He pehea te paanga o te haunga o te hydroxypropyl methylcellulose (HPMC) ki te kounga?

Me pehea te whakatau i te kounga o te hydroxypropyl methylcellulose (HPMC) he patai kei te awangawanga te nuinga o nga kaihoko me o hoa. I tenei ra, ka whakarāpopotohia e Xinhe Shanda Cellulose me pehea te whakatau i te kounga o te hydroxypropyl methylcellulose (HPMC) Te whakatau i te kounga o te hua:

Tuatahi, me mohio tatou ki te tukanga whakaputa o te hydroxypropyl methylcellulose:

Hydroxypropyl methylcellulose, e mohiotia ana ano he hypromellose mecellulose hydroxypropyl methyl ether, he mea hanga mai i te cellulose miro tino parakore hei rauemi mata, he mea whakahiato i raro i nga tikanga kawakore.

Ko te whakahiatotanga o te hydroxypropyl methylcellulose: hamanihia te miro miro cellulose ki te rei i te 35-40°C mo te hawhe haora, pehia, kuru te cellulose, me te pakeke ki te 35°C ki te hanga i te tohu toharite o te polymerization o te alkali kua riro. muka i roto i te awhe e hiahiatia ana. Kuhua te muka kawakore ki roto i te ketere etherification, tāpirihia te propylene oxide me te methyl chloride i roto i te raupapa, me te etherify i te 50-80°C mo te 5 haora, ko te pehanga teitei kei te 1.8MPa. Kātahi ka tāpirihia te nui o te waikawa pūhaumāota me te waikawa oxalic ki te wai wera i te 90°C hei horoi i te rauemi kia nui ake te rōrahi. Whakakore wai ki roto i te centrifuge. Horoi kia kore noa, a ka iti iho te wai i roto i te rauemi i te 60%, whakamaroke ki te rere o te hau wera i te 130°C ki te iti iho i te 5%.

Ko te HPMC i hangaia e te tikanga whakarewa ka whakamahi i te toluene me te isopropanol hei whakarewa. Ki te kore e pai te horoinga, ka hongi te toenga o te kakara. He raruraru tenei mo te tukanga horoi, kaore e pa ki te whakamahinga me te kore he raruraru, engari i roto i te pono Ko te hydroxypropyl methylcellulose i hangaia e te maha o nga kaihanga he tino kaha te kakara me te kakara reka. Ko te kounga o tenei momo kaore e eke ki te paerewa.

Ko te Hypromellose he miro parakore kua whakapourihia ki te wai onge kia whiwhi cellulose kawakore, katahi ka taapirihia te whakarewa, te kaihoko etherification, te toluene, me te isopropanol mo te tauhohenga etherification, ka whiwhi i te hua kua oti i muri i te whakakore, te horoi, te whakamaroke, me te kuru. Kaore i te pai, ka hongi, ka taea e nga kaiwhakamahi te whakamahi ma te maia.