Synthesis of a Multifunctional Phosphorus/Silicon Flame Retardant via an Industrial Feasible Technology,ACS Sustainable Chemistry & Engineering

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Synthesis of a Multifunctional Phosphorus/Silicon Flame Retardant via an Industrial Feasible Technology
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2023-07-31 , DOI: 10.1021/acssuschemeng.3c02140
Min Yu ₁ , Tongtong Zhang ₂ , Jie Li ₁ , Jihuai Tan ₁ , Xinbao Zhu _{1,

3}

Affiliation

High-performance and multifunctional epoxy resins are in increasing demand in the booming electrical and electronic fields; however, the complexity and high cost of the process pose a huge challenge for its manufacture. Herein, two multifunctional phosphorus–silicone flame retardants (DTEP and DDEDP) were synthesized by grafting rigid phosphaphenanthrene structure into a soft cyclic silicone epoxy resin, where the whole process is solvent-free, cost-effective, and a 100% atomic economy. The cured products containing 5 wt % DTEP and DDEDP (i.e., DTEP-5 and DDEDP-5) both can easily achieve a V-0 rating in the UL-94 test and their limiting oxygen index values are 28.8% and 29.1%, respectively. Compared to pure epoxy resin, the heat and smoke emissions of the optimal DTEP-5 sample were reduced by 30.8% and 31.5% during the combustion, and the toughness (impact strength) of DTEP-5 was increased by 3.3 times without sacrificing their rigidity. Additionally, due to the superior electrical insulation capabilities and low surface energy of silicone, DTEP and DDEDP impart epoxy resin with excellent dielectric and hydrophobic properties. This paper offers a facile and industrially feasible strategy for manufacturing multifunctional epoxy resin and exhibits great promise in electrical and electronic fields.

中文翻译：

通过工业可行技术合成多功能磷/硅阻燃剂

蓬勃发展的电气和电子领域对高性能和多功能环氧树脂的需求不断增加；然而，该工艺的复杂性和高成本给其制造带来了巨大的挑战。在此，通过将刚性磷杂菲结构接枝到柔软的环状有机硅环氧树脂中，合成了两种多功能磷硅阻燃剂（DTEP和DDEDP），整个过程无溶剂、成本效益高且100%原子经济。含有5wt%DTEP和DDEDP的固化物（即DTEP-5和DDEDP-5）在UL-94测试中均能轻松达到V-0级，其极限氧指数值分别为28.8%和29.1% 。与纯环氧树脂相比，最优DTEP-5样品在燃烧过程中的热量和烟雾排放量分别减少了30.8%和31.5%，在不牺牲刚性的情况下，DTEP-5的韧性（冲击强度）提高了3.3倍。此外，由于有机硅优异的电绝缘能力和低表面能，DTEP和DDEDP赋予环氧树脂优异的介电和疏水性能。本文为制造多功能环氧树脂提供了一种简便且工业上可行的策略，并在电气和电子领域展现了巨大的前景。

更新日期：2023-07-31

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