论文部分内容阅读
采用快速成核/晶化法、油酸钠改性以及高速球磨分别得到改性前后锌镁铝类水滑石(Zn Mg Al-LDHs)、Sb2O3-Zn Mg Al-LDHs样品。通过XRD、FTIR、FESEM和TG等对所制备的LDHs、Sb2O3-LDHs进行了表征。考察了添加量为6/100(PVC为100)时,改性前后LDHs、Sb2O3-LDHs的添加对所制备的LDHs/聚氯乙烯(PVC)复合材料阻燃及力学性能的影响,结果显示:添加改性前后LDHs、Sb2O3-LDHs所制备的PVC基复合材料均达到V-0级别,极限氧指(LOI)值可达33.4%,且添加改性LDHs、Sb2O3-LDHs的复合材料力学性能均有所改善。材料燃烧后残碳及断面的FESEM显示:改性LDHs、(Sb2O3)10-LDHs的添加使PVC基复合材料燃烧后表面形成结构密实的保护性炭层,提高阻燃性能;改性LDHs在软PVC中分散均匀,相容性较好,使得改性LDHs具有更优的增强和增韧作用;而Sb2O3-LDHs在PVC基体间存在界面差异,导致材料的断裂伸长率、拉伸强度随Sb2O3质量分数的增加有所下降。
The samples of Zn Mg Al-LDHs and Sb2O3-Zn Mg Al-LDHs were obtained by means of rapid nucleation / crystallization, sodium oleate modification and high-speed ball milling respectively. The prepared LDHs and Sb2O3-LDHs were characterized by XRD, FTIR, FESEM and TG. The effects of LDHs and Sb2O3-LDHs addition on the flame retardancy and mechanical properties of LDHs / PVC composites were investigated at 6/100 loading (PVC 100). The results showed that: The PVC composites prepared by LDHs and Sb2O3-LDHs had a V-0 level and the LOI reached 33.4% before and after modification, and the mechanical properties of the composites with modified LDHs and Sb2O3-LDHs it has been improved. The FESEM of the residual carbon and the cross-section of the material after combustion shows that the modified LDHs and (Sb2O3) 10-LDHs make the surface of the PVC-based composite material form a dense protective carbon layer after combustion and improve the flame retardancy; PVC dispersed evenly, better compatibility, making the modified LDHs have better enhanced and toughening effect; and Sb2O3-LDHs in PVC matrix interface differences, leading to the material elongation at break, tensile strength with Sb2O3 The increase in the mass fraction decreased.