| abstract |
The halogen-free intrinsic flame-retardant epoxy resin disclosed by the invention is formed by mixing and crosslinking the following components in terms of mass percentage: epoxy resin 63-92.5%, flame-retardant curing agent 7.5-24% , co-curing agent 0~15%, its limiting oxygen index is 26.0~44.5%, UL-94 vertical combustion rating is V-1~V-0, impact strength is 5.6~18.0kJ? m -2 . The invention also discloses its preparation method. Because the flame retardant curing agent modified ammonium polyphosphate used in the present invention can not only effectively participate in the curing crosslinking reaction of epoxy resin as a curing agent, but also is a highly efficient halogen-free expansion flame retardant, especially in the co-curing agent Under the combined action of the two components, a halogen-free intrinsically flame-retardant epoxy resin cured product with excellent curability and flame retardancy can be obtained. |