Preparation method of super-sustained release ester-ether crosslinking polycarboxylic acid water reducer

Abstract

A preparation method of a super-sustained release ester-ether crosslinking polycarboxylic acid water reducer is provided. The method which combines synthesis of an ester water reducer and synthesis of an ether water reducer allows the polycarboxylic acid water reducer synthesized from large monomers containing different chain lengths and simultaneously containing long side chains and short side chains to be researched and developed, and the method which can guarantee good dispersity and good fluidity keeping ability brings conveniences for the concrete construction process. In the esterification reaction process, hydroxyethyl methacrylate is introduced to increase active hydroxy side chains, and the activity of methacrylic acid is effectively controlled, so the esterification rate of a reaction system is high, product performances are high, and the synthetic method of optimized ester polycarboxylic acid water reducer intermediates is researched and developed through utilizing above principles. A certain synergistic effect is reached by introducing high activity ester monomers in the copolymerization process and combining the long side chains and the short side chains of produced polycarboxylic acid, so performances of the ester-ether crosslinking polycarboxylic acid water reducer of the invention are better than the performances of common ester and ether polycarboxylic acids, and the water reducing rate and the fluidity keeping ability are improved.

Description

technical field [0001] The invention relates to a concrete admixture, in particular to a preparation method of a super-slow-release ester ether crosslinked polycarboxylic acid water reducer. Background technique [0002] Water reducers have become an indispensable component of concrete and play an increasingly important role in improving the performance of concrete. As a new type of concrete additive, polycarboxylate superplasticizer not only has high water reducing rate, high plasticity retention, strong adaptability to cement, high strength of formed concrete, post-dry shrinkage, and corrosion resistance. Both are better than the first and second generation water reducing agents, energy saving, environmental protection and green chemistry, these are unmatched by other types of water reducing agents. [0003] With the development of commercial concrete, people have higher and higher requirements for the slump retention performance of polycarboxylate superplasticizers. The...

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Problems solved by technology

However, the raw materials used are relatively expensive, many need to be imported, and the esterification cycle is long. At the same time, the production process is relatively complicated, but the quality of the product is not stable. Compared with ethers, there is a big gap in performance in terms of water reduction.

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