A highly efficient gas-dominated and water-resistant flame retardant for non-charring polypropylene
A highly efficient gas-dominated and water-resistant flame retardant for non-charring polypropylene
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用于不炭化聚丙烯的高效气体主导防水阻燃剂
DOI：
10.1039/c7ra09868e
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发表时间：
2017-01-01
期刊：
影响因子：
3.9
通讯作者：
Jian, Rong-Kun
中科院分区：
文献类型：
--
作者：
Shao, Zhu-Bao;Zhang, Ming-Xin;Jian, Rong-Kun
传统的聚丙烯（PP）磷-氮（P-N）阻燃体系通常是通过气相和凝聚相的共同作用来发挥阻燃作用的，其热稳定性和耐水性下降。本文以二苯氧膦和哌嗪为原料，通过酰胺化反应合成了一种新型的单组分气控阻燃剂DPPIP，并将其用于聚丙烯的阻燃。实验结果表明，PP/DPPIP复合材料的热稳定性和耐水性均得到了提高。PP/25重量% DPPIP在5重量%重量损失下的初始热分解温度在空气气氛下为287.5 ℃，其高于纯PP的初始热分解温度（266.1 ℃）。此外，耐水性测试证实PP/25重量% DPPIP具有仅约0.52重量%的重量损失。更重要的是，PP/25wt%DPPIP的阻燃能力得到了极大的提高，通过了V-0级（UL-94）。此外，在耐水性试验后，PP/25重量% DPPIP的LOI值几乎没有差异，仍然通过UL-94 V-0等级。锥形量热仪（CC）的结果表明，DPPIP在抑制PP在燃烧过程中的放热有积极的效果。所有这些燃烧试验表明，没有留下焦炭。采用py-GC/MS、TG-FTIR等方法研究了DPPIP的阻燃机理。结果表明，PP/DPPIP体系的自熄行为主要是由DPPIP热分解产生的气相产物引起的，该气相产物中含有大量的哌嗪及其衍生物等可燃气体产物和含磷结构。
Traditional phosphorus-nitrogen (P-N) flame-retardant systems for polypropylene (PP) always act through joint action of the gaseous phase and condensed phase, and are accompanied with a decrease of the thermal stability and water resistance. In this work, a novel mono-component and gas-dominated flame retardant, named DPPIP, was prepared through an amidation reaction of diphenylphosphinyl chloride and piperazine, and used to flame retard PP. Experimental results confirmed that both the thermal stability and water resistance of PP/DPPIP were improved. The initial thermal decomposition temperature of PP/25 wt% DPPIP at 5 wt% weight loss was 287.5 degrees C under air atmosphere, which is higher than that of neat PP (266.1 degrees C). Besides, a water-resistance test verified that PP/25 wt% DPPIP had a weight loss of only about 0.52 wt%. More importantly, the flame retardant ability of PP/25 wt% DPPIP had been greatly improved, passing the V-0 rating (UL-94). Furthermore, after the water-resistance test, the LOI value of PP/25 wt% DPPIP exhibited nearly no difference and still passed the UL-94 V-0 rating. A cone calorimeter (CC) result indicated that DPPIP had a positive effect on inhibiting heat release of PP during combustion. All of these combustion tests displayed that there was no char left. The flame retardant mechanism of DPPIP was investigated with py-GC/MS and TG-FTIR. The results illustrated that the gaseous phase resulting from the thermal decomposition of DPPIP played the leading role in the self-extinguishing behavior of PP/DPPIP, which consisted of a large amount of inflammable gaseous products such as piperazine and its derivatives, and phosphorus-containing structures.