【摘要】 采用改性剂Si-69对矿渣(SP)进行表面处理得到改性矿渣(MSP)，以聚丙烯(PP)为基体、MSP代替传统无机填料通过熔融共混的方式制备PP/MSP复合材料，分析改性矿渣对PP/MSP复合材料力学性能的影响，探讨改性矿渣在PP基体中的分布状况及其与PP结合的紧密程度。结果表明：MSP质量分数在0～40%范围内，随MSP含量的增加，PP/MSP复合材料的拉伸强度呈先升后降的变化趋势、但均高于PP纯样，弹性模量呈上升趋势，冲击强度呈先升后降的变化趋势；MSP质量分数为20%时，PP/MSP复合材料的综合力学性能最好，弹性模量达508.9 MPa，相比于PP纯样提升了39.6%，冲击强度也由1.83 kJ/m~2提高至1.96 kJ/m~2；改性剂Si-69一侧为长链烷基、另一侧为水解产生的Si—OH,Si—OH与SP表面的—OH结合，长链烷基与PP基体亲和性较强，致使MSP与PP基体结合紧密，极大减少MSP在PP基体中的团聚，大幅提升PP/MSP复合材料的力学性能。更多还原

【Abstract】 The modified slag powder(MSP) was obtained by surface treatment of the slag powder(SP) with the modifier Si-69, PP/MSP composites were prepared by melt blending using polypropylene(PP) as the matrix and MSP instead of traditional inorganic filler. The influence of MSP on the mechanical properties of PP/MSP composites was analyzed, and the distribution of MSP in PP matrix and the close binding degree of MSP to PP were discussed. The results show that with the increase of MSP content in the range of 0-40%, the tensile strength of PP/MSP composites increases first and then decreases but is higher than that of pure PP samples, the elastic modulus increases, and the impact strength increases first and then decreases. When the mass fraction of MSP is 20%, the comprehensive mechanical properties of PP/MSP composites are the best, the elastic modulus is 508.9 MPa, which is39.6% higher than that of pure PP sample, and the impact strength is also increased from 1.83 kJ/m~2 to1.96 kJ/m~2.One side of modifier Si-69 is long chain alkyl and the other side is hydrolysis generated Si—OH,Si—OH is bound to SP surface —OH. The affinity between long chain alkyl and PP matrix is strong, which makes MSP closely bound to PP matrix, greatly reduces the agglomeration of MSP in PP matrix, and greatly improves the mechanical properties of PP/MSP composites.更多还原