轻质环氧树脂复合材料电磁屏蔽性能研究
发布时间：2018-08-15 13:15
【摘要】：电磁波在现代生活中与人类生活息息相关,一方面在医疗、建筑、勘探等方面发挥有益作用,另一方面,电磁波产生的电磁干扰、电磁辐射,对人体及设备带来了负面影响,为了减少电磁波的对设备及人体的危害,可采用电磁屏蔽材料对电磁波进行有效屏蔽,常用的金属类电磁屏蔽材料密度大且易腐蚀,在达到一定的屏蔽效果时,在对材料重量有严格要求、耐腐蚀的环境条件下并不适用。因此,制备轻质高效的电磁屏蔽复合材料,具有重要的理论意义和应用价值。本课题利用炭黑(CB)、石墨导电填料与环氧树脂复合,制备电磁屏蔽复合材料,为了降低复合材料的密度,增加填料的分散性,提高电磁屏蔽复合材料的导电性及电磁屏蔽效能,在炭黑/环氧树脂、石墨/环氧树脂复合材料中添加轻质填料聚苯乙烯(PS)泡沫微球。通过机械搅拌的方法制备了炭黑/PS泡沫微球/环氧树脂复合材料和石墨/PS泡沫微球/环氧树脂轻质复合材料,并研究了复合材料的导电性能、介电性能及其电磁屏蔽性能。研究结果如下:PS泡沫微球的引入降低了CB/环氧树脂体系的密度,与未引入PS泡沫微球时材料密度最低值为1.13 g/cm3相比,引入PS泡沫微球后,体系密度减小,最低值为0.800 g/cm3;提高了炭黑/环氧树脂复合材料的导电相的局部相对体积含量,使炭黑/PS泡沫微球/环氧树脂复合体系的电导率上升,在炭黑体积分数为36%时,其电导率由1.26×10-4S/cm提高至3.30×10-3S/cm;提高了体系的介电常数及介电损耗,增强了体系的电磁屏蔽效能。介电常数实部由25.7增加至34.0。其介电常数虚部由12.6增加至33.4。其介电损耗由0.480增加至1.46。其对电磁波的屏蔽效能由11.9dB增加至15.4dB。在石墨/PS泡沫微球/环氧树脂复合体系中,随着PS泡沫微球与石墨的比例逐渐增大,石墨/PS泡沫微球/环氧树脂复合体系的密度由0.961 g/cm3降低至0.617 g/cm3;而其电导率由比例为0.0125:1时的1.00*10-3S/cm降低至比例为0.025:1时的4.74*10-4S/cm,而在PS泡沫微球与石墨比例为0.05:1时,电导率略增加为4.98*10-4S/cm;随着PS泡沫微球与石墨的比例逐渐增大,介电常数的实部与虚部也呈减小的趋势,其介电常数实部由9.18减小至5.80。其介电常数虚部由0.780减小至0.150。随着PS泡沫微球与石墨的比例逐渐增大,石墨/PS泡沫微球/环氧树脂复合体系的电磁屏蔽效能逐渐减小,比屏蔽效能逐渐增大。复合体系的反射损耗随着PS泡沫微球与石墨的比例增大而减小,其吸收损耗也随着PS泡沫微球与石墨的比例增大而减小。
[Abstract]:Electromagnetic wave is closely related to human life in modern life. On the one hand, it plays a beneficial role in medical treatment, construction, exploration and so on. On the other hand, electromagnetic interference and radiation from electromagnetic wave have a negative impact on human body and equipment. In order to reduce the harm of electromagnetic wave to equipment and human body, electromagnetic shielding material can be used to shield electromagnetic wave effectively. It is not applicable under the condition of strict material weight and corrosion resistance. Therefore, the preparation of electromagnetic shielding composites with light weight and high efficiency has important theoretical significance and application value. In this paper, (CB), graphite conductive filler and epoxy resin are used to prepare electromagnetic shielding composites. In order to reduce the density of composites, increase the dispersion of fillers, improve the conductivity and electromagnetic shielding efficiency of electromagnetic shielding composites. Light filler polystyrene (PS) foam microspheres were added to carbon black / epoxy resin and graphite / epoxy resin composites. Carbon black / PS foam microspheres / epoxy resin composites and graphite / PS foam microspheres / epoxy resin lightweight composites were prepared by mechanical stirring. The conductive properties, dielectric properties and electromagnetic shielding properties of the composites were studied. The results are as follows: the density of CB/ epoxy resin was reduced by the introduction of PS foam microspheres. Compared with the minimum material density of 1.13 g/cm3 without the introduction of PS foam microspheres, the density of the system decreased after the introduction of PS foam microspheres. The lowest value is 0.800 g / cm ~ (3). The local relative volume content of conductive phase of carbon black / epoxy resin composite is increased, and the conductivity of carbon black / PS foam microsphere / epoxy resin composite system is increased, when the volume fraction of carbon black is 36. The conductivity of the system was increased from 1.26 脳 10-4S/cm to 3.30 脳 10 ~ (-3) S / cm, the dielectric constant and dielectric loss of the system were increased, and the electromagnetic shielding efficiency of the system was enhanced. The real part of dielectric constant is increased from 25.7 to 34.0. The imaginary part of its dielectric constant increased from 12.6 to 33.4. The dielectric loss increased from 0.480 to 1.46. Its shielding efficiency to electromagnetic wave is increased from 11.9dB to 15.4dB. In the composite system of graphite / PS foam microspheres / epoxy resin, with the increase of the ratio of PS foam microspheres to graphite, The density of graphite / PS foam microspheres / epoxy resin composite system decreased from 0.961 g/cm3 to 0.617 g / cm ~ 3, and the conductivity of the composite system decreased from 0.0125: 1 1.00*10-3S/cm to 4.74 10 ~ (-4) S / cm of 0.025: 1, while the ratio of PS foam microspheres to graphite was 0.05: 1. The conductivity increased slightly to 4.98 ~ 10 ~ (-4) S / cm, and with the increase of the ratio of PS foam microspheres to graphite, the real and imaginary parts of the dielectric constant decreased, and the real part of the dielectric constant decreased from 9.18 to 5.80. The imaginary part of its dielectric constant is reduced from 0.780 to 0.150. With the increase of the ratio of PS foam microspheres to graphite, the electromagnetic shielding efficiency of graphite / PS foam microspheres / epoxy resin composite system decreases gradually, and the specific shielding efficiency increases gradually. The reflection loss of the composite system decreases with the increase of the ratio of PS foam microspheres to graphite, and the absorption loss decreases with the increase of the ratio of PS foam microspheres to graphite.
【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB33
本文编号：2184312
[Abstract]:Electromagnetic wave is closely related to human life in modern life. On the one hand, it plays a beneficial role in medical treatment, construction, exploration and so on. On the other hand, electromagnetic interference and radiation from electromagnetic wave have a negative impact on human body and equipment. In order to reduce the harm of electromagnetic wave to equipment and human body, electromagnetic shielding material can be used to shield electromagnetic wave effectively. It is not applicable under the condition of strict material weight and corrosion resistance. Therefore, the preparation of electromagnetic shielding composites with light weight and high efficiency has important theoretical significance and application value. In this paper, (CB), graphite conductive filler and epoxy resin are used to prepare electromagnetic shielding composites. In order to reduce the density of composites, increase the dispersion of fillers, improve the conductivity and electromagnetic shielding efficiency of electromagnetic shielding composites. Light filler polystyrene (PS) foam microspheres were added to carbon black / epoxy resin and graphite / epoxy resin composites. Carbon black / PS foam microspheres / epoxy resin composites and graphite / PS foam microspheres / epoxy resin lightweight composites were prepared by mechanical stirring. The conductive properties, dielectric properties and electromagnetic shielding properties of the composites were studied. The results are as follows: the density of CB/ epoxy resin was reduced by the introduction of PS foam microspheres. Compared with the minimum material density of 1.13 g/cm3 without the introduction of PS foam microspheres, the density of the system decreased after the introduction of PS foam microspheres. The lowest value is 0.800 g / cm ~ (3). The local relative volume content of conductive phase of carbon black / epoxy resin composite is increased, and the conductivity of carbon black / PS foam microsphere / epoxy resin composite system is increased, when the volume fraction of carbon black is 36. The conductivity of the system was increased from 1.26 脳 10-4S/cm to 3.30 脳 10 ~ (-3) S / cm, the dielectric constant and dielectric loss of the system were increased, and the electromagnetic shielding efficiency of the system was enhanced. The real part of dielectric constant is increased from 25.7 to 34.0. The imaginary part of its dielectric constant increased from 12.6 to 33.4. The dielectric loss increased from 0.480 to 1.46. Its shielding efficiency to electromagnetic wave is increased from 11.9dB to 15.4dB. In the composite system of graphite / PS foam microspheres / epoxy resin, with the increase of the ratio of PS foam microspheres to graphite, The density of graphite / PS foam microspheres / epoxy resin composite system decreased from 0.961 g/cm3 to 0.617 g / cm ~ 3, and the conductivity of the composite system decreased from 0.0125: 1 1.00*10-3S/cm to 4.74 10 ~ (-4) S / cm of 0.025: 1, while the ratio of PS foam microspheres to graphite was 0.05: 1. The conductivity increased slightly to 4.98 ~ 10 ~ (-4) S / cm, and with the increase of the ratio of PS foam microspheres to graphite, the real and imaginary parts of the dielectric constant decreased, and the real part of the dielectric constant decreased from 9.18 to 5.80. The imaginary part of its dielectric constant is reduced from 0.780 to 0.150. With the increase of the ratio of PS foam microspheres to graphite, the electromagnetic shielding efficiency of graphite / PS foam microspheres / epoxy resin composite system decreases gradually, and the specific shielding efficiency increases gradually. The reflection loss of the composite system decreases with the increase of the ratio of PS foam microspheres to graphite, and the absorption loss decreases with the increase of the ratio of PS foam microspheres to graphite.
【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB33
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