Hazardous chemical substance-free magnesium-aluminum fluoride system alkali-free setting accelerator without hazardous chemical substances and preparation method thereof

A technology of magnesium fluoride and accelerator, which is applied in the field of building materials, can solve problems such as lack of magnesium fluoride and aluminum compounds, impact on workers' health, and damage to workers' health, so as to achieve superior quick-setting effect, shorten initial setting and final setting. The coagulation time and the effect of sufficient component reaction

Active Publication Date: 2020-05-15
PANZHIHUA CITY JIYUAN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hydrofluoric acid or fluorosilicic acid will remain in the quick-setting agent, which will lead to the problem of low 1d strength of the mortar. In addition, because hydrofluoric acid or fluorosilicic acid is a hazardous chemical, it may be damaged during transportation, production, and on-site construction. Damage to the health of workers, especially the shotcrete construction environment is generally a poorly ventilated tunnel, and the spraying construction time is generally longer than 10 hours, and the residual hydrofluoric acid or fluosilicic acid will float in the air for a long time, which is harmful to the health of workers have a big impact
[0005] Existing patent CN10785750

Method used

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  • Hazardous chemical substance-free magnesium-aluminum fluoride system alkali-free setting accelerator without hazardous chemical substances and preparation method thereof
  • Hazardous chemical substance-free magnesium-aluminum fluoride system alkali-free setting accelerator without hazardous chemical substances and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A non-hazardous chemical-free magnesium-aluminum fluoride system alkali-free quick-setting agent, comprising the following components, calculated in parts by weight, 47 parts of aluminum sulfate, 6.5 parts of magnesium fluorosilicate, 2 parts of cryolite, and 10 parts of magnesium sulfate, 1 part of magnesium hydroxide, 0.1 part of polyethyleneimine, 2 parts of urea, 5 parts of diethanolamine, 26.5 parts of water.

[0047] Preparation:

[0048] S1: Mix and heat water, urea, magnesium hydroxide, polyethyleneimine and magnesium fluorosilicate to 40-45°C, and stir for 30 minutes;

[0049] S2: Put aluminum sulfate, magnesium sulfate and cryolite into S1, heat to 60-65°C, and stir for 30 minutes;

[0050] S3: pump diethanolamine into S2, and stir at a constant temperature of 60-65°C for 1.5 hours to obtain a non-hazardous chemical-free magnesium-aluminum fluoride system alkali-free accelerator.

Embodiment 2

[0052] A non-hazardous chemical-free magnesium-aluminum fluoride system alkali-free accelerator, comprising the following components, calculated in parts by weight, 47 parts of aluminum sulfate, 3 parts of magnesium fluorosilicate, 2 parts of cryolite, and 10 parts of magnesium sulfate, 1 part of magnesium hydroxide, 0.1 part of polyethyleneimine, 2 parts of urea, 5 parts of diethanolamine, 30 parts of water.

[0053] Preparation:

[0054] S1: Mix and heat water, urea, magnesium hydroxide, polyethyleneimine and magnesium fluorosilicate to 40-45°C, and stir for 30 minutes;

[0055] S2: Put aluminum sulfate, magnesium sulfate and cryolite into S1, heat to 60-65°C, and stir for 30 minutes;

[0056] S3: pump diethanolamine into S2, and stir at a constant temperature of 60-65°C for 1.5 hours to obtain a non-hazardous chemical-free magnesium-aluminum fluoride system alkali-free accelerator.

Embodiment 3

[0058] A non-hazardous chemical-free magnesium-aluminum fluoride system alkali-free accelerator, comprising the following components, calculated in parts by weight, 47 parts of aluminum sulfate, 8 parts of magnesium fluorosilicate, 5 parts of cryolite, and 10 parts of magnesium sulfate, 1 part of magnesium hydroxide, 0.1 part of polyethyleneimine, 2 parts of urea, 5 parts of diethanolamine, 25 parts of water.

[0059] Preparation:

[0060] S1: Mix and heat water, urea, magnesium hydroxide, polyethyleneimine and magnesium fluorosilicate to 40-45°C, and stir for 30 minutes;

[0061] S2: Put aluminum sulfate, magnesium sulfate and cryolite into S1, heat to 60-65°C, and stir for 30 minutes;

[0062] S3: pump diethanolamine into S2, and stir at a constant temperature of 60-65°C for 1.5 hours to obtain a non-hazardous chemical-free magnesium-aluminum fluoride system alkali-free accelerator.

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Abstract

The invention provides a hazardous chemical substance-free magnesium-aluminum fluoride system alkali-free accelerator which comprises the following components in parts by weight: 40-55 parts of aluminum sulfate, 0-15 parts of magnesium sulfate, 3-8 parts of magnesium fluosilicate, 0.5-1.5 parts of magnesium hydroxide, 0-8 parts of cryolite, 1-14 parts of amine compounds and 20-30 parts of water. According to the hazardous chemical substance-free magnesium-aluminum fluoride system alkali-free setting accelerator provided by the invention, the reaction system reaction can achieve the dissolutionreaction, and the prepared accelerator does not contain hydrofluoric acid and fluosilicic acid, so that harmful gas cannot be generated during the construction process, the influence of the harmful gas on the health of the construction personnel is avoided, the pollution of the harmful gas on the air is avoided, and the safety and the environmental protection are provided.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a non-hazardous chemical-free magnesium-aluminum fluoride system alkali-free accelerator and a preparation method thereof. Background technique [0002] Liquid accelerator is an admixture that can quickly set and harden the cement-containing binder and produce a certain strength. It is mainly used in wet sprayed concrete, and is widely used in high-speed rail, high-speed, subway tunnels and other projects. [0003] Liquid accelerators for wet shotcrete include alkali and non-alkali liquid accelerators. The main problems of alkali accelerators are high alkali content, large loss of 28d strength, strong corrosion and harm to operators. Healthy; the main problems of alkali-free accelerators are large dosage, short stable period, and low 1d strength. [0004] For the development of non-alkali liquid accelerators, fluoroaluminum complex liquids have rapid setting effects, ...

Claims

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Application Information

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IPC IPC(8): C04B24/12C04B103/12
CPCC04B40/0039C04B2103/12C04B22/148C04B22/142C04B22/126C04B22/066C04B24/121C04B24/126C04B24/122
Inventor 古朝建张毕军
Owner PANZHIHUA CITY JIYUAN TECH
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