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研究天然橡胶硫化胶中炭黑类型的鉴定。结果表明:与原材料炭黑相比,硝酸氧化法回收炭黑外表面积N220增大约4%,N375增大约11%,其余几种增大6%~8%,除炭黑N326和N660外,其余炭黑总表面积均大幅增大;热裂解法回收炭黑外表面积炭黑N121几乎没有变化,N134,N220,N234,N326和N375,N660分别增大约10%,6%,2%,24%和58%,总表面积变化不大。根据两种方法回收炭黑比表面积测试结果,结合制品实际应用背景,可推断炭黑类型。 相似文献
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通过研究NR/BR并用比、炭黑品种和用量以及硫化体系对NR/BR并用胶压缩永久变形的影响,得到一种压缩永久变形(100 ℃×70 h、压缩率25%)小于20%的NR/BR减震支座胶料的优化配方.试验结果表明,随着BR用量增大,NR/BR并用胶压缩永久变形先减小后增大;使用炭黑N774和N550以及过氧化物硫化体系能有效降低NR/BR并用胶压缩永久变形.优化配方为:NR/BR 70/30,炭黑N774 60,氧化锌 5,硬脂酸 1,环烷油 12,硫化剂DCP 3,助硫化剂HVA-2 2. 相似文献
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炭黑填充NR和S—SBR硫化胶动态性能及屈挠破坏性的研究 总被引:1,自引:0,他引:1
探讨炭黑种类及用量对天然橡胶(NR)和溶聚丁苯橡胶(S—SBR)硫化胶的耐屈挠破坏性及动态力学性能的影响。结果表明,随着炭黑N234、N330用量的增大,NR和S—SBR两种硫化胶的耐屈挠破坏性降低;随炭黑粒径增大,炭黑用量对两种硫化胶的耐疲劳破坏性的影响逐渐减小;NR硫化胶的耐初始疲劳破坏性明显优于S—SBR硫化胶,随屈挠次数的增加,两者间的差距逐渐减小。炭黑用量增加,NR和S—SBR硫化胶的损耗因子峰值(tanδmax)减小,高于10℃时(高弹态)的tanδ值增大,S—SBR较NR具有更好的抗湿滑性和相差无几的低滚动阻力。炭黑粒径减小,NR和S—SBR硫化胶的tanδmax减小,填充30质量份炭黑时,N660增强的两种硫化胶在0℃时tanδ值较高,60℃时最低,具有较好的动态性能。 相似文献
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硫化温度对NR高温下拉伸/撕裂性能的影响 总被引:2,自引:0,他引:2
采用74个不同的硫化温度硫化NR,并测试其高温下拉伸/撕裂性能、交联密度和炭黑分散情况。结果表明:随测试温度的提高,NR的拉伸强度和撕裂强度均呈现逐渐下降的趋势,且在同-测试温度下,硫化胶的拉伸强度随着硫化温度的升高而逐渐降低;在测试温度小于100℃时,硫化胶的撕裂强度随硫化温度的升高而逐渐升高,测试温度大于100℃时,硫化胶的撕裂强度随硫化温度的升高而逐渐降低。 相似文献
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乙烯酮(双乙烯酮)是十分重要的化工中间体,其下游产品较多。江苏某化工厂开发生产乙烯酮(双乙烯酮)下游产品三十多个,年生产规模三万多吨,是国内以乙烯酮(双乙烯酮)为中间体生产精细化学品的综合骨干企业。针对乙烯酮(双乙烯酮)下游产品废水特点,该厂结合企业实际,开展了产品优化,结构调整,清洁生产,资源循环利用,节水降耗等工作,从源头削减了污染物的生产。同时投资二千多万元新建预处理装置三套,6000m3/d废水生化处理装置一套,使全厂乙烯酮(双乙烯酮)下游产品的废水得到了有效的治理。 相似文献
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The objective of the study was to explore the effect of the degree of deacetylation (DD) of the chitosan used on the degradation rate and rate constant during ultrasonic degradation. Chitin was extracted from red shrimp process waste. Four different DD chitosans were prepared from chitin by alkali deacetylation. Those chitosans were degraded by ultrasonic radiation to different molecular weights. Changes of the molecular weight were determined by light scattering, and data of molecular weight changes were used to calculate the degradation rate and rate constant. The results were as follows: The molecular weight of chitosans decreased with an increasing ultrasonication time. The curves of the molecular weight versus the ultrasonication time were broken at 1‐h treatment. The degradation rate and rate constant of sonolysis decreased with an increasing ultrasonication time. This may be because the chances of being attacked by the cavitation energy increased with an increasing molecular weight species and may be because smaller molecular weight species have shorter relaxation times and, thus, can alleviate the sonication stress easier. However, the degradation rate and rate constant of sonolysis increased with an increasing DD of the chitosan used. This may be because the flexibilitier molecules of higher DD chitosans are more susceptible to the shear force of elongation flow generated by the cavitation field or due to the bond energy difference of acetamido and β‐1,4‐glucoside linkage or hydrogen bonds. Breakage of the β‐1,4‐glucoside linkage will result in lower molecular weight and an increasing reaction rate and rate constant. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 3526–3531, 2003 相似文献
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我厂3号回转窑(Φ4m×60m)生产线在1996年年底由SP窑(产量912t/d)改为NSP窑(产量1320t/d),预分解系统为四级旋风预热器带离线式分解炉 相似文献
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Conclusions It is significant that the purification on a single passage of viscose through porous ceramic corresponds to the result of a two-stage filtration of it in industrial filter-presses with standard fillings.Kiev Combine. Kiev Technological Institute of Light Industry. Translated from Khimicheskie Volokna, No. 3, pp. 20–22, May–June, 1969. 相似文献
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A refined nonlinear value of the main parameter of a material, i.e., the elongation modulus versus the instant temperature value, was suggested for introduction into the computational algorithm of tempering stresses. 相似文献
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