杨木单板树脂增强重组材的制备及性能研究

Study on Preparation and Properties of Reconstituted Lumber of Resin Impregnated Poplar Veneer

采用三聚氰胺甲醛树脂辊压浸渍杨木单板,通过高频热压定型得到树脂增强重组材,探讨不同辊压压榨率和热压压力对板材物理力学性能的影响。结果表明:利用高频介质加热进行厚板坯的成型较接触式热压可行,可缩短热压时间,提高热压效率;热压压力对杨木重组材的大部分物理力学性能影响显著,辊压压榨率对材料的静曲强度、弹性模量等影响不显著;辊压压榨率20%、热压单位压力2.0 MPa时,高频热压制备的地板用杨木重组材物理力学性能指标综合较优,该制备条件下成品材料密度为0.68 g/cm3、静曲强度50.19 MPa、弹性模量4 191.61 MPa。

The effects of different compression ratios of the roller-pressing, and different pressure during high frequency hot-pressing on the physical and mechanical properties of the reconstituted poplar lumber were studied by impregnating melamine-form aldehyde resin into each individual poplar veneer through roller-pressing before lami- nation and then molding by high frequency hot-pressing. The results showed that the high frequency hot-pressing could considerably reduce the pressing time, and greatly improve the production efficiency compared to traditional hot-pressing base on the molding of thick mat. It was also found that the pressure during hot-pressing had signifi- cant effect on most physical and mechanical properties of the lumber; however, compression ratio had no significant effect on MOR and MOE of the reconstituted lumber. The performance of the flooring reconstituted lumber could meet the desirable specifications under the condition of 20% compression ratio, under 2.0 MPa pressure during hot- pressing, and the corresponding density was 0.68 g/cm3, with MOR as 50. 19 MPa, and MOE as 4 191.61 MPa.