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Amphoteric monomer and amphoteric polycarboxylic acid water reducer

A technology of amphoteric monomers and water reducers, which is applied in the preparation of sulfonate, chemical instruments and methods, and the preparation of amino hydroxyl compounds. It can solve the corrosion of reinforced concrete and other problems, and achieve the elimination of rust. The synthesis process is simple and the reaction conditions are mild. Effect

Inactive Publication Date: 2019-09-06
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 cationic monomers used to synthesize amphoteric polycarboxylate water reducers in the above-mentioned documents are mainly chloride-ion-containing monomers, such as acryloyloxyethyltrimethylammonium chloride, methacryloyloxyethyltrimethylammonium chloride Ammonium chloride, but this type of monomer may cause corrosion of reinforced concrete due to the introduction of chloride ions

Method used

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  • Amphoteric monomer and amphoteric polycarboxylic acid water reducer
  • Amphoteric monomer and amphoteric polycarboxylic acid water reducer

Examples

Experimental program
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Effect test

Embodiment 1

[0041] A preparation method of an amphoteric monomer, comprising the steps of:

[0042] (1) Preparation of 6-dimethylaminohexyl methacrylate intermediate

[0043] Add 21.9732g of 6-dimethylamino-1-hexanol and 100mL of ether into a three-neck round bottom flask; control the reaction temperature at 0°C; add 12.3403g of methacryloyl chloride dropwise into the reaction flask for 40min, and then After reacting for 3 hours, stop the reaction; wash the oil layer with deionized water for 3 times, then add a desiccant anhydrous calcium chloride to dry overnight, and the filtrate is rotary evaporated at 35°C to remove the organic solvent ether; to obtain methacrylic acid-6-di The methylaminohexyl ester intermediate is standby;

[0044] (2) Preparation of Amphoteric Monomer

[0045] Add 2.7670g of 6-dimethylaminohexyl methacrylate intermediate, 0.0390g of hydroquinone and 30mL of acetone into a three-neck round bottom flask, stir and dissolve; rise to the reaction temperature of 50°C; ...

Embodiment 2

[0047] A preparation method of an amphoteric monomer, comprising the steps of:

[0048] (1) Preparation of 6-dimethylaminohexyl methacrylate intermediate

[0049] Add 11.0719g of 6-dimethylamino-1-hexanol and 70mL of diethyl ether into a three-neck round bottom flask; control the reaction temperature at 5°C; add 6.2734g of methacryloyl chloride dropwise into the reaction flask for 60min, and then After reacting for 4 hours, stop the reaction; wash the oil layer with deionized water for 3 times, then add a desiccant anhydrous calcium chloride to dry overnight, and the filtrate is rotary evaporated at 35°C to remove the organic solvent ether; to obtain methacrylic acid-6-di The methylaminohexyl ester intermediate is standby;

[0050] (2) Preparation of Amphoteric Monomer

[0051]Add 5.4956g of 6-dimethylaminohexyl methacrylate intermediate, 0.0652g of hydroquinone and 50mL of acetone into a three-neck round bottom flask, stir and dissolve; rise to a reaction temperature of 50°...

Embodiment 3

[0053] A preparation method of an amphoteric monomer, comprising the steps of:

[0054] (1) Preparation of 6-dimethylaminohexyl methacrylate intermediate

[0055] Add 7.2653g of 6-dimethylamino-1-hexanol and 50mL of ether into a three-neck round bottom flask; control the reaction temperature at 5°C; add 5.225g of methacryloyl chloride dropwise into the reaction flask for 60min, and then After reacting for 4 hours, stop the reaction; wash the oil layer with deionized water for 3 times, then add a desiccant anhydrous calcium chloride to dry overnight, and the filtrate is rotary evaporated at 35°C to remove the organic solvent ether; to obtain methacrylic acid-6-di The methylaminohexyl ester intermediate is standby;

[0056] (2) Preparation of Amphoteric Monomer

[0057] Add 6.4950g of 6-dimethylaminohexyl methacrylate intermediate, 0.0732g of hydroquinone and 50mL of acetone into a three-neck round-bottomed flask, stir and dissolve; rise to the reaction temperature of 50°C; di...

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Abstract

The invention discloses an amphoteric monomer and an amphoteric polycarboxylic acid water reducer synthesized by the same. A preparation method of the amphoteric monomer includes the following steps:mixing 6-dimethylamino-1-hexanol with an organic solvent, dropping methacrylic chloride, washing an oil layer with deionized water, and removing the organic solvent to obtain a 6-dimethylaminohexyl methacrylate intermediate; mixing the 6-dimethylaminohexyl methacrylate intermediate with a polymerization inhibitor and the organic solvent, dropping a propane sultone drop concentrate, and performinga reaction for 16-28 hours; and extracting, washing and vacuum-drying an obtained crude product to obtain the amphoteric monomer. The amphoteric polycarboxylic acid water reducer is prepared by the prepared amphoteric monomer, an unsaturated carboxylic acid monomer and an unsaturated polyether macromonomer by an aqueous solution free radical polymerization method, which eliminates the corrosion ofchloride ions to reinforced concrete and has better dispersibility to cement at low dosage compared with a common anionic polycarboxylic acid water reducer.

Description

technical field [0001] The invention belongs to the field of polycarboxylate water reducers, and in particular relates to an amphoteric monomer and an amphoteric polycarboxylate water reducer synthesized therefrom. Background technique [0002] Polycarboxylate superplasticizer has the advantages of low dosage, high water reducing rate, good slump retention, good dispersion performance, strong molecular structure adjustability and environmental protection, and is widely used in concrete engineering. Most of the polycarboxylate superplasticizers currently on the market are anionic polycarboxylate superplasticizers. There are obvious defects in aspects such as , adaptability and stability, and researchers in related fields at home and abroad have begun to pay attention to amphoteric polycarboxylate superplasticizers. [0003] The amphoteric polycarboxylate superplasticizer is the same as the anionic polycarboxylate superplasticizer, and its molecular structure is comb-shaped. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C303/32C07C309/14C08F283/06C08F220/38C08F220/06C04B24/16C04B103/30
CPCC04B24/166C04B2103/302C07C213/06C07C303/32C08F283/065C07C219/08C07C309/14C08F220/06
Inventor 庞浩张静斐廖兵黄健恒蒙业云李思敏林秀菊
Owner 中科广化(重庆)新材料研究院有限公司
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