共查询到20条相似文献,搜索用时 171 毫秒
1.
2.
硫化促进剂O,O''''-二辛基二硫代磷酸镨在天然橡胶中的应用 总被引:1,自引:1,他引:0
将自制不含氮元素、硫化过程中不会产生亚硝胺的O,O’-二辛基二硫代磷酸镨(PrDTP-8)用作天然橡胶(NR)的硫化促进剂。结果表明,PrDTP-8对NR具有明显的硫化促进效果;PrDTP-8用量为3.36份,硫化胶的力学性能最佳,即硬度、拉伸强度、撕裂强度、100%定伸应力和300N定伸应力均最大,而拉断伸长率最小。硫化动力学研究表明,含PrDTP-8的混炼胶硫化反应活化能E和频率因子A分别为87.15kJ/mol和2.33E+10。 相似文献
3.
4.
LaDBDP稀土配合物用量对天然橡胶性能的影响 总被引:1,自引:0,他引:1
将O,O'-二丁基二硫代磷酸镧(LaDBDP)用作天然橡胶(NR)的硫化促进剂.研究了LaDBDP用量对NR硫化特性、力学性能和热空气老化性能的影响,并与相应的非稀土配合物NaDBDP和ZnDBDP做了对比.结果表明,LaDBDP,NaDBDP和ZnDBDP用量对NR各项性能的影响规律基本相同.随着LaDBDP用量由1mmol增至4mmol,NR硫化速度显著加快,硫化胶力学性能提高,但对NR热空气老化性能的影响不明显.当LaDBDP用量由4mmol增至6mmol时,对NR硫化特性和力学性能的影响不明显,但热老化性能有所下降.当LaDBDP用量为4mmol时,NR综合性能最佳. 相似文献
5.
研究二烷基二硫代磷酸锌/白炭黑(莱茵克ZDT/S)与偶联剂si69并用对NR胶料性能的影响.结果表明,NR中加入莱茵克ZDT/S,延长了胶科的焦烧时间(ts1)和正硫化时间(t90),随着莱茵克ZDT/S用量的增大,ts1和t90明显延长.与偶联剂Si69并用后,NR胶料的抗硫化返原性提高,正硫化条件下,当莱茵克ZDT/S用量为1份时,NR硫化胶的拉伸强度、拉断仲长率和撕裂强度较大;过硫化条件下,莱茵克ZDT/S使胶料的撕裂强度保持率增大.差示扫描量热仪分析结果表明.莱茵克ZDT/S的加人提高了硫化体系的分解温度. 相似文献
6.
7.
研究了添加不同载体化合物二辛基多硫代磷酸酯(SDT/S)、二丁基二硫代磷酸锌(TP/S)、二硫代己内酰胺(S/G)、二硫代二码啡啉(M/G)以及SDT/S的用量对轮胎用NR胶料的加工性能、硫化特性、拉伸性能、动态生热和压缩永久变形等性能的影响规律,并与传统硫黄硫化体系进行了比较。结果表明,加入SDT/S和TP/S会缩短门尼焦烧时间,但能提高硫化平坦模量和改善抗硫化返原能力;较低硫化温度(145℃下),传统硫化体系赋予NR硫化胶较低的拉伸强度和300%定伸应力,提高硫化温度(175℃),会使加入硫载体的NR硫化胶具有较高的拉伸性能保持率;加入SDT/S和提高其用量,可提高NR胶料的抗硫化返原性能,降低硫化胶的动态生热和改善压缩永久变形性能。 相似文献
8.
反应性防老剂MC与防老剂4020的对比研究 总被引:2,自引:0,他引:2
研究了反应性防老剂N-(4-苯胺基苯基)马来酰亚胺(MC)对丁腈橡胶(NBR)的硫化特性、力学性能以及耐热空气.ASTMl#油、ASTM3#油、湿热和臭氧老化性能的影响.并与防老剂4020进行对比。结果表明,采用硫黄硫化体系时,防老剂MC使胶料的硫化速度和硫化程度有所降低;采用过氧化物硫化体系时,含防老剂MC胶料的硫化速度、硫化程度和力学性能明显高于含防老剂4020的胶料。防老剂MC使NBR硫化胶具有良好的耐AS-TM3#油老化性能.但抗臭氧老化作用则差于防老剂4020。 相似文献
9.
烷基硫代磷酸锌硫化促进剂对天然橡胶老化性能影响研究 总被引:1,自引:0,他引:1
研究了烷基硫代磷酸锌和其他常用硫化促进剂对天然橡胶硫化胶的老化性能的影响.实验表明二异丙基二硫代磷酸锌能赋予天然橡胶硫化胶优良的耐热空气老化性能. 相似文献
10.
将自制的维生素C镧配合物(VCLa)作为新型防老剂用于天然橡胶(NR)中,考察VCLa对胶料性能的影响。结果表明:VCLa对NR具有一定的硫化促进作用,显著缩短胶料的t90,略微提高硫化胶拉伸性能;VCLa对NR具有优良的防护作用,其防臭氧老化效果显著优于常用防老剂4010NA,RD和MB,防热氧老化效果与防老剂4010NA和RD相当,优于防老剂MB,防紫外光老化效果接近于防老剂4010NA和RD,但优于防老剂MB;VCLa减缓NR应力老化,提高硫化胶的耐磨性和耐屈挠疲劳性能。 相似文献
11.
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
12.
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.
__________
Translated from Fizika Goreniya i Vzryva, Vol. 44, No. 2, pp. 61–75, March–April, 2008. 相似文献
13.
15.
16.
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
17.
18.
19.
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
20.
醋酸纤维素取代基分布与性质的关系 总被引:9,自引:0,他引:9
分析了以吡啶为溶剂的醋酸纤维素的13C-NMR核磁共振谱,得出了三种不同位置羟基的取代度。结合X—射线和DSC分析,初步说明具有相同取代度但未经水解和经过水解的醋酸纤维素(CA) 性质上的差异是由于三个羟基上的取代度分布不同及消晶程度差异所致。 相似文献