Studying effect of accelerated aging on adhesion resistance of half polyester and polyurethane transparent coatings applied on maple and pine species

Hasani Khorshidi, Fatemeh; Emadi, Mehdi

doi:10.22092/ijwpr.2017.109580

Document Type : Research Paper

Authors

¹ B.Sc., in Wood Engineering, Faculty of Civil Engineering, Shahid Rajaee Teacher Training University, Tehran

² M.Sc. in Wood Engineering, Faculty Natural Resources, Tarbiat Modares University

https://doi.org/10.22092/ijwpr.2017.109580

Abstract

In this study, effect of accelerated aging on adhesion strength of half-polyester and polyurethane transparent coatings were evaluated in maple and pine species. For this purpose, dried specimens with 12×110×550 millimeters were used. Sealer as substrate, and half-polyester and binary polyurethane as coatings were applied on wood. Coatings were implemented thereby film applicator and gun methods, and accelerated aging test of wood specimens was carried out according to ASTM D1037. Results indicated that maximum value of adhesion strength is belong to binary polyurethane in maple applied by film applicator and minimum for half-polyester in pine applied by gun method, in opposite. Due to thin film, velocity variations in gun method by painter person, and consequent rapid evaporation of thinner, adhesion decreased in comparison with film applicator method. Also it's found that accelerated aging diminished adhesion strength of coatings in both maple and pine species. It can be concluded during the accelerated aging test, the steam causes moisture absorption and swelling of the fibers near the surface and thus reduce the resistance of the coating adhesion.Long-term effect of humidity and aging makes Ecowool quickly lose their stickiness.And the effect of floating in the water samples, lignin degradation products in the process of steaming and freezing and heating washed by water And cause the loosening of the cellulosic fibers in the wood, resulting in wood adhesive strength is significantly reduced due to the accelerated aging test.

Keywords

Main Subjects

Biology and Wood Protection

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Iranian Journal of Wood and Paper Science Research

Studying effect of accelerated aging on adhesion resistance of half polyester and polyurethane transparent coatings applied on maple and pine species

References

References

Volume 32, Issue 2 - Serial Number 59
July 2017
Pages 205-214

Studying effect of accelerated aging on adhesion resistance of half polyester and polyurethane transparent coatings applied on maple and pine species

References

References

Volume 32, Issue 2 - Serial Number 59July 2017Pages 205-214

Volume 32, Issue 2 - Serial Number 59
July 2017
Pages 205-214