Study evaluates weathering effect on adhesion strength
Wednesday, 8 February 2012
The results of this study showed that the concentration chemical was a major factor affecting adhesion strength characteristics.
Treated samples were coated with polyurethane, synthetic and waterbased varnishes.
Source: Ivan Kmit - Fotolia.com
A new study evaluated the effect of weathering on adhesion strength of Scotch pine samples treated with three concentrations of "Tanalith-E”. Treated samples were coated with polyurethane, synthetic and waterbased varnishes prior to 500 h accelerated weathering test. Adhesion strength between varnishing materials and substrate samples was determined employing pull-off type equipment. Tests showed that the adhesion strength values of the samples decreased with increasing concentration of the treatment chemical. The highest average strength value was found as 3.48 MPa for untreated control samples. The lowest average value of 2.88 MPa was found for the samples having 9 % concentration and coated with waterbased varnish. Results of statistical analysis revealed that the samples coated with three different types of varnishes did not show any significant difference from each other at 95 % confidence level. It was also found that the chemical treatment of the samples adversely influenced their overall adhesion strength characteristics. Read the complete study in "Progress in Organic Coatings”, vol. 73, issue 2-3, 2012, pp. 211-214.
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