Aminosulfonic acid series high-effective water-reducing agent and its preparation method

A high-efficiency water-reducing agent and sulfamic acid-based technology, applied in the field of high-efficiency water-reducing agents, can solve the problems of inability to meet high-performance concrete construction, large slump loss, and high cost of water-reducing agents, and achieve high water-reducing rate, Small slump loss and good dispersion effect

Inactive Publication Date: 2003-09-03
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this kind of water reducer is expensive in raw materials, the synthesis process conditions require strict control, and the slump loss is large. Therefore, it is only suitable for special projects.
[0005] Chinese patent 93102953.8 discloses the use of polycarboxylic acid superplasticizers such as alkenyl ether and maleic anhydride copolymers, which have high plasticizing effects at low dosages, good fluidity retention, wide cement adaptability, and water-reducing properties. High efficiency, but high cost, expensive, complex operation process
[0007] The high-efficiency water reducer currently used is mainly composed of aromatic sulfonate formaldehyde condensate or melamine sulfonate formaldehyde condensate. Although its water reducing rate is high, it often has high cost and large slump loss, especially The fluidity is poor at low water-cement ratio, which cannot meet the requirements of high-performance concrete construction; while the cost of polycarboxylate water reducers is high and the preparation process is complicated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0023] First take 800 grams of solid diaminobenzenesulfonic acid, add 70 grams of terephthalamide and 500 grams of hydroquinone, then add 2000 grams of water, 500 grams of lignosulfonate, and trigger catalyst FeCl 2 0.2 g and oxidizing agent H 2 o 2 20 grams, heated to 80°C while stirring, and reacted at this temperature for 6 hours; added sodium hydroxide to adjust the pH value at 8-9, stirred rapidly for 30 minutes, and obtained a liquid product of concrete superplasticizer after cooling, and then dried And made powder.

example 2

[0025] First take 200 grams of solid aminobenzenesulfonic acid, add 150 grams of formaldehyde and 800 grams of benzylphenol, then add 2000 grams of water, 100 grams of lignosulfonate, and trigger catalyst FeCl 2 0.01 g, FeSO 4 0.2 g and oxidizing agent H 2 o 2 50 grams, heated to 110°C while stirring, reacted at this temperature for 1 hour; added calcium hydroxide solution to adjust the pH value at 8-9, stirred rapidly for 30 minutes, and obtained the liquid product of concrete superplasticizer after cooling, and then passed Dry to obtain a powder.

example 3

[0027] First take 1100 grams of solid aminobenzenesulfonic acid, add 150 grams of formaldehyde and 800 grams of benzylphenol, then add 2000 grams of water, 800 grams of lignosulfonate, and trigger catalyst FeCl 2 0.2 g, Cu(NO 3 ) 2 0.1 g and oxidant KMnO 4 20 grams, heated to 90°C while stirring, and reacted at this temperature for 5 hours; added sodium metabisulfite solution to adjust the pH value to 8-9, stirred rapidly for 60 minutes, and obtained the liquid product of concrete superplasticizer after cooling, and then dried And made powder.

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PUM

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Abstract

The present invention designs an amino sulfonic acid series high-efficiency water reducing agent and its preparation method. Its preparation method includes the following steps: using (by weight portion) 20-110 portions of aminoarylsulfonic acid and / or aminoalkylarylsulfonic acid, adding 7-15 portions of condensation agent, 50-80 portions of arylphenol and / or arylalkyl phenol, adding 200 portions of water, 10-80 portions of lignin sulfonate, 0.001-0.03 portions of initiation catalyst and 0.3-5 portions of oxidant in reactor, heating to 60-110 deg.c to make initiation, catalysis and condensation reaction for 1-10 hr.; adding 10-50 portions of alkaline regulator, stirring for 10-60 min., cooling to room temp. so as to obtain the invented liquid product. Said product raises the adsorption quantity on the cement particles and anchoring strength, and can raise and retain dispersion capacity for a long period for cement particles, so that it not only can attain the goal of raising water reducing rate and improving collapse loss, but also can reduce production cost of water reducing agent.

Description

technical field [0001] The invention relates to a high-efficiency water reducer for concrete and mortar and a preparation method thereof. More specifically, the present invention utilizes aminoarylsulfonic acid (or aminoalkylarylsulfonic acid), aryl (or arylsulfonyl) phenol, p-phenylenedimethanol (or formaldehyde) and lignosulfonate as raw materials A high-efficiency water-reducing agent with high water-reducing rate was prepared. Background technique [0002] With the rapid development of the construction industry, new requirements are continuously put forward for the performance of concrete in various aspects, such as increasing the strength of concrete, improving the workability of fresh concrete, and reducing the slump loss of concrete during transportation. Ordinary concrete has been difficult to meet the new construction technology requirements. Adding admixtures to concrete is an effective, convenient and economical method to increase concrete strength and improve v...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/16
Inventor 邱学青欧阳新平杨东杰
Owner SOUTH CHINA UNIV OF TECH
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