Preparation and characterization of PVOH/kaolin and PVOH/talc coating dispersion by one-step process

IF 2.3 4区 材料科学 Q2 Chemistry
Vaishali Saroha, Hina Khan, Sharad Raghuvanshi, Dharm Dutt
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引用次数: 5

Abstract

The poor barrier of cellulosic paper against water vapor and oil limits its wide application as a packaging material. Lamination, extrusion, and dispersion coating are applied on paper surface to improve barrier properties. Dispersion coating can be applied to paper surface on line during paper preparation using rod coater. In the present study, an attempt has been made to increase the process speed of coating preparation by single-step process at varying pigment concentration. Coating dispersion was applied on kraft paper using laboratory rod coated and dried in hot air oven at 80°C for 5 min. Furthermore, thermal stability, water vapor barrier properties, and grease resistance of PVOH/kaolin and PVOH/talc-coated paper were studied. Additionally, the effect of single layer and bilayer coating on paper properties was also studied. Permeability model was used to predict the orientation of pigments to the surface of paper. Viscosity of both kaolin and talc-based dispersion increased with the increase in pigment concentration. Thermal studies showed that at 600°C residual mass (%) of PVOH film increased from 0.6 to 9.89% and 15% with the addition of 25% (by weight) kaolin and talc pigment. At high pigment concentration (40–50%, by weight), the highest reduction in WVTR was observed for both the pigments. Excellent coverage of paper surface and high grease resistance was observed for all coating formulations. Our study showed that talc provides better thermal and barrier properties to coated paper than kaolin.

Abstract Image

一步法制备PVOH/高岭土和PVOH/滑石涂层分散体及表征
纤维素纸对水蒸气和油的阻隔性差,限制了它作为包装材料的广泛应用。在纸张表面采用层压、挤压和分散涂层来提高阻隔性能。在棒状涂布机制纸过程中,可在纸表面在线涂布分散型涂布剂。在本研究中,尝试在不同的颜料浓度下,提高单步法制备涂料的工艺速度。将涂布分散体涂在牛皮纸上,在实验棒上涂布,在80℃的热风炉中干燥5 min,并对PVOH/高岭土和PVOH/滑石粉涂布纸的热稳定性、阻水性和耐润滑性进行了研究。此外,还研究了单层和双层涂层对纸张性能的影响。采用渗透性模型预测颜料在纸张表面的取向。随着颜料浓度的增加,高岭土和滑石基分散体的粘度均增加。热研究表明,在600℃时,添加25%(重量)的高岭土和滑石颜料,PVOH膜的残余质量(%)分别从0.6提高到9.89%和15%。在高色素浓度(40-50%,重量)下,两种色素的WVTR降低幅度最大。所有涂料配方均具有优异的纸张表面覆盖度和高抗润滑性。我们的研究表明,与高岭土相比,滑石对涂布纸具有更好的热学和阻隔性能。
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来源期刊
Journal of Coatings Technology and Research
Journal of Coatings Technology and Research CHEMISTRY, APPLIED-MATERIALS SCIENCE, COATINGS & FILMS
CiteScore
4.40
自引率
8.70%
发文量
0
期刊介绍: Journal of Coatings Technology and Research (JCTR) is a forum for the exchange of research, experience, knowledge and ideas among those with a professional interest in the science, technology and manufacture of functional, protective and decorative coatings including paints, inks and related coatings and their raw materials, and similar topics.
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