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Enhanced polycarboxylate superplasticizer and preparation method thereof

A technology of polycarboxylate and water reducer, which is applied in the field of concrete admixture, can solve the problems of poor water solubility of unsaturated silane monomer and insufficient influence of polycarboxylate water reducer on the action process, and achieve favorable dispersion ability , Increase the late strength of concrete, increase the effect of material adaptability

Active Publication Date: 2020-06-30
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 superplasticizer, and the water solubility of the unsaturated silane monomer is not good. When the aqueous solution is polymerized, a heterogeneous reaction occurs, and the monomer There is also a problem with the conversion rate

Method used

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  • Enhanced polycarboxylate superplasticizer and preparation method thereof
  • Enhanced polycarboxylate superplasticizer and preparation method thereof
  • Enhanced polycarboxylate superplasticizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] equipped with thermometer, stirrer and N 2 3000 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 2.46 g of azobisisobutyronitrile, divide it into 5 parts, add 0.49 g before the reaction starts, and stir evenly. 144g of B-1 (2mol) and 1.172g of mercaptoethanol were mixed and dripped into the reactor with a peristaltic pump for 5 hours. During the reaction process, 0.49 g of azobisisobutyronitrile was added every 75 minutes, and after the addition of the materials was completed, the mixture was incubated for 1 hour to obtain prepolymer 1 with a molecular weight of 118,000.

[0055] Raise the temperature of the material in the reaction flask to 100°C and continuously feed N 2 Carry out water, add catalyst p-toluenesulfonic acid 71.72g, dropwise add 442g C-1 (2mol...

Embodiment 2

[0057] equipped with thermometer, stirrer and N 2 Add 5000 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 is completely dissolved, accurately weigh 21.6g of potassium persulfate, divide it into 4 parts, add 5.4g before the reaction starts, and stir evenly. Mix 258g of B-1 (3mol) and 7.74g of mercaptopropanol, and drop them into the reactor with a peristaltic pump for 4 hours. During the reaction process, 5.4 g of potassium persulfate was added every 80 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 94,000.

[0058] Raise the temperature of the material in the reaction flask to 100°C and continuously feed N 2 Water was carried out, 110.53 g of catalyst p-toluenesulfonic acid was added, and 268.5 g of C-2 (1.5 mol) was add...

Embodiment 3

[0060] equipped with thermometer, stirrer and N 2 Into the glass reactor of the pipe, add 6500g A-3 (1mol), while stirring, purging the reaction vessel with nitrogen gas, divide 464g B-3 (4mol) into 3 equal parts, add 154.7g before the reaction starts, and Heat up to 80°C to dissolve. After the material is completely dissolved, accurately weigh 49.67 g of azobisisoheptanonitrile, divide it into 4 parts, and add 12.4 g before the reaction starts, and stir evenly. 19.8g of thioglycolic acid was dripped into the reactor with a peristaltic pump, and the dropping time was 3 hours. During the reaction, 154.7 g of B-3 and 12.4 g of azobisisoheptanonitrile were added every 60 minutes. After the addition of thioglycolic acid was completed, 12.4 g of azobisisoheptanonitrile was added, and the mixture was incubated for 1 hour to obtain prepolymer 3 with a molecular weight of 73,500.

[0061] Raise the temperature of the material in the reaction flask to 100°C and continuously feed N ...

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Abstract

The invention discloses an enhanced polycarboxylate superplasticizer and a preparation method thereof. The enhanced polycarboxylate superplasticizer disclosed by the invention is prepared by copolymerizing an unsaturated reactive polyether and an unsaturated comonomer with a carboxylic acid group or anhydride under the condition of no water or no solvent and then carrying out acylation reaction onamino groups contained in a silane monomer with carboxyl or anhydride. According to the invention, the silicon element with the same components as cement is introduced into molecules of the polycarboxylate superplasticizer; replacing an anionic group with a silane group to serve as an adsorption group of the polymer is adopted, therefore, the electrical property of the molecules of the polycarboxylate superplasticizer is changed, the sensitivity of the polycarboxylate superplasticizer due to the electrical property of the surface of the material is reduced, the dispersion and dispersion retention properties of the polycarboxylate superplasticizer and the adaptability to the material are improved, and an obvious reinforcing effect is achieved on concrete.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, and in particular relates to a polycarboxylate water reducer which can obviously improve the compressive strength of concrete when applied and a preparation method thereof. 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 requirements of high-performance conc...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F8/42C04B24/42C04B103/30
CPCC08F283/065C08F8/42C04B24/42C04B2103/302C08F220/06Y02W30/91
Inventor 杨勇周栋梁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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