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Flocculant of cation of millicron SiOx compound polyacrylamide and preparing method thereof

A technology of polyacrylamide cation and polyacrylamide, which is applied in the field of nano-SiOx composite polyacrylamide cation flocculant and its preparation, can solve the problems of poor dispersion effect and influence of nano-particle dispersion, so as to improve flocculation performance and reduce absorption degradation Function, improve the effect of adsorption and bridging function

Inactive Publication Date: 2007-08-15
牛晓军 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the agglomeration of nanoparticles affects their dispersion in polymer materials, and it is difficult to disperse uniformly in polymer systems only by physical mixing.
[0004] Disclosed in the Chinese patent application CN1303821A is a kind of "nano ultra-high-efficiency flocculant", which is made of SiOx and Al 2 o 3 and other metal oxide nanoparticles are dispersed in various polyacrylamide flocculants by mechanical stirring; due to SiOx and Al 2 o 3 The agglomeration of metal oxide nanoparticles makes the dispersion effect in the polymer flocculant poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034]A kind of nano-SiOx composite polyacrylamide cationic flocculant, this flocculant is to add the nano-SiOx modified through (γ-epoxypropylene) propyl group-triethoxysilane when the known preparation polyacrylamide technology, In the formula, x is 1.2-1.6, and use ammonium sulfate aqueous solution and N, N, N', N'-tetramethylethylenediamine initiator aqueous solution to initiate radical aqueous solution polymerization to obtain nano-SiOx composite polyacrylamide hydrogel, and then Nano-SiOx composite polyacrylamide hydrogel was modified by Mannich cationic reaction with formaldehyde, dimethylamine and ethyl bromide to obtain nano-SiOx composite polyacrylamide cationic flocculant.

[0035] The preparation method of above-mentioned flocculant comprises the steps:

[0036] (1) Surface modification and modification of nano-SiOx particles

[0037] Take the nano-SiOx of DP1 in the container, add absolute absolute ethanol to the nano-SiOx at a volume ratio of 1:1.5 to soak, and ...

Embodiment 2

[0045] Storage stability test of nano-SiOx composite polyacrylamide cationic flocculant:

[0046] After 2% concentration of nano-SiOx composite polyacrylamide cationic flocculant was placed at room temperature for 4 months, the flocculation performance of kaolin artificial simulated sewage was measured, and the settling time was 11.5 seconds; a certain concentration of SiOx nanocomposite polyacrylamide cationic flocculant After the aqueous solution of the agent was frozen at -12°C for one week, the initial settling time of the flocs was measured to be 11.3 seconds, and the transparency of the water body remained basically unchanged, which was basically the same as the settling of the instant-configured nano-SiOx composite polyacrylamide cationic flocculant Speed ​​(9.8 seconds), while its appearance and viscosity are basically unchanged, showing good anti-aging performance.

Embodiment 3

[0048] Coagulation performance test of nano-SiOx composite polyacrylamide cationic flocculant:

[0049] Coagulation experiments were carried out in the laboratory by collecting urban domestic sewage, catalyst wastewater from petroleum refining companies, and metal smelting production wastewater. The results show that the SiOx nanocomposite polyacrylamide cationic flocculant has fast flocculation speed, good removal rate of SS in three kinds of wastewater, and can partially remove COD and NH in the aforementioned wastewater 4 + -N, showing good coagulation properties. The results are shown in the data listed in Table 1, Table 2 and Table 3.

[0050] 1) Urban domestic sewage Appearance: light yellow, with black suspended matter, water temperature: 19°C. There is a pungent stench, and the whole water body has a certain viscosity, pH: about 7.6.

[0051] Table 1 Results of urban domestic sewage treatment

[0052] indicators

raw water

treated water

Removal...

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Abstract

The composite nano SiOx / polyacrylamide cation flocculant is prepared through surface modification of nano SiOx with coupling agent, dispersing modified SiOx water solution containing acrylamide, initiating free radical solution polymerization with composite initiator to obtain nano composite SiOx / polyacrylamide gel, and final functional Mannich reaction of the gel with HCHO, HN(CH3)2 and BrCH2CH3 to obtain the composite nano SiOx / polyacrylamide cation flocculant. The flocculant has moderate molecular weight, fast flocculating speed, good antiageing degradation performance, less residual monomer and other features.

Description

technical field [0001] The invention relates to a cationic flocculant in water treatment, in particular to a nano-SiOx composite polyacrylamide cationic flocculant and a preparation method thereof. Background technique [0002] Flocculation and coagulation are important technical links in the process of sewage treatment. In some cases, the process of flocculation and coagulation alone can complete wastewater treatment alone. Therefore, flocculants and coagulants are important aspects of the research and development of new wastewater treatment processes and new materials, and the corresponding products are huge in quantity and variety. Compared with other flocculants, polyacrylamide and its derivatives flocculants have the advantages of less dosage, fast flocculation speed, and less sludge generation. They are widely used in water treatment, especially wastewater treatment, and are still in rapid development. Polyacrylamide is prepared by free radical aqueous polymerization...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/56
Inventor 李彦锋姜鸿基周林成李贤真牛晓军
Owner 牛晓军
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