Preparation method of powder polycarboxylate superplasticizer for concrete

The invention relates to the field of preparation methods of powder polycarboxylate superplasticizer for concrete and external additives of concrete, and particularly relates to a preparation method of a powder polycarboxylate superplasticizer for concrete. The main purpose of the invention is to increase the solid content of polycarboxylate to 98 on the basis of ensuring that the basic propertiessuch as water reducing performance, durability, slump retention and the like are not influenced; the polycarboxylate with a high solid content has the advantages of simple synthesis process, low energy consumption and high yield in industrial production; more prominent, the minimum pollution in the production process is ensured through the selection of an acidic environment for production, and the preparation method does not harm human bodies and the environment. In addition, after the polycarboxylate with a solid content of 98 is synthesized, compared with the content of used common polycarboxylate, the content of u