液相法剥离二硫化钼及其对橡胶耐磨性能的影响
发布时间：2018-11-13 07:28
【摘要】：二硫化钼(MoS2)具有特殊的层状结构,当受到外力时,层与层之间弱的范德华力很容易断裂而产生滑移,所以具有很低的摩擦系数,是一种优良的润滑剂。与普通MoS2相比,纳米MoS2具有更低的摩擦系数,减摩抗磨效果更好,由于具有纳米尺寸效应,与聚合物基体的界面结合作用也明显增强,是一种很有潜力的橡胶抗磨添加剂。第一部分：探究三种仪器(超声清洗器、超声细胞粉碎机和高速球磨机)液相剥离MoS：的最佳条件,通过扫描电子显微镜(SEM)和透射电子显微镜(TEM))对MoS2的表面形貌以及片层厚度进行表征。结果表明,三种仪器均能将微米MoS2剥离成片层较薄且部分成纳米尺度的纳米MoS2。超声清洗器、超声细胞粉碎机、高速球磨机最佳液相剥离MoS2的条件分别为：超声1h、超声8次、球磨1h。第二部分：制备MoS2/炭黑/丁腈橡胶复合材料和MoS2/炭黑/天然橡胶复合材料,研究MoS：的含量变化对复合材料性能的影响。在MoS2/炭黑/NBR复合材料中MoS2仍然保持着原有的层状结构,未经剥离的普通MoS2会降低复合材料的耐磨性能,而经过剥离的MoS2可以有效提高复合材料的耐磨性能。在MoS2/炭黑/NR复合材料中,随MoS2含量的增加,复合材料性能的变化没有规律可循,这可能与天然橡胶的结构有关。第三部分：利用乳液-共絮凝的方法,制备了MoS2/丁苯橡胶和MoS2/炭黑/丁苯橡胶纳米复合材料,研究不同MoS2含量对橡胶复合材料各项性能尤其是对耐磨性能的影响。结果表明,在两种体系中,随着MoS2含量的增加,复合材料的力学性能以及耐磨性能均有所提高,且MoS2/SBR复合材料性能提高的幅度要比MoS2/炭黑/SBR复合材料的大。第四部分：研究不同MoS2填充份数对MoS2/白炭黑/丁苯橡胶复合材料性能的影响。在白炭黑填充体系中,随着MoS2含量的增加,复合材料的力学性能有小幅度增加,而耐磨性能提高较为显著,填充10phr MOS2的复合材料的阿克隆体积磨耗量比纯白炭黑填充的复合材料降低了46%。第五部分：制备MoS2-丁吡橡胶/丁苯橡胶复合材料,在乳液-共絮凝过程中,用等量(10phr)的丁吡橡胶替代丁苯橡胶,以MoS2填充量为变量,研究丁苯橡胶复合材料各项性能与MoS：含量变化的关系。结果表明随着MoS：的增加,复合材料的力学性能有较大提高,且相同MoS2填充量的MoS2-VPR/SBR复合材料的力学性能以及耐磨性能,要比未用丁吡橡胶替代的MoS2/SBR复合材料提高很多。这是因为丁吡橡胶在体系中充当MoS2与丁苯橡胶的桥梁,可以增强MoS2与丁苯橡胶基体之间的界面结合作用,继而提高丁苯橡胶复合材料的力学性能以及耐磨性能。当MoS2填充份数为2phr时,复合材料的耐磨性能最好,阿克隆体积磨耗量为0.23cm3/1.61km。
[Abstract]:Molybdenum disulfide (MoS2) has a special layered structure. When it is subjected to external force, the weak van der Waals force between the layers is easy to break and slip, so it has a very low friction coefficient and is an excellent lubricant. Compared with ordinary MoS2, nano MoS2 has lower friction coefficient and better antiwear effect. Because of nanometer size effect, the interfacial bonding with polymer matrix is obviously enhanced, which is a potential rubber antiwear additive. Part one: explore the optimal conditions for liquid phase stripping of MoS: from three kinds of instruments (ultrasonic cleaner, ultrasonic cell pulverizer and high speed ball mill). The surface morphology and lamellar thickness of MoS2 were characterized by scanning electron microscopy (SEM) and transmission electron microscope (TEM). The results show that all of the three instruments can peel micron MoS2 into thin and partially nanoscale MoS2.. The optimal liquid phase MoS2 stripping conditions of ultrasonic cleaner, ultrasonic cell pulverizer and high speed ball mill were as follows: ultrasound 1 h, ultrasonic 8 times, ball mill 1 h. In the second part, MoS2/ carbon black / nitrile rubber composites and MoS2/ carbon black / natural rubber composites were prepared. The effect of the content of MoS: on the properties of the composites was studied. In the MoS2/ carbon black / NBR composites, MoS2 still maintains the original layered structure. The unpeeled ordinary MoS2 can reduce the wear resistance of the composites, while the exfoliated MoS2 can effectively improve the wear resistance of the composites. In MoS2/ carbon black / NR composites, with the increase of MoS2 content, the properties of the composites have no regular change, which may be related to the structure of natural rubber. The third part: the MoS2/ SBR and MoS2/ carbon black / SBR nanocomposites were prepared by the emulsion-co-flocculation method. The effects of different MoS2 content on the properties of the rubber composites, especially on the wear resistance were studied. The results show that the mechanical properties and wear resistance of the composites are improved with the increase of MoS2 content in the two systems, and the improvement range of the properties of the MoS2/SBR composites is larger than that of the MoS2/ carbon black / SBR composites. Part four: the effect of different MoS2 content on the properties of MoS2/ silica / SBR composites was studied. In the silica filled system, with the increase of MoS2 content, the mechanical properties of the composites increased slightly, while the wear resistance of the composites increased significantly. The Akron volume attrition of the composites filled with 10phr MOS2 was 46% lower than that of the composites filled with pure silica. The fifth part: MoS2- butadiene rubber / styrene-butadiene rubber composite was prepared. In the process of emulsion-co-flocculation, butadiene rubber was replaced by equal amount of butadiene rubber (10phr), and the filling amount of MoS2 was taken as the variable. The relationship between the properties of styrene-butadiene rubber composites and the content of MoS: was studied. The results show that with the increase of MoS:, the mechanical properties and wear resistance of MoS2-VPR/SBR composites with the same content of MoS2 are improved. It is much higher than the MoS2/SBR composite instead of butadiene rubber. This is because butadiene rubber acts as a bridge between MoS2 and styrene-butadiene rubber in the system, which can enhance the interfacial bonding between MoS2 and SBR matrix, and then improve the mechanical properties and wear resistance of SBR composites. When the content of MoS2 is 2phr, the wear resistance of the composite is the best, and the volume attrition of Akron is 0.23 cm ~ 3 / 1.61km.
【学位授予单位】：北京化工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB332
本文编号：2328418
[Abstract]:Molybdenum disulfide (MoS2) has a special layered structure. When it is subjected to external force, the weak van der Waals force between the layers is easy to break and slip, so it has a very low friction coefficient and is an excellent lubricant. Compared with ordinary MoS2, nano MoS2 has lower friction coefficient and better antiwear effect. Because of nanometer size effect, the interfacial bonding with polymer matrix is obviously enhanced, which is a potential rubber antiwear additive. Part one: explore the optimal conditions for liquid phase stripping of MoS: from three kinds of instruments (ultrasonic cleaner, ultrasonic cell pulverizer and high speed ball mill). The surface morphology and lamellar thickness of MoS2 were characterized by scanning electron microscopy (SEM) and transmission electron microscope (TEM). The results show that all of the three instruments can peel micron MoS2 into thin and partially nanoscale MoS2.. The optimal liquid phase MoS2 stripping conditions of ultrasonic cleaner, ultrasonic cell pulverizer and high speed ball mill were as follows: ultrasound 1 h, ultrasonic 8 times, ball mill 1 h. In the second part, MoS2/ carbon black / nitrile rubber composites and MoS2/ carbon black / natural rubber composites were prepared. The effect of the content of MoS: on the properties of the composites was studied. In the MoS2/ carbon black / NBR composites, MoS2 still maintains the original layered structure. The unpeeled ordinary MoS2 can reduce the wear resistance of the composites, while the exfoliated MoS2 can effectively improve the wear resistance of the composites. In MoS2/ carbon black / NR composites, with the increase of MoS2 content, the properties of the composites have no regular change, which may be related to the structure of natural rubber. The third part: the MoS2/ SBR and MoS2/ carbon black / SBR nanocomposites were prepared by the emulsion-co-flocculation method. The effects of different MoS2 content on the properties of the rubber composites, especially on the wear resistance were studied. The results show that the mechanical properties and wear resistance of the composites are improved with the increase of MoS2 content in the two systems, and the improvement range of the properties of the MoS2/SBR composites is larger than that of the MoS2/ carbon black / SBR composites. Part four: the effect of different MoS2 content on the properties of MoS2/ silica / SBR composites was studied. In the silica filled system, with the increase of MoS2 content, the mechanical properties of the composites increased slightly, while the wear resistance of the composites increased significantly. The Akron volume attrition of the composites filled with 10phr MOS2 was 46% lower than that of the composites filled with pure silica. The fifth part: MoS2- butadiene rubber / styrene-butadiene rubber composite was prepared. In the process of emulsion-co-flocculation, butadiene rubber was replaced by equal amount of butadiene rubber (10phr), and the filling amount of MoS2 was taken as the variable. The relationship between the properties of styrene-butadiene rubber composites and the content of MoS: was studied. The results show that with the increase of MoS:, the mechanical properties and wear resistance of MoS2-VPR/SBR composites with the same content of MoS2 are improved. It is much higher than the MoS2/SBR composite instead of butadiene rubber. This is because butadiene rubber acts as a bridge between MoS2 and styrene-butadiene rubber in the system, which can enhance the interfacial bonding between MoS2 and SBR matrix, and then improve the mechanical properties and wear resistance of SBR composites. When the content of MoS2 is 2phr, the wear resistance of the composite is the best, and the volume attrition of Akron is 0.23 cm ~ 3 / 1.61km.
【学位授予单位】：北京化工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB332
【引证文献】
相关会议论文 前1条
1 刘敏;胡坤宏;田明;胡献国;;单层MoS_2重堆积产物的摩擦学特性研究[A];2006全国摩擦学学术会议论文集（一）[C];2006年
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