共查询到19条相似文献,搜索用时 78 毫秒
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研究了4种不同环氧化度的稀土异戊橡胶(EIR)的生胶,混炼胶及硫化胶性能。结果表明,随着环氧化度(摩尔)从10%增至50%,EIR的Tg由-54℃升至-30℃,但它们(除EIR-50外)的混炼行为与稀土异戊橡胶(Ln-IR)相当,混炼胶表面平整光滑,随着环氧化度增加,混炼胶硫化速度加快,硫化平坦区较窄,且具有明显的硫经返原现象,硫化胶的300%定伸应力,拉伸强度,硬度,磨耗等增加,而20^#机油和 相似文献
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CNAS-RL02:2012《能力验证规则》中规定,申请认可和已获认可的实验室,根据检验领域和项目,选择1次/1年或1次2年的周期参加相关项目的能力验证或测量审核,没有能力验证计划的项目可选择与权威机构进行比对,也可以选择参加权威机构组织的实验室间比对,证明其检验项目在该领域的检验能力。在合成橡胶行业中对外具备国家资质的实验室不多,由于能力验证计划涉及的检验项目有限,为满足合成橡胶行业检验水平的提升和检验技术的进步,国家合成橡胶质量监督检验中心勇于承担社会责任,策划组织40家合成橡胶行业所属的实验室,开展了异戊橡胶门尼粘度的比对工作。比对结果统计与分析采用稳健统计技术,统计结果反映合成橡胶行业测试水平。异戊橡胶IR60、IR80门尼粘度实验室间的比对,各参加实验室使用门尼粘度标准物质校准门尼粘度计,Z值绝对值平均值均小于0.8,满意结果均在95%以上,没有出现离群值,各实验室的测试水平较以往有大幅度提升。 相似文献
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异戊橡胶应用技术及其发展前景分析 总被引:2,自引:0,他引:2
介绍了异戊橡胶(IR)与天然橡胶在微观结构、力学性能和加工工艺上的特点,综述了IR在轮胎、橡胶制品及其他行业的应用情况和市场行情,并对我国IR的发展提出了建议。 相似文献
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The effect of liquid isoprene rubber (LIR) on the dynamic mechanical properties of emulsion‐polymerized styrene/butadiene rubber (ESBR) vulcanizates was investigated by temperature sweep using dynamic mechanical analysis. The introduction of LIR led to ESBR vulcanizates having higher loss factor (tan δ) in the temperature range ? 30 to 0 °C, and lower tan δ in the range 60 to 80 °C. A small amount of LIR‐403 (LIR with carboxyl groups) led to a significant change in tan δ: the addition of LIR‐403 (3 phr) led to a 7.5% increase in tan δ from ? 30 to 0 °C, and a 24.9% decrease in tan δ from 60 to 80 °C. It was found that the introduction of LIR increased the bound rubber content in the ESBR compound. Equilibrium swelling experiments showed that the crosslink density of the vulcanizates increased after the introduction of LIR‐403 or LIR‐50 (general purpose LIR). The change in tan δ from 60 to 80 °C was related to polymer–filler interactions. The characteristic constant of filler–ESBR matrix interaction (m) was calculated. At a given filler volume fraction, the increase in m in the presence of LIR could be well related to the decrease in tan δ from 60 to 80 °C. The influence of LIR on filler network in the ESBR compound was also investigated by strain and temperature sweeps using a rubber processing analyzer. Copyright © 2011 Society of Chemical Industry 相似文献