State Key Laboratory of Inorganic Synthesis & Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, PR China.
Jilin Province Product Quality Supervision Test Institute, Changchun 130103, PR China.
Waste Manag. 2021 Nov;135:381-388. doi: 10.1016/j.wasman.2021.09.025. Epub 2021 Oct 1.
Due to the complex network of aromatic units, lignin is difficult to achieve high-value applications in the industrial field, becoming the largest "natural waste". In this paper, dual-phase fillers with excellent rubber reinforcement were prepared from lignin and sodium silicate through the method of controllable two-step acid precipitation without any complicated modification. During the formation of hybrid nanoparticles, silica nanoparticles were formed as templates in the first step, and then lignin was used as coating agent to bind with silica. The size and morphology of products could be easily adjusted by changing acid precipitation conditions. The LS hybrid nanoparticles with the best reinforcement performance showed the ability to replace carbon black (CB) in a high proportion. In addition, LS-S hybrid nanoparticles made from rice husk black liquor had similar physical and chemical properties and excellent reinforcement properties to LS. Even if the ratio of each component of the raw material was different, the product could be flexibly controlled by the two-step acid precipitation to obtain the expected properties. The wide applicability of this method in many extraction processes based on alkaline procedures was proved, and it provided a basis for the process design of comprehensive utilization of biomass. This work will promote the application of lignin in high-value fields, and the sustainable development of the rubber industry by utilizing agricultural waste was achieved.
由于芳族单元的复杂网络，木质素在工业领域难以实现高价值应用，成为最大的“天然废物”。本文通过可控两步酸沉淀法，无需任何复杂的改性，从木质素和硅酸钠制备出具有优异橡胶增强性能的双相填料。在杂化纳米颗粒的形成过程中，硅纳米颗粒首先作为模板形成，然后木质素作为包覆剂与硅结合。通过改变酸沉淀条件，很容易调节产物的尺寸和形态。具有最佳增强性能的 LS 杂化纳米颗粒表现出能够以高比例替代炭黑（CB）的能力。此外，由稻壳黑液制备的 LS-S 杂化纳米颗粒具有与 LS 相似的物理化学性质和优异的增强性能。即使原料的各组分比例不同，也可以通过两步酸沉淀灵活控制产物，获得预期的性能。该方法在许多基于碱性工艺的提取过程中的广泛适用性得到了证明，为生物质综合利用的工艺设计提供了依据。这项工作将促进木质素在高价值领域的应用，并通过利用农业废弃物实现橡胶工业的可持续发展。
