Fabrication of a hybrid from metal organic framework and sepiolite (ZIF-8@SEP) for reducing the fire hazards in thermoplastic polyurethane
writer：Hefu Li, Dan Meng, Peng Qi, Jun Sun, Hongfei Li, Xiaoyu Gu, Sheng Zhang
keywords：制備一種新型的雜化粒子(ZIF-8@SEP)降低熱塑性聚氨酯的火災(zāi)危險(xiǎn)性
source：期刊
specific source：Applied Clay Science
Issue time：2022年
Aluminum hypophosphite (AHP) is an effective flame retardant to thermoplastic polyurethane (TPU), but it also results in increase on smoke release caused by the presence of phosphorus groups. In this work, a novel synergistic flame retardant was fabricated from metal organic framework (ZIF-8) and sepiolite (SEP). For the compsosite of TPU/8.0AHP/1.0ZIF-8@SEP, limiting oxygen index (LOI) reached 27.5% and it satisfied the UL-94 V-0 grade. The heat release rate and the total heat release decreased by 78.9% and 39.1% compared with the control TPU respectively. The increased smoke production caused by AHP was partly adsorbed by ZIF-8@SEP, therefore, the sample of TPU/8.0AHP/1.0ZIF-8@SEP showed the lowest smoke release in cone calorimeter test. Unsimilar as other flame retardant, the using of 8.0AHP/1.0 ZIF-8@SEP just brought less than 2.0% loss on tensile strength and 7.8% drop on the elongation at break of TPU. Consequently, the ZIF-8@SEP was documented as excellent synergistic flame retardant for TPU and it brought limited damage on mechanical performance.
次磷酸鋁(AHP) 是熱塑性聚氨酯 (TPU)的有效阻燃劑，但由于磷基團(tuán)的存在，它也會(huì)導(dǎo)致煙霧釋放量增加。在這項(xiàng)工作中，一種新型協(xié)同阻燃劑由金屬有機(jī)骨架(ZIF-8) 和海泡石(SEP)制成。對(duì)于TPU/8.0AHP/1.0ZIF-8@SEP復(fù)合材料，極限氧指數(shù)（LOI）達(dá)到27.5%，滿足UL-94 V-0級(jí)要求。與對(duì)照TPU相比，放熱率和總放熱分別下降了78.9%和39.1%。由 AHP 引起的煙霧增加部分被 ZIF-8@SEP 吸附，因此，TPU/8.0AHP/1.0ZIF-8@SEP 樣品在錐形量熱儀中的煙霧釋放量最低測(cè)試。與其他阻燃劑不同的是，使用 8.0AHP/1.0 ZIF-8@SEP 僅使TPU 的拉伸強(qiáng)度損失不到 2.0% ，斷裂伸長(zhǎng)率下降 7.8%。因此，ZIF-8@SEP 被證明是 TPU 的優(yōu)異協(xié)同阻燃劑，它對(duì)機(jī)械性能的損害有限。