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Early-strength polycarboxylate superplasticizer and preparation method and application thereof

A technology of polycarboxylic acid and water reducer, which is applied in the field of early-strength polycarboxylate water reducer and its preparation, can solve the problem of poor water solubility, shortened setting time, The environment is not environmentally friendly and other problems, and it is beneficial to the development of early strength, the shortening of setting time, and the effect of environmental protection

Active Publication Date: 2020-03-27
中科广化(重庆)新材料研究院有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the shortcoming is that the shortening of its setting time is not very good, and the chain transfer agent of ethylene glycol bisthioglycolate series is not good in water solubility, and its toxicity is relatively high. Secondly, its discharge is not environmentally friendly.

Method used

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  • Early-strength polycarboxylate superplasticizer and preparation method and application thereof
  • Early-strength polycarboxylate superplasticizer and preparation method and application thereof
  • Early-strength polycarboxylate superplasticizer and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Add 50mL of water and 24gA-1 to a 250mL four-necked flask equipped with a stirrer, a thermometer, a nitrogen gas inlet tube, and a dropping device, and raise the temperature to 50°C under the protection of nitrogen. After stirring evenly, dropwise add 0.16g of D- 1. The aqueous solution of 0.09g E-1, 1.1g F-1 (total mass fraction is 4.3Wt%) and the aqueous solution of 1.86g B-1, 0.54g C-1 (total mass fraction is 10.7Wt%), The dropping time is 3h and 2h respectively, and the reaction is kept for 1.5h after the dropping is completed. After the reaction, slowly cool down to 30°C, adjust the pH of the obtained product to about 6 with a 30% aqueous sodium hydroxide solution, cool to normal temperature, and dilute with water to obtain an early-strength polycarboxylate with a solid content of 10%. Aqua, labeled ES-PCE-1.

Embodiment 2

[0070] Add 50mL of water and 25.8g of A-1 to a 250mL four-neck flask equipped with a stirrer, a thermometer, a nitrogen gas inlet tube, and a dropping device, and raise the temperature to 60°C under the protection of nitrogen. After stirring evenly, dropwise add 0.16g of A-1 The aqueous solution of D-2, 0.09g E-1, 1.1g F-1 (total mass fraction is 4.3Wt%) and the aqueous solution of 1.86g B-2, 0.52g C-1 (total mass fraction is 10.6Wt%) ), the dropping time was 3.5h and 2.5h respectively, and the insulation reaction was 1.5h after the dropping was completed. After the reaction, slowly cool down to 30°C, adjust the pH of the obtained product to about 6 with a 30% sodium hydroxide solution, cool to normal temperature, and dilute with water to obtain an early-strength polycarboxylate with a solid content of 10%. Aqua, labeled ES-PCE-2.

Embodiment 3

[0072] Add 50mL of water and 13.5g of A-2 to a 250mL four-neck flask equipped with a stirrer, a thermometer, a nitrogen gas inlet tube, and a dropping device, and raise the temperature to 70°C under the protection of nitrogen. After stirring evenly, dropwise add 0.09g of A-2 The aqueous solution of D-1, 0.05g E-1, 0.80g F-1 (total mass fraction is 3.7Wt%) and the aqueous solution of 1.56g B-1, 0.57g C-1 (total mass fraction is 10.7Wt%) ), the dropping time is 3.5h and 3h respectively, and the insulation reaction is 1.5h after the dropping is completed. After the reaction, slowly cool down to 30°C, adjust the pH of the obtained product to about 6 with a 30% sodium hydroxide solution, cool to normal temperature, and dilute with water to obtain an early-strength polycarboxylate with a solid content of 10%. Aqua, labeled ES-PCE-3.

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Abstract

The invention belongs to the technical field of superplasticizers, and particularly discloses a preparation and an application of an early-strength polycarboxylate superplasticizer. The preparation comprises the following steps: (1) mixing polymerized dihydric alcohol and haloalkane carboxylic acid well in tetrahydrofuran, and carrying out esterification reaction to obtain dihaloalkane acid ester;dissolving the dihaloalkane acid ester and thiosulfate in water, adding inorganic acid and Zn for mixing, and performing substitution reaction to obtain the water-soluble dithiol macromolecular chaintransfer agent, namely, dithiol diester; and (2) mixing a polyether monomer A and water well, adding an aqueous solution containing a monomer B and a monomer C and an aqueous solution containing an initiator, a reducing agent and the dimercapto diester obtained in the step (1), carrying out a heat preservation reaction, and neutralizing the reaction solution after the reaction is completed to obtain the early strength polycarboxylate superplasticizer. The early-strength polycarboxylate superplasticizer prepared by the invention is applied to precast concrete, and can replace a complicated secondary curing process, so that the potential high risk of secondary curing is avoided, and the consumption of a large amount of steam and coal resources is avoided.

Description

technical field [0001] The invention belongs to the technical field of superplasticizers, in particular to an early-strength polycarboxylate water reducer and its preparation method and application. Background technique [0002] Polycarboxylate high-performance water reducer is widely used in the fields of ceramics, cement and gypsum products. It not only has an adsorption effect on positively charged particles, but also has a steric hindrance effect. For cement particles, the addition of polycarboxylic acid-based high-performance water reducers can increase the reaction contact surface between cement and mixing water, and increase the thickness of the hydration film in the early stage of hydration reaction, hindering the release of ions in cement particles, thereby It reduces the rate of hydration reaction and exhibits the effect of retarding the setting. [0003] However, in the production process of precast concrete components, the concrete is mixed and poured on site wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F222/02C08F222/06C08F220/58C08F228/02C08F2/38C04B24/16C04B35/634C04B103/30
CPCC08F283/065C08F2/38C04B24/165C04B35/6344C08F2438/03C04B2103/302C08F220/06C08F222/02C08F222/06C08F228/02
Inventor 庞浩喻培韬黄健恒梁利岩廖兵年福伟
Owner 中科广化(重庆)新材料研究院有限公司