Cellulose ether yog cov khoom sib txuas los ntawm cov xov xwm ntuj ntawm lub ntuj ntawm lub etherecification txheej txheem, thiab yog ib tug zoo siv dej thiab dej rov qab.
Kev Tshawb Nrhiav Kev Tshawb Fawb
Cellulose Cov neeg muaj kev hais ua ke tau siv dav hauv cov tshuaj khib nyiab tsis ntev los no, suav nrog methyl cellulose etherth cellulose ether (hemc ) Thiab hydroxypropyl methyl cellulose ether (HPMC). Nyob rau tam sim no, tsis muaj ntau cov lus nyob rau ntawm txoj kev ntsuas ntawm cov viscosity ntawm cellulose tshuaj ether. Nyob rau hauv peb lub teb chaws, tsuas yog qee cov qauv thiab cov monographs los ntawm txoj kev xeem ntawm cellulose ether daws.
Cov txheej txheem npaj ntawm cellulose ether cov tshuaj
Npaj ntawm methyl cellulose ether cov tshuaj
Methyl Cellulose muaj kev hais txog kev hais txog cellulose muaj cov metric pawg uas muaj cov methyl pawg nyob rau hauv molecule, xws li MC, HEMM thiab HPMC. Vim yog hydrophobicity ntawm cov methyl pawg, cov cellulose cov kev daws teeb meem muaj cov tshuaj methyl muaj cov dej kub ntawm qhov kub siab dua li lawv cov gelation kub (txog 60-80 ° C). Txhawm rau tiv thaiv cov cellulose ether tawm los ntawm kev tsim agglomerates, kub rau tawg mus rau hauv dej kub, ua kom cua sov thiab txias mus rau lub teeb Qhov kub, nws tuaj yeem npaj rau hauv cov khaub ncaws sib xyaw ether ether.
Solubility cov khoom ntawm cov pob zeb tsis zoo-me me kho me me
Txhawm rau kom tsis txhob muaj agglomeration ntawm cellulose hauv cov txheej txheem kev txiav txim siab, cov khoom lag luam qee zaum nqa cov khoom siv tshuaj pleev ib yam nkaus. Nws cov txheej txheem sib cais tshwm sim tom qab lub cellulose ether yog tag nrho dispersed, yog li nws tuaj yeem ua ncaj qha rau tus nqi hauv nruab nrab yam tsis muaj kev tsim agglomerates. Qhov siab dua tus nqi ntawm kev daws teeb meem, luv dua lub sijhawm ntawm lub cellulose ether nrog ncua cov khoom muaj me ntsis. Kho tus nqi PHU ntawm kev daws rau tus nqi siab dua. Alkalinity yuav tshem tawm cov solubility ncua ntawm lub cellulose ether, ua rau lub cellulose ether los ua agglomerates thaum yaj. Yog li no, tus nqi ntawm tus ntsuas yuav tsum tau tsa los yog txo qis tom qab lub cellulose ether yog tag nrho dispersed.
Cov khoom siv solubility ntawm cov methylcellulose-muaj cov neeg muaj kev nyab xeeb
Kev npaj ntawm hydroxyethyl cellulose ether cov tshuaj
Hydroxyethyl cellulose cellulose ether (HEC) daws tsis muaj qhov khoom ntawm thermal gelation, yog li ntawd, HEC tsis muaj kev kho deg kuj tseem yuav tsim agglomerates hauv dej kub. Cov chaw tsim tshuaj feem ntau ua cov tshuaj kho kom zoo li kev kho mob ntawm cov hmoov HEC kom nws tuaj yeem ua tau ncaj qha rau hauv cov nqi hauv qab dej txias uas tsis muaj cov qauv agglomerates. Ib yam li ntawd, nyob rau hauv kev daws nrog lub siab alkalinity, HEC nws kuj tseem tuaj yeem tsim agglomerates vim solubility poob. Txij li thaum Maas slurry yog alkaline tom qab kev daws teeb meem yog nyob nruab nrab ntawm 12 thiab 13, kev sib cais ntawm cov ceg xis kheej hauv txoj kev ntseeg Mement kuj tseem nrawm heev.
Cov khoom siv solubility ntawm cov npoo-kho hec
Xaus thiab Kev Ntsuam Xyuas
1. Txheej txheem txheej txheem
Txhawm rau kom tsis txhob muaj kev cuam tshuam zoo rau lub sijhawm kuaj vim yog cov kev kho mob qeeb rau cov tshuaj dej saum npoo av, nws raug nquahu kom siv cov dej kub rau kev npaj.
2. Cov txheej txheem txias
Cellulose ether cov kev daws yuav tsum tau do thiab txias ntawm qhov kub kub kom txo lub sijhawm txias, uas yuav tsum tau ncua sij hawm xeem.
3. Stirring txheej txheem
Tom qab lub cellulose ether yog ntxiv rau cov dej kub, nco ntsoov ua kom nplawm. Thaum cov dej kub poob qis dua hauv qab gel kub, lub cellulose ether yuav pib yaj, thiab kev daws teeb meem yuav maj mam dhau los ua viscous. Nyob rau lub sijhawm no, lub nrawm dua yuav tsum tau txo. Tom qab kev daws kev ncav cuag ib qho viscosity, nws xav tau sawv ntsug ntxiv rau ntau tshaj 10 teev ua ntej lub npuas maj mam ntab mus rau saum npoo kom tawg thiab ploj.
Pa cua bubbles hauv cellulose ether cov tshuaj
4. Hydrating cov txheej txheem
Qhov zoo ntawm cellulose ether thiab dej yuav tsum tau ntsuas kom raug, thiab sim tsis tos kom daws tau cov viscosity ntau dua ua ntej cov dej.
5. Viscosity Test
Vim yog lub thixotrotropy ntawm cellulopose ether daws, thaum kuaj nws viscomais, thaum lub rotor ntawm cov kev daws teeb meem, nws yuav cuam tshuam kev daws teeb meem thiab kev ntsuas cov txiaj ntsig. Yog li ntawd, tom qab lub rotor tau tso rau hauv kev daws teeb meem, nws yuav tsum tau tso cai sawv ntsug rau 5 feeb ua ntej kev sim.
Lub sij hawm ncua: Mar-22-2023