High fusion bonding strength glass fiber reinforced polypropylene composite material and preparation method thereof

Abstract

The invention relates to a high fusion mark strength glass fiber reinforced polypropylene composite material which comprises the following components in parts by weight: 100 parts of polypropylene, 0.1-2 parts of sulfonated polyolefin wax, 1-10 parts of maleic anhydride grafted polypropylene and 1-50 parts of glass fiber. Due to addition of the sulfonated polyolefin wax and the maleic anhydride grafted polypropylene in compounding of glass fiber reinforced polypropylene, the sulfonated polyolefin wax is enriched at a front flowing end in injection molding, therefore, strong polar groups of a high density are formed at a weld mark, the intermolecular interactions at the weld mark can be greatly improved, and thus the strength of the weld mark of the glass fiber reinforced polypropylene canbe improved.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a glass fiber reinforced polypropylene composite material with high weld line strength and a preparation method thereof. Background technique [0002] After reinforced with glass fiber, polypropylene can greatly improve its strength, rigidity, impact strength and heat distortion temperature, so it is widely used in automobiles, building materials, home appliances and other industries. However, in the application process, it is often found that the position of the weld line of the reinforced polypropylene injection molded part becomes the failure initiation point of the part. This is because although the addition of glass fiber can greatly improve the strength of the material, it is difficult to improve the strength of the weld line. In general, the strength of glass fiber-reinforced weld lines is not higher than that of matrix resin, which is mainly due to the poor com...

AI Technical Summary

Problems solved by technology

Both of the above two patent applications use chlorosulfonated polyethylene, which plays the role of toughening and improving impact strength. It is a high molecular weight substance, and its molecular weight is much higher than that of sulfonated polyolefin wax. Although chlorosulfonated polyethylene Polyethylene has polar groups and can also increase the polarity in composite materials, but because of its high molecular weight, the increase in polarity is very limited

Therefore, the improvement of the weld line strength by chlorosulfonated polyethylene is very limited, and it can only improve the toughness and impact strength