酸性活性修饰剂对白泥/丁腈橡胶复合材料力学性能的影响

利用丙烯酸和对乙烯苯磺酸作为白泥的修饰剂,对白泥进行湿法修饰,而后利用石蜡对白泥进行二次包覆制备了有机修饰活性白泥,并将其作为橡胶填料填充到丁腈橡胶(NBR)中制备了修饰白泥/NBR(400:100)母胶,而后将母胶填充到NBR中制备了不同白泥含量的白泥/NBR复合材料。考察了不同修饰量制备的母胶对复合材料硫化性能的影响、母胶及用量对NBR复合材料的性能影响。实验结果表明:当加入修饰剂的用量逐步增加(以干白泥质量计算)时,母胶填充的白泥/NBR复合材料的力学性能呈现先增大后减小的趋势。酸性活性剂用量为白泥2%的母胶且母胶份数为100phr时其白泥/NBR复合材料的力学性能达到最佳值。但是两种活性修饰剂修饰的白泥母胶在改性NBR性能上存在差异:丙烯酸修饰白泥母胶制备的白泥/NBR复合材料的力学性能为拉伸强度8.3MPa、扯断伸长率386%、300%定伸应力3.7MPa、硬度79;乙烯苯磺酸修饰白泥母胶的力学性能为拉伸强度9.8MPa、扯断伸长率652%、300%定伸应力4.2MPa、硬度78。研究表明:利用丙烯酸、对乙烯苯磺酸作为白泥的修饰剂并制备橡胶母胶可大幅度提高橡胶材料的力学性能,可作为白泥综合利用的一种有效方法。

Effect of reactive acidic modifiers on the mechanic properties of lime mud/NBR composites

Lime mud was modified by wet method using acrylic acid or vinyl benzenesulfonic acid as modifier, and further coating of the modified lime mud was performed using paraffin to obtain the reactive organic modified lime mud.The lime mud/NBR (400:100) master-batch prepared with the reactive organic modified lime mud as rubber filler was used to prepare lime mud/NBR composites at different loadings of lime mud.The effect of the master-batch dosage on the performance of the composites was examined.Experimental results showed that the mechanical performance of the composite materials increases first and then decreases with the increasing of the dosage of the adding modifier (in terms of quality of dry lime mud).The best mechanical performance of the composite materials was achieved when the acid surfactant dosage was 2% of the white clay master-batch and the master-batch copies was 100phr.The effect of the modifiers on the mechanical performance of the composite was examined.For the composite materials with acrylic modified lime mud master-batch, the tensile strength is 8.3MPa, elongation at break is 386%, 300% modulus is 3.7MPa, and the Shore "A" is 79.And for the composite materials with vinyl benzene sulfonic acid modified lime mud master-batch, tensile strength is 9.8 MPa, elongation at break is 652%, 300% modulus is 4.2MPa, and the Shore "A" is 78.The results showed that the mechanical properties of rubber material could be improved greatly by using the modifiers.