Improvement of adhesion strength of polyurethane and alkyd coatings by nano-silane using sol-gel method

Gholamian, Hadi; Tarmian, Asghar; Abdulkhani, Ali

doi:10.22092/ijwpr.2017.108093.1367

Document Type : Research Paper

Authors

¹ Assistant Professor, Department of Wood and Paper Science & Technology, Faculty of Natural Resources, University of Tehran, Karaj, Iran

² Associate Professor, Department of Wood and Paper Science & Technology, Faculty of Natural Resources, University of Tehran, Karaj, Iran,

³ Associate Professor, Department of Wood and Paper Science & Technology, Faculty of Natural Resources, University of Tehran, Karaj, Iran

https://doi.org/10.22092/ijwpr.2017.108093.1367

Abstract

In present study, the adhesion strength of polyurethane and alkyd coatings on the poplar wood (Populus nigra) was improved by nano-silane coating using sol-gel method for outdoor application. For this purpose, the boards with dimensions of 15 × 10 × 2 mm were prepared according to EN 927-5. The surfaces of wood specimens were modified with Tetraethoxy‌silane (T) sol-gel material and then, solvent-borne alkyd (AS) and solvent-borne polyurethane (PS) coatings were applied. The coated samples were placed outdoor on a platform with a slope close to Karaj latitude (36̊) for 8 months according to ISO 877 standard. In order to characterize the quality of the coatings, colorimetric, tensile adhesion (Pull off), scratch adhesion (Cross cut) and ATR-FTIR tests were performed before and after weathering. The ATR-FTIR analysis demonstrated that the wood surface was covered with silicon oxides (SiO2) attached to hydrocarbon chains. As a result of surface wood modification by sol-gel, the color and adhesion strength of polyurethane and alkyd coatings were less affected by weathering. The highest tensile and scratch adhesions were found for the combined sol-gel and polyurethane coatings.

Keywords

Main Subjects

Biology and Wood Protection

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Improvement of adhesion strength of polyurethane and alkyd coatings by nano-silane using sol-gel method

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Volume 32, Issue 3 - Serial Number 60September 2017Pages 322-333

Volume 32, Issue 3 - Serial Number 60
September 2017
Pages 322-333