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采用微波处理打断废胶粉(WRP)的三维网状结构用来提高WRP在有机溶剂中的溶胀性,然后采用溶胶凝胶法,将微波改性后的WRP浸入正硅酸乙酯中,通过水解反应和缩合反应,在WRP表面原位生成SiO2网络,从而制得改性废胶粉(MWRP).将制得MWRP与天然橡胶(NR)共混,制备了NR/MWRP复合材料,研究了NR/MWRP复合材料的性能.通过热重分析仪、差示扫描量热仪和力学分析表明微波处理最佳时间是20 s.由于微波处理提高了NR与WRP的相容性,原位生成的SiO2粒子起到了补强作用,所以所制备的NR/MWRP复合材料拥有较好的力学性能;随着Si69的加入,抑制了SiO2粒子聚集,提高了SiO2粒子的分散性,从而进一步提高复合材料的力学性能并降低复合材料的Payne效应;在进行频率扫描时,硫化胶的储存模量随频率的增大而增大;硫化胶的温度扫描结果表明,随着温度的升高,复合材料中SiO2粒子聚集程度加剧并且复合材料出现老化的现象.为了提高复合材料的耐老化性能,N,N-间苯撑双马来酰亚胺(BMI)作为一种防老剂加入复合材料中,BMI利用Diels-Aider反应补偿橡胶在老化过程中所损失的交联键并提高NR与WRP的界面相容性,从而提高复合材料的耐老化性能.
Microwave disruption of three-dimensional network structure of waste rubber powder (WRP) to improve the swelling of WRP in organic solvents, and then using the sol-gel method, the microwave-modified WRP immersed in tetraethyl orthosilicate, Through the hydrolysis reaction and the condensation reaction, the SiO2 network was formed on the surface of WRP in situ to produce modified scrap rubber powder (MWRP). The prepared MWRP and natural rubber (NR) were blended to prepare NR / MWRP composites The performance of NR / MWRP composites was investigated by TG, DSC and mechanical analysis.The results showed that the optimum time for microwave treatment was 20 s.Because microwave treatment improved the compatibility between NR and WRP, Of SiO2 particles play a reinforcing role, so the prepared NR / MWRP composite material has good mechanical properties; with the addition of Si69, inhibiting the aggregation of SiO2 particles, increasing the dispersion of SiO2 particles, thereby further enhancing the composite material The mechanical properties of composites and the Payne effect of composites were reduced. The storage modulus of vulcanizates increased with the increase of frequency when frequency scanning was performed. The results of temperature scanning of vulcanizates showed that with the increase of temperature, SiO2 particles intensified and complex In order to improve the anti-aging properties of composite materials, N, N-m-phenylenebismaleimide (BMI) as an antioxidant added to the composite material, BMI using Diels-Aider reaction compensation rubber in Aging process lost crosslinks and improve the NR and WRP interface compatibility, thereby enhancing the composite anti-aging properties.