A kind of anti-pollution modified polyvinyl chloride composite film and preparation method thereof

A polyvinyl chloride and composite membrane technology, which is applied in the field of composite membranes, can solve the problems such as the decrease of membrane permeability and retention rate, and the loss of use function of water resources, so as to improve the permeability and retention rate of membrane body, which is conducive to coping with The effect of water system impact and anti-pollution performance

Active Publication Date: 2022-04-12
江苏瑞亿扬材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] We call the polluted discharge water from life and production as sewage. Because the water quality is mixed with new material components, or due to changes in external conditions, the original water resources lose their original use functions. In order to maintain the environment Friendly, we need to treat the sewage to make the water quality reach a certain use standard. The common technical means is to use membrane valence to filter, and polyvinyl chloride has excellent physical and chemical stability and film-forming performance, and can produce better performance for water treatment However, due to the hydrophobicity of polyvinyl chloride itself, it is easy to adsorb amphiphilic substances such as proteins, which leads to the adsorption of pollutants in the membrane body during the separation process of water treatment, resulting in a decrease in the permeability and rejection rate of the membrane body

Method used

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  • A kind of anti-pollution modified polyvinyl chloride composite film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] (1) Preparation of the first functional layer:

[0050] Take 1 part of carboxymethyl cellulose and add pure water to make carboxymethyl cellulose solution; take aluminum hydroxide and add pure water and polyethylene glycol, add nitric acid after heating up, stir to make alumina sol, add carboxymethyl cellulose plain solution, 0.5 part of glycerin, 1 part of titanium dioxide, and stir evenly to obtain modified alumina, wherein 4 parts of alumina;

[0051] Take 100 parts of polyvinyl chloride and add N,N-dimethylacetamide to dissolve, add 8 parts of vinyl caprolactam, cuprous chloride, pentamethyldipropylenetriamine in a nitrogen atmosphere, and place at a temperature of 70 ° C Carrying out the reaction to obtain modified polyvinyl chloride;

[0052] Dissolve modified polyvinyl chloride in N,N-dimethylacetamide, add modified alumina and 3 parts of sorbitan polyoxyethylene ester, co-extrude the film, and perform single-sided coating on the upper surface of the film body. ...

Embodiment 2

[0067] (1) Preparation of the first functional layer:

[0068] Take 2 parts of carboxymethyl cellulose and add pure water to make carboxymethyl cellulose solution; take aluminum hydroxide, add pure water and polyethylene glycol, add nitric acid after heating up, stir to make alumina sol, add carboxymethyl cellulose plain solution, 1 part of glycerin, 1.5 parts of titanium dioxide, and stir evenly to obtain modified alumina, wherein 7 parts of alumina;

[0069] Take 100 parts of polyvinyl chloride and add N,N-dimethylacetamide to dissolve, add 24 parts of vinyl caprolactam, cuprous chloride, pentamethyldipropylene triamine in a nitrogen atmosphere, and place at a temperature of 70°C Carrying out the reaction to obtain modified polyvinyl chloride;

[0070] Dissolve modified polyvinyl chloride in N,N-dimethylacetamide, add modified alumina and 4 parts of sorbitan polyoxyethylene ester, co-extrude the film, and perform single-sided coating on the upper surface of the film body. ...

Embodiment 3

[0085] (1) Preparation of the first functional layer:

[0086] Take 3 parts of carboxymethyl cellulose and add pure water to make carboxymethyl cellulose solution; take aluminum hydroxide and add pure water and polyethylene glycol, add nitric acid after heating up, stir to make alumina sol, add carboxymethyl cellulose Plain solution, 1.5 parts of glycerin, 2 parts of titanium dioxide, stir evenly, make modified alumina, wherein 10 parts of alumina;

[0087] Take 100 parts of polyvinyl chloride and add N,N-dimethylacetamide to dissolve, add 40 parts of vinyl caprolactam, cuprous chloride, pentamethyldipropylene triamine in a nitrogen atmosphere, and place at 70°C Carrying out the reaction to obtain modified polyvinyl chloride;

[0088] Dissolve modified polyvinyl chloride in N,N-dimethylacetamide, add modified alumina and 5 parts of sorbitan polyoxyethylene ester, co-extrude the film, and perform single-sided coating on the upper surface of the film body. Heating at 120°C, sp...

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Abstract

The invention discloses an anti-pollution modified polyvinyl chloride composite membrane and a preparation method thereof. The composite membrane includes a first functional layer, central particles and a second functional layer, and the first functional layer is located on the second functional layer. Above, the central particle is located between the first functional layer and the second functional layer, and the average pore diameters of the first functional layer, central particle and second functional layer gradually decrease. In the present invention, through the arrangement of the composite membrane structure, the first functional layer, the central particle and the second functional lamination structure with the average pore diameter gradually decreasing from top to bottom are formed, and the first functional layer is asymmetrical with the pore diameter gradually decreasing from top to bottom. Membrane layer, making a double asymmetric structure, relieves the negative pressure brought by the water system during water treatment, prevents organic substances such as proteins from entering the pores with the water flow, and flows to the lower surface of the composite membrane, and the pores with narrowed average pore size are easy to absorb proteins, etc. The removal of organic substances is more conducive to the realization of the anti-pollution performance of the composite membrane.

Description

technical field [0001] The invention relates to the technical field of composite membranes, in particular to an anti-pollution modified polyvinyl chloride composite membrane and a preparation method thereof. Background technique [0002] We call the polluted discharge water from life and production as sewage. Because the water quality is mixed with new material components, or due to changes in external conditions, the original water resources lose their original use functions. In order to maintain the environment Friendly, we need to treat the sewage to make the water quality reach a certain use standard. The common technical means is to use membrane valence to filter, and polyvinyl chloride has excellent physical and chemical stability and film-forming performance, and can produce better performance for water treatment However, due to the hydrophobicity of polyvinyl chloride itself, it is easy to adsorb amphiphilic substances such as proteins, which leads to the adsorption ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/12B01D71/30B01D67/00
CPCB01D69/12B01D71/30B01D69/02B01D67/0093
Inventor 赖枝帅
Owner 江苏瑞亿扬材料科技有限公司
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