Preparation method of oxidized anticoagulant starch adhesive

A preparation method of oxidized anticoagulant starch adhesive, characterized by comprising the following steps:

• (1) mixing an original starch and deionized water to form a 40-45% starch emulsion, then adjusting pH value to 7-11 with sodium hydroxide, and performing an oxidation reaction at 40-60° C.;
• after the oxidation reaction is completed, adding a reductant to react with the unreacted oxidant;
• after the reaction is completed, adding sodium bicarbonate to adjust the pH to 7-11, and adding an esterifying agent for esterification reaction;
• after the esterification is finished, neutralizing a product obtained with acid, washing with water, suction filtrating and drying the product to obtain starch granules;
• wherein, the esterifying agent includes both a carboxyl functional group participating in the esterification reaction and a BF4− having an associative thickening effect, and the esterifying agent comprises the following structural formula:
• (2) formulating the starch granules obtained in step (1) into a 40-50% starch emulsion, performing gelatinization, and adjusting pH value to 6.5-7.5 after gelatinization, then adding a dispersing agent, a defoamer and water to form a starch adhesive.