120 Journal of Donghua University ( Eng． Ed． ) Vol． 39，No． 2 ( 2022) DOI: 10. 19884 /j． 1672-5220. ses． the epoxy resin． Differential scanning calorimetry ( DSC) ， Additive flame retardants are formulated into the resin and dynamic mechanical analysis ( DMA) ，thermal gravitational are added during mixing which is relatively simple and analysis ( TGA) ，the cone calorimeter ( CC) ，and limiting cheap［8］． In this research，additive flame retardants are oxygen index ( LOI) were used to characterize the resins． adopted． Considering that the vacuum assisted resin The results showed significant improvement on the flame infusion ( VAＲI) process requires low resin viscosity， retardance of the synergistically modified resins． ［9］ usually less than 800 mPa · s ，and the conventional Specifically，the carbon residue increased by 113. 6%，and the char thickness increased by 6 to 7 times，compared to high-efficiency flame retardants are usually in powder those of the flammable benchmark resin． The LOI reached form with a particle size at micron levels，which will be 33 and passed the UL94 V-0 vertical burn rating． The filtered by the filaments during infusion，this research modified resins also exhibited adequate stability and selects liquid flame retardants． viscosity suitable for VAＲI
