Effect of different IFS (MWCNTs, BN, and ZnO) on flame retardant, thermal and mechanical properties of PA6/aluminum diisobutyl phosphinate composites

IF 3.8 4区工程技术 Q2 CHEMISTRY, APPLIED Journal of Vinyl & Additive Technology Pub Date : 2024-08-27 DOI:10.1002/vnl.22141

Songjiang Xu, Yushu Xiang, Xuanying Huan, Qiu Xu, Shikai Ma, Dongmei Bao, Shuhao Qin, Daohai Zhang, Haijun Du

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Abstract

In this paper, the effects of the synergistic flame retardation of aluminum diisobutyl phosphinate acid (APBA) with three inorganic fillers of different dimensions (multi-walled carbon nanotubes [MWCNTs] [1-dimensional], hexagonal boron nitride [BN] [2-dimensional], and zinc oxide [ZnO] [3-dimensional]), respectively, on the properties of nylon 6 (polyamide 6 [PA6]) materials were investigated. It was shown that under the same additive amount, with the increase of spatial dimension of inorganic fillers, the thermal stability and residual carbon capacity were improved. Which would catalyze the formation of more and denser carbon layers in the matrix material, effectively blocked the transfer of oxygen and heat, enhanced the cohesive-phase flame retardancy of synergistic flame-retardant PA6 composites, and exerted a better synergistic flame-retardant effect with APBA. So that the flame-retardant properties of PA6 composites were gradually improved, and the mechanical properties were also gradually increased. The comprehensive performance of three types of inorganic fillers gradually improves in the order of MWCNTs < BN < ZnO. When the addition amount of ZnO was 2 wt%, the vertical combustion grade (UL-94) of PA6 composite was V-0, and the limiting oxygen index (LOI) was as high as 36.5%. The tensile strain increased by 19.11% and impact strength increased by 20.26% compared with PA6, and PA6/APBA-Zn can be used as a flame retardant PA6 composite material with balanced overall performance.

Highlights

Diisobutylaluminium hypophosphite and inorganic fillers have efficient synergistic flame retardant effects in PA6.
With the increase of spatial dimension of inorganic fillers, the better the synergistic flame retardant effect in PA6.
The flame retardant can degrade to release the phosphorous free radicals.
Inorganic fillers can cross-link with the PA6 substrate and promote the charring.

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不同 IFS（MWCNTs、BN 和 ZnO）对 PA6/二异丁基膦酸铝复合材料阻燃性能、热性能和机械性能的影响

本文分别研究了膦酸二异丁酯铝（APBA）与三种不同维度的无机填料（多壁碳纳米管[MWCNTs][1维]、六方氮化硼[BN][2维]和氧化锌[ZnO][3维]）协同阻燃对尼龙6（聚酰胺6[PA6]）材料性能的影响。结果表明，在添加量相同的情况下，随着无机填料空间尺寸的增加，尼龙 6 的热稳定性和残炭容量都有所提高。结果表明，在相同添加量下，随着无机填料空间尺寸的增加，热稳定性和残炭容量得到提高，从而催化基体材料中形成更多、更致密的碳层，有效阻隔氧气和热量的传递，增强了协同阻燃 PA6 复合材料的内聚相阻燃性，并与 APBA 发挥了更好的协同阻燃效果。因此，PA6 复合材料的阻燃性能逐渐得到改善，力学性能也逐渐提高。三种无机填料的综合性能按照 MWCNTs < BN < ZnO 的顺序逐渐提高。当 ZnO 的添加量为 2 wt% 时，PA6 复合材料的垂直燃烧等级（UL-94）为 V-0，极限氧指数（LOI）高达 36.5%。与 PA6 相比，拉伸应变提高了 19.11%，冲击强度提高了 20.26%，PA6/APBA-Zn 可用作综合性能均衡的阻燃 PA6 复合材料。随着无机填料空间尺寸的增加，PA6 的协同阻燃效果越好。阻燃剂可以降解释放磷自由基。无机填料可与 PA6 基材交联，促进炭化。

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来源期刊

Journal of Vinyl & Additive Technology 工程技术-材料科学：纺织

CiteScore

5.40

自引率

14.80%

发文量

审稿时长

>12 weeks

期刊介绍： Journal of Vinyl and Additive Technology is a peer-reviewed technical publication for new work in the fields of polymer modifiers and additives, vinyl polymers and selected review papers. Over half of all papers in JVAT are based on technology of additives and modifiers for all classes of polymers: thermoset polymers and both condensation and addition thermoplastics. Papers on vinyl technology include PVC additives.