Liquid alkali-free accelerator and its normal temperature synthesis process

Abstract

The invention discloses a liquid alkali-free quick-setting agent and its synthesis process at normal temperature, comprising the following components in parts by weight: 48-50 parts of aluminum sulfate, 4.5-5.5 parts of magnesium fluorosilicate, and 1.5-5 parts of ferrous sulfate 2.5 parts, urea 3.5-5.5 parts, organosilicon sol 2-3 parts, glycerol 4.5-5.5 parts, AMP-95 (amine neutralizer) 1-2 parts, water 24.5-35.5 parts. The invention solves the problem of too thick solution by reducing the proportion of aluminum sulfate and magnesium fluorosilicate in the whole system. By using AMP‑95 (amine neutralizer) to adjust the pH value of the accelerator, it can effectively increase the pH value of the accelerator without affecting the setting time of the accelerator, and will not introduce alkali metal ions . The use of glycerol can effectively speed up the final setting time, making the final setting time closer to the initial setting time. And this patent does not introduce any inorganic acid, so the corrosiveness of the quick-setting agent to the injection equipment is very small. The invention has the advantages of low corrosion, low cost, small consistency, good comprehensive performance and the like.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a liquid alkali-free accelerator and a synthesis process thereof at normal temperature. Background technique [0002] Alkali-free accelerator is an admixture used to improve the performance of concrete. Taking the currently disclosed formulas and preparation methods as examples, the patent titled "A Highly Adaptable Liquid Alkali-Free Accelerator and Its Preparation at Normal Temperature Method", the patent application number is 201910090482.7, because the temperature of the solution is raised instantaneously by using the reaction of inorganic acid and aluminum hydroxide, so a large amount of inorganic acid will be introduced, so that the amount of inorganic acid in the system is too much and the pH is too low , the prepared alkali-free accelerator is highly corrosive and will cause great harm to the injection equipment; [0003] In the patent name "A Liquid Alkali-f...

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Problems solved by technology

[0002] Alkali-free accelerator is an admixture used to improve the performance of concrete. Taking several formulas and preparation methods disclosed at present as examples, the patent titled "A Highly Adaptable Liquid Alkali-Free Accelerator and Its Preparation at Normal Temperature Method", the patent application number is 201910090482.7, because the temperature of the solution is raised instantaneously by using the reaction of inorganic acid and aluminum hydroxide, so a large amount of inorganic acid will be introduced, so that the amount of inorganic acid in the system is too much and the pH is too low , the prepared alkali-free accelerator is highly corrosive and will cause great harm to the injection equipment;

[0003] In the patent name "A Liquid Alkali-free Accelerator and Its Preparation Method", the patent application number is 201810174062.2, because the use of sodium metaaluminate to neutralize the pH value of the solution effectively reduces the corrosion of the alkali-free accelerator. However, due to the use of more defoamers, triethanolamine and ethylenediaminetetraacetic acid, the cost of the prepared alkali-free quick-setting agent will be high;

[0004] In the patent titled "An Environmentally Friendly Alkali-Free Accelerator and Its Preparation Method", the patent application number is 201710579702.3. In the proportion of each raw material, the proportion of aluminum sulfate and fluorosilicate is too large, which will lead to The consistency of the prepared alkali-free accelerator is too large, especially after entering winter, it will affect the workability of the solution if it is too thick, and the injection equipment with low power may even fail to pump the accelerator

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