Chen Wendan, Li Honghui, Li Lu, Wang Xuesong
Fujian Provincial University Engineering Research Center of Industrial Biocatalysis, College of Chemistry and Materials Science, Fujian Normal University, Fuzhou 350007, China.
ACS Omega. 2020 Oct 26;5(43):28186-28195. doi: 10.1021/acsomega.0c03916. eCollection 2020 Nov 3.
An efficient brucite@zinc borate (3ZnO·3BO·3.5HO) composite flame retardant (CFR), consisting of an incorporated nanostructure, is designed and synthesized via a simple and facile electrostatic adsorption route. It has been demonstrated that this incorporated system can enhance the interfacial interaction and improve the mechanical properties when used in ethylene-vinyl acetate (EVA) composites. Meanwhile, in the process of burning, the CFR particles can successively migrate and accumulate to the surface of the burning zone, increasing the local concentration and rapidly generating a compact barrier layer through a condensed phase reinforcement mechanism even at a lower loading value. Especially, compared with the EVA/physical mixture (PM, with the same proportion of brucite and zinc borate), the heat release rate (HRR), the peak of the heat release rate (PHRR), the total heat released (THR), the smoke production rate (SPR), and mass loss are considerably reduced. According to this study, controlling the nanostructure of flame-retardant particles, to improve the condensed phase char layer, gives a new approach for the design of green flame retardants.
通过简单便捷的静电吸附路线，设计并合成了一种高效的水镁石@硼酸锌（3ZnO·3B₂O₃·3.5H₂O）复合阻燃剂（CFR），其具有整合的纳米结构。已证明，这种整合体系在用于乙烯-醋酸乙烯酯（EVA）复合材料时，可增强界面相互作用并改善机械性能。同时，在燃烧过程中，CFR颗粒能相继迁移并积聚到燃烧区表面，提高局部浓度，甚至在较低负载值下也能通过凝聚相增强机制迅速生成致密的阻隔层。特别是，与EVA/物理混合物（PM，水镁石和硼酸锌比例相同）相比，热释放速率（HRR）、热释放速率峰值（PHRR）、总热释放量（THR）、产烟速率（SPR）和质量损失均显著降低。根据这项研究，控制阻燃颗粒的纳米结构以改善凝聚相炭层，为绿色阻燃剂的设计提供了一种新方法。
