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Clay inhibitor combined with polycarboxylic water reducer for use

A technology of clay inhibitor and water reducing agent, which is applied in the field of preparation of clay inhibitor, can solve the problems of rising air content, adverse effect on later strength, prolonging of concrete setting time, etc.

Active Publication Date: 2014-04-16
JIANGSU SOBUTE NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a large amount of retarder is likely to prolong the setting time of concrete, and it is easy to cause an increase in air content, which will adversely affect the later strength.

Method used

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  • Clay inhibitor combined with polycarboxylic water reducer for use
  • Clay inhibitor combined with polycarboxylic water reducer for use
  • Clay inhibitor combined with polycarboxylic water reducer for use

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] In a 1L glass round-bottomed flask equipped with a thermometer, a stirrer, a dropping funnel and a nitrogen conduit, add 400 g of distilled water, stir to raise the temperature, and purge the round-bottomed flask with nitrogen to get rid of the oxygen in the system. Under the protection of nitrogen, the temperature was raised to 90°C, and then 45.8g of monomer a-1, 12.3g of monomer a-2, 27.2g of monomer b-1, 9.3g of monomer c-1, 0.48g of 3-mercaptopropionic acid Mix and stir with 200g of water to form a homogeneous monomer aqueous solution, and drop it into a round bottom flask at a constant speed for 5 hours. At the same time, an aqueous initiator solution prepared by 205 g of distilled water and 1.8 g of potassium persulfate was added dropwise at a constant speed for 5.5 hours. After adding all the solutions dropwise, keep the constant temperature for 6 hours, then cool down to about 40°C and discharge to obtain the clay modifier PA-1 with a solid content of 10.5%.

Embodiment 2

[0039] In a 1L glass round-bottomed flask equipped with a thermometer, a stirrer, a dropping funnel and a nitrogen conduit, add 300 g of distilled water, stir to raise the temperature, and purge the round-bottomed flask with nitrogen to remove the oxygen in the system. Under the protection of nitrogen, the temperature was raised to 80°C, and then 165.4g of monomer a-2, 17.6g of monomer b-2, 2.4g of monomer c-2, 3.5g of thioglycolic acid and 250g of water were mixed and stirred to form a uniform single The aqueous solution was added dropwise to the round bottom flask at a constant speed for 4 hours. At the same time, an aqueous initiator solution prepared by 164 g of distilled water and 1.2 g of azobisisobutylamidine hydrochloride was added dropwise at a constant speed for 4.5 hours. After adding all the solutions dropwise, continue to keep constant temperature for 5 hours, then cool down to about 40°C and discharge to obtain clay modifier PA-2 with a solid content of 20.6%.

Embodiment 3

[0041] In a 1L glass round-bottomed flask equipped with a thermometer, a stirrer, a dropping funnel and a nitrogen conduit, add 300 g of distilled water, stir to raise the temperature, and purge the round-bottomed flask with nitrogen to remove the oxygen in the system. Under nitrogen protection, the temperature was raised to 50°C, and then 113.6g of monomer a-3, 7.5g of monomer b-3, 21.1g of monomer c-1, 1.7g of 2-mercaptopropionic acid, 0.35g of sodium bisulfite and 250g of water was mixed and stirred to form a homogeneous monomer aqueous solution, which was added dropwise into a round bottom flask at a constant speed for 2 hours. At the same time, an aqueous initiator solution prepared by 207 g of distilled water and 1.73 g of potassium persulfate was added dropwise at a constant speed for 2.5 hours. After the dropwise addition of the whole solution, continue to keep the constant temperature for 6 hours, then cool down to about 40°C and discharge the material to obtain the c...

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Abstract

The invention provides a clay inhibitor combined with a polycarboxylic water reducer for use, which comprises cationic nitrogen-containing low molecular weight copolymers; a preparation method of the clay inhibitor comprises the following step: a quaternary ammonium cationic monomer a, a monomer b containing primary amine, secondary amine or tertiary amine and a cross-linking monomer c are subjected to free radical copolymerization reaction in an aqueous solution, so that the clay inhibitor is obtained. Under the condition of relatively high mud content, the clay inhibitor can effectively ensure or improve the initial dispersive capacity and dispersion maintaining capability of the polycarboxylic water reducer, and meanwhile, the setting time, gas content, strength and other properties of concrete are not affected.

Description

technical field [0001] The invention relates to the field of preparation of concrete water-reducer additives, in particular to a preparation method of a clay inhibitor compounded with a polycarboxylate water-reducer. Background technique [0002] In recent years, the scale of major national projects has been huge, and the amount of concrete used has accounted for more than 50% of the world's total. As a high-performance concrete admixture, polycarboxylate superplasticizer has gradually been widely used in many engineering constructions due to its advantages such as low dosage, high water reducing rate, excellent slump performance, low shrinkage, energy saving and environmental protection. However, with the advancement of engineering construction, high-quality sand and gravel resources for concrete are increasingly scarce, especially in remote and arid areas, where it is impossible to effectively clean sand and gravel aggregates, which has gradually increased the mud content ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/12
Inventor 冉千平杨勇刘加平毛永琳刘金芝张建纲
Owner JIANGSU SOBUTE NEW MATERIALS
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