Preparation and characterization of nanocomposite uralkyd varnishes for a wood substrate

被引:5
作者
Kowalczyk, Krzysztof [1 ]
机构
[1] West Pomeranian Univ Technol Szczecin, Inst Polymer, PL-70322 Szczecin, Poland
关键词
EIS; Montmorillonite; Nanocomposite; Uralkyd; Wood varnish; MODIFIED MONTMORILLONITES; COATINGS; CONCRETE;
D O I
10.1007/s11998-013-9558-3
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
Three types of commercially modified montmorillonites (mMMT) have been tested as nanofillers in solventborne uralkyd coating compositions. The mMMT was introduced in the amount of 0.5 wt part into a coating system based on a soya oil fatty acid and isophorone diisocyanate (100 wt parts), applied onto a wood substrate, and oxidatively cured at room temperature for 14 days. An incorporation of organophilized montmorillonite into a coating composition significantly affects its viscosity (mMMT with a higher gallery space value increases that parameter) and slightly reduces the hardness of a dry coat. Moreover, a clay nanofiller increases glass transition temperature, abrasion resistance, elasticity, and impact resistance as well as barrier properties (measured using a conventional gravimetric method and an electrochemical impedance spectroscopic test) of a cured varnish. In the case of chemical resistance to acetone, lower blistering of modified coats was found.
引用
收藏
页码:421 / 430
页数:10
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