Fiber-reinforced thermoplastic resin moldings and fiber-reinforced thermoplastic resin molding materials
A thermoplastic resin and fiber-reinforced technology, which is applied in the field of fiber-reinforced thermoplastic resin molding materials, can solve the problems of increased heat dissipation and achieve the effects of long fiber length, bending characteristics and excellent thermal conductivity
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[0160] Hereinafter, the present invention will be described in detail through examples, but the present invention is not limited to the following examples. First, evaluation methods for various characteristics will be described.
[0161] (1) Measurement of weight-average fiber length of (A) carbon fibers in molded articles
[0162] The 80 mm x 10 mm x 4 mm thick test piece obtained from each of the examples and comparative examples was placed on a hot stage set at 200 to 300°C in a state sandwiched between glass plates and heated to obtain (A) carbon fiber Uniformly dispersed film. (A) A film obtained by uniformly dispersing carbon fibers was observed with an optical microscope (50 to 200 magnifications). Measure the fiber length of 1000 randomly selected (A) carbon fibers, and calculate the weight-average fiber length (L W ).
[0163] Weight average fiber length = ∑ (Mi 2 ×Ni) / ∑(Mi×Ni)
[0164] Mi: fiber length (mm)
[0165] Ni: the number of reinforcing fibers having ...
reference example 1
[0182] (Reference example 1) (A-1) Production of carbon fiber
[0183] Using a copolymer mainly composed of polyacrylonitrile as a raw material, through the steps of spinning, sintering and surface oxidation treatment, the total number of filaments is 24,000, the diameter of single fiber is 7μm, and the mass per unit length is 1.6 g / m, the specific gravity is 1.8g / cm 3 , A homogeneous carbon fiber with a surface oxygen concentration [O / C] of 0.12. The strand tensile strength of this carbon fiber was 4880 MPa, and the strand tensile elastic modulus was 225 GPa.
[0184] Here, the surface oxygen concentration ratio is determined by the following procedure by X-ray photoelectron spectroscopy using surface oxidation-treated carbon fibers. First, a carbon fiber bundle was cut to a length of 20 mm, spread and arranged on a copper sample support stand, and a measurement sample was prepared. After setting the measurement sample in the sample chamber of the X-ray photoelectron spe...
reference example 2
[0186] (Reference example 2) (E-1) Production of composite fiber bundle
[0187] On the roll heated to the coating temperature of 150° C., a liquid film formed by heating and melting the epoxy resin of component (D-1) was formed. In order to form a film with a constant thickness on the roll, a counter-rotating roll was used. The continuous (A-1) carbon fiber bundle obtained in Reference Example 1 was passed over the roll while being in contact with the roll, and the (D-1) epoxy resin was attached. Next, in a chamber heated to a temperature of 250° C. under a nitrogen atmosphere, the carbon fiber bundle to which the epoxy resin was attached was passed between five sets of roller presses with a diameter of 50 mm. By this operation, (D-1) epoxy resin was impregnated inside the carbon fiber bundle, and (E-1) composite fiber bundle was obtained.
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Abstract
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