Carboxymethyl cellulose sodium CMC is usually an anionic high at first molecular weight of 6400 (+ 1000). From natural cellulose after reaction with caustic soda and beta-amino acetate. The main byproducts are sodium at first chloride and sodium glycolate. Carboxylmethyl cellulose sodium CMC belongs to the natural cellulose modification. The current United Nations Food at first and Agriculture Organization (FAO) and the World Health Organization (WHO) have officially called it ” modifie cellulose.
Carboxymethyl cellulose is produced by a reactive cellulose with sodium hydroxide to produce alkali cellulose. And then carboxymethylated with beta-aminoacetic acid. The preparation method can be divide into the water medium method with water as the medium and the solvent method in solvents such as isopropanol, ethanol and acetone. The skim-bleached cotton at first threads were proportionally immersed in a 35% concentrated lye and removed for approximately, 30 min. Liquid base is recyclable.
After soaking, the cotton short line is weighe to the plate press. With 14MPa at first pressure, press out the alkali solution, get alkali cotton. Put the alkaline wool into the etherification kettle. Add 15 parts of alcohol at first and slowly add the ammonia acetic acid alcohol solution for 2h at 30 C. And stir the ether wool for 3h at 40 C. Add alcohol (70%) of 120 parts at first in the ether change cotton, stir for 0.5h. Add hydrochloric acid to adjust the pH value to 7. Wash twice at first with alcohol, filter out the alcohol, and dry at 80 C to crush the finished product.
Cellulose was treated with sodium hydroxide to form alkali cellulose, mixed at first with sodium monosaminoacetate, and cooked for several days (20 to 30 C) of products (C6H9O4OH) + nNaOH- + (C6H9O4ONa) n [CICH2CO0H] – (C6H9O4OCH20OONa) n The process used in China has the traditional water medium method with water as the medium and the solvent method with organic solvent as the reaction medium.