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Preparation method of ternary polymer molecular brush heavy metal scavenger

A heavy metal scavenger and ternary polymer technology, applied in chemical instruments and methods, water pollutants, flocculation/sedimentation water/sewage treatment, etc., can solve problems such as incomplete precipitation, low removal efficiency, and small precipitated particles , to achieve the effect of not easy secondary pollution, high removal efficiency and good stability

Active Publication Date: 2019-07-05
西安领伯环保科技有限公司
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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
The main problem of small molecular polysulfide compounds is that the precipitated particles generated are small, usually nano-scale precipitates, which are difficult to effectively separate and precipitate from industrial wastewater. Only by adding a large amount of polymer flocculant can sedimentation and separation be effective.

Method used

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  • Preparation method of ternary polymer molecular brush heavy metal scavenger
  • Preparation method of ternary polymer molecular brush heavy metal scavenger

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] It is a ternary polymer molecular brush polysulfide polymer, which is prepared by the following steps:

[0033] Step 1 P(GMA-N 3 ) Synthesis of polymer backbone A

[0034] Take 1 part of ethyl 2-bromoisobutyrate initiator, 800 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) was subjected to ATRP reaction at 30°C for 5 hours under nitrogen protection to obtain polyglycidyl methacrylate (PGMA) with a degree of polymerization (DP) of 700.

[0035] Take 100 parts of PGMA (DP=700), 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 the polymer backbone A;

[0036] Step 2 Synthesis of two side chains

[0037] Synthesis of hydrophilic polymer side chain C: Take 50 parts of monomethoxypolyethylene glycol (Mn=5000), 10 parts of 2-propynylacetic acid, and 10 parts of 4-dimethylaminopyridine (DMAP) , 10 parts...

Embodiment 2

[0045] The preparation method and raw material composition are all the same as in Example 1, only for the polymerization of polymer main chain A and polysulfide polymer side chain B of the ternary polymer molecular brush PGMA-g-(PDNTEMA-r-PEG) in Example 1 By adjusting the degree, heavy metal scavenger with different particle sizes can be prepared. 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.

[0046] The degree of polymerization of the polymer main chain A is 500, 600, 800, 900, 1000, the degree of polymerization of the polymer and the side chain B of the polysulfide polymer is 40, 80, 120, 190 and the degree of polymerization of the side chain C of the hydrophilic polymer for 114. It can be prepared according to the method of Example 1 by controlling the raw materials or the polymerization reaction time. The grafting ratios of PEG and PDNTEMA side ...

Embodiment 3

[0051] 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 ternary polymer molecular brush in Example 1, that is, the relative mole percentage of each side chain, can produce heavy metal scavenger with different particle sizes . See Table 2 for particle size variation.

[0052] Table 2: Effect of molecular brush side chain composition on particle size of heavy metal scavenger

[0053]

[0054] As can be seen from Table 2, 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 of binary polymer molecule brush heavy metal chelating agent. The preparation method is characterized by comprising steps of dissolving 5-10 parts by weight of binary polymer molecule brush in 10-50 parts of water; stirring for 1-10 hours under 20-30 DEG C, and obtaining micellar solution of nanometer heavy metal chelating agent. The invention solves the defects that the settling effect of heavy metal ion is bad and the settlement is completed by micromolecule polysulfide; every molecular chain can provide hundreds and even thousands of coordination sites to match and crosslink with heavy metal ions, and thereby obtaining micron order to millimeter aggregation, and effectively settling and separating from water body. The generated aggregation is good in stability, not easy to decompose and generate the 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 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 also widely used i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/56C08G81/02
CPCC02F1/56C02F2101/20C08G81/025
Inventor 不公告发明人
Owner 西安领伯环保科技有限公司
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