Hydroxypropyl methylcellulose (Hypromellose), kuma aka sani da hypromellose, fari ne zuwa kashe-fari cellulose foda ko granule, wanda yana da halaye na zama mai narkewa a cikin ruwan sanyi da kuma insoluble a cikin ruwan zafi kama da methyl cellulose. Ƙungiyar hydroxypropyl da ƙungiyar methyl an haɗa su tare da zoben glucose mai anhydrous na cellulose ta hanyar ether bond, wanda shine nau'in cellulose mai hade da ether. Semisynthetic ne, mara aiki, polymer viscoelastic da aka saba amfani da shi azaman mai mai a cikin ilimin ido, ko azaman abin haɓakawa ko abin hawa a cikin magungunan baka.
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Rubutun ɓangaren litattafan almara na ɓangaren litattafan almara da aka samo daga itacen pine tare da abun ciki na alpha cellulose na 97%, danko na ciki na 720 ml/g, da matsakaicin tsayin fiber na 2.6 mm an nutsar da shi a cikin 49% NaOH bayani mai ruwa a 40 ° C. 50 seconds; An matse ɓangaren litattafan almara don cire fiye da 49% na ruwa NaOH don samun alkali cellulose. Matsakaicin nauyin (49% NaOH aqueous bayani) zuwa (m abun ciki a cikin ɓangaren litattafan almara) a cikin matakin impregnation ya kasance 200. Ma'aunin nauyi na (abin da ke cikin NaOH a cikin alkali cellulose don haka samu) da (m abun ciki a cikin ɓangaren litattafan almara) ya kasance. 1.49. The alkali cellulose haka samu (20 kg) aka sanya a cikin jacketed matsa lamba reactor tare da ciki stirring, sa'an nan fitar da kuma tsarkake da nitrogen don isasshe cire oxygen daga reactor. Bayan haka, an yi motsi na ciki yayin da ake sarrafa zafin jiki a cikin reactor zuwa 60 ° C. Sa'an nan, an ƙara 2.4 kg na dimethyl ether, kuma ana sarrafa zafin jiki a cikin reactor don kiyaye shi a 60 ° C. Bayan ƙara dimethyl ether, ƙara dichloromethane domin molar rabo na (dichloromethane) zuwa (NaOH bangaren a alkaline cellulose) ne 1.3, da kuma ƙara propylene oxide don yin (propylene oxide) da (a cikin ɓangaren litattafan almara) The nauyi rabo na m abun ciki) An canza shi zuwa 1.97, yayin da zafin jiki a cikin reactor ana sarrafa shi daga 60 ° C zuwa 80 ° C. Bayan ƙara methyl chloride da propylene oxide, ana sarrafa zafin jiki a cikin reactor daga 80 ° C zuwa 90 ° C. Bugu da ƙari kuma, an ci gaba da amsawa a 90 ° C na minti 20. Sa'an nan kuma, an fitar da iskar daga reactor, sa'an nan kuma an fitar da danyen hydroxypropyl methylcellulose daga reactor. Matsakaicin danyen hydroxypropyl methylcellulose a lokacin shan shine 62 ° C. The tara 50% barbashi size a cikin barbashi size rarraba dangane da tara nauyi ƙaddara bisa ga rabo na danyen hydroxypropyl methylcellulose wucewa ta cikin bude na biyar sieves, kowane sieve ciwon daban-daban bude size, da aka auna. A sakamakon haka, matsakaita girman barbashi na ƙananan barbashi ya kasance 6.2 mm. Ta haka ne aka gabatar da danyen hydroxypropyl methylcellulose a cikin ci gaba da biaxial kneader (KRC kneader S1, L/D = 10.2, girma na ciki 0.12 lita, saurin juyawa 150 rpm) a cikin adadin 10 kg / hr, kuma an samu bazuwar. na danyen hydroxypropyl methylcellulose. Matsakaicin girman barbashi ya kasance 1.4 mm kamar yadda aka auna haka ta amfani da sieves na masu girma dabam 5 daban-daban. Zuwa bazuwar danyen hydroxypropyl methylcellulose a cikin tanki tare da kula da zafin jiki na jaket, ƙara ruwan zafi a 80 ° C a cikin adadin irin wannan (Ma'aunin nauyi na adadin cellulose) zuwa ( jimlar adadin slurry) an canza zuwa 0.1, kuma an samu slurry. An motsa slurry a cikin zafin jiki na 80 ° C na minti 60. Bayan haka, an ciyar da slurry a cikin matattarar matsa lamba mai zafi (samfurin BHS-Sonthofen) tare da saurin juyawa na 0.5 rpm. Zazzabi na slurry ya kasance 93 ° C. An ba da slurry ta amfani da famfo, kuma matsa lamba na famfo shine 0.2 MPa. Girman buɗewar tacewa na matattarar matsa lamba shine 80 μm, kuma yankin tacewa shine 0.12 m 2. slurry da aka kawo wa matatar matsa lamba na jujjuya ana juyawa zuwa kek tace ta tacewa. Bayan samar da tururi na 0.3 MPa ga cake don haka samu, ruwan zafi a 95 ° C aka kawo a cikin irin wannan adadin da nauyi rabo na (ruwa zafi) zuwa (m abun ciki na hydroxypropyl methylcellulose bayan wanka) ya kasance 10.0, Sa'an nan, tace ta hanyar. tace. An ba da ruwan zafi ta hanyar famfo a matsa lamba na 0.2 MPa. Bayan an ba da ruwan zafi, an ba da tururi na 0.3 MPa. Sa'an nan kuma, samfurin da aka wanke a saman tacewa yana cire shi ta hanyar juzu'i kuma a fitar da shi daga injin wanki. Matakan daga ciyar da slurry zuwa fitar da samfurin da aka wanke ana aiwatar dasu akai-akai. Sakamakon aunawa ta amfani da nau'in bushewar zafi na hygrometer, abun da ke cikin ruwa na samfurin da aka wanke don haka fitarwa ya kasance 52.8%. Samfurin da aka wanke da aka fitar daga matatar matsi na rotary an bushe shi ta amfani da na'urar bushewa a 80 ° C., kuma an niƙa shi a cikin injin niƙa Nasara don samun hydroxypropyl methylcellulose.
aikace-aikace
Ana amfani da wannan samfurin azaman mai kauri, mai watsawa, ɗaure, emulsifier da stabilizer a masana'antar yadi. Hakanan ana amfani dashi sosai a cikin guduro roba, petrochemical, yumbu, takarda, fata, magani, abinci, kayan kwalliya da sauran masana'antu.
Lokacin aikawa: Nuwamba-15-2022