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Preparation method of water reducing agent mother liquor for concrete

A water-reducing agent and concrete technology, applied in the field of cement water-reducing agent, can solve problems such as inability to improve concrete strength, and achieve the effects of being beneficial to the construction of shotcrete, reducing costs, and reducing the amount of cement used.

Pending Publication Date: 2021-12-14
芜湖南洋新型建材有限公司
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  • Description
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Problems solved by technology

[0013] The purpose of the present invention is to provide a method for preparing the mother liquor of water reducer for concrete, which solves the problem that the existing polycarboxylate high-efficiency water reducer mother liquor cannot improve the strength of concrete in a short time after mixing

Method used

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  • Preparation method of water reducing agent mother liquor for concrete
  • Preparation method of water reducing agent mother liquor for concrete

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Embodiment 1

[0023] Embodiment 1: a kind of preparation method of mother liquor of water reducing agent for concrete, comprises following specific steps:

[0024] (1) Synthesis of esterified raw materials: Add polyethylene glycol and hydroquinone in sequence in a 250mL three-necked flask equipped with a dropping device, a thermometer, and a condenser, stir and heat up to 60°C, then add p-toluenesulfonic acid, Silica gel, after hydroquinone and p-toluenesulfonic acid are completely dissolved, add methacrylic acid drop by drop, the molar ratio of methacrylic acid to polyethylene glycol is 1.2:1, and heat up to within 2-3h Keep warm at 110°C and keep the reaction time at constant temperature for 9 hours. At this time, the esterification rate can reach 95%. Continue to store the product in an oil bath, let it cool down to room temperature slowly, and pour out the upper layer of ester liquid. The lower layer of light yellow solid is solidified Silica gel. The amount of hydroquinone added is 0....

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Abstract

The invention discloses a preparation method of water reducing agent mother liquor for concrete, and relates to the field of water reducing agents for cement. The preparation method comprises the steps of synthesis of ester raw materials, preparation of the water reducing agent mother liquor and the like. The polycarboxylic acid water reducing agent mother liquor has good water reducing performance through a pre-synthesized macromonomer esterification intermediate. According to a prepared water reducing agent, under the condition that strength is kept unchanged, cement consumption is reduced, and cost is lowered; under the condition that working performance is not changed or enhanced, the use amount of mixing water is reduced, a water-cement ratio is decreased, and the strength of the concrete is greatly improved; under the condition that the working performance and the strength of the concrete are not changed, creep, dry shrinkage and cement hydration heat are reduced, the durability of the concrete is improved, and the service life of a concrete workpiece is greatly prolonged; and after the water reducing agent is added into the concrete, the strength of the concrete can be improved within a short time, and sprayed concrete construction is facilitated.

Description

technical field [0001] The invention relates to the field of cement water reducers, in particular to a method for preparing a mother liquor of a water reducer for concrete. Background technique [0002] Polycarboxylate superplasticizers, also known as polycarboxylate high-performance (high-efficiency) water reducers, polycarboxylate superplasticizers, etc., have gradually replaced the previous two generations of water reducers (the first generation of lignosulfonate It is an ordinary superplasticizer and the second generation naphthalene-based, melamine-based high-efficiency superplasticizer) has become one of the main admixtures in the concrete mixing process. [0003] In the process of mixing and hardening of concrete without any admixture, only a small part of the mixing water participates in the hydration reaction of cement as adsorbed water, and a part of it is free water in the cement group, so that the concrete is in the mixing process. It has certain rheology and th...

Claims

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Application Information

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IPC IPC(8): C08F290/06C08F220/56C08F228/02C04B24/16C04B103/30
CPCC08F290/062C04B24/165C04B2103/302C08F220/56C08F228/02
Inventor 梅晶晶马健
Owner 芜湖南洋新型建材有限公司
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