Cellulose ethers yog dab tsi

Cellulose ethers yog ib tsev neeg ntawm cov tshuaj sib xyaw ua ke tau los ntawm cellulose, ib yam khoom ntuj tsim muaj nyob rau hauv cov phab ntsa ntawm tes ntawm cov nroj tsuag. Cov derivatives no yog tsim los ntawm kev hloov tshuaj lom neeg ntawm cellulose molecules los qhia ntau pawg ua haujlwm, ua rau muaj ntau yam khoom thiab kev siv. Cellulose ethers feem ntau yog siv rau hauv kev lag luam xws li kev tsim kho, tshuaj, khoom noj, tshuaj pleev ib ce, thiab kev saib xyuas tus kheej vim lawv ntau yam xwm txheej thiab cov txiaj ntsig zoo. Nov yog qee hom cellulose ethers thiab lawv siv:

1. Methyl Cellulose (MC):
   • Methyl cellulose yog tsim los ntawm kev kho cellulose nrog methyl chloride.
   • Nws yog soluble nyob rau hauv dej thiab cov ntaub ntawv ntshiab, viscous daws.
   • MC yog siv los ua cov thickener, binder, thiab stabilizer hauv cov khoom siv (xws li, cement-based mortars, gypsum-based plasters), cov khoom noj khoom haus, tshuaj, thiab cov khoom tu tus kheej.
2. Hydroxyethyl Cellulose (HEC):
   • Hydroxyethyl cellulose yog synthesized los ntawm reacting cellulose nrog ethylene oxide los qhia hydroxyethyl pawg.
   • Nws yog soluble nyob rau hauv dej thiab cov ntaub ntawv ntshiab, viscous daws nrog zoo heev dej tuav cov khoom.
   • HEC feem ntau yog siv los ua cov thickener, rheology modifier, thiab zaj duab xis-tsim tus neeg sawv cev hauv cov xim, cov nplaum, cov khoom tu tus kheej, thiab tshuaj.
3. Hydroxypropyl Methyl Cellulose (HPMC):
   • Hydroxypropyl methyl cellulose yog tsim los ntawm kev qhia hydroxypropyl thiab methyl pawg mus rau hauv cov pob txha cellulose.
   • Nws nthuav tawm cov khoom zoo ib yam li ob qho tib si methyl cellulose thiab hydroxyethyl cellulose, nrog rau cov dej solubility, muaj peev xwm ua zaj duab xis, thiab tuav dej.
   • HPMC yog siv dav hauv cov ntaub ntawv tsim kho (xws li, cov nplaum nplaum, cov cement-based renders, self-leveling compounds), nrog rau hauv cov tshuaj, khoom noj khoom haus, thiab cov khoom tu tus kheej.
4. Carboxymethyl Cellulose (CMC):
   • Carboxymethyl cellulose yog muab los ntawm cellulose los ntawm kev kho nws nrog sodium hydroxide thiab monochloroacetic acid los qhia carboxymethyl pawg.
   • Nws yog soluble nyob rau hauv dej thiab cov ntaub ntawv ntshiab, viscous daws nrog zoo heev thickening, stabilizing, thiab dej tuav cov khoom.
   • CMC feem ntau yog siv los ua cov thickener, binder, thiab rheology modifier hauv cov khoom noj, tshuaj, textiles, ntawv, thiab qee yam khoom siv.

Cov no yog qee qhov feem ntau siv cellulose ethers, txhua tus muaj cov khoom tshwj xeeb thiab kev siv thoob plaws ntau yam lag luam. Lwm yam tshwj xeeb cellulose ethers kuj tseem muaj, haum rau cov kev cai tshwj xeeb hauv kev siv sib txawv.