High-rigid ultra-tough laser-weldable polypropylene modified material and preparation method thereof

Abstract

The invention relates to a high-rigid ultra-tough laser-weldable polypropylene modified material and a preparation method thereof. Raw materials of the modified material comprise the following components: copolymerized polypropylene, a toughening agent, whiskers, a transparent agent, an antioxidant, a light stabilizer and a lubricant. The polypropylene material provided by the invention can meet requirements of laser welding, and performance of the polypropylene material is much better than performance of prior polypropylene materials suitable for laser welding. The polypropylene material hasvery good high toughness and low linear expansion coefficient, breaks through the performance bottleneck of existing products, and greatly widens the application field of laser welding technology in plastic parts of automobiles.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, in particular to a high-rigidity and super-toughness laser-weldable polypropylene modified material and a preparation method thereof. Background technique [0002] At present, in the automotive industry, there are mainly the following methods for bonding plastic parts: glue bonding, hot plate welding, and ultrasonic welding. Among them, there are volatile organic compounds in glue bonding, which affects the physical and mental health of operators; hot plate welding is affected by construction, and some parts with more complicated structures are not suitable for use; ultrasonic welding is the main means of linking parts such as bumpers and radar brackets. The wall thickness of the bumper is gradually reduced, and this welding method will appear a certain degree of welding marks on the front of the bumper, which will affect the appearance of the part. [0003] Laser welding technology is...

AI Technical Summary

Problems solved by technology

[0004] Previously reported laser welding polypropylene materials are non-filled polypropylene materials or glass fiber reinforced polypropylene materials. The laser transmittance can meet the requirements of laser welding, but the performance is relatively limited and cannot meet the rigidity requirements of many automotive parts. , toughness and dimensional stability requirements, which greatly limit the application of laser welding technology in the field of automotive interior and exterior decoration, while conventional talcum powder modified materials have a good balance of rigidity and toughness, but poor light transmittance, It cannot meet the requirements of laser welding, so it is necessary to develop a polypropylene composite material with high rigidity, super toughness, low linear expansion coefficient and good near-infrared laser transparency to achieve laser welding in the bonding of automotive interior and exterior parts wide range of applications

Images