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A method for synthesizing fluorine-free and alkali-free quick-setting agent at normal temperature

A technology of room temperature synthesis and quick-setting agent, which is applied in the direction of sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problems affecting the health of construction workers on site, significant concrete durability, etc., and achieve improved stability and Accelerating coagulation effect, reducing heating equipment investment, and reducing production cost

Active Publication Date: 2022-05-31
JIANGSU SOBUTE NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the patent CN201811544252.5 discloses a liquid alkali-free accelerator and its preparation and application. It uses highly toxic raw material hydrofluoric acid as a cosolvent to prepare the alkali-free accelerator, but hydrofluoric acid will not only significantly improve the durability of concrete , and will seriously affect the health of construction workers on site

Method used

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  • A method for synthesizing fluorine-free and alkali-free quick-setting agent at normal temperature
  • A method for synthesizing fluorine-free and alkali-free quick-setting agent at normal temperature
  • A method for synthesizing fluorine-free and alkali-free quick-setting agent at normal temperature

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The method for synthesizing fluorine-free and alkali-free quick-setting agent at normal temperature comprises the following steps:

[0029] (1) Mix 0.33g of 2-acrylamide-2-methylpropanesulfonic acid, 0.33g of N,N-dimethylacrylamide and 98.85g of water, stir evenly and then heat up to 60°C; control the dropping rate at 0.1 ml / min, drop 0.33 g of acrylic acid and 0.15 g of ammonium persulfate solution simultaneously, react for 4 hours; obtain a stable coagulant after cooling to room temperature;

[0030] (2) Mix 55g of 60-100 mesh aluminum sulfate, 2g of 150-200 mesh aluminum hydroxide and 27.9g of water, and shear at room temperature with a high-speed disperser at a speed of 1000 rpm for 8 hours; adjust the speed to 50 RPM, then add 10g of viscosity reducer and 0.1g of dispersant in turn, and shear for 15 minutes; keep at 50 RPM, add 5g of stable coagulant and shear for 15 minutes to obtain the final alkali-free accelerator.

Embodiment 2

[0032] The method for synthesizing fluorine-free and alkali-free quick-setting agent at normal temperature comprises the following steps:

[0033] (1) Mix 2g 2-acrylamide-2-methylpropanesulfonic acid, 2g N,N-dimethylacrylamide and 93.1g water, stir well and then heat up to 40°C; control the dropping rate to 1ml / min, drop 2g acrylic acid and 0.9g sodium persulfate solution simultaneously respectively, react for 12 hours; obtain stable coagulant after being cooled to room temperature;

[0034] (2) Mix 65g 60-100 mesh aluminum sulfate, 0.1g 150-200 mesh aluminum hydroxide and 13.9g water, and cut for 3 hours with a high-speed disperser at a speed of 5000 rpm at room temperature; adjust the speed to 500 rpm, then add 15g of viscosity reducer and 1g of dispersant in turn, and shear for 5 minutes; keep at 500 rpm, add 5g of stable coagulant and shear for 5 minutes to obtain the final alkali-free accelerator.

Embodiment 3

[0036] The method for synthesizing fluorine-free and alkali-free quick-setting agent at normal temperature comprises the following steps:

[0037] (1) Mix 1g of 2-acrylamide-2-methylpropanesulfonic acid, 1g of N,N-dimethylacrylamide and 96.7g of water, stir evenly and then heat up to 50°C; control the dropping rate to 0.2ml / minute, drop 1g acrylic acid and 0.3g potassium persulfate solution simultaneously respectively, react 8 hours; Obtain stable coagulant after being cooled to room temperature;

[0038] (2) Mix 55g of 60-100 mesh aluminum sulfate, 0.1g of 150-200 mesh aluminum hydroxide and 13.9g of water, and use a high-speed disperser at room temperature to cut for 5 hours at a speed of 3000 rpm; adjust the speed to 100 rpm, then add 15g of viscosity reducer and 1g of dispersant in turn, and shear for 15 minutes; keep at 100 rpm, add 15g of stable coagulant and shear for 15 minutes to obtain the final alkali-free coagulant.

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Abstract

The invention discloses a method for synthesizing a fluorine-free and alkali-free accelerator at normal temperature. The preparation method of the present invention comprises: mixing aluminum sulfate, aluminum hydroxide and water, shearing for 3-8 hours at room temperature with a high-speed disperser at a speed of 1000-5000 rpm; in the sheared mixture Add viscosity reducer and dispersant in sequence, then adjust the speed of high-speed disperser to 50~500 rpm, and cut for 5~15 minutes; then add stable coagulant and cut for 5~15 minutes to obtain the final fluorine-free and alkali-free accelerator. The present invention prepares the non-alkali quick-setting agent into a suspended state by adopting the form of high-speed shearing, avoids the use of heat sources for heating, reduces the investment in heating equipment such as boilers, and reduces production costs; introduces a stable coagulant accelerator to improve the non-alkali quick-setting The stability and coagulation accelerator effect of the agent avoid the harm of fluoride ions to the human body and the impact on the durability of concrete.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, in particular to a method for synthesizing a fluorine-free and alkali-free accelerator at room temperature. Background technique [0002] Accelerator is a concrete admixture that makes cement or concrete set and harden quickly. Its main function is to increase the thickness of the first spraying of shotcrete, shorten the interval between the second spraying, and improve the early strength of concrete at the same time, so as to provide support resistance in time. It has been widely used in modern underground engineering, mining engineering, plugging and emergency rescue Wait for the project. Alkali-free accelerators have little effect on the strength of concrete in the later stage, and are becoming the main direction of accelerator development. Alkali-free accelerators with aluminum sulfate as the main component are easy to obtain raw materials and simple preparation processes. The m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/16C08F220/06C08F220/58C08F220/54C04B103/12
CPCC04B40/0039C08F220/06C08F220/58C08F220/54C04B2103/12C04B22/148C04B22/06C04B2103/408C04B24/163C04B24/122Y02W30/91
Inventor 王伟张小磊乔敏高南箫赵爽冉千平洪锦祥郭飞
Owner JIANGSU SOBUTE NEW MATERIALS