Index ea viscosity ea hydroxypropyl methylcellulose ke index ea bohlokoa haholo.Viscosity ha e emele bohloeki.The viscosity ea cellulose HPMC itšetlehile ka tshebetso tlhahiso.Libaka tse fapaneng tsa ts'ebeliso li lokela ho khetha HPMC ea cellulose e nang le li-viscosity tse fapaneng, eseng ho phahama ha viscosity ea cellulose HPMC, ho molemo!Se nepahetseng se nepahetse!
1. Taolo ea viscosity
High-viscosity hydroxypropyl methylcellulose ha e khone ho hlahisa selulose e phahameng haholo feela ka vacuum le phetoho ea naetrojene tlhahisong.Ka kakaretso, tlhahiso ea cellulose e phahameng ea viscosity Chaena e ke ke ea laoloa.Leha ho le joalo, haeba meter ea trace oksijene e ka kenngoa ka kettle, tlhahiso ea viscosity ea eona e ka laoloa ka maiketsetso.
2. Tšebeliso ea moemeli oa mokhatlo
Ho phaella moo, ha ho nahanoa ka lebelo la ho nkela naetrojene sebaka, ho bonolo ho hlahisa lihlahisoa tse nang le viscosity e phahameng ho sa tsotellehe hore na tsamaiso e thibela moea hakae.Ehlile, tekanyo ea polymerization ea k'hothone e hloekisitsoeng le eona e bohlokoa.Haeba seo se sa sebetse, se etse ka hydrophobic association.Ho na le baemeli ba mekhatlo sebakeng sena Chaena.Ke mofuta ofe oa moemeli oa mokhatlo oo u ka o khethang o nang le tšusumetso e kholo ts'ebetsong ea sehlahisoa sa ho qetela.
3. Likahare tsa Hydroxypropyl
Oksijene e setseng ka har'a reactor e baka ho senyeha ha selulose le ho fokotseha ha boima ba molek'hule, empa oksijene e setseng e lekanyelitsoe, ha feela limolek'hule tse robehileng li kopantsoe hape, ha ho thata ho etsa viscosity e phahameng.Leha ho le joalo, sekhahla sa saturation se amana haholo le litaba tsa hydroxypropyl.Lifeme tse ling li batla feela ho fokotsa litšenyehelo le theko, empa ha li ikemisetse ho eketsa litaba tsa hydroxypropyl, kahoo boleng bo ke ke ba fihla boemong ba lihlahisoa tse tšoanang tsa linaheng tse ling.
4. Lintlha tse ling
Sekhahla sa ho boloka metsi sa sehlahisoa se na le kamano e ntle le hydroxypropyl, empa bakeng sa ts'ebetso eohle ea karabelo, e boetse e lekanyetsa sekhahla sa ho boloka metsi, phello ea alkalization, karolelano ea methyl chloride le propylene oxide, mahloriso a alkali le ho boloka metsi.Karolelano ea k'hothone e hloekisitsoeng e etsa qeto ea hore na sehlahisoa se sebetsa joang.
Nako ea poso: Apr-04-2023