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High-dispersity slow-release calcium-aluminum-based chloride ion curing agent and preparation method thereof

A high-dispersibility, slow-release technology, applied in the field of concrete, to achieve the effect of eliminating negative effects, high dispersibility, and improving stability

Active Publication Date: 2022-05-10
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a highly dispersible slow-release calcium-aluminum-based chloride ion curing agent and its preparation method for the above-mentioned deficiencies in the prior art, which can make the coating material more distributed on the surface of the curing agent Uniform, solves the problem of poor coating effect caused by easy agglomeration in the preparation of existing capsule-type chloride ion curing agents, and has a more excellent ability to slowly release and cure chloride ions

Method used

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  • High-dispersity slow-release calcium-aluminum-based chloride ion curing agent and preparation method thereof
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  • High-dispersity slow-release calcium-aluminum-based chloride ion curing agent and preparation method thereof

Examples

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Embodiment 1

[0034] A kind of highly dispersible slow-release calcium-aluminum-based chloride ion curing agent, the specific preparation method is as follows:

[0035] 1) Add 10 parts by weight of gelatin and 100 parts by weight of water into a three-necked flask, heat and stir in a constant temperature water bath at 65°C for 3 hours to obtain gelatin colloid;

[0036] 2) 40 parts by weight of calcium-aluminum-based chlorine-fixing material (CaAl-NO 3 ), 3 parts by weight of N-maleylated gelatin type polycarboxylate superplasticizer and 500 parts by weight of water were added to the wet mill, and wet milled at a rate of 600rpm at 20°C for 2h, wherein the ball-to-material ratio was 5:1 The gradation of zirconia grinding balls is 3mm:1mm:0.5mm=1:5:4 (mass ratio);

[0037] 3) Add the gelatin colloid obtained in step 1) into a wet mill, adjust the wet milling temperature to 65°C, and continue wet milling for 1 hour under the condition that other wet milling process conditions remain unchanged...

Embodiment 2

[0044] A kind of highly dispersible slow-release calcium-aluminum-based chloride ion curing agent, the specific preparation method is as follows:

[0045] 1) Add 15 parts by weight of gelatin and 80 parts by weight of water into a three-necked flask, heat and stir in a constant temperature water bath at 65°C for 5 hours to obtain gelatin colloid;

[0046] 2) 50 parts by weight of calcium-aluminum-based chlorine-fixing material (CaAl-NO 3 , AFm, C 3 A is mixed according to the mass ratio of 1:1:1), 5 parts by weight of N-maleoylated gelatin type polycarboxylate water reducer and 800 parts by weight of water are added to the wet mill, and wet milled at 900rpm at 30°C 3h, wherein the ball-to-material ratio is 10:1, and the zirconia grinding ball gradation is 3mm:1mm:0.5mm=1:3:6 (mass ratio);

[0047] 3) Add the gelatin colloid obtained in step 1) into a wet mill, adjust the wet milling temperature to 65°C, and continue wet milling for 2 hours under the condition that other wet ...

Embodiment 3

[0063] The highly dispersible slow-release calcium-aluminum-based chloride ion curing agent prepared in Examples 1 and 2 was mixed into the cement slurry, and the mixing of two kinds of high-dispersibility slow-release calcium-aluminum-based chloride ion curing agents in the cement slurry The amount accounts for 4% and 5% of the mass of the gel material respectively. The composition and mass ratio of the cement slurry are shown in Table 3. The preparation of the cement slurry complies with the national standard GB / T1346-2011 "Cement Standard Consistency Water Consumption, Setting Time , Stability Test Method", and the sample mixed with calcium-aluminum-based chlorine-fixing material was used as a control group (the curing agent of blank group 1 was CaAl-NO 3 , the curing agent of blank group 2 is CaAl-NO 3 , AFm, C 3 A is obtained by mixing at a mass ratio of 1:1:1), the control blank group and the embodiment are mixed with the same ratio of calcium-aluminum-based chlorine-fi...

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Abstract

The invention relates to a high-dispersity slow-release calcium-aluminum-based chloride ion curing agent and a preparation method thereof.The preparation method of the chloride ion curing agent comprises the following steps that 1, gelatin and water are added into a three-neck flask, and heating and stirring are conducted to obtain gelatin colloid; and 2) adding the calcium-aluminum-based chlorine fixation material, an N-maleoyl gelatin type polycarboxylic acid water reducer and water into a wet mill for primary wet milling, then adding gelatin colloid for secondary wet milling, cooling the obtained wet milling product to obtain gel, then carrying out vacuum freeze drying, and then grinding and sieving to obtain the high-dispersity slow-release calcium-aluminum-based chloride ion curing agent. The chloride ion curing agent provided by the invention can increase the spatial sites of gelatin on the surface of a chloride ion curing material, significantly improve the dispersity of the chloride ion curing material, solve the common agglomeration problem in the existing chloride ion curing agent capsule coating technology, and have the working advantages of high efficiency and stability when being used as a cement-based material admixture; the early-stage working performance is more stable, and the later-stage chloride ion curing capacity is improved more remarkably.

Description

technical field [0001] The invention belongs to the technical field of concrete using inorganic materials as active ingredients, and in particular relates to a highly dispersed slow-release calcium-aluminum-based chloride ion curing agent and a preparation method thereof. Background technique [0002] With the gradual development of marine engineering construction, the shortage of global construction sand resources has become increasingly prominent. The rich sea sand resources along the coast have become the focus of many scholars. If they can be developed and utilized on a large scale, it will significantly reduce the cost of sand transportation for offshore engineering and effectively alleviate the pressure of the shortage of inland river sand resources. However, sea sand contains excessive chloride ions, and if it is used as aggregate in reinforced concrete, it will intensify the electrochemical corrosion reaction of steel bars, cause steel bars to corrode, and destroy th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/16C04B24/14
CPCC04B40/0046C04B24/14C04B22/085C04B24/163C04B22/002
Inventor 谭洪波吕周岭蹇守卫贺行洋苏英刘晓海陈偏
Owner WUHAN UNIV OF TECH
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