IHydroxypropyl methyl cellulose (HPMC), impahla eluhlazai-cellulose, kungaba ukotini elicwengekile noma ukhuni uginindela. Kuyadingeka ukuyihlikihla ngaphambi noma ngesikhathi senqubo ye-alkalization. I-pulverization yenziwa ngamandla emishini. Ukucekela phansi isakhiwo esihlanganisiwe sezinto zokusetshenziswa ze-cellulose ukuze kwehliswe icrystallinity kanye ne-polymerization degree futhi kwandiswe indawo yayo engaphezulu, ngaleyo ndlela kuthuthukiswe ukufinyeleleka nekhono lokusabela kwamakhemikhali lama-reagents kumaqembu amathathu e-hydroxyl kusisekelo seringi ye-cellulose macromolecular glucose.
IHydroxypropyl methyl cellulose (HPMC)isetshenziswa njenge-substrate ye-raw material ukukhiqiza uwoyela, ongaqaphela ukusetshenziswa kukashukela wonke, uthuthukise izinga lokusetshenziswa kwezinto ezingavuthiwe, unciphise inani elisele le-substrate kumhluzi wokuvutshelwa, futhi wehlise izindleko zokuhlanza amanzi angcolile. Izici zei-methyl celluloseasiza ekuthuthukisweni kweqoqo, inqwaba ephakelwayo kanye nezinqubo zokuvutshelwa okuqhubekayo, ukugwema uchungechunge lwezinkinga ezinjengokulawula ukwakheka kwendawo ephakathi nendawo kanye nezinga lokuhlanjululwa; ngesikhathi esifanayo, kuyasiza futhi ekulawuleni inqubo yokuvutshelwa. Ngoba izakhiwo zei-hydroxypropyl methyl cellulose (HPMC)zifana namanye ama-ethers ancibilikayo emanzini, angasetshenziswa njenge-ejenti eyenza ifilimu, i-thickener, i-emulsifier kanye ne-stabilizer embotsheni ye-latex kanye nezingxenye zokugqoka i-resin encibilikayo emanzini, okwenza kube nokwenzeka ukwenza izigqoko Ifilimu inokumelana okuhle kwe-abrasion, ukulinganisa. izakhiwo kanye nokunamathela, futhi kuye kwathuthukisa ukungezwani kwendawo, ukuzinza ku-asidi ne-alkali, nokuhambisana nezingulube zensimbi.
IHydroxypropyl methyl cellulose (HPMC)inomphumela omuhle njenge-thickener yezingubo ezimhlophe ze-polyvinyl acetate ezisekelwe emanzini. Izinga lokushintshwa kwei-cellulose etherkwanda, futhi ukumelana nama-bacterium kanye nokuguguleka nakho kuyathuthukiswa.
Nakuba umgomo we-etherification synthesis ye-hydroxypropyl methylcellulose (HPMC) ungeyona inkimbinkimbi, uwukuba alkalization, ukuchotshozwa kwempahla eluhlaza, kanye ne-alkalization. Izimo ezihlukahlukene zokufaka i-etherification, ukutholakala kwe-solvent, ukuhlukaniswa kwe-centrifugal, ukuwasha nokomisa kuhilela inombolo enkulu yobuchwepheshe obubalulekile nolwazi olucebile.
Ezinhlotsheni ezahlukene zemikhiqizo, indawo ngayinye inezimo zokulawula zakamuva, ezifana nezinga lokushisa, isikhathi, ingcindezi nokulawula ukugeleza kwezinto. Imishini eyisiza namathuluzi okulawula ayisiqinisekiso esinokwethenjelwa nesizuzisayo sekhwalithi yomkhiqizo ozinzile kanye nohlelo lokukhiqiza oluthembekile.
Izici zomkhiqizo wei-hydroxypropyl methyl cellulose:
1. Izakhiwo: Lo mkhiqizo uyimpushana emhlophe, futhi awunaphunga, awunambitheki futhi awunabuthi.
2. Umphumela wokugcina amanzi: Ngoba lo mkhiqizo ungamunca amanzi ngokuphindwe kaningi kunawo. Gcina ukugcinwa kwamanzi okuphezulu kudaka, i-gypsum, upende neminye imikhiqizo.
3. Lo mkhiqizo ungancibilika emanzini abandayo ukuze wenze i-solvent viscous esobala.
4. Ukuncibilika kuzincibilikisi zemvelo: Ngenxa yokuthi iqukethe inani elithile lezakhi zofuzo ze-hydrophobic, lo mkhiqizo ungancibilika kwezinye izinyibilikisi zemvelo, futhi ungancibilika kuzincibilikisi ezixubile zamanzi nezinto eziphilayo.
5. Ukumelana nosawoti: Njengoba lo mkhiqizo ungeyona i-ionic futhi engeyona i-polyelectrolyte, uzinzile kuzixazululo ezinamanzi zosawoti wensimbi noma ama-electrolyte e-organic. Endabeni ye-electrolyte eningi, ingase ibangele i-gelation noma imvula.
6. Umsebenzi ongaphezulu: Isixazululo esinamanzi salo mkhiqizo sinomsebenzi ongaphezulu.
Isikhathi sokuthumela: Nov-29-2021
