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将液态环氧树脂(EP)在密炼阶段混合到天然橡胶(NR),制备了NR/EP复合材料。对NR加入EP进行DSC测试热分析表明,天然橡胶助剂中硬脂酸可促进环氧树脂固化;橡胶加工分析和交联度测试发现,较多环氧树脂可减缓天然橡胶的硫化反应并减小交联度,降低最大混炼扭矩和平衡扭矩,减弱甚至抑制其返原;升高混炼温度可加速NR硫化进程但降低其交联度,抑制NR返原的最小EP含量增大。NR硫化剂被EP吸收固化包裹则降低了NR交联度;EP和NR黏度差异大,EP固化后容易造成NR内结构分布不均匀;这两方面降低了复合材料的拉伸强度和撕裂强度。
The liquid epoxy resin (EP) was mixed into the natural rubber (NR) during the mixing stage to prepare the NR / EP composite. DSC analysis of NR adding EP shows that stearic acid can accelerate the curing of epoxy resin in natural rubber additives. Rubber processing analysis and cross-linking degree test show that more epoxy resin can slow the vulcanization reaction of natural rubber and reduce Reduce the maximum mixing torque and balance torque, weaken or even inhibit its reversion. Increasing the mixing temperature can accelerate the NR curing process but decrease the degree of crosslinking and the minimum EP content that inhibits NR reversion. NR vulcanizing agent is absorbed by EP to reduce the crosslinkability of NR; the difference between the viscosity of EP and NR is large, and the structure of NR can easily lead to the uneven distribution of the structure after EP curing; both of them reduce the tensile strength and tear strength of the composite .