noj 11

xov xwm

Hydroxypropyl methyl cellulose HPMC cov txheej txheem thiab kev siv

Hydroxypropyl methyl cellulose HPMC, tseem hu ua hydroxypromellose, yog ib qho dawb mus rau dawb cellulose ether hmoov los yog granule uas muaj dej txias solubility thiab dej kub insolubility zoo ib yam li methyl cellulose.Hydroxypropyl pawg thiab methyl pawg yog ether daim ntawv cog lus thiab anhydrous qabzib nplhaib ntawm cellulose ua ke, yog ib hom non-ionic cellulose tov ether.Nws yog ib qho khoom siv hluav taws xob, tsis muaj zog, viscoelastic polymer feem ntau siv los ua cov roj nplua nyeem hauv ophthalmology, lossis ua ib qho khoom siv lossis cov khoom siv hauv cov tshuaj hauv qhov ncauj.

1. Cov txheej txheem ntau lawm

Kraft pulp nrog αcellulose cov ntsiab lus ntawm 97%, intrinsic viscosity ntawm 720mL / g thiab nruab nrab fiber ntau ntev ntawm 2.6 hli yog soaked nyob rau hauv 49% NaOH tov ntawm 40 ℃ rau 50 vib nas this.Tom qab ntawd lub pulp raug extruded kom tshem tawm ntau tshaj 49% NaOH tov kom tau alkali cellulose.Qhov hnyav piv ntawm (49% NaOH aqueous tov) rau (khoom tivthaiv ntawm pulp) nyob rau hauv impregnation kauj ruam yog 200. Qhov hnyav piv ntawm NaOH nyob rau hauv alkali cellulose rau khoom hauv pulp yog 1.49.Cov alkali cellulose yog li tau txais (20kg) yog muab tso rau hauv lub jacked siab reactor nrog rau sab hauv agitation, ces nqus tsev vacuumized thiab purged nrog nitrogen kom txaus tshem tawm oxygen los ntawm lub reactor.Tom qab ntawd, qhov kub thiab txias hauv lub reactor tau tswj ntawm 60 ℃ thaum lub tshuab nqus tsev ua haujlwm.

Tom qab ntawd 2.4kg dME tau ntxiv thiab qhov kub thiab txias hauv lub reactor raug tswj mus rau 60 ℃.Tom qab qhov sib ntxiv ntawm dimethyl ether, methylene chloride tau ntxiv los ua cov molar piv ntawm methylene chloride rau NaOH hauv alkaline cellulose 1.3, propylene oxide tau ntxiv los ua kom qhov hnyav piv ntawm propylene oxide rau cov khoom hauv cov ntaub so ntswg 1.97, thiab qhov kub ntawm lub reactor. tau tswj los ntawm 60 ℃ to 80 ℃.Tom qab ntxiv chloromethane thiab propylene oxide, qhov kub ntawm lub reactor raug tswj los ntawm 80 ℃ to 90 ℃.Tsis tas li ntawd, cov tshuaj tiv thaiv tau kav ntev li 20 feeb ntawm 90 ℃.

Cov roj yog tom qab ntawd ntws los ntawm lub reactor thiab cov crude hydroxypropyl methyl cellulose raug tshem tawm ntawm lub reactor.Qhov kub ntawm crude hydroxypropyl methyl cellulose yog 62 ℃.Ntsuas qhov loj ntawm 50% particle loj nyob rau hauv cumulative hnyav raws li particle loj faib raws li qhov sib piv ntawm crude hydroxypropyl methyl cellulose los ntawm qhov qhib ntawm tsib sieving, txhua tus muaj qhov sib txawv qhib loj.

Yog li ntawd, qhov nruab nrab particle loj ntawm coarse hais yog 6.2mm.Cov tau txais crude hydroxypropyl methyl cellulose tau nkag mus rau hauv ib lub tshuab biaxial txuas ntxiv (KRC kneader S1, L / D = 10.2, sab hauv ntim 0.12 L, kev sib hloov ceev 150rpm) ntawm qhov ceev ntawm 10kg / hr, thiab decomposed crude hydroxypropyl methyl cellulose tau txais.Raws li kev ntsuas zoo sib xws siv 5 cov ntxaij vab tshaus nrog qhov sib txawv ntawm qhov qhib, qhov nruab nrab particle loj yog 1.4 hli.Ntxiv 80 ℃ dej kub rau cov decomposed crude hydroxypropyl methyl cellulose nyob rau hauv lub tank nrog kub tswj ntawm lub tsho.Tus nqi ntawm qhov hnyav piv ntawm decomposed crude hydroxypropyl methyl cellulose rau tag nrho cov nyiaj ntawm cov slurry yog 0.1, thiab cov slurry yog tau.Cov slurry tau nplawm ntawm qhov kub thiab txias ntawm 80 ℃ rau 60 feeb.

Tom qab ntawd, cov slurry yog nkag mus rau qhov kev sib hloov ceev ntawm 0.5 RPM thiab pre-heated rotary siab lim (BHS Sonthofen khoom).Qhov kub ntawm grout yog 93 ℃.Siv lub twj tso kua mis los muab slurry, lub twj tso kua mis tawm siab yog 0.2mpa.Qhov qhib qhov loj ntawm lub tshuab lim siab yog 80μm, thiab qhov chaw lim yog 0.12m2.Lub slurry nkag mus rau lub tshuab nqus tsev siab yog lim los ntawm lub lim thiab hloov mus rau hauv lub ncuav mog qab zib lim.Lub resulting lim ncuav mog qab zib yog muab nrog 0.3mpa chav thiab 95 ℃ dej kub nrog ib tug hnyav piv ntawm 10.0 rau cov khoom tivthaiv ntawm HYDROXYpropyl methyl cellulose ntxuav, uas yog ces lim los ntawm lub lim.

Cov dej kub yog muab los ntawm lub twj tso kua mis ntawm qhov tso tawm siab ntawm 0.2mpa.Tom qab muab dej kub, 0.3mpa chav yog muab.Tom qab ntawd, tom qab ntxuav cov khoom raug tshem tawm los ntawm lub tshuab lim dej los ntawm cov scraper thiab tawm ntawm lub tshuab ntxhua khaub ncaws.Cov kauj ruam los ntawm kev muab cov slurry mus rau kev tso tawm cov khoom ntxuav yog ua tsis tu ncua.Raws li kev ntsuas siv lub tshav kub - ziab hygrometer, cov dej ntsiab lus ntawm cov khoom ntxuav yog li tawm yog 52.8%.Cov khoom ntxuav tawm tawm los ntawm lub tshuab lim dej tau qhuav los ntawm lub tshuab ziab khaub ncaws ntawm 80 ℃, thiab crushed hauv lub zeb Victory kom tau hydroxypropyl methyl cellulose.

2.Adaim ntawv thov

HPMC cov khoom siv los ua thickener, dispersant, binder, emulsifier thiab stabilizer hauv kev lag luam textile.Kuj tseem siv dav hauv cov khoom siv hluavtaws, petrochemical, ceramic, ntawv, tawv, tshuaj, khoom noj khoom haus, tshuaj pleev ib ce thiab lwm yam lag luam.


Post lub sij hawm: Mar-23-2022