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Introduction of CMC Coating Water Retention Agent

Jul. 11, 2019

Carboxymethylcellulose sodium CMC has a wide range of applications in many industries. The textile printing and dyeing industry often use CMC for coloring and dying. It is also used in daily necessities, coatings, etc., mainly in coatings. As an HPMC Supplier, let's take a look at it briefly.

As a water retention agent for coatings, carboxymethyl cellulose can control and adjust the rheology of coatings, improve the water retention value of coatings, and prevent the migration of water-soluble adhesives. In addition, its excellent film-forming properties make coatings particularly suitable for size presses. Membrane transfer coating and blade coating are more conducive to overcoming the scratches caused by the metering rod or scraper, making the surface of the coating appear smooth and smooth, avoiding the phenomenon of "orange peel", giving the coating good optical properties, not Transparency, sufficient surface strength and good K&N values.

CMC Powder

CMC Powder is also widely used as an auxiliary adhesive in coating operations in the paper industry. It has excellent adhesion. Each CMC can replace 3-4 parts of modified starch or soybean casein, 1.5-2.0 parts of latex, which can be reduced. The total amount of glue is conducive to improve the solid content of the coating.

Because CMC has a rigid cellulose backbone and a large hydration volume in colloidal coatings, it is, of course, considered a thickener for coatings. As a thickener, the cellulosic polymer can affect the flocculation state of the pigment particles, thereby affecting the coating structure and coating rheology. The cohesion between the pigment particles depends on the interaction behavior of various components in the coating such as pigments and adhesives, that is, the association between the particles. Most importantly, the adsorption of Carboxymethyl Cellulose in the coating greatly affects the structure of the coating and the colloidal binding of the coating.

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