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Method for preparing novel sulfamic acid high-efficiency concrete water reducing agent

A technology of concrete water reducing agent and sulfamic acid, which is applied in the field of preparation of new concrete water reducing agent, can solve the problems of high cost, poor concrete plastic retention, and poor plastic retention

Inactive Publication Date: 2010-06-09
JIANG SU TMS CONCRETE ADDITION AGENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, formaldehyde polymers of p-aminobenzenesulfonic acid and phenol, and sulfonated melamine formaldehyde polymers, have been promoted and widely used as high-efficiency concrete water reducers. Melamine-formaldehyde polymers have poor plastic retention properties for concrete. The invention is a novel high-efficiency concrete water-reducer prepared with aminobenzenesulfonic acid, which reduces the cost of preparing concrete high-efficiency water-reducers with aminobenzenesulfonic acid, and makes up for sulfonated melamine The weak point of formaldehyde polymer to the poor plasticity of concrete

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Add 270KG of water to the bottom of the reaction kettle, add 130KG of melamine, stir and add 260KG of 30% formaldehyde solution, adjust the pH value to 11-11.5 with alkaline solution, heat up to 75°C, and keep warm for 1.5 hours. Add 245KG of sodium p-aminobenzenesulfonate and continue to incubate for 1 hour. Add p-aminobenzenesulfonic acid, adjust the pH value to 3.5, react at 70°C for 6 hours, add sodium hydroxide solution, adjust the pH value to 7-8, and obtain a new type of sulfamic acid high-efficiency concrete water reducer.

[0013] Perform performance test on the obtained high-efficiency cement superplasticizer:

[0014] (1) Fluidity test of cement paste

[0015] The fluidity of cement paste is tested with reference to the "Concrete Admixture Homogeneity Test Method" (GB8077-2000) standard.

[0016] According to the cement obtained by adding 0.4% of the dry product of this product, the fluidity of the cement slurry is measured to be 255MM.

[0017] (2) Concre...

Embodiment 2

[0022] Add 95KG of water to the bottom of the reaction kettle, add 83KG of melamine, stir and add 220KG of 40% formaldehyde solution, adjust the pH value to 11-11.5 with alkaline solution, heat up to 75°C, and keep warm for 1.5 hours. Add 323KG of sodium p-aminobenzenesulfonate, and continue to incubate for 1 hour. Add p-aminobenzenesulfonic acid, adjust the pH value to 4.5, react at 82°C for 1 hour, add potassium hydroxide solution, adjust the pH value to 7-8, and obtain a new type of sulfamic acid high-efficiency concrete water reducer.

[0023] Perform performance test on the obtained high-efficiency cement superplasticizer:

[0024] (1) Fluidity test of cement paste

[0025] The fluidity of cement paste is tested with reference to the "Concrete Admixture Homogeneity Test Method" (GB8077-2000) standard.

[0026] According to the cement obtained by adding 0.4% of the dry product of this product, the fluidity of the cement slurry is measured to be 245MM.

[0027] (2) Concr...

Embodiment 3

[0032] Add 350KG of water to the bottom of the reaction kettle, add 68KG of melamine, stir and add 163KG of paraformaldehyde, adjust the pH value to 11-11.5 with liquid caustic soda, raise the temperature to 75°C, and keep it warm for 1.5 hours. Add 380KG of sodium p-aminobenzenesulfonate and continue to incubate for 1 hour. Add p-aminobenzenesulfonic acid, adjust the pH value to 4.3, react at 78°C for 5 hours, add calcium hydroxide solution, adjust the pH value to 7-8, and obtain a new type of sulfamic acid high-efficiency concrete water reducer.

[0033] Perform performance test on the obtained high-efficiency cement superplasticizer:

[0034] (1) Fluidity test of cement paste

[0035] The fluidity of cement paste is tested with reference to the "Concrete Admixture Homogeneity Test Method" (GB8077-2000) standard.

[0036] According to the cement obtained by adding 0.4% of the dry product of this product, the fluidity of the cement slurry is measured to be 255MM.

[0037] ...

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Abstract

The invention relates to a method for preparing novel sulfamic acid high-efficiency concrete water reducing agent, which is carried out according to the steps of: (1) hydroxymethylation: adding formaldehyde with the mass ratio of 3-6 with melamine into melamine solution, adjusting the pH value to be 10-12, and carrying out heat preservation for 1-5h at the temperature of 65-95 DEG C; wherein the formaldehyde is polyformaldehyde or 30-40% of formaldehyde water solution; (2) sulfonation: adding p-amino benzene sulfonic acid sodium with the mass ratio of 1-3 with melamine into the melamine solution treated by hydroxymethylation, maintaining the pH value to be 10-12, and keeping the temperature of 70-85 DEG C for 1-3h; (3) etherification reaction: adjusting the pH value to be 3.5-6, and reacting for 1-6h at the temperature of 70-95 DEG C; and (4) neutralization: adding alkali and adjusting the pH value to be 7-9. The high-efficiency concrete water reducing agent prepared by the method can be separately used when the solid doping quantity is 4%, has the water reducing rate of 24% and increases the later period strength of concrete to be 140%.

Description

technical field [0001] The invention relates to a preparation method of a novel concrete water reducer, in particular to a method for preparing a high-efficiency concrete water reducer by using p-aminobenzenesulfonic acid and melamine. Background technique [0002] At present, formaldehyde polymers of p-aminobenzenesulfonic acid and phenol, and sulfonated melamine formaldehyde polymers, have been promoted and widely used as high-efficiency concrete water reducers. Melamine-formaldehyde polymers have poor plastic retention properties for concrete. The invention is a novel high-efficiency concrete water-reducer prepared with aminobenzenesulfonic acid, which reduces the cost of preparing concrete high-efficiency water-reducers with aminobenzenesulfonic acid, and makes up for sulfonated melamine Oxymethylene polymers have poor plastic retention properties for concrete. Contents of the invention [0003] The purpose of this invention is to provide a kind of method for preparin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/20C04B103/30
Inventor 陈国忠陈炜徐大勇
Owner JIANG SU TMS CONCRETE ADDITION AGENT
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