1.Hydroxypropyl methyl cellulose
Hydroxypropyl methylcellulosewani nau'in cellulose ne wanda fitarwa da amfaninsa ke karuwa cikin sauri. Yana da ether wanda ba na ionic cellulose ba wanda aka yi daga auduga mai ladabi bayan alkalization, ta amfani da propylene oxide da methyl chloride a matsayin wakili na etherification, ta hanyar jerin halayen. Matsakaicin maye gaba ɗaya shine 1.2 ~ 2.0. Kaddarorinsa sun bambanta dangane da rabon abun ciki na methoxyl zuwa 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) (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, tasirin babban danko da zafinsa ya yi ƙasa da na methyl cellulose. Maganin sa yana da ƙarfi idan an adana shi a cikin zafin jiki.
(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.
(4) Hydroxypropyl methylcellulose yana da kwanciyar hankali 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 sa kuma ya ɗan ƙara ɗanɗanon sa. 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.
(5) Hydroxypropyl methylcellulose za a iya haɗe shi da polymers masu narkewa da ruwa don samar da tsari iri ɗaya, mafi girman danko. Kamar polyvinyl barasa, sitaci ether, kayan lambu danko, da dai sauransu.
(6).
(7) Mannewar hydroxypropyl methylcellulose zuwa ginin turmi ya fi na methylcellulose girma.
2. Hydroxyethyl cellulose
An yi shi daga auduga mai ladabi da aka yi da alkali, kuma an yi shi da ethylene oxide a matsayin wakili na etherification a gaban isopropanol. Matsayinsa na maye gurbin shine gabaɗaya 1.5 ~ 2.0. Yana da karfi hydrophilicity kuma yana da sauƙin sha danshi.
(1) Hydroxyethyl cellulose yana narkewa a cikin ruwan sanyi, amma yana da wuya a narke cikin ruwan zafi. Maganin sa yana da ƙarfi a babban zafin jiki ba tare da gelling ba. Ana iya amfani da shi na dogon lokaci a ƙarƙashin yanayin zafi mai zafi a turmi, amma riƙewar ruwa ya fi na methyl cellulose.
(2)Hydroxyethyl celluloseyana da karko ga janar acid da alkali, kuma alkali na iya hanzarta rushewar kuma dan ƙara danko. Rarrabuwar sa a cikin ruwa ya ɗan yi muni fiye da na methyl cellulose da hydroxypropyl methyl cellulose.
(3) Hydroxyethyl cellulose yana da kyakkyawan aikin anti-sag don turmi, amma yana da lokaci mai tsawo don ciminti.
(4) Ayyukan hydroxyethyl cellulose da wasu masana'antun cikin gida ke samarwa a fili ya yi ƙasa da na methyl cellulose saboda yawan ruwa da kuma yawan toka.
(5) Mildew na maganin ruwa na hydroxyethyl cellulose yana da muni. A zafin jiki na kimanin 40 ° C, mildew na iya faruwa a cikin kwanaki 3 zuwa 5, wanda zai shafi aikinsa.
Lokacin aikawa: Afrilu-28-2024