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Preparation method of molecular sieve micro powder-modified polyvinylidene fluoride membrane

A polyvinylidene fluoride membrane, modification and modification technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., to achieve the effect of simple membrane production process, easy industrialization implementation, and reduced defects

Inactive Publication Date: 2014-06-18
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the use of surface-modified inorganic particles to modify polyvinylidene fluoride membrane materials, adjust inorganic-organic compatibility, and develop polyvinylidene fluoride membranes with anti-pollution functions has not been reported.

Method used

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  • Preparation method of molecular sieve micro powder-modified polyvinylidene fluoride membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Preparation of surface-modified molecular sieves: 13X molecular sieves were dried to constant weight and ground into powder. Add 1 g of dry 13X molecular sieve to 100 mL of sodium stearate solution with a concentration of 0.02 mol / L, react at 60°C for 1 hour, suction filter after the reaction, wash, and dry at 80°C to obtain surface-modified molecular sieve 13X-M -1.

[0020] Preparation of modified polyvinylidene fluoride membrane: Mix 0.4g of the above-mentioned molecular sieve powder 13X-M-1 with 7.0g of polyvinylidene fluoride and 3.0g of polyethylene glycol (M6000) in 40mL of solvent dimethylacetamide. Fully stir at 60°C until the polyvinylidene fluoride is completely dissolved to obtain a uniform casting solution. At 60°C, let stand at constant temperature for defoaming for 12 hours. Pour the casting solution on a glass plate, scrape it into a flat film with a thickness of about 250 microns, put it in deionized water at room temperature, solidify and form it, an...

Embodiment 2

[0022] Preparation of surface-modified molecular sieves: 13X molecular sieves were dried to constant weight and ground into powder. Add 1 g of dry 13X molecular sieve to 100 mL of cetyltrimethylammonium bromide solution with a concentration of 0.04 mol / L, react at 60 °C for 1 h, suction filter after the reaction, wash, and dry at 80 °C to obtain the surface Modified molecular sieve 13X-M-2.

[0023] Preparation of modified polyvinylidene fluoride membrane: Mix 0.6g of the above-mentioned molecular sieve fine powder with 7.0g polyvinylidene fluoride and 6.0g polyethylene glycol (M6000) in 37.0mL solvent dimethylacetamide, fully Stir until the polyvinylidene fluoride is completely dissolved to obtain a uniform casting solution. At 60°C, let stand at constant temperature for defoaming for 12 hours. Pour the casting solution on a glass plate, scrape it into a flat film with a thickness of about 250 microns, put it in deionized water at room temperature, solidify and form it, and...

Embodiment 3

[0024] Embodiment 3, test effect:

[0025] The conventional PVDF membrane and the two anti-fouling PVDF membranes of the present invention were used for performance testing.

[0026] Use 0.1g / L bovine serum albumin (BSA) solution as the retentate, record the absorbance of the permeate at 278nm at 0.1MPa, query the standard curve to determine its concentration, and calculate the retentivity. Protein is the main food source of bacteria, and its interception can make the bacteria die out naturally.

[0027] The mechanical properties of the film are measured by tensile experiments, and important mechanical properties such as elongation at break are obtained. Test conditions: cut into 5mm wide sample film, gauge 40mm, speed 50mm / min, room temperature. The average value of 3 tests was taken.

[0028] The hydrophilicity of the film is determined by measuring the contact angle, the smaller the contact angle, the stronger the hydrophilicity.

[0029] It can be seen from Table 1 tha...

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Abstract

The invention discloses a preparation method of a molecular sieve micro powder-modified polyvinylidene fluoride membrane, and belongs to the field of polymer modification. Firstly a surface active substance is utilized for surface modification of a 13X molecular sieve micro-powder, an X-type molecular sieve having good inorganic-organic compatibility is prepared, then the X-type molecular sieve is co-mixed with polyvinylidene fluoride to prepare the membrane, and thus the modified polyvinylidene fluoride membrane is obtained. Due to strong hydrophilicity of the molecular sieve material, the hydrophilicity of the polyvinylidene fluoride membrane modified by the method is promoted, adsorption of proteins and other organic matters on the surface of the membrane is reduced, and the anti-pollution ability of the polyvinylidene fluoride membrane is improved. Through surface modification of the molecular sieve, the interaction between inorganic-organic interfaces is enhanced, membrane defects are reduced, the mechanical properties of the membrane material is improved, and the service life of the membrane material is prolonged. The related modified polyvinylidene fluoride membrane has the advantages of simple preparation process, easy operation, mild conditions, and easy industrialized implementation.

Description

technical field [0001] The invention belongs to the technical field of membranes, and in particular relates to a polymer membrane preparation technology with pollution-resistant function. The pollution-resistant performance and service life of the modified polyvinylidene fluoride membrane are improved. Background technique [0002] Polyvinylidene fluoride (PVDF) is a commonly used synthetic polymer membrane material with excellent mechanical properties, chemical stability, thermal stability, solvent resistance and radiation resistance. PVDF membrane has been successfully used in many fields such as chemical industry, food, medicine and biochemistry. However, due to its low surface energy and strong surface hydrophobicity, its pollution resistance in water treatment applications is poor, and the polymer porous membrane prepared by it is in the process of membrane separation, and microorganisms such as proteins in the separation medium grow The required nutrients are adsorbed...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D71/34
Inventor 纪妍妍罗文罗冬冬张彪
Owner TIANJIN POLYTECHNIC UNIV
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