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Journal of Coating Science and Technology
Number of Followers: 0

Hybrid journal (It can contain Open Access articles)
ISSN (Online) 2369-3355
Published by Lifescience Global

[13 journals]

Carbon Nanotubes Coating for Micropunch
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  Authors: Kelvii Wei Guo
  Abstract: The multi-walled carbon nanotubes (MWCNTs) were coated on micropunch homemade equipment with the waste alcohol as a resource. The correlated characteristics were evaluated by scanning electron microscopy (SEM), transmission electron microscope (TEM), and Raman spectroscopy. Moreover, the synthesized MWCNTs were grown on some micropunches to confirm the relevant, beneficial effect on the service life of micropunches compellingly and convincingly. The results indicate that MWCNTs coated on micropunch can enhance its service life up to 35% of that without MWCNTs. Due to the lubrication of MWCNTs coating between the micropunch and the specimen, the wear of the micropunch coated with MWCNTs distinctively decreases, even in the severe wear period. As a result, the correlated wear loss is also less than that of the micropunch without MWCNTs coating, ascribed to the graphitic nature of MWCNTs. Meanwhile, because of the usage of the waste alcohol, the technique of the relevant synthesized MWCNTs is green to the environment, which is promising for practical applications.
  PubDate: Thu, 19 May 2022 00:00:00 +000
Electrostatic Interactions to Attach Latex to Pigment Surface to Reduce
Binder Migration
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  Authors: Pradnya D. Rao; Douglas W. Bousfield, Carl P. Tripp
  Abstract: For many paints, paper coatings, and other pigmented coatings, latex and soluble binders are used to impart mechanical properties. However, non-uniform latex binder distributions are often observed in the thickness direction during application and drying, leading to quality issues. While several publications have documented this issue, few solutions are offered in the literature. Here we report a simple process to use electrostatic interactions to attach latex binder to pigments. Coating suspensions are generated using cationic precipitated calcium carbonate (PCC) pigments that are mixed with anionic styrene-butadiene (SB) latex binders resulting in latex-covered pigments. The migration of latex binder in coatings generated on various substrates under various drying conditions was measured using Raman spectroscopy and compared with reference coatings. The new system shows reduced latex binder migration for most situations than those obtained with the reference coating. The coated papers were also measured for strength, opacity, gloss, water drainage rate, and porosity. Little difference is seen in the picking strength of the coating and gloss compared to coatings prepared with standard formulations. Water drainage rate, opacity, and porosity were higher for latex-covered pigment (LCP) coatings than the reference standard coating; this increased porosity is likely due to the strong electrostatic attraction that exists between the cationic pigment and anionic latex binder that reduces the densification of the coating during drying.
  PubDate: Wed, 11 May 2022 00:00:00 +000

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