Method for producing fiber tape
A fiber tape and fiber technology, applied in the field of fiber tape and laminate, production of fiber tape and/or sizing fiber, can solve the problems of affecting the performance of the laminate, disadvantage, increasing the cost of the laminate, etc.
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Embodiment 1
[0072] Fiber tapes produced using solutions with different concentrations of polymeric materials
[0073] Three sample fiber tapes (Samples 1-3) were prepared as follows. First, by adding polycarbonate ( HF1110, SABIC Innovative Plastics) pellets were dissolved in dichloromethane to prepare a solution (volume of at least 1 liter), which was assisted by a shaker, and the solution was poured into a bath. A tow of carbon fibers (12K size; Formosa TC-35; unsized fibers) was spread into a laid fiber layer and then passed through the bath. From the bath, the spread fiber layer is directed through nip rollers to remove excess solution. Finally, dichloromethane was evaporated from the laid fiber layer using an infrared heater and a hot air oven.
[0074] For sample 1 the solution had 5 wt% polycarbonate, for sample 2 the solution had 7 wt% polycarbonate, and for sample 3 the solution had 10 wt% polycarbonate. For each of the three samples, the line speed was 1 meter per minute (m...
Embodiment 2
[0079] Fiber tapes produced at different line speeds
[0080] A. Using a solution with 5 wt% polycarbonate
[0081] The method described in Example 1 was carried out using a solution with 5 wt% polycarbonate at line speeds of 0.25, 0.50, 1.00 and 2.00 m / min. Figure 8 is a graph of the fiber volume fraction versus line speed for the obtained fiber tapes, including the fiber tape thickness in mm. As shown, it was found that the fiber volume fraction increased with increasing line speed, likely due to less polycarbonate being deposited on the fibers as the residence time of the fibers in the bath decreased.
[0082] B. Using solutions with 15wt% and 20wt% polycarbonate
[0083] The method described in Example 1 was carried out using solutions with 15 wt% and 20 wt% polycarbonate at line speeds of 1, 3 and 4 m / min. Figure 9 is a graph of the fiber volume fraction versus line speed for the obtained fiber tapes, including the fiber tape thickness in mm. As shown, it was found ...
Embodiment 3
[0086] Fiber tape with flame retardant properties
[0087] In the following examples, fiber tapes were produced using the method described in Example 1, and laminates were produced using those fiber tapes. For the fiber tapes and in this example, no flame retardant was included in the solution or otherwise applied to the fibers.
[0088] A. Carbon fiber belt
[0089] The prepared carbon fiber tapes had a thickness ranging from about 0.08 to 0.20 mm, and the flammability of these tapes was tested according to the UL-94 standard. The results are described in Figure 11 middle, Figure 11 Burn length versus fiber volume fraction for the tape is shown, including tape flame out time in seconds (s) (t 1 +t 2 ). For a given strip, the burn length is the length that was on fire during the test. As shown, both burn length and flameout time are inversely related to fiber volume fraction for the tapes produced. Notably, each of the belts produced had a flameout time sufficient fo...
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