Stress whitening resistant low-VOC (Volatile Organic Compounds) low-linear-expansion-coefficient polypropylene material

Abstract

The invention provides a stress whitening resistant low-VOC (Volatile Organic Compounds) low-linear-expansion-coefficient polypropylene material. The stress whitening resistant low-VOC low-linear-expansion-coefficient polypropylene material is prepared from the following raw materials 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 polyethylene, 2 to 5 parts of smell adsorbent, 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-VOC low-linear-expansion-coefficient polypropylene material, 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, the linear expansion coefficient and smell of the material are lowered on the basis of keeping other physical properties, and the size stability of the material is improved.

Description

technical field [0001] The invention belongs to the field of modified polypropylene materials, in particular to a stress-whitening-resistant, low-VOC, and low-linear-expansion-coefficient polypropylene material, which is anti-stress-whitening, low-VOC, and low-linear-expansion-coefficient polypropylene material. 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 occ...

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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 Resistance to stress whitening effect, but the mechanical properties are not ideal

[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 CN104558842A discloses a low linear expansion coefficient bumper material and its preparation method. By adding styrene-based elastomers without double bonds, the linear expansion coefficient is reduced and the dimensional stability of the material is improved. However, due to the styrene-based With the addition of elastomer, the smell of the material cannot be guaranteed, and the cost is high

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