Preparation method and application of catalyst for synthesizing polycarboxylate water reducer macromonomer

Abstract

The invention relates to the technical field of synthesis of polyether in organic chemistry, specifically to a preparation method and an application thereof of a catalyst for synthesizing a polycarboxylic type water-reducer macromonomer. The preparation method of the catalyst for synthesizing the polycarboxylic type water-reducer macromonomer comprises the following steps of enabling 1,1,3,3-tetramethyl guanidine to react with PCl15 in an organic solvent; after the reaction is finished, adding deionized water to a reaction product and separating oil and water; adding a chlorinated solvent to aseparated water phase and separating oil and water; through reduced pressure distillation, removing the solvent from a separated oil phase to obtain pure phosphonitrile chloride; and finally, addingthe phosphonitrile chloride to an alkali metal solution of methallyl alcohol; and filtering an obtained mixture to obtain a methallyl alcohol solution of a methallyl-phosphonitrile catalyst. The invention provides a preparation method of the catalyst methallyl-phosphonitrile catalyst for the polycarboxylic type water-reducer macromonomer; and methallyl random polyether with high quality can be synthesized, and the production cost can be reduced.

Description

technical field [0001] The invention relates to the technical field of polyether synthesis in organic chemistry, in particular to a method for preparing a catalyst for synthesizing macromonomers of polycarboxylic acid-based water reducers and its application. Background technique [0002] Polycarboxylate superplasticizer is the third generation of high-performance superplasticizer developed after the ordinary superplasticizer represented by wood calcium and the high-efficiency superplasticizer represented by naphthalene. Compared with the previous two generations of water reducers, polycarboxylate water reducers have outstanding advantages such as low dosage, strong adjustability of molecular structure, and clean production process. At present, HPPEG and TPEG are mainly used in the market. [0003] With the improvement of concrete engineering requirements, the contradiction between the higher durability index requirements of high performance concrete and the deterioration of...

AI Technical Summary

Problems solved by technology

However, the preparation process of this type of catalyst is relatively complicated, and the recovery cost is high

CN104448287A, CN104558583A have reported the development of a kind of phosphazene oxide catalyst, compared with traditional phosphazene catalyst, its synthesis process is relatively simple, and no special treatment is needed before synthesis, greatly reducing production cost, but its polymerization activity is relatively small

[0005] In summary, the following problems exist in the synthesis of polycarboxylate superplasticizer macromonomer: pure EO polyether cannot meet the higher durability performance index of high-performance concrete engineering and the high requirements of sand and gravel mixture deterioration

The introduction of a certain proportion of PO fragments can meet the requirements of concrete; but the traditional catalysts currently used have high by-products, low relative molecular weight, wide distribution, and high unsaturation, which are not conducive to the synthesis of high-efficiency polycarboxylate superplasticizers

However, the production process of phosphazene catalysts with good effect on PO ring-opening polymerization is complex, difficult to store, and high in cost.

And in our country, the research of phosphazene catalysts is mainly concentrated in the field of curing agent and flame retardant for epoxy resin, and there is no report on the research on catalysts for the synthesis of macromonomers as polycarboxylate superplasticizers.