He tokomaha te hunga kāore i te mōhio nui ki te hydroxypropyl starch ether. Ki tā rātou whakaaro he iti noa te rerekētanga i waenga i te hydroxypropyl starch ether me te māngaro noa, engari kāore. He iti noa te nui o te hydroxypropyl starch ether e whakamahia ana i roto i ngā hua moata, ā, mā te tāpiri i te nui o te polar ka taea te whakatutuki i ngā hua kounga pai.
Ko te māngaro hydroxypropyl ether (HPS) he paura ma, he kikokore, i whiwhihia mā te whakarerekē i ngā tipu tūturu, i whakapūmautia kia tino ethered, kātahi ka whakamarokehia ki te rehu, me te kore he plasticizer. He tino rerekē tēnei i te māngaro noa, i te māngaro whakarerekētia rānei.
Ā, ko te hydroxypropyl methyl cellulose, e mōhiotia ana ko te hypromellose, hydroxypropyl methyl whero huaora ether, he mea whakamahi i te miro cellulose tino parakore hei rauemi mata, ka rongoatia ki te lye 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 muka alkali i whiwhi i roto i te awhe e hiahiatia ana. Whakanohoia te muka alkali ki roto i te ipu etherification, tāpirihia te propylene oxide me te methyl chloride i roto i te raupapa, ka etherify i te 50-80°C mō te 5 haora, ā, 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, kātahi ka whakamarokehia ki te centrifuge, ā, i te mutunga ka horoia kia kore e pāngia. He whānuitia te whakamahinga i roto i te hanga, te ahumahi matū, te peita, te rongoā, te ahumahi hōia me ētahi atu mara, hei kaihoko hanga kiriata, hei here, hei whakamarara, hei whakaū, hei whakamātotoru, hei whakakaha, hei aha atu.
Ka taea te whakamahi i te māngaro hydroxypropyl ether hei ranunga mō ngā hua sima, ngā hua gypsum me ngā hua konupūmā raima. He pai te hototahi ki ētahi atu ranunga hanga whare. Ina whakamahia ngātahi me te hydroxypropyl methylcellulose ether HPMC, ka taea te whakaiti i te horopeta o te hydroxypropyl methylcellulose (mā te tāpiri i te 0.05% o te HPS ka taea te whakaiti i te horopeta o te HPMC mā te 20%-30%)), ā, ka taea te whakamātotoru, hei whakatairanga i te hanganga o roto, me te ātete pai ake ki te pakaru me te pai ake o te mahi.
Wā tuku: Paenga-whāwhā-24-2023