不同添加剂对防霉剂野外防霉性能的影响

为了提高户外用竹材防霉剂的抗水解、光降解和抗氧化降解能力，采用向防霉剂中添加抗氧剂、紫外线吸收剂等方法，以4年生新伐毛竹Phyllostachys edulis为试材，以防霉剂丙环唑和戊唑醇为试剂，通过24周野外防霉实验，研究抗氧剂和紫外线吸收剂的添加对防霉剂防霉性能的影响。结果表明:抗氧剂二叔丁基对甲酚（BHT）对戊唑醇的防霉效力具有较好的促进作用，以质量分数1.0%戊唑醇为例，其处理材上表面的综合防霉效力为19.14%，加入BHT后提高到34.84%，而同时加入BHT和BTA这2种添加剂可提高到42.75%；然而，BHT对丙环唑防霉效果的影响不明显。紫外线吸收剂苯骈三氮唑（BTA）对戊唑醇防霉效果有减弱作用，对丙环唑则起到明显的促进作用，以质量分数1.0%的丙环唑处理材上表面为例，纯药剂防霉效力为14.43%，加入BTA后提高到37.23%，同时添加BHT和BTA防霉效力增加到54.12%。；同时添加BHT和BTA对所选2种防霉剂均能起到明显的防霉促进作用。图4表6参17

Field tests for mold resistance with BHT and BTA added to bamboo preservatives

To improve resistance of bamboo preservatives against hydrolysis，light degradation，and oxidation degradation in outdoor applications，an antioxidant，butylated hydroxytoluene （BHT），and an ultraviolet absorber，benzotriazole （BTA），were added to the preservatives propiconazole and tebuconazole and applied to four-year-old bamboo samples. Then，the influence on mold resistance was studied through 24 weeks of field tests. Results showed that for a 1.0% concentration of tebuconazole，adding BHT alone increased resistance against mold fungi on the up-face of bamboo from 19.14% to 34.84%；however，BTA alone reduced mold resistance. Nevertheless，adding both BHT and BTA to tebuconazole increased mold resistance to 42.75%. For a 1.0% propiconazole concentration，mold resistance on the up-face of bamboo with BTA alone increased from 14.4% to 37.23%，but BHT alone had little effect；adding both BHT and BTA to propiconazole，however，increased mold resistance to 54.12%. Thus，using BHT and BTA together could enhance mold resistance of both tebuconazole and propiconazole.［Ch，4 fig. 6 tab. 17 ref.］