Investigation of the synergistic effect of red phosphorus and magnesium hydroxide on the thermal degradation behavior and flame resistance of the intumescent fire-retardant polypropylene system

IF 2 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Fire and Materials Pub Date : 2023-08-30 DOI:10.1002/fam.3175

Nhung Hac Thi, Truong Cong Doanh, Doan Tien Dat, Ho Thi Oanh, Ha Tran Nguyen, Tuyen Van Nguyen, Quang Vinh Tran, Mai Ha Hoang

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引用次数: 0

Abstract

High fire-resistance polypropylene (PP) composites were prepared by using environment-friendly flame retardants including expandable graphite (EG), red phosphorus (RP), and magnesium hydroxide (MH). Synergism between EG, RP, and MH on the thermo-oxidation behavior and flame resistance of PP was found. The incorporation of MH and RP formed highly thermally stable mixtures of magnesium phosphates consisting of Mg₃(PO₄)₂, Mg(PO₃)₂, and α-Mg₂P₂O₇ at both amorphous and crystalline phases in the burning process. The mixture not only covered the surface of burning materials but also could reinforce the char structure of the PP/EG composites, thereby significantly enhancing the condensed phase flame retardant mechanism of the composites. Mass ratios of the flame retardants were also optimized to obtain the composite with the highest flame retardant efficiency. The result revealed that the combination of EG, RP, and MH in PP at MH/RP mass ratio of 3/2 with only a total additive content of 18 wt.% could make its limiting oxygen index (LOI) increase from 16.8% to 27.2% and the UL-94 rating was improved from none to V-0. In addition, the mechanical properties of the composites were improved via the surface treatment of MH and RP with calcium stearate and silicone oil, respectively.

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红磷和氢氧化镁对膨胀型阻燃聚丙烯体系热降解行为和阻燃性能的协同作用研究

采用可膨胀石墨（EG）、红磷（RP）和氢氧化镁（MH）等环保阻燃剂制备了高阻燃聚丙烯（PP）复合材料。发现EG、RP和MH对PP的热氧化行为和阻燃性具有协同作用。在燃烧过程中，MH和RP的结合形成了由Mg3（PO4）2、Mg（PO3）2和α-Mg2P2O7组成的磷酸镁的高度热稳定混合物，其处于非晶相和晶相。该混合物不仅覆盖了燃烧材料的表面，而且增强了PP/EG复合材料的炭结构，从而显著增强了复合材料的凝聚相阻燃机理。阻燃剂的质量比也进行了优化，以获得具有最高阻燃效率的复合材料。结果表明，当MH/RP质量比为3/2时，总添加剂含量仅为18 wt.%可以使其极限氧指数（LOI）从16.8%增加到27.2%，UL‐94评级从无提高到V‐0。此外，分别用硬脂酸钙和硅油对MH和RP进行表面处理，改善了复合材料的力学性能。

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来源期刊

Fire and Materials 工程技术-材料科学：综合

CiteScore

4.60

自引率

5.30%

发文量

审稿时长

3 months

期刊介绍： Fire and Materials is an international journal for scientific and technological communications directed at the fire properties of materials and the products into which they are made. This covers all aspects of the polymer field and the end uses where polymers find application; the important developments in the fields of natural products - wood and cellulosics; non-polymeric materials - metals and ceramics; as well as the chemistry and industrial applications of fire retardant chemicals. Contributions will be particularly welcomed on heat release; properties of combustion products - smoke opacity, toxicity and corrosivity; modelling and testing.