Polypropylene thermoplastic elastomer for automobile safety airbag cover board and preparation method thereof

Abstract

The invention discloses a polypropylene thermoplastic elastomer for an automobile safety airbag cover board; the polypropylene thermoplastic elastomer comprises 21-48% of high melt strength polypropylene (HMSPP), 10-50% of olefin polymer, 10-40% of styrenic thermoplastic elastomer and 2-15% of compatilizer by weight; a preparation method of the polypropylene thermoplastic elastomer comprises the steps as follows: adding the above components to a double-screw extruder respectively according to a proportion, melting, mixing and dispersing, setting a temperature of each section of the extruder at 230-265 DEG C, extruding and granulating to obtain the product finally. As the high melt strength polypropylene (HMSPP) is adopted as a matrix resin of the thermoplastic elastomer, and the olefin polymer and the styrenic thermoplastic elastomer are used for toughening synergistically, the prepared elastomer material has excellent high temperature and low temperature bursting properties and can meet the requirements that the automobile safety airbag cover board cannot be deformed to fly out and torn excessively during high temperature blasting (85 DEG C.) and does not generate fragments during low temperature blasting (-35 DEG C.); and therefore, the polypropylene thermoplastic elastomer can replace the conventional thermoplastic polyolefin (TPO) to apply to different types of automobile safety airbag cover boards.

Description

technical field [0001] The invention belongs to the field of polymer materials and their molding processing, and in particular relates to a polypropylene thermoplastic elastomer for automobile airbag cover plates and a preparation method thereof. Background technique [0002] Automobile airbag cover is a decorative and functional automotive interior part. In the event of a traffic accident, the airbag is deployed in an emergency and penetrates the airbag cover. Therefore, the airbag cover not only needs to ensure sufficient toughness at extremely low temperatures (-35°C), so that debris cannot fly out and hurt people when the airbag penetrates and tears the cover; ) to ensure a certain degree of rigidity, and it is not allowed to deform due to insufficient high-temperature rigidity or excessive tearing due to too low high-temperature tear strength, resulting in major accidents. [0003] At present, the airbag cover on the car mainly uses polyolefin thermoplastic elastomer (...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the defects of insufficient high-temperature rigidity and tear strength of polyolefin thermoplastic elastomer (TPO) materials, the primary purpose of the present invention is to provide a material with excellent rigidity and tear strength under high temperature conditions and excellent low temperature Polypropylene thermoplastic elastomers for automotive airbag covers with toughness properties