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A kind of early-strength polycarboxylate water reducer and preparation method thereof

A technology of polycarboxylic acid and water reducing agent, applied in the field of concrete admixtures, can solve the problems of poor water solubility of unsaturated silane monomers, insufficient influence of the action process of polycarboxylic acid water reducing agent, etc., and achieves accelerated hydration speed. , the effect of reducing sensitivity and improving adaptability

Active Publication Date: 2022-03-18
JIANGSU SOBUTE NEW MATERIALS +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned patented method can introduce a small amount of silane groups into the molecule, which has insufficient influence on the action process of the polycarboxylate water reducer, and the water solubility of the unsaturated silane monomer is not good, and a heterogeneous reaction occurs during the polymerization of the aqueous solution. There is also a problem with volume conversion

Method used

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  • A kind of early-strength polycarboxylate water reducer and preparation method thereof
  • A kind of early-strength polycarboxylate water reducer and preparation method thereof
  • A kind of early-strength polycarboxylate water reducer and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0062] equipped with thermometer, stirrer and N 2 2400 g of A-1 (1 mol) was added to the glass reactor with the introduction tube, and the reaction vessel was purged with nitrogen gas while stirring, and the temperature was raised to 60° C. to dissolve. After the polyether is completely dissolved, accurately weigh 3.3 g of azobisisobutyronitrile, divide it into 3 parts, and add 1.1 g before starting the reaction, and stir evenly. 348g of B-1 (3mol) and 1.56g of mercaptoethanol were mixed and dripped into the reactor with a peristaltic pump for 2 hours. During the reaction process, 1.1 g of azobisisobutyronitrile was added every 60 minutes, and after the dropwise addition of the materials was completed, the mixture was incubated for 1 hour to obtain prepolymer 1 with a molecular weight of 114,000.

[0063] Raise the temperature of the material in the reaction flask to 120°C and continuously feed N 2 Deoxygenation, 708g E-1 (3mol) was added dropwise, and the dropwise addition ...

Embodiment 2

[0065] equipped with thermometer, stirrer and N 2Add 4000 g of A-2 (1 mol) into the glass reactor of the introduction tube, purging the reaction vessel with nitrogen while stirring, and raise the temperature to 70° C. to dissolve. After the polyether was completely dissolved, 18.6 g of azobisisoheptanonitrile was accurately weighed, divided into 4 parts, and 4.65 g was added before the reaction started, and stirred evenly. Mix 260g of B-2 (2mol), 88g of C-1 (1mol), 57g of D-1 (1mol) and 13.8g of mercaptopropanol, and drop them into the reactor with a peristaltic pump for 3 hours. During the reaction process, 4.65 g of azobisisobutyronitrile was added every 60 minutes, and after the dropwise addition of the materials was completed, the mixture was incubated for 1 hour to obtain prepolymer 2 with a molecular weight of 102,000.

[0066] Raise the temperature of the material in the reaction flask to 120°C and continuously feed N 2 Deoxygenation, 1108g E-2 (4mol) was added dropwi...

Embodiment 3

[0068] equipped with thermometer, stirrer and N 2 6500 g of A-3 (1 mol) was added to the glass reactor with the introduction tube, and the reaction vessel was purged with nitrogen gas while stirring, and the temperature was raised to 80° C. to dissolve. After the polyether is completely dissolved, accurately weigh 42.5g of benzoyl peroxide, divide it into 5 parts, and add 8.5g before the reaction starts, and stir evenly. Mix 130g B-3 (1mol), 232g C-2 (2mol), 142g D-2 (3mol) and 12.9g mercaptoacetic acid, and drop them into the reactor with a peristaltic pump for 4 hours. During the reaction process, 8.5 g of benzoyl peroxide was added every 60 minutes, and after the dropwise addition of the materials was completed, the reaction was incubated for 1 hour to obtain prepolymer 3 with a molecular weight of 85,000.

[0069] Raise the temperature of the material in the reaction flask to 120°C and continuously feed N 2 Deoxygenation, 1476g E-3 (6mol) was added dropwise, and the drop...

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Abstract

The invention discloses an early-strength polycarboxylate water-reducing agent and a preparation method thereof. The early-strength polycarboxylate water-reducing agent of the present invention is copolymerized by unsaturated reactive polyether and unsaturated comonomer with active hydrogen under water-free or solvent-free conditions, and then uses silane monomer It is prepared by ring-opening grafting of the epoxy groups contained in it with active hydrogen. The present invention introduces the silicon element that is the same as the cement component, and uses silane groups to completely replace the anionic groups as the adsorption groups of the polymer, thereby changing the electrical properties of the polycarboxylate water-reducing agent molecules and reducing the impact of the polycarboxylate water-reducing agent on The surface electrical sensitivity of the material can significantly improve the early strength of concrete and ensure that the later strength of the concrete does not shrink.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, and in particular relates to a polycarboxylate water-reducer capable of improving the early strength of concrete and a preparation method thereof. Meanwhile, the polymer has good material adaptability. Background technique [0002] The country's large-scale infrastructure and urbanization process is the general trend of development, and the construction industry will still be one of the industries that benefit the most, and the construction industrialization rate will also rapidly increase with the development of the construction industry. The construction of a series of major projects including large bridges, nuclear power, hydropower, and super high-rise buildings has put forward higher requirements for concrete. The difficulty of engineering construction is gradually increasing, and the construction environment is becoming more and more complex. In particular, the strength requirem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C04B24/26C04B24/42C08F220/20C08F216/14C08F226/02C04B103/30
CPCC04B24/2694C04B24/2605C04B40/0039C08F283/065C04B2103/302C08F220/20C08F216/1416C08F226/02C04B24/42
Inventor 周栋梁杨勇冉千平李申桐严涵刘金芝黄振张志勇
Owner JIANGSU SOBUTE NEW MATERIALS
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