I-Hydroxypropyl Methylcellulose (HPMC) iyingxenye ye-polymer esetshenziswa kabanzi ekwakhiweni, emithini, ekudleni kanye nezinye izinkambu. Ngenxa yokugcinwa kwayo okuhle kakhulu kwamanzi, idlala indima ebalulekile ku-cunmer data, i-putty powder, ukumboza kanye namalungiselelo emithi. Ukugcinwa kwamanzi kwe-HPMC kuthintwa yizici eziningi, kufaka phakathi ukwakheka kwalo, izinga lokufaka esikhundleni, i-viscosity, inani lokungezelela, izinga lokushisa elikhona, ukumuncwa kwamanzi.
1. Ithonya lesakhiwo samangqamuzana kanye nezinga lokufaka esikhundleni
I-HPMC iqukethe isakhiwo se-cellulose skeleton ne-methoxy (-OCH₃) kanye ne-hydroxypropoxy (-Coch₂choHch₃), futhi izinga lawo lokufaka esikhundleni lidlala indima enkulu ekugcinweni kwamanzi. Ukuba khona kokungemthetho kwandisa i-hydrophicility ye-HPMC, kuyilapho futhi kuthinta i-solubility yayo kanye nezakhiwo ezenziwe ngefilimu. Ngokuvamile, kuphakama isilinganiso sokungena esikhundleni se-hydroxypropyl, okunamandla i-hydrophility kanye nokugcinwa kwamanzi kwe-HPMC. Okuqukethwe okuphezulu kwe-methoxy kusiza ukuthuthukisa i-solubity, okwenza kube lula ukukhiya emanzini futhi kunciphise izinga lokuhwamuka kwamanzi.
2. Umphumela Wokuqonda
I-viscosity ye-HPMC iyipharamitha ebalulekile ukukala izakhiwo zesithando zayo, okuvame ukuvezwa njengokubonakala kwesisombululo esingamanzi esingu-2% (MPA. Isixazululo esakhiwe nge-HPMC ephezulu kakhulu i-HPMC futhi singakha ifilimu yamanzi azinzile ebusweni bezinto ezibonakalayo, ukubambezela ukuhwamuka nokungena kwamanzi kanye nokuthuthukisa amandla okugcina amanzi. Isixazululo esiphansi se-HPMC se-HPMC sinobucwebe obuqinile futhi kufanelekile ukuthola izindawo zohlelo lokusebenza ezidinga ukukhishwa kwamanzi okusheshayo. Ngakho-ke, emasimini anjengesakhi udaka, ububonaziko i-HPMC ephakeme ilungele ukwenziwa ngcono ukugcinwa kwamanzi, kanti i-low-vissusity hpmc ilungele ukumiswa kwesicelo okudinga ukomisa okusheshayo.
I-3. Umphumela wenani lokungezelela
Ukusebenza kokugcinwa kwamanzi kwe-HPMC kukhuphuka ngokunyuka kwenani lesengezo, kepha okungcono kakhulu. Inani elifanele le-HPMC lingakha ifilimu elizinzile le-hydration ohlelweni lodaka noma olunama-coating, linciphise ukulahlekelwa ngokushesha kwamanzi, futhi sithuthukise ukusebenza kokwakha. Kodwa-ke, ukusetshenziswa ngokweqile kungaholela ekuboniseni ngokweqile futhi kuthinte ukusebenza kokwakha, njengokunciphisa uketshezi lodaka nokwandisa isikhathi sokusetha. Ngakho-ke, kuzinhlelo zokusebenza ezingokoqobo, inani le-HPMC lidinga ukucatshangelwa ngokugcwele ukufeza umphumela omuhle kakhulu wokugcina amanzi.
4. Umphumela wokushisa okukhona
Izinga lokushisa linomphumela obalulekile ekugcinweni kwamanzi kwe-HPMC. Ngaphansi kokushisa okuphezulu, amanzi avele ngokushesha, futhi amanzi odaka noma upende alahleka kalula, okuholela ekwehliseni ukusebenza kwezokwakha. I-HPMC inezakhiwo ezithile ze-gel ze-thermal. Lapho idlula izinga lokushisa lejeli, lizokwehlisa amanzi, lithinta umphumela wokugcina amanzi. Ngakho-ke, ezindaweni ezishisayo noma ezomile, kuyadingeka ukuthi ukhethe izinhlobo ezifanele ze-HPMC futhi zikhuphule kahle inani layo lokungezwa ukuze kuqinisekiswe ukugcinwa kwamanzi. Ngaphezu kwalokho, izinyathelo ezinjengokumboza kanye nokwelapha emanzi kungathathwa ukunciphisa ukulahleka kwamanzi.
I-5. Izinga lokutholwa kwamanzi
Ama-substrates ahlukene anekhono elihlukile lokutholwa kwamanzi, okuzothinta nokusebenza kokugcinwa kwamanzi kwe-HPMC. Ama-substrates anokufakwa kwamanzi okuphezulu, njengezitini, amabhodi e-gypsum, njll. Kulokhu, ukusetshenziswa kwe-high-viscosity, i-HPMC ephezulu kakhulu i-HPMC ingakha ifilimu ehlala isikhathi eside yamanzi yokugcina amanzi ngaphezulu ukuze kuncishiswe ukulahleka kwamanzi. Ngaphezu kwalokho, izinguquko ezifanele kwifomula, njengokungeza ama-ejenti okugcina amanzi noma ukunciphisa izinga lokufakwa kwamanzi kwe-substrate, nakho kungathuthukisa ukusebenza kokugcinwa kwamanzi okujwayelekile.
6. Ithonya lohlelo lokuqamba
I-HPMC imvamisa isebenza kanye nezinye izakhi ku-wortar, ama-putty noma ama-coating system, kanye nokugcinwa kwawo kwamanzi kuzothinteka ekwakhekeni okuphelele. Isibonelo, ingxenye yesimende, i-lime, i-gypsum egcwele ama-hypsum nezinye izinto eziqinisekisiwe ku-cement usimende ithinta ngqo isilinganiso se-hydration reaction rate. Ukusetshenziswa kwama-admixtures afana nama-agents angenisa umoya, abakhuthele, kanye nemicu kuzothinta isimo sokusabalalisa se-HPMC, ngaleyo ndlela siguqule umphumela waso wokugcina amanzi. Ngakho-ke, lapho kuklanywa ukwakhiwa, kuyadingeka ukuze ubheke ngokugcwele ukuxhumana phakathi kwe-HPMC nezinye izithako zokwandisa ukusebenza kokugcina kwamanzi.
Ukugcinwa kwamanzi kwe-HPMC kuthintwa yizici eziningi, kufaka phakathi ukwakheka kwamangqamuzana, i-degree yokufaka esikhundleni, i-viscosity, inani lokungezelela, izinga lokushisa lamanzi, izinga lokufakwa kwamanzi. Kuzinhlelo ezithile, kuyadingeka ukuthi ukhethe inani elifanelekile le-HPMC ahlukahlukene ngokwezindawo ezihlukile zokusebenzisa nezinto ezibonakalayo ukufezekisa umphumela omuhle kakhulu wokugcina amanzi. Ngaphezu kwalokho, ukuguqula ifomula kanye nenqubo ngokuhlanganiswa nezimo zokwakha nakho kungaphinde kube ngcono ukusebenza kokugcinwa kwamanzi futhi kuthuthukise ikhwalithi nokusetshenziswa komkhiqizo wokugcina.
Isikhathi sePosi: Feb-14-2025