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Preparation method for heavy metal chelating agents of heat-sensitive ternary polymer molecule brushes

A heavy metal scavenger and ternary polymer technology, applied in chemical instruments and methods, water pollutants, water/sludge/sewage treatment, etc., can solve the problem that the capture performance cannot meet the national discharge standards of electroplating wastewater Table 3, sediment Easy to decompose, poor stability, low removal efficiency and other problems, to achieve the effect of not easy to secondary pollution, not easy to decompose, and good stability

Active Publication Date: 2017-03-15
重庆汇维仕新材料科技有限公司
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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 heavy metal chelating agents of heat-sensitive ternary polymer molecule brushes
  • Preparation method for heavy metal chelating agents of heat-sensitive ternary polymer molecule brushes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] It is a heat-sensitive ternary polymer molecular brush, which is prepared by the following steps:

[0035] Step 1 P(GMA-N 3 ) Synthesis of polymer backbone A

[0036] Take 1 part of ethyl 2-bromoisobutyrate initiator, 700 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 for 9 hours under the protection of nitrogen to obtain polyglycidyl methacrylate (PGMA) with a degree of polymerization (DP) of 600;

[0037] Take 100 parts of PGMA (DP=600), 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;

[0038] Step 2 Synthesis of three side chains

[0039] Synthesis of heat-sensitive polymer side chain C: take 1 part of propynyl bromoisobutyrate initiator, 300 parts of N-isopropylacrylamide (NIPAM), 200 parts of isopropanol and water (v / v,16 / 1), 2 pa...

Embodiment 2

[0048] Preparation method and raw material composition are all the same as embodiment one, only for the polymer main chain A and polysulfide of the thermosensitive ternary polymer molecular brush PGMA-g-(PDNTEMA-r-PNIPAM-r-PAM) of embodiment one The degree of polymerization of the polymer side chain B is adjusted to prepare heavy metal scavenger with different particle sizes. The degree of polymerization of the polymer main chain A and the polysulfide polymer side chain B, and the particle size of the heavy metal scavenger are shown in Table 1.

[0049] The degree of polymerization of the polymer main chain A is 500, 650, 750, 850, 950, the degree of polymerization of the side chain B of the polymer and the polysulfide polymer is 55, 85, 125, 175, and the degree of polymerization of the side chain C of the thermosensitive polymer The degree of polymerization of the flocculating polymer side chain D is 180 and 130. It can be prepared according to the method of Example 1 by con...

Embodiment 3

[0054] The preparation method and raw material composition are the same as in Example 1, only the grafting ratio of the thermosensitive polymer side chain C and the flocculation polymer side chain D of the thermosensitive ternary polymer molecular brush of Example 1 is changed, that is, each side chain Relative to the mole percentage, heavy metal scavengers with different sedimentation rates can be prepared. Sedimentation rate test conditions: with 10 mg / L of Pb 2+ 100 mL of ions was used as the test solution, and 0.10 mL of heavy metal scavenger was added to observe the change of sedimentation. The timing was started when the heavy metal scavenger was put in. When a large precipitation was observed, it was the sedimentation time. See Table 2 for the change of sedimentation time.

[0055] Table 2: Effect of molecular brush side chain composition on precipitation time of heavy metal scavenger

[0056]

[0057] It can be seen from Table 2 that heavy metal scavenger with diff...

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Abstract

The invention relates to a preparation method for heavy metal chelating agents of heat-sensitive ternary polymer molecule brushes. The preparation method is characterized by including the steps: dissolving 5-10 parts of heat-sensitive ternary polymer molecule brushes in 10-50 parts of water; mixing for 1-10 hours at the temperature ranging from 20 DEG C to 30 DEG C to obtain micellar solution of the heavy metal chelating agents of the heat-sensitive ternary polymer molecule brushes. The heat-sensitive ternary polymer molecule brushes comprise polymer side chains with three different functions, synergistic effect can be achieved when the molecule brushes capture heavy metal ions, and efficient capturing and rapid deposition functions are achieved. When heating temperature is higher than temperature of critical solution, millimeter-level aggregates are completely changed into hydrophobicity and rapidly deposited, and low-concentration heavy metal ions can be rapidly separated.

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 ternary polymer molecular brush 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 als...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/02C02F1/62C02F1/56
CPCC02F1/56C02F1/62C02F2101/20C08G81/021
Inventor 刘锋
Owner 重庆汇维仕新材料科技有限公司