Method for manufacturing sustained release type polycarboxylic acid series dehydragent

Abstract

The invention proposes a compounding formula and manufacture method of a sustained release-type polyocarboxy acid high performance water reducing agent. The compounding formula comprises esterification reaction formula and copolymerization reaction formula. The invention combines the esterification reaction and copolymerization reaction into one to carry on after the improvement of the craftwork.The invention utilizing non-solvent esterification method achieves the esterification reaction in the lower temperature (75 DEG C) through using the compound catalyst. Compared with the two steps, theinvention has better application performance. The invention synthesizes sustained release-type polyocarboxy acid high performance water reducing agent through the adjustment of the reaction conditionand the kind and type of components in each reaction. The product is suitable for the concrete with high request to the control of the slump.

Description

Technical field [0001] The invention relates to a method for manufacturing a slow release type polycarboxylic acid water reducer, in particular to a method for manufacturing a slow release type polycarboxylic acid water reducer applied to high-performance concrete in the construction industry. Background technique [0002] For concrete projects that require high concrete slump control capabilities, especially pumping high-fluidity concrete in summer, such as self-compacting concrete, underwater cast-in-place pile concrete, etc., a slow release type polycarboxylic acid system high-performance water reduction is required Only when the agent is added to the concrete can the slump of the concrete have a higher control ability. For this water reducing agent, currently, most processes adopt solvent (toluene, etc.) entrainment method in the esterification process, and the esterification temperature is generally around 130°C, which causes certain pollution and damage to the environment. ...

AI Technical Summary

Problems solved by technology

Although some admixture manufacturers have industrialized the production of polycarboxylic acid-based high-efficiency water reducers, the product types are relatively single, and the formulation of polycarboxylic acid products has not been adjusted and improved according to the needs of practical applications.

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