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Gaikwad and Ko, J Material Sci Eng 2015, 4:1 ƗƢƜ 10.4172/2169-0022.1000151
Journal of Material Sciences & Engineering
ISSN: 2169-0022
Research Article Review Article
Open Access Open Access
Overview on in Polymer-Nano Clay Composite Paper Coating for Packaging Application Gaikwad KK* and Seonghyuk Ko Department of Packaging, Yonsei University, Wonju, 220-710, South Korea Abstract This is a review of the existing studies on the Polymer/ clay nano composite used for improving water and moisture barrier in coating. Clays have been and continue to be one of the more important industrial minerals. Research and development activities by clay scientists in academia, government, and industry are continually resulting in new and innovative clay products many of these new applications are the result of improved processing which provides clays RIKLJKHUSXULW\PRUHSUHFLVHSDUWLFOHVL]HDQGGLVWULEXWLRQZKLWHUDQGEULJKWHUFRORUPRGL¿HGVXUIDFHFKHPLVWU\DQG RWKHU SK\VLFDO DQG FKHPLFDO PRGL¿FDWLRQV 6RPH QHZ DQG LPSURYHG FOD\ SURGXFWV LQFOXGH WDLORUHG RU HQJLQHHUHG paper coating kaolins, nanocomposites for plastics etc. The use of mineral pigments in coating to provide improved barrier properties has recently gaining increased attention. I described the use of Polymer nano clay for improving the barrier properties of the coated paper studied by several researchers.
Keywords: Paper coating; Polymer/clay nanocomposite; Moisture barriers Introduction The paper packaging industry is one of the growing industries due to an increasing demand for packaging products in the market. In addition, market competition often forces companies, especially in market of consumer products, to enhance the packaging in order to improve the image of their products and by this attract more consumers to buy them. Paper coating, which is one way to enhance the packaging, is a process where a coating film is applied onto paper to impart certain qualities to the paper, including weight, surface gloss, smoothness and protection. The coating materials widely used are thin laminated-plastic films or liquid polymeric coat. Without coatings, paper does not have the strength, gloss, printability or resistance to grease and moisture that is required in most of these growth areas [1]. The term “clay” refers to a naturally occurring material composed primarily of fine-grained minerals, which is generally appropriate water contents and will harden with dried or fired. Although clay usually contains phyllosilicates, it may contain other materials that impart plasticity and harden when dried or fired [2]. Associated phases in clay may include materials that do not impart plasticity and organic matter. Clays have been and continue to be one of the more important industrial minerals. Clays and clay minerals are widely utilized in many facets of our society. They are important in geology, agriculture, construction, engineering, process industries, and environmental applications. Traditional applications are many. Some of the more important include ceramics, paper, paint, plastics, drilling fluids, foundry bondants, chemical carriers, liquid barriers, decolorization, and catalysis Kaolin is one of the most widely used pigments in paper industry and exploited in a large range of coating applications [3]. Fine secondary kaolin’s are used for good gloss because of their smaller particle size. In general, platy kaolin particles carry out good coating opacity and printability [4,5] Kaolin has a layered structure, which is composed so that (0 0 1) crystal plane is parallel to the surface of kaolin particle (Table 1). Nanocomposite Properties Polymer composites are mixtures of polymers with inorganic or organic additives having certain geometries (fibers, flakes, spheres,
particulates). The use of nanoscale fillers is leading to the development of polymer nanocomposites and represents a radical alternative to these conventional polymer composites [6-8]. This new generation of composites exhibits significant improvements in modulus, dimensional stability and solvent or gas resistance with respect to the pristine polymer. Nanocomposites also offer extra benefits like low density, good flow, better surface properties and recyclability. It is worth recalling that all these improvements are obtained at very low filler contents (generally lower than 5%) [6] . The enhancement of many properties resides in the fundamental length scales dominating the morphology and properties of these
Kaolin l:llayer
Smectite
Palygorskite
2:llayer
2:1 layer invetted Light tan or gray
White or near white
Tan, olive green, gray. or white Octahedral and tetrahedral substitutions
Little substitution
Octahedral substitution
Minimal layer charge Low base exchange capacity
High layer charge
Moderate layer charge
High base exchange capacity
Moderate base exchange capacity
Elongate
3VHXGRKH[DJRQDOÀDNHV 7KLQÀDNHVDQGODWKV
Low surface area Vety low absorption capacity
Vety high smface area High surface area High absotption capacity High absotptiou capacity
Low viscosity High viscosity Table 1: Some important properties of clay minerals that relate to their applications. Vety high viscosity
*Corresponding author: Gaikwad KK, Department of Packaging, Yonsei University, Wonju, 220-710, South Korea, Tel: 82 1599-1885; E-mail: gaikwadk@yonsei.ac.kr Received November 25, 2014; Accepted January 23, 2015; Published January 31, 2015 Citation: Gaikwad KK, Ko S (2015) Overview on in Polymer-Nano Clay Composite Paper Coating for Packaging Application. J Material Sci Eng 4: 151. doi:10.4172/2169-0022.1000151 Copyright: © 2015 Gaikwad KK, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
J Material Sci Eng ISSN: 2169-0022 JME, an open access journal
Volume 4 • Issue 1 • 1000151
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