Preparation method of modified bagasse cellulose superplasticizer containing amino, sulfo group and carboxyl as well as product and application of modified bagasse cellulose superplasticizer

The invention discloses a preparation method of a modified bagasse cellulose superplasticizer containing an amino group, a sulfonic group and a carboxyl group as well as a product and application of the modified bagasse cellulose superplasticizer. The preparation method comprises the following steps: extracting a cellulose polymer from bagasse, carrying out degradation, amino and sulfonylation reaction to obtain a bagasse cellulose oligomer intermediate containing amino and sulfo groups, and condensing the bagasse cellulose oligomer intermediate containing amino and sulfo groups with salicylic acid to prepare the modified bagasse cellulose superplasticizer containing-NH2,-SO3H and-COOH groups. According to the preparation method, bagasse wastes are consumed, and the use of artificial chemicals in the preparation process of the biomass superplasticizer is avoided. The steric hindrance of bagasse cellulose molecules is reduced through microwave acidification pyrolysis. The triethanolamine sodium sulfite and the