Novel method for the evaluation of mechanical property of pigment coating layer and its application: Influence of spreading of latex binder on final properties of coating layer

A new hydrothermal method is proposed which enables us to prepare thin hydroxyapatite (HA) ceramic coatings on Ti substrates with a curved surface at low temperatures. The method uses double layered capsules in order to produce a suitable hydrothermal condition; the inner capsule encapsulates the coating materials and a Ti substrate, and the outer capsule is subjected to isostatic pressing under the hydrothermal condition. In this study, it is demonstrated that a pure HA ceramic layer with the thickness of 50 µm could be coated to a Ti cylindrical rod at the low temperature as low as 135°C under the confining pressure of 40 MPa. Pull-out tests were conducted to obtain an estimate for the adhesion properties of the HA coating prepared by the double layered capsule method. The shear strength obtained from the pull-out tests was in the range of 4.0-5.5 MPa. It was also shown that the crack propagation occurred within the HA coating layer, not along the HA/Ti interface in the pull-out tests.

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Investigation into Coating Surface Free Energy and Microstructure of Coated Paper Related to Pigment

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.884-885.212 ◽

2014 ◽

Vol 884-885 ◽

pp. 212-215

Author(s):

Ying Li ◽

Wen Juan Gu ◽

Bang Gui He

Keyword(s):

Free Energy ◽

Calcium Carbonate ◽

Surface Free Energy ◽

Coating Layer ◽

Physical Structure ◽

Coated Paper ◽

Paper Surface ◽

Pigment Coating ◽

Printing Ink ◽

Better Than

The physical structure of coating layer have an important influence on transferring and setting of the printing ink. In this study, the effect of pigment on surface microstructure and surface free energy was investigated. The findings indicated that the pigment affected the pore size, depth and distribution of the coated paper surface. Kaolin pigment compared with calcium carbonate pigment was good to improve the paper surface smoothness. Surface free energy of kaolin pigment coating was higher than calcium carbonate pigment coating, which showed that surface wettability of coating with kaolin pigment was better than calcium carbonate pigment.

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Effect of core-shell structure latex on pigment coating properties

BioResources ◽

10.15376/biores.14.1.1241-1251 ◽

2018 ◽

Vol 14 (1) ◽

pp. 1241-1251

Author(s):

Kyudeok Oh ◽

Araz Rajabi Abhari ◽

Wanhee Im ◽

Jee-Hong Lee ◽

Zhenghui Shen ◽

...

Keyword(s):

Pore Structure ◽

Shell Structure ◽

Coating Layer ◽

Core Shell ◽

Binding Ability ◽

The Core ◽

Coated Papers ◽

Pigment Coating ◽

Hard Shell ◽

Core Shell Structure

The pore structure of the coating layer is one of the most important factors in determining the printability of coated papers. The coating pigment and binder are two principal components in paper coating, and their characteristics have a critical influence on the coating structure. The glass transition temperature (Tg) of latex binders affects the mechanical strength and pore structure of the pigment coating layer because the latex Tg influences the binding ability of latex and the shrinkage of the coating layer during the drying process. In this study, styrene-acrylate (S/A) core-shell structure latexes with different monomer compositions in the core and shell layers were designed, and their properties were compared with those of a conventional latex. These core-shell latexes were prepared using the same monomers in the same proportion and were used to investigate the effect of the core-shell structure on the structural and mechanical properties of the coating layer. The hard-shell latex with a high styrene content in the shell part yielded paper that was glossier and less rough and formed finer pores, resulting in an increased ink absorption rate into the coated paper compared to the other types of latex. The hard-shell structure showed better performance in printing uniformity and had less mottling.

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Structure characterisation of pigment coating layer on paper by scanning electron microscopy and image analysis

Nordic Pulp & Paper Research Journal ◽

10.3183/npprj-2002-17-03-p307-312 ◽

2002 ◽

Vol 17 (3) ◽

pp. 307-312 ◽

Cited By ~ 20

Author(s):

Gary Chinga ◽

Torbjørn Helle

Keyword(s):

Electron Microscopy ◽

Scanning Electron Microscopy ◽

Image Analysis ◽

Coating Layer ◽

Pigment Coating ◽

Scanning Electron

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Quantitative characterization of the spreading and adhesion of styrene-butadiene latex binder in the dried pigment coating layer

Progress in Organic Coatings ◽

10.1016/j.porgcoat.2021.106555 ◽

2022 ◽

Vol 162 ◽

pp. 106555

Author(s):

Jee-Hong Lee ◽

Sang Jin Shin ◽

Seung Uk Yeu ◽

Hak Lae Lee

Keyword(s):

Coating Layer ◽

Quantitative Characterization ◽

Pigment Coating ◽

Styrene Butadiene

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The Effect of a Polymer-Stabilized Latex Cobinder on the Optical and Strength Properties of Pigment Coating Layers

Polymers ◽

10.3390/polym13040568 ◽

2021 ◽

Vol 13 (4) ◽

pp. 568

Author(s):

Zhenghui Shen ◽

Araz Rajabi-Abhari ◽

Kyudeok Oh ◽

Sooyoung Lee ◽

Jiachuan Chen ◽

...

Keyword(s):

Optical Properties ◽

Coating Layer ◽

Strength Properties ◽

Porous Coating ◽

Coated Paper ◽

Pigment Coating ◽

Surface Optical ◽

Coating Layers ◽

Coating Color ◽

Polymer Stabilized

Coated paper with a porous coating layer may have enhanced light-scattering ability and thus favorable optical properties. However, the increased porosity of such a coating layer is likely to decrease the strength of the coated paper, thereby adversely affecting the quality of the paper in the printing and converting processes. In this research, polymer-stabilized (PS) latex was prepared and used as a cobinder for the pigment coating of the paper. The PS latex particles were colloidally stabilized by a 3:1 mixture of starch and polyvinyl alcohol. The influence of the PS latex cobinder on the viscosity, sedimentation, and consolidation of coating colors was investigated. In addition, the effect of the cobinder on the properties of coating layers, namely, their porosity and surface, optical, and tensile properties, was examined. The results revealed that the PS latex cobinder formed microstructures in the coating colors and affected their viscosity. The addition of PS latex also led to enhanced interactions between coating color components, which affected the consolidation of the coating color, resulting in the formation of dried coating layers with greater porosity and improved optical properties (i.e., higher brightness and opacity) relative to coatings without the PS latex cobinder. Furthermore, the addition of PS latex improved the tensile strength of the coating layers, which was attributable to the small size and the polymeric protective shell of the cobinder particles. Thus, these results show that this PS latex cobinder has the potential to be used for the production of high-quality coated paper products.

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Effects of the Coating Mixture on the Penetration of Liquids into Paper

Fibres and Textiles in Eastern Europe ◽

10.5604/01.3001.0013.2909 ◽

2019 ◽

Vol 27 (5(137)) ◽

pp. 160-169 ◽

Cited By ~ 1

Author(s):

Janina Leks-Stępień

Keyword(s):

Physical Properties ◽

Porous Structure ◽

Strong Influence ◽

Coating Layer ◽

Print Quality ◽

Liquid Penetration ◽

Pigment Coating ◽

Pigment Type ◽

Printing Ink ◽

Coating Mixture

The pigment coating of paper is usually performed to enhance the physical properties of paper and its printability. The coating generally makes paper whiter, brighter and more opaque. The properties of the coated paper depend, among others, on the porous structure of the coating developed, which is determined by the pigments, binders and their reactions. The influence of the type and quantity of coating components and ink absorption into the coating layer was studied in this work. Printing ink penetration was measured using a Penetration Dynamic Analyser with an HVL module (High Viscous Liquid). The evenness of liquid penetration into paper was measured using a Penetration Dynamic Analyser with a PEA module (Print Evenness Analyser). Results obtained indicate that all three variables – coating pigment type, latex dose and ink type – may have an equally strong influence on liquid and ink penetration,and thus on print quality.

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