апрель 2019

Application of carbonate filler in styrene-acrylic compositions

S. R. Fedorovych , V. Ya. Kruhlytska , V. M. Pakhomova
Химия и современные технологии
Abstract / Full Text

The well-known world trend in the development of paint and varnish materials (PVM) is the transition from organo-soluble to environmentally safe water systems. However, along with certain advantages, water-dispersed compositions inherent some disadvantages.

Now, for the creation of various coatings are used acrylic and copolymer acrylic water dispersions, including styrene-acrylic. Styratolacrylic dispersions have a significant hardening rate. They form a decorative film that has high elasticity, water resistance, vapor permeability, excellent adhesion to many materials and is practically nontoxic [1].

In this research, we studied the properties of systems based on styrene-acrylic dispersions with carbonate fillers. For PVM application, CaCO3 must have strictly defined physical and chemical properties, requirements for which are very high. Therefore, natural calcium carbonate is replaced by a synthetic product obtained from the deposition reaction. Chemically deposited calcium carbonate differs from the natural filler by the degree of dispersion, more developed surface properties, high content of the main substance, high degree of purity and lingerie. It is thanks to these properties that chalk chemically deposited (CCD) has been widely used in the production of all types of paint and varnish materials, polymers and plastics, etc. [2].

It has been determined that the maximum content of CCD in the dispersion is 60% by weight. With a further increase in its content, the viscosity of the dispersion increases significantly and the composition becomes unsuitable for application to the surface of the material. The viscosity control of styrene-acrylic dispersion is achieved by adjusting the filler content. For the dispersions considered, the limiting dynamic tensile shear is 42.9 Pa.

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