Zhang Naien, Zhang Jie, Yan Hong, Guo Xiaorong, Sun Qiang, Guo Ruijie
Key Laboratory of Interface Science and Engineering in Advanced Materials (Taiyuan University of Technology), Ministry of Education, Taiyuan 030024, PR China; College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, PR China.
Key Laboratory of Interface Science and Engineering in Advanced Materials (Taiyuan University of Technology), Ministry of Education, Taiyuan 030024, PR China; College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, PR China.
J Hazard Mater. 2019 Jul 5;373:856-865. doi: 10.1016/j.jhazmat.2019.04.016. Epub 2019 Apr 4.
To overcome the flammability and severe dripping of polypropylene (PP), a novel organic-inorganic hybrid K-HBPE@APP (microencapsulated APP by a hyperbranched polyester (HBPE) via silane coupling agent (KH-550)) was obtained and used as a high-efficient flame retardant and smoke suppressant. Herein, HBPE acted as the charring agent for APP. 20 wt% of K-HBPE@APP imparted PP excellent flame retardancy, V-0 rating (UL-94 test) and 82.6% decrease in the peak of heat release rate (PHRR). However, PP with 25 wt% of mechanically mixed APP and HBPE achieved V-1 rating (UL-94 test) and 77.3% decrease in PHRR. That is because the direct contact and sufficient interaction between APP and HBPE gives full play to their synergy. Besides, K-HBPE@APP accelerated the formation of cross-linked POC/SiOSi/SiOC/SiOP/POΦ structures, leading to a strong and compact char layer with a result of dramatic reduction in heat release rate and smoke production. Furthermore, K-HBPE@APP was highly water-resistant and has good compatibility with PP matrix. In particular, the flame-retarded PP had similar tensile strength to pure PP and enhanced impact strength.
为克服聚丙烯（PP）的易燃性和严重的滴落问题，制备了一种新型有机-无机杂化材料K-HBPE@APP（通过硅烷偶联剂（KH-550）用超支化聚酯（HBPE）微胶囊化APP），并将其用作高效阻燃剂和抑烟剂。在此，HBPE作为APP的成炭剂。20 wt%的K-HBPE@APP赋予PP优异的阻燃性能，达到V-0等级（UL-94测试），热释放速率峰值（PHRR）降低82.6%。然而，含有25 wt%机械混合APP和HBPE的PP达到V-1等级（UL-94测试），PHRR降低77.3%。这是因为APP和HBPE之间的直接接触和充分相互作用充分发挥了它们的协同作用。此外，K-HBPE@APP加速了交联POC/SiOSi/SiOC/SiOP/POΦ结构的形成，导致形成坚固致密的炭层，从而显著降低热释放速率和烟雾产生。此外，K-HBPE@APP具有高度的耐水性，与PP基体具有良好的相容性。特别是，阻燃PP具有与纯PP相似的拉伸强度和增强的冲击强度。
