石蜡防水剂与CA复配处理材的力学松弛

摘要

Objective] An approach of stress relaxation was proposed in present work to investigate the interactions among the waterproof agent, preservative and wood. [Method] Paraffin emulsion waterproof using natural surfactants was prepared at dif-ferent concentrations of 0.5% and 2.0%, which were added into two concentrations (0.3%, 0.5%) of copper azole (CA) to obtain compound systems, and one-time ful-cel process was applied to treat the sapwood of Pinus spp. with a size of 10 mm (L) ×10 mm (R) ×10 mm (T). [Result] Compressive stress relaxation behaviors at two moisture levels and room temperature were measured and the results were as fol-lows: 1) compared with control group, the stress relaxation of compound system treated groups reduced, whether at oven-dried state or air-dried state. 2) Under oven-dried condition, CA could weaken the relaxation of treated samples and this effect became greater with increasing concentration of preservative, but an increase in the concentration of paraffin emulsion would slightly promote the relaxation of compound system treated samples. While under air-dried condition, both CA and paraffin wax emulsion lowered the relaxation which was inversely related to the concentrations of both agents. [Conclusion] The results were expected to shed new light on the various macroscopic properties of the compound system treated wood at a microscopic level, and to provide favorable scientific evidences and theoretical supports for the manufacture of waterproofing preservative-treated wood.%[目的]利用应力松弛的方法考察复配处理材中防水剂、防腐剂与木材的相互作用情况[方法]采用0.3%和0.5%两种浓度的CA以及0.5%、2.0%两种浓度的石蜡乳液制备复配体系，利用满细胞法一次性浸注处理10 mm(L)×10 mm (R)×10 mm (T)的南方松(Pinus spp.)试材，在常温条件下，对其进行不同含水率状态下的压缩应力松弛实验。[结果]无论在气干还是绝干状态下，CA和石蜡乳液复配处理材较未处理材的应力松弛均得以明显改善。在绝干状态下，CA防腐剂可以明显减缓试材的应力松弛，且随着CA浓度的增加，减缓效果越明显；但石蜡防水剂浓度的增加会轻微加剧复配处理材的应力松弛。在气干状态下， CA和石蜡乳液均能减缓处理材的应力松弛，且随着两者的浓度增加，处理材的应力松弛会进一步缓解。[结论]该研究结果将为工业生产防水防腐木材提供科学依据和理论支持。