Slow-release cationic anti-mud polycarboxylic-type high performance water reducer and preparation method thereof

Abstract

The present invention discloses slow-release cationic anti-mud polycarboxylic-type high performance water reducer and a preparation method thereof. The slow-release cationic anti-mud polycarboxylic-type high performance water reducer is successfully synthesized from an unsaturated carboxylic acid, a polyether macromonomer, a cationic unsaturated monomer, an unsaturated esters, a crosslinking agent, a chain transfer agent, an oxidizing agent and a reducing agent as raw materials at room temperature without heat source. By introduction of the long-chain-ester crosslinking agent and the cationic unsaturated monomer, the slow-release cationic anti-mud polycarboxylic-type high performance water reducer has good slow-release and anti-mud effects, is low in admixing volume, high in water-reducing rate, excellent in slump retention ability, and not sensitive to mud contained in sand and stones, and the process does not require an additional heat source, an be carried out at room temperature, and is low in investment, low in cost, and suitable for large scale promotion and application.

Description

Technical field: [0001] The invention belongs to the field of concrete admixtures, and relates to a slow-release cationic mud-resistant polycarboxylic acid series high-performance water reducer with high water-reducing rate, good slow-release performance, and capable of suppressing adverse effects of soil on concrete and a preparation method thereof . Background technique [0002] As the third generation of high-performance concrete water reducer, polycarboxylate admixture has the advantages of low dosage, high water reducing rate, good slump performance, strong molecular structure adjustability, and clean production process. The key to the quality of concrete engineering has become an essential material and core technology for the manufacture of high-performance modern concrete. With the rapid development of the concrete industry, a large amount of natural sand and gravel has been exhausted, and due to various material conditions, the sand and gravel resources in various p...

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Problems solved by technology

There are also reports related to mud-resistant polycarboxylic acid in China. For example, Chinese patent CN103467670A proposes a preparation method of mud-resistant polycarboxylic acid. , and then synthesize polycarboxylic acid with alcohol ether, the preparation process requires high temperature and reduced pressure, the process is cumbersome and the cost is high; CN104479084A proposes a preparation method of polycarboxylate anti-mud agent, which is made of polyoxygen with unsaturated double bonds Synthesis of vinyl ether, unsaturated esters, unsaturated carboxylic acid and initiator at high temperature, etc., without special anti-mud functional group, the product is difficult to achieve anti-mud effect, and it must be used in combination with other polycarboxylic acids

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