HydroxyPropy cellulose (Hypromellose) yog ib qho dawb rau ntawm cov khoom siv dawb thiab insoluble nyob rau hauv dej kub zoo ib yam li cov methylolulose. HydroxyPropyl pab pawg thiab cov pab pawg methyl yog Ether Kev Sib Khwv thiab Cellulose muaj dab ntub dej ua ke, yog ib qho tsis yog ionic cellulose sib xyaw ether. Nws yog lub shatthetic semi-intive, StopSictic polymer nquag siv hauv ophthaltmology li cov roj nplua nyeem lossis ua kom muaj kev zam rau ntawm qhov ncauj
Kev npaj ntawm
KRAFT daim ntawv pulp nrog α-cellulose ntsiab lus ntawm 720ml / g thiab nruab nrab viscosity ntawm 2.6mm yog impregnated nyob rau hauv 40 ℃ rau 50 vib nas this. Lub tshwm sim pulp yog ces extruded kom tshem tawm cov tshaj ntawm 49% nao aique kev daws kom tau alkali cellulose. Qhov hnyav piv ntawm (49% NAOH hauv dej) rau (cov khoom siv hnyav (Naoh tivthaiv nyob rau hauv lub hauv paus cellulose) rau (cov khoom sib xyaw ua ke hauv purp) yog 1.49. Lub alkali cellulose (20kg) Yog li tau muab tso rau hauv ib lub jacketed siab reactor nrog lub tshuab pa hluav taws xob thiab tom qab ntawd nqus pa tawm kom pom cov pa ntawm tus reactor. Tom qab ntawd, qhov ntsuas kub nyob rau hauv tus reactor tau tswj hwm ntawm 60 ℃, thaum lub sijhawm sab hauv stirring yog nqa tawm. Tom qab ntawd, 2.4kg ntawm Dimethy ether tau ntxiv thiab ntsuas qhov sib ntxiv ntawm kev sib ntxiv ntawm (Nau-ees 1.97, thiab qhov ntsuas kub nyob rau hauv tus reactor tau tswj txij 80 ° C. Tom qab qhov kev sib ntxiv ntawm cov tshuaj ntsuab thiab cov kub nyob hauv cov tshuaj reactor tau tswj hwm los ntawm 80 ℃ rau 90 ℃. Tsis tas li ntawd, cov tshuaj tiv thaiv tau tswj hwm ntawm 90 ° C rau 20 feeb. Tom qab ntawd, cov roj ntsha tau tawm ntawm cov reactor, thiab cov crude hydroxypropyl methylopno methyl cellulose raug tshem tawm los ntawm reactor. Qhov kub ntawm crude hydroxypropyl methylulose yog 62 ℃ thaum nws tau raug tshem tawm. Ntsuas cov nru 50% particle loj nyob rau hauv lub cumulative qhov hnyav raws li qhov sib piv ntawm kev qhib hauv tsib lub ntxaij vab tshaus hauv tsib lub ntsej muag sib txawv. Raws li qhov tshwm sim, qhov nruab nrab particle loj ntawm cov ntxhib taw yog 6.2mm. Qhov tau txais ruas hydroxypropyl methylcellose tau nkag mus rau hauv kev txuas ntxiv biaader (KRC KNEADOSED 150RPM) Raws li ntsuas sib thooj siv tsib cov ntxaij nrog ntau qhov sib txawv, qhov nruab nrab particle loj yog 1.4mm. Cov Slurry tau txais los ntawm kev ntxiv dej kub ntawm 80 ° C rau decomposylen ffrothylulose methylropeny) rau (tag nrho cov nyiaj ntawm slurry) tau hloov mus rau 0.1. Lub slurry tau do ntawm ib qho kub tsis tu ncua ntawm 80 ° C rau 60 feeb. Tom qab ntawd, cov slurry yog muab rau rau lub siab lim dej nplua (bhs symthofen khoom) nrog kev sib hloov ceev ntawm 0.5 rpm thiab ua ntej-rhuab. Qhov kub ntawm cov slurry yog 93 ℃. Cov slurry yog muab los ntawm lub twj tso kua mis nrog kev tawm suab ntawm 0.2mpa. Qhov qhib loj ntawm lub rotary siab lim yog 80μm, thiab thaj chaw pom 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. Ncuav mog qab zib resulting tau pub nrog Chav ntawm 0.3MPA thiab dej kub ntawm 95 ° C rau kev ntxuav hydroxypropen thiab tom qab ntawd lim los ntawm lub lim. Cov dej kub tau muab los ntawm cov twj tso kua mis nrog kev tawm hws ntawm 0.2mpa. Tom qab dej kub yog muab, 0.3mpa ntawm chav yog muab khoom. Cov khoom lag luam uas cov khoom ntxuav ntawm cov taub lim yog tshem tawm los ntawm cov scraper thiab tawm ntawm cov washer. Cov txheej txheem txuas ntxiv los ntawm kev muab ntawm slurry rau qhov paug ntawm cov khoom ntxuav. Cov ntsiab lus dej ntawm cov khoom ntxuav tau yog 52.8% raws li ntsuas los ntawm cua sov kom qhuav hygrometer. Cov khoom lag luam uas tau tso tawm los ntawm cov huab cua siab lim tau qhuav siv cov cua sib txawv ntawm 80 ° CAV kom tau HydroxyPropyyl methylulose.
daim ntawv thov
Cov khoom no yog siv los ua cov neeg sawv cev thickening, 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: Feb-20-2025