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CN-121991479-A - Polycarbonate composite material for microwave absorption and electromagnetic shielding and application thereof

CN121991479ACN 121991479 ACN121991479 ACN 121991479ACN-121991479-A

Abstract

The invention discloses a polycarbonate composite material for microwave absorption and electromagnetic shielding and application thereof. The composite material comprises, by mass, 45-65% of a polycarbonate matrix, 15-25% of an acrylonitrile-butadiene-styrene copolymer, 10-30% of carbon fibers, 1-5% of carbon black, 0.1-0.3% of an antioxidant and 1-3% of a processing aid, wherein the sum of the mass percentages of the components is 100%. The composite material prepared by the invention remarkably improves the absorption and shielding capacity of the composite material on electromagnetic waves in a microwave frequency range, and provides a new solution for light-weight and high-performance electromagnetic protective materials in the fields of 5G communication, automobile electronics, high-frequency electric appliances and the like.

Inventors

  • YU WENTAO
  • Sheng Yeming
  • WANG LULIN
  • LUO SHUILIANG
  • DENG JUEAN
  • HAO JIANXIN
  • SUO YANGYANG
  • ZHOU GUOQING

Assignees

  • 广州市聚赛龙工程塑料股份有限公司
  • 芜湖聚赛龙新材料科技有限公司

Dates

Publication Date
20260508
Application Date
20251229

Claims (10)

  1. 1. A polycarbonate composite material for microwave absorption and electromagnetic shielding is characterized by comprising the following components in percentage by mass, 45-65% Of polycarbonate matrix 15-25% Of acrylonitrile-butadiene-styrene copolymer 10-30% Of carbon fiber 1-5% Of carbon black 0.1 To 0.3 percent of antioxidant 1-3% Of processing aid The sum of the mass percentages of the components is 100 percent; the preparation method of the polycarbonate composite material for microwave absorption and electromagnetic shielding comprises the following specific steps: After premixing a polycarbonate matrix, an acrylonitrile-butadiene-styrene copolymer, carbon black, an antioxidant and a processing aid in a high-speed mixing mill, adding the mixture from a main feeding port of a double-screw extruder, carrying out melt blending, adding carbon fibers from a side feeding port, extruding the mixture through a machine head, bracing, cooling, granulating and drying to obtain the polycarbonate composite material for microwave absorption and electromagnetic shielding.
  2. 2. The polycarbonate composite material for microwave absorption and electromagnetic shielding according to claim 1, wherein the polycarbonate matrix has a melt mass flow rate of 10-25 g/10min.
  3. 3. The polycarbonate composite material for microwave absorption and electromagnetic shielding according to claim 2, wherein the polycarbonate matrix has a melt mass flow rate of 15-35 g/10min, the test standard is ASTM D-1238-2010, and the test conditions are 190 ℃ and 2.16 kg.
  4. 4. The polycarbonate composite material for microwave absorption and electromagnetic shielding according to claim 1, wherein the carbon fiber is at least one of a polyacrylonitrile-based carbon fiber, a viscose-filament carbon fiber, and an asphalt-filament carbon fiber.
  5. 5. The polycarbonate composite material for microwave absorption and electromagnetic shielding according to claim 1, wherein the carbon black has a particle size ranging from 0.5 to 3.5 μm and an oil absorption ranging from 80 to 130 cm 3 /10 g.
  6. 6. The polycarbonate composite for microwave absorption and electromagnetic shielding according to claim 1, wherein the antioxidant is at least one of n-stearyl β - (3, 5-di-t-butyl-4-hydroxyphenyl) propionate, tris [2, 4-di-t-butylphenyl ] phosphite, pentaerythritol tetrakis [ β - (3, 5-di-t-butyl-4-hydroxyphenyl) propionate, and dialkyl thiodipropionate.
  7. 7. The polycarbonate composite for microwave absorption and electromagnetic shielding according to claim 1, wherein the processing aid is at least one of a lubricant and a toughening agent.
  8. 8. The polycarbonate composite for microwave absorption and electromagnetic shielding according to claim 1, wherein the lubricant is stearate, calcium stearate or zinc stearate, and the toughening agent is at least one of acrylonitrile-butadiene-styrene copolymer high rubber powder, methyl methacrylate-butadiene-styrene terpolymer, and methyl methacrylate-acrylate-silicone terpolymer.
  9. 9. The polycarbonate composite material for microwave absorption and electromagnetic shielding according to claim 1, wherein the polycarbonate composite material for microwave absorption and electromagnetic shielding has a tensile strength of 80-120 MPa, an elongation of 3.0-4.0%, an impact strength of 5.5-7.5 kj/m2, a flexural strength of 130-180 MPa, and a flexural modulus of 8000-14000 MPa.
  10. 10. Use of a polycarbonate composite material for microwave absorption and electromagnetic shielding according to any one of claims 1 to 9 in an electronic appliance, a 5G communication antenna material or an automotive radome.

Description

Polycarbonate composite material for microwave absorption and electromagnetic shielding and application thereof Technical Field The invention belongs to the field of engineering plastic modification and electromagnetic wave absorption/shielding materials, and particularly relates to a Polycarbonate (PC) composite material for microwave absorption and electromagnetic shielding and application thereof. Background The fifth generation mobile communication technology (5G) has the characteristics of ultra-high density, ultra-high speed, ultra-low time delay, ultra-wide connection, ultra-high reliability, safety and the like. In recent years, with the popularization of 5G, a large number of electronic appliances are under high-frequency and high-speed operating conditions, and there is a higher demand for electromagnetic interference resistance and electromagnetic radiation prevention. The wave absorbing material is a material capable of converting incident electromagnetic waves into other energy, so that the electromagnetic waves are absorbed and shielded. Further development of higher electromagnetic losses, better formability, and lower cost wave absorbing materials are currently a need in the industry. The Polycarbonate (PC) is used as engineering plastic with the largest global consumption, has the characteristics of excellent rigidity and toughness balance performance, ultrahigh transparency, good dimensional stability and the like, and is widely applied to the fields of electronic appliances, automobiles, optical devices and the like. However, pure Polycarbonate (PC) itself has little absorption and shielding effect on electromagnetic waves, and it is difficult to satisfy application requirements in high-frequency electromagnetic environments. Therefore, how to provide a high-efficiency microwave absorption and electromagnetic shielding function on the basis of maintaining the excellent comprehensive performance of Polycarbonate (PC) becomes a research hot spot in the field. In the prior art, the carbon fiber has strong conductivity, can form an effective conductive network in a polymer matrix, is beneficial to the conduction of incident electromagnetic waves and can enhance the rigidity of the material. In the prior art, although there is a report of blending carbon fibers with a polymer matrix to improve the wave absorbing performance, a series of challenges are still faced in constructing a uniform and stable conductive network in a Polycarbonate (PC) matrix, and the key technical problems to be solved are still urgent at present in realizing efficient electromagnetic absorption in a wide frequency range and maintaining good processability and mechanical strength of the material. Disclosure of Invention To overcome the shortcomings and drawbacks of the prior art, a primary object of the present invention is to provide a polycarbonate composite for microwave absorption and electromagnetic shielding. A second object of the present invention is to provide the use of the polycarbonate composite material for microwave absorption and electromagnetic shielding described above. The primary purpose of the invention is realized by the following technical scheme: A Polycarbonate (PC) composite material for microwave absorption and electromagnetic shielding consists of the following components in percentage by mass, 45-65% Of Polycarbonate (PC) matrix 15-25% Of acrylonitrile-butadiene-styrene copolymer (ABS resin) 10-30% Of carbon fiber 1-5% Of carbon black 0.1 To 0.3 percent of antioxidant 1-3% Of processing aid The sum of the mass percentages of the components is 100 percent; The preparation method of the Polycarbonate (PC) composite material for microwave absorption and electromagnetic shielding comprises the following specific steps: After premixing a Polycarbonate (PC) matrix, an acrylonitrile-butadiene-styrene copolymer (ABS resin), carbon black, an antioxidant and a processing aid in a high-speed mixing mill, adding the mixture from a main feeding port of a double-screw extruder, carrying out melt blending, adding carbon fibers from a side feeding port separately, extruding the mixture through a machine head, bracing, cooling, granulating, and drying to obtain the Polycarbonate (PC) composite material for microwave absorption and electromagnetic shielding. Preferably, the melt mass flow rate of the Polycarbonate (PC) matrix is 10-25 g/10min, the test standard is ASTM D-1238-2010, and the test condition is 190 ℃ and 2.16 kg. Preferably, the mass flow rate of the Polycarbonate (PC) matrix melt is 15-35 g/10min. Preferably, the carbon fiber is at least one of a polyacrylonitrile-based carbon fiber, a viscose-based carbon fiber, and an asphalt-based carbon fiber. Preferably, the carbon black has a particle size ranging from 0.5 to 3.5 μm and an oil absorption value ranging from 80 to 130 cm 3/10 g. Preferably, the antioxidant is at least one of n-stearyl β - (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate (antio