压缩空气微爆破预处理对橡胶木单板 染色效果的影响

为了提高木材的渗透性，改善木材染色效果，采用压缩空气微爆破进行橡胶木单板预处理，探究微爆破压力、 处理次数对单板染色效果的影响；采用电镜和压汞分析法，表征处理前后单板表面形貌及微观孔隙。结果表明，处 理压力对单板上染率和表面色深影响显著，在优化工艺条件下（压力0.4 MPa、爆破4 次），上染率和表面色深值 分别提高22.76%和19.69%；处理后木材的孔隙率和平均孔径均明显增大，比表面积略大，有利于染料的渗透。

Influence of Compressed-air Explosion Pretreatments on Dyeing Rubber Wood Veneers

Compressed-air explosion pretreatments were used to improve the permeability of rubber wood veneers. Dyeing effects of the rubber wood veneer samples before and after treatments were compared. Under different pressure and explosion times, surface characteristics and micro pore of the veneer samples were observed with electron microscopy and mercury intrusion porosimetry. The results showed that the pressure of the compressed-air explosion treatments had significant effect on dye-uptake and surface darkness of the rubber wood veneer samples. Under optimal pretreatment conditions e.g. 0.4 MPa of air pressure for 4 times, the dye-uptake and surface darkness of the samples increased by 22.76% and 19.69%, respectively. The mercury intrusion porosimetry results showed that the porosity and average pore diameter of the samples increased significantly and the specific surface area was slightly enlarged after the pretreatment, which was useful for dyes to better penetrate into wood.