I-Hydroxypropyl methyl cellulose, uyazi?

1.I-HPMCihlukaniswe yaba uhlobo olusheshayo kanye nohlobo lokuhlakazeka okusheshayo.

Uhlobo lokuhlakazeka okusheshayo lwe-HPMC lufakwe uhlamvu S, futhi i-glyoxal kufanele yengezwe ngesikhathi senqubo yokukhiqiza.

Uhlobo olusheshayo lwe-HPMC alungezi noma yiziphi izinhlamvu, njengokuthi “100000″ kusho ukuthi “100000 viscosity.

2. Nge-S noma ngaphandle kwayo, izici zihlukile

I-HPMC ehlakaza ngokushesha ihlakazeka ngokushesha lapho ihlangana namanzi abandayo bese inyamalala emanzini. Ngalesi sikhathi, uketshezi alunayo i-viscosity, ngoba i-HPMC ihlakazeka emanzini ngaphandle kokuhlakazeka kwangempela. Ngemva kwemizuzu engaba mibili, i-viscosity yoketshezi ikhula kancane kancane, yakha i-viscous esobala e-Thick colloid.

I-HPMC esheshayo ingahlakazwa ngokushesha emanzini ashisayo cishe ku-70°C. Lapho izinga lokushisa lehla lifinyelela ezingeni elithile lokushisa, i-viscosity izovela kancane kuze kube yilapho i-viscous colloid esobala yakheka.

3.Nge-S noma ngaphandle kwayo, inhloso ihlukile

I-HPMC esheshayo ingasetshenziswa kuphela ku-putty powder nodaka. Ku-glue ye-liquid, upende kanye nemikhiqizo yokuwasha, kuzoba ne-grouping phenomenon futhi ayikwazi ukusetshenziswa.

Ihlakazeke ngokusheshaI-HPMCinezinhlobonhlobo zezicelo futhi ingasetshenziswa ku-putty powder, udaka, iglue ewuketshezi, upende, nemikhiqizo yokuwasha ngaphandle kokuphikiswa.

4.Indlela yokuhlakaza

4-1. Thatha inani elidingekayo lamanzi ashisayo, ulifake esitsheni bese usishisa libe ngaphezu kuka-80°C, bese wengeza kancane kancane lo mkhiqizo ngaphansi kokunyakaziswa kancane. I-cellulose intanta phezu kwamanzi ekuqaleni, kodwa kancane kancane ihlakazeka ukuze yenze udaka olufanayo. Isixazululo sipholile ngenkathi sinyakaza.

4-2. Ngaphandle kwalokho, shisisa u-1/3 noma u-2/3 wamanzi ashisayo abe ngaphezu kuka-85°C, engeza i-cellulose ukuze uthole i-slurry yamanzi ashisayo, bese ufaka inani elisele lamanzi abandayo, qhubeka ugoqa, futhi upholise ingxube ewumphumela.

4-3. Imeshi ye-cellulose ilungile uma kuqhathaniswa, futhi ikhona njengezinhlayiya ezincane kumpushana ogoqiwe ngokulinganayo, futhi incibilika ngokushesha lapho ihlangana namanzi ukuze yakhe i-viscosity edingekayo.

4-4. Kancane kancane futhi ngokulinganayo wengeze i-cellulose ekamelweni lokushisa, futhi qhubeka ugoqa kuze kube yilapho kwakheka isixazululo esisobala.

5. Yiziphi izici ezithinta ukugcinwa kwamanzi kwe-hydroxypropyl methyl cellulose?

5-1. I-Cellulose ether HPMC homogeneity

I-HPMC esabela ngokulinganayo, i-methoxyl ne-hydroxypropoxyl isatshalaliswa ngokulinganayo, futhi izinga lokugcinwa kwamanzi liphezulu.

5-2. I-Cellulose ether HPMC izinga lokushisa elishisayo lejeli

Lapho izinga lokushisa lejeli elishisayo liphakeme, izinga lokugcinwa kwamanzi liphakeme; uma kungenjalo, izinga lokugcinwa kwamanzi liphansi.

5-3. I-Cellulose Ether HPMC Viscosity

Lapho i-viscosity ye-HPMC ikhula, izinga lokugcinwa kwamanzi liyanda; lapho i-viscosity ifinyelela ezingeni elithile, ukwanda kwezinga lokugcinwa kwamanzi kuvame ukuba mnene.

6.Inani elengeziwe le-cellulose ether HPMC

Inani elikhulu le-cellulose etherI-HPMCkwengezwe, izinga lokugcinwa kwamanzi liphakeme futhi kuba ngcono nomphumela wokugcina amanzi.

Ebangeni lika-0.25-0.6%, izinga lokugcinwa kwamanzi likhuphuke ngokushesha ngokunyuka kwenani elingeziwe; lapho inani elingeziwe likhuphuka, inkambiso yokwenyuka kwezinga lokugcina amanzi yehla.