Ko te Hydroxypropyl methylcellulose (Hypromellose), e mohiotia ana ko te hypromellose, he ma ki te ma-kore-ma te paura cellulose, he granule ranei, kei a ia nga ahuatanga o te wairewa i roto i te wai makariri me te kore e rewa i roto i te wai wera rite ki te methyl cellulose.Ko te roopu hydroxypropyl me te roopu methyl ka honoa ki te mowhiti huka anhydrous o te cellulose na roto i te here ether, he ahua o te cellulose kore-ionic i konatunatua ether.He polymer hauhanga, kore hohe, viscoelastic e whakamahia nuitia ana hei whakahinuhinu i roto i nga mahi ophthalmology, hei awhina, hei waka ranei i roto i nga rongoa waha.
whakarite
Ko te penupenu pepa o te penupenu pepa kraft i riro mai i te rakau paina he 97% te kiko o te cellulose alpha, he 720 ml/g, me te roa o te muka toharite o te 2.6 mm i rumakina ki te wairewa wai 49% NaOH i te 40°C. 50 hēkona;katahi ka ruia te penupenu ki te tango i te taikaha 49% te NaOH wai kia whiwhi cellulose alkali.Ko te tauwehenga o te taumaha o (49% NaOH wairewa wai) ki (te kiko totoka i roto i te penupenu) i roto i te taahiraa impregnation he 200. Ko te tauwehenga taumaha o (te ihirangi NaOH i roto i te cellulose alkali kua riro) me (te kiko totoka i roto i te penupenu) ko 1.49.Ko te cellulose alkali (20 kg) ka tukuna ki roto i te reactor pehanga koti me te whakakorikori o roto, katahi ka whakatahia ka purea ki te hauota kia pai ai te tango i te hāora mai i te reactor.I muri mai, ka mahia te whakakorikori o roto i te wa e whakahaere ana te pāmahana i roto i te reactor ki te 60°C.I muri iho, 2.4 kg o te dimethyl ether i tapirihia, ka whakahaeretia te pāmahana i roto i te reactor kia noho ki te 60°C.I muri i te taapiri i te dimethyl ether, me tapirihia te dichloromethane kia 1.3 te ōwehenga molar o (dichloromethane) ki te (wahanga NaOH i roto i te cellulose alkaline), me te taapiri i te propylene oxide hei hanga (propylene oxide) me te (i roto i te penupenu) Te ōwehenga taumaha o te ihirangi totoka) i hurihia ki te 1.97, i te mea ka whakahaerehia te pāmahana i roto i te reactor mai i te 60°C ki te 80°C.I muri i te taapiri o te methyl chloride me te propylene oxide, ka whakahaeretia te pāmahana i roto i te reactor mai i te 80°C ki te 90°C.I tua atu, ka haere tonu te tauhohenga i te 90°C mo te 20 meneti.Na, ka tukuna te hau mai i te reactor, katahi ka tangohia mai te makuku hydroxypropyl methylcellulose mai i te reactor.Ko te pāmahana o te hydroxypropyl methylcellulose masivesivá i te wa o te tangohanga he 62 nga nekehangaC.Ko te 50% te rahi o te matūriki i roto i te tohatoha rahi matūriki i runga i te taumaha whakahiato i whakatauhia i runga i te ōwehenga o te hydroxypropyl methylcellulose masivesivá e haere ana i nga tuwhera o nga tatari e rima, he rereke te rahi o te whakatuwheratanga o ia tatari.Ko te mutunga, ko te rahi o te matūriki toharite o nga matūriki taratara he 6.2 mm.Ko te hydroxypropyl methylcellulose masivesivá kua riro mai i whakauruhia ki roto i te kneader biaxial tonu (KRC kneader S1, L/D=10.2, rōrahi roto 0.12 rita, tere hurihanga 150 rpm) i te tere o te 10 kg/haora, ka puta te pirau.o te makuku hydroxypropyl methylcellulose.Ko te rahi o te matūriki toharite ko te 1.4 mm i rite te inenga ma te whakamahi i nga tatari e 5 nga rahi tuwhera rereke.Ki te hydroxypropyl methylcellulose masivesivá pirau i roto i te tank ki te mana pāmahana koti, tāpiri i te wai wera i te 80°C i roto i te nui pera ( Ko te ōwehenga taimaha o te nui o te cellulose) ki (te tapeke o te slurry) i hurihia ki te 0.1, a i riro mai he slurry.I whakakorikoria te slurry i te pāmahana 80°C mo te 60 meneti.I muri mai, ka whangaia te slurry ki roto i te tātari pehanga hurihuri (hua o BHS-Sonthofen) me te tere hurihuri o te 0.5 rpm.He 93°C te mahana o te parapara.I tukuna mai te slurry ma te papu, a ko te pehanga tuku o te papu he 0.2 MPa.Ko te rahi tuwhera o te tātari o te tātari pēhanga hurihuri ko 80 μm, me te wāhi filtration ko 0.12 m 2.Ko te slurry i tukuna ki te tātari pehanga hurihuri ka huri ki te keke tātari ma te tātari tātari.I muri i te tuku mamaoa o te 0.3 MPa ki te keke ka puta, ka tukuna he wai wera i te 95°C kia rite te nui o te tauwehenga o te (wai wera) ki te (te kiko totoka o te hydroxypropyl methylcellulose i muri i te horoinga) he 10.0, Na, tātari ma te tātari.Ko te wai wera i tukuna mai e te papu i te pehanga tuku 0.2 MPa.Whai muri i te tukunga o te wai wera, ka tukuna te mamaoa 0.3 MPa.Na, ko te hua kua horoia i runga i te mata tātari ka tangohia e te kirikiri ka tukuna ki waho o te miihini horoi.Ko nga hikoinga mai i te whangai i te slurry ki te tuku i te hua horoi ka mahia tonutia.Ko te hua o te ine ma te whakamahi i te momo whakamaroke whakamaroke wera, he 52.8%.Ko te hua horoi i tukuna mai i te tātari pehanga hurihuri i whakamarokehia ma te whakamahi i te whakamaroke hau i te 80° C., ka tukitukia i roto i te mira mira Victory mira kia whiwhi hydroxypropyl methylcellulose.
tono
Ka whakamahia tenei hua hei whakapakeke, whakamarara, here, emulsifier me te whakapumau i roto i te umanga pueru.Kei te whakamahia nuitia i roto i te kapia waihanga, petrochemical, ceramics, pepa, hiako, rongoa, kai, whakapaipai me etahi atu ahumahi.
Wā tuku: Nov-15-2022