Thermoplastic composites are glass Fiber, carbon Fiber, aramid Fiber and other reinforced thermoplastic resins, known abroad as FRTP (Fiber RINFORCED Thermo Plastics).
From the perspective of production technology, plastic composites can be divided into two categories: short fiber reinforced composites and continuous fiber reinforced composites.
(1) Short fiber reinforced composite material ① injection molding process;② extrusion molding process;(3) centrifugal molding process.
(2) continuous fiber reinforced and long fiber reinforced composite materials
A,prepreg molding;
B,sheet molding plastic stamping;
C,Vacuum forming of sheet molding plastics;
D,prepreg yarn winding forming;
E,Pultrusion molding.
The special properties of thermoplastic composites are as follows:
(1) The density of thermoplastic composites with low density and high strength is 1.1 ~ 1.6g/cm3, which is only 1/5 ~ 1/7 of steel and 1/3 ~ 1/4 lighter than thermosetting FRP.It is able to achieve higher mechanical strength at a smaller unit mass.Generally speaking, whether it is general plastics or engineering plastics, the glass fiber reinforced, will obtain a higher strengthening effect, improve the strength of the application grade.
(2) The physical properties, chemical properties and mechanical properties of thermoplastic composites with high degree of freedom are all designed through reasonable selection of raw material types, proportioning, processing methods, fiber content and laying-up methods.As the matrix material of thermoplastic composites is much more than that of thermosetting composites, the degree of freedom of material selection and design is much greater.
(3) thermal properties of general plastic use temperature of 50 ~ 100℃, with glass fiber reinforced, can be increased to more than 100℃.The thermal deformation temperature of nylon 6 is 65℃, and the thermal deformation temperature can be increased to 190℃ after reinforced with 30% glass fiber.The heat resistance of polyether ether ketone resin is up to 220℃, and the use temperature can be raised to 310℃ after being reinforced with 30% glass fiber. Such high heat resistance can not be achieved by thermosetting composite materials.The linear expansion coefficient of thermoplastic composites is 1/4 ~ 1/2 lower than that of unreinforced plastics, which can reduce the shrinkage rate in the forming process and improve the dimensional accuracy of products.
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