Abstract: Using corn starch as raw material, the catalytic oxidation wet method was used to study the catalytic oxidation effect of pH, hydrogen peroxide, copper sulfate, temperature and time on corn starch by designing orthogonal experiments, and activated oxidized starch was prepared, the green environmentally loess curing dust suppressant was prepared by using acrylic acid grafting modification of oxidized starch. The results showed thatpart of the hydroxyl group of the corn starch is oxidized into carboxyl group, and the carboxyl content of the oxidized arrowhead starch is 0.371%,at pH=9, 8 mL of H₂O₂, the CuSO₄in 0.04% of the dry basis,and 2 hours of the reaction time at 65 ℃,which showgood oxidation effect is achieved. The results of scanning electron microscope analysis showed that the oxidation reaction is mainly occurred on the surface of starch. Using the starch with the best oxidation degree as the base material, a new green and environmentally dust fixing agent is synthesized bygrafting the acrylic monomer on the oxidized corn starch.And the hardness of the top layer of loess reach 71.4 HA after spraying, which has a very good effect of loess curing and dust suppression.

Key words: corn starch, oxidized starch, carboxyl content, dust fixing agent