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Method for preparing biological water reducing agent via microwave radiation method

A microwave radiation method and bio-based technology, which is applied in the field of concrete admixtures, can solve the problems of high energy consumption, pollution of the living environment, and high carbon emissions, and achieve the effects of no three wastes, improved water reduction, work performance, and stable performance

Active Publication Date: 2014-06-04
BEIJING ACAD OF BUILDING ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, 90% of the water reducing agents on the market are produced by chemical raw materials from petrochemical and coal chemical industries, mainly including industrial naphthalene, polyether, formaldehyde, sulfuric acid, acrylic acid and other raw materials. This type of water reducing agent consumes a lot in the production process Fossil raw materials and fossil energy, the production process consumes a lot of energy and carbon emissions are high, especially naphthalene-based water reducers, residual carcinogens such as formaldehyde and heterocycles in the products, especially in residential buildings, have pollution to the living environment sex

Method used

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  • Method for preparing biological water reducing agent via microwave radiation method
  • Method for preparing biological water reducing agent via microwave radiation method
  • Method for preparing biological water reducing agent via microwave radiation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A bio-based water reducer prepared by microwave radiation method includes: corn starch: 20wt%; succinic anhydride: 3wt%; sulfamic acid: 5.3wt%; dimethyl sulfoxide: 11wt%; urea: 2.5wt%; Distilled water: 55wt%; Liquid caustic soda (30% concentration): 3.2wt%.

[0025] A method for preparing a bio-based water reducer by a microwave radiation method, the specific steps are as follows:

[0026] 1. Weigh 20g of cornstarch, place it in an oven and dry it at 100-110℃ for 2 hours to obtain pretreated starch;

[0027] 2. Weigh 3g of succinic anhydride, 5.3g of sulfamic acid, and 2.5g of urea into the reaction vessel, add 11g of dimethyl sulfoxide as the reaction medium, stir evenly, then add the pretreated starch in step 1, and mix well ;

[0028] 3. Put the above-mentioned mixed reaction materials in a microwave reactor, adjust the power to 350W, and react with microwave radiation for 12 minutes;

[0029] 4. After the material cools down to below 60°C, add 55g of distilled wa...

Embodiment 2

[0031] A kind of bio-based water reducing agent prepared by microwave radiation method includes: potato starch: 23wt%; maleic anhydride: 4.2wt%; chlorosulfonic acid: 5wt%; dichloromethane: 10wt%; p-aminobenzenesulfonic acid: 2wt%; distilled water: 66wt%; liquid caustic soda (30% concentration): 4wt%.

[0032] A method for preparing a bio-based water reducer by a microwave radiation method, the specific steps are as follows:

[0033] 1. Weigh 23g of potato starch and dry it in an oven at 100-110°C for 2 hours to obtain pretreated starch;

[0034] 2. Weigh 4.2g of maleic anhydride, 5g of chlorosulfonic acid, and 2g of p-aminobenzenesulfonic acid in a reaction vessel, add 10g of dichloromethane as the reaction medium, stir evenly, then add the pretreated starch in step 1, Mix well;

[0035] 3. Put the above-mentioned mixed reaction materials in a microwave reactor, adjust the power to 400W, and react with microwave radiation for 9 minutes;

[0036] 4. After the material cools ...

Embodiment 3

[0038] A bio-based water reducer prepared by microwave radiation method includes: sweet potato starch: 22wt%; oxalic acid: 4.8wt%; concentrated sulfuric acid: 5wt%; isopropanol: 14wt%; p-aminobenzenesulfonic acid: 1wt%; Distilled water: 51wt%; Liquid caustic soda (30% concentration): 4.2wt%.

[0039] 1. Weigh 22g of sweet potato starch and dry it in an oven at 100-110°C for 2 hours to obtain pretreated starch;

[0040] 2. Weigh 4.8g of oxalic acid, 5g of concentrated sulfuric acid, and 1g of p-aminobenzenesulfonic acid into the reaction container, add 14g of isopropanol as the reaction medium, stir evenly, then add the pretreated starch in step 1, and mix well ;

[0041] 3. Put the above-mentioned mixed reaction materials in a microwave reactor, adjust the power to 400W, and react with microwave radiation for 8 minutes;

[0042] 4. After the material cools down to below 60°C, add 51g of distilled water and stir for 30 minutes to dissolve it completely, then add 4.2g of liqui...

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Abstract

The invention discloses a method for preparing a biological water reducing agent via a microwave radiation method, and belongs to the technical field of concrete additives. The biological water reducing agent is prepared by leading hydrophilic groups with strong polarity onto starch molecules by utilizing special thermal effects of microwave radiation. The biological water reducing agent comprises the following components by weight percent: 20% to 75% of starch, 0% to 25% of esterifying agent, 3% to 30% of sulfonating agent, 0% to 45% of reaction medium, 0% to 5% of catalyst, 30% to 70% of distilled water and 1% to 5% of 30% caustic soda liquid. The method disclosed by the invention has the advantages that compared with the prior art, the method has the characteristics of being simple in operation process, high in reaction efficiency, low in energy consumption, environmentally friendly, pollution-free and the like. The biological water reducing agent prepared by using the method is stable in performance, high in water reducing rate, low in cost and strong in cement adaptability, and has the good compatibility and the good synergistic effect with a naphthalene water reducing agent or a polycarboxylate water reducing agent.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, in particular to a green and safe microwave radiation method for preparing bio-based water reducers. technical background [0002] Water reducer is the fifth component of concrete besides cement, sand, stone, and water. It is used in a small amount but has a large effect. In the next few decades, in my country's large-scale infrastructure construction, concrete will be the most important building material for modern urban construction, and concrete admixtures will be the core material of concrete. The development of key technologies for the application of green water reducing agents has a major role in promoting green buildings, durable buildings and energy-saving buildings. [0003] At present, 90% of the water reducing agents on the market are produced by chemical raw materials from petrochemical and coal chemical industries, mainly including industrial naphthalene, polyether, form...

Claims

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Application Information

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IPC IPC(8): C04B24/16C04B103/30
Inventor 王万金贺奎赖振峰马强李晓飞
Owner BEIJING ACAD OF BUILDING ENG
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