Qhov txawv ntawm CMC thiab HEMC

Carboxymethylcellulose (CMC) thiab Hydroxyethyl methylcellulose (HEMC) yog ob hom cellulose derivatives feem ntau siv nyob rau hauv ntau yam lag luam, nrog rau cov zaub mov thiab tshuaj industries. Ob leeg CMC thiab HEMC yog cov dej-soluble polymers uas tau los ntawm cellulose, tab sis lawv muaj cov khoom sib txawv thiab siv rau kev siv sib txawv. Hauv tsab ntawv no, peb yuav tshawb txog qhov sib txawv ntawm CMC thiab HEMC.

Chemical Structure
Cov qauv tshuaj ntawm CMC thiab HEMC zoo ib yam, vim tias ob qho tib si yog cov derivatives ntawm cellulose. CMC yog tsim los ntawm reacting cellulose nrog chloroacetic acid los tsim carboxymethyl pawg, thaum HEMC yog tsim los ntawm reacting cellulose nrog ethylene oxide thiab methyl chloride los tsim hydroxyethyl thiab methyl pawg.

Solubility
Ib qho ntawm qhov sib txawv tseem ceeb ntawm CMC thiab HEMC yog lawv cov solubility hauv dej. CMC yog soluble hauv dej heev thiab tuaj yeem tsim cov kua dej ntshiab, kua nplaum txawm tias tsis tshua muaj siab. Nyob rau hauv sib piv, HEMC yog tsawg soluble nyob rau hauv dej tshaj CMC thiab feem ntau yuav tsum tau siv ib tug hnyav, xws li ethanol los yog isopropyl cawv, kom yaj tag.

viscosity
Lwm qhov sib txawv tseem ceeb ntawm CMC thiab HEMC yog lawv cov viscosity. CMC yog nkig heev thiab tuaj yeem tsim cov kua nplaum zoo li cov kua nplaum thaum yaj hauv dej. Qhov no ua rau CMC zoo tagnrho rau siv rau hauv daim ntawv thov uas yuav tsum tau thickening lossis gelling, xws li hauv kev lag luam khoom noj rau kev ua kua ntses thiab hnav khaub ncaws. Nyob rau hauv sib piv, HEMC muaj ib tug qis viscosity tshaj CMC thiab feem ntau yog siv raws li ib tug thickener los yog rheology modifier nyob rau hauv daim ntawv thov uas yuav tsum tau ib tug tsawg viscous tov.

pH stability
CMC feem ntau ruaj khov dua li qhov dav ntawm pH qhov tseem ceeb tshaj HEMC. CMC yog ruaj khov nyob rau hauv ob qho tib si acidic thiab alkaline ib puag ncig, uas ua rau nws zoo tagnrho rau siv nyob rau hauv cov zaub mov kev lag luam, qhov twg pH qhov tseem ceeb yuav txawv. Hauv qhov sib piv, HEMC yog qhov ruaj khov nyob rau hauv me ntsis acidic rau nruab nrab pH ib puag ncig thiab tuaj yeem tawg ntawm cov nqi pH siab dua.

Kub stability
Ob leeg CMC thiab HEMC yog ruaj khov nyob rau hauv ntau qhov kub thiab txias, tab sis muaj qhov sib txawv ntawm lawv cov thermal stability. CMC muaj thermally ruaj khov dua HEMC thiab tuaj yeem tswj nws cov khoom ntawm qhov kub thiab txias. Qhov no ua rau CMC zoo tagnrho rau kev siv hauv cov ntawv thov uas muaj qhov kub thiab txias, xws li hauv kev tsim cov khoom ci. HEMC, ntawm qhov tod tes, muaj qhov thermal stability qis dua CMC thiab tuaj yeem tawg ntawm qhov kub siab dua.

Daim ntawv thov
Ob leeg CMC thiab HEMC tau siv ntau yam kev siv thoob plaws kev lag luam sib txawv. CMC feem ntau yog siv los ua cov thickener, stabilizer, thiab emulsifier hauv kev lag luam khoom noj rau cov khoom xws li dej khov, kua ntses, thiab hnav khaub ncaws. Nws kuj yog siv nyob rau hauv kev lag luam kws tshuaj raws li ib tug binder, disintegrant, thiab suspending agent. HEMC feem ntau yog siv los ua thickener, binder, thiab rheology modifier hauv kev tsim kho kev lag luam rau cov khoom xws li xim, coatings, thiab adhesives. Nws kuj yog siv nyob rau hauv kev lag luam kws tshuaj raws li ib tug binder, disintegrant, thiab sustained-tso tus neeg sawv cev.