Carbon fiber reinforced thermoplastic composite material is a composite material (CFRTP) with thermoplastic resin as the matrix and carbon fiber as the reinforcement. There are differences between the thermoplastic resin-based carbon fiber composite material and the traditional thermosetting resin-based carbon fiber composite material in terms of resin matrix, reaction type, and material properties.
The thermoplastic resin-based carbon fiber composite material belongs to crystallization and glass transition during processing, while the thermosetting resin-based carbon fiber composite material undergoes crosslinking and curing reactions. In terms of process difficulty, the thermoplastic carbon fiber composite material is more difficult to infiltrate than the thermosetting carbon fiber composite material in the preparation process, but at the same time, the advantages are also obvious: it has a short molding cycle, good impact resistance, weldability, and secondary molding , High structural design freedom and other advantages. Various parts made of carbon fiber reinforced thermoplastic composite materials have many advantages such as low density, high strength, high toughness ratio, recyclability and reuse, and are widely used in aerospace, military, high-end machinery, medical and other fields prospect.
The commonly used resin matrix of carbon fiber reinforced thermoplastic composite materials are: polyether ether ketone PEKK, thermoplastic polyimide TPI, polyphenylene sulfide PPS, polyether ketone ketone PEKK, etc. The following three carbon fiber reinforced thermoplastic composite materials, carbon fiber reinforced thermoplastic polyimide, carbon fiber reinforced polyphenylene sulfide and carbon fiber reinforced polyether ether ketone, are briefly introduced.
Carbon fiber reinforced thermoplastic polyimide composite material:
As a new generation of high-performance special engineering plastics, thermoplastic polyimide not only retains the characteristics of traditional thermosetting polyimide such as high strength, high temperature resistance, chemical resistance, good dielectric properties, radiation resistance, etc., in toughness and thermal processing Molding has more outstanding advantages. In addition to hot compression molding, extrusion or injection molding can also be used. The addition of carbon fiber can significantly improve the mechanical properties of thermoplastic polyimide. When the volume fraction of carbon fiber reaches 30%, the tensile and bending strength of the material is about 2-3 times that of pure resin. The carbon fiber reinforced method also endows thermoplastic polyimide with better heat resistance and mechanical properties, making it a higher-grade wear-resistant and corrosion-resistant high-performance material.
Carbon fiber reinforced polyphenylene sulfide (PPS) composite material:
Polyphenylene sulfide is also one of the thermoplastic resins favored by the composite material industry. It has excellent mechanical properties, corrosion resistance, and self-flame retardance, so it is often used as a matrix material for various high-performance composite materials. . The mechanical properties of carbon fiber reinforced polyphenylene sulfide composite materials are also affected by the carbon fiber content. Under a certain threshold, the greater the carbon fiber content, the stronger the ability to bear external load. Experiments show that the ILSS of continuous carbon fiber reinforced PPS composite board can still show good stability under the temperature difference of up to 100 ℃.
Carbon fiber reinforced polyetheretherketone (PEEK) composite material:
Polyether ether ketone has high rigidity, good dimensional stability, small linear expansion coefficient, can withstand great stress, will not have obvious extension due to the extension of time, and its density is small, the processing performance is good, suitable for fineness Demanding components. Polyetheretherketone itself is one of the thermoplastic resins with better heat resistance. The long-term working temperature can even reach 250 degrees Celsius. Under such high temperature environment, its mechanical properties are basically not affected. The use of carbon fiber as a reinforcement can further enhance the performance of polyetheretherketone materials in terms of strength, rigidity and wear resistance, and also have a significant extension of the overall service life of the product. Relevant experiments have proved that when the proportion of carbon fiber materials is 25% -30%, the wear resistance of composite materials based on polyetheretherketone is significantly improved, and the addition of carbon fiber materials can effectively enhance its application value and scope of application.
Although China's fiber-reinforced thermoplastic composites-related industries started late, many carbon fiber-reinforced composite structural parts manufacturers have achieved mass production of carbon fiber-reinforced thermoplastic prepregs. For example: Based on the application of thermosetting carbon fiber composite materials, WXZS Carbon Fiber Technology Group independently developed a carbon fiber thermoplastic composite production line integrating prepreg preparation, molding and coating. The production line will gradually achieve the goal of mass production of thermoplastic carbon fiber composite parts with high performance, low cost, and environmental protection. At present, it has launched relevant industrialization cooperation activities with some high-end medical device brands, aerospace and rail transportation parts manufacturers.