Sodium carboxymethyl cellulose (CMC), yomwe imadziwikanso kuti carboxymethyl cellulose. Ndi polymer cellulose ether yokonzedwa ndi kusintha kwachilengedwe kwa cellulose, ndipo mawonekedwe ake amapangidwa makamaka ndi mayunitsi a D-glucose olumikizidwa ndi β_(14) glycosidic bond.
CMC ndi woyera kapena yamkaka woyera fibrous ufa kapena granules ndi kachulukidwe wa 0.5g/cm3, pafupifupi zoipa, odorless ndi hygroscopic.
Carboxymethyl cellulose ndi yosavuta kumwazikana, imapanga njira yowonekera ya colloidal m'madzi, ndipo imasungunuka mu zosungunulira za organic monga ethanol.
Pamene pH>10, pH mtengo wa 1% wamadzimadzi amadzimadzi ndi 6.5≤8.5.
Zomwe zimachitika kwambiri ndi izi: cellulose yachilengedwe imapangidwa ndi alkali ndi NaOH, kenako chloroacetic acid imawonjezeredwa, ndipo haidrojeni pagulu la hydroxyl pagawo la shuga imakhudzidwa ndi gulu la carboxymethyl mu chloroacetic acid.
Zitha kuwoneka kuchokera pamapangidwe kuti pali magulu atatu a hydroxyl pagawo lililonse la shuga, omwe ndi C2, C3 ndi C6 hydroxyl magulu, ndipo digirii yolowa m'malo ya haidrojeni pagulu la hydroxyl la glucose imayimiridwa ndi zizindikiro zakuthupi ndi zamankhwala.
Ngati ma hydrogen pamagulu atatu a hydroxyl pagawo lililonse amasinthidwa ndi magulu a carboxymethyl, ndiye kuti kuchuluka kwa m'malo kumatanthauzidwa ngati 7-8, ndikusintha kwakukulu kwa 1.0 (kalasi yazakudya imatha kukwaniritsa digiri iyi). Mlingo wa m'malo CMC mwachindunji zimakhudza solubility, emulsification, thickening, bata, asidi kukana ndi mchere kukana CMC.
Mukamagwiritsa ntchito zinthu za CMC, tiyenera kumvetsetsa bwino magawo akuluakulu a index, monga kukhazikika, kukhuthala, kukana kwa asidi, kukhuthala, etc.
Kumene, ntchito zosiyanasiyana ntchito carboxymethyl mapadi, chifukwa pali mitundu yambiri ya mamasukidwe akayendedwe kamene kamakhala pa carboxymethyl cellulose, ndi zizindikiro thupi ndi mankhwala ndi osiyana. Podziwa izi, mutha kudziwa momwe mungasankhire chinthu choyenera.
Nthawi yotumiza: Nov-07-2022