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Preparation method for sulfamate formaldehyde condensate

A technology of formaldehyde condensate and sulfamate, which is applied in the field of concrete water reducer, can solve the problems of concrete bleeding and hardening, and achieve the effects of preventing bleeding and hardening, prolonging the action time, and changing the dispersion performance

Active Publication Date: 2015-11-18
云南森博混凝土外加剂有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the mechanism of the water reducing agent leads to the phenomenon of concrete bleeding and hardening is more common

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A kind of preparation method of sulfamic acid salt formaldehyde condensate comprises the weight parts of following components:

[0037] Sodium p-aminobenzenesulfonate: 1000 parts,

[0038] Phenol: 800 parts,

[0039] Acetone: 20 parts,

[0040] Lye: 330 parts,

[0041] Urea: 45 parts,

[0042] Acrylamide: 8 parts,

[0043] Water: 4500 parts.

[0044] Its preparation method steps are:

[0045] (1) Weighing parts of water and pouring it into the reaction kettle, while raising the temperature to 50-55°C;

[0046] (2) Weighing parts by weight of sodium p-aminobenzenesulfonate, phenol, acetone, and 150 parts of liquid caustic soda with a concentration of 30% are added to the reaction kettle, and stirred evenly to obtain a mixture;

[0047] (3) Add formaldehyde in parts by weight into the reaction kettle in 6 times every 10 minutes; control the temperature at 80-90°C, and react for 3 hours;

[0048] (4) Add parts by weight of urea, acrylamide, 180 parts of liquid caus...

Embodiment 2

[0050] Sodium p-aminobenzenesulfonate: 1100 parts,

[0051] Phenol: 750 parts,

[0052] Acetone: 20 parts,

[0053] Alkali: 360 parts,

[0054] Urea: 48 parts,

[0055] Acrylamide: 10 parts,

[0056] Water: 4400 parts.

[0057] Its preparation method steps are:

[0058] (1) Weighing parts of water and pouring it into the reaction kettle, while raising the temperature to 50-55°C;

[0059] (2) Weighing parts by weight of sodium sulfanilate, phenol, acetone, and adding 160 parts of liquid caustic soda with a concentration of 30% into the reaction kettle, and stirring evenly to obtain the mixture;

[0060] (3) Add formaldehyde in parts by weight into the reaction kettle in 6 times every 10 minutes; control the temperature at 80-90°C, and react for 3 hours;

[0061] (4) Add parts by weight of urea, acrylamide, 200 parts of liquid caustic soda with a concentration of 30%, keep the temperature at 90-95°C, and react for 2h; after the temperature is controlled at 85-90°C for 1.5...

Embodiment 3

[0063] Sodium p-aminobenzenesulfonate: 1200 parts,

[0064] Phenol: 800 parts,

[0065] Acetone: 20 parts,

[0066] Alkali: 380 parts,

[0067] Urea: 50 parts,

[0068] Acrylamide: 10 parts,

[0069] Water: 4500 parts.

[0070] Its preparation method steps are:

[0071] (1) Weighing parts of water and pouring it into the reaction kettle, while raising the temperature to 50-55°C;

[0072] (2) Weighing parts by weight of sodium sulfanilate, phenol, acetone, and adding 180 parts of liquid caustic soda with a concentration of 30% into the reaction kettle, and stirring evenly to obtain the mixture;

[0073] (3) Add formaldehyde in parts by weight into the reaction kettle in 6 times every 10 minutes; control the temperature at 80-90°C, and react for 3 hours;

[0074] (4) Add parts by weight of urea, acrylamide, 200 parts of liquid caustic soda with a concentration of 30%, keep the temperature at 90-95°C, and react for 2h; after the temperature is controlled at 85-90°C for 1.5...

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Abstract

The present invention discloses a preparation method for a sulfamate formaldehyde condensate and belongs to the field of concrete water reducing agents. The preparation method for the sulfamate formaldehyde condensate comprises: adding raw material water, sodium p-aminobenzesulfonate, phenol, acetone and alkali liquor; carrying out a reaction at a certain temperature,; and then adding urea and acrylamide. According to the preparation method provided by the present invention, by controlling an adding sequence of the raw materials, the reacting time and the temperature, molecular chains of urea, formaldehyde and a mixture are recombined and the molecular weight is changed, and meanwhile acrylamide is grafted as a branched chain, an amide effective factor is introduced, the molecular structure of the amino is changed, the dispersion property of the water reducing agent is changed, and a phenomenon of bleeding and hardening of concrete is improved, so that the concrete has a better performance and meanwhile the effective time is prolonged, and the slump retaining aspect is further improved.

Description

technical field [0001] The invention relates to the field of concrete water reducers, in particular to a preparation method of sulfamate formaldehyde condensate. Background technique [0002] Amino sulfamate formaldehyde condensate (abbreviated as amino) is widely used in concrete superplasticizers. Amino is favored for its high water reducing rate and high strength. However, due to its own molecular structure and water-reducing mechanism, mixed concrete is prone to bleeding and hardening. [0003] At present, the production process of amino water reducer is that sodium p-aminobenzenesulfonate is contacted with phenol under a certain temperature environment, and undergoes formaldehyde condensation reaction, thereby forming a main chain formed by formaldehyde condensation, with water reducing factors such as sulfo, carboxyl, and hydroxyl groups. High-efficiency water-reducing admixture for side chains. However, the mechanism of the water reducing agent leads to the phenomen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/16C04B103/30
Inventor 阿光强郭海
Owner 云南森博混凝土外加剂有限公司
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