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Density, hardness and strength properties of densified fir and aspen woods pretreated with water repellents
Holzforschung ( IF 2.4 ) Pub Date : 2021-04-01 , DOI: 10.1515/hf-2020-0075
Hüseyin Pelit 1 , Fatih Emiroglu 2
Affiliation  

In this study, the effect of thermo-mechanical densification on the density, hardness, compression strength, bending strength (MOR), and modulus of elasticity (MOE) of fir and aspen wood pretreated with water repellents was analyzed. Wood specimens were impregnated with paraffin, linseed oil and styrene after pre-vacuum treatment. Then, the impregnated wood specimens were densified with compression ratios of 20 and 40%, and at 120, 150 and 180 °C. The results indicated that the density, hardness and strength properties of the all densified specimens (untreated and impregnated) increased depending on the compression ratio and temperature. For all tested properties, higher increases were obtained in the paraffin and styrene pretreated specimens compared to untreated samples. However, the increase rates in linseed oil pretreated specimens were generally lower than untreated specimens. Regarding water repellents the most successful results in all tested properties were determined in styrene pretreated specimens. The density, hardness and strength properties of all specimens increased with the increase in compression ratio. On the other hand, the increase in the compression temperature negatively affects the properties of untreated and linseed oil pretreated specimens, while having a generally positive effect on the properties of paraffin pretreated specimens. However, all tested properties of styrene pretreated specimens have increased significantly due to the increase in compression temperature. The increasing strength properties of wood as a result of densification have increased much more with paraffin and especially styrene pretreatment. These combinations can be considered as an important potential for applications that require more hardness and strength.

中文翻译:

憎水剂预处理的致密杉木和白杨木材的密度,硬度和强度特性

在这项研究中,分析了热机械致密化对经过疏水处理的杉木和白杨木材的密度,硬度,抗压强度,弯曲强度(MOR)和弹性模量(MOE)的影响。预真空处理后,将木材标本浸入石蜡,亚麻子油和苯乙烯。然后,在120、150和180°C下以20%和40%的压缩比对浸渍的木材样品进行致密化处理。结果表明,所有压缩样品(未经处理和浸渍)的密度,硬度和强度性能均随压缩比和温度的升高而增加。对于所有测试的性能,与未经处理的样品相比,在石蜡和苯乙烯预处理的样品中获得了更高的增加。然而,亚麻籽油预处理样品的增加率通常低于未处理样品。关于拒水剂,在苯乙烯预处理的样品中确定了所有测试性能中最成功的结果。所有样品的密度,硬度和强度特性均随压缩比的增加而增加。另一方面,压缩温度的升高对未处理的和亚麻籽油预处理的样品的性能产生负面影响,而对石蜡预处理的样品的性能通常具有正面影响。但是,由于压缩温度的升高,苯乙烯预处理样品的所有测试性能均得到了显着提高。由于致密化,木材的强度特性不断提高,使用石蜡尤其是苯乙烯进行了预处理。这些组合可以被认为是需要更高硬度和强度的应用的重要潜力。
更新日期:2021-04-02
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