MC shine methyl cellulose, wanda aka yi shi da cellulose ether ta hanyar magance auduga mai tsafta da alkali, amfani da methane chloride a matsayin wakilin etherification, da kuma yin jerin halayen. Gabaɗaya, matakin maye gurbin shine 1.6~2.0, kuma narkewar shi ma ya bambanta da matakan maye gurbin daban-daban. Yana cikin cellulose ether wanda ba ionic ba.
(1) Rikewar ruwa na methyl cellulose ya dogara da adadin ƙarinsa, ɗanko, ɗanko na barbashi da kuma yawan narkewar sa. Gabaɗaya, idan adadin ƙarin ya yi yawa, ɗanko yana da ƙarami, kuma ɗanko yana da girma, ƙimar riƙe ruwa yana da yawa. Daga cikinsu, adadin ƙarin yana da babban tasiri akan ƙimar riƙe ruwa, kuma matakin ɗanko ba ya daidai da matakin riƙe ruwa kai tsaye. Yawan narkewar ya dogara ne akan matakin gyaran saman barbashi na cellulose da ɗanko na barbashi. Daga cikin ƙwayoyin cellulose da ke sama, methyl cellulose da hydroxypropyl methyl cellulose suna da ƙarin yawan riƙe ruwa.
(2) Methylcellulose yana narkewa a cikin ruwan sanyi, kuma zai yi wuya a narke a cikin ruwan zafi. Maganin ruwansa yana da ƙarfi sosai a cikin kewayon pH = 3 ~ 12. Yana da kyakkyawan jituwa da sitaci, guar gum, da sauransu da yawa. Lokacin da zafin jiki ya kai zafin gelation, gelation yana faruwa.
(3) Sauye-sauye a yanayin zafi zai yi tasiri sosai ga yawan riƙe ruwa na methyl cellulose. Gabaɗaya, idan yawan zafin ya yi yawa, to, riƙe ruwa ya fi muni. Idan zafin turmi ya wuce 40°C, riƙe ruwa na methyl cellulose zai ragu sosai, wanda hakan zai shafi ginin turmi sosai.
(4) Methyl cellulose yana da tasiri mai mahimmanci akan ginawa da mannewa na turmi. "Mannewa" a nan yana nufin ƙarfin manne da aka ji tsakanin kayan aikin mai amfani da ma'aikacin da kuma abin da ke kan bango, wato, juriyar yanke turmi. Mannewa yana da girma, juriyar yanke turmi yana da girma, kuma ƙarfin da ma'aikata ke buƙata yayin amfani shi ma yana da girma, kuma aikin ginin turmi ba shi da kyau. Mannewar methyl cellulose yana da matsakaicin matsayi a cikin samfuran cellulose ether.
HPMC hydroxypropyl methylcellulose ne, wanda wani gauraye ne na cellulose wanda ba ionic ba wanda aka yi daga auduga mai tsafta bayan an yi alkali, ana amfani da propylene oxide da methyl chloride a matsayin sinadaran etherification, kuma ta hanyar jerin halayen. Matsayin maye gurbin gabaɗaya shine 1.2~2.0. Halayensa sun bambanta saboda bambancin rabo na abun ciki na methoxyl da abun ciki na hydroxypropyl.
(1) Hydroxypropyl methylcellulose yana narkewa cikin sauƙi a cikin ruwan sanyi, kuma zai fuskanci matsaloli wajen narkewa a cikin ruwan zafi. Amma zafin gelation ɗinsa a cikin ruwan zafi ya fi na methyl cellulose girma sosai. Hakanan yana inganta narkewa a cikin ruwan sanyi sosai idan aka kwatanta da methyl cellulose.
(2) Dankowar hydroxypropyl methylcellulose yana da alaƙa da nauyin kwayoyin halittarsa, kuma girman nauyin kwayoyin halittar, haka nan girman dankowar. Zafin jiki kuma yana shafar dankowar sa, yayin da zafin jiki ke ƙaruwa, dankowar yana raguwa. Duk da haka, babban dankowar sa yana da ƙarancin tasirin zafin jiki fiye da methyl cellulose. Maganin sa yana da karko idan aka adana shi a zafin jiki na ɗaki.
(3) Hydroxypropyl methylcellulose yana da daidaito ga acid da alkali, kuma ruwan da ke cikinsa yana da daidaito sosai a cikin kewayon pH = 2 ~ 12. Soda mai kauri da ruwan lemun tsami ba su da tasiri sosai kan aikinsu, amma alkali na iya hanzarta narkewarsa da ƙara dankonsa. Hydroxypropyl methylcellulose yana da daidaito ga gishirin da aka saba da shi, amma idan yawan ruwan gishiri ya yi yawa, danko na ruwan hydroxypropyl methylcellulose yana ƙaruwa.
(4) Rikewar ruwa na hydroxypropyl methylcellulose ya dogara da adadin ƙarinsa, dankonsa, da sauransu, kuma yawan riƙewar ruwa a ƙarƙashin adadin ƙarin ya fi na methyl cellulose girma.
(5) Ana iya haɗa Hydroxypropyl methylcellulose da mahaɗan polymer masu narkewa cikin ruwa don samar da mafita mai kama da juna kuma mafi girma. Kamar polyvinyl alcohol, sitaci ether, kayan lambu, da sauransu.
(6) Mannewar hydroxypropyl methylcellulose ga ginin turmi ya fi na methylcellulose girma.
(7) Hydroxypropyl methylcellulose yana da juriya ga enzyme fiye da methylcellulose, kuma maganin sa ba shi da yuwuwar lalacewa ta hanyar enzymes fiye da methylcellulose.
Lokacin Saƙo: Afrilu-17-2023