硼酸锌含量对麦秸秆/PP复合材料耐霉菌腐蚀性能的影响

Effects of zinc borate contents on fungus corrosion resistance of wheat straw/PP composites

为探讨防霉剂硼酸锌对麦秸秆/聚丙烯(PP)复合材料耐霉菌腐蚀性能的影响,对添加不同含量硼酸锌的麦秸秆/PP复合材料进行了霉菌加速腐蚀实验。测试其腐蚀后的力学性能、颜色变化和吸水性,采用FTIR分析其官能团的变化,采用体视显微镜观察并分析复合材料表面霉菌生长情况及表面微观结构。结果表明:硼酸锌对麦秸秆/PP复合材料耐腐蚀性能有较好的改善作用,硼酸锌最佳添加量为2wt%,麦秸秆/PP复合材料腐蚀后表面霉菌生长较少,其弯曲强度、弯曲弹性模量、拉伸强度和冲击强度比不添加硼酸锌分别提高6.5%、50.2%、6.8%和11.1%,吸水率和色差值降低23.9%和30.7%。含量为2wt%的硼酸锌能够有效阻止霉菌菌丝腐蚀麦秸秆/PP复合材料的麦秸秆纤维素和半纤维素,而硼酸锌含量较高时会影响复合材料的界面,导致界面处麦秸秆纤维更易受霉菌腐蚀作用。

In order to investigate the influence of antimildew agent zinc borate on the fungus corrosion resistance of wheat straw/polypropylene （PP） composites, the fungus accelerating corrosion experiments of wheat straw/PP composites with different contents of zinc borate were conducted. The mechanical properties, color variation and water absorption of composites after corrosion were tested. And FTIR was used to analysis the changes o{ functional groups of composites. Also the surface mildew growth and microstructure of composites were observed by stereomicroscope. The results show that the zinc borate could improve the corrosion resistance of wheat straw/PP composites. The optimum additive amount of zinc borate is 2wt%, wheat straw/PP composites have little mildew on the surface and flexural strength, flexural elastic modulus, tensile strength and impact strength are increased by 6.5 %, 50.2 %, 6.80%and 11.1 %respectively after corrosion compared with non-adding zinc borate composites. The water absorption rate and color difference value are decreased by 23.9 % and 30.7 %. The zinc borate could effectively prevent the mildew corrosion to the cellulose and hemicellulose of wheat straw in wheat straw/PP composites when the content of zinc borate is 2wt% and interface wheat straw fiber is easily corrodible by fungus when the content of zinc borate is more than 2wt% due to its effect on interface of composites.