Inaianei he maha nga taangata kaore e tino mohio mo te hydroxypropyl starch ether.Ki ta ratou whakaaro he iti te rereketanga i waenga i te hydroxypropyl starch ether me te maaka noa, engari kaore.Ko te nui o te hydroxypropyl starch ether e whakamahia ana i roto i nga hua kumete he iti rawa, a ko te nui o te taapiri o te polar ka taea te whakatutuki i nga paanga o te kounga pai.
Ko te Hydroxypropyl starch ether (HPS) he paura pai ma i whiwhihia ma te whakarereke i nga tipu taiao, ka tino whakahiatohia, ka rehu-maroke, kaore he kirihou.He rereke rawa atu i te māngaro noa, te māngaro whakarerekē rānei.
A ko te hydroxypropyl methyl cellulose, e mohiotia ana ko hypromellose, hydroxypropyl methyl red vitamin ether, ko te whakamahi i te cellulose miro tino parakore hei rauemi mata, ka rongoa ki te rei i te 35-40 ° C mo te hawhe haora, Kohia, kuru te cellulose, a tau tika i 35°C, kia te tohu toharite o te polymerization o te muka alkali whiwhi 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, ka whakakorikori i te 50-80°C mo te 5 haora, a ko te pehanga teitei ko 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 ki te whakawhānui ake i te rōrahi, kātahi ka whakamarokehia ki te centrifuge, ka mutu ka horoi tonu kia noho kore.Ka whakamahia nuitia i roto i te hangahanga, te ahumahi matū, te peita, te rongoa, te ahumahi hoia me etahi atu mara, hei kaihoko hanga kiriata, hei here, hei whakamararatanga, hei whakapumau, hei peera, etc.
Ka taea te whakamahi i te hydroxypropyl starch ether hei whakauru mo nga hua ciment-based, hua gypsum-based me nga hua konupūmā kotakota.He pai te hototahi ki etahi atu whakaurunga whare.Ka whakamahia tahi me te hydroxypropyl methylcellulose ether HPMC, ka taea te whakaiti i te inenga o te hydroxypropyl methylcellulose (te nuinga o te taapiri 0.05% o te HPS ka taea te whakaiti i te inenga o te HPMC e pa ana ki te 20% -30%), ka taea e ia te takaro i te paanga matotoru, hei whakatairanga i te roto. te hanganga, he pai ake te aukati kapiti me te pai ake o te mahi.
Te wa tuku: Apr-24-2023