Sizing agent of liquid polyacrylonitrile oligomer and application thereof to carbon fibre
A technology of polyacrylonitrile and oligomers, which is applied in the fields of carbon fiber, fiber treatment, textiles and papermaking, etc., which can solve the problems of carbon fiber composite materials such as reduced interlayer strength, inability to withstand high temperature, unfavorable carbon fiber, etc., and achieves improved mechanical properties and low cost. Low, good friction performance
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Embodiment 1
[0020] Using acrylonitrile (AN) as a monomer raw material, azobisisobutyronitrile (ABIN) as a free radical initiator, and reacting for 20 minutes at a reaction temperature of 65 ° C, a liquid polyacrylonitrile oligomer (LPAN) with a molecular weight of 1200 was synthesized. ).
[0021] The above-mentioned LPAN is thermally oxidized in an ordinary oven at a heat treatment temperature of 125°C to obtain polyacrylonitrile with a carbon content greater than 80%, thereby preparing the liquid polyacrylonitrile oligomer sizing agent.
[0022] Place the polyacrylonitrile oligomer sizing agent in the dipping device and heat it to 50°C; then immerse the pre-dried polyacrylonitrile-based carbon fiber (T300) in the above liquid sizing agent for 10 minutes, take it out, and drain the surface of the fiber liquid, ready to use.
[0023] The polyacrylonitrile-based carbon fibers impregnated with liquid polyacrylonitrile were placed in an ordinary blast oven, and heat-treated in an air atmosp...
Embodiment 2
[0027] Using acrylonitrile (AN) as a monomer raw material, azobisisobutyronitrile (ABIN) as a free radical initiator, and reacting for 30 minutes at a reaction temperature of 65 ° C, a liquid polyacrylonitrile oligomer (LPAN) with a molecular weight of 1250 was synthesized. ).
[0028] The above-mentioned LPAN is thermally oxidized in an ordinary oven at a heat treatment temperature of 120°C to obtain polyacrylonitrile with a carbon content greater than 80%, thereby preparing the liquid polyacrylonitrile oligomer sizing agent.
[0029] Mix the liquid polyacrylonitrile oligomer sizing agent prepared above with water to prepare a 90% polyacrylonitrile oligomer aqueous solution. Then put it in an impregnation device and heat it to 60°C; immerse the carbon fiber in the above solution for 10 minutes, take it out, drain the liquid on the surface of the fiber, put it in a drying oven, and dry it at 110°C for use.
[0030] Place the carbon fiber impregnated with the aqueous solution ...
Embodiment 3
[0033] First, the sorbitan monostearate polyoxyethylene ether, the fatty alcohol polyoxyethylene ether, and the silicone antifoaming agent are uniformly mixed in a mass ratio of 30:60:10 to obtain the auxiliary agent, which is stored for later use.
[0034] The prepared liquid polyacrylonitrile oligomer sizing agent is used as the main slurry (the preparation method is the same as in Example 1) and added to the previously prepared auxiliary agent, wherein the mass ratio of the main slurry to the auxiliary agent is 100:8. Stir with a high-shear dispersing emulsifier at a stirring speed of 10,000 rpm. Under vigorous stirring, add deionized water and stir for 30 minutes to obtain a sizing emulsion. Dilute the prepared sizing emulsion to 5 wt%.
[0035] Then pour the diluted sizing agent into the impregnation device; impregnate the carbon fiber for 5 minutes, take it out, drain the liquid and solvent on the surface of the fiber, and dry it in a vacuum drying oven for use.
[0036]...
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