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镁铝水滑石及其复合体系对PVC热稳定性能的调控 总被引:9,自引:0,他引:9
采用比色法、热失重法等研究了不同镁铝摩尔比的水滑石(LDHs)对PVC糊热稳定性能的影响。结果表明,在镁铝比分别为2、3、4的样品中,镁铝比为2的LDHs对PVC的热稳定效果最佳;将其与传统的铅盐、有机锡稳定剂复配,均具有良好的协同效应,可以实现对PVC糊热稳定性能的控制。其中,PVC/Mg-AlLDHs/Sn以100∶1.5∶1.5(质量份数,下同)比例复合后的体系,不仅热稳定性能优于传统的的铅盐体系,而且具有较低的糊黏度及较好加工流变性能。 相似文献
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采用比色法、热失重法等研究了不同镁铝摩尔比的水滑石(LDHs)对PVC糊热稳定性能的影响。结果表明。在镁铝比分别为2、3、4的样品中,镁铝比为2的LDHs对PVC的热稳定效果最佳;将其与传统的铅盐、有机锡稳定剂复配,均具有良好的协同效应。可以实现对PVC糊热稳定性能的控制。其中,PVC/Mg-Al LDHs/Sn以100:1.5:1.5(质量份数,下同)比例复合后的体系,不仅热稳定性能优于传统的铅盐体系,而且具有较低的糊黏度及较好加工流变性能。 相似文献
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合成了肉豆蔻酸镧、肉豆蔻酸铈、肉豆蔻酸钕三种稀土热稳定剂,采用刚果红法分别测试了其与硬脂酸锌、季戊四醇、硬脂酸钙之间的协同作用,复配得到了硬质PVC用新型肉豆蔻酸稀土复合热稳定剂。利用转矩流变仪、动态力学谱仪等考察其对PVC流变性能和力学性能的影响。研究结果表明:肉豆蔻酸稀土复合热稳定剂具有良好的热稳定性,静态和动态热稳定时间约为120min和60min,能较好地抑制PVC的初期着色性;复合稀土体系的加工流变性能优于铅盐体系;拉伸强度、断裂伸长率和断裂强度与铅盐体系相当,而冲击强度高于铅盐体系。 相似文献
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《无机盐工业》2017,(1)
采用共沉淀-离心-水热法制备出形貌规整且高结晶度的锌镁铝水滑石(ZnMgAl-CO_3LDHs),以此为前驱体通过离子交换反应制备出磷酸二氢根插层锌镁铝水滑石(ZnMgAl-P LDHs),利用XRD、FT-IR、SEM、TG/DTG分析表明磷酸二氢根成功插入到锌镁铝水滑石层间,层间距从0.763 5 nm增加到1.226 0 nm。将磷酸二氢根插层锌镁铝水滑石与聚氯乙烯(PVC)复配,研究其对聚氯乙烯的热稳定性、力学性能及流变性能的影响,研究发现磷酸二氢根插层锌镁铝水滑石能够明显提高PVC的初期抑制变色性能,但是长期热稳定性略有降低;磷酸二氢根插层改性锌镁铝水滑石后提高了在聚氯乙烯基材中的分散性并改善了与聚氯乙烯之间的相容性,聚氯乙烯力学性能提高,但是加工流变性能稍有降低。 相似文献
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采用共沉淀法制备了硬脂酸柱撑镁铝镧三元类水滑石,采用X射线衍射(XRD)分析、红外光谱(FT-IR)分析及热重分析(TGA)对其进行表征.利用刚果红法、转矩流变仪研究了其对PVC热稳定性能的影响及与其他热稳定助剂的协同效果,并通过紫外光谱初步分析了热稳定机理.结果表明,硬脂酸柱撑镁铝镧类水滑石的长期热稳定性较好,与季戊四醇存在明显的协同效应.当上述两者等质量比复配后可使PVC静态稳定时间达到73 min,动态热稳定时间达到2411 s,扭矩适中,能够提高PVC的热稳定性能和加工性能. 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