WO2022110655A1 - 导电聚丙烯组合物及其制备方法 - Google Patents

导电聚丙烯组合物及其制备方法 Download PDF

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WO2022110655A1
WO2022110655A1 PCT/CN2021/092733 CN2021092733W WO2022110655A1 WO 2022110655 A1 WO2022110655 A1 WO 2022110655A1 CN 2021092733 W CN2021092733 W CN 2021092733W WO 2022110655 A1 WO2022110655 A1 WO 2022110655A1
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polypropylene
conductive
parts
polypropylene resin
polypropylene composition
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French (fr)
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卢朝亮
叶南飚
黄险波
杨波
吴亦建
苏娟霞
罗忠富
陈延安
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Kingfa Science and Technology Co Ltd
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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
    • C08L23/14—Copolymers of propene
    • 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
    • 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
    • C08K2201/002—Physical properties
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group

Definitions

  • the invention relates to the technical field of polymer materials, in particular to a conductive polypropylene composition and a preparation method thereof.
  • Millimeter-wave radar will be widely used in automatic cruise (ACC), collision avoidance system (CA) and lane-change assist system in the future of automotive automated driving technology, and with the development of technology, 77GHz millimeter-wave radar will be widely industrialized in the automotive industry And replace the 24GHz millimeter-wave radar to become the mainstream of automotive millimeter-wave radar applications. In this case, the anti-jamming of the radar is particularly important.
  • ACC automatic cruise
  • CA collision avoidance system
  • lane-change assist system in the future of automotive automated driving technology
  • 77GHz millimeter-wave radar will be widely industrialized in the automotive industry And replace the 24GHz millimeter-wave radar to become the mainstream of automotive millimeter-wave radar applications.
  • the anti-jamming of the radar is particularly important.
  • polypropylene As a cost-effective general-purpose plastic, polypropylene (PP) has the characteristics of excellent mechanical properties, chemical resistance, and high heat resistance after modification, and is widely used in automotive products.
  • polypropylene has the problem of inability to conduct electricity, and cannot meet the needs of automotive interior and exterior trims with electromagnetic signal shielding requirements.
  • CN 110951164 A, CN 104877232 A and CN 109867859 A disclose some technical solutions for realizing electrical conductivity of polypropylene materials, wherein CN 110951164 A adopts micro-foaming technology to improve the electrical conductivity of materials, but it is well known that the use of micro-foaming technology It will lead to a significant decrease in the physical properties of the material, which limits its popularization and use to a certain extent; CN 104877232 A uses modified carbonized bacterial cellulose nanomaterials to realize the electrical conductivity of polypropylene materials.
  • MWCNTs multi-walled carbon nanotubes
  • MOFs metal-organic framework material
  • CN 109867859 A uses metal-organic framework material MOFs as main conductive filler and one of graphene, carbon black, carbon nanotube, carbon fiber and conductive metal powder as auxiliary conductive filler, and improves the conductivity of the material by compounding performance, but its solution currently only achieves antistatic grades, not conductive grades.
  • conductive carbon black As the most common conductive filler, conductive carbon black has the advantage of being low in price and harmless to the human body, so it is often selected as an antistatic material and a conductive material.
  • the addition amount When the addition amount is often very high, usually the addition amount needs to be 5-10 times that of carbon nanotubes to achieve the conductivity of the material. Under such a high amount of conductive carbon black, the dispersion of conductive carbon black will affect the conductivity of the material. The biggest problem is the performance and appearance and performance of the product.
  • the addition of dispersants is a more conventional modification method to solve the problem of conductive carbon black dispersion.
  • Conventional dispersants include oligomers, such as PP wax, PE wax, etc., and additives with lower molecular weights such as EBS and stearate.
  • polypropylene is more It is not easy to achieve electrical conductivity, so there are relatively few reports on conductive polypropylene products on the market at present, so there is still a need to develop a simple and feasible preparation process in the field, which has good electrical conductivity, and is suitable for the interior and exterior of automobiles with electromagnetic shielding requirements. Pieces of polypropylene material.
  • the purpose of the present invention is to overcome the shortcomings of the prior art and provide a conductive polypropylene composition with low surface resistance.
  • a conductive polypropylene composition in parts by weight, comprising the following components: 30-70 parts of polypropylene resin A, 2-20 parts of polypropylene resin B and 15-30 parts of conductive carbon black;
  • the polypropylene resin A has a melt mass flow rate of 1-100g/10min at 230°C and a load of 2.16kg;
  • the polypropylene resin B is an ultra-high fluidity polypropylene resin. According to the ISO1133-2-2011 standard, at 230° C. and under a load of 2.16kg, its melt mass flow rate is 1000-2000g/10min;
  • the conductive carbon black is tested according to ASTM D3493-2016, and its oil absorption value is >120 m 3 /100 g.
  • the invention effectively improves the dispersibility of the conductive carbon black in the polypropylene system by selecting the ultra-high-fluidity polypropylene resin as the dispersing component, so that the conductivity of the prepared polypropylene material is improved, and the surface resistance is in the range of 10 4 -10 2 within the ⁇ /sq range.
  • the impact properties and flexural modulus of the material have increased to a certain extent.
  • ultra-high fluidity polypropylene compared with small molecular weight dispersants such as PP wax and EBS, ultra-high fluidity polypropylene has higher compatibility with the matrix resin, which can effectively solve the problem of precipitation and stickiness caused by the incompatibility of additives. It is precisely due to the improvement of compatibility that the mechanical properties of the material can be greatly improved when ultra-high-flow polypropylene is used to replace PP wax and small molecular weight dispersants such as EBS.
  • the addition amount of ultra-high-fluidity polypropylene resin is too low, the effect of improving the dispersibility of conductive carbon black in the polypropylene system is not obvious; Therefore, the addition amount of the ultra-high-fluidity polypropylene resin in the present invention is 2-20 parts by weight.
  • carbon black with too low oil absorption value is not conducive to improving the conductivity of the material, so the present invention selects conductive carbon black with oil absorption value>120m 3 /100g.
  • the weight part of the polypropylene resin B is 5-10 parts.
  • the electrical conductivity and mechanical properties of the prepared polypropylene composition are good.
  • the polypropylene resin A is at least one of homopolypropylene and copolymer polypropylene; the ultra-high-fluidity polypropylene resin is homopolypropylene.
  • the polypropylene resin A has a melt mass flow rate of 10-100g/10min at 230°C and a load of 2.16kg, which can further improve the electrical conductivity, impact strength and Flexural modulus.
  • the conductive polypropylene composition further includes the following components in parts by weight: 10-30 parts of filler, the filler including at least one of talc, calcium carbonate, barium sulfate, and glass fiber.
  • the conductive polypropylene composition further includes the following components in parts by weight: 0.1-3 parts of an auxiliary agent, and the auxiliary agent includes at least one of an antioxidant and a light stabilizer.
  • the antioxidant is at least one of hindered phenolic antioxidants and phosphite antioxidants; the hindered phenolic antioxidants include at least one of antioxidants 1010, 1076, and 3114
  • the phosphite type antioxidant includes at least one of antioxidant 168 and PEP-36.
  • the light stabilizer is a hindered amine light stabilizer
  • the hindered amine light stabilizer includes at least one of UV-3808PP5, LA-402XP, and LA-402AF.
  • the present invention also provides a method for preparing the above conductive polypropylene composition.
  • the polypropylene resin A, the polypropylene resin B, the filler, the conductive carbon black and the auxiliary agents are mixed uniformly and then added to a twin-screw extruder for melting and kneading.
  • the temperature of melt-kneading is 200-210° C.
  • the rotational speed of the screw is 350-450 rev/min
  • the conductive polypropylene composition is obtained by extrusion and granulation.
  • the present invention also provides the application of the above polypropylene composition in the interior and exterior trim parts of automobiles with electromagnetic signal shielding function.
  • the production method of the invention is simple and convenient to implement, has cost advantages, and the prepared polypropylene composition has very high electrical conductivity, and is suitable as an EMI material to be applied to the interior and exterior trim parts of automobiles with EMI characteristic requirements.
  • the present invention can effectively improve the dispersibility of the conductive carbon black in the polypropylene system by selecting the ultra-high-fluidity polypropylene resin as the dispersing component, so that the conductivity of the prepared polypropylene material is improved, and its surface resistance is at 10 4 - within the range of 10 2 ⁇ /sq.
  • the impact properties and flexural modulus of polypropylene materials also increased to a certain extent.
  • ultra-high fluidity polypropylene has higher compatibility with the matrix, which can solve the problem of precipitation and stickiness caused by the incompatibility of small molecular weight dispersants and the matrix. , and greatly improve the mechanical properties of the material;
  • the polypropylene composition of the present invention has the advantages of simple and convenient production method, low production cost and high electrical conductivity, and is suitable as an EMI material to be applied to the interior and exterior trim parts of automobiles with EMI characteristic requirements.
  • the experimental methods used are conventional methods unless otherwise specified, and the materials, reagents, etc. used can be obtained from commercial sources unless otherwise specified.
  • PP resin 1 According to the ISO1133-2-2011 standard, the melt mass flow rate at 230°C and 2.16kg load is 40g/10min, Sinopec Maoming, copolymerized polypropylene;
  • PP resin 2 According to the ISO1133-2-2011 standard, the melt mass flow rate at 230°C and 2.16kg load is 2g/10min, CNOOC Shell, copolymerized polypropylene;
  • Ultra-high fluidity PP resin 1# homopolypropylene, according to ISO1133-2-2011 standard, the melt mass flow rate at 230°C and 2.16kg load is 1400g/10min;
  • Ultra-high fluidity PP resin 2# homopolypropylene, according to ISO1133-2-2011 standard, the melt mass flow rate at 230°C and 2.16kg load is 1000g/10min;
  • Ultra-high fluidity PP resin 3# homopolypropylene, according to ISO1133-2-2011 standard, the melt mass flow rate at 230°C and 2.16kg load is 2000g/10min;
  • Ultra-high fluidity PP resin 4# homopolypropylene, according to ISO1133-2-2011 standard, the melt mass flow rate at 230°C and 2.16kg load is 500g/10min;
  • Ultra-high fluidity PP resin 5# homopolypropylene, according to ISO1133-2-2011 standard, the melt mass flow rate at 230°C and 2.16kg load is 3000g/10min;
  • the above-mentioned ultra-high-fluidity PP resin is prepared by adding different amounts of peroxides to degrade homopolypropylene with a melt mass flow rate of 20g/10min at 230°C and a load of 2.16kg.
  • Conductive carbon black 1 tested according to ASTM D3493-2016, oil absorption value 150m 3 /100g, Birla carbon black;
  • Conductive carbon black 2 tested according to ASTM D3493-2016, oil absorption value 110m 3 /100g, Birla carbon black;
  • Talc powder particle size 3000 mesh, Beihai Group
  • Antioxidants Antioxidant 1010 and Antioxidant 168, double bond chemical;
  • the components of the conductive polypropylene compositions of Examples 1-9 are shown in Table 1, and the components of the conductive polypropylene compositions of Comparative Examples 1-7 are shown in Table 2.
  • the preparation methods of the polypropylene compositions are as follows: : Mix the raw materials of each component evenly and then add them into the twin-screw extruder for melting and kneading. The melt-kneading temperature is 200-210°C, the screw speed is 350-450 rpm, and extruding and granulating to obtain polypropylene. combination.
  • polypropylene compositions prepared in the above examples and comparative examples were injection-molded into 100mm*100mm*2mm specimens and ISO standard mechanical specimens, and the following performance tests were carried out:
  • test standard for impact strength is ISO 527-1-2012;
  • the test for flexural modulus is denoted as ISO 178-2010.
  • the surface resistances of the polypropylene compositions of Examples 1 to 9 are all at the level of 10 4 to 10 2 ⁇ /sq, indicating that the present invention adopts the ultra-high fluidity polypropylene resin as the dispersant, which can greatly improve the performance of the conductive carbon black in the polymer.
  • the dispersibility in propylene enables the polypropylene material to achieve very good electrical conductivity.
  • the melt mass flow rate of polypropylene resin A also has a certain influence on the electrical conductivity, impact strength and flexural modulus of the polypropylene composition.
  • the polypropylene resin A of the present invention is preferably a polypropylene resin with a melt mass flow rate of 10-100 g/10min.
  • the melt mass flow rate of the ultra-high-fluidity polypropylene resin has high electrical conductivity when the melt mass flow rate is 1000-2000g/10min, and the mechanical properties of the material are at the same time.
  • the performance has been improved, but when the ultra-high flow polypropylene with the melt mass flow rate lower than 1000g/10min is used, the electrical conductivity of the material is not significantly improved, and the ultra-high flow rate of the melt mass flow rate higher than 2000g/10min is selected.
  • polypropylene resin although the electrical conductivity of the material is improved, the mechanical properties of the material are significantly reduced.
  • Example 1 Comparing the results of Example 1, Examples 7-8 and Comparative Examples 5-6, it is found that when the ultra-high fluidity polypropylene resin is used to replace the traditional PP wax and EBS as the dispersant, the obtained polypropylene material has better conductivity. properties and better mechanical properties.
  • Example 1 From the results of Example 1 and Comparative Example 7, it can be seen that the oil absorption value of carbon black is too low, which is not conducive to improving the conductivity of the material. Therefore, the present invention selects conductive carbon black with oil absorption value>120m 3 /100g.

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Abstract

一种导电聚丙烯组合物及其制备方法。所述导电聚丙烯组合物按重量份计，包括以下组分：聚丙烯树脂A30-70份、聚丙烯树脂B2-20份和导电炭黑15-30份；所述聚丙烯树脂A根据IS01133-2-2011标准，在230°C，2.16kg负荷下，其熔体质量流动速率为1〜100g/10min;所述聚丙烯树脂B为超高流动性聚丙烯树脂，根据IS01133-2-2011标准，在230°C，2.16kg负荷下，其熔体质量流动速率为1000〜2000g/10min;所述导电炭黑根据ASTMD3493-2016测试，其吸油值＞120m3/100g。通过添加超高流动性聚丙烯树脂作为分散组分，有效改善导电炭黑在聚丙烯体系中的分散性，提高聚丙烯材料的导电性和力学性能。

Description

一种导电聚丙烯组合物及其制备方法 技术领域
本发明涉及高分子材料技术领域，具体涉及一种导电聚丙烯组合物及其制备方法。
背景技术
未来的汽车自动化驾驶技术中自动巡航(ACC)、防撞系统(CA)以及变道辅助系统等将大量使用毫米波雷达，且随着技术的发展，77GHz毫米波雷达将在汽车行业普遍产业化并替代24GHz毫米波雷达成为汽车毫米波雷达应用的主流，在此情况下，雷达的抗干扰显得格外重要。
聚丙烯(PP)作为一种高性价比的通用塑料，通过改性后具有力学性能优良、耐化学、高耐热等特点，广泛应用于汽车产品。然而，聚丙烯具有不能导电的问题，无法满足具有电磁信号屏蔽要求的汽车内外饰件的使用需求。
为拓宽聚丙烯材料在导电方面的应用领域，现有技术针对聚丙烯的导电性开展大量的改性研究。CN 110951164 A、CN 104877232 A和CN 109867859 A公开了一些关于聚丙烯材料实现导电性的技术方案，其中CN 110951164 A采用了微发泡技术来改善材料的导电性，但众所周知，使用微发泡技术将导致材料各项物性都发生大幅度下降，一定程度上限制了其推广使用；CN 104877232 A则采用改性碳化细菌纤维素纳米材料来实现聚丙烯材料的导电，目前多壁碳纳米管(MWCNT)的工业化已经大幅度降低了原材料成本，采用碳化细菌纤维素不仅对降低成本无效，其所实现的导电性也远远低于MWCNT以及导电炭黑等工业化导电填料，同时其加工制备方式过于繁琐；CN 109867859 A采用金属-有机骨架材料MOFs作为主导电填料以及石墨烯、炭黑、碳纳米管、碳纤维和可导电金属粉等其中一种作为辅助导电填料，通过复配的方式提高材料的导电性能，但是其方案目前实现的仅是抗静电级，而非导电级。
导电炭黑作为最常见的导电填料，其优势在于价格低廉，对人体无害，所以常被选作为抗静电材料以及导电材料，但导电炭黑由于结构上的限制，其在实现材料的导电功能时，添加量往往非常之高，通常添加量需要达到碳纳米管 的5-10倍才能实现材料的导电，在如此高的导电炭黑添加量情况之下，导电炭黑的分散成为影响材料导电性以及制品外观及性能的最大问题。而添加分散剂是较为常规的解决导电炭黑分散问题的改性手段，常规的分散剂包括低聚物，例如PP蜡、PE蜡等，以及EBS、硬脂酸盐等分子量较低的添加剂，但其由于分子量过低，这些添加剂在配方中的添加量不宜过高，否则将严重影响材料的力学性能，同时存在析出发粘的风险，同时由于聚丙烯相比于其它极性树脂来说更不易实现导电性，所以目前市面上关于导电聚丙烯产品的报道相对较少，因此本领域尚需开发一种制备工艺简单可行，具有良好的导电性，同时适用于有电磁屏蔽需求的汽车内外饰件的聚丙烯材料。
发明内容
本发明的目的在于克服现有技术的不足之处而提供一种具有低表面电阻的导电聚丙烯组合物。
为实现上述目的，本发明采取的技术方案如下：
一种导电聚丙烯组合物，按重量份计，包括以下组分：聚丙烯树脂A30-70份、聚丙烯树脂B 2-20份和导电炭黑15-30份；
所述聚丙烯树脂A根据ISO1133-2-2011标准，在230℃，2.16kg负荷下，其熔体质量流动速率为1～100g/10min；
所述聚丙烯树脂B为超高流动性聚丙烯树脂，根据ISO1133-2-2011标准，在230℃，2.16kg负荷下，其熔体质量流动速率为1000～2000g/10min；
所述导电炭黑根据ASTM D3493-2016测试，其吸油值＞120m 3/100g。
本发明通过选用超高流动性聚丙烯树脂作为分散组分，有效改善导电炭黑在聚丙烯体系中的分散性，使得制备的聚丙烯材料的导电性提高，其表面电阻处于10 4-10 2Ω/sq范围之内。同时由于导电炭黑的分散性得到提升，材料的冲击性能以及弯曲模量具有一定程度的上升。此外，相比于PP蜡以及EBS等小分子量分散剂，超高流动性聚丙烯与基体树脂具有更高的相容性，可以有效解决由于助剂不相容而产生的析出发粘问题，也正是由于相容性的提高，当使用超高流动性聚丙烯替代PP蜡以及EBS等小分子量分散剂时，可以大幅度提高材料的力学性能。
超高流动性聚丙烯树脂的添加量过低，则改善导电炭黑在聚丙烯体系中的分散性效果不明显；超高流动性聚丙烯树脂的添加量过高，材料的导电性明显 降低，因此，本发明中超高流动性聚丙烯树脂的添加量为2-20重量份。
此外，吸油值过低的炭黑不利于提升材料的导电性，因此本发明选用吸油值＞120m 3/100g的导电炭黑。
进一步地，所述聚丙烯树脂B的重量份为5-10份。当聚丙烯树脂B的重量份为5-10份时，制备得到的聚丙烯组合物的导电性和力学性能较好。
进一步地，所述聚丙烯树脂A为均聚聚丙烯、共聚聚丙烯中的至少一种；所述超高流动性聚丙烯树脂为均聚聚丙烯。
进一步地，所述聚丙烯树脂A根据ISO1133-2-2011标准，在230℃，2.16kg负荷下，其熔体质量流动速率为10～100g/10min，能够进一步提高材料的导电性、冲击强度和弯曲模量。
进一步地，所述导电聚丙烯组合物按重量份计，还包括以下组分：填料10-30份，所述填料包括滑石粉、碳酸钙、硫酸钡、玻纤中的至少一种。
进一步地，所述导电聚丙烯组合物按重量份计，还包括以下组分：助剂0.1-3份，所述助剂包括抗氧剂、光稳定剂中的至少一种。
进一步地，所述抗氧剂为受阻酚类抗氧剂、亚磷酸酯类抗氧剂中的至少一种；所述受阻酚类抗氧剂包括抗氧剂1010、1076、3114中的至少一种，所述亚磷酸酯类抗氧剂包括抗氧剂168、PEP-36中的至少一种。
进一步地，所述光稳定剂为受阻胺类光稳定剂，受阻胺类光稳定剂包括UV-3808PP5、LA-402XP、LA-402AF中的至少一种。
本发明还提供了上述导电聚丙烯组合物的制备方法，将聚丙烯树脂A、聚丙烯树脂B、填料、导电炭黑及助剂混合均匀后加入双螺杆挤出机中，进行熔融混炼，熔融混炼的温度为200～210℃，螺杆转速为350～450转/分钟，挤出造粒，得到导电聚丙烯组合物。
本发明还提供了上述聚丙烯组合物在具有电磁信号屏蔽功能的汽车内外饰件中的应用。本发明的生产方法简单便于实行，具有成本优势，且制备得到的聚丙烯组合物具有非常高的导电性，适合作为EMI材料应用于具有EMI特性需求的汽车内外饰件。
与现有技术相比，本发明的有益效果为：
1)本发明通过选用超高流动性聚丙烯树脂作为分散组分，能够有效改善导电炭黑在聚丙烯体系中的分散性，使得制备的聚丙烯材料导电性提高，其表面 电阻处于10 4-10 2Ω/sq范围之内。同时由于导电炭黑的分散性得到提升，聚丙烯材料的冲击性能以及弯曲模量也具有一定程度的上升。此外，相比于PP蜡以及EBS等小分子量分散剂，超高流动性聚丙烯与基体具有更高的相容性，可以解决因小分子量分散剂与基体不相容而产生的析出发粘问题，并大幅度提高材料的力学性能；
2)本发明的聚丙烯组合物具有生产方法简单便于实行，生产成本低，导电性高的优势，适合作为EMI材料应用于具有EMI特性需求的汽车内外饰件。
具体实施方式
为更好地说明本发明的目的、技术方案和优点，下面将结合具体实施例对本发明进一步说明。本领域技术人员应当理解，此处所描述的具体实施例仅用以解释本发明，并不用于限定本发明。
实施例中，所使用的实验方法如无特殊说明，均为常规方法，所用的材料、试剂等，如无特殊说明，均可从商业途径得到。
实施例和对比例中用到的主要代表材料如下：
PP树脂1：根据ISO1133-2-2011标准，在230℃、2.16kg负荷下的熔体质量流动速率为40g/10min，中石化茂名，共聚聚丙烯；
PP树脂2：根据ISO1133-2-2011标准，在230℃、2.16kg负荷下的熔体质量流动速率为2g/10min，中海壳牌，共聚聚丙烯；
超高流动性PP树脂1#：均聚聚丙烯，根据ISO1133-2-2011标准，在230℃、2.16kg负荷下的熔体质量流动速率为1400g/10min；
超高流动性PP树脂2#：均聚聚丙烯，根据ISO1133-2-2011标准，在230℃、2.16kg负荷下的熔体质量流动速率为1000g/10min；
超高流动性PP树脂3#：均聚聚丙烯，根据ISO1133-2-2011标准，在230℃、2.16kg负荷下的熔体质量流动速率为2000g/10min；
超高流动性PP树脂4#：均聚聚丙烯，根据ISO1133-2-2011标准，在230℃、2.16kg负荷下的熔体质量流动速率为500g/10min；
超高流动性PP树脂5#：均聚聚丙烯，根据ISO1133-2-2011标准，在230℃、2.16kg负荷下的熔体质量流动速率为3000g/10min；
上述超高流动性PP树脂采用在230℃、2.16kg负荷下的熔体质量流动速率为20g/10min的均聚聚丙烯通过添加不同添加量的过氧化物进行降解的方法制 备得到。
导电炭黑1：根据ASTM D3493-2016测试，吸油值150m 3/100g，博拉炭黑；
导电炭黑2：根据ASTM D3493-2016测试，吸油值110m 3/100g，博拉炭黑；
滑石粉：粒径3000目，北海集团；
抗氧剂：抗氧剂1010和抗氧剂168，双键化工；
光稳定剂：UV-3808，BASF；
PP蜡：科莱恩；
EBS：韩国信元。
实施例1-9的导电聚丙烯组合物的组分如表1所示，对比例1-7的导电聚丙烯组合物的组分如表2所示，所述聚丙烯组合物的制备方法为：将各组分原料混合均匀后加入双螺杆挤出机中，进行熔融混炼，熔融混炼温度为200～210℃，螺杆转速为350～450转/分钟，挤出造粒，得到聚丙烯组合物。
将上述实施例和对比例制备的聚丙烯组合物注塑成100mm*100mm*2mm样片及ISO标准力学样条，进行如下性能测试：
按ASTM D4496-2013和D257-2014标准对材料的表面电阻进行测试；
冲击强度的测试标准为ISO 527-1-2012；
弯曲模量的测试表示为ISO 178-2010。
表1实施例1-9的聚丙烯组合物的配方及性能测试结果
Figure PCTCN2021092733-appb-000001
表2对比例1-7的聚丙烯组合物的配方及性能测试结果
Figure PCTCN2021092733-appb-000002
实施例1～9的聚丙烯组合物的表面电阻均处于10 4～10 2Ω/sq水平，说明本发明采用超高流动性聚丙烯树脂作为分散剂，可以很大程度改善导电炭黑在聚丙烯中的分散性，使得聚丙烯材料达到非常好的导电性。
由实施例1～4与对比例1～2的结果可知，当超高流动性聚丙烯树脂的重量份为2-20份时，尤其是5-10份时，制备得到的聚丙烯组合物兼具较好的导电性和力学性能。
由实施例1和实施例9结果可知，聚丙烯树脂A的熔体质量流动速率对于聚丙烯组合物的导电性、冲击强度和弯曲模量也有一定影响，为进一步地提高材料的导电性、冲击强度和弯曲模量，本发明的聚丙烯树脂A优选熔体质量流动速率为10～100g/10min的聚丙烯树脂。
由实施例1、实施例7～8与对比例3～4的结果可知，超高流动性聚丙烯树脂的熔体质量流动速率处于1000-2000g/10min时具有高的导电性，同时材料的力学性能有所改善，而使用熔体质量流动速率低于1000g/10min的超高流动性聚丙烯时，材料的导电性提升不明显，而选用熔体质量流动速率高于2000g/10min的超高流动性聚丙烯树脂时，虽然材料的导电性有所改善，但材料的力学性能 明显下降。
比较实施例1、实施例7～8与对比例5～6的结果发现，采用超高流动性聚丙烯树脂替代传统的PP蜡以及EBS作为分散剂时，得到的聚丙烯材料具备更优的导电性，同时力学性能更佳。
由实施例1和对比例7结果可知，炭黑的吸油值过低，不利于提升材料导电性，因此，本发明选用吸油值＞120m 3/100g的导电炭黑。
最后所应当说明的是，以上实施例仅用以说明本发明的技术方案而非对本发明保护范围的限制，尽管参照较佳实施例对本发明作了详细说明，本领域的普通技术人员应当理解，可以对本发明的技术方案进行修改或者等同替换，而不脱离本发明技术方案的实质和范围。

Claims (10)

  1. 一种导电聚丙烯组合物，其特征在于，按重量份计，包括以下组分：聚丙烯树脂A30-70份、聚丙烯树脂B 2-20份和导电炭黑15-30份；
    所述聚丙烯树脂A根据ISO1133-2-2011标准，在230℃，2.16kg负荷下，其熔体质量流动速率为1～100g/10min；
    所述聚丙烯树脂B为超高流动性聚丙烯树脂，根据ISO1133-2-2011标准，在230℃，2.16kg负荷下，其熔体质量流动速率为1000～2000g/10min；
    所述导电炭黑根据ASTM D3493-2016测试，其吸油值＞120m 3/100g。
  2. 如权利要求1所述的导电聚丙烯组合物，其特征在于，所述聚丙烯树脂B的重量份为5-10份。
  3. 如权利要求1所述的导电聚丙烯组合物，其特征在于，所述聚丙烯树脂A为均聚聚丙烯、共聚聚丙烯中的至少一种；所述超高流动性聚丙烯树脂为均聚聚丙烯。
  4. 如权利要求1所述的导电聚丙烯组合物，其特征在于，所述聚丙烯树脂A根据ISO1133-2-2011标准，在230℃，2.16kg负荷下，其熔体质量流动速率为10～100g/10min。
  5. 如权利要求1所述的导电聚丙烯组合物，其特征在于，按重量份计，还包括以下组分：填料10-30份，所述填料为滑石粉、碳酸钙、硫酸钡、玻纤中的至少一种。
  6. 如权利要求1所述的导电聚丙烯组合物，其特征在于，按重量份计，还包括以下组分：助剂0.1-3份，所述助剂为抗氧剂、光稳定剂中的至少一种。
  7. 如权利要求6所述的导电聚丙烯组合物，其特征在于，所述抗氧剂为受阻酚类抗氧剂、亚磷酸酯类抗氧剂中的至少一种。
  8. 如权利要求6所述的导电聚丙烯组合物，其特征在于，所述光稳定剂为受阻胺类光稳定剂。
  9. 权利要求1-8任一项所述的导电聚丙烯组合物的制备方法，其特征在于，将聚丙烯树脂A、聚丙烯树脂B、填料、导电炭黑及助剂混合均匀后加入双螺杆 挤出机中，进行熔融混炼，熔融混炼的温度为200～210℃，螺杆转速为350～450转/分钟，挤出造粒，得到导电聚丙烯组合物。
  10. 权利要求1-8任一项所述的导电聚丙烯组合物在具有电磁信号屏蔽功能的汽车内外饰件中的应用。
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