Key Laboratory of Pulp and Paper Science and Technology of Ministry of Education, State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, PR China.
CAS Key Laboratory of Renewable Energy, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, No. 2 Energy Road, Tianhe District, Guangzhou 510640, PR China.
Int J Biol Macromol. 2022 Aug 31;215:132-140. doi: 10.1016/j.ijbiomac.2022.06.055. Epub 2022 Jun 15.
Hydrophobic coatings are widely used in a variety of materials surfaces. However, it remains a great challenge for the non-toxic and environmentally-friendly production of hydrophobic coatings. Herein, two nano-scale spherical lignin/SiO composite particles are synthesized based on the electrostatic interaction and the steric hindrance effect inspired by the self-protection of straw. Introduction of positively charged quaternary ammonium enhances the possibility of electrostatic self-assembly between lignin and SiO for QAL/SiO, and access of super-long hydrophobic chains induces the formation of nano-sized particles for QALC/SiO. The coatings were fabricated by simply spraying on substrates and hydrophilic/hydrophobic properties were detected. The results show that the long hydrophobic chain can enhance the hydrophobic properties of lignin polymers (CA = 129°) and the spherical micro-nano structure is beneficial to improve the hydrophobic properties of the lignin/SiO composite (CA = 137°). Meanwhile, the hydrophobic coating has good self-cleaning performance. The excellent hydrophobic and self-cleaning properties are mainly benefited from the nano effect, reasonable hydrophilic/hydrophobic structure, and good dispersibility of spherical structure. This work not only provides a kind of lignin-based nano-scale waterproof coatings holding excellent properties in terms of cost, scalability, and robustness, but also has important significance for the high-value utilization of biomass resources.
疏水涂层广泛应用于各种材料表面。然而，无毒环保型疏水涂层的生产仍然是一个巨大的挑战。在此，基于稻草自我保护所启发的静电相互作用和空间位阻效应，我们合成了两种纳米级球形木质素/SiO 复合粒子。带正电荷的季铵盐增强了木质素与 SiO 之间静电自组装的可能性，对于 QAL/SiO，而超长疏水链的引入则诱导了纳米级颗粒的形成，对于 QALC/SiO。通过简单地喷涂在基底上制备了涂层，并检测了其亲水/疏水性能。结果表明，长疏水链可以增强木质素聚合物的疏水性（CA = 129°），而球形微纳结构有利于提高木质素/SiO 复合的疏水性（CA = 137°）。同时，疏水涂层具有良好的自清洁性能。优异的疏水性和自清洁性能主要受益于纳米效应、合理的亲水/疏水结构以及球形结构的良好分散性。这项工作不仅提供了一种基于木质素的纳米级防水涂层，具有成本、可扩展性和坚固性方面的优异性能，而且对生物质资源的高值利用具有重要意义。
