lasting washing resisting super absorbent fabric with reference to fig3 for a sem photo of the produced uv pu solution coated onto surfaces of fabric fibers and washed by water for 30 times in accordance with the first preferred embodiment of the present invention the photo shows that the high density mesh bonding formed by the uv pu material on the fabric surface is not damaged or lost by rinsing and the original hydrophilic property of the hydrophilic resin is maintained in this preferred embodiment the photoinitiator is a photosensitizing agent such as benzophenone bp or a reactive diluent with acrylic double bonds is added into the uv pu solution to increase the concentration of the acrylic double bonds so as to enhance the crosslink density of the uv pu material in the second preferred embodiment bisphenol a epoxy resin such as diglycidyl ether bisphenol a dgeba is used as the epoxy resin for preparing the polyurethane prepolymer and the aforementioned polyurethane prepolymer is used for manufacturing polyurethane pu and uv cross linking polyurethane uv pu and the uv cross linking polyurethane uv pu is further applied as a water resisting coating material in this preferred embodiment the bis cyclic carbonates bcc so formed is a polyurethane prepolymer the epoxy resin is di glycidyl ether of bisphenol a dgeba and the catalyst is lithium bromide libr the method of preparing a polyurethane prepolymer comprises the following steps s11 material mixing dgeba 5 moles and lithium bromide 5 mole percents are mixed uniformly until the dgeba is dissolved completely to.