Synthesis of multi-element flame retardant hydrazides and its modification to epoxy resin

IF 3.6 4区工程技术 Q2 CHEMISTRY, APPLIED

Journal of Vinyl & Additive Technology Pub Date : 2025-01-19 DOI:10.1002/vnl.22190

Weipeng Liu, Huajun Duan, Ya Li, Yuan Chen, Ruian Li, Jiangtao Geng, Huiru Ma

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引用次数: 0

Abstract

When flame retardants are added to epoxy resins (EP) to enhance their flame retardancy, it often results in a negative impact on the mechanical properties of itself. In order to solve this problem, a new reactive flame retardant multi-element hydrazides (BSD) is synthesized by using benzenesulfonohydrazide and diphenylphosphinic chloride as raw materials, it can play a flame retardant effect through the synergistic effect of P\N\S multi-elements, and at the same time, a large number of secondary amine groups in the structure of BSD can produce strong hydrogen bonding interactions with the hydroxyl groups of the molecular chain of EP. The experimental results proved that the incorporation of only 3 wt% of BSD enabled EP to achieve a UL-94 V-0 rating. Furthermore, when the amount of BSD is increased to 5 wt%, the values for peak heat release rate (PHRR) and total heat release showed a reduction of 26% and 20.8%, ultimately maximizing the limiting oxygen index to 34.9%, showing exceptional efficiency. In the meantime, it showed a 37.3% increase in flexural strength and a 21.4% increase in tensile strength, and the transparency of the modified epoxy resin was still maintained at this time. In summary, introducing BSD into EP obtains a highly efficient reinforced flame retardant epoxy resin (FREP).

Highlights

A P/N/S-containing hydrazide to improve the flame retardant of EP.
When the P content is 0.25 wt%, the FREP reaches UL-94 V-0 grade.
Tensile and flexural strength increased by up to 21.4% and 37.3%.
With the addition of BSD, the FREP still show high transparency.

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多元素阻燃酰肼的合成及其环氧树脂改性

在环氧树脂（EP）中加入阻燃剂以增强其阻燃性时，往往会对其本身的机械性能产生负面影响。为了解决这一问题，以苯磺酰肼和二苯基膦氯为原料合成了一种新型反应性阻燃多元素肼（BSD），它可以通过P\N\S多元素的协同作用起到阻燃作用，同时BSD结构中的大量仲胺基可以与EP分子链上的羟基产生强氢键相互作用。实验结果证明，仅加入3 wt%的BSD就能使EP达到UL-94 V-0额定值。此外，当BSD添加量增加到5 wt%时，峰值放热率（PHRR）和总放热率分别降低26%和20.8%，最终极限氧指数达到34.9%，表现出优异的效率。同时，其抗折强度提高了37.3%，抗拉强度提高了21.4%，并且此时改性后的环氧树脂的透明度仍然保持不变。综上所述，在EP中引入BSD可得到一种高效的增强阻燃环氧树脂（FREP）。重点介绍了一种含P/N/ s的肼，以提高EP的阻燃性。当P含量为0.25 wt%时，FREP达到UL-94 V-0级。拉伸和弯曲强度分别提高了21.4%和37.3%。加入BSD后，FREP仍然显示出较高的透明度。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.