| With the extensive application of wood products,the timber resources in recent years have appeared the phenomenon of severe shortage.Because of its short production cycle and high yield,bamboo is considered as an ideal substitute for wood resources.Bamboo is widely used for furniture,building materials,scaffolding and handicraft.Unfortunately,when used in outdoor environments,bamboo is easily infected by mildew due to its high sugar,starch and protein contents.Bamboo mould not only affects the use value of bamboo products,but also limits the use of bamboo products.Therefore,in view of this problem,this paper takes bamboo as the research object,and synthesizes zinc oxide on the surface of bamboo by hydrothermal method,modified zinc oxide/bamboo by poly(methylhydrogen)siloxane and ionic liquid method to prepare nano-zinc oxide on bamboo surface.The effect of nano-zinc oxide morphology on bamboo surface under different conditions and its influence on mildew resistance.This paper is divided into the following three parts:(1)The nano-zinc oxide was synthesized on the surface of bamboo by hydrothermal synthesis.The number of soaking of the seed layer on the surface of the bamboo in the reaction system,the hydrothermal reaction time,the hydrothermal reaction temperature,and the surfactant sodium dodecyl sulfate(SDS)were investigated.The effect of the amount of addition on the morphology and anti-mildew effect of nano-zinc oxide on bamboo surface.The results show that with the increase of the number of seed layers on the surface of bamboo,the coverage of nano-zinc oxide on the surface of bamboo increases.With the increase of hydrothermal time,the morphology of nano-zinc oxide on the surface of bamboo is dissolved after the formation;The change showed a rose-like morphology at 95 °C,and the morphology at 135 °C was not flat.With the increase of hydrothermal reaction temperature,the morphology of nano-zinc oxide on the surface of bamboo is dissolved.With the increase of surfactant,the morphology of nano-zinc oxide is from rice to Sheet change.Theanti-mildew test showed that the comprehensive control effect was best when the number of seed layers,hydrothermal reaction time,hydrothermal reaction temperature and surfactant SDS were 5 layers,5hours,95 ° C and 0.12 M,respectively.(2)ZnO/PMHS coatings were fabricated on bamboo timber surfaces by hydrothermal synthesis method and hydrophobic modification with poly(methylhydrogen)siloxane(PMHS).The surface chemical characteristics and microstructure of the bamboo before and after modification were investigated using Fourier transform infrared spectroscopy,scanning electron microscopy,and water contact angle(WCA).The morphology results indicated that ZnO on the surface of bamboo forms flower-like aggregations.The WCA of ZnO/bamboo increased from 65° to 142° after PMHS hydrophobic modification,indicating that the hydrophobicity of bamboo was significantly improved.The original bamboo had poor anti-mildew properties when exposed to Trichoderma viride,Aspergillus niger,and Penicillium citrinum.After depositing ZnO onto the surface of the bamboo,the anti-mildew properties were significantly improved.Furthermore,it was found that after PMHS hydrophobic modification,ZnO/bamboo had excellent anti-mildew properties when exposed to the three mold hyphae,the infection value of all three molds is 0.(3)The nano-zinc oxide was loaded on the surface of bamboo by ionic liquid method,and the influence of reaction time and molar ratio of zinc chloride to urea on the anti-mildew property of bamboo surface was investigated.The results showed that in the loading of nano-zinc oxide on the surface of bamboo by ionic liquid method,with the increase of reaction time,the anti-mildew effect of bamboo increased first and then decreased,when the reaction time was 2h,the control effect on mold was the best.In the molar ratio of zinc chloride to urea,when zinc chloride and urea were added The anti-mildew effect is best when the molar ratio is 1:2. |
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