He aha ngā pānga o te rahi o te kakara ki te hydroxypropyl methylcellulose:
Te Hanganga ohydroxypropyl methylcellulose: Whakamahia te miro cellulose kua oti te whakapai ki te rai i te 35-40°C mō te hawhe haora, pēhia, kuruhia te cellulose, ka pakeke tika i te 35°C, kia noho te toharite o te polymerization o te alkali i whiwhi i roto i te awhe e hiahiatia ana o ngā muka. Tāpirihia te muka alkali ki roto i te ipu etherification, tāpirihia te propylene oxide me te methyl chloride i te raupapa, ka etherify i te 50-80°C mō te 5 haora, ko te pēhanga mōrahi he tata ki te 1.8MPa. Kātahi ka tāpirihia he nui e tika ana o te waikawa hydrochloric me te waikawa oxalic ki te wai wera i te 90°C hei horoi i te rauemi kia whānui ake te rōrahi. Whakamarokehia i roto i te centrifuge. Horoia ki te wai kia kore e pā. Ina iti iho te ihirangi makuku o te rauemi i te 60%, whakamarokehia ki te rere hau wera i te 130°C kia iti iho te ihirangi makuku i te 5%.
Ko te HPMC i hangaia mā te tikanga whakarewa e whakamahi ana i te toluene me te isopropanol hei whakarewa. Mēnā kāore i te pai te horoinga, ka toe tonu he haunga ngoikore. I tēnei wā, he rerekē te kounga o te HPMC hydroxypropyl methylcellulose o te whare, ā, he rerekē hoki te utu, he uaua ki ngā kaihoko te whiriwhiri tika. Koinei te raruraru o te tukanga horoi, kāore e pā ki te whakamahinga, ā, kāore he raruraru, kaua te HPMC parakore e hongi i te haukini, te māngaro me te waipiro; Kua whakaranua.HPMCHe maha ngā wā ka hongi i ngā momo kakara katoa, ahakoa kāore he reka, ka taumaha tonu. Heoi, he tino kaha te kakara o te hydroxypropyl methylcellulose i hangaia e te tini o ngā kaihanga, ā, he haunga kanga hoki. Kāore te kounga i te rite ki te paerewa.
Ka whiwhihia te hypromellose mā te whakakī i te miro kua oti te whakapai ki te wai onge hei hanga i te cellulose kawakore, kātahi ka tāpirihia he whakarewa, he kaihoko etherification, he toluene, me te isopropanol hei tauhohenga etherification, hei horoi whakakore, hei whakamaroke, hei kuru, hei hanga i ngā hua kua oti. Āe, ka puta he kakara, kia taea ai e ngā kaiwhakamahi te whakamahi me te maia.
Wā tuku: Paenga-whāwhā-25-2024