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Modified melamine high-efficiency water reducing agent with low cost

A high-efficiency water-reducing agent and melamine technology, applied in the field of building material admixtures and chemical synthesis, can solve the problems affecting mass production and popularization, high inventory and transportation costs, strict reaction requirements, etc., to shorten the steam curing time. , the effect of low cost and short setting time

Active Publication Date: 2013-03-20
安徽海螺材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of water reducer has disadvantages such as high production cost, difficulty in making powder, high inventory and transportation costs, harsh reaction requirements, and difficult quality control.
These have greatly affected its mass production and promotion and application.
The modified melamine high-efficiency water-reducer disclosed in the patent application number 200310115062.9 is to modify the previous melamine high-efficiency water-reducer to delay the setting time of concrete and solve the problem of large slump loss of concrete during transportation and construction. Its cost is higher

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1 (proportioning is molar ratio)

[0035] Add 0.4 parts of melamine, 0.2 parts of urea and 1.5 parts of formaldehyde (37% aqueous solution) into a four-necked flask, stir evenly, adjust pH=8, heat up to 70°C, and react for 50 minutes; put in 0.4 parts of sodium bisulfite, 0.2 One part sodium metabisulfite and one part deionized water, adjust pH=10, heat up to 80°C, react for 100 minutes; cool down to 50°C, adjust pH=4.5, react for 100 minutes; heat up to 85°C, adjust pH=8.5, react for 60 minutes . Down to normal temperature, the melamine superplasticizer of the present invention is obtained.

Embodiment 2

[0036] Embodiment 2 (proportioning is molar ratio)

[0037] Add 0.3 parts (moles) of melamine, 0.3 parts of urea and 1.8 parts of formaldehyde (37% aqueous solution) into a four-neck flask, stir evenly, adjust the pH to 8.5, heat up to 70°C, and react for 50 minutes; add 0.4 parts of sulfurous acid Sodium hydrogen, 0.3 parts of sodium metabisulfite and a part of deionized water, adjust pH=10, heat up to 80°C, and react for 100 minutes; cool down to 50°C, adjust pH=4.5, and react for 100 minutes; heat up to 85°C, adjust pH= 8.5, react for 60 minutes. Down to normal temperature, the melamine superplasticizer of the present invention is obtained.

Embodiment 3

[0038] Embodiment 3 (proportioning is molar ratio)

[0039] Add 0.3 parts of melamine, 0.4 parts of urea and 2.0 parts of formaldehyde (37% aqueous solution) into a four-necked flask, stir evenly, adjust pH=8.5, heat up to 80°C, and react for 60 minutes; put in 0.4 parts of sodium bisulfite, 0.3 One part sodium metabisulfite and one part deionized water, adjust pH=10, heat up to 85°C, react for 100 minutes; cool down to 50°C, adjust pH=4.5, react for 100 minutes; heat up to 85°C, adjust pH=8.5, react for 60 minutes . Down to normal temperature, the melamine superplasticizer of the present invention is obtained.

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PUM

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Abstract

The invention belongs to the field of building materials and chemical synthetic techniques, in particular to a modified melamine high-efficiency water reducing agent with low cost and a preparation method thereof. Urea, melamine, formaldehyde, sodium hydrosulfite and sodium pyrosulfite are used as raw materials, sodium hydroxide and sulfuric acid are used as pH regulators, and at the condition that the temperature is 50-95 DEG C, hydroxymethylation, sulfonation, condensation reaction, alkaline reforming and the like are carried out for 4-8 hours to generate the faint yellow and transparent melamine high-efficiency water reducing agent. The product has low product cost and high water reducing yield, and has remarkable application effect in steamed concrete.

Description

Technical field: [0001] The invention belongs to the technical field of building material additives and chemical synthesis, and in particular relates to a low-cost modified melamine high-efficiency water reducer and a preparation method thereof. Background technique: [0002] The production and application of modern concrete are inseparable from concrete admixtures, which have become the fifth component of concrete besides cement, water, sand and stone. The water reducer is the most widely used and the most widely used admixture, and its amount accounts for more than 80% of the total amount of admixture. High-efficiency water-reducing agent is a water-reducing agent with high water-reducing rate, neither retarding nor air-entraining. Due to the emergence of high-efficiency water reducers, high-strength and high-fluidity concrete can be realized, which ensures the development of new concrete construction techniques. Currently commonly used high-efficiency water reducers inc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G12/40C08G12/38C04B24/30C04B103/30
Inventor 冯恩娟傅秀新赵洪义朱化雨
Owner 安徽海螺材料科技股份有限公司
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