The use of fiber
Filling of the fiber can effectively increase the strength and rigidity of the plastic. Fiber reinforced plastic is a rigid structural material.
Fiber reinforced plastics have two main components. The substrate is a thermosetting plastic or thermoplastic filled with fibrous material. Generally, the strength of the matrix is ​​low, while the fibrous filler is relatively rigid but brittle.
In the reinforced plastic obtained by the combination of the two, the fiber is subjected to a large load stress, and the matrix resin supports the fiber to transmit an external load by shear stress at the interface with the fiber.
Thermosetting plastic fiber reinforced plastics are abbreviated as FRP (fiber reinforced plastics), thermoplastic fiber reinforced plastics are written as FRTP (fiber reinforced thermoplastics). If reinforced with glass fiber, prefix G, such as GFRP, GFRTP; such as carbon fiber reinforced prefix C; with boron The fiber is prefixed with B; the aramid polyamide fiber (Kevlar) is reinforced with the prefix K.
Reinforced plastics are dominated by glass fiber. There are many varieties. E-glass is a common common fiber. The content of alkali metal oxide is very low. Hammer Hatton has excellent chemical stability and electrical insulation.
High-strength glass fiber (S-glass) contains components such as magnesium aluminosilicate and has a strength of 10% to 50% higher than that of E-glass fiber. Due to differences in chemical composition and production processes, there are various glass fibers such as high modulus, medium alkali and high alkali. Carbon fiber has greater rigidity and excellent corrosion resistance and is often used to reinforce thermosetting plastics.
The boron fiber itself is a composite material of tungsten wire and boron, and has a high modulus of elasticity, but the fiber is coarse and the manufacturing cost is high. Commonly used epoxy resin as a matrix. Low-density aramid fibers have been used and used in the country for cables and load-bearing members that are subjected to tensile stress.
The surface treatment is to apply a surface treatment agent to the surface of the fiber, and the surface treatment agent includes an sizing agent and a series of coupling agents and auxiliary agents. The coupling agent can form a good bonding interface between the fiber and the matrix resin, thereby effectively improving the bonding strength of the two, and improving the waterproof, insulating and wear-resistant properties of the reinforced plastic.
In industrial production, we need a crimping elastic meter, which is a special test instrument for the crimping properties of natural fibers and chemical fibers. It is widely used in fiber research, production and inspection units. The instrument adopts single-chip microcomputer control to realize the intelligentization of curl elasticity and convenient operation. Used to determine the curl, curl elasticity, curl recovery and their statistical values ​​of individual fibers, with display and print functions. Applicable standard: GB/T14338
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