共查询到20条相似文献,搜索用时 658 毫秒
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几种不同防焦剂在硫黄硫化天然橡胶共混胶料中,随着促进剂的品种和几种促进剂并用的变化,在硫化系统中的作用机理和大小是不同的。对胶料焦烧和硫化胶的性能以及热老化的影响也是不相同的。 相似文献
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考察了2-巯基苯并噻唑(促进剂M)在天然橡胶中的硫化性能及对物性和胶料加工性的影响。促进剂M试样的性能已达到工业标准样品的水准。在天然橡胶胶料中,与2,2′-二硫代苯并噻唑(促进剂DM)相比,促进剂M具有增塑性略高、焦烧速度与硫化速度较快、硫化活化能较低、硫化胶引张强度等性能略低而耐热老化性较好的特点。 相似文献
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硫化体系对天然橡胶性能的影响 总被引:1,自引:0,他引:1
研究普通硫化体系和半有效硫化体系对天然橡胶(NR)各项性能的影响。结果表明:与普通硫化体系NR胶料相比,半有效硫化体系NR胶料的硫化返原程度小,物理性能、压缩疲劳性能、耐磨性能和耐热老化性能好,且随着促进剂用量的增大性能更优,但耐切割性能变差;随着硫化时间的延长,普通硫化体系和半有效硫化体系NR胶料的压缩疲劳温升和磨耗量均增大,且普通硫化体系胶料增幅更大。 相似文献
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研究硫黄、促进剂NS和硫化剂DTDM用量对天然橡胶(NR)胶料性能的影响。在半有效硫化体系中,当硫黄用量为1.8~2份,促进剂NS用量为1.4~1.6份,硫化剂DTDM用量为0.6~0.8份时,NR硫化胶具有较好的物理性能和耐磨性能。利用正交试验法,确定硫黄、促进剂NS和硫化剂DTDM及其交互作用对NR胶料耐磨性能的影响,并通过直观分析和方差分析确定NR胶料DIN磨耗量最小的半有效硫化体系的配方为:硫黄1.8,硫化剂DTDM 0.8,促进剂NS1.4。 相似文献
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研究了活化剂Struktol A-73在天然橡胶及天然橡胶与丁苯橡胶并用胶中的应用特性,结果表明:胶料中加入Struktol A-73可改善胶料的抗硫化返原性和热稳定性;提高胶料的硫化效率;改进胶料的动态性能;降低胶料的生热和压缩永久变形;与噻唑类硫化促进体系并用,无亚硝胺污染环境的危险;对钢丝粘合性能造成的影响,在胶料老化之后即可降至最小;混炼工艺性能良好。它是一种特别有效的硫化活化剂,一般用量 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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D. G. Gordeev L. F. Gudarenko M. V. Zhernokletov V. G. Kudel’kin M. A. Mochalov 《Combustion, Explosion, and Shock Waves》2008,44(2):177-189
A semi-empirical equation of state for metals is described. Its capabilities are demonstrated by the example of the equation
of state for aluminum. New experimental data are presented on the location of the isentrope of aluminum for unloading from
the state at p = 229.71 GPa on the shock adiabat to an aerogel (SiO2) of density 0.08 g/cm3.
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Translated from Fizika Goreniya i Vzryva, Vol. 44, No. 2, pp. 61–75, March–April, 2008. 相似文献
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Jorge Marcelo Romero Soledad Bustillo Hugo Enrique Ramirez Maisuls Nelly Lidia Jorge Manuel Eduardo Gómez Vara Eduardo Alberto Castro Alicia H. Jubert 《International journal of molecular sciences》2007,8(7):688-694
A thermochemical rather simple experimental technique is applied to determine the enthalpy of formation of Diperoxide of ciclohexanone. The study is complemented with suitable theoretical calculations at the semiempirical and ab initio levels. A particular satisfactory agreement between both ways is found for the ab initio calculation at the 6–311G basis This set level. Some possible extensions of the present procedure are pointed out. 相似文献
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A perturbation viscometer is a differential capillary viscometer that measures the logarithmic viscosity gradient of the viscosity-composition curve for gas mixtures. Measurements are made at different gas mixture compositions. Integration of the logarithmic viscosity gradients measured over the full composition range gives the mixture viscosity relative to the viscosity of one of the pure components of the gas mixture. This method is attractive because, for measurements of equal precision, integration of the gradients is potentially an order of magnitude more precise than measurement of the viscosities directly. It can also work at high and low temperatures and perhaps high pressures.The perturbation viscometer has been used to make measurements on ideal gas mixtures at ambient and elevated temperatures. The situation is more complicated when the gas mixtures are non-ideal. Extra effects due to density differences, molar volume change on mixing and differential thermal expansion may be measured in addition to the desired viscosity change producing systematic errors in the results. Thus, a more sophisticated apparatus is required. The standard perturbation viscometer has been modified to separate out the extra effects to permit measurement of the true change in viscosity. In addition, the theoretical operation of the modified apparatus has been revised to account for the design changes to permit calculation of the viscosity-composition profiles from the results.The apparatus has been tested using helium-HFC-125 mixtures and two new viscosity-composition profiles are presented for these mixtures at 23 and . Internal consistency tests have been used to confirm that the data produced are of high quality with an estimated uncertainty in the viscosity ratio data at of 0.9% and at of 1.5%. 相似文献
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塔设备改造选型的分析 总被引:2,自引:0,他引:2
就当前扩产增容中塔设备设计和改造时板式塔和填料塔的选型问题加以分析。在评述目前国内常用的几种塔板和新型填料之后,着重介绍一种新型塔板(导向梯形浮阀塔板)和一种新型填料(波环填料——乾隆帕克)。 相似文献