The use of an all-cationic coating formulation to reduce the amount of latex in paper coatings.

Autor: Rao, Pradnya D., Bousfield, Douglas W., Tripp, Carl P.
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Zdroj: Colloid & Polymer Science; Apr2023, Vol. 301 Issue 4, p303-312, 10p
Abstrakt: The strength of pigmented coatings is crucial in applications such as paints, lithium-ion batteries, and paper coatings. An ongoing challenge that is driven by cost has been to reduce the amount of latex binders in formulations while maintaining the strength in the coatings. This paper describes the development of an all-cationic coating formulation with lower binder content that has comparable strength to coatings made with conventional anionic formulations with higher binder concentration. Adsorption of poly diallyl dimethyl ammonium chloride onto anionic precipitated calcium carbonate (PCC) and styrene-butadiene (SB) latexes produced cationic pigments and latexes. The all-cationic coating with 7 parts per hundred (pph) parts pigment latex levels demonstrated equal coating strength to anionic based coatings with 10 pph latex levels when applied as a coating on paper. The increase in coating strength is due to the impedance of migration of cationic binder at the paper-coating interface due to charge interactions between the cationic binder and the anionic paper fibers. As a result, a second strategy comprising layer-by-layer deposition of all-cationic formulations followed by their anionic equivalent resulted in coatings with lower strength because of failure at the coating layer interface due to lack of interpenetration of the coating components. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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