LFT, long fiber reinforced thermoplastic material, Engl […]
LFT, long fiber reinforced thermoplastic material, English is Long Fiber reinforced Thermoplastics, 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, and the processing technology has been able to keep the fiber length in the LFT above 5 mm.
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. The most used matrix resin is PP, followed by PA, and some resins such as PBT, PPS, SAN, etc., but different fibers need to be used for different resins to achieve better results; depending on the end use, the finished product can be Long strips, strips, boards with a certain width, or even rods can be used directly to replace thermosetting products.
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 the long fiber pellets at that time, and the research and application of the short fiber reinforcement, filling and other modification technologies of thermoplastics at that time Great progress has been made, which has led to slow progress in the research of LFT technology. In the mid-1990s, with the rapid development of the automobile industry and people’s awareness of environmental protection and energy conservation, especially the energy crisis and rising oil prices, the lightweight of automobiles has become a new type of automobile development trend, and people will pay attention again. The effort turned to the research and development of LFT.