The glass fiber reinforced composite materials currently used in automobiles include: reinforcing fibers, mat fiberglass reinforced thermoplastic materials, sheet molding compounds, resin transfer molding materials and hand lay-up FRP products.

  At present, the glass fiber reinforced plastics used in automobiles mainly include: PP fiberglass chopped strands, glass fiber reinforced PA66 or PA6, and a small amount of PBT and PPO materials. Reinforced PP is mainly used to make products such as engine cooling fan blades, upper and lower covers of timing belts, but some products have defects such as poor appearance quality and warpage, so non-functional parts are gradually filled with PP such as talcum powder and other inorganic fillers. alternative.

 

 

  Plastic intake manifold is a new technology developed in recent years. Compared with aluminum alloy cast intake manifold, it has the advantages of light weight, smooth inner surface, shock absorption and heat insulation, etc., so it is widely used in foreign automobiles. , All the materials used in it are glass fiber reinforced PA66 or PA6, mainly using the fusion core method or vibration friction welding method. At present, relevant domestic units have carried out research in this area and achieved phased results.

 

With the requirements of light weight and environmental protection in automobiles, the foreign automobile industry is more and more inclined to use GMT materials to meet the needs of structural parts, mainly because stitched chopped strand mat materials have good toughness, short molding cycle, and production efficiency. It is regarded as one of the materials in the 21st century with a series of advantages such as high cost, low processing cost and no pollution to the environment, and is mainly used in the production of multifunctional brackets for passenger cars, instrument panel brackets, seat frames, engine guards, battery brackets Etc., the Audi A6 and A4 cars currently produced by FAW-Volkswagen have adopted stitch mat fiberglass materials, but they have not achieved localized production.

 

Sheet molding compound (SMC) is mainly composed of SMC roving, unsaturated resin, low shrinkage additives, fillers and various auxiliaries. It is an important glass fiber reinforced thermosetting plastic. The advantages of mass production and A-grade surface are widely used in automobiles. At present, there has been new progress in the application of foreign SMC materials in automobiles. Now, the largest application of SMC in automobiles is body panels, accounting for 70% of the amount of SMC, and structural parts and transmission parts are the fastest growing. In the next five years, the amount of SMC used in automobiles will continue to increase by 22% to 71%, while the growth rate in other industries will be 13% to 35%.

 

 

(2) Application of low-density SMC materials The specific gravity of low-density SMC is 1.3. In practical applications and tests, it is 30% lighter than standard SMC, and the specific gravity of standard SMC is 1.9. Using this low-density SMC can reduce weight by approximately 45% compared to comparable parts made of steel.

(3) Other applications The application of SMC in automobiles, in addition to the above-mentioned new uses, is also used to produce other parts, such as: cab doors, inflatable roofs, bumper frames, cargo doors, sun visors, A And D pillars, body panels, roof drains, carport side rails, truck boxes, etc. Among them, the large amount is used for the outer panel of the body.