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Polyamide high-flux composite loose nanofiltration membrane and preparation method thereof

A polyamide membrane and nanofiltration membrane technology, which is applied in the field of preparation of polyamide high-flux composite loose nanofiltration membranes, can solve the problems of low filtration precision, low membrane flux, and decreased filtration performance.

Pending Publication Date: 2020-07-31
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, the nanofiltration membrane used to treat printing and dyeing wastewater will shrink when heated, and the filtration performance will decrease during use, and the flux of the membrane is low and the filtration accuracy is not high.

Method used

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  • Polyamide high-flux composite loose nanofiltration membrane and preparation method thereof
  • Polyamide high-flux composite loose nanofiltration membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A preparation method of polyamide high flux composite loose nanofiltration membrane, the steps are as follows:

[0023] (1) Treat the polyamide film with plasma;

[0024] (2) Immerse the polyamide film treated in step (1) in a carboxymethyl cellulose solution with a concentration of 1 wt% for heat treatment, the heat treatment temperature is 40°C, the treatment time is 3h, and dry at room temperature after treatment;

[0025] (3) Place the polyamide film dried in step (2) in a mixed solution of polyvinyl alcohol and p-hydroxybenzyl alcohol, the mass ratio of polyvinyl alcohol and p-hydroxybenzyl alcohol is 3:1; the temperature of the water bath is raised to 30°C, Add nano-silica and sodium hexametaphosphate to react, the mass ratio of polyvinyl alcohol to nano-silica is 2:1, the mass of sodium hexametaphosphate is 5% of polyvinyl alcohol, react for 1 hour and dry to obtain composite loose Nanofiltration.

Embodiment 2

[0027] A preparation method of polyamide high flux composite loose nanofiltration membrane, the steps are as follows:

[0028] (1) Treat the polyamide film with plasma;

[0029] (2) Immerse the polyamide film treated in step (1) in a carboxymethylcellulose solution with a concentration of 2wt% for heat treatment, the heat treatment temperature is 50°C, the treatment time is 4h, and dry at room temperature after treatment;

[0030] (3) Place the polyamide film dried in step (2) in a mixed solution of polyvinyl alcohol and p-hydroxybenzyl alcohol, the mass ratio of polyvinyl alcohol and p-hydroxybenzyl alcohol is 5:1; the temperature of the water bath is raised to 35°C, Add nano-silica and sodium hexametaphosphate to react, the mass ratio of polyvinyl alcohol and nano-silica is 3:1, the mass of sodium hexametaphosphate is 8% of polyvinyl alcohol, react for 1.5h and then dry to get composite Loose nanofiltration membrane.

Embodiment 3

[0032] A preparation method of polyamide high flux composite loose nanofiltration membrane, the steps are as follows:

[0033] (1) Treat the polyamide film with plasma;

[0034] (2) Immerse the polyamide film treated in step (1) in a carboxymethylcellulose solution with a concentration of 3wt% for heat treatment, the heat treatment temperature is 60°C, the treatment time is 5h, and dry at room temperature after treatment;

[0035] (3) Place the polyamide film dried in step (2) in a mixed solution of polyvinyl alcohol and p-hydroxybenzyl alcohol, the mass ratio of polyvinyl alcohol and p-hydroxybenzyl alcohol is 6:1; the temperature of the water bath is raised to 40°C, Add nano silicon dioxide and sodium hexametaphosphate to react, the mass ratio of polyvinyl alcohol and nano silicon dioxide is 2-4:1, the quality of sodium hexametaphosphate is 10% of polyvinyl alcohol, react for 2 hours and dry to get Composite loose nanofiltration membrane.

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Abstract

The invention provides a preparation method of a polyamide high-flux composite loose nanofiltration membrane. The preparation method comprises the following steps: (1) treating a polyamide membrane byutilizing plasma; (2) immersing the polyamide membrane treated in the step (1) into a carboxymethyl cellulose solution for heat treatment, and airing at room temperature after treatment; and (3) placing the polyamide membrane dried in the step (2) into a modification solution for modification treatment to obtain the composite loose nanofiltration membrane. According to the preparation method, thepolyamide membrane is pretreated by utilizing plasma, the plasma can perform surface pretreatment on polyamide, and then through modification treatment, the stability of the membrane is improved, andthe flux is improved.

Description

technical field [0001] The invention relates to the field of nanofiltration membrane preparation, in particular to a preparation method of a polyamide high-flux composite loose nanofiltration membrane. Background technique [0002] Nanofiltration is a new type of membrane separation technology developed in the late 1980s. Its relative molecular weight cut-off is between 200 and 2000, and the membrane pore size is about 1 nm. The separation process is carried out at room temperature, and no phase change and chemical reaction will occur, so it will not damage the biological cleanliness of the isolate. At the same time, due to the pore size screening and charge repulsion, it can effectively intercept high-valent metal ions and high relative molecular weight. Small organic molecules over 200. Compared with reverse osmosis, the operating pressure required by nanofiltration is low, and it has greater application potential in the production of high-quality drinking water and food,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D61/02B01D69/12B01D71/56B01D69/08
CPCB01D61/027B01D67/0083B01D67/0093B01D69/08B01D69/12B01D71/56B01D2325/22
Inventor 彭东来王战中张亚涛钱恒玉王景张治红李瑞冯孝权朱军勇
Owner ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY