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Inqubo yokukhiqiza ye-Hydroxypropyl methyl cellulose HPMC kanye nezicelo

I-Hydroxypropyl methyl cellulose HPMC , eyaziwa nangokuthi i-hydroxypromellose, iyimpushana ye-cellulose ether emhlophe ukuya kokumhlophe noma i-granule ene-solubility yamanzi abandayo kanye nokungancibiliki kwamanzi ashisayo afana ne-methyl cellulose.Iqembu le-Hydroxypropyl neqembu le-methyl yibhondi ye-ether kanye neringi ye-glucose ye-cellulose ehlanganisiwe, iwuhlobo lwe-ether engeyona ionic cellulose exutshwe.Kuyi-semi-synthetic, engasebenzi, i-viscoelastic polymer evame ukusetshenziswa njengesithambisi ku-ophthalmology, noma njengesamukeli noma isamukeli emithini yomlomo.

1. Inqubo yokukhiqiza

I-Kraft pulp enokuqukethwe kwe-αcellulose engu-97%, i-viscosity yangaphakathi engu-720mL /g kanye nesilinganiso sobude be-fiber engu-2.6mm yacwiliswa kusixazululo se-NaOH esingu-49% ku-40℃ imizuzwana engu-50.Khona-ke i-pulp yakhishwa ukuze kukhishwe isisombululo se-NaOH esingu-49% esingaphezulu ukuze kutholwe i-alkali cellulose.Isilinganiso sesisindo (49% NaOH isixazululo samanzi) kuya (ingxenye eqinile ye-pulp) esinyathelweni sokukhulelwa sasingu-200. Isilinganiso sesisindo se-NaOH ku-alkali cellulose kuya kokuqinile ku-pulp ngu-1.49.I-alkali cellulose etholwe ngaleyo ndlela (20kg) ifakwa ku-jacked pressure reactor enokunyakaza kwangaphakathi, bese icocwa futhi ihlanzwe nge-nitrogen ukuze ikhiphe ngokwanele umoya-mpilo ku-reactor.Khona-ke, izinga lokushisa ku-reactor lalilawulwa ku-60 ℃ ngenkathi ukunyakaziswa kwangaphakathi kwenziwa.

Kwabe sekwengezwa i-dME engu-2.4kg futhi izinga lokushisa ku-reactor lalawulwa laya ku-60℃.Ngemva kokwengezwa kwe-dimethyl ether, i-methylene chloride yanezelwa ukwenza isilinganiso se-molar ye-methylene chloride ku-NaOH ku-alkaline cellulose 1.3, i-propylene oxide yanezelwa ukwenza isilinganiso sesisindo se-propylene oxide siqine ku-pulp 1.97, kanye nezinga lokushisa ku-reactor. ilawulwa kusuka ku-60 ℃ kuya ku-80 ℃.Ngemva kokwengeza i-chloromethane ne-propylene oxide, izinga lokushisa ku-reactor lalawulwa ukusuka ku-80℃ kuya ku-90℃.Ngaphezu kwalokho, ukusabela kuthathe imizuzu engama-20 ku-90 ℃.

Igesi ibe isikhishwa kureactor futhi i-hydroxypropyl methyl cellulose engahluziwe iyakhishwa ku-reactor.Izinga lokushisa elingahluziwe le-hydroxypropyl methyl cellulose lalingu-62℃.Linganisa usayizi wezinhlayiyana okhulayo ongu-50% esisindweni esinqwabelene sokusabalalisa usayizi wezinhlayiyana ngokusekelwe esilinganisweni se-hydroxypropyl methyl cellulose engahluziwe ngokusebenzisa izimbobo zokusefa okuyisihlanu, ngakunye kunosayizi wokuvula ohlukile.

Ngenxa yalokho, usayizi wezinhlayiyana omaphakathi wawungu-6.2mm.I-hydroxypropyl methyl cellulose engahluziwe etholwe yethulwa ku-biaxial kneader eqhubekayo (KRC kneader S1, L/D = 10.2, ivolumu yangaphakathi engu-0.12 L, isivinini sokujikeleza esingu-150rpm) ngesivinini esingu-10kg/hr, kanye ne-hydroxypropyl methyl cellulose ebolile ebolile.Njengomphumela wezilinganiso ezifanayo kusetshenziswa izikrini ezi-5 ezinosayizi abahlukene bokuvula, isilinganiso sosayizi wezinhlayiyana sasingu-1.4mm.Yengeza amanzi ashisayo angu-80℃ ku-hydroxypropyl methyl cellulose ebolile ethangini ngokulawulwa kwezinga lokushisa kwebhantshi.inani lesilinganiso sesisindo se-hydroxypropyl methyl cellulose ebolile ukuya enanini eliphelele le-slurry ngu-0.1, futhi i-slurry iyatholakala.I-slurry yashukunyiswa ekushiseni okungaguquki okungama-80 ℃ imizuzu engama-60.

Bese, i-slurry inikezwa ngesivinini esijikelezayo esingu-0.5 RPM kanye nesihlungi se-rotary pressure pre-heated (imikhiqizo ye-BHS Sonthofen).Izinga lokushisa le-grout lingu-93℃.Sebenzisa iphampu ukuze unikeze udaka, ingcindezi yokukhipha iphampu ingu-0.2mpa.Usayizi wokuvula wesihlungi se-rotary pressure ngu-80μm, futhi indawo yokuhlunga ingu-0.12m2.I-slurry ehlinzekwa kusihlungi se-rotary pressure ihlungwa ngesihlungi bese iguqulwa ibe yikhekhe lokuhlunga.Ikhekhe lokuhlunga eliwumphumela lihlinzekwa ngesitimu esingu-0.3mpa kanye namanzi ashisayo angu-95℃ anesilinganiso sesisindo esingu-10.0 engxenyeni eqinile ye-HYDROXYpropyl methyl cellulose egeziwe, ebese ihlungwa ngesihlungi.

Amanzi ashisayo anikezwa ngepompo ngengcindezi yokukhipha engu-0.2mpa.Ngemuva kokunikezelwa kwamanzi ashisayo, umusi we-0.3mpa unikezwa.Khona-ke, ngemva kokuwasha imikhiqizo isuswa endaweni yokuhlunga nge-scraper futhi ikhishwe emshinini wokuwasha.Izinyathelo ukusuka ekunikezeni udaka ukuya ekukhipheni imikhiqizo ewashiwe ziqhutshwa ngokuqhubekayo.Njengoba kulinganiswa kusetshenziswa i-hygrometer yokushisa - ukomisa, okuqukethwe kwamanzi omkhiqizo ohlanziwe ngaleyo ndlela kukhishwe ku-52.8%.Imikhiqizo ewashiwe ekhishwe kusihlungi se-rotary pressure yomiswa ngesomiso somoya ku-80℃, futhi yachotshozwa kumshini wokunqoba ukuze kutholwe i-hydroxypropyl methyl cellulose.

2.Aisicelo

Umkhiqizo we-HPMC usetshenziswa njenge-thickener, dispersant, binder, emulsifier kanye ne-stabilizer embonini yendwangu.Ibuye isetshenziswe kabanzi kuma-synthetic resin, i-petrochemical, i-ceramic, iphepha, isikhumba, imithi, ukudla, izimonyo nezinye izimboni.


Isikhathi sokuthumela: Mar-23-2022