Hydroxypropyl methylcellulose (Hypromellose), inozivikanwawo se hypromellose, ichena kusvika kune-white cellulose poda kana granule, ine hunhu hwekunyungudika mumvura inotonhora uye isinganyungudika mumvura inopisa yakafanana nemethyl cellulose. Iro hydroxypropyl boka neboka remethyl zvinosanganiswa neanhydrous glucose ring ye cellulose ne ether bond, inova rudzi rwe-non-ionic cellulose yakasanganiswa ether. Iyo semisynthetic, isingashande, viscoelastic polymer inowanzoshandiswa semafuta ekuzora muophthalmology, kana semubatsiri kana mota mumishonga yemuromo.
kugadzirira
Mashizha epepa re kraft pulp akawanikwa kubva mupine huni ane alpha cellulose zviri 97%, intrinsic viscosity ye 720 ml/g, uye avhareji yefiber kureba ye2.6 mm yakanyudzwa mu49% NaOH aqueous solution pa40°C. 50 seconds; iyo pulp yakazosvinwa kuti ibvise yakawandisa 49% aqueous NaOH kuwana alkali cellulose. Chiyero chehuremu che (49% NaOH aqueous solution) kusvika (yakasimba yezvinyorwa mu pulp) munhanho ye impregnation yaiva 200. Uremu hwehuwandu hwe (iyo NaOH zvinyorwa mu alkali cellulose yakawanikwa) uye (yakasimba mukati mepulp) yaiva 1.49. Iyo alkali cellulose yakawanikwa (20 kg) yakaiswa mujaketi rekumanikidza reactor ine mukati mekusimudzira, ndokuzoburitswa uye kucheneswa nenitrogen kuti ibvise zvakakwana okisijeni kubva kune reactor. Tevere, kubvongodza kwemukati kwakaitwa uchidzora tembiricha mu reactor kusvika 60°C. Zvadaro, 2.4 kg ye dimethyl ether yakawedzerwa, uye tembiricha mu reactor yakadzorwa kuti ichengetwe pa60 ° C. Mushure mekuwedzera dimethyl ether, wedzera dichloromethane kuitira kuti molar ratio ye (dichloromethane) ku (NaOH chikamu mu alkaline cellulose) iite 1.3, uye wedzera propylene oxide kugadzira (propylene oxide) uye (mu pulp) Huremu hwehuwandu hwehuwandu hwakasimba) yakashandurwa kuita 1.97, nepo tembiricha mureactor yakadzorwa kubva pa60°C kusvika 80°C. Mushure mekuwedzera kwemethyl chloride uye propylene oxide, tembiricha mu reactor yakadzorwa kubva pa80 ° C kusvika 90 ° C. Uyezve, kuita kwakapfuuridzirwa pa90 ° C kwemaminitsi makumi maviri. Ipapo, gasi rakaburitswa kubva kune reactor, uye iyo isina kuchena hydroxypropyl methylcellulose yakaburitswa kubva mureactor. Tembiricha ye crude hydroxypropyl methylcellulose panguva yekutorwa yaive 62 degreesC. Iyo yakawedzera 50% saizi yechikamu mukugovera saizi zvichienderana nehuremu hwekuwedzera hwakatarwa zvichienderana nereshiyo ye crude hydroxypropyl methylcellulose inopfuura nepamaburi emasefa mashanu, sefa yega yega ine saizi yekuvhura yakasiyana, yakayerwa. Nekuda kweizvozvo, avhareji saizi yezvikamu zvakakora yaive 6.2 mm. Iyo yakawanikwa crude hydroxypropyl methylcellulose yakaiswa mune inoenderera biaxial kneader (KRC kneader S1, L / D = 10.2, mukati vhoriyamu 0.12 litita, rotational kumhanya 150 rpm) pamwero we10 kg / hr, uye kuora kwakawanikwa. ye crude hydroxypropyl methylcellulose. Hukuru hwepakati hwaive 1.4 mm sekuyerwa zvakafanana uchishandisa masefa mashanu akasiyana ekuvhura. Kune yakaora crude hydroxypropyl methylcellulose mutangi ine jekete kutonga tembiricha, wedzera mvura inopisa pa80 ° C muhuwandu hwakadai kuti ( Huremu hwehuwandu hwehuwandu hweselulosi) kusvika (huwandu hwehuwandu hwe slurry) hwakashandurwa kuita 0.1, uye slurry yakawanikwa. Iyo slurry yakasimudzwa pane imwe nguva tembiricha ye80 ° C kwemaminitsi makumi matanhatu. Zvadaro, slurry yakadyiswa mu preheated rotary pressure filter (chigadzirwa cheBHS-Sonthofen) ine kutenderera kwekutenderera kwe0.5 rpm. Tembiricha yeslurry yaive 93°C. Iyo slurry yaipihwa pachishandiswa pombi, uye kuyerera kwepombi yaive 0.2 MPa. Saizi yekuvhura yesefa ye rotary pressure filter yaive 80 μm, uye nzvimbo yekusefa yaive 0.12 m2. Iyo slurry inopihwa kune inotenderera pressure sefa inoshandurwa kuita keke yekusefa nekusefa. Mushure mekupa mutsi we0.3 MPa kukeke rakawanikwa, mvura inopisa pa95 ° C yakapihwa muhuwandu zvekuti huremu hwe (mvura inopisa) kusvika (yakasimba yehydroxypropyl methylcellulose mushure mekugezwa) yaive 10.0, Zvadaro, sefa nepakati. sefa. Mvura inopisa yaipihwa nepombi pamhepo yekuburitsa 0.2 MPa. Mushure mokunge mvura inopisa yapiwa, steam ye 0.3 MPa yakapiwa. Zvadaro, chigadzirwa chakagezwa pamusoro pesefa chinobviswa ne-scraper uye chinobudiswa kunze kwemuchina wekugeza. Matanho kubva pakudyisa slurry kusvika pakubvisa chigadzirwa chakashambidzwa anoitwa nguva dzose. Nekuda kwekuyerwa uchishandisa kupisa kuomesa mhando hygrometer, mvura yemukati yechigadzirwa chakagezwa saka yakaburitswa yaive 52.8%. Chigadzirwa chakagezwa chakaburitswa kubva ku rotary pressure sefa chakaomeswa ne air dryer pa 80° C., uye chakapushwa muchigayo chekukunda kuti chiwane hydroxypropyl methylcellulose.
application
Ichi chigadzirwa chinoshandiswa se thickener, dispersant, binder, emulsifier uye stabilizer muindasitiri yemachira. Inoshandiswawo zvakanyanya mukugadzira resin, petrochemical, ceramics, bepa, dehwe, mushonga, chikafu, cosmetics uye mamwe maindasitiri.
Nguva yekutumira: Nov-15-2022