A kind of conductive polypropylene composition and preparation method thereof

Abstract

The invention discloses a conductive polypropylene composition and a preparation method thereof. The conductive polypropylene composition includes 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 polypropylene resin A according to According to the ISO1133-2-2011 standard, at 230°C and under a load of 2.16kg, the melt mass flow rate is 1-100g / 10min; the polypropylene resin B is an ultra-high fluidity polypropylene resin, according to ISO1133-2-2011 Standard, at 230°C, 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> 120cm 3 / 100g. The invention effectively improves the dispersibility of the conductive carbon black in the polypropylene system by adding the ultra-high fluidity polypropylene resin as a dispersion component, and improves the electrical conductivity and mechanical properties of the polypropylene material.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a conductive polypropylene composition and a preparation method thereof. Background technique [0002] In the future of automatic driving technology of automobiles, automatic cruise control (ACC), collision avoidance system (CA) and lane change assistance system will use millimeter-wave radar in large quantities, and with the development of technology, 77GHz millimeter-wave radar will be widely industrialized in the automotive industry And replace 24GHz millimeter-wave radar to become the mainstream of automotive millimeter-wave radar applications. In this case, the anti-jamming of radar is particularly important. [0003] 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. However, polyprop...

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

Images