Quaternary ammonium salt concrete anti-mud agent, and preparation method and application thereof

Abstract

The invention provides a quaternary ammonium salt concrete anti-mud agent, and belongs to the technical field of building materials. The molecular structure of the quaternary ammonium salt concrete anti-mud agent is as shown in formula I, wherein R or R' is a hydrocarbyl group with a molecular weight of 200 or below, or a derivative of the hydrocarbyl group, and X or X' is selected from Cl, Br andI. The invention also provides a preparation method of the anti-mud agent. The preparation method comprises the following steps: 1) dissolving N,N,N,N-tetramethyl-1,4-phenylenediamine and a halogenated hydrocarbon into an inert organic solvent at an inert atmosphere; 2) controlling the temperature of the system, carrying out stirring, and carrying out reflux condensation; and 3) carrying out reduced pressure distillation to remove the organic solvent, adding distilled water to obtain an aqueous solution of the quaternary ammonium salt type concrete anti-mud agent. According to the anti-mud agent provided by the invention, epoxy monomers are not used as raw materials, the safety is high, and the production process is simple and convenient. When the usage amount of the anti-mud agent provided by the invention accounts for 0.05-0.25 wt% of the total mass of the concrete glue material, the addition amount of a water reducing agent of high-mud-containing mechanism sand concrete can be reduced by 0.5% or more, and the newly mixed concrete has no fluidity loss in 3 hours.

Description

technical field [0001] The invention belongs to the technical field of concrete, in particular to a quaternary ammonium salt type concrete anti-mud agent and a preparation method and application thereof. Background technique [0002] With the strengthening of national infrastructure construction, the volume of concrete has increased year by year. As the most important raw material for concrete, the amount of sand and gravel continues to rise. Due to the short supply of high-quality sand, many regional mixing plants use machine-made sand with high mud content for concrete production. Machine-made sand with high mud content will not only reduce the strength and durability of concrete in the later stage, but also increase the amount of admixtures in fresh concrete and accelerate the loss of fluidity, resulting in cost increases and construction difficulties. [0003] Compounding anti-mud agent in admixture is the most common means to alleviate the above problems. At present,...

AI Technical Summary

Problems solved by technology

At present, the anti-mud agents sold in the market can improve the slump performance to a certain extent, but there are also deficiencies, which are mainly reflected in three aspects: (1) The production process is complicated, and many manufacturers use highly explosive epoxy monomers ( Such as ethylene oxide) is used as a raw material to produce anti-mud agent, which is highly dangerous

(2) Many anti-mud agents on the market have an air-entraining effect, and when the amount is too high, it will easily lead to a decrease in the strength of the concrete in the later stage

(3) The scope of application is narrow, and the performance varies greatly when used in different regions

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