Evaluation of the Dimensional Stability and Leaching Performance of ACQ/Wax Treated Southern Pine

• Main Authors: Lili Yu, Zhenzhong Tang, Danwei Wei, Lizhi Zhu, Junyan Zhu, Xiaojun Ma
• Format: Article
• Language: English
• Published: North Carolina State University 2016-10-01
• Series: BioResources
• Subjects: Wax; Amine copper quaternary (ACQ); Dimensional stability; Copper leaching
• Online Access: http://ojs.cnr.ncsu.edu/index.php/BioRes/article/view/BioRes_11_4_10201_Yu_Evaluation_Dimensional_Stability_Leaching_Pine
• ISSN: 1930-2126; 1930-2126

Southern pine (Pinus sp.) wood cubes were treated with ACQ solutions with wax modification and post-treated at 70 °C for 10 h with hot air circulation. The effects of wax concentrations in ACQ-treated southern pine on its dimensional stability and copper leaching performance were investigated. The ACQ/wax-treated wood exhibited improved water resistance during the water soak process. The testing of swelling and shrinkage performance of the treated wood showed that samples with a higher percentage of wax had higher resistance to water swelling and shrinkage. The samples with a lower percentage of wax addition had only a slight effect on the moisture swelling and shrinkage resistance. As a result, copper leaching from ACQ/wax-treated wood with a 2% wax concentration was reduced to a lower level compared to ACQ-treated wood. When the proportion of wax in ACQ preservative was less than 1%, a higher percentage of copper was leached from treated wood.