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基于酚醛树脂反应,以二磷杂菲丙基双酚A (DDBA)和甲醛为原料,合成了一种含磷杂菲侧基的二磷杂菲丙基双酚A甲醛树脂(PDBA)。通过傅里叶变换红外光谱仪、核磁共振氢谱仪和凝胶渗透色谱仪等证明了产物PDBA的结构。将PDBA和DDBA作为反应型阻燃剂用于环氧树脂(EP)阻燃改性,通过极限氧指数仪、垂直燃烧试验箱、锥形量热仪、热失重分析仪和差式扫描量热仪测试手段,研究了阻燃EP的阻燃性能和热性能。结果表明,与DDBA相比,磷杂菲基团聚集程度更高的PDBA可赋予EP更好的阻燃性能和热性能,在PDBA添加质量分数为3%时,EP/PDBA的极限氧指数可达32.8%,UL94垂直燃烧等级达到V–0级,并且燃烧时热释放速率峰值较纯EP降低25.2%,玻璃化转变温度仅比纯EP下降1℃。PDBA中磷杂菲基团更高程度的聚集可为阻燃EP带来了更高的阻燃效率。 相似文献
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用于环氧树脂不饱和聚酯的聚合物型磷系阻燃剂 总被引:3,自引:1,他引:3
研究了1种新型富芳香结构的含磷聚合物阻燃剂聚苯基磷酸(9,10-二氢-9-氧杂-10-膦酰杂菲)苯撑酯(PDPPP)的合成及其对环氧树脂(ER)、不饱和聚酯树脂(USPE)的阻燃性能的影响。这种阻燃剂是由2-(6-氧-6氢-膦酰杂菲)1,4-对苯二酚(ODOPB)与苯膦酰二氯通过熔融缩聚获得。将磷含量为13.8%的PDPPP添加到环氧树脂、不饱和树脂中,结果表明该聚合物对环氧树脂、不饱和树脂具有良好的阻燃性能,PDPPP含量只需达到2%即磷含量只需达到0.28%时氧指数LOI可达28,阻燃性UL-94可达到V0级。 相似文献
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将环氧树脂E44作为基体,添加9,10-二氢-9-氧杂-10-磷杂菲-10-氧化物(DOPO)、超细氢氧化铝(ATH)、三聚氰胺氰尿酸盐(MCA)3种阻燃剂,探究三者在环氧树脂中使其性能达到最优时的最佳配比。通过单因素试验,探究每种阻燃剂的最优用量,再用Design-Expert软件设计3因素3水平的响应面优化试验,将3种阻燃剂进行复配,以氧指数和拉伸强度作为响应值,得到拟合曲线后对最优值进行验证。结果表明:DOPO,ATH,MCA质量分数分别为5.73%,20.00%,8.28%(以环氧树脂计)时,复合阻燃环氧树脂材料具有最佳性能,其极限氧指数(LOI)为31.2%、拉伸强度为28.20 MPa。 相似文献
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主要介绍了无机阻燃剂、有机阻燃剂和复合型阻燃剂改性的聚氯乙烯(PVC),以及这些阻燃剂对PVC阻燃性能的影响。其中无机阻燃剂的阻燃效果最为明显,不过消烟效果较差;有机阻燃剂消烟效果较为明显,但阻燃能力不如无机阻燃剂;复合型阻燃剂兼具有机/无机阻燃剂的优点,或具有多种无机阻燃剂的优点,一般既具有较强的阻燃能力,又具有较为显著的消烟效果,是未来PVC用阻燃剂的发展方向。 相似文献
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将4,4'-二氨基二苯甲烷(DDM)分别与苯甲醛和水杨醛进行缩合反应,所得两种缩合产物分别再与9,10-二氢-9-氧杂-10-磷杂菲-10-氧化物(DOPO)进行加成反应,得到两种新型磷氮阻燃剂A和B,并通过红外吸收光谱(FTIR)、核磁共振(NMR)和质谱(MS)方法证实了产物的结构。结果表明:所得阻燃剂分子可以和DDM一起充当环氧树脂(EP)的固化剂。将阻燃剂A、B分别同DDM加入到EP中,固化后形成的环氧固化物的Tg值和热稳定性有小幅下降,而阻燃性能大幅提高:当环氧固化体系的含磷量为1.0%时,所有环氧固化物垂直燃烧等级均达到UL94 V-0级;当磷含量达到1.5%时,B的环氧固化物的极限氧指数(LOI)达到41.2%。 相似文献
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By curing the reaction mixture of diphenylphosphine oxide (DPO) and diglycidyl ether of bisphenol A with 4,4′‐diaminodiphenylsulfone, flame‐retardant epoxy resins (EP/DPO) were prepared. Flame‐retardant epoxy resins modified with 9,10‐dihydro‐9‐oxa‐10‐phosphaphenanthrene‐10‐oxide (DOPO) were similarly prepared (denoted as EP/DOPO). The limiting oxygen index value of pure epoxy resin, EP/DPO–P‐0.9 (with a phosphorus content of 0.9 wt%), and EP/DOPO–P‐0.9 are 23.0, 30.5, and 29.4%, respectively. EP/DPO–P‐0.9 reached a UL‐94 vertical burning test V‐0 rating, while EP/DOPO–P‐0.9 failed. The results of the cone calorimetry test, thermo‐oxidative degradation behavior study, and pyrolysis‐gas chromatography/mass spectrometry analysis indicated that both flame retardants mainly act through the gas‐phase activity mechanism. Together, the results of this study suggest that EP/DPO are high performance resins with good thermal stability, high glass transition temperature, and low water absorptivity for practical applications. 相似文献
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Dongyue Liu Feng Jiang Tianlong Zhang Chunxiao Yu Zhiyu Hu Lei Zhang Shuangyou Shi 《应用聚合物科学杂志》2024,141(5):e54890
DOPO based flame retardants demonstrate exceptional flame retardancy efficiency when applied to epoxy resins. However, the crosslinking degree of epoxy resin may decrease due to the addition of DOPO, leading to a deterioration in flame retardancy and mechanical properties. Herein, a reactive DOPO derivative flame retardant 6-((1H-benzo[d]imidazol-2-yl) amino) dibenzo oxaphosphinine 6-oxide (BADO) was successfully synthesized, which contains multiple reactive sites, thus ensuring a higher degree of crosslinking in the system. As a result, the modified epoxy resin exhibits excellent flame retardancy. The limiting oxygen index value of the modified epoxy resins increased from 19.8% to 29.7% by adding 7.5 wt% BADO, and its UL-94 test passed V-0. Flame retardancy mechanism analysis reveals that BADO exhibits both gas-phase and condensed-phase flame retardant effects. In particular, the formation of a porous inside-char layer is a significant factor in reducing smoke release. The 7.5% BADO/EP composite exhibited a 43.2% reduction in total smoke production and a 43.6% reduction in total smoke rate compared to neat epoxy resins (EP). Furthermore, the addition of BADO slightly deteriorates the mechanical properties of the modified epoxy resin. 相似文献
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无卤阻燃含磷环氧树脂的研究进展 总被引:1,自引:0,他引:1
叶龙健;钱立军;佟芍朋;许国志 《中国塑料》2010,24(3):11-18
无卤阻燃含磷环氧树脂中的磷成分具有气相和凝聚相的双重阻燃作用,且材料本身降解产物不产生可持续性环境污染物,因而作为环境友好型阻燃材料而被广泛研究。本文综述了近年来关于含9,10-二氢-9-氧杂-10-磷杂菲10-氧化物(DOPO)环氧树脂体系(包含DOPO环氧树脂、DOPO基固化剂和添加型DOPO改性聚合物)、磷酸酯型环氧树脂体系(包括磷酸酯环氧树脂、环状磷酸酯环氧树脂、磷酸酯型固化剂)、含磷固化剂以及磷腈环氧树脂和磷-硅环氧树脂的研究进展,介绍了每种体系的性能特点。总结了含磷环氧树脂的阻燃性能、热性能、阻燃机理,以及磷-氮协同效应、磷-硅复合二元体系的阻燃机理。 相似文献