Cellulose ether yog ib qho polymer compound synthesized los ntawm cellulose ntuj los ntawm cov txheej txheem etherification, thiab yog ib qho thickener zoo heev thiab dej retention agent.
Keeb Kwm Kev Tshawb Fawb
Xyoo tas los no, cov cellulose ethers tau siv dav hauv cov mortar qhuav sib xyaw, feem ntau siv yog qee cov cellulose ethers tsis-ionic, suav nrog 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 hais txog txoj kev ntsuas ntawm viscosity ntawm cellulose ether kua. Hauv peb lub tebchaws, tsuas yog qee cov qauv thiab monographs teev cov txheej txheem sim ntawm viscosity ntawm cellulose ether kua.
Txoj kev npaj ntawm cellulose ether kua
Kev Npaj ntawm Methyl Cellulose Ether Solution
Methyl cellulose ethers xa mus rau cellulose ethers uas muaj methyl pawg hauv molecule, xws li MC, HEMC thiab HPMC. Vim yog hydrophobicity ntawm methyl pawg, cov cellulose ether cov kua uas muaj methyl pawg muaj cov khoom thermal gelation, uas yog, lawv tsis yaj hauv dej kub ntawm qhov kub siab dua lawv qhov kub gelation (kwv yees li 60-80 ° C). Txhawm rau tiv thaiv cov kua cellulose ether los ntawm kev tsim cov agglomerates, cua sov dej saum nws qhov kub gel, kwv yees li 80 ~ 90 ° C, tom qab ntawd ntxiv cov hmoov cellulose ether rau hauv dej kub, do kom tawg, khaws do thiab txias mus rau qhov kub teem, nws tuaj yeem npaj rau hauv cov kua cellulose ether sib xws.
Cov yam ntxwv ntawm kev yaj ntawm cov ethers uas tsis tau kho saum npoo av methylcellulose
Yuav kom tsis txhob muaj kev sib sau ua ke ntawm cellulose ether thaum lub sijhawm yaj, cov chaw tsim khoom qee zaum ua cov tshuaj kho saum npoo ntawm cov khoom hmoov cellulose ether kom ncua kev yaj. Nws cov txheej txheem yaj tshwm sim tom qab cellulose ether tawg tag, yog li nws tuaj yeem tawg ncaj qha rau hauv dej txias nrog tus nqi pH nruab nrab yam tsis tsim cov agglomerates. Tus nqi pH siab dua ntawm cov tshuaj, lub sijhawm yaj ntawm cellulose ether luv dua nrog cov khoom yaj qeeb. Kho tus nqi pH ntawm cov tshuaj kom muaj tus nqi siab dua. Alkalinity yuav tshem tawm qhov kev yaj qeeb ntawm cellulose ether, ua rau cellulose ether tsim cov agglomerates thaum yaj. Yog li ntawd, tus nqi pH ntawm cov tshuaj yuav tsum tau tsa lossis txo qis tom qab cellulose ether tawg tag.
Cov yam ntxwv ntawm kev yaj ntawm cov ethers uas muaj methylcellulose uas tau kho saum npoo av
Kev Npaj ntawm Hydroxyethyl Cellulose Ether Solution
Hydroxyethyl cellulose ether (HEC) cov kua tsis muaj cov khoom ntawm thermal gelation, yog li ntawd, HEC yam tsis muaj kev kho saum npoo kuj tseem yuav tsim cov agglomerates hauv dej kub. Cov chaw tsim khoom feem ntau ua cov tshuaj kho saum npoo ntawm hmoov HEC kom ncua kev yaj, yog li nws tuaj yeem ncaj qha mus rau hauv dej txias nrog tus nqi pH nruab nrab yam tsis tsim cov agglomerates. Ib yam li ntawd, hauv cov kua nrog alkalinity siab, HEC kuj tseem tuaj yeem tsim cov agglomerates vim qhov kev poob qeeb solubility. Txij li thaum cov cement slurry yog alkaline tom qab hydration thiab tus nqi pH ntawm cov kua yog ntawm 12 thiab 13, qhov kev yaj ntawm cov cellulose ether kho saum npoo hauv cov cement slurry kuj ceev heev.
Cov khoom siv solubility ntawm HEC kho qhov chaw
Xaus Lus thiab Kev Tshawb Fawb
1. Cov txheej txheem tawg
Yuav kom tsis txhob muaj cov teebmeem tsis zoo rau lub sijhawm xeem vim yog qhov qeeb ntawm cov tshuaj kho qhov chaw, nws raug pom zoo kom siv dej kub rau kev npaj.
2. Cov txheej txheem txias
Cov tshuaj cellulose ether yuav tsum tau do thiab txias ntawm qhov kub thiab txias kom txo qhov txias, uas yuav tsum tau siv sijhawm sim ntev dua.
3. Cov txheej txheem sib xyaw
Tom qab ntxiv cov cellulose ether rau hauv dej kub, nco ntsoov do tas li. Thaum qhov kub ntawm dej poob qis dua qhov kub ntawm gel, cov cellulose ether yuav pib yaj, thiab cov tshuaj yuav maj mam ua viscous. Lub sijhawm no, qhov ceev ntawm kev do yuav tsum txo qis. Tom qab cov tshuaj mus txog qee qhov viscosity, nws yuav tsum sawv ntsug rau ntau tshaj 10 teev ua ntej cov npuas maj mam ntab mus rau saum npoo kom tawg thiab ploj mus.
Cov Npuas Cua hauv Cellulose Ether Solution
4. Cov txheej txheem ua kom dej noo
Yuav tsum ntsuas qhov zoo ntawm cellulose ether thiab dej kom raug, thiab sim tsis txhob tos kom cov tshuaj viscosity siab dua ua ntej ntxiv dej.
5. Kev sim viscosity
Vim yog lub thixotropy ntawm cellulose ether kua, thaum kuaj nws cov viscosity, thaum lub rotor ntawm lub rotational viscometer raug ntxig rau hauv cov kua, nws yuav cuam tshuam cov kua thiab cuam tshuam rau cov txiaj ntsig ntsuas. Yog li ntawd, tom qab lub rotor raug ntxig rau hauv cov kua, nws yuav tsum tau tso cai rau sawv rau 5 feeb ua ntej kuaj.
Lub sijhawm tshaj tawm: Lub Peb Hlis-22-2023