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.