Zithini iziphumo zobungakanani bevumba kwi-hydroxypropyl methylcellulose:
Udibaniso lweihydroxypropyl methylcellulose: Phatha i-cotton cellulose ecocekileyo nge-lye kwi-35-40 ° C isiqingatha seyure, cinezela, utyumze i-cellulose, kunye nobudala ngokufanelekileyo kwi-35 ° C, ukwenzela ukuba iqondo eliqhelekileyo le-polymerization ye-alkali efunyenweyo ingaphakathi kwimicu efunekayo ngaphakathi. Faka i-alkali fiber kwi-kettle ye-etherification, yongeza i-propylene oxide kunye ne-methyl chloride ngokulandelelana, kwaye i-etherify kwi-50-80 ° C kwiiyure ze-5, uxinzelelo oluphezulu malunga ne-1.8MPa. Emva koko faka inani elifanelekileyo le-hydrochloric acid kunye ne-oxalic acid kumanzi atshisayo kwi-90 ° C ukuhlamba izinto zokwandisa umthamo. Dehydrate kwicentrifuge. Geza ngamanzi uze ungathathi hlangothi. Xa ubumanzi bezinto eziphathekayo bungaphantsi kwe-60%, yomise ngomjelo womoya oshushu kwi-130 ° C de ukufuma kube ngaphantsi kwe-5%.
I-HPMC eveliswa yindlela ye-solvent isebenzisa i-toluene kunye ne-isopropanol njenge-solvents. Ukuba ukuhlamba akulunganga, ivumba elibi liya kuhlala. Okwangoku, umgangatho we-hydroxypropyl methylcellulose yasekhaya i-HPMC iyahluka kakhulu, kwaye ixabiso liyahluka ngokubanzi, okwenza kube nzima kubathengi ukuba benze ukhetho olufanelekileyo. Le yinkinga yenkqubo yokuhlamba, ayichaphazeli ukusetyenziswa kwaye akukho ngxaki, i-HPMC ecocekileyo ayifanele ivumba i-ammonia, isitashi kunye notywala; UkrexezileyoHPMCunokujoja zonke iintlobo zamavumba, nokuba akanancasa, uya kuva ubunzima. Nangona kunjalo, i-hydroxypropyl methylcellulose eveliswa ngabavelisi abaninzi inevumba elibukhali kunye nevumba elibi. Umgangatho ngokuqinisekileyo awukho kwinqanaba.
I-Hypromellose ifumaneka ngokufaka umqhaphu osulungekisiweyo kunye nolwelo olunqabileyo lokufumana i-alkaline cellulose, emva koko yongeza i-solvent, i-etherification agent, i-toluene, kunye ne-isopropanol ye-etherification reaction, i-neutraizing ukuhlamba, ukomisa, ukutyumza, njl. ukufumana iimveliso ezigqityiweyo. Ewe, kuya kubakho iphunga, ngoko abasebenzisi banokuyisebenzisa ngokuzithemba.
Ixesha lokuposa: Apr-25-2024