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A kind of amide functional monomer and preparation method thereof, amphoteric polycarboxylate water reducer and preparation method thereof

A technology of functional monomer and water reducing agent, applied in the field of amide functional monomer and its preparation, amphoteric polycarboxylate water reducing agent and its preparation field, can solve the problems of accelerating the corrosion of reinforced concrete, reducing the service life of concrete, etc. Solve the problem of rust, improve the anti-carbonation performance, improve the effect of adaptability

Active Publication Date: 2022-07-05
KZJ NEW MATERIALS GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the quaternary ammonium salt cationic active monomer contains halogen ions, which accelerates the corrosion of reinforced concrete and reduces the service life of concrete

Method used

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  • A kind of amide functional monomer and preparation method thereof, amphoteric polycarboxylate water reducer and preparation method thereof
  • A kind of amide functional monomer and preparation method thereof, amphoteric polycarboxylate water reducer and preparation method thereof
  • A kind of amide functional monomer and preparation method thereof, amphoteric polycarboxylate water reducer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Preparation of amide-containing functional monomers: 14.8g (0.20mol) N-methylurea, 11.6g (0.10mol) fumaric acid, 41.3g (0.20mol) dicyclohexylcarbodiimide and 1.2g (0.01mol) ) 4-dimethylaminopyridine was dissolved in dry dichloromethane and reacted at room temperature for 3 to 5 hours; the reaction was stopped, suction filtration was performed to remove insolubles, the obtained filtrate was rotary evaporated to remove the organic solvent, and the obtained product was treated with anhydrous Diethyl ether was washed to obtain an amide-containing functional monomer.

[0037] Amphoteric polycarboxylate water reducer:

[0038] Add 162g of isopentenyl polyoxyethylene ether (molecular weight 2400), 108g of deionized water and 1.58g of hydrogen peroxide whose mass fraction is 30% into the four-necked bottle; 17.00g of acrylic acid, 3.5g of amide-containing functional monomers Dissolve in 25g of deionized water to make Drop A, dissolve 0.50g of ascorbic acid in 25g of deionized ...

Embodiment 2

[0040] Preparation of amide-containing functional monomer: 18.5g (0.25mol) N-methylurea, 11.6g (0.10mol) fumaric acid, 51.6g (0.25mol) dicyclohexylcarbodiimide and 1.8g (0.015mol) ) 4-dimethylaminopyridine was dissolved in dry dichloromethane and reacted at room temperature for 3 to 5 hours; the reaction was stopped, suction filtration was performed to remove insolubles, the obtained filtrate was rotary evaporated to remove the organic solvent, and the obtained product was treated with anhydrous Diethyl ether was washed to obtain an amide-containing functional monomer.

[0041] Amphoteric polycarboxylate water reducer:

[0042] Add 162g of isopentenyl polyoxyethylene ether (molecular weight 2400), 108g of deionized water and 1.58g of hydrogen peroxide whose mass fraction is 30% into the four-necked bottle; 17.00g of acrylic acid, 3.85g of amide-containing functional monomers Dissolve in 25g of deionized water to make Drop A, dissolve 0.50g of ascorbic acid in 25g of deionized...

Embodiment 3

[0044]Preparation of amide-containing functional monomer: 14.8g (0.20mol) methyl carbamate, 11.6g (0.10mol) fumaric acid, 41.3g (0.20mol) dicyclohexylcarbodiimide and 1.2g (0.01mol) 4-Dimethylaminopyridine was dissolved in dry dichloromethane and reacted at room temperature for 3 to 5 hours; the reaction was stopped, suction filtration was performed to remove insoluble matter, the filtrate obtained was rotary evaporated to remove the organic solvent, and the obtained product was treated with anhydrous ether. After washing, an amide-containing functional monomer is obtained.

[0045] Add 162g of isopentenyl polyoxyethylene ether (molecular weight 2400), 108g of deionized water and 1.58g of hydrogen peroxide whose mass fraction is 30% into the four-necked bottle; 17.00g of acrylic acid, 4.2g of amide-containing functional monomers Dissolve in 25g of deionized water to make Drop A, dissolve 0.50g of ascorbic acid in 25g of deionized water to make Drop B, dissolve 0.79g of thiogly...

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Abstract

The invention relates to the technical field of concrete water reducers, in particular to an amide functional monomer and a preparation method thereof, and an amphoteric polycarboxylate water reducer and a preparation method thereof. The preparation method of the amide functional monomer comprises the following steps: according to the Steglich esterification reaction, the carbamate or N-alkylurea is mixed with the unsaturated carboxylic acid, and under the action of a dehydrating agent and a catalyst, in an anhydrous organic solvent The reaction is carried out at room temperature for 3-5 hours; suction filtration, rotary evaporation of the filtrate, removal of the organic solvent, and obtaining the amide functional monomer. The water reducer prepared by the amide functional monomer can improve the adsorption performance of the polycarboxylate water reducer on the surface of the cement particles, improve the adaptability of the polycarboxylate water reducer to the cement, and improve the dispersion of the cement. In addition, the molecular main chain of the amphoteric polycarboxylate superplasticizer does not contain chloride ions, and at the same time, it improves the anti-carbonation performance of concrete, solves the problem of concrete corrosion, and has important practical application value.

Description

technical field [0001] The invention relates to the technical field of concrete water reducers, in particular to an amide functional monomer and a preparation method thereof, and an amphoteric polycarboxylate water reducer and a preparation method thereof. Background technique [0002] Polycarboxylic acid series high-performance water reducer is a kind of copolymer with comb-like molecular structure. It has obvious advantages such as strong structural adjustability, and is widely used in concrete projects such as highways, bridges, and tunnels. For the polycarboxylate superplasticizers currently on the market, most of them are anionic polycarboxylate superplasticizers, and the market share of amphoteric polycarboxylate superplasticizers is low. [0003] Amphoteric polycarboxylate water reducing agent refers to the polymer main chain with multiple anionic and cationic groups (quaternary ammonium salts) or non-ionic groups (amide compounds) at the same time, and is classified...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C271/64C07C269/06C07C275/50C07C273/18C08F283/06C08F220/06C08F222/38
CPCC08F283/065C07C271/64C07C275/50C08F220/06C08F222/38
Inventor 林芹郭元强方云辉林艳梅柯余良
Owner KZJ NEW MATERIALS GROUP CO LTD