A kind of universal anti-mud type polycarboxylate superplasticizer and preparation method thereof

Abstract

The invention discloses a universal anti-mud polycarboxylic acid water reducer and a preparation method thereof. The universal anti-mud polycarboxylic acid water reducer comprises the following components of a macromonomer, unsaturated acid, a functional monomer, an initiator, a reducing agent and a chain transfer agent, the molar ratio of macromonomer to unsaturated acid to functional monomer is 1:2.0-4.5:1.5-2.5, the initiator is 3.0-10.0%. of that of the total mass of the macromonomer and the functional monomer, the reducing agent is 1.5-3.0%. of that of the total mass of the macromonomer and the functional monomer, and the chain transfer agent is 2.5-4.5%. of that of the total mass of the macromonomer and the functional monomer. The polycarboxylic acid water reducer is based on the molecular structure, the polycarboxylic water reducer suitable for high-mud aggregate is obtained by introducing functional groups, good water reducing dispersion capacity of concrete can be sustained on the premise of not increasing dosage of the water reducer, adsorption of mud on the water reducer is weak, good water reducing dispersion capacity of the water reducer can be sustained, anti-mud slump-retaining effect is good, sufficient strength of hardened concrete can be guaranteed, and normal operation of construction is guaranteed.

Description

technical field [0001] The invention relates to a universal anti-mud type polycarboxylate water reducer and a preparation method thereof, belonging to the field of concrete preparation. Background technique [0002] In recent years, with the increasing demand for construction concrete, there are high requirements for admixtures that must be added to concrete, especially in recent years. Development in the direction of environmental protection, high water reduction, high slump retention, and better adaptability to concrete floors. Polycarboxylate superplasticizer is widely used because of its low dosage, high water reducing rate, low concrete shrinkage, and environmental protection. However, a large number of engineering examples and studies have shown that compared with naphthalene-based, aliphatic and sulfamate-based water-reducers, polycarboxylate-based water-reducers are more sensitive to the clay content of aggregates. Because when the mud content is large, the water-r...

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Problems solved by technology

[0003] In the actual production of ready-mixed concrete, when the mud content in the aggregate exceeds the standard and obviously affects the quality of the concrete, the problem is generally solved by washing the aggregate or increasing the amount of polycarboxylate superplasticizer, but washing It will pollute the environment and damage the good gradation of sand, which is not conducive to the effective control of the water-cement ratio of concrete; simply increasing the amount of polycarboxylate-based water-reducing agent can not solve the problems of water-reducing rate and slump retention, and will increase Construction cost, which affects the use of polycarboxylate superplasticizers in the ready-mixed concrete industry

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