High-performance polypropylene thin-wall bumper material without needle eye defects and preparation method thereof

Abstract

The invention discloses a high-performance polypropylene thin-wall bumper material without needle eye defects and a preparation method thereof. The modified polypropylene composite material comprisesthe following components in percentage by weight: 40-90% of polypropylene, 5-15% of an elastomer, 0-30% of an inorganic filler, 1-3% of color master batch, 0.5-3% of a dispersing agent, 0.05-5% of anorganic light stabilizer, 0.1-1.5% of an antioxidant and 0-2% of other assistants. The preparation method comprises the steps: firstly, uniformly stirring the elastomer, the inorganic filler, the color master batch, the dispersing agent and the special polypropylene at a high speed, blending and extruding a strip-shaped blend through double screws, cooling through circulating water, and granulating in a granulator to obtain the modified polypropylene particles. The polypropylene with good fluidity and high viscosity at a high shearing rate is selected, so the polypropylene can well infiltratethe toner, and the transfer of the shearing action between materials is stronger due to the high viscosity, and thus the toner can be dispersed more uniformly. Therefore, needle eye defects can be reduced. And a small amount of dispersing agent is added, so that the risk of needle eyes can be avoided.

Description

technical field [0001] The invention relates to a high-performance polypropylene thin-wall bumper material without pinhole defects; the invention also provides a preparation method of a high-performance polypropylene thin-wall bumper material without pinhole defects. Background technique [0002] With the continuous development of the automobile industry and the further improvement of the global requirements for energy saving and emission reduction, the thin-walled design of parts has become an important development trend. As a bumper part with a large amount of automotive exterior decoration, it is very important to design a thin-walled bumper. Thin-walled bumpers can reduce the amount of materials used, thereby achieving the purpose of reducing body weight and saving resources. [0003] Some bumpers will be fully painted. Generally, this kind of bumper only needs to be made into ordinary black color. Therefore, when producing polypropylene, only a small amount of black ma...

AI Technical Summary

Problems solved by technology

If there are pits on the surface of the bumper during molding, similar to pinhole defects, it will greatly increase the defect rate of the bumper after painting, and may have a certain impact on the adhesion of the paint film

Especially when the masterbatch content increases, the defect rate of pinhole defects will further increase

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