三聚氰胺改性脲醛对马尾松速生材性质影响

通过对马尾松速生材汽蒸、热压和三聚氰胺改性脲醛树脂(MUF)表面强化处理，改善其尺寸稳定性和物理力学强度，以实现速生材的高效利用。结果表明：表面强化处理材的抗弯弹性模量、抗弯强度、横纹抗压强度（全部）分别为11 294、831、43 MPa，均较气干材的大，增幅分别达到75 %、105 %、303 %；硬度为2 479 N，较处理前气干材有所提高，增幅为90 %；但耐磨性要比气干材的差。表层的密度达0445 g/cm3，较内层增大16492 %。抗胀(缩)率(ASE)、阻湿率(MEE)和抗吸水率(RWA)分别为8623 %、5118 %和3151 %，尺寸稳定性优于气干材。因此，表面强化改性处理，有利于人工林速生材的材质改善。

Effects of the MUF on the properties of fast-growing Pinus massoniana lumber

In order to improve the dimension stability and main physical mechanical properties of Pinus massoniana and make good use of it,P.massoniana lumber treated with steam,press dried and surface strengthened with modified melamine-urea formaldehyde resin(MUF) was investigated.The results showed that the MOE,MOR,and compressive strength perpendicular to grain and hardness of the surface strengthened timber were 11 294,83.1,4.3 MPa and 2 479 N respectively,compared with the air-dried timber,and the increasing percentage were 7.5 %,10.5 %,30.3 % and 9.0 % respectively.But the abrasive wearability of the surface strengthened timber was worse than the air-dried timber.The surface density was 0.445 g/cm3 and it was 16.492 % bigger than that of internal.The ASE,MEE and RWA of the surface strengthened timber were 8.623 %,5.118 % and 3.151 %,respectively and its dimension stability was better than that of the air-dried timber.So,the surface strengthening did a lot of good to the fast-growing plantation lumber.