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Preparation method of functional polycarboxylate-type water reducing agent for resisting flocculating agent in machine-made sand

A technology of polycarboxylic acid series and water reducing agent is applied in the field of functional polycarboxylic acid series water reducing agent.

Active Publication Date: 2021-04-16
江苏亚琛材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the long side chains of the comb structure are also easily absorbed by the intercalation of the pores of the machine-made sand, and the quaternary ammonium salt cations cannot resist the influence of the complex and changeable flocculant system on the cement hydration

Method used

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  • Preparation method of functional polycarboxylate-type water reducing agent for resisting flocculating agent in machine-made sand
  • Preparation method of functional polycarboxylate-type water reducing agent for resisting flocculating agent in machine-made sand

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Effect test

Embodiment 1

[0023] Dissolve 100g of N-chloromethylphthalimide in 420g of ethylene glycol ether, then add 3g of trimethylhydroxyethylethylenediamine and stir for 6 hours at 20°C to obtain o-phenylketene imine;

[0024] Then 8g o-phenylketeneimine and 3g carbonamide were mixed evenly and then added dropwise to 100g of polyethylene glycol monomethyl ether with bis-azido group in the molten state at 45°C in a molten state with a weight average molecular weight of 2000 and In 0.1g of trifluoroperacetic acid, carry out in-situ polymerization reaction, add dropwise for 2h, obtain in-situ polycarboxylate water reducer;

[0025] Finally, 100g of in-situ polycarboxylate water-reducer and 100g of chloroform were subjected to Delepine reaction at 60°C for 1 hour in a nitrogen gas of 0.2Mpa atmospheric pressure to obtain a functional polycarboxylate water-reducer.

Embodiment 2

[0027] Dissolve 100g of N-methylolphthalimide in 310g of propylene glycol ether, then add 5g of dimethylaminodiethyl ether and stir at 40°C for 3 hours to obtain o-phenylketeneimine;

[0028] Then mix 8.5g of o-phenylketeneimine and 4g of diethyl hydroxymalonate evenly, and then dropwise add 100g of end group-containing bis-azido polyethylene glycol with a weight-average molecular weight of 1000 in a molten state at 60°C to the reactor. Carry out in-situ polymerization reaction in glycol monomethyl ether and 0.13g peroxybenzoic acid, add dropwise for 2h, obtain in-situ polycarboxylate water reducer;

[0029] Finally, 100g of in-situ polycarboxylate-based water reducer and 108g of 1,2-dichloroethane were subjected to Delepine reaction at 70°C for 3h in nitrogen gas at 0.4Mpa atmospheric pressure to obtain a functional polycarboxylate-based water-reducer .

Embodiment 3

[0031] Dissolve 100g of N-chloromethylphthalimide in 380g of propylene glycol ethyl ether, then add 6g of dimethylaminodiethyl ether and stir for 4 hours at 35°C to obtain o-phenylketeneimine;

[0032] Then mix 10g of o-phenylketeneimine and 5.5g of diethyl aminomalonate evenly, and then dropwise add 100g of polyethylene glycol with a weight average molecular weight of 1200 in a molten state at 50°C to the reactor. Alcohol monomethyl ether and 0.15g trifluoroperacetic acid, carry out in-situ polymerization reaction, add dropwise for 3h, obtain in-situ polycarboxylate water reducer;

[0033] Finally, 100g of in-situ polycarboxylate water-reducer and 135g of methyl iodide were subjected to Delepine reaction at 65°C for 2h in nitrogen gas at an atmospheric pressure of 0.3Mpa to obtain a functional polycarboxylate water-reducer.

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Abstract

The invention relates to a preparation method of a functional polycarboxylate-type water reducing agent for resisting a flocculating agent in machine-made sand. The preparation method comprises the following specific steps: firstly, modifying imide under the action of an amine catalyst to obtain o-phenyl ketene imide; then enabling ketene imine, an unsaturated carboxylic acid derivative and an oxidizing agent to be subjected to an in-situ polymerization reaction in molten polyethylene glycol monomethyl ether, adding alkyl halide after the reaction is completed, performing a Delepine reaction, and obtaining the functional polycarboxylic acid water reducing agent. The functional polycarboxylate-type water reducing agent for resisting the flocculating agent in the machine-made sand prepared by the method disclosed by the invention can eliminate the influence of the flocculating agent in the machine-made sand on the dispersion performance of concrete, and ensures the working performance, the mechanical property and the durability of the concrete.

Description

technical field [0001] The invention relates to the technical field of a functional polycarboxylate water reducer, in particular to a preparation method of a functional polycarboxylate water reducer that resists flocculants in machine-made sand. Background technique [0002] With the rapid expansion and vigorous development of the national infrastructure industry, the supply and demand of sand and gravel, the raw material for concrete, is becoming increasingly tense. In order to meet the demand for sand and gravel, all kinds of mountain sand and machine sand with high mud and powder content have to be used. Therefore, , The quality of sand and gravel varies, and the performance gap is large. Under the strict supervision of the environmental protection department, it is clearly required that the waste water of sand and gravel production enterprises shall not be discharged outside. Therefore, in order to improve the quality of sand and gravel, a large number of sand and gravel...

Claims

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Application Information

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IPC IPC(8): C08F283/06C04B24/26C04B103/30
Inventor 马彬彬张健李锦鑫
Owner 江苏亚琛材料科技有限公司
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