改性粉煤灰填充废胶粉复合材料研究

摘要

以废胶粉( URP)为基体相,粉煤灰(FA)为增强相,烷偶联剂为相容性制备了粉煤灰/废胶粉复合材料.研究了废胶粉和粉煤灰的最佳用量和偶联剂的用量,混合方式和最佳的硫化条件.通过扫描电镜(SEM)和红外光谱(FT- IR)分析了粉煤灰/废胶粉试样的结构和形貌.结果表明:用Si - 69对粉煤灰的改性效果好于KH - 550.废胶粉最佳用量为100份,粉煤灰40份,Si-69 1.0份.最佳的初混方式为热混,偶联剂先与粉煤灰混合,而后再与废胶粉混合.最佳硫化条件为:温度160℃,压力8MPa,时间25 min.Si - 69/FA/URP比KH - 550/FA/URP的相容性要好.硅烷偶联剂中的Si—OH和粉煤灰表面的—OH发生脱水缩合,形成了Si—O键；偶联剂的有机端和废胶粉形成了C—H键,从而改善了FA/URP复合材料相容性和力学性能.%Fly ash(FA)/used rubber powder(URP)composites were prepared,in which used rubber powder was matrix, fly ash was reinforcement,and silane coupling agent was the compatible agent. The best mass ratio of the FA/URP, coupling agent contents, blending method and curing conditions were studied. The structure and morphology of fly ash/used rubber powder samples were analyzed by scanning electron microscopy(SEM) and Fourier transform infrared spectroscopy(FTIR). The results showed that Si-69 modified fly ash is better than KH-550 modified it. The best mass ratio is rubber powder 100 phr,fly ash 40 phr, Si-69 1. 0 phr. The previous best mixed method is heat mixing, in which coupling agent is previously mixed into fly ash,and then blended with used rubber powder. The best curing conditions is at 160 ℃ for 25 min under 8 Mpa. The compatibility of Si-69/FA/URP is better than that of KH-550/FA/URP. Si-OH bonds of silane coupling agent and OH bonds on the FA surface dehydrate and condensate,and form Si-O bonds,C-H bonds are found between the organic groups of silane coupling agent and used rubber powder, thus the compatibility and mechanical properties of FA/URP composite materials are improved.