A:
MC shine methyl cellulose: shine auduga mai ladabi bayan maganin alkali, methane chloride a matsayin wakili na etherifying, ta hanyar jerin halayen don yin ether cellulose. Gabaɗaya, matakin maye gurbin shine 1.6 ~ 2.0, kuma solubility ya bambanta da matakin maye gurbin. Ya kasance na nonionic cellulose ether.
(1) Riƙewar ruwa na methyl cellulose ya dogara da adadin adadinsa, danko, fineness barbashi da rushewar kudi. Gabaɗaya ƙara babban adadin, ƙarami fineness, danko, yawan riƙe ruwa yana da girma. Adadin abubuwan da ake ƙarawa yana da tasiri mai girma akan ƙimar riƙewar ruwa, kuma danko ba daidai ba ne da yawan adadin ruwa. A rushe kudi yafi dogara a kan surface gyara digiri da barbashi fineness na cellulose barbashi. A cikin abubuwan da ke sama da yawa ethers cellulose, methyl cellulose da HPMC hydroxypropyl methyl cellulose yawan riƙe ruwa ya fi girma.
(2) Methyl cellulose yana narkewa a cikin ruwan sanyi, wanda ke da wuyar narkewa a cikin ruwan zafi. Maganin ruwan sa yana da ƙarfi sosai a cikin pH = 3 ~ 12. Yana da kyau dacewa da sitaci, guanidine danko da yawa surfactants. Gelation yana faruwa lokacin da yawan zafin jiki ya kai gelation.
(3) Canjin zafin jiki zai yi tasiri sosai akan adadin riƙe ruwa na methyl cellulose. Gabaɗaya, mafi girman zafin jiki, mafi munin riƙewar ruwa. Idan yawan zafin jiki na turmi ya wuce 40 ℃, riƙewar ruwa na methyl cellulose zai zama mafi muni, wanda ke tasiri sosai ga constructability na turmi.
(4) Methyl cellulose yana da tasiri a bayyane akan constructability da adhesion na turmi. "Adhesion" a nan yana nufin mannewa da ma'aikaci ya ji tsakanin kayan aiki da bangon bango, wato juriya na juriya na turmi. Adhesion yana da girma, juriyar juriya na turmi yana da girma, ƙarfin da ma'aikata ke bukata wajen amfani da shi kuma yana da girma, kuma ginin turmi ba shi da kyau. A cikin samfuran ether cellulose, mannewar methyl cellulose yana a matsakaicin matakin.
HPMC shine hydroxypropyl methyl cellulose: an yi shi da auduga mai ladabi bayan maganin alkali, tare da propylene oxide da chloromethane a matsayin wakili na etherifying, ta hanyar jerin halayen da aka yi da ether ba-ionic cellulose. Matsakaicin maye gaba ɗaya shine 1.2 ~ 2.0. Kaddarorinsa sun bambanta da rabon methoxy da abun ciki na hydroxypropyl.
(1) HPMC hydroxypropyl methyl cellulose yana da sauƙin narkewa a cikin ruwan sanyi, wanda ke da wuyar narkewa a cikin ruwan zafi. Duk da haka, zafinsa na gelation a cikin ruwan zafi a fili ya fi na methyl cellulose girma. Solubility na methyl cellulose a cikin ruwan sanyi kuma an inganta sosai.
(2) Dankowar HPMC hydroxypropyl methyl cellulose yana da alaƙa da nauyin kwayoyin halitta, kuma mafi girman nauyin kwayoyin halitta, mafi girman danko. Zazzabi kuma yana rinjayar danko. Danko yana raguwa yayin da zafin jiki ya karu. Amma tasirinsa na danko yana da ƙasa da na methyl cellulose. Maganin yana da ƙarfi lokacin da aka adana shi a cikin zafin jiki.
(3) HPMC hydroxypropyl methyl cellulose yana da kwanciyar hankali ga acid da tushe, kuma maganin sa na ruwa yana da tsayi sosai a cikin kewayon pH = 2 ~ 12. Caustic soda da ruwan lemun tsami suna da ɗan tasiri akan kaddarorin sa, amma alkali na iya haɓaka ƙimar narkarwar sa kuma inganta danko. HPMC hydroxypropyl methyl cellulose ne barga zuwa general salts, amma a lokacin da taro na gishiri bayani ne high, da danko na HPMC hydroxypropyl methyl cellulose bayani o ƙarin tabbatar da karuwa.
(4) Riƙewar ruwa na HPMC hydroxypropyl methyl cellulose ya dogara da adadinsa da danko, kuma yawan riƙewar ruwa na HPMC hydroxypropyl methyl cellulose ya fi na methyl cellulose girma a daidai sashi.
(5) HPMC hydroxypropyl methyl cellulose za a iya gauraye da ruwa-mai narkewa polymer mahadi ya zama uniform, mafi girma danko bayani. Kamar polyvinyl barasa, sitaci ether, kayan lambu manne da sauransu.
(6) Adhesion na HPMC hydroxypropyl methyl cellulose zuwa turmi gini ya fi na methyl cellulose.
(7) HPMC hydroxypropyl methyl cellulose yana da mafi kyawun juriya na enzyme fiye da methyl cellulose, kuma yuwuwar lalatawar enzyme ɗinta shine ƙasa da na methyl cellulose.
Lokacin aikawa: Mayu-26-2022