Automotive exterior trim material capable of being directly coated by water-based paint and preparation method of exterior trim material

Abstract

The invention relates to an automotive exterior trim material and a preparation method thereof, and in particular relates to an automotive exterior trim material capable of being directly coated by water-based paint and a preparation method of the exterior trim material. The automotive exterior trim material comprises the following components in parts by weight: 65-80 parts of polypropylene, 5-20parts of a filler, 3-15 parts of a toughening agent, 1-10 parts of a hydrophilic modifier, 1-5 parts of an accelerant, 0.5-2 parts of a synergist, 0.3-1 part of an antioxidant, and 0.3-0.5 part of a lubricant. According to the method provided by the invention, after a polypropylene material is subjected to injection molding to form the automotive exterior trim, coating can be directly performed byusing the water-based paint, the exterior trim material has the characteristics of environmental protection, no pollution and low VOC, surface treatment and other processes of oil paint coating of parts are eliminated, and a paint film has strong adhesion and can meet experimental requirements of paint film scribing and oil paint falling in main engine plants such as Volkswagen; and the automotive exterior trim material can be used for short-cycle rapid injection molding, the injection molding cycle can be shortened by 40% or more compared with that of a traditional material, the production efficiency and pass rate of the automotive exterior trimming parts are improved, and the product has high dimensional stability, and is beneficial to solving the problems of zero gap matching design and the like of different automotive parts selected materials.

Description

technical field [0001] The invention relates to an automobile exterior decoration material and a preparation method thereof, in particular to an automobile exterior decoration material which can be directly sprayed with water-based paint and a preparation method thereof, and belongs to the field of material technology. Background technique [0002] In recent years, the development of automotive exterior painting tends to be more environmentally friendly, non-toxic and safer. Compared with oil-based paints, the biggest advantage of water-based paints is that water-based paints are mainly composed of water as a diluent and do not contain organic solvents. They do not contain benzene, toluene, xylene, formaldehyde, and free TDI toxic heavy metals. They are non-toxic and non-irritating. Odor, harmless to the human body, does not pollute the environment, and the process is environmentally friendly, and the coating quality is comparable to traditional oil-based paint. With the co...

AI Technical Summary

Problems solved by technology

At present, it is common practice to add maleic anhydride grafted polyolefin to the polypropylene material to enhance the polarity, but due to the limited grafting rate of maleic anhydride itself, the effect of improving the polarity of the polypropylene material is not obvious, and adding too much will lead to material properties Decreased significantly

On the other hand, there are many and complicated paint spraying processes, time-consuming, and low-efficiency problems in the current automotive exterior decoration. Therefore, it is of great significance to develop polypropylene materials suitable for water-based spraying, especially direct spraying.

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