He aha nga paanga o te rahi o te kakara ki te hydroxypropyl methylcellulose:
Te whakahiato ohydroxypropyl methylcellulose: Tuhia te miro miro cellulose ki te rei i te 35-40°C mo te hawhe haora, pehia, kuru te cellulose, me te tau tika ki te 35°C, kia noho te tohu toharite o te polymerization o te kawakore i roto i nga muka awhe e hiahiatia ana i roto. 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 hei whakawhānui ake i te rōrahi. Whakakore wai ki roto i te centrifuge. Horoi ki te wai kia kore noa. Mena he iti ake te makuku o te rauemi i te 60%, whakamarokehia ki te rere hau wera i te 130°C tae noa ki te iti iho o te makuku 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 horoi, ka mau tonu etahi haunga. I tenei wa, he rereke te kounga o te HPMC hydroxypropyl methylcellulose o te kainga, he rereke te utu, he uaua ki nga kaihoko te whiriwhiri tika. Koinei te raruraru o te tukanga horoi, kaore e pa ki te whakamahinga me te kore he raruraru, kaua te HPMC parakore e hongi i te haukini, te maaka me te waipiro; Kua puremuHPMChe maha nga wa ka hongi i nga momo kakara katoa, ahakoa karekau, ka taumaha. Heoi, ko te hydroxypropyl methylcellulose i hangaia e te maha o nga kaihanga he tino kaha te hongi me te hongi. Ko te kounga kaore e eke ki runga.
Ka whiwhihia te Hypromellose ma te whakauru i te miro parakore me te wai onge kia whiwhi cellulose kawakore, katahi ka taapirihia te whakarewa, te kaihoko whakaetere, te toluene, me te isopropanol mo te tauhohenga whakaeera, te whakakore i te horoi, te whakamaroke, te kuru, me etahi atu hei whiwhi hua kua oti. Ana, ka puta he kakara, ka taea e nga kaiwhakamahi te whakamahi ma te maia.
Te wa tuku: Apr-25-2024