酚醛胶胶合板老化性质的研究

<正>本文报道了加速老化试验对酚醛胶胶合板物理力学性能的影响。经加速老化试验APA D-1和D-5,V_(100),ASTM D1037-78后,酚醛胶胶合板的各项强度指标均明显降低,吸水率和吸水厚度膨胀率增大;性能降低的幅度随循环次数的增加逐渐减小,加速老化试验对九层胶合板静曲弹性模量的影响比静曲强度的影响大。加速老化试验D-5、ASTM、V(100)三个方法的条件剧烈程度相当。我国胶合板标准规定的工类胶合板试件处理条件的剧烈程度大致与ASTM 6循环加速老化相同。

A STUDY ON ACCELERATED-AGING TESTS OF PHENOLIC-BONDED PLYWOOD

This paper purposely studies effects of accelerated-aging test on propel ties of phenolic-bonded plywood 9 layers (18mm) and 3 layers of plywood were used in experiments. As a result of accelerated-aging tests, various proper-ties of phenolic-bonded plywood decreased obviously, While the water-absorb-ing ratio and percent thickness swelling of plywood increased. The effect of accelerated-aging tests on MOE of 9-layer phywood is larger than that on MOR. The D-5, ASTM and V100 of accelerated-aging test have same severe exposure condition, Violent degree of sample treatment of I-degree plywood shown in the China plywood standard is similar to the six-cycle accelerated-aging test of ASTM.