Wen Qilin, Chen Yinghong, Wang Xin, Pei Haoran
State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu 610065, China.
Polymers (Basel). 2023 Jan 10;15(2):374. doi: 10.3390/polym15020374.
In this study, a ternary hydrogen (H)-bonded complex intumescent flame retardant (TH-IFR) of melamine (ME) · phosphoric acid (PA)…pentaerythritol (PER) was synthesized through hydrothermal reaction. The combination of the synthesized TH-IFR with 4A molecular sieve as the synergist was used for the first time to improve the flame retardancy of polypropylene (PP). The involved structure, morphology, flame retardancy, flame-retarding mechanism and mechanical properties of the prepared PP composites were systematically investigated. The results show that incorporation of 1 wt% synergist 4A shows the optimum synergistic effect, and the flame retardancy and mechanical properties of the flame-retarded (FR) PP composites are significantly improved. Incorporation of 4A could change the pyrolysis process of the entire system and promote the char-forming chemical interaction, thereby further enhancing the flame retardancy of FR PP composite. The synergistically flame-retarding mechanism of 4A is explained by the significantly improved quality and quantity of the solid-phase char layer, which is formed through generation of SiO and AlO substances, and also participation of PP macromolecular chains in the final char layer formation during burning. Furthermore, the improved dispersion and compatibility of TH-IFR in the composite is largely beneficial to the improvement of flame retardancy and mechanical properties.
在本研究中，通过水热反应合成了三聚氰胺（ME）·磷酸（PA）…季戊四醇（PER）的三元氢键复合膨胀型阻燃剂（TH-IFR）。首次将合成的TH-IFR与作为协同剂的4A分子筛结合使用，以提高聚丙烯（PP）的阻燃性。系统研究了制备的PP复合材料的相关结构、形态、阻燃性、阻燃机理和力学性能。结果表明，加入1 wt%的协同剂4A显示出最佳协同效果，阻燃PP复合材料的阻燃性和力学性能得到显著提高。加入4A可改变整个体系的热解过程，促进成炭化学相互作用，从而进一步提高阻燃PP复合材料的阻燃性。4A的协同阻燃机理可通过固相炭层质量和数量的显著提高来解释，这是通过生成SiO和AlO物质以及PP大分子链在燃烧过程中参与最终炭层形成而实现的。此外，TH-IFR在复合材料中分散性和相容性的改善在很大程度上有利于阻燃性和力学性能的提高。
