Hanyar roba ta hydroxypropyl methylcellulose

Gabaɗaya, a cikin haɗakarhydroxypropyl methylcellulose, ana yi wa auduga cellulose mai kyau magani da maganin alkali a 35-40°C na rabin sa'a, a matse, a niƙa cellulose ɗin, sannan a dasa shi yadda ya kamata a 35°C, don haka zaruruwan alkali da aka samu su kasance masu matsakaicin ƙarfin polymerized a cikin kewayon da ake buƙata. Sanya zaren alkali a cikin kettle ɗin etherification, a ƙara propylene oxide da methyl chloride a jere, sannan a tace a 50-80 ℃ na tsawon awanni 5 zuwa matsin lamba mai yawa na kusan 1.8 MPa. Sannan a ƙara adadin hydrochloric acid da oxalic acid a cikin ruwan zafi a 90°C don wanke kayan don faɗaɗa ƙarar. A jika shi da centrifuge. A wanke har sai ya yi tsaka tsaki, lokacin da ruwan da ke cikin kayan ya ƙasa da kashi 60%, a busar da shi da iska mai zafi a 130°C zuwa ƙasa da kashi 5%.

Alkalancin: Ana ƙara audugar da aka tace da foda bayan buɗewa a cikin wani sinadari mai narkewa mara aiki, sannan a kunna ta da alkali da ruwa mai laushi don kumbura layin lu'ulu'u na audugar da aka tace, wanda ke taimakawa wajen shigar ƙwayoyin sinadarai masu samar da etherifying kuma yana inganta daidaiton amsawar etherification. Alkalin da ake amfani da shi a cikin alkalancin shine hydroxide na ƙarfe ko tushe na halitta. Adadin alkali da aka ƙara (ta hanyar taro, iri ɗaya a ƙasa) ya ninka na audugar da aka tace sau 0.1-0.6, kuma adadin ruwan laushi ya ninka na audugar da aka tace sau 0.3-1.0; sinadarin da ba shi da ert cakuda ne na barasa da hydrocarbon, kuma adadin sinadarin da ba shi da ert da aka ƙara shine audugar da aka tace. Sau 7-15: sinadarin da ba shi da ert kuma zai iya zama barasa mai atom 3-5 na carbon (kamar barasa, propanol), acetone. Hakanan yana iya zama hydrocarbons na aliphatic da hydrocarbons masu ƙanshi; ya kamata a sarrafa zafin jiki a cikin 0-35°C yayin alkalancin; lokacin alkalancin yana kusan awa 1. Ana iya ƙayyade daidaitawar zafin jiki da lokaci bisa ga buƙatun kayan da samfurin.

Etherification: Bayan maganin alkali, a ƙarƙashin yanayin injin, ana yin etherification ta hanyar ƙara etherifying, kuma etherifying shine propylene oxide. Domin rage yawan amfani da etherifying, an ƙara etherifying sau biyu a lokacin aikin etherification.