Zithini iziphumo zobungakanani bevumba kwi-hydroxypropyl methylcellulose:
Ukwenziwa kwei-hydroxypropyl methylcellulose: Phatha i-cotton cellulose ecociweyo nge-lye kwi-35-40°C kangangesiqingatha seyure, cinezela, utyumze i-cellulose, kwaye ukhule kakuhle kwi-35°C, ukuze iqondo eliqhelekileyo le-polymerization ye-alkali efunyenweyo libe ngaphakathi koluhlu olufunekayo lweefayibha ngaphakathi. Faka i-alkali fiber kwi-kettle ye-etherification, yongeza i-propylene oxide kunye ne-methyl chloride ngokulandelelana, kwaye u-etherify kwi-50-80°C iiyure ezi-5, uxinzelelo oluphezulu lumalunga ne-1.8MPa. Emva koko yongeza isixa esifanelekileyo se-hydrochloric acid kunye ne-oxalic acid emanzini ashushu kwi-90°C ukuhlamba izinto ukuze zandise umthamo. Khipha amanzi kwi-centrifuge. Hlamba ngamanzi kude kube kungathathi cala. Xa umxholo wokufuma wezinto ungaphantsi kwe-60%, yomise ngomjelo womoya oshushu kwi-130°C ude umxholo wokufuma ungaphantsi kwe-5%.
I-HPMC eveliswa yindlela yokunyibilikisa isebenzisa i-toluene kunye ne-isopropanol njengezinyibilikisi. Ukuba ukuhlamba akulunganga, ivumba elincinci liya kuhlala likho. Okwangoku, umgangatho we-hydroxypropyl methylcellulose yasekhaya i-HPMC uyahluka kakhulu, kwaye ixabiso liyahluka kakhulu, okwenza kube nzima kubathengi ukwenza ukhetho olufanelekileyo. Le yingxaki yenkqubo yokuhlamba, ayichaphazeli ukusetyenziswa kwaye akukho ngxaki, i-HPMC ecocekileyo ayifanele ivumba i-ammonia, istatshi kunye notywala;I-HPMCidla ngokuvumba zonke iintlobo zevumba, nokuba ayinancasa, iya kuziva inzima. Nangona kunjalo, i-hydroxypropyl methylcellulose eveliswa ngabavelisi abaninzi inevumba elinamandla kakhulu kunye nevumba elibi. Umgangatho ngokuqinisekileyo awukho kumgangatho ophezulu.
IHypromellose ifunyanwa ngokufunxa umqhaphu ocociweyo ngolwelo olunqabileyo ukuze kufunyanwe i-alkaline cellulose, emva koko kongezwe i-solvent, i-etherification agent, i-toluene, kunye ne-isopropanol ukuze kusetyenziswe i-etherification reaction, kuncitshiswe ukuhlamba, komiswe, kutyunyuzwe, njl.njl. ukuze kufunyanwe iimveliso ezigqityiweyo. Kaloku, kuya kubakho ivumba elimnandi, ukuze abasebenzisi bayisebenzise ngokuzithemba.
Ixesha leposi: Epreli-25-2024