Accelerated weathering performance of Scots pine preimpregnated with copper‐based chemicals before varnish coating Part:1 coated with cellulosic and polyurethane varnishes

2019 ◽  
Vol 136 (1) ◽  
pp. 34-44
Author(s):  
Ahmet Gunduz ◽  
Ergun Baysal ◽  
Turkay Turkoglu ◽  
Caglar Altay ◽  
Mustafa Kucuktuvek ◽  
...  
Keyword(s):  
Scots Pine ◽  
Accelerated Weathering ◽  
Varnish Coating

Evolution of extractive composition in thermally modified Scots pine during artificial weathering

Holzforschung ◽  
2019 ◽  
Vol 73 (8) ◽  
pp. 747-755 ◽  
Author(s):  
Haiying Shen ◽  
Jiaqi Xu ◽  
Jinzhen Cao ◽  
Jun Jiang ◽  
Shaodi Zhang ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Fatty Acids ◽  
Scots Pine ◽  
Degradation Products ◽  
Gas Chromatography Mass Spectrometry ◽  
Accelerated Weathering ◽  
Artificial Weathering ◽  
Thermally Modified Wood ◽  
Modified Wood

AbstractIn order to clarify the evolution and role of extractives in thermally modified wood during the process of weathering, the compositions of acetone extractives from thermally modified Scots pine after exposure in an accelerated weathering tester for different durations were determined using gas chromatography-mass spectrometry (GC-MS). Fatty acids and phenolics were proved to be the main types of extractives in weathered thermally modified Scots pine, and some sugars, terpenes and alcohols were also collected. With the progress of weathering, the content of fatty acids decreases significantly while that of phenolics increases. The reduction or even elimination of the fatty acids is presumed to be a physical process, namely, a discharge from wood during exposure to radiation and elevated temperature. The increase of phenolic extractives is mainly due to the photodegradation of other wood components. Phenolic degradation products play the role as a “barrier” against further photodegradation of thermally modified wood, among which vanillin or its derivatives appeared to be the most predominant and important ones.

scholarly journals Effect of accelerated weathering test on selected properties of bamboo, Scots pine and Oriental beech wood treated with waterborne preservatives

2019 ◽  
Vol 70 (4) ◽  
pp. 391-398
Author(s):  
Elif Topaloglu
Keyword(s):  
Scots Pine ◽  
Compression Strength ◽  
Modulus Of Elasticity ◽  
Beech Wood ◽  
Mechanical Tests ◽  
Modulus Of Rupture ◽  
Accelerated Weathering ◽  
Oriental Beech ◽  
Static Modulus ◽  
The Difference

This paper investigates the changes in density, compression strength parallel to grain, static modulus of rupture and modulus of elasticity of untreated (control) and waterborne-treated bamboo (Phyllostachys bambusoides), Scots pine (Pinus sylvestris) and Oriental beech (Fagus orientalis) specimens subjected to accelerated weathering using an accelerated weathering chamber for 672 hours. Wolmanit-CB (CCB), tanalith-E (Tan-E), amine copper quat-1900 (ACQ) and boric acid-borax (BB) were used as waterborne preservatives. The retention value of bamboo specimens was lower than that of wood specimens due to the difference in anatomical structure of bamboo. The value of density, compression strength parallel to grain, static modulus of rupture and modulus of elasticity of treated bamboo and wood were generally higher than those of untreated specimens after accelerated weathering. ACQ treatment generally provided the best protection against weathering in all mechanical tests for both bamboo and wood specimens, while CCB treatment provided an effective protection against weathering in compression strength for Oriental beech. BB treatment provided the least protection against weathering for bamboo and wood specimens compared to other waterborne preservatives.

scholarly journals Optimization of the effect of accelerated weathering conditions on wood surfaces via the Taguchi method

BioResources ◽  
2021 ◽  
Vol 16 (1) ◽  
pp. 1642-1653
Author(s):  
Rifat Kurt ◽  
Ahmet Can
Keyword(s):  
Taguchi Method ◽  
Scots Pine ◽  
Color Change ◽  
Accelerated Weathering ◽  
Color Changes ◽  
Uv Irradiance ◽  
Total Color Change ◽  
Uv Lamps ◽  
Wood Surfaces ◽  
Cutting Direction

This study investigated the effect of accelerated weathering conditions on total color changes on Scots pine (Pinus sylvestris L.) and poplar (Populus x euroamericana) wood surfaces using the Taguchi method. The experiments, based on the L18 orthogonal array, were conducted separately for both tree species. The radial and tangential surfaces of wood specimens were subjected to an accelerated weathering process using 340 nm ultraviolet (UV) lamps and temperature conditions of 50 °C. The factors for the minimum color change were determined via the signal-to-noise (S/N) ratios of the four parameters thought to be effective on color change. These parameters were cutting direction (two levels), UV-irradiance, conditioning, and water (three levels each). The most important factor affecting the color change was then determined by analysis of variance (ANOVA) testing. The results showed that the maximum UV-irradiance (W/m2) had the largest effect on the total color change, while the cutting direction (radial and tangential) had the smallest effect. The factors that affected the total color change of the poplar and Scots pine wood specimens were the same. However, the analysis revealed that different application times had varying effects on the color change.

Surface properties of impregnated and varnished Scots pine wood after accelerated weathering

2013 ◽  
Vol 130 (2) ◽  
pp. 140-146 ◽  
Author(s):  
Ergun Baysal ◽  
Eylem Dizman Tomak ◽  
Musa Ozbey ◽  
Ebedin Altin
Keyword(s):  
Surface Properties ◽  
Scots Pine ◽  
Accelerated Weathering ◽  
Pine Wood
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