A kind of high temperature resistant boiled polypropylene composite material and preparation method thereof

Abstract

The invention provides a high-temperature-resistant boiled polypropylene composite material and a preparation method thereof. The composite material is made of the following raw materials by weight: 20-70 parts of metallocene polypropylene (mPP), 10-40 parts of high-crystalline polypropylene , 5-20 parts of crystalline POE, 5-25 parts of mineral powder, 0.8-1.5 parts of carbon black masterbatch, 0.1-0.6 parts of antioxidant, 0.1-0.2 parts of lubricant, and 0.1-0.2 parts of acid scavenger. The high-temperature-resistant boiled polypropylene composite material of the present invention adopts the method of blending mPP with a rather narrow molecular weight distribution and a small amount of high-crystallization PP (between 47-50%) to obtain a compound with high fluidity, narrow molecular weight distribution, and high crystallinity. The blended PP with the characteristics of low molecular weight content, low content of small molecular weight and low metallocene catalyst residue is used as the new PP matrix of the present invention, and other components and additives are added in the same way.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a high temperature resistant boiling polypropylene composite material and a preparation method thereof. Background technique [0002] The polypropylene composite material for automobile exterior parts is mainly made of automobile bumper body, grille, wheel eyebrow, side beam, etc. by injection molding, and the finished product is obtained by spraying primer, topcoat and varnish. These painted exterior parts often encounter water (such as muddy water, rainwater, dew, etc.), and as a result, the phenomenon of loss of gloss, peeling, wrinkling and blistering occurs. Therefore, the high temperature boiling test of substrates and coatings is an important indicator for evaluating painted parts. The current effective coating test methods for high temperature boiling resistance are as follows: 23°C water immersion (240h) test method at room temperature, 40°C water immersion ...

AI Technical Summary

Problems solved by technology

When testing the base material of the same painted part, the last test method is the method of soaking in boiling water at 99 °C for 4 hours. The test conditions are the most severe, and the failure phenomenon is the most likely to occur. It is the most difficult to pass the high temperature boiling test of the painted parts.

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