Me pehea te kite i te ihirangi pungarehu o te hydroxypropyl methylcellulose?

Ko te ihirangi pungarehu he tohu nui ohydroxypropyl methylcellulose. He maha nga kaihoko ka patai ina mohio ratou ki te hydroxypropyl methylcellulose: he aha te uara pungarehu? Ko te Hydroxypropyl methylcellulose me te iti o te pungarehu he nui ake te ma; te cellulose me te nui o te pungarehu te tikanga he maha nga poke kei roto, ka pa ki te paanga o te whakamahinga, ka piki ake ranei te nui o te taapiri. Ina whiriwhiria e nga kaihoko te hydroxypropyl methylcellulose, he maha nga wa ka tahuna e ratou etahi cellulose ki te ahi ka tahuna hei whakamatautau i te ihirangi pungarehu o te cellulose. Engari ko tenei tikanga rapunga he tino korepuiao, na te mea he maha nga kaihanga e taapiri ana i nga whakakorikori wera ki te cellulose. I runga i te mata, he iti rawa te pungarehu o te cellulose i muri i te wera, engari i roto i te mahi, kaore i te tino pai te pupuri i te wai o te hydroxypropyl methylcellulose.

Na me pehea e tika ai te kite i te kiko pungarehu o te hydroxypropyl methylcellulose? Ko te tikanga kimi tika ko te whakamahi i te oumu muffle ki te kimi.

Taputapu Taurite tātari, oumu muffle pāmahana teitei, oumu hiko.

Te tukanga whakamatautau:

1) Tuatahi, makahia he 30ml porcelain crucible ki roto i te oumu muffle teitei-te pāmahana ka tahuna ki te (500~600) °C mo te 30 meneti, kati te kuaha oumu ki te whakaheke i te pāmahana i roto i te oumu ki raro i te 200 ° C, katahi ka tango i te ipu ka nukuhia ki te desiccator kia whakamatao (20~30).

2) Paunatia te 1.0 g ohydroxypropyl methylcellulosei runga i te pauna tātari, makahia te tauira kua paunatia ki roto i te para, katahi ka tuu te ipuipu kei roto te tauira ki runga i te oumu hiko mo te warohanga, whakamatao ki te pāmahana rūma, tāpirihia te waikawa pungatara (0.5-1.0) ml, ka maka ki runga i te oumu hiko mo te warohanga katoa. Na ka neke ki te oumu muffle pāmahana teitei, tahuna i te (500~600) ℃ mo te 1 haora, whakawetohia te mana o te oumu muffle pāmahana teitei, ka taka te pāmahana oumu ki raro i te 200 ℃, tangohia ki waho ka maka ki roto i te desiccator kia whakamatao (20~30) min, ka paunatia ki runga i te taurite tātari.

Tatau Ko te toenga mura ka tatauhia i runga i te tauira (3):

m2-m1

Te toenga mura (%) = ×100………………………………(3)

m

I roto i te tātai: m1 – te papatipu o te ipu wai kau, i te g;

m2 – te papatipu o te toenga me te ipu, i te g;

m – te papatipu o te tauira, i te g.