Hydroxypropyl methylcellulose (sunan INN: Hypromellose), kuma an sauƙaƙe shi azaman hypromellose (hydroxypropyl methylcellulose, an rage shi azamanHPMC), shine nau'in nonionic cellulose gauraye ethers. Semi-synthetic ne, mara aiki, polymer viscoelastic da aka saba amfani dashi azaman mai mai a cikin ilimin ido, ko azaman mai haɓaka ko ƙari a cikin magunguna na baka, kuma ana samun yawanci a cikin samfuran kasuwanci daban-daban.
A matsayin ƙari na abinci, hypromellose na iya taka rawa masu zuwa: emulsifier, thickener, wakili mai dakatarwa da maye gurbin gelatin dabba. Lambar sa (E-code) a cikin Codex Alimentarius ita ce E464.
Abubuwan sinadarai:
A ƙãre samfurinhydroxypropyl methylcellulosefari ne foda ko fari sako-sako da fibrous m, da kuma barbashi size wuce ta cikin 80-raga sieve. Matsakaicin abun ciki na methoxyl zuwa abun ciki na hydroxypropyl na samfurin da aka gama ya bambanta, kuma danko ya bambanta, don haka ya zama nau'ikan nau'ikan nau'ikan wasan kwaikwayo daban-daban. Yana da sifofin kasancewa mai narkewa a cikin ruwan sanyi da kuma rashin narkewa a cikin ruwan zafi kama da methyl cellulose, kuma narkewar sa a cikin kaushi na halitta ya wuce na ruwa. Ana iya narkar da shi a cikin methanol mai anhydrous da ethanol, kuma ana iya narkar da shi cikin chlorinated hydrocarbons kamar dichloro methane, trichloroethane, da sauran kaushi kamar acetone, isopropanol, da diacetone barasa. Lokacin da aka narkar da shi cikin ruwa, zai haɗu da kwayoyin ruwa don samar da colloid. Yana da kwanciyar hankali ga acid da alkali, kuma ba a shafa a cikin kewayon pH = 2 ~ 12. Hypromellose, ko da yake ba mai guba ba ne, yana ƙonewa kuma yana da ƙarfi tare da abubuwan da ke haifar da iskar oxygen.
Dankowar samfuran HPMC yana ƙaruwa tare da haɓaka haɓakawa da nauyin kwayoyin halitta, kuma lokacin da zafin jiki ya tashi, danƙon sa ya fara raguwa. Lokacin da ya kai wani zafin jiki, danko ya tashi ba zato ba tsammani kuma gelation yana faruwa. tsawo na. Maganin sa na ruwa yana da ƙarfi a cikin zafin jiki, sai dai cewa ana iya lalata shi ta hanyar enzymes, kuma gabaɗayan danƙon sa ba shi da wani abu mai lalacewa. Yana da kaddarorin gelation na thermal na musamman, kyawawan abubuwan samar da fim da aikin saman.
Yin:
Bayan da aka yi amfani da cellulose tare da alkali, alkoxy anion da aka samar ta hanyar lalata ƙungiyar hydroxyl na iya ƙara propylene oxide don samar da hydroxypropyl cellulose ether; Hakanan yana iya haɗawa da methyl chloride don samar da ether methyl cellulose. Ana samar da Hydroxypropyl methylcellulose lokacin da aka aiwatar da halayen biyu lokaci guda.
Amfani:
Amfani da hydroxypropyl methylcellulose yayi kama da na sauran ethers cellulose. An fi amfani dashi azaman mai watsawa, wakili mai dakatarwa, mai kauri, emulsifier, stabilizer da m a fannoni daban-daban. Ya fi sauran ethers cellulose cikin sharuddan solubility, dispersibility, nuna gaskiya da juriya na enzyme.
A cikin masana'antar abinci da magunguna, ana amfani da ita azaman ƙari. Ana amfani da shi azaman manne, mai kauri, mai watsawa, Emollient, stabilizer da emulsifier. Ba shi da guba, ba shi da darajar sinadirai, kuma babu canje-canje na rayuwa.
Bugu da kari,HPMCyana da aikace-aikace a cikin roba guduro polymerization, petrochemicals, yumbu, papermaking, fata, kayan shafawa, coatings, ginin kayan da photosensitive faranti.
Lokacin aikawa: Afrilu-25-2024