Polypropylene resin blend and preparing method thereof

Abstract

The invention discloses a polypropylene resin blend, which is prepared with polypropylene, polyethylene, vinyl co-polymer rubber, talcum powder, polypropylene and anti-oxidant. Compared to the existing technology, the polypropylene resin blend has excellent balance of rigidity and toughness, the low temperature notch impact strength is greatly higher than the general polypropylene composite materials, the crystallization rate is fast and crystal form is controllable, the period of injection molding is short, and there is no tiger skin veins on the surface of the injection molding articles, the heat resisting and oxidation susceptibility is excellent, can be processed in the higher molding temperature (higher than 240 Celsius system), therefore the adjusting range of this technology is large, and can be recovered many times. The blend is especially suitable for preparing instrument board of ensconcing safety airbag, the tensile strength of the blend is more than 20MPa, bend strength is more than 30MPa, the IZOD notch impact strength is more than 15KJ / m2 at the temperature of subzero 30 Celsius system.

Description

technical field [0001] The invention relates to the technical field of polypropylene resin, in particular to a polypropylene resin blend and a preparation method thereof. Background technique [0002] The passenger side of the car dashboard is usually equipped with an airbag. In order not to affect the integrity of the appearance of the dashboard, more and more models are equipped with hidden airbags. Generally, the airbag cover is integrated with the dashboard. A specific area of ​​the instrument panel skin is pre-weakened to form easy-to-tear nicks. When the airbag bursts, the pressure of the airbag deployment causes the pre-weakened nicks on the instrument panel to tear, and the airbag pops up and deploys to protect passengers. When the airbag explodes, if the toughness of the material is insufficient, the weakened area will often produce sharp fractures and even flying debris or broken particles, which may cause the airbag to be scratched and cause injury to the occupant...

AI Technical Summary

Problems solved by technology

[0008] From the above analysis, it can be seen that conventional modified polypropylene materials have the defect of insufficient low-temperature toughness, and in order to achieve a certain low-temperature toughness, a large amount of rubber can be added, but this will lead to a decrease in the heat distortion temperature and rigidity of the material, and injection molding Sometimes the appearance defect of stripes (tiger skin pattern) will appear on the surface, which cannot meet the appearance requirements

Images