CN104786615A - Nacre-like structure polymer based electromagnetic shielding material and preparation method thereof - Google Patents
Nacre-like structure polymer based electromagnetic shielding material and preparation method thereof Download PDFInfo
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- CN104786615A CN104786615A CN201510190856.4A CN201510190856A CN104786615A CN 104786615 A CN104786615 A CN 104786615A CN 201510190856 A CN201510190856 A CN 201510190856A CN 104786615 A CN104786615 A CN 104786615A
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Abstract
The invention discloses a nacre-like structure polymer based electromagnetic shielding material and a preparation method thereof. The preparation method comprises the following steps: at first, putting dried insulation layer materials and conductive layer materials into a flat vulcanizing machine respectively for hot-press forming, and obtaining insulation sheets and conductive sheets; then, continuously and alternatively laminating the obtained insulation sheets and conductive sheets for n times in the flat vulcanizing machine to form the nacre-like structure polymer based electromagnetic shielding material with (n+1) layers. The process is simple, feasible, simple in equipment and easy for industrialization; the nacre-like structure polymer based electromagnetic shielding material has good electromagnetic shielding property and excellent mechanical property and is flexible and comfortable in texture and can be worn on a human body.
Description
Technical field
The present invention relates to technical field of electromagnetic shielding, particularly a kind of imitative clam shell feature Polymers electromagnetic shielding material and preparation method thereof.
Background technology
In recent years, in medical treatment & health field, increasing researcher starts the advanced technology utilizing microwave to detect, and develops the inside of human body temperature monitor based on passive microwave radiation theory, thus the earlier detection realized relevant diseases such as inside of human body tumours and examination.But in microwave signal detection, the electromagnetic wave in environment can affect the normal work of electronic equipment, thus directly impact is produced on test result.Therefore various countries drop into the material that a large amount of manpower and materials research and development have capability of electromagnetic shielding.
Polymer-based electromagnetic shielding material is with its light weight and easily process and be widely used, the preparation method of conventional macromolecule electromagnetic shielding composite material has surperficial cladding process and conductive filler completion method, due to the complex process of surperficial cladding process, and superficial layer is easily stripped, industrial most widely used or conductive filler completion method, such as (capability of electromagnetic shielding of nanotube-filled polymers matrix composite system, the Plastics such as Luo; 2012; 39 (6); 37-40) at employing melt-blending process, in the MWCNT filling PC/ABS situation of mass content 15%, obtain the effectiveness of about 35dB, but be reduction of the mechanical property of material.(a kind of Novel polymer-based electromagnetic shielding film or sheet material and preparation method thereof: Chinese patent such as Li Jiang, CN102555375,2011) by granulation-extrude-melting-conflux-cut-unsteady flow-superimposed-extrude the film or sheet material that obtain high electromagnetic shielding and high elongation at tear, but preparation process complexity is loaded down with trivial details, cost is high, therefore its application and development is suppressed.
Above-mentioned method respectively has pluses and minuses, wherein the method technique of melt blending is simple, industrialization can be realized, but to improve conductive filler (CNT, carbon black etc.) content be the means of improving performance, not only make the mechanical property of material and machinability significantly reduce, and masking value promote limited.Therefore operating procedure simple, can industrialization be realized, the shielding properties simultaneously still keeping the mechanical performance of material under high capability of electromagnetic shielding or improve material under the condition of fixing conductive materials content becomes the target that research and production worker pursues.
Summary of the invention
For the shortcoming and defect of existing electromagnetic shielding material preparation method, the object of this invention is to provide a kind of preparation method of imitative clam shell feature Polymers electromagnetic shielding material, it can prepare imitative concba lamellar structure Polymers electromagnetic shielding material quickly and efficiently, whole operating procedure is succinct, involved equipment is simple to operation, is easy to realize industrialization.
Another object of the present invention is to provide a kind of imitative clam shell feature Polymers electromagnetic shielding material, and it has good capability of electromagnetic shielding and excellent mechanical performance, and quality is pliable and tough comfortable, wearable in human body.
For achieving the above object, the present invention takes following technical scheme:
A kind of preparation method of imitative clam shell feature Polymers electromagnetic shielding material, first the insulating barrier material of oven dry and conductive layer material are put into vulcanizing press respectively hot-forming, obtain insulating trip and conducting strip, then by the insulating trip obtained and conducting strip in vulcanizing press continuously alternately n compressing tablet be overlapped into the imitative clam shell feature Polymers electromagnetic shielding material of (n+1) layer.
Described insulating barrier material is selected from the one in Kynoar, polyimides and polyurethane, or the blend polymer of at least two kinds.
The preparation of described conductive layer material comprises: after conductive materials and matrix polymer drying, to stir post-drying by dissolution with solvents; Described conductive materials is selected from the one in silver powder, iron powder, copper powder, carbon black, expanded graphite, graphene oxide, Graphene, CNT and tin indium oxide, or the mixture of at least two kinds; Described matrix polymer is selected from the one in Kynoar, polyimides and polyurethane, or the blend polymer of at least two kinds.
The content of described conductive materials in described conductive layer material is 1%-90%.
Described hot-forming temperature is 150-250 DEG C, and the time is 0.5h-3h.
A kind of imitative clam shell feature Polymers electromagnetic shielding material, it comprises the insulating barrier and conductive layer that are superimposed and arrange; This insulating barrier is formed by hot-forming by insulating barrier material, and this conductive layer is formed by hot-forming by insulating barrier material; This conductive layer material comprises matrix polymer and conductive materials.
Described insulating barrier material is selected from the one in Kynoar, polyimides and polyurethane, or the blend polymer of at least two kinds.
Described conductive materials is selected from the one in silver powder, iron powder, copper powder, carbon black, expanded graphite, graphene oxide, Graphene, CNT and tin indium oxide, or the mixture of at least two kinds; Described matrix polymer is selected from the one in Kynoar, polyimides and polyurethane, or the blend polymer of at least two kinds.
The content of described conductive materials in described conductive layer material is 1%-90%.
The invention has the beneficial effects as follows: the present invention, by the inspiration of shell pearl layer, devises the electromagnetic shielding material both with perfect structure and excellent mechanical performance.Electromagnetic shielding material stuctures and properties of the present invention has designability, and compared with the electromagnetic shielding material prepared with traditional preparation methods, due to constructing of imitative clam shell feature, material has higher electromagnetic shielding constant and high mechanical property.The whole operating procedure of the present invention is succinct, and involved equipment is simple to operation, and the large area that can realize material is produced.Needed raw material is commercially available, without the need to synthesizing other chemicals, is applicable to multiple co-mixing system.
Detailed description of the invention
Below by way of enforcement, the present invention is further described specifically.In following embodiment, the consumption of each component is weight consumption.What be necessary to herein means out is that following examples are only for the present invention is described further; limiting the scope of the invention can not be interpreted as; this art skilled person makes improvement and the adjustment of some non-intrinsically safes according to the invention described above content, still belongs to protection scope of the present invention.
Embodiment 1
Raw material is Kynoar and CNT, and insulating barrier and conductive layer are respectively pure Kynoar and carbon nano-tube filled Kynoar.First prepare common carbon nano-tube filled Kynoar, the content of CNT is 50%: after Kynoar and CNT drying, to stir post-drying by dissolution with solvents.Then by dry after insulating barrier and conductive layer hot-forming on vulcanizing press, hot pressing temperature is 200 DEG C, and pressure is 10MPa, obtains insulating trip and conducting strip respectively.Finally insulating trip and conducting strip are replaced hot pressing 4 times continuously, prepare the imitative clam shell feature Kynoar base electromagnetic screen material of 5 layers.The electromagnet shield effect of this material is 60dB, and hot strength is 80MPa.As a comparison, the electromagnet shield effect of the polyvinylidene fluoride-based composite of individual layer same carbon nanotube content prepared by conventional method is 43dB, hot strength is 55MPa.
Embodiment 2
Raw material is polyimides and CNT, and insulating barrier and conductive layer are respectively pure polyimides and carbon nano-tube filled polyimides.First prepare common carbon nano-tube filled polyimides, the content of CNT is 50%: after polyimides and CNT drying, to stir post-drying by dissolution with solvents.Then by dry after insulating barrier and conductive layer hot-forming on vulcanizing press, hot pressing temperature is 190 DEG C, and pressure is 10MPa, obtains insulating trip and conducting strip respectively.Finally insulating trip and conducting strip are replaced hot pressing 6 times continuously, prepare the imitative clam shell feature polyimides base electromagnetic screen material of 7 layers.The electromagnet shield effect of this material is 80dB, and hot strength is 120MPa.As a comparison, the shield effectiveness of individual layer same carbon nanotube content polyimide-based composite material prepared by conventional method is 58dB, hot strength is 75MPa.
Embodiment 3
Raw material is Kynoar, CNT and carbon black, and insulating barrier and conductive layer are respectively pure Kynoar and CNT, carbon black filled Kynoar.First prepare common CNT, carbon black filled Kynoar, the content of CNT is 40%, and the content of carbon black is 30%: after Kynoar, CNT and carbon black drying, to stir post-drying by dissolution with solvents.Then by dry after insulating barrier and conductive layer hot-forming on vulcanizing press, hot pressing temperature is 200 DEG C, and pressure is 10MPa, obtains insulating trip and conducting strip respectively.Finally insulating trip and conducting strip are replaced hot pressing 6 times continuously, prepare the imitative clam shell feature Kynoar base electromagnetic screen material of 7 layers.The electromagnet shield effect of this material is 78dB, and hot strength is 116MPa.As a comparison, the individual layer same carbon nanotube prepared of conventional method and content of carbon black polyvinylidene fluoride-based composite shield effectiveness are 52dB, hot strength is 71MPa.。
Embodiment 4
Raw material is polyimides, CNT and carbon black, and insulating barrier and conductive layer are respectively pure polyimides and CNT, carbon black filled polyimides.First prepare common carbon black, carbon nano-tube filled polyimides, the content of CNT is 40%, and content of carbon black is 30%: after polyimides, CNT and carbon black drying, to stir post-drying by dissolution with solvents.Then by dry after insulating barrier and conductive layer hot-forming on vulcanizing press, hot pressing temperature is 190 DEG C, and pressure is 10MPa, obtains insulating trip and conducting strip respectively.Finally insulating trip and conducting strip are replaced hot pressing 4 times continuously, prepare the imitative clam shell feature polyimides base electromagnetic screen material of 5 layers.The electromagnet shield effect of this material is 62dB, and hot strength is 87MPa.As a comparison, individual layer same carbon nanotube, content of carbon black polyimide-based composite material shield effectiveness prepared by conventional method are 47dB, hot strength is 61MPa.
Embodiment 5
Raw material is polyimides, Kynoar, CNT and carbon black, and insulating barrier and conductive layer are respectively polyimides, Kynoar and CNT, carbon black filled polyimides.First prepare common carbon black, carbon nano-tube filled polyimides, the content of CNT is 50%, and content of carbon black is 30%: after polyimides, CNT and carbon black drying, to stir post-drying by dissolution with solvents.Then Kynoar is mixed by 1:1 with polyimides, obtain insulating barrier by the dissolution with solvents post-drying that stirs, finally by the insulating barrier after drying and conductive layer hot-forming on vulcanizing press, hot pressing temperature is 250 DEG C, pressure is 10MPa, obtains insulating trip and conducting strip respectively.Finally insulating trip and conducting strip are replaced hot pressing 4 times continuously, prepare the imitative clam shell feature polyimides base electromagnetic screen material of 5 layers.The electromagnet shield effect of this material is 80dB, and hot strength is 120MPa.As a comparison, individual layer same carbon nanotube, content of carbon black polyimides and polyvinylidene fluoride composite material shield effectiveness prepared by conventional method are 70dB, hot strength is 88MPa.
The method of clam shell feature Polymers electromagnetic shielding material is imitated in preparation disclosed by the invention, is characterized in utilizing compression molding machine to prepare two kinds of alternatively distributed imitative clam shell feature lamellar composite electromagnetic shielding materials of polymer.This electromagnetic shielding material constructs due to imitative clam shell feature the effect making pure polymer layer play Stress transmit, therefore the elongation at break of material and hot strength are far above common intermingling material, there is pliable and tough comfortable texture, be convenient to be worn on human body, improve the capability of electromagnetic shielding of material in upper frequency district simultaneously, reason is that higher impedance mismatch degree makes reflection of electromagnetic wave loss increase, and simultaneously unique imitative concba lamellar structure too increases material to electromagnetic absorption loss.
Compared with conventional method, the imitative clam shell feature Polymers electromagnetic shielding material adopting method of the present invention to prepare, in replacing stratiform continuous structure, has the electromagnetic shielding efficiency of better mechanical property and Geng Gao.The method prepares the new method of high-strength and high ductility composite electromagnetic shield materials.
In sum, tool of the present invention has the following advantages:
1, the equipment involved by present invention process is simple and easy to get, and needed raw material is commercially available, without the need to synthesizing other chemicals.Present invention process method has simple to operation, and production cost is low, efficiency high.
2, the imitative clam shell feature Polymers electromagnetic shielding material prepared of the present invention, for the polymer insulation layer by least one deck, at least one deck contains conductive materials is filler, be that the conductive layer of matrix is superimposed to form with polymer, locality can assemble the anisotropic conducing composite material formed, more easily obtain desirable effectiveness.
Macroscopical area of the imitative clam shell feature Polymers electromagnetic shielding material 3, prepared by the present invention can be controlled in 1cm
2-10000cm
2between, the free degree is large, is convenient to industrial production.
4, the present invention can by controlling hot pressing temperature and time or carrying out Effective Regulation by the content of adjustment conductive materials to the microstructure of imitative shellfish material.
5, compared with traditional preparation methods, by imitative clam shell feature Polymers electromagnetic shielding material prepared by the present invention, its different component is acted synergistically by layered interface, more can give full play to the capability of electromagnetic shielding of each component, the bulk shielding performance of material is improved, and along with increasing of the number of plies, synergy is more obvious, and the shielding properties of material is more excellent.
6, compared with traditional preparation methods, the imitative clam shell feature Polymers electromagnetic shielding material prepared by the present invention is owing to having alternately stratiform continuous structure and have more excellent mechanical property.
7, the imitative clam shell feature Polymers electromagnetic shielding material adopting the present invention to prepare has wide practical use in industries such as machinery, military affairs, space flight, precision instruments.
The above is only preferred embodiment of the present invention, not does any pro forma restriction to structure of the present invention.Every above embodiment is done according to technical spirit of the present invention any simple modification, equivalent variations and modification, all still belong in the scope of technical scheme of the present invention.
Claims (9)
1. the preparation method of an imitative clam shell feature Polymers electromagnetic shielding material, it is characterized in that: first the insulating barrier material of oven dry and conductive layer material are put into vulcanizing press respectively hot-forming, obtain insulating trip and conducting strip, then by the insulating trip obtained and conducting strip in vulcanizing press continuously alternately n compressing tablet be overlapped into the imitative clam shell feature Polymers electromagnetic shielding material of (n+1) layer.
2. the preparation method of imitative clam shell feature Polymers electromagnetic shielding material according to claim 1, is characterized in that: described insulating barrier material is selected from the one in Kynoar, polyimides and polyurethane, or the blend polymer of at least two kinds.
3. the preparation method of imitative clam shell feature Polymers electromagnetic shielding material according to claim 1, is characterized in that: the preparation of described conductive layer material comprises: after conductive materials and matrix polymer drying, to stir post-drying by dissolution with solvents; Described conductive materials is selected from the one in silver powder, iron powder, copper powder, carbon black, expanded graphite, graphene oxide, Graphene, CNT and tin indium oxide, or the mixture of at least two kinds; Described matrix polymer is selected from the one in Kynoar, polyimides and polyurethane, or the blend polymer of at least two kinds.
4. the preparation method of imitative clam shell feature Polymers electromagnetic shielding material according to claim 3, is characterized in that: the content of described conductive materials in described conductive layer material is 1%-90%.
5. the preparation method of imitative clam shell feature Polymers electromagnetic shielding material according to claim 1, it is characterized in that: described hot-forming temperature is 150-250 DEG C, the time is 0.5h-3h.
6. an imitative clam shell feature Polymers electromagnetic shielding material, is characterized in that: it comprises the insulating barrier and conductive layer that are superimposed and arrange; This insulating barrier is formed by hot-forming by insulating barrier material, and this conductive layer is formed by hot-forming by insulating barrier material; This conductive layer material comprises matrix polymer and conductive materials.
7. imitative clam shell feature Polymers electromagnetic shielding material according to claim 6, is characterized in that: described insulating barrier material is selected from the one in Kynoar, polyimides and polyurethane, or the blend polymer of at least two kinds.
8. imitative clam shell feature Polymers electromagnetic shielding material according to claim 6, it is characterized in that: described conductive materials is selected from the one in silver powder, iron powder, copper powder, carbon black, expanded graphite, graphene oxide, Graphene, CNT and tin indium oxide, or the mixture of at least two kinds; Described matrix polymer is selected from the one in Kynoar, polyimides and polyurethane, or the blend polymer of at least two kinds.
9. imitative clam shell feature Polymers electromagnetic shielding material according to claim 8, is characterized in that: the content of described conductive materials in described conductive layer material is 1%-90%.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105235319A (en) * | 2015-11-04 | 2016-01-13 | 陕西长石电子材料股份有限公司 | Composite electromagnetic radiation prevention insulating plate manufacturing method |
| CN105420928A (en) * | 2015-11-04 | 2016-03-23 | 北京国科华仪科技有限公司 | Flexible nacre-like structure electromagnetic shielding fiber material and preparing method thereof |
| CN110492021A (en) * | 2018-05-14 | 2019-11-22 | 奥迪股份公司 | The lid and battery case of battery case for high-voltage vehicle battery |
| CN111621138A (en) * | 2020-06-29 | 2020-09-04 | 江西伟普科技有限公司 | Flexible heat-conducting shielding material and preparation method thereof |
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| CN101214722A (en) * | 2007-12-28 | 2008-07-09 | 四川大学 | Method for preparing designable layered polymer base conductive composite material |
| US20120091615A1 (en) * | 2010-10-06 | 2012-04-19 | Wenzel Edward J | Method and apparatus for providing reinforced composite materials with emi shielding |
| CN102555375A (en) * | 2011-12-29 | 2012-07-11 | 四川大学 | Novel polymer-based electromagnetic shielding film or sheet and preparation method thereof |
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2015
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101214722A (en) * | 2007-12-28 | 2008-07-09 | 四川大学 | Method for preparing designable layered polymer base conductive composite material |
| US20120091615A1 (en) * | 2010-10-06 | 2012-04-19 | Wenzel Edward J | Method and apparatus for providing reinforced composite materials with emi shielding |
| CN102555375A (en) * | 2011-12-29 | 2012-07-11 | 四川大学 | Novel polymer-based electromagnetic shielding film or sheet and preparation method thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105235319A (en) * | 2015-11-04 | 2016-01-13 | 陕西长石电子材料股份有限公司 | Composite electromagnetic radiation prevention insulating plate manufacturing method |
| CN105420928A (en) * | 2015-11-04 | 2016-03-23 | 北京国科华仪科技有限公司 | Flexible nacre-like structure electromagnetic shielding fiber material and preparing method thereof |
| CN110492021A (en) * | 2018-05-14 | 2019-11-22 | 奥迪股份公司 | The lid and battery case of battery case for high-voltage vehicle battery |
| CN111621138A (en) * | 2020-06-29 | 2020-09-04 | 江西伟普科技有限公司 | Flexible heat-conducting shielding material and preparation method thereof |
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