Carboxyl acid modified melamine high-efficiency water-reducing agent

A high-efficiency water-reducing agent and melamine technology, which is applied in the field of concrete admixtures, can solve the problems of difficulty in guaranteeing engineering quality, water-reducing and water-retaining effects are not obvious, and engineering construction impacts, etc. strong effect

Inactive Publication Date: 2009-03-18
长春建工集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As far as the country is concerned, in order to meet different construction requirements, the admixture industry still generally adopts the method of compounding, and there are still few single high-efficiency water reducers with high performance and multiple functions.
At present, the types of domestic superplasticizers mainly include: polycarboxylate superplasticizers, sulfamate superplasticizers, and naphthalenesulfonate superplasticizers. There are also problems of varying degrees: although the polycarboxylate high-efficiency water-reducing agent has a high water-reducing rate, it is sensitive in response and difficult to control during constructio

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Melamine: sulfamic acid: sodium bisulfite: salicylic acid: citric acid: phenol: self-made modified sulfonating agent: formaldehyde: liquid alkali: water = 1:2.5:0.6:0.4:0.2:0.2:0.5:6 : 1.5: 14.4 (each component is by weight ratio). Raise the temperature from 65°C to 85°C, and go through four stages of hydroxymethylation reaction, sulfonation reaction, condensation reaction, and stable rearrangement reaction. After 4 hours of reaction, a slightly yellow, transparent, and low-viscosity linear polymer is formed. Water-soluble liquid, namely obtains the present invention of 30% concentration.

Embodiment 2

[0014] Melamine: sulfamic acid: sodium bisulfite: salicylic acid: citric acid: phenol: self-made modified sulfonating agent: formaldehyde: liquid alkali: water = 1:3:0.8:0.5:0.2:0.3:0.6:7 : 2: 9 (each component is by weight ratio). There are four stages of sulfonation reaction, condensation reaction and stable rearrangement reaction. After 4 hours of reaction, a slightly yellow, transparent and low-viscosity linear high-molecular water-soluble liquid is obtained, that is, a 40% concentration of the present invention is obtained.

[0015] In the above examples, the content of melamine ≥ 99.8%, the content of sodium bisulfite industrial grade ≥ 99%, the content of salicylic acid ≥ 99%, the content of citric acid industrial grade ≥ 90%, the content of phenol as a superior product ≥ 99.8%, and the formaldehyde solution The concentration is 37%, and the concentration of liquid caustic soda solution is 30%.

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PUM

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Abstract

The invention discloses a novel melamine super plasticizer modified by carboxylic acid. The melamine super plasticizer is made by reacting a primary material of melamine with amino sulfonic acid, sodium bisulfite, salicylic acid, citric acid, phenol, self-made sulphonating agent, formaldehyde and caustic soda liquid at a certain temperature and a certain pH value. The novel melamine super plasticizer modified by carboxylic acid has the characteristics of high water reducing rate, good adaptability and good water retentivity and has better effect when used in large concrete member having relatively high requirement on surface finish quality and high-strength concrete and self-compacting concrete.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a novel carboxylic acid modified melamine high-efficiency water reducer. Background technique [0002] With the development of society, urban construction and the enhancement of people's awareness of environmental protection, the environmental pollution and noise pollution generated in the construction of concrete mixing on site have seriously affected people's daily life. Commercial concrete has been widely used. Due to the different characteristics of each project, the requirements for admixtures are also different. With the extensive use of high-strength concrete and self-leveling concrete, ordinary water reducers can no longer adapt to the development of the concrete industry. At the same time, higher requirements have been put forward for the concrete admixture industry. requirements. [0003] With the development of the concrete admixture industry, the researc...

Claims

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Application Information

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IPC IPC(8): C04B24/24C04B103/30
CPCC04B2111/62C04B2103/302C04B24/223C04B2111/00336
Inventor 刘红董艳辉陶忠谦
Owner 长春建工集团有限公司
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