Sodium Carboxymethyl Cellulose (CMC)

Sodium carboxymethylcellulose (CMC) is a cellulose derivative and an ionic cellulose gum, which is widely used in various industrial fields due to its unique properties of thickening, suspension, adhesion and water retention.

Depending on the purity, sodium carboxymethylcellulose is white or light yellow powder, easily soluble in cold and hot water. Sodium carboxymethyl cellulose is divided into various types according to the degree of substitution, solution viscosity and purity. Heating sodium carboxymethyl cellulose solution, the viscosity of sodium carboxymethyl cellulose decreases with increasing temperature. As long as the temperature does not exceed 50°C, this effect is reversible, because the alkaline substances in the solution will cause the degradation of sodium carboxymethyl cellulose if kept at a higher temperature for a long time.

Solution viscosity remains normal over a wide pH range, but is most stable in the pH 7-9 range. As the pH decreases, the solution becomes acidified. Carboxymethylcellulose sodium will gradually change from salt form to water-insoluble acid form and precipitate out of solution. When the pH value is lower than 4, most of the salt form turns into the acid form, forming a three-dimensional network structure to precipitate. Generally speaking, the higher the DS value of sodium carboxymethyl cellulose, the better the compatibility with salts. Adding salt to carboxymethylcellulose sodium solution is more effective than dissolving it in brine.

Sodium carboxymethyl cellulose is generally divided into three grades according to the purity: high-purity food grade (more than 99.5% content), industrial grade (more than 90% content), and crude product (more than 65% content). According to viscosity (molecular weight), it is divided into high viscosity (1% solution viscosity is 5000-8500Pa·S), medium viscosity (1% solution viscosity is 1000-5000Pa·S), low viscosity (1% solution viscosity is 5-1000Pa·S) S). Therefore, sodium carboxymethyl cellulose is available in a wide variety, suitable for the requirements of various applications.

Application of Carboxymethyl Cellulose Sodium in Food Industry

Sodium carboxymethyl cellulose is used as an additive in food, and has the functions of thickening, suspending, emulsifying, stabilizing, film forming, and acid resistance. It can replace guar gum, gelatin, agar, sodium alginate and pectin in food production, and is widely used in modern food industry, such as cold products, solid beverages, fruit juices, jams, yogurt drinks, condiments, instant noodles, etc. Bakery products and meat products.

In yogurt, sodium carboxymethylcellulose can prevent the aggregation and precipitation of milk protein, make it uniformly dispersed and suspended, maintain the stability of food quality, extend the shelf life of food, and adapt to commonly used sterilization processes such as UHT and pasteurization. Recommended dosage 0.3%-0.5%.

Used in ice cream, it can prevent the growth of ice crystals, improve expansion rate, anti-melting, shaping, and taste; in instant noodles, it can increase the toughness and cooking resistance of noodles; in biscuits and pancakes, it has good formability, smooth surface, and is not easy Crushing; in bread and cakes, sodium carboxymethylcellulose can control the viscosity of the batter and improve the water retention and storability of baked products.

Compared with other similar products, it has the advantages of fast dissolution speed, good fluidity of solution, uniform molecular distribution, large volume specific gravity, high acid resistance, high salt resistance, high transparency, less free cellulose, and less gel.

Toothpaste Grade Sodium Carboxymethyl Cellulose

Sodium carboxymethyl cellulose is mainly used as a thickener in toothpaste to make the toothpaste have a certain consistency. The paste is strip-shaped and has a good skeleton. It does not collapse or dilute when attached to the toothpaste, making the paste smooth and delicate. of.

1. Sodium carboxymethyl cellulose has good acid resistance and mildew resistance, and has good compatibility with other raw materials in toothpaste;

2. Strong water solubility and water retention, so that the paste does not separate oil and water;

3. With suitable viscosity and thixotropy, it is easy to disperse and swell in paste production, and easy to fill and produce;

4. Strong ability of protective colloid, suspension and emulsification.

Ceramic Grade Sodium Carboxymethyl Cellulose

Related Articles: Effect of Sodium Carboxymethyl Cellulose on the Properties of Ceramic Slurries

Sodium carboxymethyl cellulose can be used in ceramic body, glaze slurry and flower glaze. In the ceramic green body, sodium carboxymethyl cellulose can be used to improve the mud forming, promote the green body forming, improve the bending strength of the green body, and is a good reinforcing agent; in the glaze slurry and colored glaze, carboxymethyl cellulose Sodium can be used as a binding agent to suspend, deagglomerate and retain water.

1. Application in ceramic body

With less dosage, it can significantly improve the plasticity of the mud and the flexural strength of the raw material; it has a good loss-of-ignition property and no residue after burning; it has strong suspension and dispersibility to prevent the agglomeration of raw material particles.

2. Application in ceramic glaze slurry

The dispersion performance of the protective colloid is excellent, so that the glaze slurry is in a stable dispersed state; it can effectively increase the surface tension of the glaze, prevent moisture from diffusing into the embryo body from the glaze, and increase the smoothness of the glaze surface; in a small amount, it can effectively adjust the glaze The rheological properties of the paste are easy to polish; it can improve the bonding performance of the glaze surface, significantly increase the strength of the glaze surface, and prevent the peeling of the glaze surface; the fineness of the glaze surface is high, and the glaze slurry is stable.

3. Application in ceramic glaze

Good acid and alkali resistance, good permeability through the screen, effectively reducing the number of wipes, reducing color difference; good rheology, smooth printing, no insoluble matter.

Mining Grade Sodium Carboxymethyl Cellulose

Related Articles: Mechanism of Sodium Carboxymethyl Cellulose Inhibition of Gangue Minerals

1. In the mining industry, sodium carboxymethyl cellulose is the binder and flotation inhibitor of pellets, and is the binder raw material for forming mineral powder. Binder is an indispensable ingredient in the preparation of pellets, which can improve the performance of wet bulbs, dry bulbs and fired pellets, with good adhesion and pellet formability. The green pellets produced have good antiknock performance, high dry and wet bulb compressive strength and drop strength, and the grade of the pellets is improved at the same time.

2. Sodium carboxymethyl cellulose is also a modifier in the flotation process. It is mainly used as a silicate gangue inhibitor, used for corrosion inhibition of lead in the separation of copper and lead, and sometimes used as a dispersant for ore slime.

(1). Application in particles

Good granulation and water control; good dispersibility, high wet bulb strength; not easily deformed granules; good dry bulb strength; high blasting temperature, strong ability to control moisture release inside granules; uniform particle size distribution; smooth granule surface; and Good metallurgical properties.

(2). Application in flotation

Good water solubility and strong inhibitory ability; improve the grade of concentrate and obtain better beneficiation indicators; reduce the dosage of chemicals and the consumption of raw materials.

Paper Grade Sodium Carboxymethyl Cellulose

In the paper industry, sodium carboxymethyl cellulose is used to prepare coatings for coated paper, and can be used as wet-end additives and surface sizing agents. Our company provides different CMC products for papermaking to meet the needs of different customers.