WO2024061004A1 - 一种各向同性电磁屏蔽聚丙烯复合材料及其制备和应用 - Google Patents

一种各向同性电磁屏蔽聚丙烯复合材料及其制备和应用 Download PDF

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WO2024061004A1
WO2024061004A1 PCT/CN2023/117423 CN2023117423W WO2024061004A1 WO 2024061004 A1 WO2024061004 A1 WO 2024061004A1 CN 2023117423 W CN2023117423 W CN 2023117423W WO 2024061004 A1 WO2024061004 A1 WO 2024061004A1
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composite material
polypropylene
polypropylene composite
electromagnetic shielding
carbon black
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PCT/CN2023/117423
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English (en)
French (fr)
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赖昂
何浏炜
程文超
付伟
陈瑶
陈胜杰
熊值
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武汉金发科技有限公司
武汉金发科技企业技术中心有限公司
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Publication of WO2024061004A1 publication Critical patent/WO2024061004A1/zh

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/10—Homopolymers or copolymers of propene
    • C08L23/12—Polypropene
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K9/00—Screening of apparatus or components against electric or magnetic fields
    • H05K9/0073—Shielding materials
    • H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
    • H05K9/0083—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising electro-conductive non-fibrous particles embedded in an electrically insulating supporting structure, e.g. powder, flakes, whiskers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00—Specific properties of additives
    • C08K2201/001—Conductive additives
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00—Adapting or protecting infrastructure or their operation

Definitions

  • the invention belongs to the field of polymer materials, and particularly relates to an isotropic electromagnetic shielding polypropylene composite material and its preparation and application.
  • polypropylene As the lowest-density general-purpose polymer material, polypropylene is widely used in automobiles, home appliances and other industries. Polypropylene composite materials with electromagnetic shielding functions will have specific application prospects in automotive radar brackets, household appliances and other fields. Current research on the modification of electromagnetic shielding of polypropylene composite materials is mainly achieved by adding some conductive fillers, such as graphene, carbon black, carbon nanotubes, carbon fibers and conductive metal powders.
  • Two-dimensional and one-dimensional conductive fillers such as graphene, carbon nanotubes, carbon fibers, etc., have better conductive effects, but they are ineffective in reducing costs and have anisotropic defects; the most commonly used three-dimensional conductive filler is conductive carbon black, which The conductive effect is not as good as that of carbon nanotubes. In current research, a very high amount of addition is needed to achieve better electromagnetic shielding effect, but it has a greater impact on mechanical properties.
  • the technical problem to be solved by the present invention is to provide an isotropic electromagnetic shielding polypropylene composite material and its preparation and application.
  • the invention provides an isotropic electromagnetic shielding polypropylene composite material, which includes components in parts by weight:
  • the melt mass flow rate ratio of polypropylene and polyethylene is 0.2 to 0.5;
  • the test conditions for the melt mass flow rate of polypropylene are 230°C and 2.16kg; the melt mass flow rate of polyethylene is
  • the rate test conditions are 190°C, 2.16kg, and the test standard is ISO 1133-2001.
  • melt index ratio of polypropylene and polyethylene When the melt index ratio of polypropylene and polyethylene is 0.2-0.5, a bicontinuous structure is easily formed.
  • the melt index of polyethylene is higher than that of polypropylene, and carbon black is easily dispersed in polyethylene.
  • the continuous structure of the carbon black-enriched polyethylene phase in the system forms a conductive path, which greatly improves the anti-electromagnetic shielding effect.
  • the oil absorption value of the conductive carbon black is 120-180m 3 /100g, and the oil absorption value is tested in accordance with ASTM D3493-2016.
  • the oil absorption value can indicate the degree of aggregation of carbon black.
  • the lower the oil absorption value the lower the structure of carbon black, which is not conducive to the formation of conductive paths.
  • the oil absorption value is too high, the degree of aggregation and structure will be high, and a shape similar to a "one-dimensional" rod-like material will be formed. , leading to anisotropy.
  • the melt mass flow rate ratio of polypropylene and polyethylene is 0.3-0.4.
  • the conductive carbon black has an oil absorption value of 120-140m 3 /100g and an oil absorption value of 160-180m 3 /100g and is compounded according to a mass ratio of 0.8-1.2:1.
  • the conductive carbon black having an oil absorption value of 120-140 m 3 /100 g and the conductive carbon black having an oil absorption value of 160-180 m 3 /100 g are compounded in a mass ratio of 1:1.
  • the lubricant is one or more of polypropylene wax, polyethylene wax, and ethylene bisstearamide stearate.
  • the antioxidant is one or more of phenols, amines, phosphites, semi-hindered phenols, complexes of acryl functional groups and thioesters, and calixarenes.
  • the filler is one or more of talc, calcium carbonate, whiskers, and wollastonite.
  • the components include, in parts by weight:
  • the preparation method of the polypropylene composite material of the present invention includes:
  • the isotropic electromagnetic shielding polypropylene composite material of the present invention is used in the field of electromagnetic shielding materials, such as in vehicle-mounted radar brackets, household appliances, etc.
  • the interfacial free energy of polyethylene/conductive carbon black is 2.2mJ/m 2
  • the interfacial free energy of polypropylene/conductive carbon black is 4.1mJ/m 2
  • the present invention selects a matrix combination with a polypropylene/polyethylene melt index ratio of 0.2-0.5, introduces polyethylene into the polypropylene, and carbon black will preferentially fill the polyethylene phase with smaller interfacial free energy and higher melt index, which is rich in
  • the polyethylene phase of carbon black particles is distributed in a continuous form in the polypropylene matrix, and the polyethylene conductive areas overlap each other to form a conductive continuous structure; a small amount of carbon black particles dispersed in the continuous phase of polypropylene can also form a large number of micro-conductive networks.
  • the two form a double percolation effect, which greatly reduces the carbon black content required for the system to achieve electromagnetic shielding (>30dB) and reduces the loss of carbon black on the mechanical properties of composite materials.
  • the present invention selects carbon black with an oil absorption value of 120-180m 3 /100g, which can not only ensure that the carbon black efficiently forms a conductive network, but also avoid anisotropy caused by an excessively high structure of the carbon black; at the same time, it uses Two types of carbon black with higher oil absorption value (120-140m 3 /100g) and lower oil absorption value (160-180m 3 /100g) are compounded to take into account conductive efficiency and homogeneity.
  • the polypropylene composite material of the present invention has good electromagnetic shielding effect (>30dB), and simultaneously achieves isotropic electromagnetic shielding effect and good notch impact strength.
  • melt mass flow rate 10g/10min 3 ;
  • the melt mass flow rate is 15g/10min 3 at 230°C and 2.16kg;
  • melt mass flow rate is 2g/10min 3 ;
  • melt mass flow rate 20g/10min 3 ;
  • Conductive carbon black-1 tested according to ASTM D3493-2016, oil absorption value: 150m 3 /100g, manufacturer: Bora
  • Conductive carbon black-2 tested according to ASTM D3493-2016, oil absorption value: 170m 3 /100g, manufacturer: Bora
  • Conductive carbon black-4, oil absorption value: 130m 3 /100g and oil absorption value: 170m 3 /100g are mixed at a mass ratio of 1:1.
  • Conductive carbon black-5, oil absorption value: 120m 3 /100g and oil absorption value: 180m 3 /100g are mixed at a mass ratio of 1:1.
  • Conductive carbon black-6, oil absorption value: 140m 3 /100g and oil absorption value: 170m 3 /100g are mixed at a mass ratio of 1:1.
  • Conductive carbon black-7, oil absorption value: 170m 3 /100g and oil absorption value: 180m 3 /100g are mixed at a mass ratio of 1:1.
  • Conductive carbon black-8, oil absorption value: 120m 3 /100g and oil absorption value: 140m 3 /100g are mixed at a mass ratio of 1:1.
  • Conductive carbon black-9, oil absorption value: 120m 3 /100g and oil absorption value: 150m 3 /100g are mixed at a mass ratio of 1:1.
  • Conductive carbon black -10, oil absorption value: 150m 3 /100g and oil absorption value: 170m 3 /100g are mixed at a mass ratio of 1:1.
  • Conductive carbon black-11 tested according to ASTM D3493-2016, oil absorption value: 200m 3 /100g, manufacturer: Bora
  • Conductive carbon black-12 tested according to ASTM D3493-2016, oil absorption value: 100m 3 /100g, manufacturer: Bora
  • Lubricant polyethylene wax, commercially available
  • Antioxidant 1010 and antioxidant 168 are compounded at a ratio of 1:1.
  • the feeding port is put into a twin-screw extruder, and the polypropylene composite material is obtained through melt extrusion, drawing, water cooling, and granulation; the length-to-diameter ratio of the twin-screw extruder is 40:1-75:1.
  • the extrusion temperature is 200-240°C
  • the screw speed is 300-1000rpm
  • the total feeding volume is 100 ⁇ 1200kg/h
  • the vacuum degree is ⁇ -0.08bar.
  • Shielding effectiveness SE test the shielding characteristics of the 3mm injection molded sample according to the GJB 8820-2015 standard "Measurement Method for Shielding Effectiveness of Electromagnetic Shielding Materials";
  • Table 1 shows the proportions (parts by weight) and performance of the examples
  • Table 2 shows the proportions (parts by weight) and performance of the examples
  • the embodiments of the present invention all achieve better electromagnetic shielding effect (>30dB), while achieving isotropic electromagnetic shielding effect (shielding effectiveness ratio in different directions is not less than 0.9), and at the same time have good notched impact strength (30KJ/m 2 above).

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
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  • Compositions Of Macromolecular Compounds (AREA)

Abstract

本发明涉及一种各向同性电磁屏蔽聚丙烯复合材料及其制备和应用，组分包括聚丙烯、聚乙烯、导电炭黑、润滑剂、抗氧剂、填料。本发明的聚丙烯复合材料具有较好的电磁屏蔽效果(＞30dB)，同时实现各向同性电磁屏蔽效果。

Description

一种各向同性电磁屏蔽聚丙烯复合材料及其制备和应用 技术领域
本发明属于高分子材料领域，特别涉及一种各向同性电磁屏蔽聚丙烯复合材料及其制备和应用。
背景技术
近年来，各类无线通讯和网络系统、工业用电子设备以及家用电器等的高速发展，射频设备的功率逐渐提高，电磁辐射正充斥我们的生活空间。但是，伴随着电磁辐射应用的负面效应，电磁干扰已成为一种新的社会公害。一方面，EMI会影响电子设备的工作稳定性，降低使用寿命，甚至会威胁通信系统的安全，造成信息泄露；另一方面，长时间的电磁干扰会损害人体健康，影响神经、免疫、内分泌系统等，还会损害遗传效应。
聚丙烯作为密度最低的通用高分子材料，被广泛应用于汽车、家电等行业中，拥有电磁屏蔽功能的聚丙烯复合材料在车载雷达支架、家用电器等领域将拥有具体的应用前景。目前对于聚丙烯复合材料电磁屏蔽的改性研究，主要是通过添加一些导电填料，如石墨烯、炭黑、碳纳米管、碳纤维和可导电金属粉等实现。二维和一维导电填料，如石墨烯、碳纳米管、碳纤维等导电效果较好，但是其对降低成本无效，且存在各向异性的缺陷；三维导电填料较常用的是导电炭黑，其导电效果不如碳纳米管，在目前的研究中需要添加量非常之高才能达到较好电磁屏蔽效果，但是对机械性能影响较大。
发明内容
针对现有技术的缺陷，本发明所要解决的技术问题是提供一种各向同性电磁屏蔽聚丙烯复合材料及其制备和应用。
本发明提供一种各向同性电磁屏蔽聚丙烯复合材料，按重量份数组分包括：
其中聚丙烯和聚乙烯的熔体质量流动速率比为0.2～0.5；
其中聚丙烯的熔体质量流动速率测试条件为230℃、2.16kg；聚乙烯的熔体质量流动速
率测试条件为190℃、2.16kg，测试标准为ISO 1133-2001。
聚丙烯和聚乙烯熔指比为0.2-0.5时容易形成双连续结构，聚乙烯熔指较聚丙烯高，炭黑易分散在聚乙烯中，富集炭黑的聚乙烯相在体系中的连续结构形成导电通路，大大提升抗电磁屏蔽的功效。
所述导电炭黑的吸油值为120-180m3/100g，吸油值按照ASTM D3493-2016测试。
吸油值可表征炭黑的聚集程度，吸油值越低炭黑的结构度低，对形成导电通路不利；但是吸油值过高，聚集程度和结构度高，会形成类似“一维”棒状材料形状，导致各向异性。
优选地，所述聚丙烯和聚乙烯的熔体质量流动速率比为0.3-0.4。
优选地，所述导电炭黑为吸油值为120-140m3/100g和吸油值为160-180m3/100g按照质量比为0.8-1.2:1进行复配。
进一步优选地，所述所述导电炭黑为吸油值为120-140m3/100g和吸油值为160-180m3/100g按照质量比为1:1进行复配。
优选地，所述润滑剂为聚丙烯蜡、聚乙烯蜡、乙撑双硬脂酰胺硬脂酸盐中的一种或几种。
优选地，所述抗氧剂为酚类、胺类、亚磷酸酯类、半受阻酚类、丙烯酰基官能团与硫代酯的复合物类、杯芳烃中的一种或几种。
优选地，所述填料为滑石粉、碳酸钙、晶须、硅灰石中的一种或几种。
优选地，所述按重量份数，组分包括：
本发明的一种所述聚丙烯复合材料的制备方法，包括：
按配比称取各组分，将聚丙烯、聚乙烯、填料、抗氧剂、润滑剂，混合后从主喂料口投入双螺杆挤出机中，将导电炭黑从侧喂料口中投入双螺杆挤出机，经熔融挤出、拉条、水冷、造粒，干燥，得到聚丙烯复合材料。
本发明的一种所述各向同性电磁屏蔽聚丙烯复合材料在电磁屏蔽材料领域中的应用，如在车载雷达支架、家用电器等。
聚乙烯/导电炭黑界面自由能为2.2mJ/m2，聚丙烯/导电炭黑的界面自由能为4.1mJ/m2， 本发明选取聚丙烯/聚乙烯熔指比为0.2-0.5的基体组合，在聚丙烯中引入聚乙烯，炭黑会优先填充界面自由能更小且熔指更高的聚乙烯相中，富含炭黑粒子的聚乙烯相以连续形态分布在聚丙烯基体中，聚乙烯导电区相互搭接形成导电连续结构；少量分散在聚丙烯连续相中的炭黑粒子也能形成大量的微导电网络，两者形成双逾渗效应，大大降低体系达到电磁屏蔽(＞30dB)要求的炭黑含量，降低炭黑对复合材料机械物性的损失。
另外，本发明选择吸油值为120-180m3/100g的炭黑，既能保证炭黑高效的形成导电网络的，又能避免因炭黑的结构度过高而导致的各向异性；同时用较高吸油值(120-140m3/100g)和较低吸油值(160-180m3/100g)两种炭黑进行复配，更加兼顾导电效率和各项同性。
有益效果
本发明的聚丙烯复合材料具有较好的电磁屏蔽效果(＞30dB)，同时实现各向同性电磁屏蔽效果和较好的缺口冲击强度。
具体实施方式
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。
一、原料来源：
聚丙烯：
聚丙烯-1，PP QP81N，厂家：齐鲁石化。在230℃、2.16kg条件下熔体质量流动速率为20g/10min3；
聚丙烯-2，PP 300M，厂家：中海壳牌。在230℃、2.16kg条件下熔体质量流动速率为10g/10min3；
聚丙烯-3，PP YPJ-1215C，厂家：扬子石化。在230℃、2.16kg条件下熔体质量流动速率为15g/10min3；
聚丙烯-4，PP EP300H，厂家：中海壳牌。在230℃、2.16kg条件下熔体质量流动速率为2g/10min3；
聚乙烯：
聚乙烯-1，DNDA-7144，厂家：陶氏。在190℃、2.16kg条件下熔体质量流动速率为 20g/10min3；
聚乙烯-2，LLDPE 2650，厂家：天津石化。在190℃、2.16kg条件下熔体质量流动速率为50g/10min3；
上述聚丙烯和聚乙烯的熔体质量流动速率的测试标准均为ISO 1133-2001。
导电炭黑：
导电炭黑-1：根据ASTM D3493-2016测试，吸油值：150m3/100g，厂家：博拉
导电炭黑-2：根据ASTM D3493-2016测试，吸油值：170m3/100g，厂家：博拉
导电炭黑-3，根据ASTM D3493-2016测试，吸油值：130m3/100g，厂家：博拉
导电炭黑-4，吸油值：130m3/100g和吸油值：170m3/100g按质量比为1:1混合。
导电炭黑-5，吸油值：120m3/100g和吸油值：180m3/100g按质量比为1:1混合。
导电炭黑-6，吸油值：140m3/100g和吸油值：170m3/100g按质量比为1:1混合。
导电炭黑-7，吸油值：170m3/100g和吸油值：180m3/100g按质量比为1:1混合。
导电炭黑-8，吸油值：120m3/100g和吸油值：140m3/100g按质量比为1:1混合。
导电炭黑-9，吸油值：120m3/100g和吸油值：150m3/100g按质量比为1:1混合。
导电炭黑-10，吸油值：150m3/100g和吸油值：170m3/100g按质量比为1:1混合。
导电炭黑-11：根据ASTM D3493-2016测试，吸油值：200m3/100g，厂家：博拉
导电炭黑-12：根据ASTM D3493-2016测试，吸油值：100m3/100g，厂家：博拉
根据ASTM D3493-2016测试，吸油值120m3/100g、140m3/100g、180m3/100g的厂家：博拉。
填料：滑石粉，市售；
润滑剂：聚乙烯蜡，市售；
抗氧剂：抗氧剂1010和抗氧剂168按照1:1复配。
平行实施例和对比例中的填料、润滑剂、抗氧剂使用同一市售产品。
二、实施例1-17和对比例1-5的制备方法：
按照配比将聚丙烯、聚乙烯、润滑剂和抗氧剂在高速混合机中混合3-5min；将以上混合物从主喂料口投入双螺杆挤出机中，按照配比将炭黑从侧喂料口投入双螺杆挤出机中，经熔融挤出、拉条、水冷、造粒得聚丙烯复合材料；其中所述的双螺杆挤出机的长径比为40:1—75:1，挤出温度为200-240℃，螺杆转速为300-1000rpm，总喂料量为100～1200kg/h，真空度≤-0.08bar。
四、性能测试：
(1)屏蔽效能SE；根据GJB 8820-2015标准《电磁屏蔽材料屏蔽效能测量方法》测试3mm注塑样板的屏蔽特性；
(2)不同方向屏蔽效能比：流动方向屏蔽效能与垂直流动方向屏蔽效能的比值，比值越接近1，代表各项同向，比值越小，代表各项异性；
(3)23℃缺口冲击强度：按ISO 180：2000测试。
表1为实施例的配比(重量份)和性能

表2为实施例的配比(重量份)和性能
表3对比例1-5配比(重量份)和性能
实施例1、2、3和对比例1、2可知，聚丙烯与聚乙烯的熔指比在0.2-0.5区间内时电磁屏蔽效能和各项同性效果优异，此时PP和PE为双连续结构且PE熔指高，炭黑更倾向富集在PE相中，形成PE导电网络；而熔指比超出此范围，无法形成有效导电网络，电磁屏蔽效能大大降低；
实施例1、4、5和对比例3、4可知，炭黑的吸油值在120-180m3/100g时电磁屏蔽效能和各项同性效果较好，低于120时(对比例4)炭黑结构度不够，对电磁屏蔽效能提升不明显；当吸油值高于180m3/100g时(对比例3)，炭黑结构度太高导致复合材料各项异性差；实施例10、11、12复配120-140m3/100g和160-180m3/100g吸油值炭黑，电磁屏蔽效能和各项同性效果最佳。
实施例1-17和对比例5可知，用普通方案改性的炭黑填充聚丙烯材料(对比例5)，体系中炭黑含量即使达到25份，也无法实现电磁屏蔽大于30dB的效果且对材料韧性损害极大，而使用特定熔指比的PP/PE复合体系中最低加入9份的炭黑也能实现较好的电磁屏蔽效果。
本发明实施例均达到了较好的电磁屏蔽效果(＞30dB)，同时实现各向同性电磁屏蔽效果(不同方向屏蔽效能比不小于0.9)，同时具有较好的缺口冲击强度(30KJ/m2以上)。

Claims (9)

  1. 一种各向同性电磁屏蔽聚丙烯复合材料，其特征在于，按重量份数组分包括：
    其中聚丙烯和聚乙烯的熔体质量流动速率比为0.2～0.5；
    所述导电炭黑的吸油值为120-180m3/100g。
  2. 根据权利要求1所述聚丙烯复合材料，其特征在于，所述聚丙烯和聚乙烯的熔体质量流动速率比为0.3-0.4。
  3. 根据权利要求1所述聚丙烯复合材料，其特征在于，所述导电炭黑为吸油值为120-140m3/100g和吸油值为160-180m3/100g按照质量比为0.8-1.2：1复配。
  4. 根据权利要求1所述聚丙烯复合材料，其特征在于，所述润滑剂为聚丙烯蜡、聚乙烯蜡、乙撑双硬脂酰胺硬脂酸盐中的一种或几种。
  5. 根据权利要求1所述聚丙烯复合材料，其特征在于，所述抗氧剂为酚类、胺类、亚磷酸酯类、半受阻酚类、丙烯酰基官能团与硫代酯的复合物类、杯芳烃中的一种或几种。
  6. 根据权利要求1所述聚丙烯复合材料，其特征在于，所述填料为滑石粉、碳酸钙、晶须、硅灰石中的一种或几种。
  7. 根据权利要求1所述聚丙烯复合材料，其特征在于，所述按重量份数组分包括：
  8. 一种权利要求1所述各向同性电磁屏蔽聚丙烯复合材料的制备方法，包括：
    按配比称取各组分，将聚丙烯、聚乙烯、填料、抗氧剂、润滑剂，混合后从主喂料口投入双螺杆挤出机中，将导电炭黑从侧喂料口中投入双螺杆挤出机，经熔融挤出、拉条、水冷、造粒，干燥，得到聚丙烯复合材料。
  9. 一种权利要求1所述各向同性电磁屏蔽聚丙烯复合材料在电磁屏蔽材料领域中的应用。
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