CN115746531A - PC-ABS electromagnetic shielding composite material and preparation method and application thereof - Google Patents
PC-ABS electromagnetic shielding composite material and preparation method and application thereof Download PDFInfo
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- XECAHXYUAAWDEL-UHFFFAOYSA-N acrylonitrile butadiene styrene Chemical compound C=CC=C.C=CC#N.C=CC1=CC=CC=C1 XECAHXYUAAWDEL-UHFFFAOYSA-N 0.000 claims description 19
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Abstract
The invention particularly relates to a PC-ABS electromagnetic shielding composite material and a preparation method and application thereof, belonging to the technical field of high polymer materials, wherein the composite material comprises the following raw materials: the modified carbon nano tube is a maleic anhydride grafted carbon nano tube; the surface modification of the carbon nano tube can improve the absorption loss and the multiple reflection attenuation, the hollow structure of the carbon nano tube can increase the dissipation path of electromagnetic waves and enhance the interface polarization effect, and the prepared PC/ABS electromagnetic shielding composite material not only has excellent dielectric property, but also has good processability by blending the conductor-insulator core-shell type nano conductive filler taking the carbon nano tube as a core and maleic anhydride as a shell and the PC/ABS base material.
Description
Technical Field
The invention belongs to the technical field of high polymer materials, and particularly relates to a PC-ABS electromagnetic shielding composite material, and a preparation method and application thereof.
Background
With the development of scientific technology and electronic industry, various electronic products for civil and military use are more and more widely applied. Most of the electronic devices are composed of large-scale or ultra-large-scale circuits, and are easily subjected to external or mutual electromagnetic interference to cause acoustic image obstruction and even misoperation, and the electromagnetic interference becomes a new social public hazard. Plastics are increasingly used in electronic device housings due to their light weight, corrosion resistance, good plasticity, low cost, and the like. However, as common plastics are used as insulators, on one hand, static electricity is easy to accumulate, and fire and even explosion are easy to cause in flammable and explosive places; on the other hand, the electromagnetic wave shielding film is almost transparent to electromagnetic waves, cannot absorb or reflect the electromagnetic waves and does not have the electromagnetic shielding function.
The filling type composite electromagnetic shielding material is prepared by taking high molecular resin as a matrix, adding a certain amount of conductive filler into the matrix through melt blending, solution blending, in-situ polymerization, coprecipitation method and the like, so that the filling type composite electromagnetic shielding material has the advantages of easiness in forming, good corrosion resistance, good mechanical property, suitability for mass production and the like. The method makes up the defects of a metal shielding body and a surface coating type composite shielding material, has better application prospect, and still has some defects. For example, the shielding mechanism of electromagnetic waves is biased toward reflection loss rather than absorption loss, and thus, the application of the shielding mechanism in various fields is difficult to satisfy.
Disclosure of Invention
The application aims to provide a PC-ABS electromagnetic shielding composite material, and a preparation method and application thereof, so as to solve the problem of poor electromagnetic shielding performance at present.
The embodiment of the invention provides a PC-ABS electromagnetic shielding composite material, which comprises the following raw materials: polycarbonate, acrylonitrile-butadiene-styrene, a modified carbon nano tube and an auxiliary agent, wherein the modified carbon nano tube is a maleic anhydride grafted carbon nano tube.
Optionally, the raw materials of the composite material further include: and (3) oxidizing the graphene.
Optionally, the raw materials of the composite material include, by mass:
20-40% of polycarbonate, 10-30% of acrylonitrile-butadiene-styrene, 1-10% of modified carbon nanotube, 1-5% of graphene oxide and 0.1-1% of auxiliary agent.
Optionally, the raw materials of the composite material include, by mass:
25-35% of polycarbonate, 15-25% of acrylonitrile-butadiene-styrene, 3-8% of modified carbon nanotube, 2-4% of graphene oxide and 0.3-0.7% of auxiliary agent.
Optionally, the auxiliary agent comprises: a toughening agent and an antioxidant.
Based on the same inventive concept, the embodiment of the invention also provides a preparation method of the PC-ABS electromagnetic shielding composite material, which comprises the following steps:
premixing polycarbonate and acrylonitrile-butadiene-styrene to obtain an initial mixture;
mixing the rest raw materials and the initial mixture for the second time to obtain a secondary mixed material;
and heating, melting, extruding and granulating the secondary mixed material to obtain the PC-ABS electromagnetic shielding composite material.
Optionally, the temperature of the heating and melting is 220-250 ℃.
Optionally, the method further comprises drying the polycarbonate and acrylonitrile butadiene styrene.
Optionally, the drying temperature is 80-100 ℃, and the drying time is 2-4h.
Based on the same inventive concept, the embodiment of the invention also provides an electronic equipment shell, and the shell is made of the PC-ABS electromagnetic shielding composite material.
One or more technical solutions in the embodiments of the present invention at least have the following technical effects or advantages:
according to the PC-ABS electromagnetic shielding composite material provided by the embodiment of the invention, the absorption loss and the multiple reflection attenuation can be improved by carrying out surface modification on the carbon nano tube, the hollow structure of the carbon nano tube can increase the dissipation path of electromagnetic waves and enhance the interface polarization effect, and the prepared PC/ABS electromagnetic shielding composite material not only has excellent dielectric property, but also has good processability by blending the conductor-insulator core-shell type nano conductive filler taking the carbon nano tube as a core and maleic anhydride as a shell and the PC/ABS base material.
The above description is only an overview of the technical solutions of the present invention, and the present invention can be implemented in accordance with the content of the description so as to make the technical means of the present invention more clearly understood, and the above and other objects, features, and advantages of the present invention will be more clearly understood.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a process flow diagram provided by an embodiment of the present invention;
fig. 2 is a flow chart of a method provided by an embodiment of the invention.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are for the purpose of illustrating the invention and are not to be construed as limiting the invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control.
Unless otherwise specifically indicated, various raw materials, reagents, instruments, equipment and the like used in the present invention may be commercially available or may be prepared by existing methods.
In order to solve the technical problems, the general idea of the embodiment of the application is as follows:
according to an exemplary embodiment of the present invention, there is provided a PC-ABS electromagnetic shielding composite material, the composite material comprising raw materials of: polycarbonate, acrylonitrile-butadiene-styrene, a modified carbon nano tube and an auxiliary agent, wherein the modified carbon nano tube is a maleic anhydride grafted carbon nano tube.
By adopting the design, the absorption loss and the multiple reflection attenuation can be improved by carrying out surface modification on the carbon nano tube, the hollow structure of the carbon nano tube can increase the dissipation path of electromagnetic waves and enhance the interface polarization effect, and the prepared PC/ABS electromagnetic shielding composite material not only has excellent dielectric property, but also has good processability by blending the conductor-insulator core-shell type nano conductive filler taking the carbon nano tube as a core and maleic anhydride as a shell and the PC/ABS base material.
In some embodiments, the feedstock for the composite material further comprises: and (3) oxidizing the graphene.
By adopting the design, the polarization loss of electromagnetic waves can be increased by functional groups and defects contained on the surface of the graphene oxide; the introduction of graphene and the covalent C-C bond combination can improve the dispersibility of the carbon nano tube and reduce the surface contact resistance; the graphene/carbon nano tube multilayer structure is beneficial to enhancing the polarization effect of the composite material, increasing the dielectric loss way and effectively improving the electromagnetic wave loss capability.
In some embodiments, the raw materials of the composite material comprise, in mass fraction:
20-40% of Polycarbonate (PC), 10-30% of acrylonitrile-butadiene-styrene (ABS), 1-10% of modified carbon nano tube, 1-5% of graphene oxide and 0.1-1% of auxiliary agent.
The polycarbonate is used for providing mechanical properties of a base material, the mass fraction of the polycarbonate is controlled to be 20-40%, and the polycarbonate is the base material of an alloy material, so that sufficient alloy material can be formed with acrylonitrile-butadiene-styrene in the mass fraction range, if the polycarbonate resin is too much, the acrylonitrile-butadiene-styrene resin is too little, and sufficient alloy material cannot be formed, and if the polycarbonate resin is too little, the acrylonitrile-butadiene-styrene resin is too much, and sufficient alloy material cannot be formed;
the acrylonitrile-butadiene-styrene is used for providing the processability of the substrate, controlling the mass fraction of the acrylonitrile-butadiene-styrene to be 10-30%, and in the mass fraction range, enough alloy material can be formed with the polycarbonate, if the acrylonitrile-butadiene-styrene resin is too much, the polycarbonate resin is too little, and the alloy material cannot be formed sufficiently, and if the polycarbonate resin is too little, the polycarbonate resin is too much, and the alloy material cannot be formed sufficiently;
the modified carbon nano tube can increase the dissipation path of electromagnetic waves, enhance the interface polarization effect, control the mass fraction of the modified carbon nano tube to be 1-10%, and exert the function of the modified carbon nano tube within the mass fraction range, if the modified carbon nano tube contains too many components, the mechanical property of the alloy material is influenced, and if the modified carbon nano tube contains too few components, the electromagnetic wave loss capability of the material cannot be exerted;
the graphene oxide has the effects of enhancing the polarization effect of the composite material, increasing the dielectric loss way, controlling the mass fraction of the graphene oxide to be 1% -5%, and in the range of the mass fraction, the graphene oxide can play a role, the mass fraction is too large to form an optimal graphene/carbon nanotube multilayer structure with the modified carbon nanotube, the polarization effect of the composite material is played, and if the mass fraction is too small, the graphene oxide cannot form the optimal graphene/carbon nanotube multilayer structure with the modified carbon nanotube, and the polarization effect of the composite material is played;
the auxiliary agent has the effects of improving the compatibility between the alloy material and the graphene/carbon nano tube, controlling the mass fraction of the auxiliary agent to be 0.1-1%, and playing the role of the auxiliary agent within the mass fraction range;
in some embodiments, the raw materials of the composite material comprise, in mass fraction:
25% -35% of polycarbonate, 15% -25% of acrylonitrile-butadiene-styrene, 3% -8% of modified carbon nano tube, 2% -4% of graphene oxide and 0.3% -0.7% of auxiliary agent.
In some embodiments, the adjuvant comprises: toughening agent and antioxidant, wherein the toughening agent can be selected from glycidyl methacrylate grafted polyolefin elastomer (POE-g-GMA), and the antioxidant can be selected from antioxidant 1010.
According to another exemplary embodiment of the present invention, there is provided a method for preparing the PC-ABS electromagnetic shielding composite material as described above, the method including:
s0, according to a material formula, the material comprises the following components in percentage by mass: 20% -40% of Polycarbonate (PC); 10 to 30 percent of acrylonitrile-butadiene-styrene (ABS); 1% -10% of maleic anhydride grafted carbon nano-tubes; 1% -10% of graphene oxide; 0.1 to 1 percent of auxiliary agent, and accurately weighing each component;
s1, premixing polycarbonate and acrylonitrile-butadiene-styrene to obtain an initial mixture;
specifically, in the embodiment, the dried PC resin and the dried ABS resin are sequentially poured into a stirring barrel, and the materials are premixed for 3-5 min, and then mixed uniformly to obtain an initial mixture;
s2, mixing the residual raw materials and the initial mixture for the second time to obtain a secondary mixed material;
specifically, in the embodiment, the initial mixture, the maleic anhydride grafted carbon nanotube, the graphene oxide and the auxiliary agent which are weighed according to the formula are poured into the stirring barrel again to be mixed for the second time, the mixing time is 3-5 min, and the secondary mixed material is prepared after uniform mixing;
and S3, heating, melting, extruding and granulating the secondary mixed material to obtain the PC-ABS electromagnetic shielding composite material.
Specifically, in this example, the secondary mixture was put into the main hopper of a twin-screw extruder, and was heated, melted, extruded and pelletized to obtain a PC/ABS composite material.
In some embodiments, the temperature of the heat-melting is 220-250 ℃.
According to another exemplary embodiment of the present invention, there is provided an electronic device housing made of the PC-ABS electromagnetic shielding composite material as described above.
The PC-ABS electromagnetic shielding composite material of the present application, the preparation method and the application thereof will be described in detail with reference to examples, comparative examples and experimental data.
Examples 1 to 3 and comparative examples 1 to 2
A preparation method of a PC-ABS electromagnetic shielding composite material comprises the following steps:
(1) According to the material formula, the material comprises the following components in percentage by mass: 20% -40% of Polycarbonate (PC); 10 to 30 percent of acrylonitrile-butadiene-styrene (ABS); 1% -10% of maleic anhydride grafted carbon nano-tube; 1% -10% of graphene oxide; 0.1 to 1 percent of auxiliary agent, and accurately weighing each component;
the formulations of the examples and comparative examples are shown in the following table:
example 1 | Example 2 | Example 3 | Comparative example 1 | Comparative example 2 | |
PC resin | 57.50% | 55.00% | 50.00% | 50.00% | 50.00% |
ABS resin | 30.00% | 32.50% | 37.50% | 37.50% | 37.50% |
Maleic anhydride grafted carbon nanotubes | 10.00% | 8.00% | 6.00% | 12.00% | / |
Graphene oxide | 2.00% | 4.00% | 6.00% | / | 12.00% |
Auxiliary agent | 0.50% | 0.50% | 0.50% | 0.50% | 0.50% |
(2) Sequentially pouring the dried PC resin and ABS resin into a stirring barrel, premixing the materials for 3-5 min, and uniformly mixing to obtain an initial mixture;
(3) Pouring the initial mixture, the maleic anhydride grafted carbon nanotube, the graphene oxide and the auxiliary agent which are weighed according to the formula into the stirring barrel again for mixing for the second time, wherein the mixing time is 3-5 min, and mixing uniformly to obtain a secondary mixed material;
(4) And (3) putting the secondary mixed material into a main feeding hopper of a double-screw extruder, heating and melting, extruding and granulating to finally obtain the PC/ABS composite material.
Examples of the experiments
The PC-ABS electromagnetic shielding composite materials prepared in examples 1-3 and comparative examples 1-2 were subjected to performance tests, and the test results are shown in the following table.
Example 1 | Example 2 | Example 3 | Comparative example 1 | Comparative example 2 | |
Shielding effectiveness SE/dB | 72 | 75 | 77 | 61 | 59 |
As can be seen from the performance comparison tests in the above table, compared with comparative examples 1 to 2, the PC/ABS electromagnetic shielding composite material prepared in examples 1 to 3 of the present invention can improve absorption loss and multiple reflection attenuation by performing surface modification on the carbon nanotube, and the polarization loss of the electromagnetic wave can be increased by the functional group and defect contained in the surface of the graphene oxide. By optimizing the dosage, the form, the modification, the dispersion and the like of the carbon-based composite conductive nano filler, a conductive path is increased, the conductivity is obviously increased, the synergistic effect is exerted, and the electromagnetic wave loss capability of the PC/ABS electromagnetic shielding composite material is effectively improved.
One or more technical solutions in the embodiments of the present invention at least have the following technical effects or advantages:
the composite material provided by the embodiment of the invention comprises the following raw materials: the modified carbon nano tube is a maleic anhydride grafted carbon nano tube, the hollow structure of the carbon nano tube can increase the dissipation path of electromagnetic waves and enhance the interface polarization effect, and the dispersibility of the carbon nano tube can be improved and the surface contact resistance can be reduced by introducing the graphene and combining the graphene by covalent C-C bonds. The graphene/carbon nanotube multilayer structure is beneficial to enhancing the polarization effect of the composite material, increasing the dielectric loss way and effectively improving the electromagnetic wave loss capability. The PC/ABS electromagnetic shielding composite material prepared by mixing the conductor-insulator core-shell type nanometer conductive filler taking the carbon nanotube as the core and the maleic anhydride as the shell with the compounded graphene oxide nanometer filler with the modified surface and the PC/ABS base material has excellent dielectric property and good processability.
Finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all changes and modifications that fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. The PC-ABS electromagnetic shielding composite material is characterized by comprising the following raw materials: polycarbonate, acrylonitrile-butadiene-styrene, a modified carbon nano tube and an auxiliary agent, wherein the modified carbon nano tube is a maleic anhydride grafted carbon nano tube.
2. The PC-ABS electromagnetic shielding composite material of claim 1, wherein the raw materials of the composite material further comprise: and (3) oxidizing the graphene.
3. The PC-ABS electromagnetic shielding composite material of claim 2, wherein the raw materials of the composite material comprise, in mass fraction:
20-40% of polycarbonate, 10-30% of acrylonitrile-butadiene-styrene, 1-10% of modified carbon nanotube, 1-5% of graphene oxide and 0.1-1% of auxiliary agent.
4. The PC-ABS electromagnetic shielding composite material according to claim 2 or 3, wherein the raw materials of the composite material comprise, in mass fraction:
25-35% of polycarbonate, 15-25% of acrylonitrile-butadiene-styrene, 3-8% of modified carbon nanotube, 2-4% of graphene oxide and 0.3-0.7% of auxiliary agent.
5. The PC-ABS electromagnetic shielding composite of claim 1, wherein the auxiliary agent comprises: a toughening agent and an antioxidant.
6. A method for preparing a PC-ABS electromagnetic shielding composite material as claimed in any one of claims 1 to 5, wherein the method comprises:
premixing polycarbonate and acrylonitrile-butadiene-styrene to obtain an initial mixture;
mixing the rest raw materials and the initial mixture for the second time to obtain a secondary mixed material;
and heating, melting, extruding and granulating the secondary mixed material to obtain the PC-ABS electromagnetic shielding composite material.
7. The method for preparing a PC-ABS electromagnetic shielding composite material according to claim 6, wherein the temperature for heating and melting is 220-250 ℃.
8. The method for preparing a PC-ABS electro-magnetic shielding composite of claim 6, further comprising drying the polycarbonate and the acrylonitrile-butadiene-styrene.
9. The method for preparing PBT/PET alloy material of GWIT according to claim 8, wherein the drying temperature is 80-100 ℃, and the drying time is 2-4h.
10. An electronic device housing, characterized in that the housing is made of the PC-ABS electromagnetic shielding composite material as claimed in any one of claims 1 to 5.
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CN116396659A (en) * | 2023-03-22 | 2023-07-07 | 西北工业大学 | Modified carbon nano tube-epoxy resin wave-absorbing coating and preparation process |
CN116396659B (en) * | 2023-03-22 | 2024-02-13 | 西北工业大学 | Modified carbon nano tube-epoxy resin wave-absorbing coating and preparation process |
CN118374137A (en) * | 2024-05-16 | 2024-07-23 | 广东信隆新材料股份有限公司 | Novel PC/ABS alloy and preparation method and application thereof |
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