Qhov txawv ntawm CMC thiab MHEC

Carboxymethylcellulose (CMC) thiab Methyl hydroxyethyl cellulose (MHEC) yog ob hom cellulose derivatives uas tau siv dav hauv ntau yam lag luam. Lawv qhia qee qhov zoo sib xws hauv lawv cov qauv tshuaj thiab lub cev, tab sis lawv kuj muaj qee qhov sib txawv tseem ceeb uas ua rau lawv tsim nyog rau kev siv sib txawv. Hauv tsab ntawv no, peb yuav tshawb nrhiav qhov sib txawv ntawm CMC thiab MHEC.

Chemical Structure
Ob leeg CMC thiab MHEC yog cellulose derivatives uas yog dej-soluble polymers. CMC yog muab los ntawm cellulose los ntawm reacting nws nrog chloroacetic acid los qhia carboxymethyl pawg, thaum MHEC yog muab los ntawm cellulose los ntawm reacting nws nrog ethylene oxide thiab methyl chloride los qhia methyl thiab hydroxyethyl pawg.

Solubility
Ib qho ntawm qhov sib txawv tseem ceeb ntawm CMC thiab MHEC yog lawv 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, MHEC yog tsawg soluble nyob rau hauv dej tshaj CMC thiab feem ntau yuav tsum tau siv cov kuab tshuaj, xws li ethanol los yog isopropyl cawv, kom yaj tag.

viscosity
Ob leeg CMC thiab MHEC tuaj yeem ua kom cov kua dej ntau ntxiv thiab ua kom muaj viscosity. Txawm li cas los xij, CMC muaj viscosity ntau dua li MHEC, thiab nws tuaj yeem tsim cov gel zoo li sib xws 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. MHEC, ntawm qhov tod tes, muaj viscosity qis dua CMC thiab feem ntau yog siv los ua cov thickener lossis rheology hloov kho hauv cov ntawv thov uas yuav tsum muaj cov kua nplaum tsawg.

pH stability
CMC feem ntau ruaj khov dua li qhov dav ntawm pH qhov tseem ceeb tshaj MHEC. 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, MHEC muaj 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 MHEC muaj kev ruaj khov nyob rau ntau qhov kub thiab txias, tab sis muaj qhov sib txawv ntawm lawv cov thermal stability. CMC muaj thermally ruaj khov dua MHEC 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. MHEC, 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 MHEC 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. MHEC 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.

Hauv kev xaus, CMC thiab MHEC yog ob lub cellulose derivatives uas qhia qee qhov zoo sib xws hauv lawv cov qauv tshuaj thiab lub cev tab sis muaj qhov sib txawv ntawm lawv cov solubility, viscosity, pH stability, kub stability, thiab kev siv.