Modified flame-retardant epoxy resin and prepreg and preparation methods of modified flame-retardant epoxy resin and prepreg
A technology of epoxy resin and prepreg, applied in the field of materials, can solve the problems of poor mechanical properties and impact properties, easy burning of epoxy resin, etc., and achieve the effect of improving flame retardancy and mechanical properties
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[0018] The preparation process of the aminated carbon nanotubes is described below. Under the condition of ice bath, 10 parts of carbon nanotubes are added to 14-16 parts of concentrated sulfuric acid and 11-13 parts of nitric acid, and then the temperature is raised to 70-90° C. for 10-14 hours. The obtained solution was centrifuged, washed three times with ethanol, hydrochloric acid and distilled water, and the obtained black solid was freeze-dried to obtain acidified carbon nanotubes. Finally, put the acidified carbon nanotubes in a beaker, add 10 to 15 parts of ethylenediamine and 2 to 5 parts of 2-(7-benzotriazole oxide)-N,N,N',N'-tetramethyl The urea hexafluorophosphate (HATU) catalyst is reacted for 10-14 hours, and the aminated carbon nanotubes are obtained after centrifugal drying. Unless otherwise stated, the parts in the present invention are all parts by weight.
[0019] After that, the aminated carbon nanotubes, flame retardant and epoxy resin are mixed to form ...
Embodiment 1
[0025] 10 parts of carbon nanotubes were added to 15 parts of concentrated sulfuric acid and 12 parts of nitric acid, and then the temperature was raised to 80° C. for 12 hours. The obtained solution was centrifuged, washed with ethanol, hydrochloric acid and distilled water, and the obtained black solid was freeze-dried to obtain acidified carbon nanotubes. The obtained acidified carbon nanotubes were placed in a beaker, 13 parts of ethylenediamine and 3 parts of catalyst HATU were added to react for 12 hours, and the aminated carbon nanotubes were obtained after centrifugal drying.
[0026] 5 parts of aminated carbon nanotubes, 8 parts of phosphoric acid ester and 50 parts of epoxy resin are mixed to form an epoxy resin mixture, and then the epoxy resin mixture and 20 parts of polyamide resin are blended by mechanical stirring and ultrasonication, A modified flame-retardant epoxy resin is obtained.
[0027] The modified flame retardant epoxy resin prepared above is coated o...
Embodiment 2
[0029] 10 parts of carbon nanotubes were added to 14 parts of concentrated sulfuric acid and 11 parts of nitric acid, and then the temperature was raised to 70° C. for 10 h. The obtained solution was centrifuged, washed with ethanol, hydrochloric acid and distilled water, and the obtained black solid was freeze-dried to obtain acidified carbon nanotubes. The obtained acidified carbon nanotubes were placed in a beaker, 10 parts of ethylenediamine and 5 parts of catalyst HATU were added to react for 10 h, and the aminated carbon nanotubes were obtained after centrifugal drying.
[0030] Mix 2.5 parts of aminated carbon nanotubes, 5 parts of phosphoric acid ester and 40 parts of epoxy resin to form an epoxy resin mixture, and then blend the epoxy resin mixture with 8 parts of m-phenylenediamine by mechanical stirring and ultrasonic , to obtain a modified flame retardant epoxy resin.
[0031] The modified flame retardant epoxy resin prepared above is coated on the fiber cloth wit...
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