Graphene and glass fiber reinforced flame-retardant composite material and preparation method thereof
A flame-retardant composite material and glass fiber technology, applied in the field of composite materials, can solve problems such as the slow pace of technological innovation in the epoxy industry, backward production of high-end epoxy resin, and non-compliant use of safe use, so as to improve mechanical properties and improve mechanical properties. Performance, the effect of improving the interface binding force
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[0023] In a typical embodiment of the present application, a preparation method of any of the above-mentioned graphene and glass fiber reinforced flame-retardant composite materials is provided, the preparation method comprising: preparing nitrogen-phosphorus modified graphene oxide into a suspension ; Add epoxy resin, dicyandiamide and mold release agent in turn to the suspension to obtain mixed glue; immerse the mixed glue on glass fiber cloth and carry out preliminary curing to obtain prepreg; heat the prepreg curing to obtain a flame retardant composite material.
[0024] In the above preparation method, a prepreg with flame retardant properties is prepared by blending nitrogen-phosphorus modified graphene oxide and epoxy resin, and a small amount of functionalized graphene can be added to achieve the flame retardant effect, and the vertical combustion level has reached V-1 grade, and the prepared composite material can be self-extinguishing without melting and dripping ph...
Embodiment 1
[0042] (1) the preparation method of graphene oxide is as follows:
[0043] Put 18g graphite powder into the mixed solution of concentrated sulfuric acid (concentration is 95wt%) and concentrated phosphoric acid (concentration is 85wt%), slowly add 15g potassium permanganate at low temperature, and stir slowly, then pour the stirring solution into On the ice cubes of deionized water, gradually add hydrogen peroxide, wait until the solution changes from purple to bright yellow, use a centrifuge to separate the graphene with low oxidation degree at 4200r / min. speed, and then centrifuge at 10000r / min. The precipitate is obtained, washed with hydrochloric acid for several times, and then dialyzed with a dialysis bag. After the dialysis is completed, a freeze desiccant is used to keep the sample constant weight, and the final product graphene oxide is obtained.
[0044] (2) the preparation method of the graphene oxide modified by nitrogen and phosphorus is as follows:
[0045] The...
Embodiment 2
[0051] The difference from Example 1 is that (3) the preparation of the composite material is as follows:
[0052] Pour 1.2 parts of nitrogen-phosphorus modified graphene oxide into an appropriate amount of acetone solution and ultrasonically process it into a suspension, add 40 parts of EP-44 epoxy resin, and continue stirring at 80° C. until uniform. 3.4 parts of DICY and 0.1 part of stearic acid were added to the mixed solution and stirred evenly, then placed in a vacuum oven at 60 °C for 1.5 h to remove excess acetone solvent, and then the mixed glue solution was evenly immersed in 60 parts of glass. On the fiber cloth, put it in a drying oven at 140 ° C until it does not stick to the hand, prepare a prepreg, set the temperature of the hot press to 140 ° C, put the 3-layer prepreg in the hot press, and adjust the pressure to 0.6MPa, take out after curing for 1.5h, and make a glass fiber reinforced graphene oxide / epoxy composite material with flame retardant properties.
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