Hydroxypropyl methyl cellulose HPMC , kuma aka sani da hydroxypromellose, shi ne wani farin zuwa kashe-fari cellulose ether foda ko granule cewa yana da ruwan sanyi solubility da ruwan zafi inslubility kama da methyl cellulose.Ƙungiyar Hydroxypropyl da ƙungiyar methyl sune ether bond da zoben glucose mai anhydrous na cellulose a hade, wani nau'i ne na cellulose maras ionic gauraye ether.Semi-synthetic ne, mara aiki, polymer viscoelastic da aka saba amfani dashi azaman mai mai a cikin ilimin ido, ko azaman mai haɓakawa ko mai haɓakawa a cikin magungunan baka.
1. Tsarin samarwa
Kraft ɓangaren litattafan almara tare da abun ciki na cellulose na 97%, danko na ciki na 720mL / g da matsakaicin tsayin fiber na 2.6mm an jiƙa a cikin 49% NaOH bayani a 40 ℃ na 50 seconds.Sannan an fitar da ɓangaren litattafan almara don cire wuce haddi na 49% NaOH don samun alkali cellulose.Matsakaicin nauyin (49% NaOH aqueous bayani) zuwa (m bangaren ɓangaren litattafan almara) a cikin matakin impregnation shine 200. Ma'aunin nauyi na NaOH a cikin alkali cellulose zuwa m a ɓangaren litattafan almara shine 1.49.Ana sanya alkali cellulose da aka samu (20kg) a cikin injin daskarewa mai matsa lamba tare da tashin hankali na ciki, sannan a shafe shi kuma a share shi da nitrogen don cire iskar oxygen daga reactor.Sa'an nan, da zazzabi a cikin reactor da aka sarrafa a 60 ℃ yayin da ciki stirring da aka za'ayi.
Sannan an ƙara 2.4kg dME kuma an sarrafa zafin jiki a cikin reactor zuwa 60 ℃.Bayan ƙari na dimethyl ether, an ƙara methylene chloride don yin rabon molar na methylene chloride zuwa NaOH a cikin alkaline cellulose 1.3, an ƙara propylene oxide don yin nauyin nauyin propylene oxide zuwa m a cikin ɓangaren litattafan almara 1.97, da zafin jiki a cikin reactor. An sarrafa daga 60 ℃ zuwa 80 ℃.Bayan ƙara chloromethane da propylene oxide, ana sarrafa zafin jiki a cikin reactor daga 80 ℃ zuwa 90 ℃.Bugu da kari, da dauki dade na 20 minutes a 90 ℃.
Ana fitar da iskar gas daga na'urar kuma ana cire danyen hydroxypropyl methyl cellulose daga reactor.Zazzabi na danyen hydroxypropyl methyl cellulose ya kasance 62 ℃.Auna da tara 50% barbashi size a cikin tarawa nauyi tushen barbashi size rarraba dangane da rabo na danyen hydroxypropyl methyl cellulose ta wurin buɗewa na biyar sieving, kowane da ciwon daban-daban bude size.
A sakamakon haka, matsakaicin girman barbashi na ƙananan barbashi ya kasance 6.2mm.An gabatar da danyen hydroxypropyl methyl cellulose da aka samu a cikin mai ci gaba da biaxial kneader (KRC kneader S1, L/D = 10.2, girma na ciki 0.12 L, saurin juyawa 150rpm) a cikin saurin 10kg / hr, kuma an samu bazuwar danye hydroxypropyl methyl cellulose.A sakamakon irin wannan ma'auni ta amfani da fuska 5 tare da nau'ikan budewa daban-daban, matsakaicin girman ƙwayar ya kasance 1.4mm.Ƙara 80 ℃ ruwan zafi zuwa ga bazuwar danyen hydroxypropyl methyl cellulose a cikin tanki tare da sarrafa zafin jiki na jaket.Adadin nauyin rabo na danye hydroxypropyl methyl cellulose da aka lalata zuwa jimlar adadin slurry shine 0.1, kuma ana samun slurry.An zuga slurry a cikin yawan zafin jiki na 80 ℃ na minti 60.
Sa'an nan, slurry ana kawota zuwa juyi gudun 0.5 RPM da pre-zafi rotary matsa lamba tace (BHS Sonthofen kayayyakin).Zazzabi na grout shine 93 ℃.Yi amfani da famfo don samar da slurry, famfo fitarwa matsa lamba ne 0.2mpa.Girman buɗaɗɗen matattarar matsa lamba shine 80μm, kuma yankin tacewa shine 0.12m2.Ana tace slurry ɗin da aka kawo wa matatar matsa lamba na rotary ta cikin tacewa kuma a canza shi zuwa kek tace.Ana ba da kek ɗin tacewa da aka samu tare da tururi 0.3mpa da ruwan zafi 95 ℃ tare da ma'aunin nauyi na 10.0 zuwa ingantaccen bangaren da aka wanke HYDROXYpropyl methyl cellulose, wanda sannan ana tacewa ta hanyar tacewa.
Ana ba da ruwan zafi ta hanyar famfo a matsa lamba na 0.2mpa.Bayan an ba da ruwan zafi, ana ba da tururi 0.3mpa.Bayan haka, bayan wanke kayan ana cire su daga saman tacewa ta hanyar gogewa kuma a fitar da su daga injin wanki.Matakan daga samar da slurry zuwa fitar da kayayyakin da aka wanke ana ci gaba da yin su.Kamar yadda aka auna ta amfani da zafi - bushewa hygrometer, abun cikin ruwa na samfurin da aka wanke don haka fitarwa ya kasance 52.8%.Kayan da aka wanke da aka fitar daga matatar matsi na rotary an bushe su da na'urar bushewa a 80 ℃, kuma an murƙushe su a cikin injin Nasara don samun hydroxypropyl methyl cellulose.
2.Aaikace-aikace
Ana amfani da samfurin HPMC azaman thickener, dispersant, daure, 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: Maris 23-2022