As early as the 1980s, European and American countries put forward the concept of LFT. However, due to the relative backwardness of the fiber impregnation technology and the injection molding, compression molding process and production equipment of long fiber pellets at that time, and the research and application of short fiber reinforcement, filling and other modification technologies of thermoplastics at that time Great progress has led to slow progress in the research of LFT technology. In the mid-1990s, automobile lightweight became the development trend of new types of automobiles, which made people once again turn their attention to LFT research and development.
LFT, long fiber reinforced thermoplastic material, is compared with ordinary fiber reinforced thermoplastic materials, under normal circumstances, the fiber length in fiber reinforced thermoplastic materials is less than 1 mm, while in LFT, The length of the fiber is generally greater than 2 mm. The current processing technology has been able to keep the fiber length in the LFT above 5 mm.
LFT (Long Glass Fiber Reinforced Plastic) uses PP the most as the matrix resin, followed by PA, and some resins such as PBT, PPS, SAN, etc. are also used. The long fiber is impregnated with a special resin system through a special mold to obtain a long strip fully infiltrated by the resin, and then cut into the required length as required. Depending on the end use, the finished product can be strips, strips, boards with a certain width, or even rods, which can be directly used to replace thermosetting products. There are many applications of LFT in automobiles, and the main advantage is the flexibility that materials can be compounded in it.
The manufacturing process of the LFT sheet is very similar to the SMC (sheet molding material) in the thermosetting composite glass fiber reinforced plastic. The same is made by pressing a sheet in a mold. LFT is a hard sheet that is heated and softened and then cold-pressed in a mold, while SMC is a cold-pressed soft sheet that is placed in the mold and hot-pressed.
Compared with SMC sheet, LFT sheet has the following advantages in technical performance:
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