Hydroxypropyl methylcellulose (Hypromellose), eo hape e tsejoang e le hypromellose, ke phofshoana e tšoeu ho ea ho e tšoeu ea cellulose kapa granule, e nang le litšobotsi tsa ho qhibiliha metsing a batang le ho se qhibilihe metsing a chesang a tšoanang le methyl cellulose.Sehlopha sa hydroxypropyl le sehlopha sa methyl li kopantsoe le lesale la tsoekere la anhydrous la selulose ka bond ea ether, e leng mofuta oa selulose e se nang ionic e tsoakiloeng ether.Ke polymer ea semisynthetic, e sa sebetseng, e nang le viscoelastic e atisang ho sebelisoa e le setlolo sa mahlo, kapa e le se thusang kapa koloi meriana ea molomo.
tokisetso
Letlapa la pampiri ea kraft ea pampiri e fumanoeng ho tloha lehong la phaene le nang le alpha cellulose content ea 97%, viscosity ea kahare ea 720 ml / g, le bolelele ba fiber ea 2.6 mm e qoelitsoe ka 49% ea metsi a NaOH a 40 ° C. metsotsoana e 50;makhasi a hlahisoang a ne a hatelloa ho tlosa metsi a mangata a 49% NaOH ho fumana selulose ea alkali.Karo-karolelano ea boima ba (49% NaOH aqueous solution) ho (litaba tse tiileng ka har'a makhasi) mohatong oa ho kenya letsoho e ne e le 200. Karo-karolelano ea boima ba (litaba tsa NaOH ka selulose ea alkali e fumanoeng ka tsela eo) le (lintho tse tiileng ka har'a makhasi) li ne li le teng. 1.49.Alkali cellulose e fumanoeng ka tsela eo (20 kg) e ile ea behoa ka har'a mochine oa khatello ea jekete e nang le moferefere o ka hare, ebe oa ntšoa ebe o hloekisoa ka naetrojene ho tlosa oksijene ka ho lekaneng ho tloha mochineng.Ka mor'a moo, ho sisinyeha ka hare ho ile ha etsoa ha ho ntse ho laola mocheso ka har'a reactor ho 60 ° C.Joale, 2.4 kg ea dimethyl ether e ile ea eketsoa, 'me mocheso o ka har'a reactor o ile oa laoloa hore o bolokehe ho 60 ° C.Ka mor'a ho eketsa dimethyl ether, eketsa dichloromethane e le hore tekanyo ea molar ea (dichloromethane) ho (karolo ea NaOH ka alkaline cellulose) e be 1.3, 'me u kenye propylene oxide ho etsa (propylene oxide) le (ka pulp) Boima ba boima ba lintho tse tiileng) e fetotsoe ho 1.97, ha thempereichara ka har'a reactor e laoloa ho tloha ho 60°C ho ea ho 80°C.Ka mor'a ho eketsoa ha methyl chloride le propylene oxide, mocheso oa sekontiri o ile oa laoloa ho tloha ho 80 ° C ho ea ho 90 ° C.Ho feta moo, karabelo e ile ea tsoela pele ho 90 ° C ka metsotso e 20.Ka mor'a moo, khase e ile ea ntšoa ho tloha setsing sa motlakase, 'me joale hydroxypropyl methylcellulose e sa tsoakoang ea ntšoa ho tloha setsing sa motlakase.Thempereichara ea hydroxypropyl methylcellulose e tala nakong ea ho tsoa e ne e le 62 degreesC.Kakaretso ea 50% ea boholo ba phatsa kabong ea boholo ba karoloana e ipapisitseng le boima ba boima bo lekantsoeng ho ipapisitsoe le karo-karolelano ea hydroxypropyl methylcellulose e fetang masobeng a lisefo tse hlano, sefe ka seng se nang le boholo bo fapaneng ba ho bula.Ka lebaka leo, karolelano ea boholo ba likaroloana tsa likaroloana tse mahoashe e ne e le 6.2 mm.Ka hona, hydroxypropyl methylcellulose e fumanoeng ka tsela eo e ile ea kenngoa ka har'a kneader e tsoelang pele ea biaxial (KRC kneader S1, L / D = 10.2, bophahamo ba ka hare ba 0.12 litres, lebelo la ho potoloha 150 rpm) ka tekanyo ea 10 kg / hr, 'me ho senyeha ho ile ha fumanoa.ea hydroxypropyl methylcellulose e tala.Karolelano ea boholo ba likaroloana e ne e le 1.4 mm ha e lekantsoe ka mokhoa o ts'oanang ho sebelisoa li-sieve tsa boholo bo fapaneng ba 5 ba ho bula.Ho hydroxypropyl methylcellulose e bolileng ka tanka e nang le taolo ea mocheso oa baki, eketsa metsi a chesang ho 80 ° C ka bongata boo (Tekanyo ea boima ba selulose) ho (kakaretso ea slurry) e fetotsoe ho 0.1, le seretse se fumanoe.The slurry e ile ea tsosoa ka mocheso o sa khaotseng oa 80 ° C ka metsotso e 60.Ka mor'a moo, slurry e ne e kenngoa ka har'a mochine oa khatello ea rotary preheated (sehlahisoa sa BHS-Sonthofen) ka lebelo la ho potoloha la 0.5 rpm.Thempereichara ea slurry e ne e le 93°C.Sehlahisoa se ne se fanoa ho sebelisoa pompo, 'me khatello ea ho tsoa ha pompo e ne e le 0.2 MPa.Boholo ba ho bula filthara ea sekhahla sa khatello ea rotary e ne e le 80 μm, 'me sebaka sa ho hloekisa e ne e le 0.12 m2.The slurry e fanoang ho rotary pressure filter e fetoloa kuku ea sefe ka ho hloekisa.Ka mor'a ho fana ka mouoane oa 0.3 MPa ho kuku e fumanoeng ka tsela eo, metsi a chesang a 95 ° C a ne a fanoa ka bongata hoo tekanyo ea boima ba (metsi a chesang) ho (litekanyo tse tiileng tsa hydroxypropyl methylcellulose ka mor'a ho hlatsoa) e ne e le 10.0, Joale, sefa ka ho fetisisa. sefefo.Metsi a chesang a ne a fanoa ke pompo ka khatello ea ho ntša metsi ea 0.2 MPa.Ka mor'a hore metsi a chesang a fanoe, ho ile ha fanoa ka mouoane oa 0.3 MPa.Ka mor'a moo, sehlahisoa se hlatsoitsoeng holim'a sefahleho se hloekisitsoeng se ntšoa ke scraper ebe se ntšoa ka mochine oa ho hlatsoa.Mehato ea ho fepa slurry ho ea ho ntša sehlahisoa se hlatsoitsoeng se etsoa kamehla.Ka lebaka la ho lekanya ho sebelisa hygrometer ea mofuta oa ho omisa mocheso, metsi a sehlahisoa se hlatsoitsoeng ka tsela eo e ne e le 52.8%.Sehlahisoa se hlatsoitsoeng se tsoang mochining oa khatello ea rotary se ile sa omisoa ka mochini o omisang moea ka 80 ° C., 'me sa silafatsoa ka leloala la Victory ho fumana hydroxypropyl methylcellulose.
kopo
Sehlahisoa sena se sebelisoa e le thickener, dispersant, binder, emulsifier le stabilizer indastering ea masela.E boetse e sebelisoa haholo ho resin ea maiketsetso, petrochemical, ceramics, pampiri, letlalo, meriana, lijo, litlolo le liindasteri tse ling.
Nako ea poso: Nov-15-2022