Preparation of urea formaldehyde microsphere and its effect on flame retardant ethylene vinyl acetate composites

Preparation of urea formaldehyde microsphere and its effect on flame retardant ethylene vinyl acetate composites
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脲醛微球的制备及其对乙烯-醋酸乙烯酯复合材料阻燃效果的影响

DOI:
10.1002/pat.4287
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发表时间:
2018-06
影响因子:
3.4
通讯作者:
Li Juan
Li Juan
中科院分区:
工程技术4区
文献类型:
--
作者:
Yu Guoxing;Liu Yinfeng;Li Juan

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制备了脲醛树脂微球(UFM),并将其与有机蒙脱土(OMMT)复合,对乙烯-醋酸乙烯共聚物(伊娃)/膨胀型阻燃剂(IFR)复合材料进行阻燃改性。结果表明,单一的IFR可以改善伊娃的阻燃性能,但效果不够理想。含有21重量% IFR的伊娃复合材料刚好被分类为UL_94 V2并且具有24.7体积%的极限氧指数(LOI)。UFM与IFR并用不能提高伊娃/IFR复合材料的阻燃性能,OMMT与IFR共混仅能提高其氧指数。在伊娃中添加2wt%的UFM、2wt%的OMMT和17wt%的IFR,获得了无熔滴的UL_94 V0和29.0vol%的氧指数。同时,峰值放热率和总放热量也有较大幅度的下降。IFR、UFM、OMMT三者之间的协同作用改善了伊娃复合材料的残炭量,改变了残炭的微观形貌,对基体树脂起到了较好的保护作用。
Urea formaldehyde microsphere (UFM) was prepared and used with organic montmorillonite (OMMT) to modify the flame retardant efficiency of ethylene vinyl acetate copolymer (EVA)/intumescent flame retardant (IFR) composites. The results show that single IFR may modify the flame retardancy of EVA, but its efficiency is not good enough. The EVA composite containing 21 wt% IFR is just classified the UL_94 V2 and has a limiting oxygen index (LOI) 24.7 vol%. Combining UFM with IFR does not improve the flame retardancy of EVA/IFR composites, and blending OMMT with IFR only improves its LOI. Adding 2 wt% UFM, 2 wt% OMMT, and 17 wt% IFR into EVA, it obtains the UL_94 V0 without melt dripping and a LOI 29.0 vol%. Also, the peak heat release rate and total heat release decrease a lot. Good synergistic effects among IFR, UFM, and OMMT improve the char residues and modify the char micromorphology of EVA composites, which provide better protect for the underlying resin.
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