Ester slump retaining type polycarboxylate water reducer and preparation method thereof

Abstract

The invention discloses an ester slump retaining type polycarboxylate water reducer and a preparation method thereof. The ester slump retaining type polycarboxylate water reducer is made from raw materials comprising the following components in parts by weight: 100 parts of esterified macromer solution by weight, 2-6 parts of unsaturated monomer by weight, 1.5-4 parts of unsaturated phosphate by weight, 1-4 parts of an oxidizing agent by weight, 0.9-3.5 parts of a reducing agent by weight, 1-3 parts of a chain transfer agent by weight, 108 parts of water by weight, and 20 parts of industrial sodium hydroxide solution by weight, wherein the concentration of the esterified macromer solution is 75-85%, and a solute thereof is the mixture of methoxy polyethylene glycol methacrylate, crosslinking monomers triethylene glycol dmethylacrglate and methyl methacrylate; the unsaturated monomer is methacrylic acid, acrylic acid, hydroxyethyl methylacrylate, hydroxyethyl acrylate, hydroxypropyl methacrylate or hydroxypropyl acrylate. The ester slump retaining type polycarboxylate water reducer provided by the invention has good slump retaining performance, good dispersibility, good adaptability and low cost.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to an ester slump-retaining polycarboxylate water reducer and a preparation method thereof. Background technique [0002] With the rise of large-scale infrastructure such as nuclear power, water conservancy, tunnels, and bridges in my country, the market demand for polycarboxylate high-performance water reducers continues to grow. Polycarboxylate superplasticizer has become a research and development hotspot in today's society because of its low dosage, high water reducing rate, strong designability, environmental friendliness and good compatibility with cement. [0003] Due to the needs of social division of labor and economic development, the performance requirements of polycarboxylate superplasticizers are also getting higher and higher. However, due to the change of cement, the mud content of sand and stone materials and other factors, the polycarboxylate...

AI Technical Summary

Problems solved by technology

However, due to factors such as changes in cement, mud content in sand and stone materials, polycarboxylate superplasticizers also have problems such as excessive slump loss and poor workability in practical applications.

However, because the dispersibility and slump retention of polycarboxylate superplasticizers are contradictory, usually only one kind of mother liquor has better performance. In order to solve this problem, the industry generally uses high water-reducing polycarboxylate The method of compounding slump-retaining agent and retarder in acid water reducing agent can improve the slump-retaining ability of concrete. The disadvantage of this method is that it is prone to problems such as high cost of slump-retaining agent and excessive prolongation of setting time.

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