I-Methylcellulose imhlophe okanye i-off-white fibrous okanye i-granular powder; ayinavumba kwaye ayinancasa. Le mveliso idumba kwisisombululo esicacileyo okanye esincinci se-colloidal emanzini; ayinyibiliki kwi-ethanol, i-chloroform okanye i-ether. Ukusabalalisa ngokukhawuleza kunye nokuvuvukala emanzini atshisayo kwi-80-90 ° C, kwaye uchithe ngokukhawuleza emva kokupholisa phantsi. Isisombululo se-aqueous sizinzile kwiqondo lokushisa, kwaye siyakwazi i-gel kwiqondo lokushisa eliphezulu, kwaye i-gel inokutshintsha kunye nesisombululo kunye nobushushu.
Inobumanzi obugqwesileyo, i-dispersibility, i-adhesiveness, i-thickening, i-emulsification, ukugcinwa kwamanzi kunye neempawu zokwenza ifilimu, kunye nokungangeni kwioli. Ifilimu eyenziweyo inokuqina okubalaseleyo, ukuguquguquka kunye nokungafihli. Ngenxa yokuba i-non-ionic, inokuhambelana nezinye i-emulsifiers, kodwa kulula ukuyikhupha ityuwa, kwaye isisombululo sizinzile kuluhlu lwe-PH2-12. I-Sodium Carboxymethyl Cellulose Le mveliso yityuwa yesodium ye-cellulose carboxymethyl ether, eyi-anionic cellulose ether, emhlophe okanye i-milky fibrous powder okanye i-granules, kunye nobuninzi be-0.5-0.7 g / cm3, phantse ivumba kwaye ingenancasa , kunye ne-hygroscopicity. Ukusasazwa ngokulula emanzini ukwenza isisombululo se-colloidal esicacileyo, esinganyibilikiyo kwizinyibilikisi zezinto eziphilayo ezifana ne-ethanol.
I-pH yesisombululo samanzi ngu-6.5-8.5. Xa i-pH i> 10 okanye <5, i-viscosity yeglue iya kuncitshiswa kakhulu, kwaye ukusebenza kuyona nto ibhetele xa i-pH i-7. Izinzile ekushiseni, i-viscosity iphakama ngokukhawuleza ngaphantsi kwe-20 ° C, kwaye itshintsha ngokukhawuleza kwi-45. °C. Ukufudumala kwexesha elide ngaphezu kwe-80 ° C kunokunciphisa i-colloid kwaye kunciphise kakhulu i-viscosity kunye nokusebenza. Inyibilika ngokulula emanzini, kwaye isisombululo siyabonakala; izinzile kakhulu kwisisombululo se-alkaline, kodwa i-hydrolyzed ngokulula xa idibana ne-asidi, kwaye iya kudlula xa ixabiso le-pH liyi-2-3, kwaye liya kusabela kunye neetyuwa ze-polyvalent metal. IHydroxypropyl methylcellulose, ekwaziwa ngokuba yihypromellose kunye neselulosi ihydroxypropyl methyl ether, yenziwe ngeselulosi yomqhaphu esulungekileyo kakhulu njengezinto ezikrwada, ezifakwa etherified ngokukodwa phantsi kweemeko zealkaline.
I-Soluble emanzini kunye nobuninzi be-polar c kunye nemilinganiselo efanelekileyo ye-ethanol / amanzi, ipropanol / amanzi, i-dichloroethane, njl., enganyibilikiyo kwi-ether, i-acetone, i-ethanol epheleleyo, kwaye idumba ibe yi-colloid ecacileyo okanye encinci yamafu kwisisombululo samanzi abandayo. Isisombululo samanzi sinomsebenzi ongaphezulu, ukukhanya okuphezulu kunye nokusebenza okuzinzileyo. I-HPMC inepropati ye-thermal gelation. Imveliso yesisombululo se-aqueous ishushu ukuze yenze i-gel kunye ne-precipitates, kwaye idibanise emva kokupholisa. Ukushisa kwe-gelation yeenkcukacha ezahlukeneyo kuyahluka.
Ixesha lokuposa: Feb-24-2023