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

Abstract

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.

Rheological Behavior of Spectrally Selective Coatings for Polymeric Solar Absorbers

“…Among the many processing conditions, the rheological behavior of liquid paint is the most important characteristic governing the behavior of the coating during application. The importance of the rheological properties of liquid paints for the optical and functional properties of dry coating has already been confirmed [5,[10][11][12][13][14]. It has been shown that although two liquid solar paints exhibited similar shear thinning flow behavior with the same value of apparent shear viscosity at a specific shear rate, the homogeneity and optical properties of the dry coatings were tremendously diverse [11,12].…”

“…The importance of the rheological properties of liquid paints for the optical and functional properties of dry coating has already been confirmed [5,[10][11][12][13][14]. It has been shown that although two liquid solar paints exhibited similar shear thinning flow behavior with the same value of apparent shear viscosity at a specific shear rate, the homogeneity and optical properties of the dry coatings were tremendously diverse [11,12]. The results showed that rather than flow characteristics with a certain viscosity value, the whole rheological characterization, i.e., the viscoelastic properties, are of great importance [11].…”

“…It has already been reported in the literature that the rheological properties strongly influence the microstructure of the coating formed after the application. Shen et al [12] showed that rheological characterization confirmed that the addition of co-binder increases the interactions between coating components, leading to better optical performance of the applied coatings.…”

Biocidal Coatings from Complexes of Carboxylated Latex Particles and a Linear Cationic Polymer

“…These techniques find use in the paint/textile/paper industries, the production of food packaging, construction and road works, etc. [ 4 , 5 , 6 , 7 , 8 ]. Among others, butadiene/styrene binary latex (BSL) stands out with a 40% share of the world’s synthetic elastomer production [ 9 ].…”

Experimental Parameters Affecting Cross-Linking Density and Free-Thaw Stability of Cross-Linked Porous Starch

“…[1,2] The micro-pores of porous starch extend from the surface of starch granules to the center, rendering it an ideal carrier to encapsulate functional materials, such as medicament, perfumes, pigment, health care substance. [3,4] Besides, the porous starch shows good adsorption performance for metal ions, vegetable oils, etc., due to its high surface area and porous structure. [5] Therefore, porous starch has been explored as micro-capsules or adsorbents for versatile applications, e.g.…”