Pehea e ʻike ai i ka lehu o ka hydroxypropyl methylcellulose?

ʻO ka maʻiʻo lehu he hōʻailona koʻikoʻi ohydroxypropyl methylcellulose. Nīnau pinepine nā mea kūʻai i ka wā e hoʻomaopopo ai lākou i ka hydroxypropyl methylcellulose: he aha ka waiwai lehu? ʻO ka Hydroxypropyl methylcellulose me kahi mea lehu liʻiliʻi ʻo ia ka maʻemaʻe kiʻekiʻe; ʻO ka cellulose me ka nui o ka lehu he nui nā mea haumia i loko o ia mea, e hoʻopili i ka hopena hoʻohana a hoʻonui paha i ka nui o ka hoʻohui. Ke koho nā mea kūʻai aku i ka hydroxypropyl methylcellulose, hoʻomālamalama pinepine lākou i kekahi cellulose me ke ahi a puhi iā ia e hoʻāʻo i ka lehu o ka cellulose. Akā ʻaʻole ʻepekema kēia ʻano ʻike, no ka mea, nui nā mea hana e hoʻohui i nā accelerants combustion i ka cellulose. Ma luna o ka ʻili, he liʻiliʻi loa ka lehu o ka cellulose ma hope o ka puhi ʻana, akā i ka hoʻomaʻamaʻa, ʻaʻole maikaʻi loa ka paʻa ʻana o ka wai o ka hydroxypropyl methylcellulose.

No laila pehea mākou e ʻike pono ai i ka lehu o ka hydroxypropyl methylcellulose? ʻO ke ala ʻike kūpono ʻo ia ka hoʻohana ʻana i kahi umu muffle e ʻike ai.

Mea Hana Analytical koena, kiʻekiʻe wela muffle umu, uila umu ahi.

Kaʻina hana hoʻokolohua:

1) Mua, e kau i 30ml porcelain crucible i loko o ka wela wela muffle umu ahi a puhi ia ma (500 ~ 600) ° C no 30 minuke, e pani i ka ipu kapuahi e hoemi i ka wela o ka umu i lalo o 200 ° C, a laila e lawe aku i ka crucible a hoʻoneʻe ia i ka min, weig30 e hooluolu.

2) Kaumaha 1.0 g ohydroxypropyl methylcellulosema ke koena analytical, e kau i ka lapana i kaupaonaia i loko o ka ipu hao, a laila e kau i ka ipuhao i loko o ka hāpana ma luna o ka umu uila no ka carbonization, anuanu i ka lumi wela, e hoʻohui i ka sulfuric acid (0.5-1.0) ml, a kau ma luna o ka umu uila no ka carbonization piha. A laila e neʻe i ka umu muffle wela kiʻekiʻe, e puhi i ka (500 ~ 600) ℃ no 1 hola, e hoʻopau i ka mana o ka umu muffle wela wela, i ka wā e hāʻule ai ka mahana o ka umu ma lalo o 200 ℃, e lawe i waho a waiho i loko o ka desiccator e hoʻomaʻalili (20 ~ 30) min, a laila kaupaona ma kahi analytical kaulike.

Heluhelu ʻia ke koena hoʻāla ʻia e like me ke kumu (3):

m2-m1

Ke koena hoʻā ʻana (%) = ×100………………………………(3)

m

Ma ke ʻano: m1 – ka nuipaʻa o ke kīʻaha kaʻawale, ma g;

m2 - ka nui o ke koena a me ke kīʻaha, ma g;

m - ka nui o ka hāpana, ma g.