Cellulose ether yog ib tug polymer compound synthesized los ntawm ntuj cellulose los ntawm etherification txheej txheem, thiab yog ib tug zoo heev thickener thiab dej tuav tus neeg saib xyuas.
Cellulose ethers tau dav siv nyob rau hauv qhuav sib tov mortar nyob rau hauv xyoo tas los no, feem ntau lug siv yog ib co non-ionic cellulose ethers, xws li methyl cellulose ether (MC), hydroxyethyl cellulose ether (HEC), hydroxyethyl cellulose ether Methyl cellulose ether (HEMC ) thiab hydroxypropyl methyl cellulose ether (HPMC). Tam sim no, tsis muaj ntau cov ntaub ntawv nyob rau hauv txoj kev ntsuas ntawm viscosity ntawm cellulose ether tov. Nyob rau hauv peb lub teb chaws, tsuas yog ib co qauv thiab monographs stipulate lub xeem txoj kev ntawm lub viscosity ntawm cellulose ether tov.
Kev npaj ntawm Methyl Cellulose Ether Solution
Methyl cellulose ethers xa mus rau cellulose ethers uas muaj methyl pawg hauv cov molecule, xws li MC, HEMC thiab HPMC. Vim yog hydrophobicity ntawm pawg methyl, cov cellulose ether daws uas muaj methyl pawg muaj thermal gelation zog, uas yog, lawv yog insoluble nyob rau hauv dej kub ntawm qhov kub siab tshaj lawv gelation kub (kwv yees li 60-80 ° C). Txhawm rau tiv thaiv cov cellulose ether daws los ntawm kev tsim cov agglomerates, cua sov cov dej saum toj no nws cov gel kub, txog 80 ~ 90 ° C, tom qab ntawd ntxiv cov cellulose ether hmoov rau hauv dej kub, do kom disperse, stirring thiab txias mus rau lub teeb. qhov kub thiab txias, nws tuaj yeem npaj rau hauv ib qho kev daws teeb meem cellulose ether.
Txhawm rau kom tsis txhob muaj cov agglomeration ntawm cellulose ether thaum lub sij hawm dissolution txheej txheem, manufacturers tej zaum kuj nqa tawm tshuaj deg kev kho mob ntawm cov hmoov cellulose ether cov khoom kom ncua dissolution. Nws cov txheej txheem dissolution tshwm sim tom qab cov cellulose ether yog tag nrho dispersed, yog li nws yuav tsum tau ncaj qha dispersed nyob rau hauv dej txias nrog ib tug nruab nrab pH nqi yam tsis muaj kev tsim agglomerates. Qhov siab dua tus nqi pH ntawm cov tshuaj, lub sij hawm luv luv ntawm cov cellulose ether nrog rau ncua sij hawm dissolution zog. Kho tus nqi pH ntawm cov tshuaj mus rau tus nqi siab dua. Alkalinity yuav tshem tawm qhov ncua sij hawm solubility ntawm cellulose ether, ua rau cellulose ether tsim agglomerates thaum dissolving. Yog li ntawd, tus nqi pH ntawm cov tshuaj yuav tsum tau tsa los yog qis dua tom qab cellulose ether tau tawg tag.
Kev npaj ntawm Hydroxyethyl Cellulose Ether Solution
Hydroxyethyl cellulose ether (HEC) cov tshuaj tsis muaj cov cuab yeej ntawm thermal gelation, yog li ntawd, HEC tsis muaj kev kho deg yuav tsim cov agglomerate hauv dej kub. Cov neeg tsim khoom feem ntau ua cov tshuaj kho qhov chaw ntawm cov hmoov HEC kom ncua kev sib cais, kom nws tuaj yeem ncaj qha mus rau hauv dej txias nrog tus nqi nruab nrab pH yam tsis tsim cov agglomerates. Ib yam li ntawd, nyob rau hauv ib qho kev daws teeb meem nrog lub siab alkalinity, HEC Nws kuj tuaj yeem tsim cov agglomerates vim qeeb solubility poob. Txij li thaum cov cement slurry yog alkaline tom qab hydration thiab pH tus nqi ntawm cov tshuaj yog nyob nruab nrab ntawm 12 thiab 13, lub dissolution tus nqi ntawm nto-kho cellulose ether nyob rau hauv cov cement slurry kuj ceev heev.
Xaus thiab Kev Ntsuam Xyuas
1. Cov txheej txheem dispersion
Txhawm rau kom tsis txhob muaj kev cuam tshuam tsis zoo rau lub sijhawm sim vim qhov kev sib cais qeeb ntawm cov tshuaj kho deg, nws raug nquahu kom siv dej kub rau kev npaj.
2. Cov txheej txheem txias
Cellulose ether daws yuav tsum tau nplawm thiab txias ntawm ambient kub kom txo tau qhov txias txias, uas yuav tsum tau ncua sij hawm xeem.
3. stirring txheej txheem
Tom qab cov cellulose ether ntxiv rau cov dej kub, nco ntsoov kom nplawm. Thaum cov dej kub poob qis dua qhov kub ntawm gel, cellulose ether yuav pib yaj, thiab cov tshuaj yuav maj mam ua kua. Thaum lub sij hawm no, lub stirring ceev yuav tsum tau txo. Tom qab cov tshuaj ncav cuag ib qho viscosity, nws yuav tsum tau sawv ntsug rau ntau tshaj 10 teev ua ntej cov npuas maj mam ntab mus rau saum npoo kom tawg thiab ploj.
4. Hydrating txheej txheem
Qhov zoo ntawm cellulose ether thiab dej yuav tsum tau ntsuas kom raug, thiab sim tsis txhob tos rau qhov kev daws kom ncav cuag viscosity siab dua ua ntej cov dej ntxiv.
5. Kev ntsuas viscosity
Vim yog thixotropy ntawm cellulose ether tov, thaum kuaj nws cov viscosity, thaum lub rotor ntawm lub viscometer rotor yog muab tso rau hauv cov tshuaj, nws yuav cuam tshuam cov kev daws teeb meem thiab cuam tshuam cov kev ntsuas. Yog li ntawd, tom qab lub rotor muab tso rau hauv qhov kev daws teeb meem, nws yuav tsum tau tso cai sawv ntsug rau 5 feeb ua ntej kuaj.
Post lub sij hawm: Feb-24-2023