Molecular design and properties of a P-N synergistic flame retardant epoxy resin curing agent

IF 3.8 4区工程技术 Q2 CHEMISTRY, APPLIED Journal of Vinyl & Additive Technology Pub Date : 2023-09-26 DOI:10.1002/vnl.22054

Hengxing Cheng, Junhong Guo, Tianjing Zhao, Yuan Ye, Baoping Yang, Jinfeng Cui, Bo Mu, Xuemei Bao, Li Tian, Xiujun Zhang, Yingping Zhou

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Abstract

The utilization of epoxy resin (EP) is widespread across various industries. Nevertheless, its combustibility restricts its broader utilization. Additive flame retardants have proven effective in enhancing EP flame retardancy in recent decades. However, poor weather and aging resistance have always been the defects of added flame retardants. A reactive flame retardant (VPD) was synthesized from 3, 5-diamino-1, 2, 4-triazole and phenylphosphonic dichloride, and was used to prepare VPD/EP flame retardant epoxy thermosets. The mechanical properties of the VPD/EP flame retardant epoxy thermosets are lower than those of pure epoxy, because the distance between molecules of VPD is increased compared with that of DDM, the cross-linking density of the polymer after curing is decreased, and the intermolecular force is reduced. The VPD/EP flame retardant epoxy thermosets have a 40% reduction in total heat release compared to pure EP, an increase in limiting oxygen index value from 24.7% (pure EP) to 29.4%, and a V-1 rating in UL-94 testing. The obtained EP has not only good flame retardancy but also better weather resistance and aging resistance than additive flame retardants.

Highlights

An intrinsic flame-retardant P and N coacting EP was designed and synthesized.
The intrinsic flame-retardant EP has excellent weather and aging resistance.
The presence of the P, the residual char generated by combustion is denser.

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P-N 协同阻燃环氧树脂固化剂的分子设计与性能

环氧树脂（EP）在各行各业都得到了广泛应用。然而，环氧树脂的可燃性限制了其更广泛的应用。近几十年来，添加型阻燃剂已被证明能有效提高 EP 的阻燃性。然而，耐候性和耐老化性差一直是添加型阻燃剂的缺陷。由 3，5-二氨基-1，2，4-三唑和苯基膦酰二氯合成了一种反应型阻燃剂（VPD），并用于制备 VPD/EP 阻燃环氧热固性塑料。VPD/EP 阻燃环氧热固性树脂的力学性能低于纯环氧树脂，这是因为 VPD 分子间的距离比 DDM 分子间的距离增大，固化后聚合物的交联密度降低，分子间作用力减小。与纯 EP 相比，VPD/EP 阻燃环氧热固性塑料的总放热量降低了 40%，极限氧指数值从 24.7%（纯 EP）提高到 29.4%，在 UL-94 测试中达到 V-1 级。与添加型阻燃剂相比，获得的 EP 不仅具有良好的阻燃性，还具有更好的耐候性和耐老化性。亮点：设计并合成了一种本征阻燃的 P 和 N 共反应 EP。本征阻燃 EP 具有优异的耐候性和耐老化性。由于 P 的存在，燃烧产生的残炭密度更高。

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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.