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Long glass fiber reinforced polypropylene plastic refers to a modified polypropylene composite material with glass fiber length of 10-25mm, which is formed into a three-dimensional structure through injection molding and other processes, abbreviated as LGFPP. Because of its excellent comprehensive performance, long glass fiber reinforced polypropylene is more and more widely used in the automotive field.

In the injection molded product, the long glass fibers are staggered into a three-dimensional network structure. Even after the polypropylene substrate is burned, the long glass fiber network still forms a glass fiber skeleton with a certain strength, while the short glass fiber generally becomes a non-strength fiber after burning. skeleton. This situation is caused mainly because the length-to-diameter ratio of the reinforcing fiber determines the reinforcing effect. Fillers and short glass fibers with a critical aspect ratio less than 100 have no reinforcement, while long glass fibers with a critical aspect ratio greater than 100 play a reinforcement role.

Compared with metal materials and thermosetting composite materials, long glass fiber plastic has low density, and the weight of the same part can be reduced by 20% to 50%. Long glass fiber plastic can provide designers with greater design flexibility, such as moldable shapes with complex shapes. The number of components and integrated parts used saves mold costs (generally, the cost of long glass fiber plastic injection molds is about 20% of the cost of metal stamping molds), and reduces energy consumption (the production energy consumption of long glass fiber plastics is only 60% of that of steel products. %~80%, 35%~50% of aluminum products), simplifying the assembly process.

Application of Long Glass Fiber Reinforced Polypropylene in Automobile Parts

Long-fiber reinforced polypropylene is used in the car’s dashboard body frame, battery bracket, front-end module, control box, seat support frame, spare placenta, mudguard, chassis cover, noise barrier, rear door frame, etc. .

Front-end module: For automotive front-end modules, using LGFPP (LGF content 30%) material, it can integrate more than 10 traditional metal parts such as radiators, speakers, condensers, and brackets into a whole; it is more corrosion-resistant than metal parts. The density is small, the weight is reduced by about 30%, and it has a higher degree of design freedom. It can be recycled directly without sorting and processing; it reduces manufacturing costs and has obvious advantages in cost reduction.

Instrument panel body skeleton: For soft instrument panel skeleton materials, using LGFPP material has higher strength, higher bending modulus, and better fluidity than filled PP materials. Under the same strength, the thickness of the instrument panel design can be reduced to reduce weight , The general weight loss effect is about 20%. At the same time, the traditional multi-component instrument panel bracket can be developed into a single module. In addition, the material selection of the front defrosting duct body and the middle frame of the dashboard is generally the same material as the main frame of the dashboard, which can further improve the weight reduction effect.

Seat back: It can replace the traditional steel frame to achieve a weight reduction of 20%, and has excellent design freedom and mechanical performance, and features such as expanded seating space.

The application significance of long glass fiber reinforced polypropylene in the automotive field

In terms of material substitution, long glass fiber reinforced polypropylene products can reduce weight and cost at the same time. In the past, short glass fiber reinforced materials replaced metal materials. In recent years, with the application and development of lightweight materials, long glass fiber reinforced polypropylene materials have gradually replaced short glass fiber reinforced plastics in more and more auto parts, which is further promoted. The research and application of LGFPP materials in automobiles.