Mud-resistant polycarboxylic acid slump-retaining water reducing agent and preparation method thereof

Abstract

The invention discloses a mud-resistant polycarboxylic acid slump-retaining water reducing agent, which is prepared from the following components in parts by weight: 300 to 340 parts of isopentenol polyoxyethylene ether, 10 to 30 parts of dimethyl diallyl ammonium chloride, 2 to 4 parts of an initiator, 20 to 40 parts of hydroxyethyl acrylate, 15 to 30 parts of 2-hydroxyethyl methacrylate phosphate, 3 to 5 parts of sodium alpha-allylsulfonate, 0.6 to 1.2 parts of a reducing agent, 0.4 to 1.0 part of a chain transfer agent, and 250 to 300 parts of deionized water. The preparation method comprises the following steps: mixing deionized water, isopentenol polyoxyethylene ether and dimethyl diallyl ammonium chloride, and then adding an initiator to obtain a mixed solution; and respectively dropwise adding a solution A and a solution B, and adding liquid caustic soda to adjust the pH value. Compared with the traditional slump retaining agent, the product provided by the invention has a certain water-reducing rate, does not influence the setting time and mechanical properties of concrete, and has good adaptability under the condition of high clay content; and the synthesis process is simple, and has the advantages of energy conservation and consumption reduction.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a mud-resistant polycarboxylate slump-retaining water reducer and a preparation method thereof. Background technique [0002] In the past 20 years, with the rapid development of domestic infrastructure and the increasing pressure of environmental protection, concrete raw materials, which are bulk materials for infrastructure construction, have been consumed in large quantities, and high-quality raw materials have become less and less. River sand is a bulk building material in the building materials industry. With the strengthening of environmental protection and the continuous development of infrastructure, river mining is basically restricted, resulting in the gradual development of fine aggregate in the concrete industry in the direction of machine-made sand. The most significant difference between machine-made sand and natural sand is that the particle shape and pa...

AI Technical Summary

Problems solved by technology

[0003] Poor grading of aggregates and high mud content lead to problems such as affecting the workability, strength and durability of concrete when preparing concrete. Conventional methods increase the amount of cementitious materials and concrete sand ratio, resulting in an increase in the amount of concrete cement and water consumption. , poor pumpability and concrete cracking, etc., which affect the quality of the project and the production cost

So now there is a need for a preparation method of mud-resistant polycarboxylate slump-retaining water-reducing agent to solve the problems of increased concrete cement consumption, increased water consumption, poor pumpability, and concrete cracking.

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