CN106564246A - 一种聚吡咯为基底的吸波材料 - Google Patents
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Abstract
本发明公开了一种聚吡咯为基底的吸波材料,其自上而下由阻抗匹配层、损耗层和反射层组成,阻抗匹配层由石墨烯/四氧化三铁粉体分散到聚吡咯中形成,损耗层为羟基铁粉分散到氯丁橡胶中形成,反射层由石墨分散到氯丁橡胶中形成,所述阻抗匹配层含有2‑5%的石墨烯/四氧化三铁粉体。本发明所述的吸波材料,将阻抗匹配层替换为聚吡咯之后,吸波主材料为石墨烯/四氧化三铁粉体,其在厚度为0.2mm时,其最大吸收超过‑17.2dB,性能远远优于采用氯丁橡胶和聚苯胺。
Description
技术领域
本发明涉及新材料技术领域,尤其涉及一种聚吡咯为基底的吸波材料。
本发明是在先申请“一种石墨烯改性的四氧化三铁吸波材料”、“一种石墨烯改性的钛酸钡吸波材料”和“一种改进基底的吸波材料”的改进发明。
背景技术
随着现代科学技术的发展,电磁波辐射对环境的影响日益增大。在机场、机航班因电磁波干扰无法起飞而误点;在医院、移动电话常会干扰各种电子诊疗仪器的正常工作。因此,治理电磁污染,寻找一种能抵挡并削弱电磁波辐射的材料——吸波材料,已成为材料科学的一大课题。
吸波材料指能吸收、衰减投射到材料表面的电磁波能量,并将电磁能通过材料内部的介质损耗转换成成热能等其它形式的能量耗散掉的一类功能材料。吸波材料由吸收剂、胶黏剂及各种助剂组成,其中吸收剂的电磁性能决定了吸波涂层性能的好坏,在细胞材料中起到关键的错用。
研究证实,铁氧体吸波材料性能最佳,它具有吸收频段高、吸收率高、匹配厚度薄等特点。将这种材料应用于电子设备中可吸收泄露的电磁辐射,能达到消除电磁干扰的目的。根据电磁波在介质中从低磁导向高磁导方向传播的规律,利用高磁导率铁氧体引导电磁波,通过共振,大量吸收电磁波的辐射能量,再通过耦合把电磁波的能量转变成热能。
随着现代工艺的发展,对吸波材料的要求越来越高,要求在吸波效果较好的同时,具备较好的物理机械性能、较好的耐高温性以及使用维护简单等。
发明内容
本发明的目的在于提出一种聚吡咯为基底的吸波材料,能够使得吸波材料性能突出。
发明人的在先申请“一种石墨烯改性的钛酸钡吸波材料”和“一种石墨烯改性的四氧化三铁吸波材料”和“一种改进基底的吸波材料”的阻抗匹配层基底分别氯丁橡胶和聚苯胺。发明人对该吸波材料进行了优化,对基底进行了优化,寻求更高性能的吸波材料,以期提高吸波性能。
为达此目的,本发明采用以下技术方案:
一种聚吡咯为基底的吸波材料,其自上而下由阻抗匹配层、损耗层和反射层组成,阻抗匹配层由石墨烯/四氧化三铁粉体分散到聚吡咯中形成,损耗层为羟基铁粉分散到氯丁橡胶中形成,反射层由石墨分散到氯丁橡胶中形成,所述阻抗匹配层含有2-5%的石墨烯/四氧化三铁粉体。
本发明所述聚吡咯形成基体,必须与石墨烯/四氧化三铁粉体联合使用才能使得综合性能提高。发明人尝试在相同的条件下,将石墨烯/四氧化三铁粉体替换为石墨烯/钛酸钡粉体,但其性能下降,所以本发明的基体替换氯丁橡胶和聚苯胺,其性能的提升不是必然的,而是依据不同的吸波主材料而不同。
优选的,所述石墨烯/四氧化三铁粉体制备方法如下:
(1)在冰浴条件下,机械搅拌条件下,在98%浓硫酸中加入鳞片石墨粉,再加入占石墨粉50-80wt%的硝酸钠,和占石墨粉2-4倍重量的高锰酸钾,冰浴下反应30-120min;
(2)加热至30-40℃恒温4-5h,加入去离子水和双氧水,搅拌1-3h,加入5%浓度的HCl离心洗涤直至无硫酸根离子,干燥后得到氧化石墨烯;
(3)将所述的氧化石墨烯分散到无水乙醇溶液中,超声分散得到氧化石墨烯胶体溶液;
(4)将所述氧化石墨烯胶体溶液加热到65-75℃,搅拌下加入质量浓度为70-85%的水合肼,反应0.5-2小时后,按照石墨烯:四氧化三铁质量比为2:1~1:2的比例,加入四氧化三铁粉末,混合均匀;
(5)离心分离并洗涤,真空干燥得到石墨烯/四氧化三铁粉体。
本发明通过特定的配方组分,设计了阻抗匹配层/损耗层/反射层构成的三层复合薄膜,其正面的吸波效果显著优于反面,正面了所述薄膜结构设计的正确。
本发明所述的吸波材料,将阻抗匹配层替换为聚吡咯之后,吸波主材料为石墨烯/四氧化三铁粉体,其在厚度为0.2mm时,其最大吸收超过-17.2dB,性能远远优于采用氯丁橡胶和聚苯胺。
具体实施方式
下面通过具体实施方式来进一步说明本发明的技术方案。
实施例1
一种聚吡咯为基底的吸波材料,其自上而下由阻抗匹配层、损耗层和反射层组成,阻抗匹配层由石墨烯/四氧化三铁粉体分散到聚吡咯中形成,损耗层为羟基铁粉分散到氯丁橡胶中形成,反射层由石墨分散到氯丁橡胶中形成,所述阻抗匹配层含有2%的石墨烯粉末/四氧化三铁粉体。
所述石墨烯粉末/四氧化三铁粉体制备方法如下:
(1)在冰浴条件下,机械搅拌条件下,在98%浓硫酸中加入鳞片石墨粉,再加入占石墨粉80wt%的硝酸钠,和占石墨粉2倍重量的高锰酸钾,冰浴下反应30min;
(2)加热至30℃恒温4h,加入去离子水和双氧水,搅拌1h,加入5%浓度的HCl离心洗涤直至无硫酸根离子,干燥后得到氧化石墨烯;
(3)将所述的氧化石墨烯分散到无水乙醇溶液中,超声分散得到氧化石墨烯胶体溶液;
(4)将所述氧化石墨烯胶体溶液加热到65℃,搅拌下加入质量浓度为85%的水合肼,反应0.5小时后,按照石墨烯:四氧化三铁质量比为1:2的比例,加入四氧化三铁粉末,混合均匀;
(5)离心分离并洗涤,真空干燥得到石墨烯粉末/四氧化三铁粉体。
对比例1
将实施例1中所述阻抗匹配层基底替换为氯丁橡胶,其余与实施例1相同。
对比例2
将实施例1中所述阻抗匹配层基底替换为聚苯胺,其余与实施例1相同。
对比例3
将实施例1中的石墨烯/四氧化三铁粉体替换为石墨烯/钛酸钡粉体,其余与实施例1相同。
实施例1所述的吸波材料,与对比例2的吸波材料对比,当其均在厚度为0.2mm时,本发明其最大吸收超过-17.2dB,远远超过实施例1-3的-9.46dB、-13.6dB证明采用聚吡咯基体以后,相对于氯丁橡胶和聚苯胺基底,性能获得大幅提升。
实施例1与对比例3相比,其不同仅在于基底中掺杂的吸音材料不同,而对比例3的最大吸收仅为-8.79dB,由此证明,本发明的聚吡咯基体与石墨烯/四氧化三铁粉体联合使用,才可以起到性能的提升,二者之间具备特定的配合关系,具有协同作用。
Claims (2)
1.一种聚吡咯为基底的吸波材料,其自上而下由阻抗匹配层、损耗层和反射层组成,阻抗匹配层由石墨烯/四氧化三铁粉体分散到聚吡咯中形成,损耗层为羟基铁粉分散到氯丁橡胶中形成,反射层由石墨分散到氯丁橡胶中形成,所述阻抗匹配层含有2-5%的石墨烯/四氧化三铁粉体。
2.如权利要求1所述的改进基底的吸波材料,其特征在于,所述石墨烯/四氧化三铁粉体制备方法如下:
(1)在冰浴条件下,机械搅拌条件下,在98%浓硫酸中加入鳞片石墨粉,再加入占石墨粉50-80wt%的硝酸钠,和占石墨粉2-4倍重量的高锰酸钾,冰浴下反应30-120min;
(2)加热至30-40℃恒温4-5h,加入去离子水和双氧水,搅拌1-3h,加入5%浓度的HCl离心洗涤直至无硫酸根离子,干燥后得到氧化石墨烯;
(3)将所述的氧化石墨烯分散到无水乙醇溶液中,超声分散得到氧化石墨烯胶体溶液;
(4)将所述氧化石墨烯胶体溶液加热到65-75℃,搅拌下加入质量浓度为70-85%的水合肼,反应0.5-2小时后,按照石墨烯:四氧化三铁质量比为2:1~1:2的比例,加入四氧化三铁粉末,混合均匀;
(5)离心分离并洗涤,真空干燥得到石墨烯粉末/四氧化三铁粉体。
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CN102179965A (zh) * | 2010-12-28 | 2011-09-14 | 中国航空工业集团公司北京航空材料研究院 | 三层复合吸波薄膜及其制备方法 |
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US20090314539A1 (en) * | 2003-03-25 | 2009-12-24 | Shin-Etsu Polymer Co., Ltd. | Electromagnetic noise suppressor, article with electromagnetic noise suppressing function and their manufacturing methods |
CN102179965A (zh) * | 2010-12-28 | 2011-09-14 | 中国航空工业集团公司北京航空材料研究院 | 三层复合吸波薄膜及其制备方法 |
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