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Efficient water reducing agent of amino-sulfonic acid and manufacturing process thereof

A high-efficiency water-reducing agent and sulfamic acid-based technology, applied in the field of water-reducing agent and its manufacturing process, can solve the problems of environmental pollution, influence stability, large changes in lignin composition, etc., reduce costs, improve mechanical properties and durability. performance, the effect of reducing pollution

Inactive Publication Date: 2006-01-04
HANGZHOU BUILDING SLAB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the components of this water reducer contain lignin sulfonate, and the lignin in lignosulfonate is directly related to the type of wood used as raw material and the age of the tree; therefore, the composition of lignin varies greatly and the molecular structure is complex , so that the performance of lignin sulfonate will be different, thus affecting the stability of the final product - sulfamic acid-based high-efficiency water reducer
Moreover, the content of free formaldehyde in the finished product is relatively high, which will cause environmental pollution and affect the health of construction workers to a certain extent.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: Production of liquid high-efficiency water reducer, its formula and production process steps are as follows:

[0020] 1), put 100 grams of phenol, 40 grams of urea, 130 grams of p-aminobenzenesulfonic acid, 40 grams of sodium metabisulfite, 307 grams of water, 240 grams of formaldehyde, 3 grams of ammonium persulfate, and 100 grams of sodium hydroxide into the reaction kettle , heated up to 70°C while stirring evenly, and reacted for 15 hours;

[0021] 2) Lower the temperature of the material in the reactor to 30°C, add sodium hydroxide, adjust the pH value of the mixture to 8.5, and stir evenly.

[0022] The above-mentioned liquid high-efficiency water reducer is subjected to spray drying treatment, and finally made into a powder product.

Embodiment 2

[0023] Embodiment 2: Production of liquid high-efficiency water reducer, its formula and production process steps are as follows:

[0024] 1), put 120 grams of benzylphenol, 80 grams of urea, 170 grams of sodium p-aminobenzenesulfonate, 40 grams of sodium bisulfite, 350 grams of water, 200 grams of p-phenylenedimethanol, and 5 grams of ammonium persulfate into the reaction In the kettle, heat up to 60°C while stirring evenly, and react for 15.5 hours;

[0025] 2) Lower the temperature of the materials in the reactor to 40°C, add sodium hydroxide, adjust the pH value of the mixture to 9, and stir evenly.

[0026] The above-mentioned liquid high-efficiency water reducer is subjected to spray drying treatment, and finally made into a powder product.

Embodiment 3

[0027] Embodiment 3: Production of liquid high-efficiency water reducer, its formula and production process steps are as follows:

[0028] 1), put 80 grams of hydroquinone, 60 grams of urea, 90 grams of diaminobenzenesulfonic acid, 30 grams of sodium sulfite, 310 grams of water, 220 grams of formaldehyde, 8 grams of ammonium persulfate, and 50 grams of sodium hydroxide into the reaction In the kettle, heat up to 80°C while stirring evenly, and react for 13 hours;

[0029] 2) Lower the temperature of the material in the reactor to 50°C, add sodium hydroxide, adjust the pH value of the mixture to 10, and stir evenly.

[0030] The above-mentioned liquid high-efficiency water reducer is subjected to spray drying treatment, and finally made into a powder product.

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PUM

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Abstract

The invention discloses a new amido-sulfonic acid system high-efficiency dehydrating agent and manufacturing technique, its formula components (weight): amido-aryl-sulfonic acid or amido-alkyl-sulfonic acid 80-180 shares, arylphenol or alkylphenol 50-120 shares, urea 40-80 shares, sulphonating agent 20-80 shares, condensing agent 180-300 shares, catalyst 2-10 shares, water 300-500 shares, and alkali 20-150 shares. The manufacturing technique includes the following steps: 1), uniformly blending all the components in the reacting kettle, where the alkali is 0-120 shares, heightening the temperature to 50-105 deg.C, and making sulphonation, polycondensation and disproportionation reaction for 2-16 hours. 2), lowering the temperature to 30-55 deg.C, adding in alkali to adjust the pH to 8.5-10.5, and uniformly stirring. Its dehydration rate is high and its alkali content is lower and its free formaldehyde content is low.

Description

Technical field: [0001] The invention belongs to a water reducing agent and its manufacturing process, more specifically a high-efficiency water reducing agent related to concrete and mortar and its manufacturing process. Background technique: [0002] Water reducer is the most widely used admixture in concrete. With the advancement of construction science and technology, high-performance concrete with high performance, good volume stability, high strength, high durability and other characteristics has become the development direction of concrete. Therefore, higher requirements are put forward for high-efficiency water reducer, an indispensable component material in high-performance concrete. It should not only have excellent dispersion and plasticization effects, but also be able to effectively reduce and prevent the loss of slump over time, so as to Meet the needs of construction technology. The currently used high-efficiency water reducers mainly include modified lignos...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/20C04B22/14C04B103/30
Inventor 李伏琦杨钧周虓
Owner HANGZHOU BUILDING SLAB