Conductive polypropylene composition and preparation method thereof

Abstract

The invention discloses a conductive polypropylene composition and a preparation method thereof. The conductive polypropylene composition comprises the following components in parts by weight: 30-70 parts of polypropylene resin A, 2-20 parts of polypropylene resin B and 15-30 parts of conductive carbon black. The melt mass flow rate of the polypropylene resin A is 1-100 g / 10 min at 230 DEG C underthe load of 2.16 kg according to the ISO1133-2-2011 standard. The polypropylene resin B is ultra-high fluidity polypropylene resin, and the melt mass flow rate of the polypropylene resin B is 1000-2000 g / 10 min at 230 DEG C under the load of 2.16 kg according to the ISO1133-2-2011 standard. The oil absorption value of the conductive carbon black is greater than 120m<3> / 100g according to ASTM D3493-2016 test. According to the invention, the ultrahigh-fluidity polypropylene resin is added as a dispersing component, so that the dispersity of the conductive carbon black in a polypropylene systemis effectively improved, and the conductivity and mechanical properties of the polypropylene material are improved.

Description

Technical field [0001] The present invention relates to the field of polymer materials, and more particularly to a conductive polypropylene composition and a preparation method thereof. Background technique [0002] In the future, automatic cruise (ACC), anti-collision system (CA), and variant assisting system, etc., will use millimeter wave radar, and with the development of technology, 77GHz millimeter Poerada will be universally industrialized in the automotive industry. Instead of 24 GHz millimeters, the mainstream of the car millimeter wave radar is reached, and in this case, the anti-interference of radar is very important. [0003] Polypropylene (PP) is used as a cost-effective general plastic, which has excellent mechanical properties, chemical, high heat resistance, etc. after modification, and is widely used in automotive products. However, polypropylene has problems that cannot be electrically conductive and cannot meet the needs of automotive inside and outer accessor...

AI Technical Summary

Problems solved by technology

Adding a dispersant is a more conventional means of modification to solve the dispersion problem of conductive carbon black. Conventional dispersants include oligomers, such as PP wax, PE wax, etc., and additives with lower molecular weights such as EBS and stearate. However, due to its low molecular weight, the addition of these additives in the formula should not be too high, otherwise it will seriously affect the mechanical properties of the material, and there is a risk of precipitation and stickiness. At the same time, compared with other polar resins, polypropylene is more It is not easy to achieve conductivity, so there are relatively few reports on conductive polypropylene products on the market. Therefore, it is still necessary to develop a simple and feasible preparation process in this field, which has good conductivity and is suitable for the interior and exterior of automobiles that require electromagnetic shielding. piece of polypropylene material

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