微纤维玻璃棉浆料性能及其成纸导热性能的研究

发布时间：2018-01-04 18:08

本文关键词：微纤维玻璃棉浆料性能及其成纸导热性能的研究　出处：《陕西科技大学》2017年硕士论文　论文类型：学位论文

更多相关文章： 微纤维玻璃棉 浆料 Zeta电位 导热系数

【摘要】：雾霾天气的增多,使得人们更加关注空气质量问题,国家也出台相关政策来改善空气质量。尤其是政府推出一系列清洁能源计划,为液化天然气的发展带来了机遇,推动了LNG(液化天然气)产业的发展。隔热层使用的微纤维玻璃棉绝热材料对气罐隔热性起着关键作用。运输LNG时,需要大量的LNG气罐,这种气罐采用的隔热方式是:高真空多层绝热。本论文首先通过实验分析讨论微纤维玻璃棉浆料的性能,得出以下结论,随着疏解转数的提高,五种微纤维玻璃棉均表现出打浆度先上升,到达某一个特定的疏解转数后,打浆度略微有减小,最后会趋于稳定在某个特定的值。纤维浆料的滤水时间也会增加,当疏解转数到达一定值时,滤水时间有所降低。随着转数的增大,材料的透气度减小,疏解转数超过10000r之后,透气度会大幅度的升高,之后,透气度出现回落。随着疏解转数的增加,五种微纤维玻璃棉复合绝热材料被拉断所需要的拉力逐步提高,当对应转数到达(9000r、12000r、9000r、15000r、12000r)时,材料被拉断所需的拉力明显开始下降,随着疏解转数的进一步增加,材料被拉断所需的拉力维持不变。紧接着研究了影响浆料体系的Zeta电位的因素,同时对其相关机理进行研究,分析得出:微纤维玻璃棉浆料浓度越低,浆料体系中纤维的沉降速度越慢,相同时间内的体积沉降分数越高,纤维沉积的部分结构越疏松,浆料的分散性能越好。机械法通过减小纤维的长度从而改善微纤维玻璃棉浆料的分散性能,且随着剪切速率的增加,Zeta电位的绝对值先增大而后减小,浆料分散状态先变好而后变差。pH通过改变纤维之间的静电排斥力来影响微纤维玻璃棉浆料的分散性,随着浆料pH值的减小,浆料的分散性表现为先变好后变差的趋势,在pH=2.5时,浆料的分散性达到最佳。SHMP、PEO、HEC的使用,可以对微纤维玻璃棉浆料体系的分散性有所改善。随着添加量的增大,分散效果均呈现先变好后变差的趋势。在各自的最佳添加量下,SHMP分散效果最佳,PEO次之,HEC最差,SHMP为最佳分散剂。最后研究了低温隔热纸的相关导热性能。结果表明:测定导热系数前,需要对微纤维玻璃棉绝热复合材料进行干燥处理,最佳的干燥时间为60min,干燥温度控制在105℃。低温下,29°SR玻棉纤维制备的绝热材料导热性能最佳,39°SR玻棉纤维制备的材料导热性最小。随着温度的提高,不同打浆度的微纤维玻璃棉绝热材料的导热系数都会上升,其中29°SR和39°SR玻棉纤维绝热材料的导热系数随着温度变化不大。其他四种打浆度的玻璃棉纤维绝热材料导热性呈现明显变化,由此可以看出,39°SR玻棉理论上为最合适的绝热材料制备原料,合理的疏解转数为12000r。通过对微纤维玻璃棉绝热复合材料X-射线衍射图案的分析,可以看出微纤维玻璃棉显示出玻璃棉纤维降解较少的无定形状态,在最终材料成型当中具有一定的骨架支持能力。
[Abstract]:Increase in haze weather, makes people pay more attention to air quality problems, also to improve the quality of the air introduction of relevant policies. Especially the government launched a series of clean energy plan, has brought opportunities for the development of liquefied natural gas, to promote the LNG (liquefied natural gas) industry development. The insulation layer using micro fiber glass wool insulation the material plays a key role in tank insulation. Transport LNG, requires a lot of LNG tank, the tank insulation is adopted: high vacuum multilayer insulation. In this dissertation, through experimental analysis of micro fiber glass cotton pulp, draw the following conclusions, with the ease of speed increased, five kinds of micro fiber glass wool showed first increased beating degree, reach a certain specific ease after the revolution, the beating degree is slightly reduced, finally will be stable in a certain value. The drainage time fiber will Increase, when the ease speed reaches a certain value, the drainage time decreased. With the increase of speed, the permeability of the material decreases, then ease speed more than 10000r, the permeability increases greatly after permeability fall. With increasing ease of speed, five kinds of micro glass fiber composite insulation material is pull off the required tension gradually increased, when the corresponding rotation reaches (9000r, 12000r, 9000r, 15000r, 12000r), material pulled off the needed tension obviously began to decline, with further increasing the ease of speed, the material is pulled off the required tension unchanged. Then study the influence factors of Zeta potential of pulp system the analysis and Research on the related mechanism, micro glass fiber slurry concentration is low, the fiber in slurry system settling speed is slower, the same time the volume of settlement and the higher the score, fiber deposition Part structure is loose, the better dispersion performance of the pulp. By reducing the length of fiber dispersion to improve the performance of micro glass fiber slurry by mechanical method, and with the increase of the shear rate, the absolute value of Zeta potential is increased firstly and then decreased, the slurry dispersion state becomes better and worse.PH by changing the electrostatic repulsive force between the fiber to influence the dispersion of micro glass fiber slurry, with the decrease of pH value of the slurry, the dispersion performance of slurry was changed for the better after the variation trend in pH=2.5, to achieve the best dispersion of.SHMP, size PEO, that the use of HEC can improve the dispersion of micro glass fiber slurry system. With the increases, the dispersion effect showed better then worse trend. The optimum amount of each of the SHMP, the best dispersant, PEO, HEC is the worst, SHMP is the best dispersant. The study on low temperature The related thermal conductivity of insulation paper. The results show that the determination of thermal conductivity, the need for drying treatment on micro fiber glass wool insulation composite material, optimal drying time is 60min, drying at 105 deg.c. Low temperature of 29 DEG SR glass fiber cotton thermal conductivity of insulation material prepared by the best, 39 ~ SR. Cotton fibers were prepared by the minimum material thermal conductivity. With the increase of temperature, the different beating degree of micro fiber glass wool insulation material thermal conductivity will increase, the thermal conductivity of 29 DEG SR and 39 DEG SR glass cotton fiber insulation material with little temperature change. The other four beating degree of cotton fiber glass insulation the thermal conductivity of materials showed significant changes, thus it can be seen that 39 DEG SR glass cotton theory is the most suitable insulation material preparation material, reasonable ease the rotation is 12000r. based on micro fiber glass wool insulation composite material X- ray diffraction pattern of the It can be seen that microfiber glass cotton shows less amorphous state of glass fiber degradation, and has a certain skeleton support ability in the final material forming.

【学位授予单位】：陕西科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TB34;TE972

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