Dab tsi yog Cellulose ethers

Cellulose ethers yog ib tsev neeg ntawm cov tshuaj lom neeg uas tau los ntawm cellulose, ib qho polymer ntuj pom nyob rau hauv cov phab ntsa cell ntawm cov nroj tsuag. Cov derivatives no yog tsim los ntawm kev hloov kho tshuaj ntawm cov cellulose molecules los qhia ntau yam pab pawg ua haujlwm, ua rau muaj ntau yam khoom thiab daim ntawv thov. Cellulose ethers feem ntau 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 qhov xwm txheej ntau yam thiab cov khoom muaj txiaj ntsig. 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 hauv dej thiab tsim cov kua ntshiab, viscous.
   • MC siv ua cov khoom ua kom tuab, cov khoom sib txuas, thiab cov khoom ruaj khov hauv cov ntaub ntawv siv hauv kev tsim kho (piv txwv li, cov cement-based mortars, gypsum-based plasters), cov khoom noj, tshuaj, thiab cov khoom siv tu tus kheej.
2. Hydroxyethyl Cellulose (HEC):
   • Hydroxyethyl cellulose yog synthesized los ntawm reacting cellulose nrog ethylene oxide los qhia cov hydroxyethyl pawg.
   • Nws yog soluble nyob rau hauv dej thiab tsim cov kua ntshiab, viscous nrog cov khoom zoo heev retention.
   • HEC feem ntau yog siv los ua cov khoom siv thickener, rheology modifier, thiab zaj duab xis-forming tus neeg sawv cev hauv cov xim, cov nplaum, cov khoom siv tu tus kheej, thiab cov tshuaj.
3. Hydroxypropyl Methyl Cellulose (HPMC):
   • Hydroxypropyl methyl cellulose yog tsim los ntawm kev qhia hydroxypropyl thiab methyl pawg rau ntawm cellulose backbone.
   • Nws muaj cov khoom zoo ib yam li methyl cellulose thiab hydroxyethyl cellulose, suav nrog kev yaj dej, muaj peev xwm tsim zaj duab xis, thiab khaws dej.
   • HPMC siv dav hauv cov ntaub ntawv siv hauv kev tsim kho (piv txwv li, cov nplaum rau pobzeb, cov cement-based renders, cov tshuaj sib xyaw ua ke), nrog rau hauv cov tshuaj, cov khoom noj, thiab cov khoom siv 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 cov carboxymethyl pawg.
   • Nws yog soluble nyob rau hauv dej thiab tsim cov kua ntshiab, viscous nrog zoo heev thickening, stabilizing, thiab dej retention zog.
   • CMC feem ntau yog siv ua cov khoom siv tuab, cov khoom sib txuas, thiab cov khoom hloov pauv rheology hauv cov khoom noj, tshuaj, textiles, ntawv, thiab qee cov ntaub ntawv siv hauv kev tsim kho.

Cov no yog qee cov cellulose ethers uas siv ntau tshaj plaws, txhua tus muaj cov yam ntxwv thiab kev siv tshwj xeeb thoob plaws ntau yam lag luam. Lwm cov cellulose ethers tshwj xeeb kuj tseem muaj, tsim rau cov kev xav tau tshwj xeeb hauv ntau daim ntawv thov.