Polypropylene composition for spray-free bumpers and preparation method thereof

Abstract

The invention discloses a polypropylene composition for spray-free bumpers and a preparation method thereof. The polypropylene composition comprises the following components in percentage by weight: 20-60% of copolymer polypropylene resin, 10-40% of homopolymer polypropylene resin, 10-20% of toughener, 1-4% of antiaging system aid, 1-5% of scratch-resistant agent, 0.1-0.5% of nucleator, 0.5-3% of lubricant, 0.2-0.5% of coupling agent, 1-15% of high-polymer antistatic agent and 1-3% of master batch. The spray-free bumper prepared from the composition has the advantages of favorable washability, favorable permanent antistatic property, favorable long-term aging resistance and low dependence on the environment. The preparation method comprises the following steps: (1) weighing the materials in percentage by weight; (2) stirring and mixing the raw materials to obtain a premix; and (3) carrying out extrusion granulation on the premix to obtain the polypropylene composition. The method has the advantages of simple production technique and low cost.

Description

technical field [0001] The invention relates to the technical field of material chemistry, in particular to a polypropylene composition for a spray-free bumper and a preparation method thereof. Background technique [0002] With the continuous development of automobile lightweight requirements, polypropylene composite materials with many advantages such as low cost, good comprehensive mechanical properties, non-toxic, light weight, corrosion resistance, good electrical properties, easy processing, and easy recycling are widely used in Production of auto parts, among which auto bumpers are the most representative parts. Nowadays, the development trend of bumper requires not only protective function, but also decorative function, which should be harmonious and unified with the shape of the car body. The spraying of automobile bumpers can meet the increasingly colorful decorative needs of the automobile industry for bumpers. At the same time, the paint can protect the bumper b...

AI Technical Summary

Problems solved by technology

[0005] (1) Since the spray-free bumper has no paint film protection, in addition to directly facing the hazards of external acid rain, ultraviolet rays, and oxides, there are also the hazards of metal impurities in the internal metal toner that have a catalytic aging effect, and the bumper is prone to mechanical damage. Serious performance degradation, short service life and other issues

[0006] (2) Since polypropylene is a non-polar material with strong insulation, the surface is easy to accumulate charges, which makes the surface of the bumper body easy to absorb dust; at the same time, excessive static electricity accumulation will also cause some dangerous accidents. Use environment and service life, the low-molecular antistatic agent used in the prior art has poor washing resistance, and the antistatic effect can be greatly reduced by car washing and raining, resulting in poor antistatic durability. The mechanism of action is to absorb air moisture to form a conductive water film, and its antistatic performance is also highly dependent on the ambient humidity

[0007] (3) Since the existing production line of the main engine factory is still mainly assembled after spraying, the bumper in this process has two shrinkages, namely, the cooling shrinkage after injection molding of the material and the shrinkage during the baking and painting process. The latter shrinkage is more difficult to control and fluctuates more Large, while the spray-free bumper only undergoes cooling shrinkage after injection molding, it is difficult to meet the assembly requirements under the same conditions, so the shrinkage rate of the material needs to be controlled

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