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Preparation method of powder melamine high-efficiency water reducing agent

A high-efficiency water-reducing agent and melamine technology, applied in the field of preparation of powdered melamine high-efficiency water-reducing agent, can solve problems such as water solubility and stability reduction, loss of performance such as water reducing rate, immature production technology, etc., and achieve air-entraining properties. The effect of low, reduced packaging and transportation costs, and short production cycle

Inactive Publication Date: 2014-04-02
LANZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Melamine-based water-reducing agent is an anionic water-reducing agent with good water solubility; when it is made into solid by traditional concentration and drying methods, it will lose various properties such as water-reducing rate, so it is still produced and applied in liquid form; and production The immature technology makes the product quality very unstable, which directly affects the use effect
When the liquid water reducer is concentrated and dried to prepare the solid water reducer, the activity of the methylol group in the sulfonated melamine formaldehyde resin becomes larger, the molecules are further polycondensed, and the excessive polymerization leads to a decrease in its water solubility and stability, and the water reducing rate and other properties lost

Method used

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  • Preparation method of powder melamine high-efficiency water reducing agent

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] In a three-neck flask equipped with mechanical stirring and a thermometer, add 7.77g of melamine, then add 15.00g of 37% formaldehyde solution, add 30% sodium hydroxide dropwise under stirring to adjust the pH of the solution to 9, control the temperature at 55°C, and react for 60 minutes ; Add 7.15g of sulfamic acid under continuous stirring, then adjust the pH of the solution to 10 with 30% sodium hydroxide, raise the temperature to 80°C, and perform sulfonation for 60 minutes; lower the temperature to 50°C, and adjust the pH of the solution with 30% sulfuric acid =5, react for 40 minutes; filter while hot to obtain liquid melamine superplasticizer.

[0026] Weigh 17.35 g of the liquid melamine superplasticizer prepared above, add 0.10 g of cellobiose, stir to dissolve it completely, concentrate, dry into a solid state, and then pulverize to obtain a powder melamine superplasticizer .

[0027] According to GB8076-2008, the concrete water-reducing rate and compressive...

Embodiment 2

[0029] In a three-necked flask equipped with mechanical stirring and a thermometer, add 7.77g of melamine, then add 16.00g of 37% formaldehyde solution, add 30% sodium hydroxide dropwise under stirring to adjust the pH of the solution to 10, control the temperature at 57°C, and react for 80 minutes ; Add 7.20g of sulfamic acid under continuous stirring, then use 30% sodium hydroxide to adjust the pH of the solution to 11, raise the temperature to 83°C, and perform the sulfonation reaction for 70 minutes; lower the temperature to 53°C, and use 30% sulfuric acid to adjust the pH of the solution =5.5, reacted for 50 minutes; filtered while hot to obtain liquid melamine superplasticizer.

[0030] Weigh 34.7 g of the liquid melamine superplasticizer prepared above, add 0.20 g of cellobiose, stir to dissolve it completely, concentrate, dry into a solid state, and then pulverize to obtain a powder melamine superplasticizer .

[0031] According to GB8076-2008, the concrete water-redu...

Embodiment 3

[0033] In a three-necked flask equipped with mechanical stirring and a thermometer, add 7.77g of melamine, then add 17.50g of 37% formaldehyde solution, add 30% sodium hydroxide dropwise under stirring to adjust the pH of the solution to 12, control the temperature at 60°C, and react for 90 minutes ; Add 7.23g of sulfamic acid under continuous stirring, then use 30% sodium hydroxide to adjust the pH of the solution to 12, raise the temperature to 85°C, and perform the sulfonation reaction for 80 minutes; lower the temperature to 55°C, and use 30% sulfuric acid to adjust the pH of the solution =6, react for 60 minutes; filter while hot to obtain liquid melamine superplasticizer.

[0034] Weigh 23.1 g of melamine superplasticizer, add 0.13 g of sorbitol, stir to dissolve it completely, then concentrate and dry to obtain powdered melamine superplasticizer.

[0035] According to GB8076-2008, the concrete water-reducing rate and compressive strength were tested when the amount of t...

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Abstract

The invention provides a preparation method of a powder melamine high-efficiency water reducing agent. The preparation method comprises the following steps of: performing hydroxymethylation reaction, sulfonation reaction and condensation reaction on melamine, formaldehyde, sulfamic acid, cellobiose, sodium hydroxide and sulfuric acid serving as raw materials to obtain a liquid-state melamine high-efficiency water reducing agent; adding the cellobiose in to the prepared liquid-state water reducing agent as a stabilizer; and concentrating and drying to obtain the powder melamine high-efficiency water reducing agent. According to the preparation method, the melamine series high-efficiency water reducing agent is successfully prepared; particularly, the melamine liquid-state water reducing agent is converted into a solid water reducing agent on the premise of not reducing the performance of the water reducing agent; and thus, the high-performance water reducing agent which has the characteristics of good water reducing effect, environmental friendliness, long storage period, convenience in transportation and the like is achieved.

Description

technical field [0001] The invention relates to the preparation technology of melamine high-efficiency water reducer, in particular to a preparation method of powder melamine high-efficiency water reducer. Background technique [0002] With the emergence of high-strength concrete (HRC) and high-performance concrete (HPC), high-efficiency water-reducers are required, but the high-efficiency water-reducers commonly used in my country can no longer meet their requirements. In this case, melamine water reducer has attracted people's attention because of its excellent performance. Compared with other water reducers, it has the characteristics of superplasticization, small air entrainment, high reinforcement, and high water reducing rate. It is a high-strength concrete, Ideal admixture for high performance concrete. Melamine-based water-reducing agent is an anionic water-reducing agent with good water solubility; when it is made into solid by traditional concentration and drying ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/16C04B103/30
Inventor 刘建军张森石辉文
Owner LANZHOU UNIVERSITY
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