【作者】 李艳涛；

【导师】 李斌；

【作者基本信息】 东北林业大学 ， 高分子化学与物理， 2008， 硕士

【摘要】 聚丙烯(PP)是一种通用型热塑性树脂,因其具有优良的综合性能而被人们广泛应用在生产生活的各个方面。但是聚丙烯属于易燃材料,这极大的限制了它的进一步应用。膨胀阻燃剂(IFR)具有低烟,无毒,无腐蚀性气体,可重复使用等优点。因此,新的膨胀阻燃体系不断被开发出来,用于聚丙烯的阻燃,成为目前聚丙烯阻燃剂研究与应用的热点。本文使用本实验室设计合成的一种三嗪系高分子成炭发泡剂(CFA),与聚磷酸铵(APP)及其他助剂复配成膨胀阻燃剂,用于聚丙烯的阻燃,研究了影响PP-IFR材料阻燃性能的各种因素:APP与CFA的比例、协效剂如分子筛、稀土氧化物等的种类与用量、抗滴落剂的用量等。发现APP/CFA在4/1时效果最佳。4A、5A和H-Beta分子筛,各种稀土氧化物,二氧化硅,二氧化钛等物质都具有较好协效能力。这些物质都能够使20%IFR添加量的阻燃聚丙烯由垂直燃烧无级别提高到V0级。氧指数提高到33～35。且最佳含量都为IFR质量的5%。抗滴落剂在0.1%添加量下就能够解决大熔流指数聚丙烯阻燃材料燃烧时的熔滴现象,使材料由较低的阻燃级别提高到垂直燃烧V0级。利用TGA、CONE、SEM等仪器对PP-IFR的热降解行为、燃烧行为、炭层形貌等进行了全面的评价和研究,结果显示对聚丙烯进行膨胀阻燃处理能够大幅度降低材料在火灾中的危险性。协效剂的加入能够进一步降低材料的热和烟的释放速率及总量,其中对烟释放速率及释放总量的降低效果更为明显。研究还发现协效剂能够催化促进体系分解,提高PP-IFR体系最终的成炭量,并有助于形成更加稳定,致密的炭阻挡层,提高炭层强度,防止炭层破裂,从而达到更高的阻燃性能。本文还将IFR用于阻燃不同型号的聚丙烯,对其性能进行了研究,发现IFR对多种型号聚丙烯都具有优异的阻燃效果,通常在20%阻燃剂添加量下就能够使1.6mm样条达到垂直燃烧UL-94 V0级,个别型号(K9020)在18%阻燃剂添加量条件下就能够通过V0级。不同PP阻燃材料的氧指数在20%阻燃剂添加量时都能够高于30%,在26%阻燃剂添加量时都能够高于35%。但是IFR的加入对聚丙烯的力学性能有一定的影响,尤其对共聚聚丙烯的冲击强度影响较大。更多还原

【Abstract】 Polypropylene（PP） is a sort of commodity thermoplastic resins, It is widely used in every respect of people’s life and production because it has fine general performance, but the further application is restricted for its flammability. The intumescent flame retardant （IFR） have some advantages, such as lower smoke, no toxic, no corrosive gases and so on. So the new IFR systems have been worked out continuously and used as the flame retardant in polypropylene. The research and application of IFR systems have been paid a great attention.In this paper, a new IFR system mainly consisted of a triazine polymer which was design and synthesis in our laboratory, named as a charing-foaming agent （CFA）, ammonium polyphosphate （APP） and other additive. Some important factors affecting the flame retardancy were studied, such as the ratio of APP to CFA, type and amount of the synergistic agents such as zeolites, rare earth oxides, the amount of anti-dripping agent and so on. The experimental results demonstrated that the flame retardancy was the best when the weight ratio of APP/CFA is 4/1, and 4A, 5A, H-Beta zeolites, the rare earth oxides, SiO₂, TiO₂ etc all have good synergistic effects, those substance all could enhance the LOI value to 33～35 and help the UL-94 rating test （1.6mm） from no rating to V0 rating at the IFR loading of 20wt%, and those substance all have a optimal content is 5% in IFR. The anti-dripping agent could resolve the flaming dripping phenomenon of the flame ratardant PP materials which have big Melt Flow Rate, and help the UL-94 rating test （1.6mm） from low rating to V0 rating.TGA, CONE and SEM were used to evaluate the thermal degradation, combustion and the morphological structures of the burnt char layer of PP-IFR materials respectively. The results show that the flame retardant PP have extraordinary lower fatalness in the fire compared with pure PP resin. The synergists could efficiently reduce the heat and smoke release rate and total amount, especially for the smoke production rate and total smoke production. The research also found that the synergists could accelerate the degradation of the systems, enhance the char formation in high temperature to form stabile, compact char layer, and prevent the char layer from cracking, thereby a better flame retardancy is obtained.In this paper, we also studied the flame retardancy and properties of different type of PP-IFR materials. It was found that the IFR are quite effective in many types of PP resins. The IFR-PP materials with 20wt% IFR could pass the UL-94 rating test （1.6mm）, some of types （K9020）could pass the test at 18wt% content of IFR in PP. The LOI value of all type of PP flame retardant PP-IFR materials could be higher than 30 at 20wt% IFR loading, and 35 at 26wt% IFR. However, there have some influence on the mechanical property of the PP-IFR materials, especially for the Izod Impact Strength of polypropylene（copolymer）.更多还原