CN113756090A - 一种电磁屏蔽功能层材料的制备方法及应用 - Google Patents
一种电磁屏蔽功能层材料的制备方法及应用 Download PDFInfo
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Abstract
本发明涉及复合材料领域,将过渡金属基材料的前驱体与离子交换树脂充分混合,并在表面活性剂作用下均匀吸附在树脂表面,形成杂化前驱体;然后进行惰性气氛高温煅烧,金属前驱体热分解形成金属氧化物,树脂碳化形成三维石墨烯框架,最终得到过渡金属氧化物/三维石墨烯框架复合材料;配制含有磁性金属或金属氧化物纳米颗粒和碳纳米管导电剂的浆料,与过渡金属氧化物/石墨烯框架复合材料充分混合并鼓风干燥,制备负载有磁性金属氧化物纳米颗粒的石墨烯/碳纳米管复合材料,即电磁屏蔽功能层材料;并且将电磁屏蔽功能层材料应用于篷布不仅增加电磁波的屏蔽范围,并且优化其屏蔽效能。
Description
技术领域
本发明涉及复合材料领域,具体涉及一种电磁屏蔽功能层材料的制备方法及应用。
背景技术
电磁屏蔽篷布是用于野外战场通讯指挥、存放精密电子仪器设备和机要人员办公帐篷的主体功能材料,在军民通讯防护领域具有重要意义。电磁屏蔽涂料大多是由高导电率填料或高导磁率填料均匀分散在聚合物基体中加工而成。但由于屏蔽机理单一,使得所制备的电磁屏蔽材料存在电磁屏蔽频段窄以及低频段屏蔽效能不理想等问题。而目前普遍采用的多重功能材料复合法会使制备工艺复杂,因而阻碍了其大规模生产和应用。
发明内容
本发明提供一种电磁屏蔽功能层材料的制备方法,并且将电磁屏蔽功能层材料应用于篷布不仅增加电磁波的屏蔽范围,并且优化其屏蔽效能。
为解决上述技术问题,本发明所采用的技术方案为:
一种电磁屏蔽功能层材料的制备方法,将过渡金属基材料的前驱体与离子交换树脂充分混合,并在表面活性剂作用下均匀吸附在树脂表面,形成杂化前驱体;然后进行惰性气氛高温煅烧,金属前驱体热分解形成金属氧化物,树脂碳化形成三维石墨烯框架,最终得到过渡金属氧化物/三维石墨烯框架复合材料;配制含有磁性金属或金属氧化物纳米颗粒和碳纳米管导电剂的浆料,与过渡金属氧化物/石墨烯框架复合材料充分混合并鼓风干燥,制备负载有磁性金属氧化物纳米颗粒的石墨烯/碳纳米管复合材料,即电磁屏蔽功能层材料。
进一步的,上述制备方法,具体包括以下步骤:
(1)混料
向过渡金属盐水溶液中加入离子交换树脂以及表面活性剂,采用开放式室温搅拌使其充分混合,转速为800r/min,使金属离子充分吸附在离子交换树脂表面;
(2)焙烧
将烘干后的步骤(1)的混合料在800℃氮气气氛下焙烧8h,制备均匀负载金属氧化物纳米颗粒的过渡金属氧化物/三维石墨烯框架复合材料;
(3)屏蔽剂混合
配制含有磁性纳米金属或金属氧化物、纳米碳管导电剂的浆料,与步骤(2)的过渡金属氧化物/三维石墨烯框架复合材料充分混合得屏蔽剂浆料,即电磁屏蔽功能层材料。
进一步的,步骤(1)中的过渡金属盐为硫酸镍、乙酸镍、硫酸铁及硫酸铜中的一种。
进一步的,步骤(1)中的表面活性剂为十六烷基苯磺酸钠。
进一步的,步骤(3)中的磁性金属为铜或银,磁性金属氧化物为氧化镍或四氧化三铁。
优选的,步骤(1)中的过渡金属盐、离子交换树脂、表面活性剂、步骤(3)的磁性纳米金属或金属氧化物及纳米碳管的质量比为10-15:70-80:1-2:5-8:10-15。
另外,本发明还提供上述的制备方法所制备的电磁屏蔽功能层材料在制作篷布、防护服及器件衬垫中的应用,其功能为防止内部电磁信息泄露或外部电磁脉冲干扰。
将电磁屏蔽功能层材料均匀涂覆到导电基布表面形成电磁屏蔽功能层,其中电磁屏蔽功能层的厚度为0.3mm,形成宽频高效电磁屏蔽篷布。
进一步的,在上述电磁屏蔽功能层的表面再涂覆柔性保护膜,并且涂层之间采用粘接剂粘合形成牢固复合层,再将复合层材料在80℃烘干后进行裁剪成型,形成宽频高效电磁屏蔽篷布。
优选的,所述柔性保护膜为柔性聚氨酯膜
进一步的,电磁屏蔽功能层材料所用纳米碳管与导电基布及柔性保护膜的质量比为10-15:13-20:5-15。
与现有技术相比本发明具有以下有益效果:
本发明打破传统单一电磁屏蔽手段,充分利用石墨烯框架材料的结构及性质优势,在三维方向均匀排布具有高比表面积的磁性纳米粒子,并通过与高长径比的碳纳米管复合,形成互穿网络因此,利用该三维石墨烯框架结构构建了具有高导磁性的封闭导电层,实现导电导磁的双功能化。
通过粘接剂复合高频防护的导电基布,从而实现高低频综合高效防护效果。此外,在电磁屏蔽涂层外增加保护膜,极大提高了篷布的柔韧性以及耐候性。
附图说明
图1为三维石墨烯框架结构图。
图2为镍纳米颗粒-碳纳米管复合结构图。
具体实施方式
以下结合具体实施例对本发明作进一步说明。
利用本发明电磁屏蔽功能层材料制备一种宽频高效电磁屏蔽篷布的方法,包括以下步骤:
(1)混料
向过渡金属盐水溶液中加入离子交换树脂以及表面活性剂,采用开放式室温搅拌使其充分混合,转速为800r/min,使金属离子充分吸附在离子交换树脂表面。
(2)焙烧
将烘干后的混合料在800℃氮气气氛下焙烧8h,制备均匀负载金属氧化物纳米颗粒的三维石墨烯框架复合材料。
(3)屏蔽剂混合
配制含有磁性纳米金属或金属氧化物、纳米碳管等导电剂的浆料,与上述过渡金属氧化物/石墨烯框架复合材料充分混合。
(4)涂布
将上述浆料涂布,均匀涂覆到导电基布上,制备厚度在0.3mm(电磁屏蔽功能层的厚度)的电磁屏蔽篷布。在其表面继续涂覆柔性保护膜,并且涂层之间采用粘接剂粘合形成牢固复合层。
(5)烘干成型
将上述材料在80℃烘干后进行裁剪成型,可适当进行涂色。
实施例1-5按照上述制备方法进行,其中各组分的选择及配比按照表1进行:
表1
对上述1-5实施例进行性能测试,结果如表2所示:
表2
Claims (8)
1.一种电磁屏蔽功能层材料的制备方法,其特征在于,将过渡金属基材料的前驱体与离子交换树脂充分混合,并在表面活性剂作用下均匀吸附在树脂表面,形成杂化前驱体;然后进行惰性气氛高温煅烧,金属前驱体热分解形成金属氧化物,树脂碳化形成三维石墨烯框架,最终得到过渡金属氧化物/三维石墨烯框架复合材料;配制含有磁性金属或金属氧化物纳米颗粒和碳纳米管导电剂的浆料,与过渡金属氧化物/石墨烯框架复合材料充分混合并鼓风干燥,制备负载有磁性金属氧化物纳米颗粒的石墨烯/碳纳米管复合材料,即电磁屏蔽功能层材料。
2.根据权利要求1所述的一种电磁屏蔽功能层材料的制备方法,其特征在于,具体包括以下步骤:
(1)混料
向过渡金属盐水溶液中加入离子交换树脂以及表面活性剂,采用开放式室温搅拌使其充分混合,转速为800 r/min,使金属离子充分吸附在离子交换树脂表面;
(2)焙烧
将烘干后的步骤(1)的混合料在800℃氮气气氛下焙烧8h,制备均匀负载金属氧化物纳米颗粒的过渡金属氧化物/三维石墨烯框架复合材料;
(3)屏蔽剂混合
配制含有磁性纳米金属或金属氧化物、纳米碳管导电剂的浆料,与步骤(2)的过渡金属氧化物/三维石墨烯框架复合材料充分混合得屏蔽剂浆料,即电磁屏蔽功能层材料。
3.根据权利要求2所述的一种电磁屏蔽功能层材料的制备方法,其特征在于,步骤(1)中的过渡金属盐为硫酸镍、乙酸镍、硫酸铁及硫酸铜中的一种。
4.根据权利要求2所述的一种电磁屏蔽功能层材料的制备方法,其特征在于,步骤(1)中的表面活性剂为十六烷基苯磺酸钠。
5.根据权利要求2所述的一种电磁屏蔽功能层材料的制备方法,其特征在于,步骤(3)中的磁性金属为铜或银,磁性金属氧化物为氧化镍或四氧化三铁。
6.根据权利要求2所述的一种电磁屏蔽功能层材料的制备方法,其特征在于,步骤(1)中的过渡金属盐、离子交换树脂、表面活性剂、步骤(3)的磁性纳米金属或金属氧化物及纳米碳管的质量比为10-15:70-80:1-2:5-8:10-15。
7.如权利要求1-6任一项所述的制备方法所制备的电磁屏蔽功能层材料在制作篷布、防护服及器件衬垫中的应用。
8.如权利要求1-6任一项所述的制备方法所制备的电磁屏蔽功能层材料在制备宽频高效电磁屏蔽篷布中的应用。
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