He tohu nui te nui o te pungarehuhydroxypropyl methylcelluloseHe maha ngā kaihoko e pātai ana ina mārama ana rātou ki te hydroxypropyl methylcellulose: he aha te uara o te pungarehu? Ko te hydroxypropyl methylcellulose he iti te pungarehu he tikanga he parakore ake; ko te cellulose he nui te pungarehu he tikanga he maha ngā poke kei roto, ka pā ki te pānga whakamahinga, ka piki ake rānei te nui o te tāpiri. Ina whiriwhiria e ngā kaihoko te hydroxypropyl methylcellulose, he maha ngā wā ka tahuna tika e rātou ētahi cellulose ki te ahi ka tahuna hei whakamātautau i te nui o te pungarehu o te cellulose. Engari he tino kore pūtaiao tēnei tikanga kimi, nā te mea he maha ngā kaihanga e tāpiri ana i ngā whakaterenga mura ki te cellulose. I runga i te mata, he iti noa te pungarehu o te cellulose i muri i te tahunga, engari i roto i te mahi, kāore i te tino pai te pupuri wai o te hydroxypropyl methylcellulose.
Nā, me pēhea te kimi tika i te nui o te pungarehu o te hydroxypropyl methylcellulose? Ko te tikanga kimi tika ko te whakamahi i te oumu whakamahana hei kimi.
Taputapu Taurite tātari, oumu whakamahana pāmahana teitei, oumu hiko.
Te tukanga whakamātautau:
1) Tuatahi, whakatakotoria he oko para porcelain 30ml ki roto i te oumu whakamahana-teitei, ka tahu ki te (500~600) °C mō te 30 meneti, katia te kuaha o te oumu hei whakaheke i te pāmahana o te oumu ki raro iho i te 200°C, kātahi ka tangohia te oko ka nekehia ki roto i te whakamaroke hei whakamatao (20~30) meneti, me te paunatia.
2) Taumahahia kia 1.0 karamu ohydroxypropyl methylcelluloseI runga i te pauna tātari, whakatakotoria te tauira kua paunatia ki roto i te oko whakarewa, kātahi ka whakatakotoria te oko kei roto te tauira ki runga i te oumu hiko hei whakawaro, whakamatao ki te pāmahana rūma, tāpirihia te waikawa whanariki (0.5-1.0) ml, ka whakatakotoria ki runga i te oumu hiko kia whakawaro katoatia. Kātahi ka nekehia ki te oumu whakamahana pāmahana teitei, tahuna ki te (500~600) ℃ mō te 1 hāora, whakawetohia te hiko o te oumu whakamahana pāmahana teitei, ina heke te pāmahana o te oumu ki raro i te 200 ℃, tangohia mai ka whakatakotoria ki roto i te whakamaroke kia whakamatao (20~30) meneti, kātahi ka paunatia ki runga i te pauna tātari.
Ka tatauhia te toenga mura e ai ki te tauira (3):
m2-m1
Te toenga mura (%) = ×100………………………(3)
m
I roto i te tātai: m1 – te papatipu o te para kau, i roto i te g;
m2 – te papatipu o te toenga me te oko whakarewa, i roto i te g;
m – te papatipu o te tauira, i roto i te g.
Wā tuku: Paenga-whāwhā-25-2024