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Understanding Fiber-Reinforced Thermoplastic Composites
 May 6, 2022
Fiber Reinforced Thermoplastic Composites
Fiber-reinforced thermoplastic composites are an important part of composite materials. Various thermoplastic resins are reinforced with glass fibers (GF), carbon fibers (CF), aramid fibers (AF) and other fiber materials, which are called FRTP ( Fiber Reinforced ThermoPlastics). Advanced fiber-reinforced thermoplastic composites have excellent properties such as high toughness, corrosion resistance and fatigue resistance, simple molding process, short cycle, high material utilization rate (no waste), and no need for low-temperature storage, and have become a research hotspot in the materials industry.
Typical performance benefits of FRTP
Thermoplastic composite FRTP has been used for decades. Compared with thermosetting composites such as phenolic resin, urea-formaldehyde resin, epoxy resin, and polyurethane, thermoplastic composites have some special properties:
  • Low density and high strength: The density of FRTP is 1.1-1.6g/cm3, which is only 1/5-1/7 of steel, 1/3-1/4 lighter than thermosetting FRP, and can be obtained with a smaller unit mass Higher mechanical strength and application grade.
  • Large degree of freedom in performance designability: The physical properties, chemical properties and mechanical properties of FRTP are designed through the reasonable selection of raw material types, proportions, processing methods, fiber content and layup methods. There are many more materials, so the freedom of material selection and design is also much greater.
  • Thermal properties: Generally, the operating temperature of plastic is 50-100℃, and it can be increased to above 100℃ after being reinforced with glass fiber. The heat distortion temperature of fiberglass chopped strands for PA6 is 65°C, and after reinforced with 30% glass fiber, the heat distortion temperature can be increased to 190°C. The heat resistance of PEEK reaches 220°C. After reinforced with 30% glass fiber, the operating temperature can be increased to 310°C. Thermosetting composite materials cannot achieve such high heat resistance.
  • Chemical resistance: It is mainly determined by the performance of the matrix material. There are many types of thermoplastic resins, and each resin has its own anti-corrosion characteristics. Therefore, the matrix resin can be optimized according to the use environment and medium conditions of the composite material. Generally, can meet the requirements of use. The water resistance of FRTP is also better than that of thermoset composites.
  • Electrical properties: FRTP generally has good dielectric properties, does not reflect radio waves, and transmits microwaves well. Because the water absorption rate of FRTP is smaller than that of thermosetting FRP, its electrical properties are better than the latter. After adding conductive material to FRTP, it can improve its conductivity and prevent the generation of static electricity.
  • Waste can be recycled: FRTP can be re-processed and formed, waste and leftovers can be recycled, and the physical and mechanical properties do not change significantly, and it will not cause environmental pollution. environmental requirements.