Hydroxyethyl methyl cellulose HEMC tuaj yeem siv los ua tus neeg sawv cev tiv thaiv colloid, emulsifier thiab dispersant vim nws qhov chaw ua haujlwm hauv cov kua dej.Ib qho piv txwv ntawm nws daim ntawv thov yog raws li nram no: Cov nyhuv ntawm hydroxyethyl methyl cellulose ntawm cov khoom ntawm cov cement.Hydroxyethyl methylcellulose yog ib qho tsis muaj ntxhiab, tsis qab, tsis muaj kuab lom dawb hmoov uas yaj hauv dej txias los tsim cov kua dej ntshiab.Nws muaj cov yam ntxwv ntawm thickening, khi, dispersing, emulsifying, zaj duab xis-forming, suspending, adsorbing, gelling, nto-active, khaws cia noo noo thiab tiv thaiv colloids.Vim yog lub ntsej muag ua haujlwm ntawm cov tshuaj aqueous, nws tuaj yeem siv los ua cov tshuaj tiv thaiv colloid, emulsifier thiab dispersant.Hydroxyethyl methyl cellulose aqueous tov muaj hydrophilicity zoo thiab yog ib tug high-efficiency water-retaining agent.
npaj
Ib txoj hauv kev los npaj hydroxyethyl methyl cellulose, txoj kev suav nrog siv cov paj rwb zoo li cov khoom siv raw thiab ethylene oxide ua tus neeg sawv cev etherifying los npaj hydroxyethyl methyl cellulose.Cov khoom siv raw rau kev npaj hydroxyethyl methyl cellulose yog npaj rau hauv qhov hnyav: 700-800 qhov sib xyaw ntawm toluene thiab isopropanol ua cov kuab tshuaj, 30-40 feem ntawm dej, 70-80 feem ntawm sodium hydroxide, 80-85 feem ntawm refined paj rwb, 20-28 qhov chaw ntawm oxyethane, 80-90 qhov chaw ntawm methyl chloride, thiab 16-19 qhov chaw ntawm glacial acetic acid;cov kauj ruam tshwj xeeb yog:
Thawj kauj ruam, nyob rau hauv lub reactor, ntxiv toluene thiab isopropanol sib tov, dej, thiab sodium hydroxide, ua kom sov li 60 ~ 80 ℃, yuav incubated 20 ~ 40 feeb;
Qhov thib ob theem, alkalization: txias cov ntaub ntawv saum toj no rau 30 ~ 50 ℃, ntxiv cov paj rwb refined, tshuaj tsuag cov sib tov ntawm toluene thiab isopropanol nrog hnyav, khiav tawm mus rau 0.006Mpa, sau nrog nitrogen rau 3 hloov, thiab nqa tawm alkali tom qab hloov lub alkalization. Cov xwm txheej yog raws li nram no: lub sij hawm alkalization yog 2 teev, thiab alkalization kub yog 30 ° C mus rau 50 ° C;
Qhov thib peb kauj ruam, etherification: alkalization tiav, lub reactor yog evacuated 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 tswj ntawm 0.150.3Mpa;theem ob ntawm etherification: 60 ~ 90 ℃, 2.0 ~ 2.5 teev, lub siab tswj ntawm 0.40.8Mpa;
Kauj ruam 4, neutralization: ntxiv metered glacial acetic acid ua ntej rau nag los nag, nias rau hauv cov khoom siv etherified rau neutralization, kub txog 75 ~ 80 ℃ los ua dej nag, qhov kub nce mus rau 102 ℃, thiab nrhiav pH tus nqi yog 68 Thaum nag lossis daus tiav, lub tank los nag yog ntim nrog cov kais dej kho los ntawm cov khoom siv rov qab osmosis ntawm 90 ℃ ~ 100 ℃;
Kauj ruam tsib, centrifugal ntxuav: cov khoom nyob rau hauv lub thib plaub kauj ruam yog centrifuged los ntawm ib tug kab rov tav ntsia hlau centrifuge, thiab cov khoom sib cais yog xa mus rau ib tug ntxhua khaub ncaws uas muaj dej kub ua ntej, thiab cov khoom yog ntxuav;
Kauj ruam thib rau, centrifugal ziab: cov khoom ntxuav yog thauj mus rau hauv lub tshuab ziab khaub ncaws los ntawm kab rov tav ntsia hlau centrifuge, cov khoom yog qhuav ntawm 150-170 ° C, thiab cov khoom qhuav yog pulverized thiab ntim.
Piv nrog rau cov uas twb muaj lawm cellulose ether ntau lawm technology, tam sim no invention txais ethylene oxide raws li etherifying tus neeg sawv cev los npaj hydroxyethyl methyl cellulose, thiab muaj zoo anti-mildew muaj peev xwm vim hais tias nws muaj hydroxyethyl pawg, zoo viscosity stability thiab mildew kuj thaum lub sij hawm ntev cia.Nws tuaj yeem siv los hloov lwm cov cellulose ethers.
Post lub sij hawm: Sep-26-2022