Preparation method for livestock manure-based superabsorbent polymer

A preparation method for a livestock manure-based superabsorbent polymer, comprising the steps of:

• (1) dispersion of livestock manure:
• drying, crushing and sieving livestock manure for later use, and stirring the treated livestock manure in distilled water at 40-70° C. for uniform dispersion to obtain a livestock manure slurry;
• (2) preparation of monomer solution:
• taking a reactive monomer, and preparing the same into a monomer solution, followed by placing the monomer solution in an ice-water bath for later use;
• (3) polymerization:
• raising a temperature of the livestock manure slurry obtained in step (1) to 60-70° C., adding an initiator for pre-initiation under stirring, slowly adding the monomer solution and a cross-linking agent in sequence, stopping stirring after a colloidal viscous mass appears in a reaction, and continuing the reaction for 2-3 h to obtain a crude product;
• and
• (4) product impurity removal:
• washing the crude product obtained in step (3) with deionized water, soaking the washed crude product in anhydrous ethanol, and performing dehydration, impurity removal, drying and crushing on the product to obtain a livestock manure-based superabsorbent polymer.