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A kind of non-aqueous phase liquid alkali-free accelerator and preparation method thereof

A non-aqueous liquid and quick-setting agent technology, which is applied in the field of concrete, can solve the problems of loss of coagulation accelerator, product performance degradation, precipitation and precipitation, etc., and achieve the effects of improving deterioration, lowering storage environment requirements, and reducing waste of resources

Active Publication Date: 2022-06-21
天津冶建特种材料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main component in the alkali-free accelerator system—aluminum salt is mainly composed of Al in water 3+ The ionic form exists, but with the extension of the storage period, it is very easy to mix with OH in water - A reaction occurs to form a precipitate, thereby losing the coagulation-accelerating effect, which is also the root of the shelf life of the liquid accelerator
[0006] At the same time, with the decrease of storage environment temperature, Al 3+ The solubility of ions in the water phase will also decrease accordingly, and the problem of precipitation and precipitation will also occur.
In addition, the moisture in the accelerator (accounting for about 30-50%) will crystallize under negative temperature conditions, causing the product to freeze and reduce its performance

Method used

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  • A kind of non-aqueous phase liquid alkali-free accelerator and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0037] A method for preparing a non-aqueous liquid alkali-free setting accelerator, comprising the following steps:

[0038] (1) Add 55.6g of pentane to the reaction vessel, turn on the stirring device, control the temperature at 5-10°C, and simultaneously start to feed nitrogen from the bottom of the reaction vessel, add 30g of triethylaluminum to it, until it is mixed with the solvent homogeneously , then add 10 g of dimethyl aluminum hypophosphite, stop feeding nitrogen after the reaction for 2 h, and obtain the modified organic aluminum salt;

[0039] (2) Add the modified organic aluminum salt into the reaction vessel, turn on the stirring device, and add 0.4 g of hydroxymethyl cellulose and 4 g of calcium formate in turn to ensure that each material is stirred evenly before adding the next material. The reaction time is controlled to be 2 hours, and the temperature of the reactant is ensured to be 15-20° C. through temperature control measures throughout the whole process...

Embodiment 2

[0041] A method for preparing a non-aqueous liquid alkali-free setting accelerator, comprising the following steps:

[0042] (1) Add 34.8g of hexane to the reaction vessel, turn on the stirring device, control the temperature at 5-10°C, and simultaneously start to feed nitrogen from the bottom of the reaction vessel, add 45g of tributylaluminum to it, until it is mixed with the solvent uniformly , then add 15 g of aluminum diethyl hypophosphite, stop feeding nitrogen after 2 h of reaction, and obtain modified organoaluminum salt;

[0043] (2) Add the modified organic aluminum salt into the reaction vessel, turn on the stirring device, and add 0.2 g of hydroxyethyl cellulose and 5 g of calcium acetate in turn to ensure that each material is stirred evenly before adding the next material. The reaction time is controlled to be 2 hours, and the temperature of the reactant is ensured to be 15-20° C. through temperature control measures throughout the whole process, and the modified...

Embodiment 3

[0045] The only difference from Example 1 is: 35 g of triethyl aluminum and 12 g of dimethyl aluminum hypophosphite.

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Abstract

The invention provides a non-aqueous phase liquid alkali-free quick-setting agent and a preparation method thereof. The preparation method comprises the following steps: Step 1 is preparing a modified organic aluminum salt: stirring the solvent, feeding nitrogen into it, and then adding alkylaluminum , after mixing evenly, add aluminum alkyl hypophosphite, stop feeding nitrogen after the reaction to obtain a modified organoaluminum salt; step 2 is to prepare a non-aqueous phase liquid alkali-free accelerator: stir the modified organoaluminum salt, A thickener is added therein, and after mixing evenly, a reinforcing agent is added, and the non-aqueous phase liquid alkali-free accelerator is obtained after the reaction is completed and kept warm. The main coagulation accelerator component of the non-aqueous liquid alkali-free accelerator described in the present invention is the reaction product of alkyl aluminum and alkyl aluminum hypophosphite, which reacts with free water in concrete to generate hydrogen Alumina and some free aluminum ions, these components act as direct accelerator components to accelerate the hydration process of cement and realize rapid setting of concrete.

Description

technical field [0001] The invention belongs to the field of concrete, in particular to a non-aqueous liquid alkali-free setting accelerator and a preparation method thereof. Background technique [0002] Accelerators, that is, admixtures added into concrete to make concrete set and harden rapidly, can be divided into powder and liquid according to form, and can be divided into alkali and alkali-free according to their characteristics. After mixing with cement, it can promote the rapid hydration and coagulation of cement, and form sufficient strength in a very short time to achieve the purpose of emergency repair or rapid setting of concrete in wells. It is an indispensable additive in the construction method of shotcrete. [0003] With the current increasing attention to environmental friendliness and concrete durability, liquid alkali-free accelerators have the advantages of no alkali, no chlorine, no irritating odor, good adhesion, low rebound, and later strength retentio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/38C04B103/12
CPCC04B40/0046C04B2103/12C04B24/40C04B24/003C04B24/04C04B24/383C04B24/00
Inventor 刘伟吴志刚王雪敏杨雪超杨春妹张立雅王金明郭诚孟宪荣李华王垚
Owner 天津冶建特种材料有限公司
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