Qingdao Tianya Chemical Co Ltd

Sodium Carboxymethyl Cellulose uses
Sodium Carboxymethyl Cellulose uses
Sodium Carboxymethyl Cellulose is used in food industry as a kind of viscosity modifier and thickener, stabilize emulsions in various products including ice cream. As a food ingredient, it’s E number is E466. Sodium Carboxymethyl Cellulose is also a constituent of many non-food products, such as personal lubricants, toothpaste, laxatives, diet pills, water-based paintings, detergents, textile sizing, and various paper products. Sodium Carboxymethyl Cellulose is used primarily because it has high viscosity, is nontoxic, and is generally considered to be hypoallergenic as the major source fiber is either softwood pulp or cotton linter. Sodium Carboxymethyl Cellulose is used extensively in gluten free and reduced fat food products. In laundry detergents, Sodium Carboxymethyl Cellulose is used as a soil suspension polymer designed to deposit onto cotton and other cellulosic fabrics, creating a negatively charged barrier to soils in the wash solution. Sodium Carboxymethyl Cellulose is used as a lubricant in nonvolatile eye drops, artificial tears. Sometimes, methyl cellulose is used, but its nonpolar methyl groups (-CH3) do not add any solubility or chemical reactivity to base cellulose.

Following the initial reaction, the resultant mixture produces about 60% Sodium Carboxymethyl Cellulose plus 40% salts (sodium chloride and sodium glycolate). This product is the so-called technical CMC which is used in detergents. A further purification process is used to remove these salts to produce the pure Sodium Carboxymethyl Cellulose used for food, pharmaceutical, and toothpaste applications. An intermediate "semipurified" grade is also produced, typically used in paper applications.  
Sodium Carboxymethyl Cellulose is also used in pharmaceuticals as a thickening agent, and in oil drilling industry as an ingredient of drilling mud, where it acts as a viscosity modifier and water retention agent. Polyanionic cellulose derived from cellulose is also used in oilfield practice. Sodium Carboxymethyl Cellulose is both chemically and physically distinguished from polyanionic cellulose. CMC is definitely a carboxylic acid, where PAC is an ether. Although CMC and PAC are manufactured from the same raw materials, by adjusting the type of cellulose and stoichiometry of the reactants, different final products may be produced. The primary difference between the CMC and PAC production processes is in the radicalization step.

Insoluble microgranular Sodium Carboxymethyl Cellulose is used as a cation-exchange resin in ion-exchange chromatography for purification of proteins. Presumably, the level of derivatization is much lower, so the solubility properties of microgranular cellulose are retained, while adding sufficient negatively charged carboxylate groups to bind to positively charged proteins.
Sodium Carboxymethyl Cellulose is also used in ice packs to form a eutectic mixture resulting in a lower freezing point, and therefore more cooling capacity than ice.
Aqueous solutions of Sodium Carboxymethyl Cellulose have also been used to disperse carbon nanotubes. The long Sodium Carboxymethyl Cellulose molecules are thought to wrap around the nanotubes, allowing them to be dispersed in water. In conservation-restoration, it is used as an adhesive or fixative.

Sodium Carboxymethyl Cellulose is used to achieve tartrate or cold stability in wine. This innovation may save megawatts of electricity used to chill wine in warm climates. It is more stable than metatartaric acid and is very effective in inhibiting tartrate precipitation. It is reported that KHT crystals, in presence of Sodium Carboxymethyl Cellulose, grow slower and change their morphology. Their shape becomes flatter because they lose 2 of the 7 faces, changing their dimensions. Sodium Carboxymethyl Cellulose molecules, negatively charged at wine pH, interact with the electropositive surface of the crystals, where potassium ions are accumulated. The slower growth of crystals and modification of their shape are caused by the competition between Sodium Carboxymethyl Cellulose molecules and bitartrate ions for binding to the KHT crystals.