Cement set retarder

A cement retarder and additive technology, applied in the field of cement retarders, can solve the problems of short retardation time and great influence on cement strength, and achieve the effects of prolonging retardation time, improving fluidity and improving crosslinking efficiency

Inactive Publication Date: 2018-11-16
王敏
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a cement retarder for the problem that the current cement retarder has a short retarding time and has a great influence on the strength of cement

Method used

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  • Cement set retarder

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0031] The preparation method of composite retarding component A comprises the steps:

[0032] (1) Take mica, Glauber's salt and diphenylmethane diisocyanate in a ball milling tank according to the mass ratio of 5:2~3:1, add zirconia ball milling beads according to the mass ratio of the ball to material 15~20:1, and heat at 5~10°C Ball milling at 300~350r / min for 3~5h to obtain ball milling materials for later use;

[0033] (2) In terms of parts by mass, take 10~15 parts of nano-calcium carbonate, 10~20 parts of linoleic acid, 8~20 parts of carbomer, and 35~50 parts of water and mix them in a container at a rate of 8~12mL / min Under argon protection, stir at 400-600r / min for 45-60min at 70-85°C, add a pH regulator to adjust the pH to neutral, and vacuum dehydrate at 50-70°C to obtain nano-calcium carbonate dispersion;

[0034] (3) According to the mass ratio of 3~5:4:3:15~20, take the spare ball mill, nano-calcium carbonate dispersion, phospholipid, and absolute ethanol and mi...

Embodiment 1

[0043] Auxiliary: Mix calcium carbide slag, red mud and water according to the mass ratio of 3:1:10, stir magnetically at 300r / min for 20min, add 30% of the mass of calcium carbide slag in H 2 o 2 Let it stand for 4 hours, filter, and take the filter residue and dry it in an oven at 60°C to obtain the additive.

[0044] Surfactant: sodium dodecylbenzenesulfonate.

[0045] Coating solution: Mix 10% acetic acid solution, chitosan, sodium carboxymethyl starch, and microcrystalline paraffin at a mass ratio of 10:1:3:1, and stir at 450r / min for 30 minutes to obtain the coating solution .

[0046] pH regulator: Mix sodium carbonate and NaOH solution with a concentration of 0.1mol / L at a mass ratio of 3:1 to obtain a pH regulator.

[0047] Glycoprotein liquid: in parts by weight, take 20 parts of bovine serum albumin, 0.1 part of trypsin, and 100 parts of water in turn, mix them at 40°C, stir at a constant temperature of 400r / min for 45min, heat up to 80°C, and keep warm to inacti...

Embodiment 2

[0061] Auxiliary: Mix calcium carbide slag, red mud and water at a mass ratio of 3:1:15, stir magnetically at 450r / min for 45min, add 55% of the mass of calcium carbide slag in H 2 o 2 Let it stand for 8 hours, filter, and take the filter residue and dry it in an oven at 75°C to obtain the additive.

[0062] Surfactant: Sodium Lauryl Sulfate.

[0063] Coating solution: Mix 10% acetic acid solution, chitosan, sodium carboxymethyl starch, and microcrystalline paraffin at a mass ratio of 15:1:3:1, and stir at 600r / min for 50min to obtain the coating solution .

[0064] pH regulator: Mix sodium carbonate and NaOH solution with a concentration of 0.1mol / L at a mass ratio of 5:1 to obtain a pH regulator.

[0065] Glycoprotein liquid: in parts by weight, take 30 parts of bovine serum albumin, 0.3 parts of trypsin, and 200 parts of water in sequence, mix them at 45°C, stir at a constant temperature of 500r / min for 60min, heat up to 95°C, and keep warm to inactivate the enzyme Afte...

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Abstract

The invention discloses a cement set retarder, and belongs to the field of buildings. The cement set retarder is characterized in that mica and mirabilite are respectively disaggregated by ball grinding, the surface of the disaggregated mica powder and the phospholipid molecules carry negative charges, the negative charges can generate electrostatic adsorption with positive-charge hydrophobic endin mucin of a glycoprotein liquid of a composite set retarding component B, and a double-parent type diaphragm consisting of phospholipid and glycoprotein is formed at the surface of the pretreated particle; under the existence condition of linoleic acid and phospholipid in the double-parent type diaphragm, the lubricating property of the cement set retarder is improved; the carbon dioxide in polyallylamine is slowly released, and acts between the diaphragm and the particles, a carbon dioxide gas layer is formed between the diaphragm and the particles, and the water is not in contact with theinternal particles; along with the degrading of the double-parent type diaphragm, the internal carbon dioxide gas layer is released, the contact angle between the cement particle and water is reduced,the set retarding time is extended, and the strength of the cement is improved. The cement set retarder solves the problems of short set retarding time in the existing cement set retarder and higherinfluence to the strength of the cement.

Description

technical field [0001] The invention belongs to the field of construction, and in particular relates to a cement retarder. Background technique [0002] Cement retarder is a kind of cement hydration reaction that can delay the cement hydration reaction, thereby prolonging the setting time of concrete, making fresh concrete maintain plasticity for a long time, facilitating pouring, improving construction efficiency, and at the same time, it will not cause adverse effects on various properties of concrete in the later stage admixtures. With the improvement of drilling technology and the increase of difficulty in oilfield production, drilling has developed into deep wells, ultra-deep wells, and complex wells, and the temperature and pressure at the bottom of the well have increased significantly. well construction requirements. In order to ensure the safety of construction, it is necessary to add a suitable retarder to the cement slurry so that the cementing operation can be ...

Claims

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Application Information

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IPC IPC(8): C04B24/26C04B103/22
CPCC04B40/0046C04B2103/22C04B18/0481C04B18/0409C04B22/068C04B14/20C04B22/147C04B14/28C04B24/20C04B24/125C04B24/085C04B24/2641C04B24/003C04B24/026C04B14/042C04B18/08C04B22/04C04B24/14C04B24/16
Inventor 王敏陈建春胡晓玉
Owner 王敏
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