Preparation method of alkali-free stable accelerator

An accelerator and alkali-stabilized technology, which is applied in the field of concrete materials, can solve the problems of low solid content, low stability, and low solubility of saturated solutions, and achieve the effects of improving solid content, breaking potential balance, and accelerating flocculation and coagulation

Inactive Publication Date: 2018-06-15
常州市协旺纺织品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention: Aiming at the problems of low solubility of the traditional aluminum sulfate accelerator material, low solid content of the prepared saturated solution, large dosage and low stability performance, a non-alkali stable accelerator is provided. Preparation

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  • Preparation method of alkali-free stable accelerator

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example 1

[0020] According to the mass ratio of 1:10, polyethylene glycol 400 was added to N,N-dimethylformamide, stirred and mixed to obtain a mixed solution, and in parts by weight, 45 parts of the mixed solution, 10 parts of 2- Acrylamido-2-methyl-1-propanesulfonic acid and 3 parts of ethyl 4-acetylacryloylacetate were placed in a three-necked flask, stirred and mixed to obtain a base liquid, and the air was vented with nitrogen, and the rate of nitrogen gas was controlled to be 45mL / min, under a nitrogen atmosphere, and then in parts by weight, take 45 parts of base liquid, 6 parts of 2,2'-azobisisobutyronitrile and 3 parts of polyethylene glycol 2000 in a beaker, at 65 ° C After heating in a water bath for 3 hours, let it stand and cool to room temperature to obtain a gel base liquid; take the soil with a pH of 8.5 and a moderate saline-alkali soil, mix it with deionized water at a mass ratio of 1:10, and let it stand for 3 hours. Centrifuge and separate for 10 min at 1 / min, colle...

example 2

[0022] Add polyethylene glycol 400 to N,N-dimethylformamide at a mass ratio of 1:10, stir and mix to obtain a mixed solution, and weigh 47 parts of the mixed solution and 12 parts of 2- Acrylamido-2-methyl-1-propanesulfonic acid and 4 parts of ethyl 4-acetylacryloylacetate were placed in a three-necked flask, stirred and mixed to obtain a base liquid, and the air was vented with nitrogen, and the rate of nitrogen gas was controlled to be 47mL / min, under a nitrogen atmosphere, and in parts by weight, take 47 parts of base liquid, 7 parts of 2,2'-azobisisobutyronitrile and 4 parts of polyethylene glycol 2000 in a beaker, at 67 ° C After heating in a water bath for 4 hours, let it stand and cool to room temperature to obtain a gel base liquid; take the soil with a pH of 8.5 and a moderate saline-alkali soil, mix it with deionized water at a mass ratio of 1:10, and let it stand for 4 hours. Centrifuge and separate for 12 min at 1 / min, collect the supernatant to obtain saline-alka...

example 3

[0024] Add polyethylene glycol 400 to N, N-dimethylformamide at a mass ratio of 1:10, stir and mix to obtain a mixed solution, and weigh 50 parts of the mixed solution and 15 parts of 2- Acrylamido-2-methyl-1-propanesulfonic acid and 5 parts of ethyl 4-acetylacryloylacetate were placed in a three-necked flask, stirred and mixed to obtain a base liquid, and the air was vented with nitrogen, and the rate of nitrogen gas was controlled to 50mL / min, under a nitrogen atmosphere, and then in parts by weight, take 50 parts of base liquid, 8 parts of 2,2'-azobisisobutyronitrile and 5 parts of polyethylene glycol 2000 in a beaker, at 80 ℃ After heating in a water bath for 5 hours, let it stand and cool to room temperature to obtain a gel base liquid; take the soil with a pH of 8.5 and a moderate saline-alkali soil, mix it with deionized water at a mass ratio of 1:10, and let it stand for 5 hours, then place it at 3000r Centrifuge for 15 min at 1 / min, collect the supernatant to obtain ...

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Abstract

The invention relates to a preparation method of an alkali-free stable accelerator and belongs to the technical field of concrete materials. Porous hydrogel is used as a carrier and is a three-dimensional network structure cross-linked polymer which has a main chain or a branched chain containing a large amount of hydrophilic groups and adsorbs a large amount of water. In the porous hydrogel, theporous structure greatly improves the swelling reduction rate of hydrogel, effectively improves the polymerization form of aluminum ions dispersed in the liquid, effectively improves the flocculationof aluminum ions into aluminum hydroxide, and effectively improves the stability of the composite accelerator. Through compounding of the polyaluminum sulfate and aluminum sulfate and improvement of the stability of the polymerized aluminum sulfate material, the composite material effectively improves the solid content of the accelerator, effectively improves accelerating effects of the accelerator on cement, breaks the potential balance on the surface of the cement particles and accelerates the flocculation and coagulation of the cement.

Description

technical field [0001] The invention relates to a preparation method of an alkali-free stable quick-setting agent, which belongs to the technical field of concrete materials. Background technique [0002] The first generation accelerator was developed and produced by Swiss and Austrian manufacturers, the main component is sodium silicate, and it has a history of nearly 100 years. Around the 1970s, a variety of accelerators appeared, and their main components were aluminates and carbonates of alkali metals. These coagulants with high alkali content are also known as traditional alkaline accelerators. Although the early accelerators can meet the requirements of rapid setting, they are found to reduce the strength of concrete after 28 days. About 65% of the concrete Strength retention. Aiming at the corrosiveness of the traditional alkaline accelerator itself and the impact on the later strength of shotcrete, a lot of research work has been done abroad since the late 1970s, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/32C04B103/12
CPCC04B40/0039C04B2103/12C04B22/002C04B22/148C04B24/32C04B24/124C04B24/16C04B24/045C04B24/129C04B14/361C04B24/14
Inventor 皮蒙蒋益
Owner 常州市协旺纺织品有限公司
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