Fabrication of transparent and durable superhydrophobic polysiloxane/SiO2 coating on the wood surface
Fabrication of transparent and durable superhydrophobic polysiloxane/SiO2 coating on the wood surface
复制标题
DOI：
10.1007/s10570-021-03758-1
复制
发表时间：
2021-02-17
期刊：
影响因子：
5.7
通讯作者：
Zhang, Xinxiang
中科院分区：
文献类型：
--
作者：
Yue, Decai;Lin, Shumin;Zhang, Xinxiang
仿生超疏水表面在木材保护领域有着广泛的应用。在这项工作中，一种新型的室温硫化硅橡胶（RTVSR）超疏水涂层的木材表面的辅助下，二氧化硅纳米粒子的制备。RTVSR/SiO2超疏水涂层由聚甲基氢硅氧烷（PMHS）、乙烯基封端的聚二甲基硅氧烷（Vi-PDMS）和SiO2纳米粒子组成，其中PMHS和Vi-PDMS相互反应形成连续相，SiO2纳米粒子增加了涂层在木材表面的粗糙度。PMHS在粗糙表面的组装和稳定超疏水表面的制备中起着关键作用。详细讨论了RTVSR/SiO2超疏水涂层的形成机理。结果，改性木材具有164.4度的水接触角（WCA）和5度的滑动角（SA）。此外，木材表面的超疏水涂层具有优异的耐高低温、耐紫外线辐射、耐水冲击和自清洁性能。在木材表面涂覆RTVSR/SiO_2超疏水涂层后，木材的吸水率从45.9%明显降低到28.1%。RTVSR/SiO2超疏水涂层在户外环境中对含羟基基材，特别是木材的保护方面有着广阔的应用前景。
The bionic-superhydrophobic surface is widely used in the field of wood protection. In this work, a novel room temperature vulcanized silicone rubber (RTVSR) superhydrophobic coating was fabricated onto the wood surface with the aid of SiO2 nanoparticles. The RTVSR/SiO2 superhydrophobic coating was composed of poly(methylhydrogens)siloxane (PMHS), vinyl-terminated polydimethylsiloxane (Vi-PDMS) and SiO2 nanoparticles, in which PMHS and Vi-PDMS reacted with each other to form a continuous phase and SiO2 nanoparticles increased the roughness of the coatings on wood surface. PMHS played the key role in assembly of rough surface and hence the fabrication of stable superhydrophobic surface. The formation mechanism of RTVSR/SiO2 superhydrophobic coating was discussed in detail. As a result, the modified wood had a water contact angle (WCA) of 164.4 degrees and a sliding angle (SA) of 5 degrees. Moreover, the super-hydrophobic coating on the surface of wood has excellent resistance to both high and low temperature, UV radiation, water impact and possesses self-cleaning property. The water absorption rate decreased obviously from 45.9 to 28.1% after depositing RTVSR/SiO2 superhydrophobic coating on wood. RTVSR/SiO2 superhydrophobic coating will find a great application in protection of hydroxyl-containing substrates, especially wood, in outdoor environment.