Synthetic method of polycarboxylate-type water reducing agent with high water reducing rate and mud resistance

Abstract

The invention relates to a synthetic method of a polycarboxylic acid water reducing agent with a high water reducing rate and mud resistance. The synthetic method comprises the following steps: (1) weighing an initiator reducing component, a chain transfer agent and deionized water, and carrying out uniform mixing to prepare a solution A; (2) weighing an unsaturated acid monomer, an anti-mud functional monomer and deionized water, and carrying out uniform mixing to prepare a solution B; (3) under a water bath condition, adding unsaturated polyether macromonomers and deionized water into a reaction container, and carrying out stirring and mixing; (4) adding an initiator oxidation component into the reaction container in the step (3), dropwise adding the solution A and the solution B at thesame time, and starting a polymerization reaction; and (5) after dropwise adding is finished, continuing to perform stirring, preserving heat for a certain time, and conducting cooling to normal temperature to obtain a target product. Compared with the prior art, the polycarboxylate-type water reducing agent synthesized by the method has the advantages of small doping amount, high water reducing rate, no need for compounding with a water reducing agent with high water reducing rate, good anti-mud effect, strong adaptability to cement, simplicity and environment-friendly synthesis process and the like.

Description

technical field [0001] The invention belongs to the technical field of concrete water reducers, and relates to a method for synthesizing a polycarboxylate water reducer with both high water reducing rate and mud resistance, in particular to a method using isobutylene polyoxyethylene ether (HPEG2400), Unsaturated acid monomers, anti-mud functional monomers, chain transfer agents, initiators and deionized water, using free radical copolymerization to prepare polycarboxylate water reducers with high water reducing rate and mud resistance resolve resolution. Background technique [0002] In recent years, with the increasingly extensive infrastructure construction in our country, people's demand for building materials has continued to grow. However, due to limited material resources such as sand and gravel, high-quality materials that can be used in engineering have become less and less, and a large number of poor-quality materials Sand and gravel materials with high mud content...

AI Technical Summary

Problems solved by technology

However, these measures will inevitably increase the manufacturing cost of concrete per cubic meter and even cause other engineering problems, such as: washing the aggregate will destroy the gradation of the aggregate, which is not conducive to the design of the mix ratio; excessive mixing of water reducers will lead to high air content in concrete , The setting time is too long; the compound anti-mud agent will not only increase the cost of concrete manufacturing, but also need to consider the compatibility of the anti-mud agent and other admixtures

[0004] Chinese patent CN104558434A discloses a preparation method of a silicon-containing polycarboxylate water reducer, which introduces an organic silicon structure into the structure of an ordinary polycarboxylate water reducer, and prepares a large-sized molecular double bond-containing organosilicon unit through a hydrolysis reaction. body, and then the prepared organosilicon monomer is used in the synthesis of polycarboxylate superplasticizer, so that the molecular size of polycarboxylate superplasticizer increases, making it difficult for it to enter the intercalation structure of the soil, thereby achieving mud resistance and The effect of slowing down the consumption of water reducing agent, but the method of preparing double bond-containing organosilicon monomer through hydrolysis reaction has the problem of low conversion efficiency, and the water reducing performance of the synthesized water reducing agent is poor

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