Epoxy resin composition for fiber reinforced composite material, a production method for fiber reinforced composite material, and a fiber reinforced composite material

Abstract

An embodiment of the invention relates to an epoxy resin composition for fiber reinforced composite material having an epoxy resin that is liquid at room temperature (component 1), aromatic polyamine that is liquid at room temperature (component 2) and diaminodiphenylsulfone (component 3). The proportion of component (1) relative to the entire epoxy resin in the composition is 60-100 wt %. The sum of the proportions of components (2) and (3) relative to the entire polyamine in the composition is 70-100 wt %. The proportion of component (3) relative to the entire polyamine in the composition is 25-60 wt %. The stoichiometric ratio of the entire polyamine to the entire epoxy resin in the composition is 0.7-1.3. Additional embodiments of the invention relate to other aspects of the invention.

1 . A method of producing a fiber reinforced composite material, comprising:
 providing a liquid epoxy resin;   providing a liquid aromatic polyamine;   providing a solid diaminodiphenylsulfone comprising 3,3′-diaminodiphenylsulfone and 4,4′-diaminodiphenylsulfone;   dissolving the solid diaminodiphenylsulfone in the liquid aromatic polyamine;   mixing the liquid epoxy resin and the liquid aromatic polyamine in which the solid diaminodiphenylsulfone is dissolved;   impregnating reinforcing fibers with the mixed liquid epoxy resin and liquid aromatic polyamine; and   curing the impregnated reinforcing fibers.   
   
   
       2 . The method of  claim 1 , further comprising adding to the liquid aromatic polyamine an accelerator selected from strong acid esters, onium salts, Lewis acid-amine complexes and polyphenols. 
   
   
       3 . The method of  claim 1 , wherein the reinforcing fibers are impregnated at 40-90°, pre-cured at 80-140° C. and after-cured at 170-190° C. 
   
   
       4 . The method of  claim 1 , wherein the reinforcing fibers occupy 50-80% by volume of the produced fiber reinforced composite material.