Stress whitening resistant low-temperature impact resistant polypropylene material and preparation method thereof

Abstract

The invention provides a stress whitening resistant low-temperature impact resistant polypropylene material and a preparation method thereof. The stress whitening resistant low-temperature impact resistant polypropylene material is prepared from the following components in parts by weight: 40 to 70 parts of polypropylene resin mixture, 5 to 30 parts of filling powder, 5 to 15 parts of toughening agent, 1 to 10 parts of polypropylene, 1 to 2 parts of toner, 0.2 to 0.4 part of primary antioxidant and 0.2 to 0.4 part of auxiliary antioxidant. In the stress whitening resistant low-temperature impact resistant polypropylene material and the preparation method thereof, random copolymerization polypropylene is taken as a substrate, so that the anti-bending stress whitening performance of the material is enhanced remarkably; the toughening agent and the polyethylene are added, so that the stress whitening resistance is enhanced, and the low-temperature impact resistance of the material is improved on the basis of keeping other physical properties; meanwhile, a small quantity of auxiliary components are added, so that the color matching capability of the material is not influenced; moreover, the preparation method is easy to implement, and has wide applicability.

Description

technical field [0001] The invention belongs to the field of modified polypropylene materials and production methods thereof, in particular to a stress-whitening-resistant and low-temperature impact-resistant polypropylene material and a preparation method thereof. Background technique [0002] In recent years, with the continuous development and growth of the automobile industry, the use of passenger car plastics is increasing, the technical level of plastic modification is increasing, and there are more and more requirements for the performance and appearance of automotive plastics, especially PP modified materials. , is getting higher and higher, especially in the appearance parts of the interior and exterior of the car, such as door panels, instrument panels, pillars, etc. These parts will have relatively concentrated stress during the production injection molding, transportation, assembly and use. Whitening is prone to occur at stress concentration parts, that is, stres...

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Problems solved by technology

[0004] Patent CN101058655A discloses a filling modified polypropylene with resistance to stress whitening and stress cracking and its production method and application. By using talcum powder and calcium carbonate as a filling modifier, the blending of homopolymerized PP and copolymerized PP guarantees The effect of stress whitening resistance, but the mechanical properties are not ideal, and the low temperature impact performance is poor

[0005] Patent CN102863697A discloses a stress-whitening-resistant modified polypropylene and its preparation method. The stress-whitening phenomenon is reduced by adding titanium dioxide and other components, but it is not suitable for many colors due to the addition of more titanium dioxide.

[0006] Patent CN103242586A discloses a low-temperature impact-resistant, low-stress whitening long glass fiber reinforced polypropylene material and its preparation method and application. By adding low-temperature impact-resistant, low-stress whitening masterbatches, the low-temperature impact characteristics of the product are improved and the reduction in Stress whitening occurs, but because it is a glass fiber reinforced product, it has unique performance and appearance, and many parts are not suitable

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