热空气干燥法对ACQ-D在木材内固着的加速作用

为了弄清楚热空气干燥法对加速ACQ-D(胺溶季铵铜D型)在木材内固着的加速作用，该研究采用浓度为1%的ACQ-D溶液对杉木试材进行真空浸注处理，在室温下预固着48 h后，分别对试材进行了不同的后处理，其中包括气干不包膜、气干包膜、热空气干燥不包膜、热空气干燥包膜.热空气干燥的温度为50℃，处理时间分别为2、6、12和24 h；气干处理的时间分别为1、2、4和8 d.后处理结束后进行抗流失性试验，然后测定试材中残留的铜含量，在此基础上计算ACQ-D处理杉木中铜的流失率.研究结果表明:①气干处理和热空气干燥处理对ACQ-D防腐剂在木材中的固着都有一定的积极作用，而且随着处理时间的增加固着效果都有所提高；②热空气干燥处理在固着方面的作用要优于气干处理，所需时间短而且固着效果好，在本试验条件下处理6 h以上抗流失效果较好；③包膜与不包膜两种方法应用于气干处理和热空气干燥处理中的效果有所不同，气干包膜的抗流失效果比气干不包膜的要好，而热空气包膜却比热空气不包膜的要差很多，这可能是因为使用的塑料薄膜阻碍了热量传导，使木材内的温度偏低，不利于铜在木材中的固着. 

Effects of heated air drying on accelerating fixation of ACQ-D in wood.

In order to clarify the effects of heated air drying on accelerating fixation of ACQ-D (Amine Copper Quat-Type D) in wood, Chinese fir wood samples were vacuum treated with 1% ACQ D solutions, prefixed for 48 hours at room temperature, and different post treatments were undergone including unwrapped air drying, wrapped air drying, unwrapped heated air drying, and wrapped heated air drying. The temperature in heated air drying was controlled at 50℃, and the duration of the treatment was 2, 6, 12, and 24 hours, respectively; the duration for air drying was 1, 2, 4, and 8 days, respectively. After post treatment, leaching tests were carried out and the percentage of copper leached from the samples was determined based on the copper amount remained in the samples after leaching tests. The results indicate that: 1) both air drying and heated air drying can improve the fixation of ACQ-D preservative in wood. And the effects become more obvious as the treated time increasing; 2) heated air drying is proved to be a better method than air drying in accelerating copper fixation since it requires shorter time to reach an excellent effect of fixation. In this study, a good resistance to copper leaching is obtained after heated air drying for more than 6 hours; 3) wrapping has different effects on air drying and heated air drying. It appears as a positive factor for air drying but negative for heated air drying. The reason may be that the heat transmission is blocked by the plastic film used for wrapping, which results in a low inner temperature of wood and finally slows down the copper fixation process in wood.