Special water retaining agent for paper coating

Key words:

In order to adapt to and meet the requirements of the coating process, the company's engineering and technical personnel carefully analyzed the foreign coating special CMC, and continuously improved and upgraded the product production process technology. At present, the technical indicators and application effects of the third-generation process technology products have reached the level of imported products. Among them, the shear thinning performance is obviously better than imported products. The product was identified as a "national key new product", incorporated into the national new product plan, is a key scientific and technological development project in Hubei Province, and won the "third prize for scientific and technological progress in Hubei Province" and the "first prize for scientific and technological progress in Jingzhou City".

Specializing in manure wastewater treatment and environmental protection equipment sales and installation, microbial agent cultivation and bio-organic fertilizer, formula fertilizer, water-soluble fertilizer and other production and processing and technical services enterprises

Key words:

Special water retaining agent for paper coating

Classification:

Product Description

CMC for paper coating
Sodium carboxymethyl cellulose for paper coating

In order to adapt to and meet the requirements of the coating process, the company's engineering and technical personnel carefully analyzed the foreign coating special CMC, and continuously improved and upgraded the product production process technology. At present, the technical indicators and application effects of the third-generation process technology products have reached the level of imported products. Among them, the shear thinning performance is obviously better than imported products. The product was identified as a "national key new product", incorporated into the national new product plan, is a key scientific and technological development project in Hubei Province, and won the "third prize for scientific and technological progress in Hubei Province" and the "first prize for scientific and technological progress in Jingzhou City".

The product is made of cellulose as the main raw material, after alkalization and ultra-fine treatment, and then by cross-linking, etherification and acidification and other multiple chemical reactions made of an anionic polymer with ether bond structure. The product is white or light yellow powder or granules. Non-toxic, tasteless, odorless, with good water retention, and excellent shear thinning.

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

Structural formula:

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

This product is the use of independent intellectual property rights of the process technology, the production of a high ether low viscosity characteristics, can replace imported products and fully applicable to China's coating process requirements of the coating of special water-retaining agent coating special CMC. The product has the following characteristics and functions.

  Increase the water retention value of the coating to prevent the migration of the adhesive.

The water retention of coatings 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 processed paper and improving product quality. In this respect, CMC is very effective. A large number of application practices have proved that scientifically adjusting the coating formula and correctly and reasonably using CMC can not only improve the coating quality, but also reduce the production cost.

  Improving the rheological properties of coatings and increasing the solid content of coatings

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

  Reduce the cost of use and improve efficiency

CMC is used as a water retaining agent in coatings to directly reduce the cost of use. Due to the application of CMC, the solid content of the coating can be increased, the water content of the wet coating can be reduced, the drying load can be reduced, the vehicle speed can be effectively increased, the production efficiency can be improved, and the production cost can be reduced.

  Other performance

CMC in the coating can also play the role of the coating dispersant, whitening agent carrier, scraper lubricant and so on.

  Dosage description (for reference)

The dosage of CMC is generally controlled at 0.5~1.5%(calculated by the absolute dry amount of pigment). Each user should adjust the specific formula according to the actual situation, and our company can make corresponding technical explanations or provide application technical services at the request of users.

Each user should integrate the base paper, coating equipment type, processing paper type and grade, make reasonable adjustments to the dosage and formula, and strive to form their own characteristics. If the quality of high viscosity coatings and base paper is poor, the amount of CMC can be considered to increase, and the effect is particularly obvious.

  Description of method of use

When preparing the coating, the weighed CMC is evenly and slowly sprinkled into the disperser under the condition of high-speed stirring in the dispersed pigment dispersion liquid for 15min to dissolve completely (the CMC produced by our company has good dissolution performance, and can be directly added into the white material dispersion liquid without adding water to dissolve in advance).

  Technical indicators of product quality

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)

Degree of etherification ≥

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

Water% ≤

10

10

10

10

10

The inspection method shall be carried out according to the method specified in Q/JDY 01-2009 standard document.
 
  Product packaging and storage and transportation
 

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

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