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Adsorbent and preparation method and application thereof

A technology of adsorbent and polymer chelating agent, which is applied in the field of adsorbent and its preparation, can solve the problems of inability to completely eliminate the influence of polymerization reaction, content reduction, and influence on the quality of synthetic water reducing agent.

Active Publication Date: 2016-12-21
ZHEJIANG HUANGMA TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In recent years, with the rapid development of concrete technology and the construction industry, the demand for polycarboxylate superplasticizers has been increasing. The synthesis process of polycarboxylate superplasticizers is a free radical polymerization reaction, and a large amount of water is required in the reaction process. solvents, but untreated industrial water contains small amounts of Ca 2+ , Mg 2+ , Fe 2+ , Zn 2+ Plasma, Ca 2+ , Mg 2+ The ions are easy to interact with the reaction components to form insoluble salts, which have a certain polymerization inhibition effect. Zn 2+ , Fe 2+ Plasma is reductive, and it is easy to act on the oxidation-reduction initiation system of the polymerization reaction, resulting in a decrease in the number of free radicals, seriously affecting the quality of the synthetic water reducer, and deepening the color of the product
[0003] The water commonly used in the synthesis process of water reducer is industrial water treated by ion exchange method. A specific cation exchange resin is used to replace the calcium and magnesium ions in the water with sodium ions to reduce the influence of calcium and magnesium ions on the synthesis reaction. The industrial water treated by this method still contains a certain amount of Ca 2+ , Mg 2+ , Fe 2+ , Zn 2+ ion, can not completely eliminate its influence on the polymerization reaction, in order to overcome the above-mentioned shortcoming, the present invention provides a kind of adsorbent, removes the remaining Ca in the synthetic use water by adsorption precipitation 2+ , Mg 2+ , Fe 2+ , Zn 2+ ions, reducing its content to trace levels, and eliminating the influence on the synthesis reaction of polycarboxylate superplasticizers

Method used

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  • Adsorbent and preparation method and application thereof
  • Adsorbent and preparation method and application thereof
  • Adsorbent and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: The adsorbent prepared under different processes

[0025] Weigh 1,4 butanediamine and diphenol-based methane epoxy resin and put it into a four-necked flask equipped with a stirrer, a thermometer and a reflux device. Under the condition of ethanol as a solvent, the water-bath heating reaction, the diphenol-based methane epoxy resin is divided into Feed 3 times, control the reaction temperature to 55°C, and keep stirring for 1 hour after feeding. Then weigh a certain amount of phosphorous acid into the reaction solution, raise the temperature in a water bath to 65° C., and add 10% carbon disulfide ethanol solution dropwise while stirring under the condition of ethanol reflux. The dropping time is 3 hours. Then add a small amount of sodium hydroxide solid, stir for 10 minutes, and then distill under reduced pressure to remove the ethanol solvent and small molecular substances in the reaction solution. The remaining product is vacuum-dried at 50°C to obtain a...

Embodiment 2

[0030] Example 2: The adsorption effect of adsorbents with different process indicators on ions in water

[0031] Study the effect of adsorbents A1, A2, A3, A4, A5 on Ca in water 2+ , Mg 2+ , Zn 2+ , Fe 2+ ion adsorption. Measure six parts of 1L polycarboxylate water reducer synthesis water, No. 1-6 for later use, weigh 0.4g of adsorbents A1-A5 respectively, add into water for water reducer No. 1-5, No. 6 does not add adsorbent As a blank group, after stirring at room temperature for 1 hour, let it stand still, and test the time from the appearance of precipitation in the water to the complete precipitation. After the precipitation is complete, filter and measure the Ca of the filtrate by atomic absorption spectrometry 2+ , Mg 2+ , Zn 2+ , Fe 2+ Ion concentration, each sample was measured three times to take the average value, and the data records are shown in Table 2.

[0032] Table 2 Ion content and precipitation complete time of water after adsorbent treatment

[...

Embodiment 3

[0036] Embodiment 3: The adsorbent prepared under different processes

[0037]Weigh 1,4 butanediamine and diphenol-based methane epoxy resin and put it into a four-necked flask equipped with a stirrer, a thermometer and a reflux device. Under the condition of ethanol as a solvent, the water-bath heating reaction, the diphenol-based methane epoxy resin is divided into Feed 3 times, control the reaction temperature to 55°C, and keep stirring for 1 hour after feeding. Then weigh a certain amount of phosphorous acid into the reaction solution, raise the temperature in a water bath to 65° C., and add 10% carbon disulfide ethanol solution dropwise while stirring under the condition of ethanol reflux. The dropping time is 3 hours. Then add a small amount of sodium hydroxide solid, stir for 10 minutes, and then distill under reduced pressure to remove the ethanol solvent and small molecular substances in the reaction solution. The remaining product is vacuum-dried at 50°C to obtain a ...

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Abstract

The invention relates to an adsorbent and a preparation method and application thereof and belongs to the technical field of organic polymer compounds. The adsorbent is a mixture and is made mainly from a polymer chelating agent, modified chitosan, polyacrylamide, sodium metaaluminate and the like. The adsorbent synthesized in the application is used in the field of synthesis of water-reducing agents and can decrease the total content of Ca2+ and Mg2+ in water to 0.3 mg / L and below and the total content of Zn2+ and Fe2+ to 0.05 mg / L and below.

Description

technical field [0001] The invention relates to an adsorbent and its preparation method and application, belonging to the technical field of organic polymer compounds. Background technique [0002] In recent years, with the rapid development of concrete technology and the construction industry, the demand for polycarboxylate superplasticizers has been increasing. The synthesis process of polycarboxylate superplasticizers is a free radical polymerization reaction, and a large amount of water is required in the reaction process. solvents, but untreated industrial water contains small amounts of Ca 2+ , Mg 2+ , Fe 2+ , Zn 2+ Plasma, Ca 2+ , Mg 2+ The ions are easy to interact with the reaction components to form insoluble salts, which have a certain polymerization inhibition effect. Zn 2+ , Fe 2+ Plasma is reductive, and it is easy to act on the oxidation-reduction initiation system of the polymerization reaction, resulting in a decrease in the number of free radicals, s...

Claims

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Application Information

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IPC IPC(8): B01J20/22B01J20/30C02F1/28C02F101/20C02F103/38
CPCB01J20/223C02F1/285C02F2101/20C02F2101/203C02F2103/38
Inventor 陈世明金一丰董楠万庆梅糜泽峰
Owner ZHEJIANG HUANGMA TECH
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