Carbon fibers, manufacturing method therefor, and carbon-fiber-reinforced resin composition
A resin composition and carbon fiber technology, applied in the directions of carbon fiber, fiber chemical characteristics, fiber treatment, etc., can solve the problems of high regeneration cost, insufficient carbon fiber performance, and inability to achieve practicality, and achieve the effect of excellent mechanical properties.
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Embodiment 1
[0077] (I) Treatment of CFRP
[0078] Decomposition of CFRP was performed using a CFRP sample with a length of 20 to 40 mm and a thickness of about 10 mm.
[0079] (1) Pretreatment;
[0080] As a pretreatment, CFRP was heat-treated in air using a muffle furnace under the conditions described in Table 1-1, Table 1-2, and Table 1-3 (Comparative Example). In addition, the samples in Tables 1-3 that were not heat-treated were added for comparison. For each sample after the heat treatment, the conductivity (conductivity), which is an index of electrolysis possibility, was checked with a DC current tester.
[0081] (2) Electrochemical treatment;
[0082] After the heat-treated CFRP was filled into a plastic mesh cage with a diameter of 80 mm and a height of 100 mm, it was placed on the anode side and completely immersed in 0.1M NaOH or 0.1M KOH electrolyte. A carbon electrode was used for the anode, and a cylindrical Cu electrode was used for the cathode. Also, when using 0.1M ...
Embodiment 2
[0104] (1) Preparation of thermoplastic resin composition
[0105] An appropriate sample was selected from each sample in Table 1-1 to Table 1-3 (Comparative Example 1), and a composition with a thermoplastic resin was produced.
[0106] Regarding the production method, after measuring 10 to 30% by mass of recycled carbon fiber bundled with respect to 70 to 90% by mass of the thermoplastic resin, the two materials are mixed at the melting temperature of the thermoplastic resin with a twin-screw extruder ZE40A manufactured by Berstorff, Germany. Temperature conditions for extrusion mixing. In addition, when the amount of carbon fiber added is large, recycled carbon fiber is side-fed from the middle of the screw of the extruder. In addition, for sample 1, a sample having a bundled length of about 1 to 3 cm was used, but for other carbon fiber samples, a sample having a fiber length of 1 to 3 cm was used.
[0107] The obtained pellets were injection-molded using an F85 injectio...
Embodiment 3
[0119] CF samples No. 16 and 34 in Table 1-1 to Table 1-3 (Comparative Example 1) were selected, and after making a nonwoven fabric by a papermaking method, a composition with a thermoplastic resin and a thermosetting resin was prepared.
[0120] (1) Production of carbon fiber non-woven fabric
[0121] The present carbon fibers (average fiber length: 10 mm) in Table 1-1 were dispersed in water, and a slurry for papermaking containing 0.1 to 3.0% of solid content was adjusted. After that, 0.00002 parts by weight of anionic sodium polyacrylate was added as a dispersant, and the carbon fiber dispersion was deposited on the papermaking surface using a papermaking machine with a mesh gap of 0.3 mm and formed into a sheet. , made of paper sheet. In addition, for the obtained composition of the nonwoven fabric and the thermoplastic resin, thermoplastic resin fibers having the same fiber length as the carbon fibers were used, and the carbon fibers were appropriately mixed in advance ...
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