Polypropylene composite material and preparation method thereof

Abstract

The invention discloses a polypropylene composite material, which mainly comprises the following components in parts by weight: 100 parts of a polypropylene resin, 0.5-15 parts of one or more of styrene / methacrylic acid furfuryl alcohol ester copolymer and fluorine-containing polyacrylate, wherein the polypropylene resin has wide number-average molecular weight distribution, and based on the totalmass of the polypropylene, the number-average molecular weight distribution of more than 98wt% of the polypropylene in the polypropylene resin is within the range of 300000-500000. According to the invention, the technical defect that a workpiece is prone to stress whitening in the production and transportation process can be overcome.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a polypropylene composite material and a preparation method thereof. Background technique [0002] With the continuous improvement of the demand for lightweight vehicles, polypropylene (PP) materials are widely used in automotive parts, including bumpers, side skirts, wheel eyebrows, etc., due to their low specific gravity, excellent mechanical properties, low cost, and easy processing. Automotive exterior trim. With the development of the automobile industry, OEMs have increasingly stringent requirements for automotive exterior materials, especially for paint-free exterior parts, which must not have any defects that affect the appearance. However, during the injection molding and transportation of automotive parts , It will cause stress whitening defects, and about 5% of the scrap parts will bring direct economic losses to the enterprise. [0003] The prior art mainl...

AI Technical Summary

Problems solved by technology

The above method can solve the stress whitening defect in the injection molding process to a certain extent, but this method reduces the injection molding efficiency and reduces the production capacity

The current solution to the scrapped parts caused by bumps during transportation is to use cotton materials to wrap the parts, which is time-consuming and laborious, and scrapped parts will still be generated

[0004] Nowadays, there are also many reports mainly focusing on formula modification: patent 201810783219.1 introduces a method of adding anti-stress whitening agent to solve stress whitening. The anti-stress whitening agent is mainly tin dioxide, titanium dioxide and polyethylene wax, mainly from the color masking The angle is solved, but it can't solve the stress whitening permanently, and can't achieve the expected anti-whitening effect

Patent CN105440433A introduces a method of adjusting the ratio of homopolypropylene and copolymerized polypropylene to prepare a polypropylene material that resists stress whitening, but the ability to solve stress whitening is limited, and the performance of the material itself deteriorates

Patent CN103881233A introduces a polypropylene-nylon composition to improve impact whitening, which can effectively solve impact whitening, but the compatibility between polypropylene and nylon is poor, and the mechanical properties of polypropylene-nylon composition deteriorate

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