Automobile wholly-plastic tail door outer plate material and preparation method thereof

Abstract

The invention relates to an automobile tailgate material and a preparation method thereof, in particular to an automobile all-plastic tailgate outer panel material and a preparation method thereof. The material of the present invention comprises the following components in parts by weight: 50-70 parts of polypropylene, 10-40 parts of reinforcement, 3-15 parts of toughening agent, 0.2-1 part of bridging agent, and 3-10 parts of compatibilizer , 0.2-0.5 parts of nucleating agent, 0.3-1 part of antioxidant, and 0.3-1 part of lubricant. The invention adopts low specific gravity and high strength organic fiber as polypropylene molecular chain motion inhibitor, limits the thermal expansion of polypropylene material, prepares high strength polypropylene material with low linear thermal expansion coefficient, and meets the requirements of automobile all-plastic tailgate material. At the same time, the weight of the car has been realized. In addition, the present invention has the characteristics of high flow, no floating fibers, high appearance, easy spraying, low warpage and rapid prototyping, which reduces the assembly and manufacturing costs of parts; it also has the characteristics of low odor and low VOC, which can effectively improve the interior air quality.

Description

technical field [0001] The invention relates to an automobile tailgate material and a preparation method thereof, in particular to an automobile all-plastic tailgate outer panel material and a preparation method thereof, belonging to the field of material technology. Background technique [0002] In recent years, car companies have made great progress in hybrid power systems, fuel cell vehicles, engine technology, and body weight reduction. Among them, the lightweight of automobiles is an area that car companies focus on. Modified plastics, as a material that can achieve both lightweight effects and reduce costs, have always been the preferred materials for many car companies in the exploration of lightweight. [0003] The implementation of Euro VI emissions in 2014, the carbon emission target for 2020 and even the carbon emission target for 2050 is a hurdle for major OEMs. In order to meet the relevant standards, various OEMs and their suppliers continue to explore lightw...

AI Technical Summary

Problems solved by technology

Compared with PC / ABS, polypropylene (PP) has more specific gravity and cost advantages, however, the linear thermal expansion coefficient of ordinary polypropylene material is 150×10 -6 ~200×10 - 6 mm / mm. K, while the linear thermal expansion coefficient of the inner plate structure material is 15×10 -6 ~25×10 -6 mm / mm. K, the difference between the two is too large to achieve effective size matching, which limits its use

In order to solve this problem, people have explored in recent years. For example, CN 102206373 A mentions that talcum powder is used as the main component of inorganic filler masterbatch to fill and modify polypropylene to reduce the linear thermal expansion coefficient of polypropylene; patent CN 102276922 A Using high aspect ratio inorganic fillers, such as wollastonite, etc., to fill and modify polypropylene, which reduces the linear thermal expansion coefficient of polypropylene; however, the above method further increases the material density while realizing the low linear expansion coefficient of polypropylene. , which increases the weight of the product, which is detrimental to the lightweight of the tailgate

Patent CN 102924806A uses ultra-fine talc powder and chopped glass fiber to modify polypropylene to prepare a polypropylene material with a low linear expansion coefficient. This method also has problems such as increasing the material density and the weight of the tailgate product. In the production process of modified polypropylene materials, it is difficult to feed superfine talc powder, it is difficult to disperse, the production efficiency is reduced, the surface of the tailgate is floating in the injection molding process, and it is difficult to spray, etc.

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