共查询到20条相似文献,搜索用时 93 毫秒
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研究蓝晶石尾矿粒径、用量及改性对天然橡胶(NR)胶料性能的影响。结果表明,当未改性蓝晶石尾矿粒径[D90(累计分布达到90%的粒径)]为2. 75 μm和用量为50份时,NR硫化胶的综合物理性能最佳;各改性剂(硬脂酸、铝酸
酯、棕榈酸和偶联剂KH-550)改性蓝晶石尾矿(粒径为2. 75 μm)的NR胶料的FL和Fmax增大,其中偶联剂KH-550改性蓝晶石尾矿的NR胶料的t10和t90缩短,NR硫化胶的300%定伸应力、拉伸强度和撕裂强度最大,分别为9. 8 MPa,24. 3 MPa和42 kN·m-1;偶联剂KH-550改性蓝晶石尾矿与NR的粘结较好,其NR硫化胶的撕裂断面较为粗糙、致密。 相似文献
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采用研磨和偶联剂乙烯基三乙氧基硅烷(VTEO)对热解炭黑(CBp)进行改性处理,研究研磨改性CBp和VTEO改性CBp补强对丁苯橡胶(SBR)胶料性能的影响。结果表明:随着研磨时间的延长,CBp粒径减小,与橡胶大分子链的相互作用增强,研磨改性CBp补强SBR胶料的门尼粘度和Fmax-FL增大,硫化胶的物理性能提高;VTEO改性使CBp补强SBR胶料的t10延长,加工安全性提高,当采用1份VTEO改性50份CBp时,硫化胶的拉伸强度提高1.6 MPa。 相似文献
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采用4种改性方法,研究偶联剂KH-550改性煅烧高岭土对NBR胶料性能的影响。结果表明,改性煅烧高岭土填充NBR胶料的ML和MH增大,焦烧时间缩短,溶液法和球磨法改性的煅烧高岭土对胶料的硫化有延迟作用;改性煅烧高岭土填充NBR硫化胶的300%定伸应力、拉伸强度和撕裂强度均明显提高;经热空气老化后定伸应力和拉伸强度提高,拉断伸长率下降;耐3#标准油的性能有所提高,其中以球磨法改性煅烧高岭土的补强效果最好。扫描电镜分析表明,偶联剂KH-550能显著改善NBR与高岭土之间的界面作用。 相似文献
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研究改性白炭黑和硅酮粉对丁苯橡胶(SBR)性能的影响.结果表明:在填料用量相同的情况下,随着硅酮粉用量的增大,胶料的ML和MH呈减小趋势,硫化胶的物理性能下降,弹性和耐磨性提高;与未改性填料填充SBR硫化胶相比,硅烷偶联剂KH-550或M-CNSL改性填料填充SBR硫化胶的定伸应力、拉伸强度和拉断伸长率增大,撕裂强度变化不大,弹性和耐磨性提高,其中M-CNSL的改性效果更明显;扫描电子显微镜分析证明,改性白炭黑和硅酮粉在SBR硫化胶中的分散性提高. 相似文献
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采用溶胶沉淀法制备了纳米CaCO3/SiO2复合粒子,并用不同改性剂对其进行表面改性,考察了改性复合粒子对丁苯橡胶(SBR)物理机械性能的影响,同时与硬脂酸钠改性纳米CaCO3填充的SBR硫化胶做了比较。结果表明,CaCO3/SiO2复合粒子粒径为40~50 nm,大小均匀,表面粗糙,SiO2包覆在纳米CaCO3表面,具有核壳结构;硬脂酸钠改性复合粒子填充SBR硫化胶的拉伸强度、撕裂强度、永久变形和邵尔A硬度均大于改性纳米CaCO3填充SBR硫化胶,最大拉伸强度可达到13.6 MPa,两者的300%定伸应力和扯断伸长率相当;用硬脂酸钠和Si 69协同改性的纳米CaCO3/SiO2填充SBR硫化胶的拉伸强度、300%定伸应力、撕裂强度和邵尔A硬度均明显优于硬脂酸钠改性复合粒子填充的SBR硫化胶,最大拉伸强度达到14.1 MPa,扯断伸长率减小,低填充量时两者的永久变形差别不大,高填充量时前者的永久变形低于后者。 相似文献
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分散剂和偶联剂对白炭黑填充硅橡胶性能的影响 总被引:4,自引:2,他引:2
研究锌皂分散剂、偶联剂KH-560及其并用对白炭黑填充硅橡胶性能的影响。结果表明,锌皂分散剂和偶联剂KH-560均能弱化填料网络结构,促进白炭黑的分散,减小胶料在低应变下的储能模量,且二者并用效果更佳;结合胶质量分数增大表明偶联剂KH-560和锌皂分散剂并用能够提高填料与硅橡胶间的相互作用;锌皂分散剂的加入明显缩短了胶料的正硫化时间,在保证操作安全的前提下,显著加快了硫化速率;偶联剂KH-560改性白炭黑体系中加入少量的分散剂,硫化胶的硬度、100%和300%定伸应力、拉伸强度呈增大趋势,拉断伸长率减小。 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