共查询到19条相似文献,搜索用时 56 毫秒
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用回归分析法对NBR制备吸水膨胀橡胶的吸水膨胀性和物理机械性能进行了研究.结果表明,吸水膨胀橡胶的吸水膨胀率随吸水树脂用量增加而增大,拉伸强度和拉断伸长率随吸水树脂用量增加而降低;随炭黑用量增加,物理机械性能提高,但体积膨胀率明显下降;建立的数学模型能较好地拟合炭黑和吸水树脂用量与胶料各项性能之间的关系. 相似文献
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吸水膨胀橡胶(WSR)是一种具有优良吸水性和弹性的特种橡胶,在密封防水等方面有着广泛的应用前景。本文主要研究不同吸水树脂、增容剂与增容剂/吸水树脂比例对NR基共混型吸水膨胀橡胶性能的影响,并进一步考查吸水剂含量对WSR性能的影响。通过正交实验,得出了制备吸水膨胀橡胶的最佳组合;实验表明随吸水剂含量增加,WSR的吸水率增大,力学性能变差。 相似文献
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本文以聚丙烯酸钠为主要原料,用抗坏血酸/过氧化氢为引发体系合成了聚丙烯酸钠系吸水树脂,并将所制备的吸水树脂与天然橡胶制备成吸水膨胀橡胶,考察了甲基丙烯酸缩水甘油酯(GMA)与丙烯酸钠的比例对吸水树脂性能及其吸水膨胀橡胶性能的影响。实验结果表明, GMA改性吸水树脂对吸水树脂及其吸水膨胀橡胶性能的吸水性能有较大的影响,同时GMA改性吸水树脂可与橡胶共硫化。当GMA的物质量比为2%时,制备的吸水橡胶各项性能最佳,力学性能较佳,橡胶吸水膨胀过程中,吸水树脂析出现象显著降低。 相似文献
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大型硅橡胶密封圈的优化设计 总被引:1,自引:0,他引:1
对应用于负能炼钢转炉煤气回收系统的大型硅橡胶密封圈进行优化设计.结果表明,在模具非工作面开2~4个直径为2 mm的溢胶孔可以防止产品产生缩裂;选用中低温硫化剂可以缓解和消除产品缩裂现象;采用不同的硫化体系、适宜的硫化温度和工艺可以解决成品的尺寸偏差问题. 相似文献
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全钢载重子午线轮胎胎肩垫胶配方的优化设计 总被引:1,自引:1,他引:0
对全钢载重子午线轮胎胎肩垫胶配方进行优化设计.结果表明,通过减少炭黑用量,加入白炭黑和硅烷偶联剂,不使用增粘树脂,试验胶料的定伸应力提高,对降低胶料的动态和压缩生热有良好作用;配方中使用抗硫化返原剂Perkalink 900,可明显提高胶料抗热降解性能;采用试验胶料试制的成品轮胎耐久性能较好. 相似文献
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Anisotropic swelling of thin EPDM discs is observed when they are in contact with toluene resulting from the liquid absorption. The process is controlled by transient diffusion, with a concentration-dependent diffusivity and a finite coefficient of convective transfer at the liquid-rubber interface. Moreover a rather high swelling takes place during the stage of absorption, leading to an increase in dimensions of the flat discs. The increase in the thickness of the discs is around 1.17-1.18 times larger than that in the radius, exhibiting an anisotropic behaviour. The flat discs have been cured by pressing them in the heated slabs of a press, leading to a kind of orientation of the molecules. The state of cure of around 96% has been determined either by calorimetry in scanning mode or by a moving die rheometer under isothermal conditions at three temperatures within the 170-190 °C range. Various percent peroxide as a vulcanising agent have been used, e.g. 2, 10, and 20%. While the diffusivity is about similar for the three samples, the extent of liquid absorbed decreases with the percent peroxide. A numerical model based on finite differences taking into account all these facts has been built in order to describe the process. 相似文献
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The results of experimental and theoretical investigation of epoxy EDT- 10/glass-bead plastics at long-term (10 years) exposure in water are presented. The curves of water absorption and swelling are determined. It was expected that the addition of hollow glass spheres (beads) must substantially reduce the sorptional capacity of a material, because of reduction of the volume content of the matrix, and therefore, because of reduction of the volume where the molecules of water can diffuse. However, the water absorption process in glass-bead filled plastics was found to continue during the total term of the experiments without a tendency to stop. After ten years the equilibrium state was not achieved and the concentration of water in the composite specimens became more than the equilibrium concentration of water in unfilled EDT-10 epoxy. The swelling coefficient was found to be a non-linear function of water content. It was found that the initial parts of experimental curves of water absorption and swelling (during the first year of exposure) show an agreement with calculated data, good enough for engineering applications. Subsequently the discrepancy between the experimental results and calculated data increased. The possible reasons for such a discrepancy are discussed. 相似文献