Auduga mai ladabi—buɗewa—alkalization—etherification—neutralization — rabuwa—wanka—raɓawa— bushewa — murƙushewa — marufi — buɗe samfurin HPMC: An buɗe auduga mai ladabi don cire baƙin ƙarfe sannan a niƙa. Auduga mai ladabi da aka niƙa yana cikin nau'i na foda, tare da girman barbashi na raga 80 da watsawa na 100%. In ba haka ba, yana da sauƙi don haɗuwa tare yayin aiwatar da amsawa kuma rage ƙimar etherification.
Alkalization: Sai a zuba auduga mai laushi bayan an bude auduga zuwa wani abu mara kyau, sannan a kunna shi da alkali da ruwa mai laushi don kumbura tsinken auduga mai ladabi don sauƙaƙe shigar da kwayoyin cutar etherification da kuma inganta daidaituwar halayen etherification. Alkali da ake amfani da shi don alkalization shine ƙarfe hydroxide ko kuma alkali na halitta. Adadin alkali da aka ƙara (ta taro, iri ɗaya a ƙasa) shine sau 0.1-0.6 na auduga mai ladabi, adadin ruwa mai laushi da aka ƙara shine sau 0.3-1.0 na auduga mai ladabi; Ƙunƙarar rashin ƙarfi shine cakuda barasa da hydrocarbon, kuma adadin ƙarancin ƙarancin da aka ƙara shine sau 0.3-1.0 na auduga mai ladabi. 7-15 sau na cewa: The inert ƙarfi kuma iya zama barasa tare da 3-5 carbon atom (kamar barasa, propanol), acetone. Yana kuma iya zama aliphatic hydrocarbons da aromatic hydrocarbons; ya kamata a sarrafa zafin jiki a cikin 0-35 ° C yayin alkalization; lokacin alkalization yana kusan 1hr. Ana iya ƙayyade daidaitawar zafin jiki da lokaci bisa ga buƙatun abu da samfur.
Etherification: Bayan maganin alkalization, a ƙarƙashin yanayi mara kyau, ana ƙara wakili na etherification don etherification, kuma wakili na etherification shine propylene oxide. Don rage yawan amfani da wakili na etherification, a lokacin aikin etherification, ana ƙara wakili a cikin sau biyu, adadin adadin farko shine sau 1-3.5 na auduga mai ladabi, kuma jimlar adadin abubuwan da aka tara shine 1.5. - sau 4 na auduga mai ladabi. sau. Bayan ƙara etherifying wakili a karon farko, motsa a ≤30 ° C na 45min-90min, sa'an nan kuma tada zafin jiki zuwa 50-100 ° C don etherification na 1-5h, sa'an nan kwantar da hankali zuwa ≤30 ° C , karo na biyu. don ƙara etherification motsawa, lokacin motsawa shine 30-120min, sannan mai tsanani zuwa? ? ? Yi etherification, lokacin shine 1-4h, a wannan lokacin, auduga mai ladabi yana amsawa tare da wakilin etherification don samar da hYDROXYPROPYL METHYLCELLULLOSE HPMC.
Crushing da marufi: murkushe da sieving da busasshen samfurin na yanzu sabon, da barbashi size na HPMC samfurin na yanzu sabon abu bayan murkushe da sieving ne 40 raga da kuma watsawa ne 10096, ko bisa ga mai amfani bukatun. Sannan shirya HPMC.
Lokacin aikawa: Nuwamba-24-2022