Ungawuthola kanjani umlotha we-hydroxypropyl methylcellulose?

Okuqukethwe komlotha kuyinkomba ebalulekile yei-hydroxypropyl methylcellulose. Amakhasimende amaningi avame ukubuza lapho eqonda i-hydroxypropyl methylcellulose: liyini inani lomlotha? IHydroxypropyl methylcellulose enokuqukethwe komlotha omncane kusho ukuhlanzeka okuphezulu; i-cellulose enokuqukethwe komlotha omkhulu kusho ukuthi kukhona ukungcola okuningi kuyo, okuzothinta umphumela wokusetshenziswa noma ukwandisa inani lokwengeza. Lapho amakhasimende ekhetha i-hydroxypropyl methylcellulose, ngokuvamile akhanyisa ngokuqondile enye i-cellulose ngomlilo futhi ayishise ukuze ahlole okuqukethwe komlotha ku-cellulose. Kodwa le ndlela yokuthola ayihambisani neze nesayensi, ngoba abakhiqizi abaningi bengeza ama-accelerants omlilo ku-cellulose. Phezulu, i-cellulose inomlotha omncane kakhulu ngemva kokushiswa, kodwa empeleni, ukugcinwa kwamanzi kwe-hydroxypropyl methylcellulose akukuhle kakhulu.

Ngakho-ke kufanele sikuthole kanjani kahle okuqukethwe komlotha we-hydroxypropyl methylcellulose? Indlela elungile yokuthola iwukusebenzisa isithando somlilo se-muffle ukuthola.

I-Instrument Analytical balance, ukushisa okuphezulu kwesithando somlilo, isithando somlilo sikagesi.

Inqubo yokuhlola:

1) Okokuqala, faka i-30ml ye-porcelain crucible esithandweni se-muffle esiphezulu futhi usishise ku-(500 ~ 600) ° C imizuzu engu-30, vala isango lesithando somlilo ukuze unciphise izinga lokushisa esithandweni libe ngaphansi kuka-200 ° C, bese uthatha. khipha i-crucible bese uyihambisa ku-desiccator ukuze iphole (20~30) min, inesisindo.

2) Isisindo 1.0 g wei-hydroxypropyl methylcellulosebhalansi yokuhlaziya, faka isampula esikalini ebhodweni, bese ubeka i-crucible equkethe isampula esithandweni sikagesi se-carbonization, epholile kuya ekamelweni lokushisa, engeza i-sulfuric acid (0.5-1.0) ml, futhi uyibeke esithandweni sikagesi i-carbonization ephelele. Bese udlulela esithandweni se-muffle esishisayo, sishise ku-(500 ~ 600) ℃ ihora elingu-1, cisha amandla esithandweni se-muffle esishisayo, lapho izinga lokushisa lomlilo lehla ngaphansi kwama-200 ℃, likhiphe bese ulifaka ku-desiccator. ukupholisa (20~30) amaminithi, bese kukalwa ngebhalansi yokuhlaziya.

Ukubala Izinsalela zokubasa zibalwa ngokwefomula (3):

m2-m1

Izinsalela zokubasa (%) = ×100…………………………(3)

m

Kufomula: m1 - ubukhulu be-crucible engenalutho, ngo-g;

m2 - inqwaba yezinsalela kanye ne-crucible, ngo-g;

m – ubukhulu besampula, ngo-g.