CN106003888B - A kind of flexible extensible electromagnetic shielding film and preparation method thereof - Google Patents
A kind of flexible extensible electromagnetic shielding film and preparation method thereof Download PDFInfo
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Abstract
Description
技术领域technical field
本发明涉及电磁屏蔽材料领域，更具体地说，涉及柔性可拉伸电磁屏蔽膜领域。The present invention relates to the field of electromagnetic shielding materials, and more particularly, to the field of flexible and stretchable electromagnetic shielding films.
背景技术Background technique
随着科技的迅速发展，电磁波在航空、航天、通信、家用电器、军事等领域得到广泛的应用，随之电磁污染问题也日渐突出。电磁波向外辐射的电磁能量正在以每年7％-14％的速度递增，电磁对环境的污染日益严重。在世界各地，各种信息网络传递着数以亿计的军事、政治、经济等方面的重要情报和信息，由于电磁波辐射而导致的信息泄密事件也时有发生，直接威胁到国家政治、经济、军事安全。同时，电磁波还会造成武器系统失灵，给作战带来严重的隐患。因此，防止电磁波辐射，以保障信息、武器系统安全以及人体健康成为迫切任务。With the rapid development of science and technology, electromagnetic waves have been widely used in aviation, aerospace, communications, household appliances, military and other fields, and the problem of electromagnetic pollution has become increasingly prominent. The electromagnetic energy radiated by electromagnetic waves is increasing at a rate of 7%-14% every year, and the electromagnetic pollution to the environment is becoming more and more serious. All over the world, various information networks transmit hundreds of millions of important military, political, economic and other intelligence and information, and information leakage incidents caused by electromagnetic wave radiation also occur from time to time, directly threatening national politics, economy, military security. At the same time, the electromagnetic wave will also cause the failure of the weapon system, which will bring serious hidden dangers to the operation. Therefore, preventing electromagnetic wave radiation to ensure the security of information, weapon systems and human health has become an urgent task.
目前市场上很多电磁屏蔽材料都是通过材料表面金属镀溅、涂覆、贴覆或通过混纺导电纤维等方式，在制备和使用过程中容易出现很多问题，如金属与材料结合能力差，容易脱落，镀层容易被刮擦而失去屏蔽性能，制备过程污染严重等，而且材料较粗硬，柔韧性差，不透气、手感性较差，不可穿戴，而且很难满足现代电磁屏蔽材料所需的“薄、轻、宽、强”的特性，因此，迫切需要研发一种具有高电磁屏蔽性能、柔韧性好、轻薄、耐久性好且可穿戴的电磁屏蔽材料。At present, many electromagnetic shielding materials on the market are made of metal sputtering, coating, pasting or blending conductive fibers on the surface of the material. Many problems are prone to occur in the process of preparation and use, such as poor bonding ability between metal and material, and easy to fall off. , the coating is easily scratched and loses its shielding performance, the preparation process is seriously polluted, etc., and the material is rough and hard, has poor flexibility, is airtight, has poor hand feel, and is not wearable, and it is difficult to meet the requirements of modern electromagnetic shielding materials. Therefore, it is urgent to develop a wearable electromagnetic shielding material with high electromagnetic shielding performance, good flexibility, lightness, durability and wearability.
发明内容SUMMARY OF THE INVENTION
本发明所要解决的技术问题是提供一种具有高电磁屏蔽性能、柔韧性好、轻薄、耐久性好且可穿戴的柔性可拉伸电磁屏蔽膜及其制备方法。The technical problem to be solved by the present invention is to provide a flexible and stretchable electromagnetic shielding film with high electromagnetic shielding performance, good flexibility, lightness and thinness, good durability and wearable, and a preparation method thereof.
为了解决上述技术问题，本发明提供了一种柔性可拉伸电磁屏蔽膜，其特征在于，包括：从下到上依次设置的弹性膜、至少一层柔性纳米电磁屏蔽复合膜和树脂层。In order to solve the above technical problems, the present invention provides a flexible stretchable electromagnetic shielding film, which is characterized by comprising: an elastic film, at least one layer of flexible nano-electromagnetic shielding composite film and a resin layer arranged in sequence from bottom to top.
优选地，所述的弹性膜的下侧粘帖有双面粘性胶体。Preferably, the lower side of the elastic film is pasted with double-sided adhesive colloid.
本发明还提供了上述的柔性可拉伸电磁屏蔽膜的制备方法，其特征在于，包括：The present invention also provides the above-mentioned preparation method of the flexible stretchable electromagnetic shielding film, which is characterized by comprising:
第一步：将碳纳米管膜浸渍在石墨烯悬浮液中，处理一段时间后取出，在室温下自然晾干，得到柔性纳米电磁屏蔽复合膜；Step 1: Immerse the carbon nanotube film in the graphene suspension, take it out after processing for a period of time, and let it dry naturally at room temperature to obtain a flexible nano-electromagnetic shielding composite film;
第二步：选用弹性膜作为弹性附着基体，并对其两端施加一定拉力，将其拉伸到一定伸长率后固定，在弹性膜表面涂覆一层液体弹性粘合剂；The second step: choose the elastic film as the elastic attachment base, and apply a certain tension to both ends, stretch it to a certain elongation and fix it, and coat a layer of liquid elastic adhesive on the surface of the elastic film;
第三步：将第一步得到的柔性纳米电磁屏蔽复合膜压渍在液体弹性粘合剂上，在柔性纳米电磁屏蔽复合膜的上侧涂覆具有保护作用的树脂，形成树脂层，在一定条件下使液体弹性粘合剂和树脂固化，或者，在柔性纳米电磁屏蔽复合膜的上侧粘合另一弹性膜；The third step: pressing the flexible nano-electromagnetic shielding composite film obtained in the first step on the liquid elastic adhesive, and coating the upper side of the flexible nano-electromagnetic shielding composite film with a protective resin to form a resin layer. curing liquid elastic adhesive and resin under conditions, or bonding another elastic film on the upper side of the flexible nano-electromagnetic shielding composite film;
第四步：释放施加在弹性附着基体上的拉力，使其带动柔性纳米电磁屏蔽复合膜回缩，即可制得柔性可拉伸电磁屏蔽膜。The fourth step: releasing the pulling force exerted on the elastic attachment base to drive the flexible nano-electromagnetic shielding composite film to retract, so as to obtain a flexible and stretchable electromagnetic shielding film.
优选地，所述第一步还包括在柔性纳米电磁屏蔽复合膜的端部黏附电极。Preferably, the first step further includes adhering electrodes on the ends of the flexible nano-electromagnetic shielding composite film.
更优选地，所述的电极为铜片、铜丝、导电纤维或其它导电材料。More preferably, the electrodes are copper sheets, copper wires, conductive fibers or other conductive materials.
更优选地，所述的导电纤维为碳纳米管纱线。More preferably, the conductive fibers are carbon nanotube yarns.
更优选地，所述的电极通过导电银胶与柔性纳米电磁屏蔽复合膜相连。More preferably, the electrodes are connected with the flexible nano-electromagnetic shielding composite film through conductive silver glue.
优选地，所述第一步中的碳纳米管膜由单壁或多壁碳纳米管制得，碳纳米管直径为10nm-100nm，膜厚度为10μm-50μm，孔隙率为35％-75％，拉伸强度为100MPa-500MPa，电导率为104-105S/m。Preferably, the carbon nanotube film in the first step is made of single-walled or multi-walled carbon nanotubes, the diameter of the carbon nanotubes is 10 nm-100 nm, the film thickness is 10 μm-50 μm, and the porosity is 35%-75%, The tensile strength is 100MPa-500MPa, and the electrical conductivity is 10 4 -10 5 S/m.
更优选地，所述第一步中的碳纳米管膜的尺寸与拉伸后的弹性附着基体相同。More preferably, the size of the carbon nanotube film in the first step is the same as that of the stretched elastic attachment matrix.
优选地，所述的石墨烯悬浮液的浓度为1mg/ml～50mg/ml，浸渍时间1～5h，浸渍1～3次，可根据需要设计选择。Preferably, the concentration of the graphene suspension is 1 mg/ml to 50 mg/ml, the immersion time is 1 to 5 hours, and the immersion is 1 to 3 times, which can be designed and selected according to needs.
优选地，所述的弹性膜为聚二甲基硅氧烷薄膜、丙烯酸薄膜、聚氨酯薄膜或高弹橡胶薄膜。Preferably, the elastic film is a polydimethylsiloxane film, an acrylic film, a polyurethane film or a high elastic rubber film.
优选地，所述的液体弹性粘合剂为聚二甲基硅氧烷、丙烯酸或聚氨酯。Preferably, the liquid elastic adhesive is polydimethylsiloxane, acrylic or polyurethane.
优选地，所述的具有保护作用的树脂为聚氨酯、聚二甲基硅氧烷或橡胶。树脂的涂覆厚度可根据需要选择。Preferably, the protective resin is polyurethane, polydimethylsiloxane or rubber. The coating thickness of the resin can be selected as required.
优选地，所述的第二步中的伸长率为弹性膜的断裂伸长率的5～50％。Preferably, the elongation in the second step is 5-50% of the elongation at break of the elastic film.
所述的固化时间、温度、压力等条件由所选择的粘合剂和树脂决定。The curing time, temperature, pressure and other conditions are determined by the selected binder and resin.
与现有技术相比，本发明的优点是：Compared with the prior art, the advantages of the present invention are:
(1)本发明采用PDMS膜作为弹性附着基体，并在拉伸的同时与柔性纳米电磁屏蔽膜粘结固化，从而提高了电磁屏蔽膜的柔韧性和弹性。(1) In the present invention, the PDMS film is used as the elastic attachment matrix, and is bonded and cured with the flexible nano-electromagnetic shielding film while being stretched, thereby improving the flexibility and elasticity of the electromagnetic shielding film.
(2)本发明以高电磁屏蔽吸收率的碳纳米管膜浸渍石墨烯悬浮液得到柔性纳米电磁屏蔽复合膜，电磁性能优于传统材料，同时又拥有较大的长径比，具有纳米尺寸效应，相对于其它金属颗粒和石墨颗粒，具有吸收频带宽、多功能、质量轻、厚度薄等特点，同时还采用浸渍石墨烯悬浮液的方式进一步提高了其电磁屏蔽性能。(2) The present invention obtains a flexible nano-electromagnetic shielding composite film by impregnating the graphene suspension with a carbon nanotube film with high electromagnetic shielding absorptivity. The electromagnetic performance is better than that of traditional materials, and at the same time, it has a larger aspect ratio and has a nanometer size effect. Compared with other metal particles and graphite particles, it has the characteristics of wide absorption frequency band, multi-function, light weight and thin thickness. At the same time, the method of dipping graphene suspension further improves its electromagnetic shielding performance.
(3)采用涂覆树脂的方式保护碳纳米管膜，使其不易磨损破坏，电磁屏蔽性能稳定，提高了材料的耐久性。(3) The carbon nanotube film is protected by coating resin, so that it is not easy to wear and damage, the electromagnetic shielding performance is stable, and the durability of the material is improved.
(4)该制备方法简单易行，适合产业化推广，具有广泛的应用前景。(4) The preparation method is simple and feasible, suitable for industrialization promotion, and has wide application prospects.
(5)本发明制备得到的的柔性可拉伸电磁屏蔽膜具有弹性好、伸长率高(20％-50％)，电磁屏蔽性能优良(1-5GHz频率内，电磁波吸收率99％以上)，同时可承受一定弯曲和压缩变形。该弹性电磁屏蔽膜可以用于智能可穿戴服装和多功能电磁防护织物中，在军用和民用的智能防护领域具有广泛的应用。(5) The flexible stretchable electromagnetic shielding film prepared by the present invention has good elasticity, high elongation (20%-50%), and excellent electromagnetic shielding performance (in the frequency of 1-5GHz, the electromagnetic wave absorption rate is over 99%) , and can withstand certain bending and compression deformation. The elastic electromagnetic shielding film can be used in smart wearable clothing and multifunctional electromagnetic protective fabrics, and has wide applications in the fields of military and civilian smart protection.
附图说明Description of drawings
图1是柔性可拉伸电磁屏蔽膜示意图；Figure 1 is a schematic diagram of a flexible stretchable electromagnetic shielding film;
图2是超高屏蔽效能的弹性电磁屏蔽膜示意图；2 is a schematic diagram of an elastic electromagnetic shielding film with ultra-high shielding efficiency;
图3是弹性可拉伸的电磁屏蔽粘附膜示意图。FIG. 3 is a schematic diagram of an elastically stretchable electromagnetic shielding adhesive film.
具体实施方式Detailed ways
下面结合具体实施例，进一步阐述本发明。应理解，这些实施例仅用于说明本发明而不用于限制本发明的范围。此外应理解，在阅读了本发明讲授的内容之后，本领域技术人员可以对本发明作各种改动或修改，这些等价形式同样落于本申请所附权利要求书所限定的范围。The present invention will be further described below in conjunction with specific embodiments. It should be understood that these examples are only used to illustrate the present invention and not to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.
实施例1：超薄弹性可拉伸的电磁屏蔽膜Example 1: Ultra-thin elastic stretchable electromagnetic shielding film
一种柔性可拉伸电磁屏蔽膜的制备方法，具体步骤为：A preparation method of a flexible and stretchable electromagnetic shielding film, the specific steps are:
第一步：将碳纳米管膜浸渍在石墨烯悬浮液中，浸渍时间3h，浸渍1次，取出，在室温下自然晾干，得到柔性纳米电磁屏蔽复合膜2，并在其两端通过导电银胶黏附铜丝电极；The first step: the carbon nanotube film is immersed in the graphene suspension for 3 hours, immersed once, taken out, and dried naturally at room temperature to obtain a flexible nano-electromagnetic shielding composite film 2, which is electrically conductive at both ends. Silver glue sticks copper wire electrodes;
所述的碳纳米管膜选用尺寸为20×28cm2的碳纳米管膜(中国科学院苏州纳米技术与纳米仿生研究所)，由多壁碳纳米管制得，碳纳米管直径为20nm左右，膜厚度为20um，孔隙率为75％，拉伸强度为约200MPa，电导率约1×105S/m；所述的石墨烯悬浮液的浓度为2mg/ml的石墨烯悬浮液(纽美泰新材料有限公司)。The carbon nanotube film is made of a carbon nanotube film with a size of 20 × 28 cm (Suzhou Institute of Nanotechnology and Nano-Bionics, Chinese Academy of Sciences), obtained from multi-walled carbon nanotubes, the diameter of the carbon nanotubes is about 20 nm, and the film thickness is about 20 nm. It is 20um, the porosity is 75%, the tensile strength is about 200MPa, and the electrical conductivity is about 1×10 5 S/m; Materials Co., Ltd.).
第二步：选用弹性膜1作为弹性附着基体，并对其两端施加一定拉力，将其拉伸到一定伸长率(断裂伸长率的40％)后固定，在弹性膜1表面涂覆一层液体弹性粘合剂(PDMS粘合剂)，厚度约为0.2mm；Step 2: Select the elastic film 1 as the elastic attachment base, and apply a certain tension to both ends, stretch it to a certain elongation (40% of the elongation at break), fix it, and coat the surface of the elastic film 1 A layer of liquid elastic adhesive (PDMS adhesive) with a thickness of about 0.2mm;
所述的弹性膜1为方形PDMS膜，尺寸为20×20cm2，厚度为0.3mm。PDMS膜采用PDMS树脂(道康宁公司DC184)通过涂膜方法得到。The elastic film 1 is a square PDMS film with a size of 20×20 cm 2 and a thickness of 0.3 mm. The PDMS film was obtained by a film coating method using PDMS resin (Dow Corning DC184).
所述的PDMS粘合剂采用道康宁公司的SYLGARD184，由基本组分(PDMS液体，粘度5.2Pa-sec)和固化剂(粘度3.5Pa-sec)按10∶1的重量比混匀得到。The PDMS adhesive is SYLGARD184 from Dow Corning, which is obtained by mixing basic components (PDMS liquid, viscosity 5.2 Pa-sec) and curing agent (viscosity 3.5 Pa-sec) in a weight ratio of 10:1.
第三步：将第一步得到的柔性纳米电磁屏蔽复合膜2压渍在液体弹性粘合剂上，在柔性纳米电磁屏蔽复合膜2的上侧涂覆具有保护作用的树脂(水溶性聚氨酯树脂，拜耳科技有限公司，型号：U54)，形成树脂层3，厚度约为0.3mm，保持弹性膜1的拉伸状态，在60℃下使液体弹性粘合剂和树脂固化，时间不低于12小时；The third step: pressing the flexible nano-electromagnetic shielding composite film 2 obtained in the first step on the liquid elastic adhesive, and coating the upper side of the flexible nano-electromagnetic shielding composite film 2 with a protective resin (water-soluble polyurethane resin , Bayer Technology Co., Ltd., model: U54), form a resin layer 3 with a thickness of about 0.3mm, maintain the stretched state of the elastic film 1, and cure the liquid elastic adhesive and resin at 60 ° C for a time of not less than 12 Hour;
第四步：释放施加在弹性附着基体上的拉力，使其带动柔性纳米电磁屏蔽复合膜2回缩，即可制得柔性可拉伸电磁屏蔽膜。The fourth step: releasing the pulling force exerted on the elastic attachment base to drive the flexible nano-electromagnetic shielding composite film 2 to retract, so as to obtain a flexible and stretchable electromagnetic shielding film.
如图1所示，所得的柔性可拉伸电磁屏蔽膜包括：从下到上依次设置的弹性膜1、一层柔性纳米电磁屏蔽复合膜2和树脂层3。As shown in FIG. 1 , the obtained flexible stretchable electromagnetic shielding film includes: an elastic film 1 , a layer of flexible nano-electromagnetic shielding composite film 2 and a resin layer 3 arranged in sequence from bottom to top.
该超薄弹性可拉伸的电磁屏蔽膜可吸收频带宽，电磁屏蔽效能高，在1-5GHz频率内，电磁波吸收率99％以上，屏蔽效能可达35dB，具有“薄、轻、宽、强”的特性，可作为新一代柔性电磁屏蔽材料。The ultra-thin elastic and stretchable electromagnetic shielding film can absorb a wide frequency band and has high electromagnetic shielding efficiency. In the frequency of 1-5GHz, the electromagnetic wave absorption rate is over 99%, and the shielding efficiency can reach 35dB. "Characteristics, can be used as a new generation of flexible electromagnetic shielding materials.
实施例2：超高屏蔽效能的弹性电磁屏蔽膜Example 2: Elastic electromagnetic shielding film with ultra-high shielding efficiency
一种柔性可拉伸电磁屏蔽膜的制备方法，具体步骤为：A preparation method of a flexible and stretchable electromagnetic shielding film, the specific steps are:
第一步：将3片碳纳米管膜分别浸渍在石墨烯悬浮液中，浸渍时间3h，浸渍1次，取出，在室温下自然晾干，得到3层柔性纳米电磁屏蔽复合膜2，在其中两片的一端通过涂覆导电银胶黏附铜丝电极；Step 1: Immerse 3 sheets of carbon nanotube films in graphene suspension for 3 hours, immerse once, take out, and dry naturally at room temperature to obtain 3-layer flexible nano-electromagnetic shielding composite film 2, in which One end of the two pieces is adhered to the copper wire electrode by coating conductive silver glue;
所述的碳纳米管膜选用尺寸为20×30cm2的碳纳米管膜(中国科学院苏州纳米技术与纳米仿生研究所)，由多壁碳纳米管制得，碳纳米管直径为20nm左右，膜厚度为20um，孔隙率为75％，拉伸强度为约200MPa，电导率约1×105S/m；所述的石墨烯悬浮液的浓度为2mg/ml的石墨烯悬浮液(纽美泰新材料有限公司)。The carbon nanotube film is made of a carbon nanotube film with a size of 20 × 30cm (Suzhou Institute of Nanotechnology and Nano-Bionics, Chinese Academy of Sciences), obtained from multi-walled carbon nanotubes, the diameter of the carbon nanotubes is about 20nm, and the film thickness is about 20 nm. It is 20um, the porosity is 75%, the tensile strength is about 200MPa, and the electrical conductivity is about 1×10 5 S/m; Materials Co., Ltd.).
第二步：选用弹性膜1作为弹性附着基体，并对其两端施加一定拉力，将其拉伸到一定伸长率(断裂伸长率的50％)后固定，在弹性膜1表面涂覆一层液体弹性粘合剂(PDMS粘合剂)，厚度约为0.2mm；The second step: select the elastic film 1 as the elastic attachment base, and apply a certain tension to both ends, stretch it to a certain elongation (50% of the elongation at break), fix it, and coat the surface of the elastic film 1 A layer of liquid elastic adhesive (PDMS adhesive) with a thickness of about 0.2mm;
所述的弹性膜1为方形PDMS膜，尺寸为20×20cm2，厚度为0.4mm。PDMS膜采用PDMS树脂(道康宁公司DC184)通过涂膜方法得到。The elastic film 1 is a square PDMS film with a size of 20×20 cm 2 and a thickness of 0.4 mm. The PDMS film was obtained by a film coating method using PDMS resin (Dow Corning DC184).
所述的PDMS粘合剂采用道康宁公司的SYLGARD184，由基本组分(PDMS液体，粘度5.2Pa-sec)和固化剂(粘度3.5Pa-sec)按10∶1的重量比混匀得到。The PDMS adhesive is SYLGARD184 from Dow Corning, which is obtained by mixing basic components (PDMS liquid, viscosity 5.2 Pa-sec) and curing agent (viscosity 3.5 Pa-sec) in a weight ratio of 10:1.
第三步：将第一步得到的3层柔性纳米电磁屏蔽复合膜2依次压渍在液体弹性粘合剂上，带有电极的纳柔性纳米电磁屏蔽复合膜2位于上下两层，相邻两层柔性纳米电磁屏蔽复合膜2之间形成粘合剂层4；The third step: Press the three layers of flexible nano-electromagnetic shielding composite film 2 obtained in the first step on the liquid elastic adhesive in turn. The nano-flexible nano-electromagnetic shielding composite film 2 with electrodes is located on the upper and lower layers, and the adjacent two An adhesive layer 4 is formed between the flexible nano-electromagnetic shielding composite films 2;
在最上层的柔性纳米电磁屏蔽复合膜2的上侧涂覆具有保护作用的树脂(PDMS粘合剂，同第二步)，形成树脂层3，厚度约为0.3mm，保持弹性膜1的拉伸状态，在80℃下使液体弹性粘合剂和树脂固化，时间不低于12小时；Coat the upper side of the uppermost flexible nano-electromagnetic shielding composite film 2 with a protective resin (PDMS adhesive, the same as the second step) to form a resin layer 3 with a thickness of about 0.3mm to maintain the tension of the elastic film 1 In the stretched state, the liquid elastic adhesive and resin are cured at 80°C for not less than 12 hours;
第四步：释放施加在弹性附着基体上的拉力，使其带动柔性纳米电磁屏蔽复合膜2回缩，即可制得柔性可拉伸电磁屏蔽膜。The fourth step: releasing the pulling force exerted on the elastic attachment base to drive the flexible nano-electromagnetic shielding composite film 2 to retract, so as to obtain a flexible and stretchable electromagnetic shielding film.
如图2所示，所得的柔性可拉伸电磁屏蔽膜包括：从下到上依次设置的弹性膜1、三层柔性纳米电磁屏蔽复合膜2和树脂层3。As shown in FIG. 2 , the obtained flexible stretchable electromagnetic shielding film includes: an elastic film 1 , a three-layer flexible nano-electromagnetic shielding composite film 2 and a resin layer 3 arranged in sequence from bottom to top.
该弹性电磁屏蔽膜采用了3层纳米电磁屏蔽复合膜，屏蔽测试结果可达到50dB，即屏蔽效率可达99.999％，可作为工业、军事柔性电磁屏蔽材料，有效防止电磁波辐射和泄露，保障人身安全，维护国家信息、政治、军事安全。The elastic electromagnetic shielding film adopts 3 layers of nano-electromagnetic shielding composite film, and the shielding test result can reach 50dB, that is, the shielding efficiency can reach 99.999%. It can be used as industrial and military flexible electromagnetic shielding material, effectively preventing electromagnetic wave radiation and leakage, and ensuring personal safety , to maintain national information, political and military security.
实施例3：弹性可拉伸的电磁屏蔽粘附膜Example 3: Elastic Stretchable Electromagnetic Shielding Adhesive Film
一种柔性可拉伸电磁屏蔽膜的制备方法，具体步骤为：A preparation method of a flexible and stretchable electromagnetic shielding film, the specific steps are:
第一步：将碳纳米管膜浸渍在石墨烯悬浮液中，浸渍时间3h，浸渍1次，取出，在室温下自然晾干，得到柔性纳米电磁屏蔽复合膜2，并在其两端通过导电银胶黏附铜丝电极；The first step: the carbon nanotube film is immersed in the graphene suspension for 3 hours, immersed once, taken out, and dried naturally at room temperature to obtain a flexible nano-electromagnetic shielding composite film 2, which is electrically conductive at both ends. Silver glue sticks copper wire electrodes;
所述的碳纳米管膜选用尺寸为20×30cm2的碳纳米管膜(中国科学院苏州纳米技术与纳米仿生研究所)，由多壁碳纳米管制得，碳纳米管直径为20nm左右，膜厚度为20um，孔隙率为75％，拉伸强度为约200MPa，电导率约1×105S/m；所述的石墨烯悬浮液的浓度为2mg/ml的石墨烯悬浮液(纽美泰新材料有限公司)。The carbon nanotube film is made of a carbon nanotube film with a size of 20 × 30cm (Suzhou Institute of Nanotechnology and Nano-Bionics, Chinese Academy of Sciences), obtained from multi-walled carbon nanotubes, the diameter of the carbon nanotubes is about 20nm, and the film thickness is about 20 nm. It is 20um, the porosity is 75%, the tensile strength is about 200MPa, and the electrical conductivity is about 1×10 5 S/m; Materials Co., Ltd.).
第二步：选用弹性膜1作为弹性附着基体，并对其两端施加一定拉力，将其拉伸到一定伸长率(断裂伸长率的40％)后固定，在弹性膜1表面涂覆一层液体弹性粘合剂(PDMS粘合剂)，厚度约为0.2mm；Step 2: Select the elastic film 1 as the elastic attachment base, and apply a certain tension to both ends, stretch it to a certain elongation (40% of the elongation at break), fix it, and coat the surface of the elastic film 1 A layer of liquid elastic adhesive (PDMS adhesive) with a thickness of about 0.2mm;
所述的弹性膜1为方形PDMS膜，尺寸为20×20cm2，厚度为0.4mm。PDMS膜采用PDMS树脂(道康宁公司DC184)通过涂膜方法得到。The elastic film 1 is a square PDMS film with a size of 20×20 cm 2 and a thickness of 0.4 mm. The PDMS film was obtained by a film coating method using PDMS resin (Dow Corning DC184).
所述的PDMS粘合剂采用道康宁公司的SYLGARD184，由基本组分(PDMS液体，粘度5.2Pa-sec)和固化剂(粘度3.5Pa-sec)按10∶1的重量比混匀得到。The PDMS adhesive is SYLGARD184 from Dow Corning, which is obtained by mixing basic components (PDMS liquid, viscosity 5.2 Pa-sec) and curing agent (viscosity 3.5 Pa-sec) in a weight ratio of 10:1.
第三步：将第一步得到的柔性纳米电磁屏蔽复合膜2压渍在液体弹性粘合剂上，在柔性纳米电磁屏蔽复合膜2的上侧涂覆具有保护作用的树脂(水溶性聚氨酯树脂，拜耳科技有限公司，型号：U54，厚度约为0.3mm，保持弹性膜1的拉伸状态，在60℃下使液体弹性粘合剂和树脂固化，时间不低于12小时；The third step: pressing the flexible nano-electromagnetic shielding composite film 2 obtained in the first step on the liquid elastic adhesive, and coating the upper side of the flexible nano-electromagnetic shielding composite film 2 with a protective resin (water-soluble polyurethane resin , Bayer Technology Co., Ltd., model: U54, thickness of about 0.3mm, maintain the stretched state of elastic film 1, and cure the liquid elastic adhesive and resin at 60 ° C for not less than 12 hours;
第四步：释放施加在弹性附着基体上的拉力，使其带动柔性纳米电磁屏蔽复合膜2回缩，在弹性膜1的下表面粘附一层双面粘性胶体5，即可制得柔性可拉伸电磁屏蔽膜。The fourth step: release the tension applied on the elastic attachment substrate, so that it drives the flexible nano-electromagnetic shielding composite film 2 to retract, and adheres a layer of double-sided adhesive colloid 5 on the lower surface of the elastic film 1 to obtain a flexible Stretch electromagnetic shielding film.
所述的双面胶4选用厚度为0.5mm的亚克力透明双面胶(上海璨兴复合材料有限公司)。The double-sided tape 4 is made of acrylic transparent double-sided tape with a thickness of 0.5 mm (Shanghai Canxing Composite Materials Co., Ltd.).
如图3所示，所得的柔性可拉伸电磁屏蔽膜包括：从下到上依次设置的弹性膜1、一层柔性纳米电磁屏蔽复合膜2和树脂层3。所述的弹性膜1的下侧粘帖有双面粘性胶体5(尺寸为20×30cm2)。As shown in FIG. 3 , the obtained flexible stretchable electromagnetic shielding film includes: an elastic film 1 , a layer of flexible nano-electromagnetic shielding composite film 2 and a resin layer 3 arranged in sequence from bottom to top. The lower side of the elastic film 1 is pasted with a double-sided adhesive colloid 5 (size is 20×30 cm 2 ).
该电磁屏蔽粘附膜可以迅速粘附在需要屏蔽的结构(如帐篷，电磁发生装置等)表面，形成快速的电磁屏蔽效果。The electromagnetic shielding adhesive film can be quickly adhered to the surface of a structure that needs to be shielded (such as a tent, an electromagnetic generating device, etc.) to form a rapid electromagnetic shielding effect.
本发明并不局限于上述实施方式，上述实施方式仅是示意性的，而非限制性，本领域的技术人员在本发明的启示下，在不脱离本发明宗旨和权利要求所保护范围下，还可以做出很多种形式，这些均属于本发明的保护范围之中。The present invention is not limited to the above-mentioned embodiments, and the above-mentioned embodiments are only illustrative rather than restrictive. Those skilled in the art, under the inspiration of the present invention, without departing from the spirit of the present invention and the protection scope of the claims, Various forms can also be made, which all belong to the protection scope of the present invention.
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| KR102514334B1 (en) * | 2018-05-16 | 2023-03-27 | 쓰리엠 이노베이티브 프로퍼티즈 캄파니 | Shielding tape for electromagnetic wave |
| CN108882661B (en) * | 2018-06-25 | 2020-05-01 | 中国科学院深圳先进技术研究院 | A kind of transparent flexible stretchable electromagnetic shielding film and preparation method thereof |
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| CN110310781A (en) * | 2019-06-18 | 2019-10-08 | 芜湖航天特种电缆厂股份有限公司 | The processing method of ribbon cable with shielded layer and sheath |
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| CN115119485A (en) * | 2021-03-19 | 2022-09-27 | 中国科学院苏州纳米技术与纳米仿生研究所 | Medium-high frequency stretchable carbon nanotube electromagnetic shielding material and preparation method and application thereof |
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