isizathu sesibili ukuthi isikhathi esishukumisayo asanele, futhi ukusebenza kokuqina kweglue yokwakha akulungile.

I-hydroxypropyl methylcellulose (HPMC) yokusungulwa kwamanje idinga ukusetshenziswa kuglue yokwakha, ngoba i-hydroxypropyl methylcellulose (HPMC) ihlakazekile emanzini futhi ayikwazi ukuncibilika ngempela, futhi i-viscosity yoketshezi ikhula kancane kancane emizuzwini emi-2, yakhe i-Transparent viscous colloid. .

Lapho imikhiqizo encibilikayo eshisayo ixubene ndawonye emanzini abandayo, izohlakazeka ngokushesha emanzini ashisayo futhi zinyamalale emanzini ashisayo. Lapho izinga lokushisa lehla lifinyelela ezingeni elithile lokushisa, i-viscosity izovela kancane kuze kube yilapho i-viscous colloid esobala yakheka. IHydroxypropyl ekunamathiseleni kokwakha Umthamo onconyiwe we-HPMC ngu-2-4kg.

IHydroxypropyl methylcellulose (HPMC) inezinto zamakhemikhali ezizinzile, ukumelana nesikhutha kanye nokugcinwa kahle kwamanzi ezintweni ezinamathelayo zokwakha, futhi ayithintwa izinguquko ze-pH. Ingasetshenziswa kusukela ku-100,000 S kuya ku-200,000 S, kodwa ukuphakama kwe-viscosity ekukhiqizeni, kungcono, futhi i-viscosity ihambisana ngokuphambene namandla okubopha. Ukuphakama kwe-viscosity, amandla aphansi, ngokuvamile i-viscosity ye-100,000 S ifanelekile.


Isikhathi sokuthumela: Apr-20-2023
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