Concrete water reducer and preparation method thereof

A technology of concrete water reducing agent and vinylcarbazole, which is applied in the field of concrete water reducing agent and its preparation, can solve the problems of increasing concrete slump, low dosage of water reducing agent, increasing cost, etc., and achieves changing grain boundary. Energy, low dosage, and the effect of improving strength

Inactive Publication Date: 2020-07-03
苏州朗达材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The water reducing agent of the invention has low dosage, high water reducing rate and good plasticizing effect, which can significantly increase the slump of concrete, improve the cohesion and workability of concrete, but its many components increase the cost, and in addition Due to the problem of cohesion between them, it has a negative impact on the setting time and early and late strength of concrete

Method used

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Examples

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Comparison scheme
Effect test

preparation example Construction

[0025] Preferably, the preparation of the carboxyl-modified N-vinylcarbazole / polyethylene glycol monoallyl ether / 5-vinyl-1,2,4-oxadiazole-3-carboxylic acid ethyl ester copolymer method, comprising the steps of:

[0026] Step S1, adding N-vinyl carbazole, polyethylene glycol monoallyl ether, 5-vinyl-1,2,4-oxadiazole-3-carboxylic acid ethyl ester and initiator to the high boiling point solvent In a nitrogen or inert gas atmosphere, the reaction was stirred at 65-75°C for 4-6 hours, and the solvent was removed by rotary evaporation to obtain N-vinylcarbazole / polyethylene glycol monoallyl ether / 5-vinyl- 1,2,4-oxadiazole-3-carboxylate ethyl ester copolymer;

[0027] Step S2, the N-vinylcarbazole / polyethylene glycol monoallyl ether / 5-vinyl-1,2,4-oxadiazole-3-carboxylic acid ethyl ester copolymer prepared through step S1 Add N-methylpyrrolidone, then add chloromalonic acid and basic catalyst, stir and react at 70-80°C for 4-6 hours, and then remove N-methylpyrrolidone by rotary eva...

Embodiment 1

[0035] Embodiment 1 provides a concrete water reducer, which is characterized in that it is made of the following raw materials in parts by weight: carboxyl-modified N-vinyl carbazole / polyethylene glycol monoallyl ether / 5-vinyl - 10 parts of ethyl 1,2,4-oxadiazole-3-carboxylate copolymer, 5 parts of 3-aminopyrazine-2-carboxylic acid modified epoxy-terminated hyperbranched poly(amine-ester), rare earth 2 parts of metal organic framework, 3 parts of N-sulfochitosan, 30 parts of water.

[0036] The preparation method of the carboxy-modified N-vinyl carbazole / polyethylene glycol monoallyl ether / 5-vinyl-1,2,4-oxadiazole-3-ethyl carboxylate copolymer comprises Follow the steps below:

[0037] Step S1, adding N-vinyl carbazole, polyethylene glycol monoallyl ether, 5-vinyl-1,2,4-oxadiazole-3-carboxylic acid ethyl ester and initiator to the high boiling point solvent In a nitrogen or inert gas atmosphere, the reaction was stirred at 65°C for 4 hours, and then the solvent was removed ...

Embodiment 2

[0045] Embodiment 2 provides a concrete water reducing agent, its formulation and preparation method are basically the same as in Embodiment 1, the difference is that it is made of the following raw materials in parts by weight: carboxyl-modified N-vinylcarbazole / polyethylene Glycol monoallyl ether / 5-vinyl-1,2,4-oxadiazole-3-carboxylic acid ethyl ester copolymer 13 parts, 3-aminopyrazine-2-carboxylic acid modified epoxy end group 6 parts of hyperbranched poly(amine-ester), 2.5 parts of rare earth metal organic framework, 4 parts of N-sulfochitosan, and 32 parts of water.

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Abstract

The invention relates to a concrete water reducing agent. The concrete water reducing agent is characterized by being prepared from the following raw materials in parts by weight: 10 to 20 parts of acarboxyl modified N-vinyl carbazole/polyethylene glycol mono-allyl ether/5-vinyl-1,2,4-oxadiazole-3-carboxylic acid ethyl ester copolymer, 5 to 10 parts of 3-aminopyrazine-2-carboxylic acid modified epoxy terminated hyperbranched poly(amine-ester), 2 to 4 parts of rare earth metal organic framework, 3 to 6 parts of N-sulfo chitosan and 30 to 40 parts of water. The invention also provides a preparation method of the concrete water reducing agent. The concrete water reducing agent is low in mixing amount, strong in water reducing performance and good in plasticizing effect, has no negative influence on the comprehensive performance of concrete, can obviously improve the flowability and the working performance of cement concrete of machine-made sand, improves the strength, the durability andthe thawing-freezing resistance of concrete, and is good in adaptability to the concrete.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a concrete water reducer and a preparation method thereof. Background technique [0002] In recent years, with the development of the economy and the progress of the society, people's living standards have been improved year by year, and the demand for improving the living environment has become more and more urgent. It is in this situation that various major construction projects have been proposed one after another. These major construction projects are a symbol of urban modernization and a symbol of modern civilization. The use of concrete materials is inseparable from the back of these major construction projects. Concrete materials are referred to as "concrete", which usually refers to the use of cement as cementing material, sand and stone as aggregates, mixed with water in a certain proportion, and mixed with water. The resulting important building material. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/32C08F283/06C08F226/12C08F226/06C04B103/30
CPCC04B24/32C04B2103/302C08F283/065C08F226/12C08F226/06
Inventor 赵建庆
Owner 苏州朗达材料科技有限公司
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