共查询到20条相似文献,搜索用时 62 毫秒
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徐国军 《石油石化物资采购》2022,(1):40-42
聚氨酯弹性体一般以低聚物多元醇和对异氰酸酯以及扩链/交联剂以及少量助剂为原料而制成,是介于橡胶与塑料间的一种物质,拥有较好的强度以及弹性,还有更强的硬度以及耐磨性的优点.但是在实际的应用过程中,却存在诸多聚氨酯弹性体处于实验室的阶段,难以为国家的发展提供助力.本文以有机硅改性聚氨酯弹性体为例,分析聚氨酯和聚氨酯弹性体的... 相似文献
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《精细石油化工进展》2005,6(5):54-54
拜耳材料科学公司开发的聚氨酯硬泡新材料,可长期曝置于高于150℃的环境下。这类保温材料可长时间置于不良环境如管道输送蒸汽的情况下,不会发脆而损坏和变形,如再冷却至极低温度如液态气体情况下,也不会发生脆裂危险。 相似文献
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为提高军用聚氨酯硬质泡沫迷彩伪装材料的阻燃性能.对各种阻燃剂进行了筛选并进行正交复配试验,确定了复配阻燃剂的最佳配方。考察了复配阻燃剂对材料阻燃性能和伪装性能的影响。在不影响材料伪装性能的基础上,制得了氧指数在34以上的高阻燃性聚氨酯硬质泡沫。 相似文献
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桥面铺装技术及沥青铺装材料的现状与发展 总被引:4,自引:0,他引:4
大跨径桥梁的面层铺装技术是目前国内外道路工程领域研究的热点和难点。由于受到多种因素的影响,桥面铺装对沥青粘结材料的性能要求也高于一般的高等级公路。概述了浇注式沥青混凝土、沥青玛蹄脂碎石、环氧沥青混凝土三种常见的桥面铺装技术的发展概况, 以及适合不同铺装技术的硬质沥青、聚合物改性沥青、环氧沥青三种粘结材料的性能和技术要求。 相似文献
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聚氨酯微孔材料在石油化学工业中的应用 总被引:4,自引:0,他引:4
聚氨酯微孔材料在石油化学工业中的应用FuRongxing(JiangsuInstituteofPetrochemicalTechnology,InstituteofDesignResearch.Changzhou213016)付荣兴(江苏石油化工学院... 相似文献
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在高温下,钢桥面上下铺装层间的黏结层受到汽车荷载水平和垂直应力的作用而极易发生破坏而失效。采用直接剪切试验和拉拔试验对两种不同黏结层材料的性能进行了研究,并分析了影响黏结剂黏结效果的因素。 相似文献
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根据水下在线管汇(ILM)中需进行聚氨酯填充的填充结构特点,及填充后形成的聚氨酯弹性体在质量和性能上的要求,研究分析液态弹性体CPU材料的特点及浇注施工要求,模拟实际施工条件、浇注对象结构特征和尺寸,制定出浇注试验方案,设计制造出浇注试验模具。选用合适的浇注机和液态聚氨酯弹性体原料,实施了浇注试验,试验结果证明浇注质量满足项目要求。根据浇注试验手段和方法,制定出了合理的现场浇注工艺,在项目施工时成功地一次性将聚氨酯弹性体浇满水下在线管汇的目的区域。 相似文献
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L. O. Oyekunle 《Petroleum Science and Technology》2013,31(11):1401-1414
Abstract The simplest general compositional model considers asphalt to be made up of asphaltenes, heavy oils, and resins. In the present study the extent of similarity between the properties and composition of various types of asphalt obtained from different sources has been carefully explored. It shows how ductility, penetration, and softening point are related to the chemical nature of paving asphalts in the range 41–58 softening points. Asphalt properties are found to be a direct function of its chemical constituents. The relationship between softening point and asphaltene content was found to be linear while asphalts of the same softening point are easily distinguished by the content of the resins. Evaluation of the two asphalt indices—the asphaltene index (I A ) and the Gaestel index (I C ), reveals that they both vary linearly with the composition of asphaltenes and resins thus confirming their suitability in the characterization of asphalts. Comparison of the two indices shows that IC is more suitable in estimating the colloidal stability of different groups of asphalts. The observed correlations can be found useful in the areas of asphalt blending and rejuvenating through the appropriate selection of asphalt components. 相似文献
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《Petroleum Science and Technology》2007,25(11):1401-1414
The simplest general compositional model considers asphalt to be made up of asphaltenes, heavy oils, and resins. In the present study the extent of similarity between the properties and composition of various types of asphalt obtained from different sources has been carefully explored. It shows how ductility, penetration, and softening point are related to the chemical nature of paving asphalts in the range 41-58 softening points. Asphalt properties are found to be a direct function of its chemical constituents. The relationship between softening point and asphaltene content was found to be linear while asphalts of the same softening point are easily distinguished by the content of the resins. Evaluation of the two asphalt indices—the asphaltene index (IA) and the Gaestel index (IC), reveals that they both vary linearly with the composition of asphaltenes and resins thus confirming their suitability in the characterization of asphalts. Comparison of the two indices shows that IC is more suitable in estimating the colloidal stability of different groups of asphalts. The observed correlations can be found useful in the areas of asphalt blending and rejuvenating through the appropriate selection of asphalt components. 相似文献
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The highly viscous crude oil from Shuguang No.1 zone of Liaohe oifield features high density,high viscosity and low wax content.It contains no gasoline fraction and its diesel oil fraction yiled is only 7.19%,which belongs to the low sulfur naphthenic stocks crude oil.Its heavy fraction is not suited for producing lubricating oil.Its heavy oil,whick contains more resins nd asphaltens and less wax,is not an ideal feedstock for catalytic cracking ,but is the ideal raw material for producing high-grade paving asphalt.Now this highy viscous crude oil is used as fuel oil after being emulsified in Liaohe oilfield,but its viscosity is so hight tha it cannot be atomized uniformly and burned completely,resuting not only in waste of oil resource but also in reduction of economical benefit.To make full use of this oil resource and alleviate the shortfall of high grade paving asphalt in China,various brands of asphal meeting Q/SHR003-1998 and ESSO specifications were developed by blending vaceuum residue of the said oil and a blending compo-net which are rich in aromatics and deficient in wax.The impct of blending component on proerties of blended ashalt has been investigated and road perfomances of these blended asphalts were studied.The labroatory test results show that the blended asphalts have good road performance and antiaging property. 相似文献
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Feng Yan 《Petroleum Science and Technology》2005,23(3):273-283
In this paper, the changes of n-pentane asphaltene content, penetration, softening point, and ductility of two Panjin paving asphalts have been studied during aging. Further, based on the change of n-pentane asphaltene content, a study on aging kinetics of asphalt has been conducted. Some correlative kinetic parameters were calculated, and the aging kinetic equation of asphalt was gained. The value calculated, depending on the equation, was in accordance with the experimental data. In addition, the relationship between the composition of the high grade paving asphalt and its aging resistant performances was revealed. It showed that the aging of high grade paving asphalt was a first order reaction. Moreover, the kinetic model was proved to be reliable by investigating the changes of penetration, softening point, and ductility of asphalt during aging. 相似文献
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Feng Yan 《Petroleum Science and Technology》2006,24(7):779-788
The changes of n-pentane asphaltene content, penetration, softening point, and ductility of two Saudi Arabian paving asphalts have been studied during aging. Further, aging kinetics of asphalt, based on the change of n-pentane asphaltene content, has been studied. Some correlative kinetic parameters were calculated and the aging kinetics equation of asphalt was gained. The value calculated depending on the equation was in accordance with the experimental data. And the relationship between the composition of the high grade paving asphalt and its aging resistant performances was revealed. It showed that the aging of high grade paving asphalt was a first-order reaction. AH-70 paving asphalt has the following characteristics: higher reaction active energy, less reaction velocity constant, lower aging velocity, and better aging resistance performance compared with AH-90 paving asphalt. The changes of penetration, softening point, and ductility of asphalt during aging further proved that the kinetic model is reliable. 相似文献
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《Petroleum Science and Technology》2013,31(7):779-788
Abstract The changes of n-pentane asphaltene content, penetration, softening point, and ductility of two Saudi Arabian paving asphalts have been studied during aging. Further, aging kinetics of asphalt, based on the change of n-pentane asphaltene content, has been studied. Some correlative kinetic parameters were calculated and the aging kinetics equation of asphalt was gained. The value calculated depending on the equation was in accordance with the experimental data. And the relationship between the composition of the high grade paving asphalt and its aging resistant performances was revealed. It showed that the aging of high grade paving asphalt was a first-order reaction. AH-70 paving asphalt has the following characteristics: higher reaction active energy, less reaction velocity constant, lower aging velocity, and better aging resistance performance compared with AH-90 paving asphalt. The changes of penetration, softening point, and ductility of asphalt during aging further proved that the kinetic model is reliable. 相似文献
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