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以二苯甲酮(BP)为光敏剂,采用固相紫外光接枝法在废胶粉表面接枝马来酸酐(MAH)。通过正交试验及单因素试验深入地研究了马来酸酐固相接枝废胶粉反应的规律,研究了单体浓度、光敏剂浓度、光照时间等因素对接枝率的影响。研究结果表明:接枝MAH时,当单体浓度为8%,光敏剂浓度为9%,光照时间4min,胶粉粒径为100目时,接枝率最高为5.45%。通过扫描电镜测试,废胶粉接枝上了马来酸酐。将改性后的废胶粉与天然橡胶共混,制备复合材料。研究结果表明:当改性废胶粉的添加量为10%时,复合材料的力学性能最优,拉伸强度为24.67MPa,绍尔A硬度为69。
Using benzophenone (BP) as photosensitizer, maleic anhydride (MAH) was grafted onto the scrap rubber powder by solid-phase UV grafting. The effects of monomer concentration, photosensitizer concentration, illumination time and other factors on the grafting rate were studied in detail by orthogonal test and single factor test. The results showed that when the MAH was grafted, the highest graft ratio was 5.45% when the monomer concentration was 8%, the photosensitizer concentration was 9%, the light time was 4 min, and the particle size was 100 mesh. Scrap rubber grafted with maleic anhydride by scanning electron microscopy. The modified waste rubber powder is blended with natural rubber to prepare a composite material. The results show that when the content of modified crumb rubber is 10%, the mechanical properties of the composite are the best, the tensile strength is 24.67MPa and the Sauer A hardness is 69.