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Watersoluble polyurethane adsorption agent containing sulfhydryl group for removing hydrargyrum and preparation method thereof

A water-based polyurethane and adsorbent technology, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., to achieve wide application prospects, improve adsorption performance, and simple process effects

Inactive Publication Date: 2008-10-29
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] At present, there are no public literature reports and patent applications about a preparation method of a mercapto-containing water-based polyurethane adsorbent for mercury removal at home and abroad.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] With isophorone diisocyanate, adipic acid polyester polyol, 2,2'-dimethylol propionic acid, dibutyltin dilaurate and acetone in a ratio of 100:360:40:2:400 (by weight) The proportion is mixed evenly, and the temperature is raised to 60°C for 8 hours to make the reaction tend to be completed, that is, the isocyanate-terminated polyurethane prepolymer is obtained; then the isocyanate-terminated polyurethane prepolymer, 1,4-butanediol, dibutyltin di Laurate and acetone, with the ratio of 100:12:1:100 (weight), stir evenly, the temperature is controlled at about 60°C, the reaction continues for 5 hours, then add 3g of triethylamine, the temperature is reduced to 45°C, and the reaction is 30 minute. Measure 125ml of deionized water and slowly add it dropwise to the above mixture, keeping the entire dropping time for 45 minutes. After the dropwise addition was completed, the reaction was continued for another 30 minutes. After removing the acetone under vacuum at 35°C, an a...

Embodiment 2

[0034] Same as Example 1, but the consumption of thiochloropropane changes from 20mL to 30mL, and the content of mercapto groups in the adsorbent measured by the silver-returning titration method is 1.28×10 -3 mmol / g.

Embodiment 3

[0036] Same as Example 1, but the consumption of thiochloropropane changes from 20mL to 10mL, and the content of mercapto groups in the adsorbent measured by the silver-returning titration method is 4.24×10 -4 mmol / g.

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Abstract

The present invention pertains to the technical field of wastewater treatment, in particular to hydrophilic polyurethane absorbent containing sulfhydryl for removing Hg and a preparation method thereof. The present invention takes water and volatile non-water solvent as the mixed solvent, introduces chloromethyl thiirane monomer as the cross linking agent into hydrophilic polyurethane dispersion dope and finally carries out coating and solidification, thus obtaining the hydrophilic polyurethane absorbent containing sulfhydryl. The present invention has the advantages of simple and convenient technique, high production efficiency, high product quality and low cost. The composition of the prepared absorbent is controllable with the size of 50 to 250mm, the prepared absorbent has the advantages of large specific surface area, strong Hg-ion absorption capacity and rapid absorption rate. In addition, the present invention with excellent high-concentration Hg-ion absorption capacity and trace Hg-ion absorption capacity, good mechanical property and damage ratio lower than 0.5 percent after being used for a plurality of times can be applied to Hg, lead, cadmium and other heavy metal industrial wastewater treatment within a more extensive concentration range.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a mercapto-containing water-based polyurethane adsorbent for mercury removal and a preparation method thereof. Background technique [0002] Mercury is widely used in industrial fields such as papermaking, paint, cosmetics, preservatives, thermometers, pressure gauges, fluorescent lamps and batteries. At the same time, mercury will also bring a serious environmental pollution problem. Among all industrial heavy metal wastewater discharges, mercury is a pollutant that has the greatest impact on the environment. It is estimated that the newly increased mercury pollution from nature, man-made and ocean sprays is as high as 5,500 tons every year in the world. Therefore, the treatment of mercury-containing wastewater is directly related to human physical and mental health. How to efficiently deal with mercury has become an extremely important problem facing h...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/30C02F1/62C02F1/28
Inventor 杨正龙
Owner TONGJI UNIV
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