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Method for coating modified chopped carbon fiber with polyaniline
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A technology of chopped carbon fiber and polyaniline, applied in the direction of carbon fiber, fiber treatment, physical treatment, etc., can solve the problems of low reactivity, poor dispersion, weak bonding strength of resin matrix, etc.
Active Publication Date: 2019-08-09
GONG YI VAN-RES INNOVATION COMPOSITE MATERIAL CO LTD
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[0004] The purpose of the present invention is to provide a method for coating modified chopped carbon fibers with polyaniline, so as to overcome the defects of poor dispersibility, low reactivity and low bonding strength of chopped carbon fibers in the prior art and weak bonding strength with the resin matrix
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Embodiment 1
[0015] A method for coating modified chopped carbon fibers with polyaniline, comprising the following steps:
[0016] (1) Soak 10 g of chopped carbon fiber with a length of 10 mm in 1 L of ammonium persulfate aqueous solution with a concentration of 30 g / L, place it in an ultrasonic cleaning device for 2 hours, ultrasonic power is 300 W, and temperature is 70 ° C to obtain pre-oxidized Chopped carbon fiber suspension;
[0017] (2) Under stirring, add 0.2 mol of aniline hydrochloride to 1 L of the above suspension first, then add 0.2 mol of ammonium persulfate and 0.002 mol of ferrous sulfate, and then react at 5°C for 16 hours under temperature control;
[0018] (3) The product was alternately washed with 0.01 mol / L hydrochloric acid and acetone, rinsed with distilled water until the pH was 7, filtered and dried to obtain polyaniline-coated modified chopped carbon fibers.
Embodiment 2
[0020] A method for coating modified chopped carbon fibers with polyaniline, comprising the following steps:
[0021] (1) Soak 8g of chopped carbon fibers with a length of 5mm in 1L of ammonium persulfate aqueous solution with a concentration of 40g / L, place them in an ultrasonic cleaning device for 3h, ultrasonic power is 200W, and the temperature is 60°C to obtain pre-oxidized Chopped carbon fiber suspension;
[0022] (2) Under stirring, firstly add 0.15 mol of aniline hydrochloride to 1 L of the above suspension, then add 0.15 mol of ammonium persulfate and 0.005 mol of ferrous sulfate, and then react at 7°C for 12 hours under temperature control;
[0023] (3) The product was alternately washed with 0.03 mol / L hydrochloric acid and acetone, rinsed with distilled water until the pH was 7, filtered and dried to obtain polyaniline-coated modified chopped carbon fibers.
Embodiment 3
[0025] A method for coating modified chopped carbon fibers with polyaniline, comprising the following steps:
[0026] (1) Soak 12g of chopped carbon fiber with a length of 15mm in 1L of ammonium persulfate aqueous solution with a concentration of 50g / L, place it in an ultrasonic cleaning device for 4 hours, ultrasonic power is 100W, and the temperature is 40°C to obtain pre-oxidized Chopped carbon fiber suspension;
[0027] (2) Under stirring, firstly add 0.3 mol of aniline hydrochloride to 1 L of the above suspension, then add 0.3 mol of ammonium persulfate and 0.0075 mol of ferrous sulfate, and then react at 10°C for 10 hours under temperature control;
[0028] (3) The product was alternately washed with 0.05 mol / L hydrochloric acid and acetone, rinsed with distilled water until the pH was 7, filtered and dried to obtain polyaniline-coated modified chopped carbon fibers.
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Abstract
The invention belongs to the modification field of chopped carbon fiber, and discloses a method for modifying chopped carbon fiber through polyaniline cladding. The method comprises the following steps: (1) soaking the chopped carbon fiber in an ammonium persulfate aqueous solution with concentration of 30-50g / L, ultrasonically treating for 1-4h to obtain pre-oxidized chopped carbon fiber suspension, wherein in the step (1), 8-15g of chopped carbon fiber is added in each 1L of ammonium persulfate aqueous solution; (2) firstly adding aniline hydrochloride in the above mentioned suspension under the stirring condition, and then adding ammonium persulfate and ferrous sulfate, and reacting for 10-16h by controlling the temperature at 5-10 DEG C, wherein in the step (2), 0.1-0.5moL of aniline hydrochloride, 0.1-0.5moL of ammonium persulfate and 0.002-0.01moL of ferrous sulfate are respectively added in each 1L of suspension; (3) alternately washing a product by using 0.01-0.05mol / L hydrochloric acid and acetone, washing by using the distilled water until the pH is 7, filtering and drying to obtain the modified chopped carbon fiber with polyaniline cladding. The modified carbon fiber obtained through the invention has high dispersity.
Description
technical field [0001] The invention belongs to the modification field of chopped carbon fibers, and in particular relates to a method for coating modified chopped carbon fibers with polyaniline. Background technique [0002] Chopped fibers and their reinforced composites are more and more widely used because of their advantages of high temperature resistance, corrosion resistance, light weight and high mechanical strength. Although it has excellent comprehensive properties, due to its smooth surface, inactive functional groups, low surface energy, and difficulty in infiltration with non-polar substances, it limits the full use of the high performance of chopped fibers, especially in terms of reinforced composite materials. Its poor bonding performance with the polymer matrix leads to problems such as degumming and cracking of the resin matrix during the use of chopped fiber reinforced composites. Therefore, exploring and finding a modification method of chopped fibers to e...
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