جستجوی مقالات مرتبط با کلیدواژه "heat treated wood" در نشریات گروه "صنایع چوب و کاغذ"

The aim of this Study was to investigate on the effect of using vegetable oil containing UV absorbent as coating on the weathering resistance of heat treated wood. For this purpose, 180 gr/m2 of vegetable oil (linseed or soybean) containing 0 and 0.5 wt% of UV absorbent (nano ZnO or Tinvin 326) was applied to the surface of the specimens by brush. The weathering resistance of these specimens after six months of natural weathering was examined by colorimetry, roughness, ATR-FTIR spectroscopy and stereomicroscope. The results of colorimetry indicated that in the first month of weathering, coatings containing soybean oil had less color changes than coatings containing linseed oil. But at the end of the weathering, But at the end of the weathering, specimens coated with linseed oil (pure and containing nano ZnO) and soybean oil containing nano ZnO had the least color changes compared to other treatments. The results of the roughness test revealed that the oil coatings have partially reduced surface roughness increasing due to weathering but the UV absorbents did not have a positive effect in this regard. Stereomicroscope images also indicate that coated heat treated wood specimens had less surface degradation and surface crack than uncoated specimens.

Weathering of wood plastic composite is of major concerns. Weathering due to UV light and moisture results in the degradation of wood plastic composite. In this study, effect of weathering on mechanical and physical properties of wood-polyethylene composites containing of titanium dioxide nanoparticles, photo stabilizer (tinuvin 328) and heat treated wood were investigated. The variable factors were titanium dioxide nanoparticles content (0, 1, 2 and 3%), raw material type (heat treated wood and untreated wood), tinuvin 328 (0 and 1%) and weathering time (0 and 1500h). The impact of weathering was investigated through the changes in the mechanical properties, contact angle and surface morphology of wood plastic composites. The result shows that flexural strength, tensile strength and contact angle of all samples decreased after weathering. Also, surface cracks on the weathered composites were observed with a scan electron microscope. According to the results, wood plastic composites containing titanium dioxide nanoparticles, heat treated wood and tinuvin 328 (photo stabilizer) showed less loss of mechanical properties and contact angle and fewer surface cracks after weathering compared to control sample.