Ivumba le-hydroxypropyl methylcellulose (HPMC) liwuchaphazela njani umgangatho?

Indlela yokumisela umgangatho we-hydroxypropyl methylcellulose (HPMC) ngumbuzo oxhalabisa abathengi abaninzi kunye nabahlobo. Namhlanje, iXinhe Shanda Cellulose ishwankathela indlela yokugweba umgangatho we-hydroxypropyl methylcellulose (HPMC) Ukugweba umgangatho wemveliso:

Okokuqala, kufuneka siqonde inkqubo yokuvelisa i-hydroxypropyl methylcellulose:

IHydroxypropyl methylcellulose, eyaziwa ngokuba yi-hypromellose kunyeicellulose hydroxypropyl methyl ether, yenziwe nge-cotton cellulose ecocekileyo kakhulu njengento ekrwada, eyenziwa ngokukodwa phantsi kweemeko ze-alkaline.

I-synthesis ye-hydroxypropyl methylcellulose: phatha i-cotton cellulose ecocekileyo nge-lye kwi-35-40 ° C isiqingatha seyure, yicinezele, utyumze i-cellulose, kwaye uyiguge ngokufanelekileyo kwi-35 ° C ukwenza idigri ephakathi kwe-polymerization ye-alkali efunyenweyo. ifayibha phakathi koluhlu olufunwayo. 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 yongeza inani elifanelekileyo le-hydrochloric acid kunye ne-oxalic acid kumanzi ashushu kwi-90 ° C ukuhlamba izinto zokwandisa umthamo. Dehydrate kwicentrifuge. Geza uze ungathathi hlangothi, kwaye xa umthamo wamanzi kwizinto eziphathekayo ungaphantsi kwe-60%, uyomise ngokuhamba komoya oshushu kwi-130 ° C ukuya kumxholo ongaphantsi kwe-5%.

I-HPMC eveliswa yindlela ye-solvent isebenzisa i-toluene kunye ne-isopropanol njenge-solvents. Ukuba ukuhlanjwa akulunganga, kuya kubakho ivumba elishiyekileyo. Le yingxaki kwinkqubo yokuhlamba, kwaye ayichaphazeli ukusetyenziswa kwaye akukho ngxaki, kodwa ngokwenene I-hydroxypropyl methylcellulose eveliswa ngabavelisi abaninzi inephunga elinamandla kunye nephunga elimnandi. Umgangatho wolu hlobo ngokuqinisekileyo awukho kumgangatho.

I-Hypromellose i-cotton esulungekileyo efakwe kulwelo olunqabileyo ukufumana i-alkaline cellulose, emva koko yongeza i-solvent, i-etherification agent, i-toluene, kunye ne-isopropanol ye-etherification reaction, kwaye ufumane imveliso egqityiweyo emva kokungathathi hlangothi, ukuhlamba, ukomisa, kunye nokutyumza. Akulunganga, iya kunuka, ngoko abasebenzisi banokuyisebenzisa ngokuzithemba.