Alkali-based preparation method of polyacrylic acid

The invention discloses an alkali-based preparation method of polyacrylic acid and belongs to the technical field of organic polymers. The alkali-based preparation method of polyacrylic acid comprises the following steps: preparing a sodium polyacrylate size by using acrylic acid as a raw material, industrial water as a solvent, sodium hydroxide as an alkaline agent, and trimethylolpropane triacrylate, sodium persulfate and isoascorbate as accessories, and preparing the polyacrylic acid product having the particle diameter range of 104-1000 microns by steps of acid pickling, water washing, crushing, drying, crushing and the like. The alkali-based preparation method of the polyacrylic acid has the advantages that integrated feeding is adopted and processes such as dropwise addition are avoided, and therefore, the cost is saved, and meanwhile, the equipment utilization rate is increased, and the percent conversion of the product is increased; besides, the method is simple in process and convenient to operate.