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A kind of liquid alkali-free quick-setting agent and its synthetic method

A technology of accelerator and liquid, applied in the field of chemical building materials, can solve the problems of high alkali content, strength loss, unfavorable storage and use of accelerator

Active Publication Date: 2021-08-31
湖北恒利建材科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main reason is that the alkali content of the product is too high and the stability is insufficient
At present, the total alkali content of commercially available accelerators is about 15-25%, which will lead to the "alkali-aggregate reaction" of concrete, resulting in a loss of more than 20% of the strength of concrete in the later stage; in addition, most commercially available liquid alkali-free accelerators There will be a large amount of precipitation after standing for one day, which is not conducive to the storage and use of the accelerator

Method used

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  • A kind of liquid alkali-free quick-setting agent and its synthetic method
  • A kind of liquid alkali-free quick-setting agent and its synthetic method
  • A kind of liquid alkali-free quick-setting agent and its synthetic method

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preparation example Construction

[0033] In addition, the present invention also provides a method for preparing a liquid alkali-free setting accelerator. The method comprises: using aluminum sulfate, nano aluminum hydroxide powder with particle size ≤ 150 nm and nano silicic acid powder with particle size ≤ 150 nm as main effective components, and using nano silicon dioxide powder with particle size ≤ 150 nm, polyethylene glycol Alcohol 25000~40000 and polycarboxylate water reducing agent are mixed as auxiliary materials, wherein relative to every 100 parts by weight of the liquid alkali-free accelerator composition, the weight ratio of the nano aluminum hydroxide powder is 12.8 ~20.1%, the weight ratio of the nano-silicic acid powder is 6.4-10.9%, and the weight ratio of the nano-silica powder is 2.4-5.6%. The polyethylene glycol of this molecular weight is selected because the molecular weight and the viscosity of the aqueous solution at this concentration are most conducive to the stability of nanopowder d...

Embodiment 1

[0059] (1), according to the volume ratio of n-butanol and deionized water to be 7:1, measure and measure respectively, after mixing, weigh polyethylene glycol 4000 according to the ratio that the mass accounts for 0.12% of the solution, add the solution and stir evenly. Weigh a certain amount of mixed solution, add it into a reaction kettle with heating and stirring device, heat the solution to 60°C, then weigh aluminum sulfate with a mass of 14% of the solution mass, add it to the reaction kettle and stir to dissolve, and the stirring rate is controlled 540r / min; weigh 25% ammonia water whose mass is 1.2 times that of aluminum sulfate, dissolve in deionized water whose mass is 1.5 times the mass of ammonia water, dissolve and mix well and transfer it to a dripping tank. Slowly drip the prepared ammonia solution into the reaction kettle, and control the dripping speed for 30-60 min. After the dropwise addition is completed, continue to stir the reaction for 30 to 60 minutes; ...

Embodiment 2

[0063] (2), respectively measure according to n-butanol and deionized water volume ratio of 9:1, after mixing, weigh polyethylene glycol 4000 according to the ratio of mass accounting for 0.18% of the solution, add the solution and stir evenly. Weigh a certain amount of mixed solution, add it into a reactor with heating and stirring device, heat the solution to 60°C, then weigh aluminum sulfate with a mass of 28% of the solution mass, add it to the reactor, stir and dissolve, and the stirring rate is controlled 540r / min; weigh 25% ammonia water whose mass is 1.2 times that of aluminum sulfate, dissolve in deionized water whose mass is 1.5 times the mass of ammonia water, dissolve and mix well and transfer it to a dripping tank. Slowly drip the prepared ammonia solution into the reaction kettle, and control the dripping speed for 30-60 min. After the dropwise addition is completed, continue to stir the reaction for 30 to 60 minutes; add the reacted solution to the filter for fi...

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Abstract

The invention discloses a liquid alkali-free quick-setting agent and a preparation method thereof. The main component of the liquid alkali-free accelerator is mAl 2 o 3 ·nSO 3 · xSiO 2 ·yH 2 O, wherein m, n, x, y are non-zero integers, the ratio range of m:n:x:y is 12~15:12:12~20:32~45, and the total alkali in the composition Content≤0.58%. The preparation method includes using aluminum sulfate, nano-aluminum hydroxide powder with a particle size of ≤150nm, and nano-silicic acid powder with a particle size of ≤150nm as the main active ingredients, and using nano-silica powder with a particle size of ≤150nm and a molecular weight of 25,000 to 40000 polyethylene glycol and polycarboxylate superplasticizer are mixed as auxiliary materials. The total alkali content of the quick-setting agent product prepared by the present invention is lower than 0.58%, far lower than 15% of the total alkali content of the commercially available quick-setting agent, which solves the problem that the total alkali content of the quick-setting agent remains high, and the product can Stable storage for more than 180 days, which solves the problem of precipitation of commercially available accelerators after standing.

Description

technical field [0001] The invention relates to a liquid alkali-free accelerator and a preparation method thereof, belonging to the field of chemical building materials. Background technique [0002] Shotcrete is a new type of construction technology that has received the most attention in recent years. It has irreplaceable advantages in tunnel engineering, underground engineering, mining engineering, dam slope reinforcement and emergency rescue. Accelerator is an important part of shotcrete and has an irreplaceable role. At present, the accelerators on the market can be divided into two types according to their state. One is solid accelerators, which are mainly used for dry spraying. During construction, the amount of dust is large and the rebound rate is high, which seriously wastes raw materials and harms the health of construction workers. Healthy; the other is liquid, the main components are aluminate, silicate, this accelerator contains a lot of Na + , it is easy to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/26
CPCC04B40/0039C04B2103/12C04B24/26C04B2103/302C04B22/148C04B22/06C04B22/08C04B14/062
Inventor 黄文明仝浩胜曾博荣雷杨魏运权魏运超
Owner 湖北恒利建材科技有限公司