MC shine methyl cellulose, wanda ake samu ta hanyar magance auduga mai tsafta da alkali, amfani da methyl chloride a matsayin wakili mai tsarkakewa, da kuma yin cellulose ether ta hanyar jerin halayen. Gabaɗaya, matakin maye gurbin shine 1.6~2.0, kuma narkewar shi ma ya bambanta da matakan maye gurbin daban-daban. Ya kasance ga cellulose ether mara ionic.
(1) Rike ruwa namethyl celluloseya dogara da adadin ƙarinsa, ɗanko, ɗanko da kuma yawan narkewar sa. Gabaɗaya, idan adadin ƙarin ya yi yawa, ɗanko kaɗan ne, kuma ɗanko ya yi yawa, ƙimar riƙe ruwa yana da yawa. Daga cikinsu, adadin ƙarin yana da babban tasiri akan ƙimar riƙe ruwa, kuma matakin ɗanko bai yi daidai da matakin riƙe ruwa ba. Yawan narkewar ya dogara ne akan matakin gyaran saman ƙwayoyin cellulose da kuma ɗanko na ƙwayoyin. 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, amma yana da wahalar narkewa a cikin ruwan zafi, kuma ruwan da ke cikinsa yana da ƙarfi sosai a cikin kewayon pH = 3 ~ 12. Yana da kyakkyawan jituwa da sitaci, guar gum, da sauransu da kuma yawancin surfactants. Lokacin da zafin jiki ya kai zafin gelation, abin da ke faruwa na gelation yana faruwa.
(3) Sauyin zafin jiki zai yi tasiri sosai ga yawan riƙe ruwa na methyl cellulose. Gabaɗaya, mafi girman zafin jiki, haka nan riƙon ruwa ke ƙara muni. Idan zafin turmi ya wuce 40 °C, riƙon ruwan methyl cellulose zai yi muni sosai, wanda zai yi tasiri sosai ga iya aiki na turmi.
(4) Methyl cellulose yana da tasiri mai mahimmanci akan iya aiki da mannewa na turmi. "Mannewa" a nan yana nufin mannewa 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 a tsarin amfani shi ma yana da girma, kuma gina turmi ba shi da kyau. Mannewar Methylcellulose yana da matsakaicin matsayi a cikin samfuran cellulose ether.
HPMC hydroxypropyl methyl cellulose ne, wanda wani gauraye ne na cellulose wanda ba ionic ba wanda aka yi da auduga mai tsafta bayan maganin alkali, ta amfani da propylene oxide da methyl chloride a matsayin masu samar da etherifying, kuma ta hanyar jerin halayen. Matsayin maye gurbin gabaɗaya shine 1.2 zuwa 2.0. Halayensa sun bambanta dangane da rabon abun ciki na methoxyl da abun ciki na hydroxypropyl.
(1) Hydroxypropyl methylcellulose yana narkewa cikin ruwan sanyi cikin sauƙi, amma zai fuskanci matsaloli wajen narkewa a cikin ruwan zafi. Amma zafin gelation ɗinsa a cikin ruwan zafi ya fi na methyl cellulose girma sosai. Narkewar a cikin ruwan sanyi kuma yana da kyau sosai idan aka kwatanta da methyl cellulose.
(2) Dankowar hydroxypropyl methylcellulose yana da alaƙa da girman 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. Amma dankowar sa ba ta da tasiri sosai fiye da methyl cellulose. Maganin sa yana da karko a adana shi a zafin 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 narkewar sa da kuma ƙara danko. Hydroxypropyl methylcellulose yana da daidaito ga gishirin da aka saba da shi, amma idan yawan ruwan gishirin ya yi yawa, dankowar ruwan hydroxypropyl methylcellulose yana ƙaruwa.
(4) Rike ruwa nahydroxypropyl methylcelluloseya dogara da adadin ƙarinsa, dankonsa, da sauransu. Yawan riƙe ruwa a ƙarƙashin adadin ƙarin ya fi na methyl cellulose.
(5) Ana iya haɗa Hydroxypropyl methylcellulose da mahaɗan polymer masu narkewa cikin ruwa don samar da mafita mai kama da juna da kuma ɗanko mai yawa. Kamar polyvinyl alcohol, sitaci ether, man shanu na kayan lambu, da sauransu.
(6) Mannewar hydroxypropyl methylcellulose ga ginin turmi ya fi na methylcellulose girma.
(7) Hydroxypropyl methylcellulose yana da juriya ga enzymes mafi kyau fiye da methylcellulose, kuma yiwuwar lalacewar enzymatic na maganin sa ya yi ƙasa da na methylcellulose.
Lokacin Saƙo: Afrilu-28-2024