MC shine methyl cellulose, wanda aka yi da ether cellulose ta hanyar magance auduga mai ladabi tare da alkali, ta yin amfani da methane chloride a matsayin wakili na etherification, da kuma tafiya ta hanyar jerin halayen.Gabaɗaya, matakin maye gurbin shine 1.6 ~ 2.0, kuma solubility shima ya bambanta da digiri daban-daban na maye gurbin.Nasa ne ga wadanda ba ionic cellulose ether.
(1) Riƙewar ruwa na methyl cellulose ya dogara da adadin adadinsa, danko, fineness barbashi da rushewar kudi.Gabaɗaya, idan adadin ƙari yana da girma, ƙarancin ƙarancin ƙanƙara ne, kuma danko yana da girma, yawan riƙe ruwa yana da girma.Daga cikin su, adadin ƙarawa yana da tasiri mafi girma a kan yawan adadin ruwa, kuma matakin danko ba daidai ba ne kai tsaye zuwa matakin yawan ruwa.A rushe kudi yafi dogara a kan mataki na surface gyara na cellulose barbashi da barbashi fineness.Daga cikin ethers cellulose da ke sama, methyl cellulose da hydroxypropyl methyl cellulose suna da ƙimar riƙe ruwa mafi girma.
(2) Methylcellulose yana narkewa a cikin ruwan sanyi, kuma zai yi wuya a narke cikin ruwan zafi.Maganin ruwan sa yana da ƙarfi sosai a cikin kewayon pH = 3 ~ 12.Yana da kyau dacewa tare da sitaci, guar danko, da dai sauransu da yawa surfactants.Lokacin da zafin jiki ya kai ga zafin jiki na gelation, gelation yana faruwa.
(3) Canje-canje a cikin zafin jiki zai yi tasiri sosai akan ƙimar riƙe ruwa na methyl cellulose.Gabaɗaya, mafi girman zafin jiki, mafi munin riƙewar ruwa.Idan yawan zafin jiki na turmi ya wuce 40 ° C, riƙewar ruwa na methyl cellulose zai ragu sosai, yana tasiri sosai ga ginin turmi.
(4) Methyl cellulose yana da tasiri mai mahimmanci akan ginin da mannewa na turmi.“Maɗaukaki” a nan yana nufin ƙarfin mannewa da ake ji tsakanin kayan aikin ma’aikaci da katangar bango, wato, juriyar juriyar turmi.Manne yana da girma, juriya na juriya na turmi yana da girma, kuma ƙarfin da ma'aikata ke bukata a cikin aikin da ake amfani da su yana da girma, kuma aikin ginin turmi ba shi da kyau.Methyl cellulose adhesion yana a matsakaicin matakin a cikin samfuran ether cellulose.
HPMC shi ne hydroxypropyl methylcellulose, wanda ba ionic cellulose gauraye ether sanya daga mai ladabi auduga bayan alkalization, ta yin amfani da propylene oxide da methyl chloride a matsayin etherification jamiái, kuma ta hanyar jerin halayen.Matsakaicin maye gaba ɗaya shine 1.2 ~ 2.0.Kaddarorinsa sun bambanta saboda bambancin rabo na abun ciki na methoxyl da abun ciki na hydroxypropyl.
(1) Hydroxypropyl methylcellulose yana da sauƙin narkewa a cikin ruwan sanyi, kuma zai gamu da matsaloli wajen narkewa cikin ruwan zafi.Amma zafinsa na gelation a cikin ruwan zafi yana da girma fiye da na methyl cellulose.Solubility a cikin ruwan sanyi kuma yana inganta sosai idan aka kwatanta da methyl cellulose.
(2) Dankin hydroxypropyl methylcellulose yana da alaƙa da nauyin kwayoyin halitta, kuma mafi girman nauyin kwayoyin halitta, mafi girman danko.Hakanan yanayin zafi yana rinjayar danko, yayin da zafin jiki ya karu, danko yana raguwa.Duk da haka, babban danko yana da tasirin zafi fiye da methyl cellulose.Maganin sa yana da ƙarfi idan an adana shi a cikin zafin jiki.
(3) Hydroxypropyl methylcellulose ya tsaya tsayin daka ga acid da alkali, kuma maganinsa na ruwa yana da tsayi sosai a cikin kewayon pH = 2 ~ 12.Caustic soda da ruwan lemun tsami suna da ɗan tasiri akan aikin sa, amma alkali na iya hanzarta rushewar kuma yana ƙara danko.Hydroxypropyl methylcellulose ya tsaya tsayin daka ga gishiri na kowa, amma lokacin da maida hankali na maganin gishiri ya yi girma, dankowar maganin hydroxypropyl methylcellulose yana kula da karuwa.
(4) Riƙewar ruwa na hydroxypropyl methylcellulose ya dogara ne akan ƙarin adadinsa, danko, da dai sauransu, kuma yawan ajiyar ruwa a ƙarƙashin adadin adadin adadin ya fi na methyl cellulose.
(5) Hydroxypropyl methylcellulose za a iya haxa shi da ruwa mai narkewa polymer mahadi don samar da uniform da mafi girma danko bayani.Kamar polyvinyl barasa, sitaci ether, kayan lambu danko, da dai sauransu.
(6) Mannewar hydroxypropyl methylcellulose zuwa ginin turmi ya fi na methylcellulose girma.
(7).
Lokacin aikawa: Afrilu-17-2023