Ta yaya warin hydroxypropyl methylcellulose (HPMC) ke shafar inganci?

Yadda za a ƙayyade ingancin hydroxypropyl methylcellulose (HPMC) tambaya ce da yawancin abokan ciniki da abokai suka fi damuwa da su. A yau, Xinhe Shanda Cellulose ya taƙaita yadda za a yi la'akari da ingancin hydroxypropyl methylcellulose (HPMC) Yin la'akari da ingancin samfurin:

Da farko, muna bukatar mu fahimci tsarin samar da hydroxypropyl methylcellulose:

Hydroxypropyl methylcellulose, kuma aka sani da hypromellose dacellulose hydroxypropyl methyl ether, An yi shi da cellulose mai tsabta mai tsabta a matsayin kayan albarkatun kasa, wanda aka sanya shi musamman a ƙarƙashin yanayin alkaline.

Haɗin hydroxypropyl methylcellulose: bi da cellulose mai ladabi mai ladabi tare da lemun tsami a 35-40 ° C na rabin sa'a, danna shi, murkushe cellulose, da kuma tsufa da kyau a 35 ° C don yin matsakaicin digiri na polymerization na alkali da aka samu. fiber a cikin kewayon da ake so. Saka alkali fiber a cikin kettle etherification, ƙara propylene oxide da methyl chloride a jere, kuma etherify a 50-80 ° C na 5 hours, matsakaicin matsa lamba ne game da 1.8MPa. Sa'an nan kuma ƙara daidai adadin hydrochloric acid da oxalic acid zuwa ruwan zafi a 90 ° C don wanke kayan don faɗaɗa ƙarar. Dehydrate a cikin centrifuge. Yi wanka har sai tsaka tsaki, kuma lokacin da abun ciki na ruwa a cikin kayan ya kasance ƙasa da 60%, bushe shi tare da iska mai zafi a 130 ° C zuwa abun ciki na ƙasa da 5%.

The HPMC samar da sauran ƙarfi hanya amfani da toluene da isopropanol a matsayin kaushi. Idan wankan bai yi kyau ba, za a sami ɗan wari mara daɗi. Wannan matsala ce ta hanyar wanke-wanke, kuma baya shafar amfani kuma babu matsala, amma a zahiri Hydroxypropyl methylcellulose da masana'antun da yawa ke samarwa yana da ƙamshi mai ƙarfi musamman da ƙamshi. Tabbas ingancin wannan nau'in bai kai matsayin ba.

Hypromellose yana da auduga mai ladabi wanda aka sanya shi tare da ruwa mai wuya don samun cellulose na alkaline, sannan ƙara ƙarfi, wakili na etherification, toluene, da isopropanol don amsawar etherification, kuma samun samfurin da aka gama bayan neutralization, wankewa, bushewa, da murkushewa. Ba shi da kyau, zai yi wari, don haka masu amfani za su iya amfani da shi tare da amincewa.