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以甲基乙烯基聚硅氧烷为基料、含氢硅油为交联剂、硅烷偶联剂为填料改性剂、改性硅微粉为导热和补强填料制得加成型有机硅灌封胶。研究了硅烷偶联剂种类、改性硅微粉粒径和用量对有机硅灌封胶性能的影响。结果表明,随着改性硅微粉平均粒径由1μm增大到20μm,有机硅灌封胶的黏度由7 712 mPa·s降至1 520 mPa·s,热导率由0.64 W/(m·K)升至0.73 W/(m·K),拉伸强度由1.70 MPa降至1.60 MPa,拉断伸长率由100%降至45%,沉降物平均质量由8 g增加到61 g;随着改性硅微粉用量从0增加到300份,有机硅灌封胶的黏度从200 mPa·s升至2 501 mPa·s,热导率从0.20 W/(m·K)升至1.05 W/(m·K),拉伸强度升高并趋于稳定,拉断伸长率先升后降;综合考虑,采用γ-氨丙基三乙氧基硅烷作填料改性剂、200份平均粒径10μm的改性硅微粉作导热和补强填料较佳,此时有机硅灌封胶的拉伸强度为1.65 MPa,拉断伸长率为75%,黏度为2 010 mPa·s,热导率为0.65 W/(m·K),沉降物平均质量为35 g。 相似文献
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以环氧大豆油丙烯酸酯作为成膜树脂,添加中空玻璃微珠作为隔热填料,制得一种紫外光固化薄层保温隔热涂料。研究了中空玻璃微珠的用量对涂层机械性能、漫反射率、导热率和保温隔热性能的影响,确定了涂料配方中空玻璃微珠的添加量为8%。比较了不同厚度涂层的热反射率和隔热保温性能。当涂层厚度为200μm时,所制备的隔热保温涂层的漫反射率达75%,导热率为0.069W/(m·K),放置30min后的水温与空白试样的水温温差为26℃,隔热温差达27℃,涂膜附着力为1级,铅笔硬度可达4H,冲击强度大于50kg·cm。 相似文献
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介绍了近年国外塑料用传统无机填料和母料新产品性能、特点及其应用,包括超细滑石、亚微米级滑石、碳酸钙母料、中空玻璃微球、片状玻纤粉等新型填料。填料微型化、超细化是无机填料技术发展方向。 相似文献
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以甲基苯基硅树脂为基体,添加石英粉等功能填料制备了硅树脂涂层,采用激光脉冲法、氧乙炔烧蚀法和扫描电子显微镜(SEM)等对涂层的热性能和烧蚀性能进行分析。结果表明,硅树脂涂层的热导率0.272 W/m·K,热扩散系数0.154 mm~2/s,比热容1.155 J/g·K,质量残留率72.6%,线烧蚀率0.247 mm/s,质量烧蚀率0.0715 g/s;在1~1.5 mm厚该涂层防护下,经风速9马赫36 s风洞试验后,涂层背面温度由1 600℃降至100℃以下,质量烧蚀率仅为1.08×10~(-3)~1.61×10~(-3)g/cm~2·s,表面平整。该涂层防、隔热性能优异,耐烧蚀抗冲刷性能良好。 相似文献
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选取硼酸高温脱水后的混合物作为填料,与高岭土、滑石粉、铝粉等填料制备了以有机硅树脂为基料,可以耐受800℃的耐高温防护涂层并测试了涂层的各项性能。为研究硼酸混合物在涂层高温灼烧过程中的作用机理,对涂层在经200℃固化、500℃高温灼烧和700℃高温灼烧后的表层形貌、元素和涂层物质变化情况进行分析。阐明了涂层中有机硅树脂上的有机基团会在500℃时大量分解。硼酸混合物在高温下,会以熔融态填充有机硅树脂分解挥发产生的空隙,并粘接其他颜填料,但是涂层表面会有硼酸混合物脱水造成的少量凹陷存在。 相似文献
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采用水热法制备ZrO2空心微球作为隔热填料,以萘改性的耐热酚醛环氧树脂为基体,制备了4种不同ZrO2含量的热电池隔热涂层,表征了其性能. 结果表明,所制ZrO2为直径约500 nm的空心球,表面粗糙;酚醛环氧树脂的热分解温度约为370℃,适宜的ZrO2空心球添加量为50%~60%(w). ZrO2含量为50%(w)时,室温下隔热涂层结合强度为21.6 MPa,剪切强度为11.4 MPa,热导率为0.05 W/(m×K);300℃下隔热涂层剪切强度为3.1 MPa,热导率为0.04 W/(m×K). 相似文献
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液体硅橡胶/中空玻璃微珠隔热材料的制备及性能研究 总被引:1,自引:0,他引:1
王慧利;邓建国;舒远杰;纪兰香 《中国塑料》2011,26(12):67-70
以液体硅橡胶(LSR)为基材,中空玻璃微珠为填料,通过共混法制备了隔热材料,探讨了不同含量、不同粒径中空玻璃微珠对材料热导率、力学性能及微观形态的影响。结果表明, 材料的热导率随中空玻璃微珠用量的增加呈先下降后上升趋势,且填充同样含量的中空玻璃微珠,粒径越小,材料的热导率降低幅度越大;加15份平均粒径为40μm的中空玻璃微珠,材料的热导率最低为0.0135 W/m·K;材料的拉伸强度及断裂伸长率随着中空玻璃微珠用量的增加而降低,粒径越小,其拉伸强度和断裂伸长率降幅越大;中空玻璃微珠的粒径越小,其在LSR基材中的分散性越好。 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