Strength of coating from water-dispersion paint filled with carbonates and kaolins
Keywords:
water-dispersion coatings, fillers, carbonate, kaolin, chalk, tensile strengthAbstract
Background. The strength of the paint coatings is characterized by strength tensile point, percent elongation at rupture, coefficient of elasticity. They are essential for the determination of such coatings parameters, as resistance to cracking and flaking. This article continues a series of publications devoted to the development of water-dispersion paints with mineral fillers of Ukrainian origin and testing of coatings properties based on it.
The purpose of the article is estimation of strength properties of water-dispersion coatings based on Ukrainian carbonate and kaolins.
Material and methods. Object of study are the created water-dispersion paints with different fillers volume concentration (FVC) on the base of Ukrainian carbonates and kaolins. The styrene-acrylic dispersion Ucar DL 450 was used as the film-former in water-dispersion paints. The strength tests were performed on tensile-testing machine with an electronic dynamometer Mecmesin AFG 1000N by Fisher Bioblock Scientific.
Results. The strength of water-dispersion paint coatings increases according to use the carbonate fillers in such line: chemically precipitated chalk, chalk grade MMC-1, chalk grade MMC-2, carbonate filler for norplasts. Maximum tensile strength is observed when approaching the critical FVC. Filled by kaolin coatings have higher strength compared with carbonates. The maximum tensile strength of the coating from water-dispersion paints with different FVC manage to get in a mixture of carbonate fillers with the ratio of 85 wt. % chalk with bigger particle size (carbonate filler for norplasts) to 15 wt. % chalk with smaller particle size (MMC-1). Adding from 20 to 30 wt. % of kaolins grade КС-1, КНФ-86 і КВФ-90 produced by LLC "Prosco Resursy" combined with carbonates in water-dispersion paints increases the tensile strength of coatings.
Conclusion. The optimum ratio of different fractional composition of carbonate and kaolin as filler water-dispersion paints provides a coating with high tensile strength, the basic framework of it will form big particles of carbonate filler with spaces filled with smaller particles other carbonate filler and lamellar particles of kaolin.
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