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Polyether crosslinked concrete water reducer, and preparation method and application thereof

A concrete water-reducing agent and cross-linking technology, applied in the field of concrete additives, can solve the problems of poor cement adaptability, low water-reducing rate, and large dosage, and achieve the effects of high water-reducing rate, low cost, and low dosage.

Active Publication Date: 2014-02-19
GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the existing water reducing agents generally have defects such as large dosage, low water reducing rate, and poor cement adaptability.

Method used

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  • Polyether crosslinked concrete water reducer, and preparation method and application thereof
  • Polyether crosslinked concrete water reducer, and preparation method and application thereof
  • Polyether crosslinked concrete water reducer, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] At the bottom of the three-necked flask, add mass fraction of 0.9% initiator hydrogen peroxide aqueous solution 15g, methallyl alcohol polyoxyethylene ether 20g; crosslinking agent polyethylene glycol bis-itaconate monoester 0.23g, acrylic acid 4g, water 8g Prepare a monomer mixed solution, prepare a reducing agent-chain transfer agent mixed solution with 0.03 g of reducing agent ascorbic acid, 0.14 g of chain transfer agent thioglycolic acid, and 10 g of water; heat the reactor to 50 ° C, and use a peristaltic pump to simultaneously drop monomers Mixed solution and reducing agent-chain transfer agent mixed solution, the total time of dropping the monomer mixed solution is 2h, the monomer mixed solution is dripped before the reducing agent-chain transfer agent mixed solution 0.5h, and the reducing agent-chain transfer agent is mixed After the solution is added dropwise, react at a constant temperature for 3 hours; after the reaction is completed, after the product in the...

Embodiment 2

[0037] At the bottom of the three-necked flask, 10 g of hydrogen peroxide aqueous solution and 25 g of methallyl alcohol polyoxyethylene ether were added with a mass fraction of 1.8% initiator; g to prepare a monomer mixed solution, prepare a reducing agent-chain transfer agent mixed solution with 0.05 g of reducing agent ascorbic acid, 0.2 g of chain transfer agent mercaptopropionic acid, and 14.5 g of water; heat the reactor to 60 ° C, and use a peristaltic pump to drip Add the monomer mixed solution and the reducing agent-chain transfer agent mixed solution. The total time for the addition of the monomer mixed solution is 3 hours. The monomer mixed solution is dripped before the reducing agent-chain transfer agent mixed solution for 1 hour. React for 2 hours; after the reaction is completed, after the product in the reactor is cooled to room temperature, use a 30% NaOH solution to adjust its pH value to 6-8, add water to adjust the solid content to 40%, and obtain the polyet...

Embodiment 3

[0039] At the bottom of the three-necked flask, add mass fraction of 2.3% initiator hydrogen peroxide aqueous solution 25g, methallyl alcohol polyoxyethylene ether 30g; crosslinking agent polyethylene glycol bis-itaconate monoester 0.79g, acrylic acid 5.8g, water Prepare 9.5g of monomer mixed solution, prepare reducing agent-chain transfer agent mixed solution with 0.34g of reducing agent ascorbic acid, 0.42g of chain transfer agent mercaptopropionic acid, and 11.5g of water; heat the reactor to 70°C, and use a peristaltic pump to simultaneously Add the monomer mixed solution and the reducing agent-chain transfer agent mixed solution dropwise. The total time for dropping the monomer mixed solution is 2 hours. The monomer mixed solution is dropped 1.5 hours before the reducing agent-chain transfer agent mixed solution. After the reaction at constant temperature for 5 hours; after the reaction is completed, after the product in the reactor is cooled to room temperature, adjust it...

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Abstract

The invention belongs to the field of concrete additives, and discloses a polyether crosslinked concrete water reducer, and a preparation method and an application thereof. The preparation method comprises the following steps: adding an aqueous solution of an initiator and methallyl alcohol polyoxyethylene ether into a reactor; heating the reactor to 50-100DEG C, simultaneously adding a monomer mixed solution and a reducing agent-chain transferring agent mixed solution in a dropwise manner for 2-5h and [(2-5)-(0.5-1.5)]h respectively, and carrying out a constant temperature reaction for 1-5h after the dropwise addition of the reducing agent-chain transferring agent mixed solution is finished; and cooling a product in the reactor to room temperature after the ending of the constant temperature reaction, and adjusting the pH value to 6-8 by using an NaOH solution to obtain the polyether crosslinked concrete water reducer. The polyether crosslinked concrete water reducer prepared by using polyethylene glycol diitaconic acid monoester as a crosslinking agent has the advantages of low admixture amount, good dispersibility, high water reducing rate, high compressive strength and good slump keeping performance.

Description

technical field [0001] The invention belongs to the field of concrete additives, and in particular relates to a polyether cross-linked concrete water reducer and its preparation method and application. Background technique [0002] Cement is usually adsorbed on the surface of hydrated and unhydrated cement particles, or encapsulated in cement hydration products, and part of the hyperdispersant molecules that are free in the water phase gradually decrease. When hydrating for about 1 hour, the concentration of hyperdispersant molecules in the liquid phase is getting lower and lower, and the hyperdispersant molecules wrapped in the cement cannot be released in time, and the fluidity of cement becomes poor. Compared with ordinary concrete hyperdispersants, cross-linked concrete hyperdispersants have high slump retention, which is mainly due to the introduction of long-chain ester crosslinking agents in the molecular structure. Under the alkaline environment of cement, the ester ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/32C08F283/06C08F220/06C08F2/38C04B103/30
Inventor 廖兵刘海露庞浩郑景新黄健恒程劲松梁潇
Owner GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI
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