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Preparation method for temperature-sensitive heavy-metal capturing agent

A heavy metal scavenger, heat-sensitive technology, applied in chemical instruments and methods, water/sludge/sewage treatment, water pollutants, etc., can solve the problems of incomplete precipitation, secondary pollution, low removal efficiency, etc. To achieve the effect of strong capture and sedimentation ability, not easy to secondary pollution, not easy to decompose

Active Publication Date: 2017-03-15
郴州市智存知识产权服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the first generation of heavy metal scavenger products, DTC derivatives are the most widely used products, but there is a defect that the generated precipitates are easy to decompose and have poor stability, resulting in secondary pollution problems
Tripolythiocyanate (TMT), as the second-generation heavy metal scavenger product, is also widely used in industrial wastewater treatment. Tripolythiocyanate contains three mercapto groups that can precipitate most heavy metal ions, but the precipitation is incomplete and the removal efficiency low level problem
Therefore, the capture performance of most heavy metal capture agents cannot meet the national discharge standards of electroplating wastewater Table 3

Method used

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  • Preparation method for temperature-sensitive heavy-metal capturing agent
  • Preparation method for temperature-sensitive heavy-metal capturing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] It is a heat-sensitive polymer molecular brush prepared by the following steps:

[0032] Step 1 P(GMA-N 3 ) Synthesis of polymer backbone A

[0033] Take 1 part of ethyl 2-bromoisobutyrate initiator, 1000 parts of glycidyl methacrylate (GMA), 1000 parts of diphenyl ether, 5 parts of CuBr and 5 parts of N, N, N', N',N"-pentamethyldiethylenetriamine (PMDETA), ATRP reaction was carried out at 30°C under nitrogen protection for 9 hours to obtain polyglycidyl methacrylate (PGMA) with a degree of polymerization (DP) of 900;

[0034] Take 100 parts of PGMA (DP=900), 200 parts of NaN 3 and 300 parts of dimethylformamide (DMF), reacted at 60°C for 50 hours to obtain P(GMA-N 3 ), as polymer backbone A;

[0035] Step 2 Synthesis of two side chains

[0036] Synthesis of heat-sensitive polymer side chain C: take 1 part of propynyl bromoisobutyrate initiator, 300 parts of N-isopropylacrylamide (NIPAM), 100 parts of isopropanol and water (v / v,16 / 1), 2 parts of CuBr and 2 parts ...

Embodiment 2

[0044] Preparation method and raw material composition are all the same as embodiment one, only for the polymer main chain A and polysulfide polymer side chain B of the thermosensitive polymer molecular brush PGMA-g-(PDNTEMA-r-PNIPAM) of embodiment one By adjusting the degree of polymerization, heat-sensitive heavy metal scavenger with different particle sizes can be prepared. The degree of polymerization of the polymer main chain A and the side chain B of the polysulfide polymer, and the particle size of the heat-sensitive heavy metal scavenger are shown in Table 1.

[0045] Polymers with a degree of polymerization of the polymer main chain A of 500, 600, 700, 800, 1000 and polymers with a degree of polymerization of the polysulfide polymer side chain B of 40, 90, 160, 190 and heat-sensitive polymer side chains C The degree of polymerization was 180. It can be prepared according to the method of Example 1 by controlling the raw materials or the polymerization reaction time. ...

Embodiment 3

[0050] The preparation method and raw material composition are the same as in Example 1, only changing the grafting rate of the side chains of the thermosensitive polymer molecular brushes in Example 1, that is, the relative molar percentage of each side chain, can produce thermosensitive brushes with different particle sizes. heavy metal scavenger. See Table 2 for particle size variation.

[0051] Table 2: Effect of molecular brush side chain composition on the particle size of heat-sensitive heavy metal scavenger

[0052]

[0053] It can be seen from Table 2 that heat-sensitive heavy metal scavenger with different particle sizes can be prepared by changing the molar percentage of the grafting ratio of the side chain.

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Abstract

The invention relates to a preparation method for a temperature-sensitive heavy-metal capturing agent. The preparation method is characterized by comprising the following steps: dissolving 5 to 10 parts of a temperature-sensitive polymer molecular brush in 10 to 50 parts of water; and carrying out stirring at 20 to 30 DEG C for 1 to 10 h so as to obtain a micellar solution of the nanometer temperature-sensitive heavy-metal capturing agent. The temperature-sensitive heavy-metal capturing agent overcomes the problem of difficult treatment of waste water with ultra-low concentration heavy metal ions; since the temperature-sensitive polymer molecular brush contains a polysulfur polymer and each molecular chain can provide hundreds of coordination sites for coordination and crosslinking with heavy metal ions, micro-nano-structured aggregate can be obtained; temperature is further increased, so the hydrophobicity of the micro-nano-structured aggregate is improved and can thus be separated from sediments in a water body; and the produced has good stability, is not prone to decomposition and hardly produces secondary pollution.

Description

technical field [0001] The invention belongs to the field of water treatment technology and polymer functional materials, and in particular relates to a preparation method of a heat-sensitive heavy metal scavenger. Background technique [0002] Heavy metal ion scavenger is an organic compound with chelating functional groups, which can selectively capture, separate and precipitate heavy metals from solutions containing metal ions. At present, the heavy metal scavengers that are widely used mainly include dithiocarbamate derivatives (DTC), tripolythiocyanate (TMT), and small molecular polysulfide compounds. As the first generation of heavy metal scavenger products, DTC derivatives are the most widely used products, but there is a defect that the generated precipitates are easy to decompose and have poor stability, resulting in secondary pollution problems. Tripolythiocyanate (TMT), as the second-generation heavy metal scavenger product, is also widely used in industrial wast...

Claims

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Application Information

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IPC IPC(8): C08G81/02C08F120/32C08F8/30C08F120/54C08F120/38C08J3/00C02F1/56C02F101/20
CPCC02F1/56C02F2101/20C08F8/30C08F120/32C08F120/38C08F120/54C08G81/021C08J3/00C08J2387/00
Inventor 刘锋
Owner 郴州市智存知识产权服务有限公司
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