Method for preparing super absorbent resin by grafting and copolymerizing potato starch oxidized through hydrogen peroxide

The invention discloses a method for preparing super absorbent resin by grafting and copolymerizing potato starch oxidized through hydrogen peroxide, which comprises the following steps: cooling under ice water-bath, neutralizing acrylic acid by aqueous alkali, mixing with potato starch oxidized through hydrogen peroxide, acrylamide and deionized water, performing water-bath heating under nitrogen protection, and slowly heating to the temperature of 45-55 DEG C and performing graft copolymerization to prepare the super absorbent resin. The highest water-absorbing capacity of 1g of optimum product can reach 3000g/g in 7000 times of deionized water. The preparation of super absorbent resin has the following advantages that no impurity is introduced, raw materials are easily dissolved, a gelatinization process when starch is used in a traditional method is not required during preparation of the super absorbent resin, synthesis technology is simplified, polymerization temperature is low, product water-absorbing capacity is high, nitrogen content is high, product performance is excellent, and the preparation is suitable for large scale production and product popularization.