制备工艺对LDPE/MVQ-SiO_2并用胶性能影响的研究  

Effect of preparation technology on the properties of the LDPE/MVQ-SiO_2 hybrid rubber

作　　者：丁运生[1] 张效敏[1] 胡光政 贺奎[1] 周文祥[1] 廖雄兵[1] 

机构地区：[1]合肥工业大学化学工程学院,安徽合肥230009 [2]安徽华菱电缆集团有限公司,安徽巢湖238371

出　　处：《合肥工业大学学报（自然科学版）》2007年第8期980-983,共4页Journal of Hefei University of Technology：Natural Science

基　　金：国家自然科学基金重大资助项目(10590355);安徽省自然科学基金资助项目(50440905)

摘　　要：在双辊开炼机上实现沉淀法白碳黑(SiO2)和甲基乙烯基硅橡胶(MVQ)的共混复合,制备出了MVQ混炼胶(MVQ-SiO2)。通过熔融共混和两段硫化的方法实现低密度聚乙烯(LDPE)和MVQ混炼胶的熔融共混,制备出LDPE/MVQ-SiO2并用胶。研究表明,在MVQ-SiO2的制备过程中加入质量为SiO2质量的0.5%的甲基乙烯基硅油可改善硫化成型后的LDPE/MVQ-SiO2并用胶的耐热老化性能和拉伸性能,硬度和扯断伸长率基本不变,但耐撕裂强度有所下降;制备LDPE/MVQ-SiO2并用胶时,加入质量为LDPE质量的1%的抗氧剂,可防止并用胶胶料在第2段硫化过程中,由于LDPE热降解所引起的材料性能劣化;在抗氧剂和硫化剂共同作用下,并用胶胶料合适的第2段硫化条件是200℃,硫化2 h。By blending the precipitated silica（SiO2） and the MVQ by the two-roll mixer at ambient temperature, the composites of MVQ-SiO2 were got, and then the low density polyethylene（LDPE）/MVQ- SiO2 hybrid rubber was prepared via melting blend and after two-stage vulcanization. In the stage of preparing MVQ-SiO2, the methyl vinyl silicon oil, the mass of which was 0.5 % of the mass of precipitated silica, was added into the MVQ together with SiO2 at the same time,and the results show that the anti-heat aging property and the tensile property of the LDPE/MVQ-SiO2 hybrid rubber were promoted, but the Shore A hardness and the elongation at break maintained, and the tearing strength decreased somewhat. The results also show that the anti-heat aging property decreased with the increasing of the LDPE in the LDPE/MVQ-SiO2 hybrid rubber, and as the antioxidant, the mass of which was 1% of the mass of LDPE, was added into the hybrid rubber,the LDPE/MVQ-SiO2 hybrid rubber were prevented from deteriorating in its properties due to the heat degradation of LDPE in the second stage of vulcanization. Considering the interaction of the curing agent with the antioxidant, the suitable second stage vulcanization conditions were 200℃ and 2 hours in this study, and thereby the LDPE/MVQ-SiO2 hybrid rubber could get better integrated properties.

关 键 词：低密度聚乙烯 甲基乙烯基硅橡胶 硫化 抗氧剂 甲基乙烯基硅油 热老化性能 

分 类 号：TQ32[化学工程—合成树脂塑料工业]