Method for judging whether carbon fiber protofilaments are doubled or not
A carbon fiber precursor and chopped carbon fiber technology, which is applied in the preparation of test samples, optical testing flaws/defects, instruments, etc., can solve the problems of high testing cost, untimely testing results, and inability to meet the needs of engineering production. Achieving simple process and effective results
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Embodiment 1
[0031] Material preparation: surfactant: fatty acid glyceride, 0.5g; dispersant: methanol / ethanol=50 / 50, 150mL; container: 250mL Erlenmeyer flask; PAN-based carbon fiber precursor: 3K, wet-spun, dried and densified , length after short cut: 8mm; light source: sunlight (glare flashlight).
[0032] Add 150mL of methanol / ethanol dispersant to the Erlenmeyer flask, add the chopped strands into the Erlenmeyer flask, then add 0.5g fatty acid glyceride, put a stopper on the mouth of the Erlenmeyer flask, turn over and shake repeatedly for 5min, wait for the After the solution in the flask no longer flows, under the sunlight light source (a flashlight can be used in a dark room), check that there are multiple bundles of parallel filaments in the carbon fiber precursors, refer to figure 2 , where the thickness of the fiber filaments is obviously thicker, that is, there are parallel filaments.
[0033] Verification: Observing the fiber end slices and transverse fibers of the doubling ...
Embodiment 2
[0035] Material preparation: Surfactant: 0.1g each of laundry detergent and lecithin; Dispersant: Acetone, 200mL; Container: 300mL round bottom flask; PAN-based carbon fiber precursor: 12K, dry spray wet spinning, finished precursor, chopped length 9mm; light source: strong light flashlight.
[0036] Add 200mL of acetone into the round bottom flask, add the chopped raw silk into the container, then add 0.1g of laundry detergent and lecithin, turn over and shake repeatedly for 8 minutes, and wait until the solution in the container no longer flows, and put it under the sunlight (A flashlight can be used in a dark room), check the dispersion of monofilaments of carbon fiber precursors, and the existence of parallel filaments.
[0037] Verification: Observe the same bundle of fiber end slices and transverse fibers on the SEM to check the dispersion of the original filaments and the existence of parallel filaments, which is consistent with the results obtained by the above method....
Embodiment 3
[0039] Preparation materials: Surfactant: 0.2g of detergent / fatty acid glyceride each; Dispersant: Ethanol, 300mL; Container: 400mL glass bottle with stopper; PAN-based carbon fiber precursor: 24K, dry spray wet spinning, finished precursor, Chopped length: 8mm; light source: ordinary flashlight.
[0040] Add 300mL of ethanol into a small-mouth glass bottle with a stopper, add the chopped strands into the container, then add 0.2g each of washing essence / fatty acid glyceride, turn over and shake repeatedly for 7min, and wait until the solution in the container no longer flows, and put it in the normal Under the light of a flashlight, check the dispersion of carbon fiber precursor monofilaments, and there is a situation of parallel filaments.
[0041] Verification: Observe the same bundle of fiber end slices and transverse fibers on SEM to check the dispersion of the original filaments, which is consistent with the results obtained by the above method.
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