Menene HPMC? Menene MC?

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.

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) 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. Hydroxypropyl methylcellulose yana da kwanciyar hankali ga acid da alkali, kuma maganin sa na ruwa yana da ƙarfi 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.

Methylcellulose kuma 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.

(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.

Methylcellulose yana da tasiri mai mahimmanci akan iya aiki 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.

(3) 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.

Riƙewar ruwa na methylcellulose ya dogara da ƙarin adadinsa, danko, fineness barbashi da adadin rushewa. 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.

(4) 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. Adhesion na hydroxypropyl methylcellulose zuwa turmi gini ya fi na methylcellulose.

Hydroxypropyl methylcelluloseHPMCyana da mafi kyawun juriya na enzyme fiye da methylcellulose, kuma maganinsa ba shi da yuwuwar lalacewa ta hanyar enzymes fiye da methylcellulose.

Canje-canje a cikin zafin jiki na iya tasiri sosai ga riƙewar 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. Lokacin da zafin jiki ya yi girma, gwada zaɓin hydroxypropyl methylcellulose.