The demand for domestic long-fiber reinforced thermoplastic composites is about 500,000 tons, and the annual development speed is twice that of foreign countries. In 2001, the domestic long-fiber reinforced thermoplastic composites accounted for only 5% of the world market share. However, 2013 In the year, the figure has risen to 20%. At present, 80% of domestic long-fiber reinforced thermoplastic composite materials are sourced from import or joint ventures.
The automotive sector is the largest application area for long-fiber reinforced thermoplastic composites. About 70% of LFT products are used in the automotive industry to make large automotive components. Typical examples are:
(1) Front bracket
The front end bracket is injection molded with 30% long glass fiber polypropylene, which integrates the front parts of the radiator, horn, condenser, bracket and other front parts into one part, which reduces the production cost and reduces the weight of the parts of the GMT. About 30%.
(2) door panel module
As a carrier material for automotive modules, the application of long glass fiber reinforced polypropylene in automotive front door modules has been favored by Ford, Mazda and other companies. The door module integrates various functional components such as door locks, door lifters, speakers, and theft prevention. The device is made of 30% long glass fiber reinforced polypropylene material. In the process of developing the door module, experts and scholars have conducted in-depth research on the properties of long glass fiber reinforced polypropylene material for injection molding, especially the creep resistance of the material. The results show that the long glass fiber reinforced polypropylene The material does not produce significant creep even when subjected to high temperatures of 100 ° C and has better creep resistance than short glass reinforced polypropylene.
(3) Car luggage rack and buffer
40% long glass fiber reinforced polypropylene injection molded products have good impact toughness and high strength, and also have the advantages of light weight and low price.
(4) Car battery case
Long glass fiber reinforced polypropylene injection molded articles have excellent creep resistance and low shrinkage. Due to the high strength and toughness of the long glass fiber reinforced polypropylene, the shell wall can be made thin, thereby reducing weight and being easily fixed.
At present, most of the domestic battery cases are formed by ABS resin. The battery case formed by the long glass fiber reinforced polypropylene composite material is not only lower in price than the ABS resin, but also superior in performance to the ABS resin.
(5) Fan blade and motor filter cover of the draft tube
LFTP injection molded materials can be used to replace the fan blades and motor filter covers of motor draft tubes. Due to the large temperature range of these devices, SFRTP and pure resin materials cannot meet the needs of use.
(6) Coaxial cylinder clutch auxiliary parts for trucks
Long glass fiber reinforced nylon composite injection molded products with a glass fiber content of 50% can replace aluminum castings. The long glass/nylon has a smooth surface that maintains the center size to ensure smooth rotation of the elastomeric bushing along the central axis.
In summary, LFT materials have low preparation costs, while mechanical properties such as stiffness, strength and toughness are high, and heat resistance is good. Its main application direction is: structural parts with high requirements on mechanical properties and dimensional stability. In some respects, it can also replace expensive engineering plastics. In addition, it can also be used as a processing aid for improving the strength and toughness of polypropylene resin. .
