A liquid forming method for composite materials with ultra-long open period
A technology of liquid molding and composite materials, which is applied in the field of continuous fiber reinforced resin-based composite material molding technology, can solve the problems of short pot life, high cost of frozen storage, and difficult liquid-state forming process, and achieve rapid viscosity increase and quick response , Increase the effect of process cost
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Embodiment 1
[0028] The composite material reinforced with carbon fiber plain weave fabric was prepared by RTM closed mold process, and the fiber volume content was 48%. The resin is a mixed resin of E51 and bisphenol F epoxy resin, the curing agent is rosin-based anhydride, and the accelerator is a complex of boron trichloride ethylamine. The area of the composite laminate was prepared to be 30cm×30cm, using 9 layers of carbon cloth, and the amount of rosin anhydride was calculated according to the mass content of the resin in the composite material to be 33g.
[0029] a. Dissolve rosin anhydride in 150ml of 3% sizing agent solution (the solvent is acetone), and after fully stirring, spray it on a carbon cloth with a total area of about 0.81m2. After the solvent is completely volatilized, cut it into a piece of cloth with an area of 30cm×30cm There are 9 floors in total.
[0030] b. Lay the cut cloth according to the warp direction and seal it in the RTM mold. Check the tightness ...
Embodiment 2
[0036] The carbon fiber plain weave fabric-reinforced composite material was prepared by the RTM process, and the basic situation was the same as in Example 1, but the fiber volume content was increased to 54.8%. The resin is still a mixed resin of E51 and bisphenol F epoxy resin, the curing agent is rosin-based anhydride, and the accelerator is a complex of boron trichloride ethylamine. The area of the composite laminate was prepared to be 30cm×30cm, using 10 layers of carbon cloth, and the amount of rosin anhydride was calculated according to the mass content of the resin in the composite material to be 28g.
[0037] Dissolve rosin anhydride in 150ml of 3% fixative solution (solvent is acetone), stir well and spray on the total area of about 0.9m 2 After the solvent is completely volatilized, it is cut into 10 layers of cloth with an area of 30cm×30cm. All the other steps are as described in Example 1.
[0038] The cured sample has a good appearance, smooth and flat....
Embodiment 3
[0041] Continue to use the RTM process to prepare carbon fiber plain weave fabric reinforced composites, but the fiber volume content is further increased to 60.3%. The resin is a mixed resin of E51 and bisphenol F epoxy resin, the curing agent is rosin-based anhydride, and the accelerator is a complex of boron trichloride ethylamine. The area of the composite laminate was prepared to be 30cm×30cm, using 11 layers of carbon cloth, and the amount of rosin anhydride was calculated according to the mass content of the resin in the composite material to be 24g.
[0042] The rosin anhydride powder is uniformly deposited on a total area of about 0.99m by a fluidized bed method 2 Then use a focused infrared lamp to gradually scan and heat to about 200°C, let the rosin anhydride powder melt and adhere to the surface of the reinforced fabric, and then cut the surface-loaded fabric into a cloth piece with an area of 30cm×30cm, a total of 11 layers .
[0043] Subsequent processin...
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Abstract
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