铜纤维与木单板的复合

Composition of copper fiber and wood veneer

为了赋予木基复合材料电磁屏蔽功能,在脲醛树脂胶中加入黄铜纤维导电单元,制备三层结构的落叶松复合胶合板,研完不同施加量和不同长度的导电单元以及涂胶量对木基复合材料电磁屏蔽性能(SE)和胶合强度(ST)的影响。结果表明,胶合强度均达到或超过国家标准。涂胶量增大对电磁屏蔽效能有不利影响。在黄铜纤维长度相同(6～7 mm)的条件下,电磁屏蔽效能为6.34～28.76 dB,电磁屏蔽和胶合强度模型均不显著;在黄铜纤维施加量相同(120g/m^2)的条件下,电磁屏蔽效能为15.61～35.01dB,电磁屏蔽模型均显著,胶合强度模型不显著。黄铜纤维的加入一方面有利于导电网链的形成,但另一方面对胶合强度有不利影响,进而不利于胶合板的导电性,因此电磁屏蔽性能是这两个方面综合作用的结果。黄铜纤维长度的增加可以使胶层中黄铜纤维的搭接率增加,有利于电磁屏蔽效能的增加。

Copper fiber（CF） is：added to urea-formaldehyde（UF） resin to make 3-layers Larix composite plywood with electromagnetic shielding effectiveness （SE）.The influence of different spreading and length of CF on electromagneticshield effectiveness and shear strength （ST）of Larix composite plywood was researched. The results show that all the ST can meet or exceed the nation standard. The increasing UF spreading has the adverse influence on SE. At the same length（6-7 mm） of CF, the SE is 6.34-28.76 dB; the model of SE and ST is insignificant. At the same spreading （ 120 g/m^2） of CF, the SE is 15.61 -35.01 dB, the model of SE is significant, and the model of ST is insignificant. Spreading of CF can increase the electro-conductive network, on the other side, it has the adverse influence on ST, then on electroconductivity of plywood. SE is the compositive effect of the two sides. The increasing length of CF can increase the joint rate of CF in the adhesive layer and has the advantageous influence on SE.