Ungawubona njani umxholo wothuthu lwehydroxypropyl methylcellulose?

Umxholo wothuthu luphawu olubalulekileyoihydroxypropyl methylcellulose. Abathengi abaninzi bahlala bebuza xa beqonda i-hydroxypropyl methylcellulose: yintoni ixabiso lothuthu? IHydroxypropyl methylcellulose enomxholo omncinci wothuthu ithetha ukucoceka okuphezulu; i-cellulose enomxholo omkhulu womlotha ithetha ukuba kukho ukungcola okuninzi kuyo, okuya kuchaphazela umphumo wokusetyenziswa okanye ukwandisa inani lokongezwa. Xa abathengi bekhetha i-hydroxypropyl methylcellulose, bahlala belayita ngokuthe ngqo enye i-cellulose ngomlilo kwaye bayitshise ukuvavanya umxholo wothuthu lweselulosi. Kodwa le ndlela yokufumanisa ayinanzululwazi kakhulu, kuba abaninzi abavelisi bongeza i-accelerants yokutshisa kwi-cellulose. Phezulu, i-cellulose inomlotha omncinci emva kokutshisa, kodwa ekusebenzeni, ukugcinwa kwamanzi e-hydroxypropyl methylcellulose akulungile kakhulu.

Ke kufuneka siwubone njani ngokuchanekileyo umxholo wothuthu lwe-hydroxypropyl methylcellulose? Indlela echanekileyo yokufumanisa kukusebenzisa i-muffle furnace ukukhangela.

Isixhobo Analytical balance, iqondo lobushushu eliphezulu muffle eziko, eziko lombane.

Inkqubo yovavanyo:

I-1) Okokuqala, faka i-30ml ye-porcelain crucible kwi-high-temperature muffle furnace kwaye uyitshise (500 ~ 600) ° C imizuzu engama-30, vala isango lesithando somlilo ukuze unciphise iqondo lokushisa kwi-200 ° C, emva koko uthathe. khupha i-crucible kwaye uyihambise kwi-desiccator ukupholisa (20 ~ 30) min, ukulinganisa.

2) Ubunzima 1.0 g yeihydroxypropyl methylcellulosekwibhalansi yokuhlalutya, faka isampuli esilinganisiweyo kwi-crucible, emva koko ubeke i-crucible equkethe isampuli kwisithando sombane se-carbonization, epholileyo kwiqondo lokushisa, yongeza i-asidi ye-sulfuric (0.5-1.0) ml, kwaye uyibeke kwiziko lombane ukuze i-carbonization epheleleyo. Emva koko ushukumisele kwisithando somlilo esiphezulu, utshise (500 ~ 600) ℃ ngeyure enye, cima amandla eziko lobushushu obuphezulu, xa ubushushu beziko lehla ngaphantsi kwe-200 ℃, yikhuphe kwaye uyibeke kwi-desiccator. ukupholisa (20 ~ 30) min, kwaye emva koko ulinganiswe kwibhalansi yohlalutyo.

Ukubala Intsalela yokulayita ibalwa ngokwefomula (3):

m2-m1

Intsalela yomlilo (%) = ×100…………………………(3)

m

Kwifomula: m1 - ubunzima be-crucible engenanto, kwi-g;

m2 - ubunzima bentsalela kunye ne-crucible, kwi-g;

m – ubunzima besampulu, kwi-g.