HEMC hydroxyethyl methyl cellulose ntau lawm txheej txheem

HEMC hydroxyethyl methyl cellulose ntau lawm txheej txheem

Hydroxyethyl methyl cellulose HEMC tuaj yeem siv los ua tus neeg saib xyuas kev tiv thaiv colloidal, emulsifier thiab dispersant vim nws cov dej ua haujlwm hauv cov kua dej. Cov nyhuv ntawm hydroxyethyl methyl cellulose ntawm cov khoom cement. Hydroxyethyl methyl cellulose yog cov tshuaj tsw qab, tsis muaj ntxhiab, tsis muaj tshuaj lom cov hmoov dawb uas yaj hauv dej txias los tsim cov pob tshab, nplaum. Nrog thickening, adhesion, dispersion, emulsification, zaj duab xis tsim, ncua kev kawm ntawv, adsorption, gelling, deg kev ua si, dej tuav thiab colloid tiv thaiv, thiab lwm yam. Dej tov yuav siv tau raws li colloid tiv thaiv, emulsifier thiab dispersant vim nws nto active muaj nuj nqi. Hydroxyethyl methyl cellulose aqueous tov muaj hydrophilicity zoo thiab yog cov dej tuav tus neeg sawv cev zoo.

HEMCtxheej txheem ntau lawm

Lub invention nthuav tawm ib txoj kev npaj rau hydroxyethyl methyl cellulose, uas siv cov paj rwb refined li raw khoom thiab ethylene oxide raws li etherifying tus neeg sawv cev los npaj hydroxyethyl methyl cellulose. Cov khoom siv raw rau kev npaj hydroxyethyl methyl cellulose los ntawm qhov hnyav yog: toluene thiab isopropanol sib tov 700 ~ 800 qhov hnyav, 30 ~ 40 qhov dej, sodium hydroxide 70 ~ 80 qhov chaw, ua kom zoo nkauj paj rwb 80 ~ 85 qhov chaw, ethylene oxide 20 ~ 28. qhov chaw, methane chloride 80 ~ 90 qhov chaw, glacial acetic acid 16 ~ 19 qhov chaw; Cov kauj ruam tshwj xeeb yog raws li nram no:

Thawj kauj ruam yog ntxiv toluene thiab isopropyl cawv sib tov, dej, thiab sodium hydroxide nyob rau hauv cov tshuaj tiv thaiv kettle, kub txog 60 ~ 80 ℃, tuav rau 20 ~ 40 feeb;

Qhov thib ob kauj ruam, alkalization: cov khoom yog txias rau 30 ~ 50 ℃, refined paj rwb, toluene thiab isopropyl cawv sib tov tshuaj solvent, nqus mus rau - 0.006mpa, ntim nrog nitrogen rau 3 zaug hloov, hloov alkalization, alkalization tej yam kev mob: alkalization sij hawm. yog 2 teev, alkalization kub yog 30 ℃ -50 ℃;

Qhov thib peb kauj ruam, etherification: tom qab alkalization, lub reactor tau nqus mus rau 0.05-0.07mpa, thiab ethylene oxide thiab methane chloride tau ntxiv rau 30-50 feeb. Thawj theem ntawm etherification: 40 ~ 60 ℃, 1.0 ~ 2.0Hour, lub siab tswj ntawm 0.15 0.3mpa; Qhov thib ob theem ntawm etherification: 60 ~ 90 ℃, 2.0 ~ 2.5 teev, tswj siab ntawm 0.4- 0.8mpa;

Kauj ruam 4, neutralization: ntxiv ntsuas glacial acetic acid nyob rau hauv lub desolvation reactor ua ntej, nias rau hauv cov khoom etherized rau neutralization, kub nce mus rau 75 ~ 80 ℃ rau desolvation, kub nce mus rau 102 ℃, PH nrhiav tau 6-8 Yog qhov tiav. ntawm kev tawg; Sau 90 ℃ ~ 100 ℃ rov qab osmosis ntsia tau kho cov kais dej hauv lub dessolubilization kettle;

Qhov thib tsib kauj ruam, centrifugal ntxuav: theem plaub ntawm cov khoom siv los ntawm kab rov tav kauv centrifuge centrifugal sib cais, sib cais ntawm cov ntaub ntawv xa mus rau lub pre-filled dej kub ntxhua khaub ncaws, cov khoom siv ntxuav;

Kauj ruam thib rau, centrifugal ziab: cov khoom tom qab ntxuav yog xa mus rau hauv lub tshuab ziab khaub ncaws los ntawm kab rov tav kauv centrifuge, thiab cov khoom yog qhuav ntawm 150 ~ 170 ℃. Cov khoom qhuav yog crushed thiab ntim.

Piv nrog rau cov khoom siv technology uas twb muaj lawm ntawm cellulose ether, lub invention siv ethylene oxide ua etherification tus neeg sawv cev los npaj hydroxyethyl methyl cellulose, uas muaj hydroxyethyl pawg, muaj mildew tsis kam, zoo viscosity stability thiab mildew kuj thaum khaws cia rau ntev. Yuav siv tau los hloov lwm cov cellulose ether.