The importance of waterborne coatings has been increased because they are more environmental friendly, have less toxicity and improved flame retardant properties. Beside these advantages it was faced with some disadvantages as decreased mechanical properties, poor water resistance etc., due to the usage of emulsifiers. Consequently, waterbased polymer nanocomposites have been increased its importance and have started to be studied by various research groups [1-3] to overcome some of these problems and to improve desired properties. Some recent studies on clay/polymer nanocomposite emulsion coatings have been mostly focused on thermoset or hard thermoplastic polymers in order to obtain better mechanical properties especially for coating of though surfaces. But there are limited works focused on the improvement of the coatings properties for soft surfaces such as textile and leather. The aim of this work is synthesis of the nanocomposites based on montmorillonite and acrylic comonomers e.g. butyl acrylate, methyl methacrylate. Batch emulsion polymerization method was applied. The obtained emulsions and their films were characterized by means of FTIR, XRD, DSC and also mechanical tests were performed.
The DMA analysis of the nanocomposites showed that some mechanical properties are improved significantly especially at the temperatures above Tg. The ultrasonication process was found to be useful to increase the homogeneity of the emulsions containing montmorillonite and to achieve the intercalation. The obtained nanocomposite emulsions were considered to be suitable to apply on garment leathers in finishing formulations as base-coat binders due to their good film forming ability and elasticity.

1. Zheng J. P., Wang J. X., Gao S., Yao K. D., J.Mater. Sci. Letters, 2005, 4687; 2.Tong X., Zhao H., Tang T., Feng Z., Huang B., , J.Polym. Sci: Part A: Polym Chemi, 40, 2002, 1706; 3. Jeong H. M. and Lee S. H., , J. Macromol Sci. B42, 6, 2003, 1153.

1. FULLTEXT: Nanocomposites based on montmorillonite/acrylic copolymers for aqueous coating of soft surfaces, Microsoft Office Document, 1.6MB

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