Slushing agent for concrete and preparation method thereof

Abstract

The invention provides a preparation method of a slushing agent for concrete. The preparation method comprises the following steps in sequence: implementing the first reaction between maleic anhydride and hydroxypropyl methyl cellulose in glacial acetic acid under the catalysis of acetate, so as to obtain the hydroxypropyl methyl cellulose monomaleate; and carrying out free radical polymerization between methyl allyl polyoxyethylene ether, acrylic acid solution and hydroxypropyl methyl cellulose monomaleate under an oxidentive-reductive initiation system, so as to obtain the slushing agent for concrete. According to the slushing agent for concrete, prepared by the preparation method provided by the invention, the molecular structure contains the hydroxypropyl methyl cellulose molecular structure unit, so that the macromolecules of the slushing agent can be entangled with each other to form a net-shaped structure to wrap cement and water for effectively preventing the moisture in the mortar from evaporating, and as a result, the slump keeping property is good. The invention also provides the slushing agent for concrete, and the slushing agent for concrete has the structure as shown in formula (1).

Description

technical field [0001] The invention relates to the technical field of concrete additives, in particular to a concrete water reducer and a preparation method thereof. Background technique [0002] In the operation of cement mixture, in order to make the operation labor-saving and effective, early demoulding shortens the construction period, the cement mixture is required to have high fluidity, and at the same time, the cement mixture can effectively inhibit the loss of slump, and there is sufficient early stage of hardening. Strength, which requires a high-performance concrete water reducer. Concrete water reducer refers to an admixture that can reduce the amount of mixing water and increase the amount of concrete under the condition of the workability of concrete and the amount of cement unchanged. It hinders or destroys the flocculation structure of particles, so that the workability and strength of concrete can be guaranteed while saving the amount of cement. With the d...

AI Technical Summary

Problems solved by technology

[0003] At present, the concentration of residual high-efficiency superplasticizer in concrete decreases too fast, which leads to the rapid collapse of concrete, which has become an engineering problem that needs to be solved urgently.

The method to solve this kind of problem is to adjust the mixing ratio of each component, increase the amount of polycarboxylate superplasticizer or use sodium gluconate, sucrose, molasses and other retarders to solve the problem of cement adaptability. Rapid loss of slump and poor slump retention ability

However, the addition of retarder cannot fundamentally solve the problem of weak slump retention ability. Excessive doping will prolong the setting time of concrete, reduce the quality of concrete, and affect the construction progress.

Images