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Sodium carboxymethyl cellulose for paper coating

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Sodium carboxymethyl cellulose for paper coating

In order to adapt to and meet the requirements of the coating process, the company’s engineers and technicians have carefully analyzed the CMC for foreign coatings, and have continuously improved and upgraded the production process technology. At present, the technical indicators of the third-generation process technology products The application effects have reached the level of imported products. Among them, the shear thinning performance is significantly better than imported products. The product was recognized as a "national key new product", included in the national new product plan, and a key scientific and technological development project of Hubei Province, and won the "Hubei Provincial Science and Technology Progress Third Prize" and "Jingzhou City Science and Technology Progress First Prize".

The product is an anionic polymer with ether bond structure made from cellulose as the main raw material, after alkalization and ultra-fine treatment, and then crosslinking, etherification and acidification. The finished product is white or light yellow powder or granular. Non-toxic, tasteless, odorless, with good water retention and excellent shear thinning.

Product chemical name: Sodium carboxymethyl cellulose, special name: CMC for coating. Unit molecular formula: C6H9O4CH2COONa

Structural formula:

Physical and chemical properties: This product is very soluble in water, absorbing moisture, insoluble in organic solvents, and has good chemical stability.

This product is a special CMC for coating water-retaining agent coating that has the characteristics of high ether and low viscosity, can replace imported products, and is fully suitable for the coating process requirements of our country by using process technology with independent intellectual property rights. The product has the following characteristics and functions.

Improve the water retention value of the coating and prevent the migration of the adhesive

The water retention of paint is one of the important factors to improve coating efficiency and coating quality. The water retention value of the coating directly affects the reasonable degree of adhesive migration in the coating system. Therefore, the preparation of better water-retaining coatings is a prerequisite for ensuring the quality of coated paper and improving product quality. In this regard, CMC is very effective. A large number of application practices have proved that scientifically adjusting the coating formula and using CMC correctly and reasonably can not only improve the coating quality, but also reduce the production cost.

Improve the rheological properties of the coating and increase the solid content of the coating

　　The paint prepared by this product has good rheology, leveling and the ability to adjust the viscosity of the paint. Compared with similar foreign products, the viscosity of the formulated coatings is significantly lower than that of similar domestic products and imported products, and the shear thinning performance of the coatings is also significantly better than that of imported products and domestic similar products. Use this coating effect.

Reduce the use cost and improve the efficiency

CMC is used as a water-retaining agent in coatings to directly reduce the cost of use. Because the application of CMC can increase the solid content of the coating, reduce the moisture content of the wet coating, reduce the drying load, effectively increase the vehicle speed, increase the production efficiency, and reduce the production cost.

Other properties

CMC can also act as a dispersant, a carrier of brighteners, and a blade lubricant in coatings.

Dosage instructions (for reference)

The amount of CMC is generally controlled at 0.5 to 1.5% (calculated based on the absolute dry weight of the pigment). Each user of the specific formula should be adjusted according to the actual situation, and our company can provide corresponding technical explanations or provide application technical services at user requirements.

Each user should integrate the base paper, coating equipment type, processed paper type and grade, make reasonable adjustments to the dosage and formula, and strive to form their own characteristics. When it is necessary to prepare high-viscosity coatings and poor quality base paper, the amount of CMC can be increased appropriately, and the effect is particularly obvious.

Instructions for use

When preparing the paint, in the dispersed pigment dispersion under high-speed stirring, evenly and slowly sprinkle the weighed CMC into the disperser and disperse at high speed for 15 minutes to dissolve all (the CMC produced by our company has good solubility , No need to add water to dissolve in advance, just add it directly to the white material dispersion).

Product quality technical indicators

Indicator name	Index value
Viscosity (2% aqueous solution) mpa．S	≤10 (NDJ-79)	20～80 (NDJ-79)	80～180 (NDJ-79)	≤20(BF)	(4％) 100-300(BF)
Etherification degre≥	0.75	0.75	0.75	0.75	0.75
PH value (1% aqueous solution)	6.5～10.5	6.5～10.5	6.5～9.5	6.5～9.5	6.5～9.5
Moisture％≤	10	10	10	10	10

Please check the method specified in Q/JDY 01-2009 standard document.

Product packaging, storage and transportation

This product is packed in kraft paper bag lined with polypropylene plastic bag, 25 kg per bag. Since CMC is easy to absorb water and moisture, it should avoid contact with water during storage and transportation, especially to avoid package damage. After use, the remaining CMC in the package should be sealed up in time.