橡胶材料加速老化试验与寿命预测方法研究进展

简要概述了橡胶材料加速老化试验方法,并总结了橡胶材料寿命预测方法在动力学、计算机仿真及本构模型领域的新进展。     

三元乙丙橡胶热氧老化试验与密封条寿命预测

运用热空气加速老化试验方法对塑钢窗密封条用三元乙丙橡胶进行了不同温度下的老化,并对其使用寿命进行了预测。首先建立了基于Arrhenius原理的老化寿命预测模型,然后对该数学模型进行了验证和统计分析。结果表明,模型预测结果与实验值吻合很好,相关系数大于0.99。根据预测值与试验值的偏差对预测模型进行了进一步修正,根据修正后的模型预测得到30℃下、拉断伸长率保持率在70%时,密封条的使用寿命为68.73年。     

橡胶材料加速老化试验及其寿命预测方法

综述橡胶材料加速老化试验及其寿命预测的各种方法,探讨了它们的特点和失真问题,并提出了相关的处理方法。     

橡胶加速老化试验及贮存期推算方法

本文综述了橡胶加速老化试验及贮存期推算方法,并对常用的贮存期推算方法进行了比较,最后对橡胶加速老化研究中存在的一些问题提出了看法。     

三元乙丙橡胶的热氧老化及寿命预测

以拉断伸长率和压缩永久变形为评价性能,应用阿累尼乌斯方程对三元乙丙橡胶进行了寿命预测。研究了热氧老化对三元乙丙橡胶物理力学性能和分子结构的影响。结果表明,该三元乙丙橡胶在高温下具有优异的拉伸性能,高温会导致其他物理力学性能劣化、交联密度增大和分子链断裂。该三元乙丙橡胶在压缩状态下的贮存寿命为9.3年。应用阿累尼乌斯方程进行寿命预测时,测试性能、临界值和试验温度的选择直接影响结果的准确性,必须根据实际使用情况综合考虑、谨慎选择。     

三元乙丙橡胶热氧老化性能研究及寿命预测

采用热空气加速老化试验,研究了不同温度下三元乙丙橡胶(EPDM)力学性能变化,并对其使用寿命进行了预测.结果表明,随着热氧老化时间的延长,硫化胶硬度和定伸应力不断增大,拉伸强度先增大后减小,拉断伸长率不断下降;温度越高,硫化胶老化速度越快;以拉断伸长率作评价指标,通过Arrhenius拟合方程可推算出EPDM在不同温度...     

某橡胶减振垫加速老化试验与寿命预测

<正>橡胶减振垫具有衰减吸收高频振动和噪声,以及体积小、重量轻等优点,在机车和轨道交通减振方面得到广泛应用。通常情况下,橡胶减振垫在外界恶劣自然环境和车辆行驶过程中的周期机械应力影响下,使用一段时间后,在其受力方向会产生永久变形或是产生裂纹,甚至发生破坏,影响车辆运行的舒适性和安全性。为此,针对某轨道交通用橡胶减振垫开展了加速老化试验并作了寿命预测。     

橡胶在空气压力下的热老化试验方法

1范围1．1本试验方法叙述了温度的升高和空气压力对硫化橡胶物理性能影响的测定方法c由本试验结果可能得不到准确的与使用性的相关性，因为使用条件变化范围大。然而，用本试验方法可以根据实验室结果的比较来评价橡胶配方，最适宜用于评价温度升高和有空气压力的条件下的性能。注1——较接近自然老化的不严酷条件下评价硫化橡胶时，推荐使用试验方法D573和Ch6501．2用SI单位制表示的值被认为是标准的。在括号内的值仅作参考。1．3本标准可能涉及到有危险的材料、操作和设备。本标准不说明与使用标准有关的所有安全问题。在使用前建立适当…     

硫化橡胶热氧（管式仪）老化试验方法研究

本文介绍了不同氧气压力和温度,试样规格对硫化橡胶老化性能的影响。提出制订《硫化橡胶热氧(管式仪)老化试验方法》的最适宜的试验条件和试样老化后性能变化的评价方法。     

基于加速老化试验的软丁腈橡胶贮存寿命预测

基于橡胶加速老化试验,利用阿累尼乌斯方程,外推室温下软丁腈橡胶扯断伸长率随贮存时间的变化关系,预测出软丁腈橡胶的室温贮存寿命。     

丁基橡胶热氧老化性能的研究

通过改变配方中酚醛树脂的用量和卤素给予体的种类及用量,探讨了各变量下对IIR硫化特性和耐热氧老化性能的影响。实验表明,老化前后,300%定伸应力和硬度均有所提高,而拉伸强度、撕裂强度和拉断伸长率有不同程度下降。在树脂用量为8份、CIIR用量为11份、BIIR用量为9份时,各配方的IIR硫化胶性能最好。     

三元乙丙海绵橡胶垫热老化寿命之研究

三元乙丙海绵发泡产品在越来越多的领域里得到了推广和应用。文中主要针对三元乙丙橡胶（EPDM）海绵发泡蛰板的热老化使用寿命进行了分析、研究并计算。研究结果表明,EPDM海绵发泡橡胶垫板在40℃以下性能下隆20%时,产品仍可正常使用43年。     

天然橡胶光/热氧老化及抗老化性能研究进展

对天然橡胶的老化失效行为,特别是光/热氧老化机理进行了总结,同时综述了自然老化和人工加速老化等常见老化方法及天然橡胶的防老化技术,并展望了天然橡胶防老化技术未来的发展趋势。     

胶料热老化性能试验

对以天然橡胶和顺丁橡胶并用的胶料,在无防老剂和有防老剂状态下分别进行热老化和热氧老化对比试验,试验表明,试片在无氧热老化条件下胶料的性能下降很少,而且经较长时间硫化的试片对胶料热氧老化性能略有提高.配方中增用防老剂后,明显提高了胶料的耐热氧老化性能,特别是经较长时间硫化的试片热氧老化性能更进一步提高.     

Effects of different drying methods on the microstructure and thermal oxidative aging resistance of natural rubber

In this work, the wet natural rubber granules were dried by hot air and by microwave at 115°C, respectively; the morphological structures of dried natural rubber granules were studied by using a scanning electronic microscope, whereas the thermal oxidative properties of dried natural rubber granules were investigated by comparison of variation in properties before and after aging, and the changes in the thermal oxidative decompose temperatures. The results showed that it needed 13.47 min for microwave drying and 210.00 min for hot air drying to reduce the moisture content of wet natural rubber to the required value. The granules of natural rubber dried by microwave were of rough surfaces and the cutting traces produced during the processing of wet natural rubber remained on the natural rubber surface; whereas, the natural rubber granules dried by hot air were of smooth surfaces, and the cutting traces produced during the processing of wet granules disappeared. The thermal oxidative resistance of vulcanized natural rubber dried by microwave improved significantly. The initial plasticity (P₀), plasticity retention index, and thermo‐oxidative decomposition temperature of natural rubber dried by microwave were higher than those of natural rubber dried by hot air. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012     

Effects of crosslinking densities on mechanical properties of nitrile rubber composites in thermal oxidative aging environment

The effects of crosslinking densities on mechanical properties of nitrile rubber (NBR) composites before and after thermal oxidative aging are investigated. Tensile strengths of NBR composites are enhanced slightly at the initial aging stage, attributing to moderate increment of crosslinking densities. Continuous decrease with further aging is followed, resulting from over-crosslinking and uneven distribution of crosslinking densities. The digital image correlation method is explored for large-strain deformation measurement by displacement accumulation and establishing strain model, being promising in practical age detection and measurement of mechanical properties in complex environments. Compression sets are gradually increased with aging because of the destruction of the original crosslinking structures. The molecular chains fracture inhibits elastic recoveries of compressive NBR composites and results in residual deformation in thermo-oxidative and compressive environment after unloading. This study provides new ideas for exploring mechanical properties of rubber-based composites before and after thermal oxidative aging.     

GSD-01硅橡胶热空气加速试验及贮存寿命预估研究

采用衰减全反射红外光谱(ATR-IR)分析确定合适的加速老化试验温度,以热空气高温加速试验方法,得到GSD-01硅橡胶压缩永久变形随加速温度和时间的变化规律,通过回归分析计算其在25℃下的贮存寿命.结果表明:GSD-01硅橡胶在100～150℃的加速温度下遵循相似的老化机理,其压缩永久变形随老化温度提高和时间延长逐渐增...     

Accelerated thermal ageing studies of polydimethylsiloxane (PDMS) rubber

Thermal ageing studies over relative high temperature range (from 250 °C to 85 °C) have been conducted on polydimethylsiloxane (PDMS) rubber with the aim of investigating ageing behavior. Tensile elongation, compression set and creep measurements are introduced to monitor the ageing process. Time temperature superposition is performed and the linear trends are found in the Arrhenius plots for all the approaches, revealing an identical process dominates the degradation process. Activation energies are found to be depended on the methods used, which are 88.5 kJ/mol for tensile tests, 67.7 kJ/mol for compression set measurements and 75.3 kJ/mol for creep measurements. The phenomenon that activation energy obtained from tensile elongation is always higher than other approaches is rationalized by the sensitive modification of thermal degradation on the rubbery network. Moreover, correlations between the results from different approaches have been examined. The linear relationships have been found between tensile elongation and creep or compression set measurements for the three methods are all influenced by the network structure.