Fluorine-free high-early-strength liquid alkali-free accelerator as well as preparation method and application thereof

A technology of quick-setting agent and early-strength agent, which is applied in the field of building material additives, can solve the problems of low-dosage quick-setting effect, hinder C3 hydration, and high-dosage problems, achieve green production costs, shorten the hydration incubation period, and improve the preparation process simple effect

Active Publication Date: 2022-04-29
SHANXI SUNWAY INTION TRADE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the liquid alkali-free accelerators currently on the market still have poor stability, high dosage, low 1d compressive strength, excessive alkali content, and the use of hydrofluoric acid (HF), fluorosilicic acid (H2SiF6) or fluorosilicate and other fluorine-containing toxic raw materials, etc.
Patent CN 201210495755.4 discloses a liquid alkali-free accelerator whose main components are aluminum sulfate, magnesium sulfate and magnesium fluorosilicate. The introduction makes it easy to form CaF ...

Method used

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  • Fluorine-free high-early-strength liquid alkali-free accelerator as well as preparation method and application thereof
  • Fluorine-free high-early-strength liquid alkali-free accelerator as well as preparation method and application thereof
  • Fluorine-free high-early-strength liquid alkali-free accelerator as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0054] This embodiment provides a fluorine-free high early strength liquid alkali-free accelerator and its preparation method, the specific details are as follows:

[0055] S1: Preparation of complexation activator:

[0056] S11: 35 parts by weight of acrylamide, 10 parts by weight of vinyltriethoxysilane, 47.5 parts by weight of sodium p-styrenesulfonate, 2.5 parts by weight of sodium methacrylsulfonate, 2.0 parts by weight of persulfuric acid Add ammonium and 300 parts by weight of deionized water into the reactor, stir to dissolve and heat up to 40°C;

[0057] S12: Add a mixed solution of 0.5 parts by weight of sodium bisulfite and 50 parts by weight of deionized water dropwise at a uniform speed for 1 hour, continue to react for 1 hour after the addition, cool down to room temperature, and add 60 parts by weight of deionized water water to obtain a complexation activator at a concentration of 20% by weight.

[0058] The complexation activator obtained in Example 1 is car...

Embodiment 2

[0065] This embodiment provides a fluorine-free high early strength liquid alkali-free accelerator and its preparation method, the specific details are as follows:

[0066] S1: Synthesis of complexation activator:

[0067] S11: Bottom solution: 30 parts of N,N-dimethylacrylamide + 7.5 parts of 3-methacryloxypropyltrimethoxysilane + 62.5 parts of 2-acrylamide-2-methylpropanesulfonic acid + over 1.0 parts of ammonium sulfate + 300 parts of deionized water, initial reaction temperature: 30°C;

[0068] S12: Dropping solution: 0.25 parts of vitamin C + 50 parts of deionized water, adding time of 0.5 hours, reaction time of 2 hours; add 55 parts of deionized water, and get a complexing activator with a concentration of 20% after cooling down to room temperature .

[0069] The complexation activator prepared in embodiment 2 is carried out infrared spectrum (IR) detection, as figure 1 As shown, at ~2910cm -1 、~1354cm -1 Nearby - CH 3 Characteristic absorption peak at ~1404cm -1...

Embodiment 3

[0074] This embodiment provides a fluorine-free high early strength liquid alkali-free accelerator and its preparation method, the specific details are as follows:

[0075] S1: Synthesis of complexation activators:

[0076] S11: Bottom solution: 20 parts of N-methylolacrylamide + 5 parts of vinyltriacetoxysilane + 72.5 parts of 2-acrylamide-2-methylpropanesulfonic acid + 2.5 parts of sodium methacrylsulfonate + over 1.5 parts of ammonium sulfate + 300 parts of deionized water, initial reaction temperature: 30°C;

[0077] S12: Dropping solution: 0.3 parts of white block + 50 parts of deionized water, adding time of 0.5 hours, reaction time of 1.5 hours; add 55 parts of deionized water, and get a complex excitation with a concentration of 20% after cooling down to room temperature agent.

[0078] The complexation activator obtained in Example 3 is carried out to gel permeation chromatography (GPC) detection, the synthetic complexation activator polymer molecular weight distrib...

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Abstract

The invention provides a fluoride-free liquid alkali-free accelerator as well as a preparation method and application thereof. The fluoride-free liquid alkali-free accelerator comprises the following raw materials in parts by weight: 450-600 parts of aluminum sulfate, 5-20 parts of a stabilizer, 25-150 parts of an organic complexing activator, 20-100 parts of alcohol amine, 0-10 parts of organic alcohol, 10-75 parts of an early strength agent, 0-10 parts of a neutralizer and deionized water. Wherein the organic complexing exciting agent is a high-molecular multipolymer which is obtained by carrying out redox initiation polymerization on unsaturated amide, unsaturated silane and unsaturated sulfonic acid monomers. The liquid alkali-free accelerator provided by the invention has the characteristic of rapid development of compressive strength in 6h and 1d, has the characteristics of no fluorine and chlorine, good stability, low mixing amount, fast coagulation, high later strength retention rate and the like, and can be widely applied to engineering construction such as railway tunnel and mine roadway support, repair and reinforcement, water prevention and leakage stoppage and the like.

Description

technical field [0001] The invention relates to the technical field of building material additives, in particular to a fluorine-free high-early-strength liquid alkali-free accelerator, a preparation method and application. Background technique [0002] With the massive construction of traffic tunnels, mine roadway support, repair and reinforcement, and waterproof and plugging projects, accelerators with rapid setting and hardening functions have become indispensable admixtures for modern shotcrete. At present, the liquid accelerators used in wet shotcrete are mainly alkali accelerators and alkali-free accelerators. Although the traditional alkaline accelerator can meet the construction requirements of shotcrete, it is easy to cause alkali-aggregate reaction due to its high alkali content and strong corrosiveness, resulting in large strength loss in the later stage, poor durability, high spray rebound, and serious dust pollution. and many other issues. Liquid alkali-free ac...

Claims

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Application Information

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IPC IPC(8): C04B24/42C08F212/14C08F220/56C08F230/08C08F228/02C08F220/58C08F220/54C04B103/10
CPCC04B40/0039C08F212/30C08F220/585C04B2103/10C08F220/56C08F230/085C08F228/02C08F220/54C04B24/122C04B24/02C04B22/148C04B24/42C04B22/142C04B14/104C04B22/06C04B14/042C04B22/00C04B22/066
Inventor 徐忠洲王宏维王英维
Owner SHANXI SUNWAY INTION TRADE CO LTD
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