Carboxymethyl Cellulose Sodium for Paper Coating

Characteristics of using carboxymethyl cellulose (CMC) in paper

Increasing the water retention capacity of coating (WRA) and preventing adhesive migration

Water retention capacity is one of the important factors to improve coating efficiency and quality. The value of water retention capacity directly affects the reasonable amount of adhesive migration in the coating system. Therefore, preparing coatings with good water retention capacity is a prerequisite for ensuring the paper quality of coatings and improving the product grade. CMC is very effective in this regard. A large number of practical applications have proved that reasonable use of CMC sodium by scientifically adjusting the coating formula can not only improve the quality of coatings, but also reduce production costs.

Improving rheological properties and increasing the solids content of coatings

Coatings made with CMC have excellent rheological and leveling properties and the ability to adjust coating viscosity. The viscosity of CMC coating is much lower than that of similar and imported products. In addition, the shear thinning performance of on-machine coatings is far better than that of imported products.

Carboxymethyl cellulose (CMC) reduces the cost of use and improves economic efficiency

CMC can be used directly as a water retention agent in coatings to directly reduce the cost of use. By increasing the solids content of coatings and reducing the water content of wet coatings, CMC can reduce drying load, increase car speed, improve production efficiency, and thus reduce production costs. In coatings, CMC can also be used as a dispersant, carrier for gloss improver, and lubricant for doctor blades.

Using carboxymethyl cellulose (CMC)

The dosage of CMC additive is generally controlled between 0.5% to 1.5% (calculated based on the weight of the pigment after drying), and the specific formula can be adjusted by users according to the actual situation. Users should comprehensively adjust the dosage and formula according to factors such as the base paper, coating equipment type, paper type and grade. For example, if a coating with a higher viscosity is required and the quality of the original paper is poor, increasing the amount of CMC sodium can achieve a more obvious effect. When preparing coatings, weigh and slowly and uniformly pour CMC into the disperser in a well-dispersed pigment dispersion under high-speed mixing, then quickly stir.

Since CMC is easy to absorb moisture, it should be avoided from contact with water during storage and transportation, especially avoiding damage to packaging. Any unused fiber gum in the packaging should be sealed immediately after use.