Ultra-high efficiency polycarboxylate water reducer and preparation method thereof

Abstract

The invention discloses an ultra-high efficiency polycarboxylate water reducer and a preparation method thereof. The preparation method of the ultra-high efficiency polycarboxylate water reducer is characterized in that methoxypolyethylene glycol (with a constitutional formula HO-(CH2-CH2)n-CH3, wherein n is in a range of 20 to 45), acrylic acid, etc. are utilized as raw materials to synthesize esterified macromers and then acrylic acid, the esterified macromers, acrylamide, sodium alkyl sulfonate, etc. undergo a copolymerization reaction in the presence of ammonium persulfate as an initiator. The ultra-high efficiency polycarboxylate water reducer of the invention has the advantages of simple processes, no pollution, low contents of additives, high water reducing rate, good adaptability for various cements, high strength, etc.

Description

technical field [0001] The invention relates to a concrete admixture, in particular to a super-efficient polycarboxylate water reducer. Background technique [0002] Water reducer is the most commonly used and important admixture for concrete. With the increasing demand for high-strength and ultra-high-strength fluidity concrete, there is a need for high-performance water reducing agents that are environmentally friendly and maintain good concrete fluidity. [0003] Polycarboxylate water reducer is the most comprehensive and environmentally friendly concrete water reducer. The polycarboxylate high-efficiency water reducer with a comb-shaped molecular structure is suitable for the preparation of high-strength, ultra-high-strength, high-fluidity due to its high water-reducing rate, good slump retention performance, low dosage, no pollution, and less retarding time. durable and self-compacting concrete. It has a strong dispersion ability to cement, and its water reduction ef...

AI Technical Summary

Problems solved by technology

Concrete prepared with naphthalene-based water reducer loses fast in slump (more than half of the slump can be lost in one hour), which makes construction difficult and affects project quality

At the same time, because the naphthalene-based water reducer contains too much formaldehyde, some countries have restricted its use

The mineralization composition of my country's cement products is relatively complex, coupled with the extensive application of admixtures, resulting in polycarboxylate water reducers still have problems such as adaptability to different cements, high cost, and unstable performance.

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