Hydroxypropyl methyl cellulose HPMC , eo hape e tsejoang e le hydroxypromellose, ke phofo e tšoeu ho ea ho e tšoeu ea cellulose ether kapa granule e nang le ho qhibiliha ha metsi a batang le metsi a chesang a sa tsitsang a tšoanang le methyl cellulose.Sehlopha sa Hydroxypropyl le sehlopha sa methyl ke bond ea ether le lesale la tsoekere la anhydrous la selulose li kopantsoe, ke mofuta oa ether e seng ea ionic cellulose e tsoakiloeng.Ke semi-synthetic, e sa sebetseng, viscoelastic polymer e atisang ho sebelisoa e le setlolo sa mahlo, kapa e le se thusang kapa se thusang meriana ea molomo.
1. Mokhoa oa tlhahiso
Kraft pulp e nang le αcellulose content ea 97%, intrinsic viscosity ea 720mL / g le bolelele ba fiber ea 2.6mm e kolobisitsoe ka tharollo ea 49% ea NaOH ho 40 ℃ bakeng sa metsotsoana e 50.Joale makhasi a ile a fetisoa ho tlosa tharollo ea NaOH e feteletseng ea 49% ho fumana selulose ea alkali.Karo-karolelano ea boima ba (49% NaOH aqueous solution) ho (karolo e tiileng ea makhasi) mohatong oa ho inregnation e ne e le 200. Karo-karolelano ea boima ba NaOH ka selulose ea alkali ho e tiileng ka har'a makhasi ke 1.49.Alkali cellulose e fumanoeng ka tsela eo (20kg) e kenngoa ka har'a mochine oa khatello ea jack e nang le ts'ebetso e ka hare, ebe e hloekisoa ebe e hloekisoa ka naetrojene ho tlosa oksijene ka ho lekaneng ho tloha mochineng.Joale, mocheso ka har'a reactor o ne o laoloa ho 60 ℃ ha ts'usumetso e ka hare e ntse e etsoa.
Joale 2.4kg dME e ile ea eketsoa mme thempereichara ka har'a reactor e laoloa ho 60 ℃.Ka mor'a ho eketsoa ha dimethyl ether, methylene chloride e ile ea eketsoa ho etsa molar ratio ea methylene chloride ho NaOH ka alkaline cellulose 1.3, propylene oxide e ile ea eketsoa ho etsa hore boima ba 'mele ba propylene oxide bo tiee ka har'a makhasi a 1.97, le mocheso ka har'a reactor. e ne e laoloa ho tloha ho 60 ℃ ho ea ho 80 ℃.Ka mor'a ho eketsa chloromethane le propylene oxide, mocheso oa mochine o ne o laoloa ho tloha ho 80 ℃ ho ea ho 90 ℃.Ho feta moo, karabelo e ile ea nka metsotso e 20 ho 90 ℃.
Khase ebe e ntšoa ho reactor ebe crude hydroxypropyl methyl cellulose e ntšoa ho reactor.Thempereichara ea hydroxypropyl methyl cellulose e ne e le 62 ℃.Lekanya kakaretso ea 50% ea boholo ba likaroloana kabong ea boima bo akaretsang ho ipapisitsoe le karo-karolelano ea hydroxypropyl methyl cellulose ka masoba a sieving a mahlano, e 'ngoe le e 'ngoe e na le boholo bo fapaneng ba ho bula.
Ka lebaka leo, karolelano ea boholo ba likaroloana tse mahoashe e ne e le 6.2mm.Sehlahisoa se fumanoeng sa hydroxypropyl methyl cellulose se ile sa kenngoa ka har'a kneader e tsoelang pele ea biaxial (KRC kneader S1, L / D = 10.2, molumo o ka hare oa 0.12 L, lebelo la ho potoloha 150rpm) ka lebelo la 10kg / hr, le hydroxypropyl methyl cellulose e bolileng e bolileng.Ka lebaka la litekanyo tse tšoanang ho sebelisoa li-skrini tse 5 tse nang le boholo bo fapaneng ba ho bula, boholo ba karoloana e ne e le 1.4mm.Ho eketsa metsi a chesang a 80 ℃ ho hydroxypropyl methyl cellulose e bolileng ka tanka ka taolo ea mocheso oa baki.palo ea tekanyo ea boima ba crude hydroxypropyl methyl cellulose ho palo eohle ea slurry ke 0.1, 'me slurry e fumanoa.The slurry e ile ea tsosoa ka mocheso o sa khaotseng oa 80 ℃ ka metsotso e 60.
Joale, slurry e fanoa ka lebelo le potolohang la 0.5 RPM le preheated rotary pressure filter (lihlahisoa tsa BHS Sonthofen).Thempereichara ea grout ke 93 ℃.Sebelisa pompo ho fana ka slurry, khatello ea ho ntša pompo ke 0.2mpa.Boholo ba ho bula mochini oa khatello ea rotary ke 80μm, 'me sebaka sa filthara ke 0.12m2.The slurry e fanoang ho rotary filthara ea khatello e tlhotluoa ka sefeng ebe e fetoloa kuku ea sefe.Kaka e hlahisoang e fanoa ka mouoane oa 0.3mpa le metsi a chesang a 95 ℃ ka tekanyo ea boima ba 10.0 ho karolo e tiileng ea HYDROXYpropyl methyl cellulose e hlatsoitsoeng, ebe e sefshoa ka sefe.
Metsi a chesang a fanoa ka pompo ka khatello ea ho ntša metsi ea 0.2mpa.Ka mor'a hore ho fanoe ka metsi a chesang, mouoane oa 0.3mpa o fanoa.Ka mor'a moo, ka mor'a hore lihlahisoa tsa ho hlatsoa li tlosoe holim'a sefahla ka scraper 'me li lokolloe ka ntle ho mochine oa ho hlatsoa.Mehato ea ho tloha ho fana ka slurry ho ea ho lihlahisoa tse hlatsoitsoeng li etsoa kamehla.Joalokaha ho lekantsoe ho sebelisoa mocheso - ho omisa hygrometer, metsi a sehlahisoa se hlatsoitsoeng ka tsela eo a lokolloa e ne e le 52.8%.Lihlahisoa tse hlatsoitsoeng tse tsoang mochining oa khatello ea rotary li ile tsa omisoa ke se omisa moea ka 80 ℃, 'me tsa siloa ka leloaleng la Victory ho fumana hydroxypropyl methyl cellulose.
2.Akopo
Sehlahisoa sa HPMC se sebelisoa e le motenya, dispersant, binder, emulsifier le stabilizer indastering ea masela.E boetse e sebelisoa haholo ho resin ea maiketsetso, petrochemical, ceramic, pampiri, letlalo, meriana, lijo, litlolo le liindasteri tse ling.
Nako ea poso: Mar-23-2022