HydroxyPropy cellulose Holmc, tseem hu ua Hydroxypromellose, yog xim dawb rau ntawm cov dej txias thiab dej kub instlomility zoo ib yam li me me mis cellulose. Hydroxypropyl pab pawg yog Etheryl pab pawg thiab muaj kuab lom nplhaib ntawm cellule cellulose sib xyaw ether. Nws yog lub shatthetic, tsis voos, peelsictictic polymer nquag siv los ua cov tshuaj nplua nyeem, lossis raws li kev zam lossis qhov tsis zoo rau cov tshuaj.
1. Cov txheej txheem ntau lawm
Kraft pulp nrog αcellulose cov ntsiab lus ntawm 97%, intrinsic viscosity ntawm 720mm tau tsau rau hauv 40 ℃ rau 50 vib nas this. Tom qab ntawd lub pulp tau extruded kom tshem tawm cov tshaj 49% NAA kev daws teeb meem kom tau txais alkali cellulose. Qhov hnyav piv ntawm (49% naoous daws) rau (cov khoom siv hnyav yog 200. Qhov hnyav piv rau cov nqaij mos yog 1.49. Lub alkali cellulose yog li tau (20kg) muab tso rau hauv ib jacked siab reactor nrog cov nitrogen kom pom meej kom muaj oxygen los ntawm reactor. Tom qab ntawd, qhov ntsuas kub nyob rau hauv cov reactor tau tswj hwm ntawm 60 ℃ thaum lub sijhawm stirring tau nqa tawm.
Tom qab ntawd 2.4kG DME tau ntxiv thiab qhov ntsuas kub nyob rau hauv reactor tau tswj hwm mus rau 60 ℃. Tom qab ntxiv rau ntawm darethyl ether, methylene chloride tau ntxiv los ua kom cov roj ntsha cellulge 1.3, thiab qhov kub nyob rau hauv cov tshuaj ntsuab yog tswj tau los ntawm 60 ℃ mus rau 80 ℃. Tom qab ntxiv chloromethane thiab propylene oxide, qhov kub nyob rau hauv reactor tau tswj los ntawm 80 ℃ rau 90 ℃. Tsis tas li ntawd, cov tshuaj tiv thaiv kav ntev li 20 feeb ntawm 90 ℃.
Cov roj yog tom qab ntawd nqus tau los ntawm cov reactor thiab cov crude hydroxypropyl methylropy cellulose raug tshem tawm los ntawm reactor. Qhov kub ntawm crude hydroxypropyl methyl cellulose yog 62 ℃. Ntsuas cov nru 50% particle loj hauv qhov kev faib tawm ntawm cov regrokypropyl metylropy los ntawm tsib sieving, txhua tus muaj qhov chaw sib txawv.
Raws li qhov tshwm sim, qhov nruab nrab particle loj ntawm ntxhib hais yog 6.2 hli. Cov tau txais ruas hydroxypropyl cellulose tau qhia rau hauv kev txuas ntxiv biaader (KRC KNEADE 150 Raws li qhov tshwm sim ntawm cov lus pom zoo sib xws uas siv 5 cov ntxaij nrog kev qhib ntau ntau, qhov nruab nrab qhov loj me yog 1.4mm. Ntxiv 80 ℃ dej kub rau lub decomposed ras fydrothpropyl methylropy cellulose hauv lub tank nrog kub tswj ntawm lub tsho. Tus nqi ntawm qhov hnyav piv ntawm cov decomposed corrosed hydroxypropyl cellulose rau tag nrho cov sutterry yog 0.1, thiab cov slurry tau txais. Lub slurry tau do ntawm ib qho kub tsis tu ncua ntawm 80 ℃ rau 60 feeb.
Tom qab ntawd, cov slurry yog muab rau kev sib hloov ceev ntawm 0.5 RPM thiab ua ntej-rhuab cov khoom siv siab (bhs symthofen khoom). Qhov kub ntawm grout yog 93 ℃. Siv lub twj tso kua mis kom muab cov slurry, twj tso kua mis tawm hluav taws xob yog 0.2mpa. Qhov qhib loj ntawm lub rotary siab lim yog 80μm, thiab lub taub muaj taub hau yog 0.12m2. Lub slurry tso rau rau lub siab rotary siab lim yog lim los ntawm lub lim thiab hloov mus rau hauv cov lim ncuav mog qab zib. Lub lim lim ncuav mog qab zib yog muab nrog 0.3mpa ci thiab 95 ℃ cov dej kub nrog lub cev yuag ntawm 10.0
Dej kub tau muab los ntawm lub twj tso kua mis ntawm qhov tawm ntawm 0.2mpa. Tom qab dej kub yog muab khoom, 0.3mpa ua pa. Tom qab ntawd, tom qab ntxuav cov khoom raug tshem tawm ntawm lub lim saum npoo los ntawm cov scraper thiab tawm ntawm lub tshuab ntxhua khaub ncaws. Cov kauj ruam los ntawm kev muab cov slurry los tso tawm cov khoom ntxuav tau nqa tawm tsis tu ncua. Raws li kev ntsuas siv cua sov - ziab khaub ncaws - ziab keej - cov ntsiab lus dej ntawm cov khoom siv ntxuav tawm yog 52.8%. Cov khoom lag luam uas tau tso tawm los ntawm lub siab rotary lim tau qhuav los ntawm huab cua tshuab ziab khaub ncaws 80 ℃, thiab tsoo hauv HydroxyPropy cellulose.
2.applrication
HPMC cov khoom yog siv los ua cov thickener, dispersant, binder, emulsifier thiab stabilizer nyob rau hauv textile kev lag luam. Kuj tseem dav siv nyob rau hauv hluav taws xob cob, petrochemical, ceramic, ntawv, tawv, tshuaj, khoom noj, cov tshuaj pleev zaub mov, tshuaj lom neeg thiab lwm yam tshuaj lom neeg.
Lub Sijhawm Post: Mar-23-2022