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研究国产无亚硝胺的硫黄给予体TB710(硫化剂TB710,主要成分为对叔丁基苯酚二硫化物)在轮胎气密层胶中的应用,并与进口同类产品硫化剂Vultac TB710(烷基苯酚二硫化物)进行对比。结果表明:采用硫黄/硫化剂TB710/促进剂DOTG/促进剂MBTS硫化体系替代硫黄/促进剂TMTD/促进剂MBTS硫化体系,胶料的焦烧时间缩短,自粘性提高,交联密度增大,抗硫化返原性能提高;硫化胶的定伸应力、拉伸强度和撕裂强度增大,耐热老化性能改善,气密性提高;国产硫化剂TB710与进口硫化剂Vultac TB710性能相当。 相似文献
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研究不产生亚硝胺的促进剂Vultac TB710(硫黄给予体)在三元乙丙橡胶中的应用。结果表明:促进剂Vultac TB710完全替代促进剂TMTD-80/DPTT-75/DTDM-80,胶料的硫化速度明显减慢,硫化胶的拉伸强度、拉断伸长率和压缩永久变形增大,增大促进剂Vultac TB710用量,胶料的硫化速度提高;促进剂Vultac TB710的有效成分烷基苯酚二硫化物硫化时分解生成的烷基苯酚自由基或烷基硫自由基与受阻酚结构酚类防老剂具有相似的结构特点,其具有明显的热氧防护性能。 相似文献
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烷基苯酚二硫化物是一种不产生亚硝胺的新型硫磺给予体,可全部或部分取代硫磺、二硫代二吗啡啉(DTDM)等用于有效或半有效硫化体系。采用烷基苯酚二硫化物硫化的硫化胶具有优异的拉伸强度、耐热氧老化性及抗硫化返原性,而且不污染胶料,具有很好的应用前景。 相似文献
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CIIR/NR(70/30)并用胶采用烷基苯酚二硫化物APD作硫化剂,取代部分硫黄硫化,胶料的拉伸强度、撕裂强度、交联程度及耐屈挠龟裂性能明显提高,且随着APD用量的增加,胶料的以上性能进一步提高,但加剧了焦烧倾向。加入0.2份APD的试验配方总体物性优于生产配方。试验胶料工艺性能优良,成品气密性能满足国家标准。 相似文献
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研究硫化体系中硫黄和促进剂用量对全钢载重子午线轮胎胎侧胶性能的影响。结果表明:在胎侧胶配方中减小硫黄用量并增大促进剂TBBS用量,胶料的硫化特性和老化前物理性能变化不大;当硫黄/促进剂TBBS用量比为1.5/2.3时,胶料的物理性能、耐老化性能和动态力学性能最佳。 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