CN105086300B - Lightweight conductive shielding composite and preparation method thereof - Google Patents

Lightweight conductive shielding composite and preparation method thereof Download PDF

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Publication number
CN105086300B
CN105086300B CN201510571579.1A CN201510571579A CN105086300B CN 105086300 B CN105086300 B CN 105086300B CN 201510571579 A CN201510571579 A CN 201510571579A CN 105086300 B CN105086300 B CN 105086300B
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fluoroplastics
cnt
conductive shielding
preparation
lightweight conductive
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CN105086300A (en
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王慧
郑康
张献
包超
丁欣
郭乐
田兴友
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China Europe Electronic Materials International Innovation Center
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Hefei Institutes of Physical Science of CAS
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Abstract

The invention discloses a kind of lightweight conductive shielding composite and preparation method thereof.Material is by weight than for 20~60:0.5~20:0.5~40 fluoroplastics, CNT and hollow glass micropearl composition, wherein, fluoroplastics are cystose, and CNT is network structure shape in cystose fluoroplastics;Method is first by fluoroplastics, etching phase, CNT and hollow glass micropearl mix homogeneously, obtain mixture, again mixture is placed in mixing in torque rheometer, obtain mixing materials, afterwards, first mixing materials are placed in hot pressing on vulcanizing press, obtain composite board, composite board is placed in solvent soak to remove again and is dried after etching phase, prepared purpose product.It is good that it has lightweight, capability of electromagnetic shielding reliability and a mechanical property, and process is simple, pollution-free, low cost, the advantage being suitable to large-scale industrial production, is extremely easy in the electronic equipment and congestion system be widely used in the fields such as space flight, aviation, automobile.

Description

Lightweight conductive shielding composite and preparation method thereof
Technical field
The present invention relates to a kind of conductive shield composite and preparation method, especially a kind of lightweight conductive shielding composite wood Material and preparation method thereof.
Background technology
Electromagnetic shielding material has a wide range of applications in some electronic equipments and congestion system.Traditional electromagnetic shielding material Material is typically obtained by metal, though its shield effectiveness is good, but also exists that matter is heavy, perishable, poor processability defect;Being difficult to will It is applied to the fields such as space flight, aviation, automobile.In the recent period, people, in order to obtain lightweight electromagnetic shielding material, have made some beneficial Attempt and effort, one kind as disclosed in Chinese invention patent application prospectus CN 1656574A was in August in 2005 17 days is led The foam of polymers of electricity and elastomer and its manufacture method.The foam of polymers of the conduction described in prospectus is by being polymerized Thing foams and CNT composition compositionss, have the electromagnetic shielding capacity more than or equal to 50dB;Manufacture method is first will Selected specific polymer is received with surfactant, catalyst or foaming agent, firming agent or foaming agent, catalyst, and carbon The fluid composition of mitron carries out foamed or mixture is extruded, then the molding that solidified or froth, and obtains product.But It is, either product, or its manufacture method, all there is weak point, first, the CNT in foam of polymers is because of it Easily reunite, thus extremely difficult in foam be evenly distributed, thus have impact on the electric conductivity of product, particularly have impact on the electromagnetic shielding of product Performance;Secondly, the product being formed because of foaming, not only easily makes CNT therein further reunite when foaming, So that the mechanical property of product is deteriorated, have impact on the scope of its application;Again, manufacture method can neither obtain capability of electromagnetic shielding can Lean on, product that mechanical property is good, need the raw materials such as surfactant, catalyst, foaming agent, firming agent again, easily dirt caused to environment Dye.
Content of the invention
The technical problem to be solved in the present invention is to overcome weak point of the prior art, provides a kind of rational in infrastructure, electricity The lightweight conductive shielding composite that magnetic shield performance is reliable, mechanical property is good.
The invention solves the problems that another technical problem be provide a kind of preparation of above-mentioned lightweight conductive shielding composite Method.
For solving the technical problem of the present invention, the technical scheme being adopted is:Lightweight conductive shielding composite includes fluorine Plastics and CNT, particularly,
Described composite also comprises hollow glass micropearl, the weight of described fluoroplastics, CNT and hollow glass micropearl Amount ratio is 20~60:0.5~20:0.5~40;
Described fluoroplastics are cystose, and it is full fluorine copolymer, or poly- perfluoroalkoxy resin, or polytrifluorochloroethylene, Or ethylene-chlorotrifluoro-ethylene copolymer, or ethylene-tetrafluoroethylene copolymer, or Kynoar, or polyvinyl fluoride;
Described CNT is network structure shape in cystose fluoroplastics.
Improvement further as lightweight conductive shielding composite:
Preferably, CNT is SWCN or multi-walled carbon nano-tubes, and its pipe diameter is 20~30nm, pipe range It is 10~30 μm.
Preferably, the overall diameter of hollow glass micropearl be 10~100 μm, density be 0.2~0.7g/cm3, comprcssive strength be 5~55MPa.
For solving another technical problem of the present invention, another technical scheme being adopted is:Above-mentioned lightweight conductive screen The preparation method covering composite includes melt-blending process, particularly completes step as follows:
Step 1, first by fluoroplastics, etching phase, CNT and hollow glass micropearl mix homogeneously, obtains mixture, its In, etching phase is one of polyethylene, polypropylene, polrvinyl chloride, polystyrene or two or more mixtures, and it is moulded with fluorine The weight of material ratio is for 20~60:20~60, then mixture is placed in torque rheometer, at 150~240 DEG C mixing 5~ 20min, obtains mixing materials;
Step 2, first mixing materials is placed on vulcanizing press, under 200~280 DEG C, 1~10MPa hot pressing 10~ 60min, obtains composite board, then by composite board be placed in solvent soak 2~20h after, be placed at 60~80 DEG C be dried 5~ 15h, prepared lightweight conductive shielding composite.
Improvement further as the preparation method of lightweight conductive shielding composite:
Preferably, CNT is SWCN or multi-walled carbon nano-tubes, and its pipe diameter is 20~30nm, pipe range It is 10~30 μm.
Preferably, the overall diameter of hollow glass micropearl be 10~100 μm, density be 0.2~0.7g/cm3, comprcssive strength be 5~55MPa.
Preferably, temperature when mixing fluoroplastics, etching phase, CNT and hollow glass micropearl is 15~30 DEG C.
Preferably, during mixing, the rotating speed of torque rheometer is 50~100r/min.
Preferably, solvent is toluene, or dimethylbenzene, or xylol.
Preferably, before being dried through the composite board of solvent soaking, first using the deposit on its surface of alcohol flushing.
With respect to the beneficial effect of prior art it is:
First, being characterized using scanning electron microscope to prepared purpose product, from its result, purpose product is abscess And its cystose of distribution uniform in size, it is evenly distributed cancellated CNT and sky in the fluoroplastics constituting foam Heart glass microballoon;Wherein, the pipe diameter of CNT is 20~30nm, pipe range is 10~30 μm, hollow glass micropearl Overall diameter is 10~100 μm.This purpose product being assembled into by cystose fluoroplastics, CNT and hollow glass micropearl, Both its light weight and easy to process had been made due to the substrate performance of cystose fluoroplastics, and because of cancellated CNT equably It is distributed in cystose fluoroplastics and drastically increases electric conductivity, enhance the reliability of capability of electromagnetic shielding;Due also to all The hollow glass micropearl that is distributed in cystose fluoroplastics and not only substantially increase the mechanical property of purpose product, also greatly Promote the dispersibility of CNT and the uniformity of loose structure, more so that purpose product is possessed because of the combination of three Lightweight, capability of electromagnetic shielding reliability and the good feature of mechanical property.
Second, being characterized using vector network analyzer to purpose product, its result shows, the electromagnetic screen of purpose product The spectral range covering is expanded, efficiency is improved.
Third, preparation method is simple, science, efficiently.Not only it has been obtained rational in infrastructure, capability of electromagnetic shielding is reliable, mechanics The good purpose product lightweight conductive shielding composite of performance;Also get rid of wherein one phase macromolecule matrix using etching to reach Arrived the effect of lightweight, and obtain be conducive to absorbing and reflection electromagnetic wave loose structure, be simultaneously introduced stable chemical nature, The hollow glass micro-ball of good fluidity promotes the compatibility of matrix, makes the size of abscess more homogeneous;More have process is simple, Pollution-free, low cost, the advantage being suitable to large-scale industrial production;And then make purpose product be extremely easy to be widely used in boat My god, aviation, in the electronic equipment and congestion system in field such as automobile.
Brief description
Fig. 1 is to one of result that prepared purpose product is characterized using scanning electron microscope (SEM).SEM image shows Going out purpose product is cystose, and uniformly, size is homogeneous for its distribution of cells.
Fig. 2 is to one of result that the purpose product shown in Fig. 1 is characterized using high magnification scanning electron microscope.Can by Fig. 2 a Find out, the CNT in cystose fluoroplastics has defined the conductive network structure of UNICOM;It is micro- that Fig. 2 b shows hollow glass The pearl connection of foam and supporting role in cystose fluoroplastics.
Fig. 3 is to one of result that purpose product is characterized using vector network analyzer.
Specific embodiment
Below in conjunction with the accompanying drawings the optimal way of the present invention is described in further detail.
Buy from market first or be voluntarily obtained:
As the full fluorine copolymer of fluoroplastics, poly- perfluoroalkoxy resin, polytrifluorochloroethylene, ethylene-chlorinated Copolymer, ethylene-tetrafluoroethylene copolymer, Kynoar and polyvinyl fluoride;
As the polyethylene of etching phase, polypropylene, polrvinyl chloride and polystyrene;
As CNT pipe diameter be 20~30nm, pipe range is 10~30 μm of SWCN and Duo Bi CNT;
Overall diameter is 10~100 μm, density is 0.2~0.7g/cm3, comprcssive strength be 5~55MPa hollow glass micro- Pearl;
As the toluene of solvent, dimethylbenzene and xylol.
Then,
Embodiment 1
That prepares concretely comprises the following steps:
Step 1, first by fluoroplastics, etching phase, CNT and hollow glass micropearl according to weight than for 20:60:0.5: 40 ratio mix homogeneously at 15 DEG C, obtains mixture;Wherein, fluoroplastics are Kynoar, and etching phase is polrvinyl chloride, CNT is multi-walled carbon nano-tubes.Again mixture is placed in torque rheometer, kneads under 150 DEG C, 100r/min 20min, obtains mixing materials.
Step 2, first mixing materials is placed on vulcanizing press, and under 200 DEG C, 10MPa, hot pressing 60min, obtains composite plate Material.Again composite board is placed in solvent and soaks after 2h, be placed in and 15h be dried at 60 DEG C;Wherein, solvent is dimethylbenzene, is being dried Before the composite board of solvent soaking, first using the deposit on its surface of alcohol flushing.It is obtained and be similar to shown in Fig. 1 and Fig. 2, with And the lightweight conductive shielding composite as shown in the curve in Fig. 3.
Embodiment 2
That prepares concretely comprises the following steps:
Step 1, first by fluoroplastics, etching phase, CNT and hollow glass micropearl according to weight than for 30:50:5:30 Ratio at 19 DEG C mix homogeneously, obtain mixture;Wherein, fluoroplastics are Kynoar, and etching phase is polrvinyl chloride, carbon Nanotube is multi-walled carbon nano-tubes.Again mixture is placed in torque rheometer, kneads 17min under 175 DEG C, 83r/min, obtain To mixing materials.
Step 2, first mixing materials is placed on vulcanizing press, and under 220 DEG C, 8MPa, hot pressing 48min, obtains composite plate Material.Again composite board is placed in solvent and soaks after 6h, be placed in and 18h be dried at 65 DEG C;Wherein, solvent is dimethylbenzene, is being dried Before the composite board of solvent soaking, first using the deposit on its surface of alcohol flushing.It is obtained and be similar to shown in Fig. 1 and Fig. 2, with And the lightweight conductive shielding composite as shown in the curve in Fig. 3.
Embodiment 3
That prepares concretely comprises the following steps:
Step 1, first by fluoroplastics, etching phase, CNT and hollow glass micropearl according to weight than for 40:40:10:20 Ratio at 23 DEG C mix homogeneously, obtain mixture;Wherein, fluoroplastics are Kynoar, and etching phase is polrvinyl chloride, carbon Nanotube is multi-walled carbon nano-tubes.Again mixture is placed in torque rheometer, kneads 13min under 200 DEG C, 75r/min, obtain To mixing materials.
Step 2, first mixing materials is placed on vulcanizing press, and under 240 DEG C, 5MPa, hot pressing 35min, obtains composite plate Material.Again composite board is placed in solvent and soaks after 11h, be placed in and 10h be dried at 70 DEG C;Wherein, solvent is dimethylbenzene, is being dried Before the composite board of solvent soaking, first using the deposit on its surface of alcohol flushing.It is obtained as depicted in figs. 1 and 2, Yi Jiru Lightweight conductive shielding composite shown in curve in Fig. 3.
Embodiment 4
That prepares concretely comprises the following steps:
Step 1, first by fluoroplastics, etching phase, CNT and hollow glass micropearl according to weight than for 50:30:15:10 Ratio at 27 DEG C mix homogeneously, obtain mixture;Wherein, fluoroplastics are Kynoar, and etching phase is polrvinyl chloride, carbon Nanotube is multi-walled carbon nano-tubes.Again mixture is placed in torque rheometer, kneads 9min under 220 DEG C, 58r/min, obtain To mixing materials.
Step 2, first mixing materials is placed on vulcanizing press, and under 260 DEG C, 3MPa, hot pressing 23min, obtains composite plate Material.Again composite board is placed in solvent and soaks after 16h, be placed in and 13h be dried at 75 DEG C;Wherein, solvent is dimethylbenzene, is being dried Before the composite board of solvent soaking, first using the deposit on its surface of alcohol flushing.It is obtained and be similar to shown in Fig. 1 and Fig. 2, with And the lightweight conductive shielding composite as shown in the curve in Fig. 3.
Embodiment 5
That prepares concretely comprises the following steps:
Step 1, first by fluoroplastics, etching phase, CNT and hollow glass micropearl according to weight than for 60:20:20: 0.5 ratio mix homogeneously at 30 DEG C, obtains mixture;Wherein, fluoroplastics are Kynoar, and etching phase is polychlorostyrene second Alkene, CNT is multi-walled carbon nano-tubes.Again mixture is placed in torque rheometer, kneads under 240 DEG C, 50r/min 5min, obtains mixing materials.
Step 2, first mixing materials is placed on vulcanizing press, and under 280 DEG C, 1MPa, hot pressing 10min, obtains composite plate Material.Again composite board is placed in solvent and soaks after 20h, be placed in and 5h be dried at 80 DEG C;Wherein, solvent is dimethylbenzene, is being dried Before the composite board of solvent soaking, first using the deposit on its surface of alcohol flushing.It is obtained and be similar to shown in Fig. 1 and Fig. 2, with And the lightweight conductive shielding composite as shown in the curve in Fig. 3.
Select the full fluorine copolymer as fluoroplastics more respectively, or poly- perfluoroalkoxy resin, or polytrifluorochloroethylene, or Ethylene-chlorotrifluoro-ethylene copolymer, or ethylene-tetrafluoroethylene copolymer, or Kynoar, or polyvinyl fluoride;As etching One of the polyethylene of phase, polypropylene, polrvinyl chloride, polystyrene or two or more mixtures;As CNT Pipe diameter is 20~30nm, pipe range is 10~30 μm of SWCN or multi-walled carbon nano-tubes;First as solvent Benzene, or dimethylbenzene, or xylol;Repeat above-described embodiment 1~5, be equally obtained as or be similar to shown in Fig. 1 and Fig. 2, with And the lightweight conductive shielding composite as shown in the curve in Fig. 3..
Obviously, those skilled in the art can enter to lightweight conductive shielding composite of the present invention and preparation method thereof Row is various to be changed with modification without departing from the spirit and scope of the present invention.So, if these modifications to the present invention and modification Belong within the scope of the claims in the present invention and its equivalent technologies, then the present invention is also intended to comprise these changes and modification exists Interior.

Claims (7)

1. a kind of preparation method of lightweight conductive shielding composite, including melt-blending process it is characterised in that completing step such as Under:
Step 1, first by fluoroplastics, etching phase, CNT and hollow glass micropearl according to weight than for 20~60: 20~60: 0.5~20:0.5~40 ratio mix homogeneously, obtains mixture, wherein, etching phase be polyethylene, polypropylene, polrvinyl chloride, One of polystyrene or two or more mixtures, then mixture is placed in torque rheometer, at 150~240 DEG C Mixing 5~20min, obtains mixing materials;
Step 2, first mixing materials is placed on vulcanizing press, and under 200~280 DEG C, 1~10MPa, hot pressing 10~60min, obtains To composite board, then composite board is placed in after immersion 2~20h in solvent, is placed in and 5~15h is dried at 60~80 DEG C, be obtained light Matter conductive shield composite;
Described lightweight conductive shielding composite is made up of fluoroplastics, CNT and hollow glass micropearl, and wherein, fluoroplastics are Cystose, it is full fluorine copolymer, or poly- perfluoroalkoxy resin, or polytrifluorochloroethylene, or ethylene-chlorinated copolymerization Thing, or ethylene-tetrafluoroethylene copolymer, or Kynoar, or polyvinyl fluoride, CNT is net in cystose fluoroplastics Network structure shape.
2. the preparation method of lightweight conductive shielding composite according to claim 1, is characterized in that CNT is single Wall carbon nano tube or multi-walled carbon nano-tubes, its pipe diameter is 20~30nm, pipe range is 10~30 μm.
3. the preparation method of lightweight conductive shielding composite according to claim 1, is characterized in that hollow glass micropearl Overall diameter be 10~100 μm, density be 0.2~0.7g/cm3, comprcssive strength be 5~55MPa.
4. the preparation method of lightweight conductive shielding composite according to claim 1, is characterized in that mixing fluoroplastics, quarter Temperature when erosion phase, CNT and hollow glass micropearl is 15~30 DEG C.
5. the preparation method of lightweight conductive shielding composite according to claim 1, is characterized in that torque flow during mixing The rotating speed becoming instrument is 50~100r/min.
6. the preparation method of lightweight conductive shielding composite according to claim 1, is characterized in that solvent is toluene, or Dimethylbenzene.
7. the preparation method of lightweight conductive shielding composite according to claim 1, is characterized in that being dried through solvent Before the composite board soaking, first using the deposit on its surface of alcohol flushing.
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WO2017175807A1 (en) * 2016-04-07 2017-10-12 日本ゼオン株式会社 Fluorinated elastomer composition and molded article
CN107312261A (en) * 2017-06-20 2017-11-03 安徽瑞侃电缆科技有限公司 A kind of polyvinyl chloride cable sheathing compound for automotive wire bundle
CN110733185B (en) * 2019-09-12 2022-02-08 巩义市泛锐熠辉复合材料有限公司 Wave-absorbing sandwich foam and preparation method thereof
CN113430713B (en) * 2021-05-21 2022-12-27 深圳鹏汇功能材料有限公司 Composite board with electromagnetic shielding performance and preparation method thereof
CN115521635B (en) * 2022-10-09 2023-05-02 合肥师范学院 Heat conduction shielding composite material with double-isolation network structure and preparation method thereof

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