Ngokuphathelele ubushushu bejeli ye-hydroxypropyl methyl celluloseI-HPMC, abasebenzisi abaninzi abasoloko benika ingqalelo kubushushu bejeli ye-hydroxypropyl methyl cellulose. Ngoku i-hydroxypropyl methyl cellulose idla ngokwahlulwa ngokwe-viscosity yayo, kodwa kwezinye iindawo ezikhethekileyo kunye namashishini akhethekileyo, ayanelanga ukubonisa kuphela i-viscosity yemveliso. Oku kulandelayo kwazisa ngokufutshane ubushushu bejeli ye-hydroxypropyl methylcellulose.
Umxholo wamaqela e-methoxy unxulumene ngokuthe ngqo nomlinganiselo we-dialysis ye-cellulose, kwaye umxholo wamaqela e-methoxy unokulungiswa ngokulawula ifomula, ubushushu bokusabela kunye nexesha lokuphendula. Kwangaxeshanye, umgangatho we-carboxylation uchaphazela umgangatho wokutshintshwa kwe-hydroxyethyl okanye i-hydroxypropyl. Ke ngoko, ukugcinwa kwamanzi kwe-cellulose ethers enobushushu obuphezulu be-gel ngokubanzi kubi kancinci. Le nkqubo yemveliso kufuneka ihlolwe, ngoko ke akusiyo ukuba umxholo weqela le-methoxy uphantsi, iindleko zemveliso ye-cellulose ether ziphantsi, ngokuchaseneyo, ixabiso layo liya kuba phezulu.
Ubushushu bejeli bumiselwa liqela le-methoxy, kwaye ukugcinwa kwamanzi kumiselwa liqela le-hydroxypropoxy. Kukho amaqela amathathu kuphela anokutshintshwa kwi-cellulose. Fumana ubushushu obufanelekileyo bokusetyenziswa, ukugcinwa kwamanzi okufanelekileyo, uze umisele imodeli yale cellulose.
Ubushushu bejeli yeyona nto ibalulekileyo ekusetyenziswenii-cellulose etherXa ubushushu obujikeleze umhlaba budlula ubushushu bejeli, i-cellulose ether iyahlukana namanzi ize ilahlekelwe kukugcinwa kwamanzi. Ubushushu bejeli ye-cellulose ether ethengiswayo bunokuhlangabezana neemfuno zokusingqongileyo apho kusetyenziswa khona i-mortar (ngaphandle kweendawo ezikhethekileyo). Abavelisi kufuneka bakuthathele ingqalelo oku.
Ixesha leposi: Epreli-26-2024