填料及增塑剂对聚硫型道路灌缝胶性能的影响研究

Research on the influence of fillers and plasticizers on the performance of polysulfide road potting sealant

采用轻质CaCO_(3)、重质CaCO_(3)、高岭土和纳米ZnO作为聚硫型道路灌缝胶的填料进行对比,气相SiO_(2)作为补强填料加入到灌缝胶中,并选用了两种增塑剂邻苯二甲酸二丁酯(DBP)和邻苯二甲酸丁苄酯(BBP)进行比较。研究了不同填料、增塑剂的类型以及掺量对聚硫型道路灌缝胶性能的影响,同时确定了配制聚硫型灌缝胶的填料及增塑剂的最佳掺量。研究结果表明:轻质CaCO_(3)作为填料制备的聚硫型灌缝胶具有更好的力学性能,并且能够在体系中更好地分散;BBP相较于DBP更加绿色环保,不容易污染基材,因此填料和增塑剂分别选用轻质CaCO_(3)和BBP。通过对其力学性能、微观形貌、分散情况和热稳定性的研究后认为,当轻质CaCO_(3)的最佳掺量为200份、BBP的最佳掺量为80份时,所制备的聚硫型灌缝胶的综合性能较好。

A comparison was made by using lightweight CaCO3,heavy CaCO3,kaolin,and nano ZnO as fillers for polysulfide road potting sealant.Fumed SiO2 was added as the reinforcing filler to the sealant,and two kinds of plasticizers,dibutyl phthalate(DBP) and butyl benzyl phthalate(BBP) were selected for comparison.The influence of different types and dosages of fillers and plasticizers on the performance of polysulfide road potting sealant was studied,at the same time,the optimal dosage of filler and plasticizer for polysulfide potting sealant was determined.The research results showed that the polysulfide potting sealant prepared with lightweight CaCO3 as filler had better mechanical properties and could be better dispersed in the system.Compared to DBP,BBP was more environmentally friendly and less prone to contaminating the substrate.Therefore,lightweight CaCO3 and BBP were selected as filler and plasticizer,respectively.After studying their mechanical properties,microstructure,dispersion,and thermal stability,it was believed that the comprehensive performance of the prepared polysulfide potting sealant was relatively good when the optimal dosage of lightweight CaCO3 was 200 parts and the optimal dosage of BBP was 80 parts.