Epoxy resin has many excellent properties and is widely used, but after curing of highly crosslinked brittleness limit the successful application in some field. Such as mechanical performance, good electrical insulating properties, good corrosion resistance, low shrinkage rate, good chemical and thermal stability, high strength and high modulus, good bonding performance and excellent processing performance, etc., in the adhesive, electronic instrumentation, light industry, construction, machinery, aerospace, electrical insulation, coatings, adhesive and is widely applied in the areas of advanced composite matrix. Method to improve the toughness of epoxy resin matrix resin toughening and flexible curing agent for toughening, the former research at home and abroad has been relatively mature, and flexible macromolecule toughening epoxy resin curing agent is in recent years the development of the new hot spot.

South China university of technology materials science research so polyethylene glycol (peg), ethylenediamine and TDl as raw materials, synthesis of the end structure of amino polyurethane (ATPU) flexible curing agent, which is used for curing epoxy resin (E - 44) curing the impact strength of 50 kj/m2, ethylenediamine than under the same conditions the impact strength of cured epoxy resin product < 20 kj/m2 have greatly improved. At the same time, ATPU/E - 44 condensates late in the thermal decomposition show better thermal stability.