1. Hydroxypropyl methyl cellulose
Hydroxypropyl methylcellulosenau'in cellulose ne wanda fitarwa da amfaninsa ke ƙaruwa cikin sauri. Yana da gaurayen ether na cellulose wanda ba ionic ba ne wanda aka yi daga auduga mai tsafta bayan alkali, ta amfani da propylene oxide da methyl chloride a matsayin wakilin etherification, ta hanyar jerin halayen. Matsayin maye gurbin gabaɗaya shine 1.2~2.0. Halayensa sun bambanta dangane da rabon 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) (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, tasirin dankowar sa da zafinsa ya yi ƙasa da na methyl cellulose. Maganin sa yana da ƙarfi idan aka adana shi a zafin ɗaki.
(3) 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.
(4) Hydroxypropyl methylcellulose yana da daidaito ga acid da alkali, kuma ruwan da ke cikinsa yana da daidaito sosai a cikin pH = 2 ~ 12. Soda mai kauri da ruwan lemun tsami ba su da tasiri sosai a kan aikinsu, amma alkali na iya hanzarta saurin narkewarsa da kuma ƙara ɗanɗanonsa. Hydroxypropyl methylcellulose yana da daidaito ga gishirin da aka saba da shi, amma idan yawan ruwan gishiri ya yi yawa, ɗanɗano na ruwan hydroxypropyl methylcellulose yana ƙaruwa.
(5) Ana iya haɗa Hydroxypropyl methylcellulose da polymers masu narkewa cikin ruwa don samar da mafita mai kama da juna, mai ƙarfi. Kamar polyvinyl alcohol, sitaci ether, man shafawa na kayan lambu, da sauransu.
(6) Hydroxypropyl methylcellulose yana da juriya ga enzyme fiye da methylcellulose, kuma maganin sa ba shi da yuwuwar lalacewa ta hanyar enzymes fiye da methylcellulose.
(7) Mannewar hydroxypropyl methylcellulose ga ginin turmi ya fi na methylcellulose girma.
2. Hydroxyethyl cellulose
An yi shi ne da auduga mai kyau da aka yi wa magani da alkali, kuma ana yin sa da ethylene oxide a matsayin maganin etherification idan aka haɗa shi da isopropanol. Matsakaicin maye gurbinsa gabaɗaya shine 1.5 ~ 2.0. Yana da ƙarfi sosai kuma yana da sauƙin sha danshi.
(1) Hydroxyethyl cellulose yana narkewa a cikin ruwan sanyi, amma yana da wuya a narke a cikin ruwan zafi. Maganin sa yana da ƙarfi a zafin jiki mai yawa ba tare da gel ba. Ana iya amfani da shi na dogon lokaci a cikin zafin jiki mai yawa a cikin turmi, amma riƙewar ruwansa ya yi ƙasa da na methyl cellulose.
(2)Sinadarin Hydroxyethyl celluloseyana da daidaito ga acid da alkali gabaɗaya, kuma alkali na iya hanzarta narkewarsa da kuma ƙara ɗanɗanonsa kaɗan. Watsewarsa a cikin ruwa ya ɗan fi muni fiye da na methyl cellulose da hydroxypropyl methyl cellulose.
(3) Hydroxyethyl cellulose yana da kyakkyawan aikin hana sag ga turmi, amma yana da tsawon lokacin jinkirin siminti.
(4) Ayyukan hydroxyethyl cellulose da wasu kamfanonin cikin gida ke samarwa a bayyane yake ƙasa da na methyl cellulose saboda yawan ruwa da kuma yawan toka da ke cikinsa.
(5) Ruwan da ke cikin ruwan maganin hydroxyethyl cellulose yana da matuƙar illa. A yanayin zafi na kimanin 40°C, ruwan da ke cikinsa na iya faruwa cikin kwana 3 zuwa 5, wanda hakan zai shafi aikinsa.
Lokacin Saƙo: Afrilu-28-2024