Hydroxyethyl methyl cellulose HEMCsiv tau ua tus neeg sawv cev tiv thaiv colloid, emulsifier thiab dispersant vim nws lub luag haujlwm ua haujlwm ntawm qhov chaw hauv cov kua dej. Ib qho piv txwv ntawm nws daim ntawv thov yog raws li nram no: Cov nyhuv ntawm hydroxyethyl methyl cellulose rau cov yam ntxwv ntawm cement. Hydroxyethyl methylcellulose yog cov hmoov dawb tsis muaj ntxhiab, tsis muaj saj, tsis muaj tshuaj lom uas yaj hauv dej txias los ua cov kua ntshiab, viscous. Nws muaj cov yam ntxwv ntawm kev ua kom tuab, khi, tawg, emulsifying, zaj duab xis-tsim, suspending, adsorbing, gelling, surfactant, khaws cia noo noo thiab tiv thaiv colloids. Vim yog lub luag haujlwm ua haujlwm ntawm qhov chaw ntawm cov kua dej, nws tuaj yeem siv ua tus neeg sawv cev tiv thaiv colloid, emulsifier thiab dispersant. Hydroxyethyl methyl cellulose aqueous kua muaj hydrophilicity zoo thiab yog tus neeg sawv cev ua haujlwm siab.
npaj
Ib txoj kev npaj hydroxyethyl methyl cellulose, txoj kev no suav nrog kev siv paj rwb ua cov khoom siv raw thiab ethylene oxide ua tus neeg sawv cev etherifying los npajhydroxyethyl methyl celluloseCov khoom siv raw rau kev npaj hydroxyethyl methyl cellulose yog npaj ua ntu raws li qhov hnyav: 700-800 qhov ntawm cov tshuaj sib xyaw ntawm toluene thiab isopropanol ua cov kuab tshuaj, 30-40 qhov dej, 70-80 qhov ntawm sodium hydroxide, 80-85 qhov ntawm paj rwb refined, 20-28 qhov ntawm oxyethane, 80-90 qhov ntawm methyl chloride, thiab 16-19 qhov ntawm glacial acetic acid; cov kauj ruam tshwj xeeb yog:
Kauj ruam thawj zaug, hauv lub reactor, ntxiv toluene thiab isopropanol sib tov, dej, thiab sodium hydroxide, ua kom sov txog li 60 ～ 80 ℃, thiab muab tso rau hauv lub tshuab ua kom sov li 20 ～ 40 feeb;
Kauj ruam thib ob, alkalization: txias cov ntaub ntawv saum toj no rau 30 ～ 50 ℃, ntxiv paj rwb zoo, tsuag cov tshuaj toluene thiab isopropanol nrog cov kuab tshuaj, tshem tawm mus rau 0.006Mpa, sau nrog nitrogen rau 3 qhov hloov pauv, thiab nqa tawm alkali tom qab hloov pauv Cov xwm txheej alkalization yog raws li nram no: lub sijhawm alkalization yog 2 teev, thiab qhov kub alkalization yog 30 ° C txog 50 ° C;
Kauj ruam thib peb, etherification: qhov alkalization tiav lawm, lub reactor raug tshem tawm mus rau 0.05 ～ 0.07MPa, ethylene oxide thiab methyl chloride ntxiv, thiab khaws cia rau 30 ～ 50 feeb; thawj theem ntawm etherification: 40 ～ 60 ℃, 1.0 ～ 2.0 teev, lub siab raug tswj ntawm 0.150.3Mpa; theem ob ntawm etherification: 60 ～ 90 ℃, 2.0 ～ 2.5 teev, lub siab raug tswj ntawm 0.40.8Mpa;
Kauj ruam 4, kev ua kom tsis muaj zog: ntxiv cov kua qaub glacial acetic acid ua ntej rau lub lauj kaub dej nag, nias rau hauv cov khoom siv etherified rau kev ua kom tsis muaj zog, ua kom sov 75 ～ 80 ℃ kom ua kom nag los, qhov kub nce mus txog 102 ℃, thiab tus nqi pH kuaj pom yog 68 Thaum nag los ua tiav, lub tank nag los puv nrog cov dej kais kho los ntawm lub cuab yeej osmosis rov qab ntawm 90 ℃ ～ 100 ℃;
Kauj ruam thib tsib, kev ntxuav centrifugal: cov khoom siv hauv kauj ruam thib plaub yog centrifuged los ntawm lub centrifuge ntsia hlau kab rov tav, thiab cov khoom sib cais raug xa mus rau lub lauj kaub ntxuav uas muaj dej kub ua ntej, thiab cov khoom siv raug ntxuav;
Kauj ruam thib rau, kev ziab centrifugal: cov khoom ntxuav raug thauj mus rau hauv lub tshuab ziab khaub ncaws los ntawm lub tshuab centrifuge kab rov tav, cov khoom raug ziab ntawm 150-170 ° C, thiab cov khoom qhuav raug pulverized thiab ntim.
Piv nrog rau qhov uas twb muaj lawmcellulose etherSiv cov thev naus laus zis ntau lawm, qhov kev tsim kho tshiab no siv ethylene oxide ua tus neeg sawv cev etherifying los npaj hydroxyethyl methyl cellulose, thiab muaj peev xwm tiv thaiv kab mob mildew zoo vim nws muaj hydroxyethyl pawg, Kev ruaj khov viscosity zoo thiab tiv thaiv kab mob mildew thaum lub sijhawm khaws cia ntev. Siv tau hloov lwm cov cellulose ethers.
Lub sijhawm tshaj tawm: Plaub Hlis-25-2024