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High intensity PVC hollow fiber hyperfiltration membrane and method of preparing the same

A technology of polyvinyl chloride and ultrafiltration membrane, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of low strength, easy to be fouled, low filtration speed, etc., and achieve impact resistance Improve, increase strength and service life, increase the effect of filtering speed

Inactive Publication Date: 2008-09-03
深圳市诚德来实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polyvinyl chloride also has defects. One is brittleness, and its strength and toughness are not ideal. The other is hydrophobicity. When it is used as a membrane material for filtration, it is easy to be blocked by fouling due to hydrophobicity.
There are already many manufacturers producing PVC hollow fiber ultrafiltration membranes. However, these PVC hollow fiber ultrafiltration membranes have low strength, low filtration speed, and insufficient impact force and tensile resistance. ideal, such as figure 2 The partial enlarged photo of the cross-section of the polyvinyl chloride hollow fiber membrane spun in the prior art is shown. In the photo, there are fractures and defects in the wall cavity of the finger-shaped hole in the cross-section of the membrane filament, which are factors that directly affect the strength.

Method used

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  • High intensity PVC hollow fiber hyperfiltration membrane and method of preparing the same
  • High intensity PVC hollow fiber hyperfiltration membrane and method of preparing the same

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Prepare the casting solution of the ultrafiltration membrane by the following components by weight: polyvinyl chloride (PVC) resin powder (III type) 17%, the terpolymer (MBS) of methyl methacrylate-butadiene-styrene ) resin powder 3%, polyvinyl chloride-carbonate copolymer 1%, polyethylene glycol (PEG-600) 10%, polyvinylpyrrolidone (PVP-K30) 2%, N, N-dimethylacetamide ( DMAc) 40.2%, N-methylpyrrolidone (NMP) 26.8%. Stir at a temperature of 70°C for 16 hours, stand for defoaming for 8 hours, and use a known dry-wet spinning method. The outer diameter of the spinning is 1.6mm, the inner diameter is 0.9mm, the height of the air gap is 17cm, and the inner and outer coagulation baths are both 30°C. Water, spinning speed 35m / min. After rinsing and soaking in 40% glycerin, the spun membranes were tested: the tensile breaking strength of the membranes was 7.7N, the elongation at break was 78%, the air burst pressure was 1.2MPa, the molecular weight cut-off was 80,000 Daltons, ...

Embodiment 2

[0020] Prepare the casting liquid of ultrafiltration membrane by the component of following weight ratio: polyvinyl chloride (PVC) resin powder (III type) 10%, polyvinyl chloride (PVC) resin powder (V type) 9%, methyl methacrylate Ester-butadiene-styrene terpolymer (MBS) resin powder 2.5%, polyvinyl chloride-carbonate copolymer 1.5%, polyethylene glycol (PEG-400) 6%, polyvinylpyrrolidone (PVP- K30) 5%, N,N-dimethylformamide (DMF) 44%, N-methylpyrrolidone (NMP) 22%. The spinning process is the same as in Example 1. Measured: the tensile breaking strength of the membrane filament is 8.1N, the elongation at break is 82%, the air burst pressure is 1.4MPa, the molecular weight cut off is 70,000 Daltons, and the pure water flux is 1100L / m 2 h (0.15MPa, 25°C water temperature).

[0021] Among the present invention, PVC is the theme part of film material, and PVC resin powder is general III type (average degree of polymerization 1000) and V type (average degree of polymerization 130...

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Abstract

The invention discloses a high-strength polyvinyl chloride hollow fiber ultrafiltration film which is made from a film-casting liquid containing the following components at the following weight percentages: polyvinyl chloride 13-19%, reinforcing agent 1-55, hydrophilic agent 0.4-2%, pore-forming agent 3-18% and solvent 56-79%. The reinforcing agent is a terpolymer mainly composed of methyl methacrylate, butadiene and styrene, the hydrophilic agent is a copolymer mainly composed of vinyl chloride and a carboxyl-containing compound, the pore-forming agent is the mixture of polyethylene glycol and polyvinylpyrrolidone, and the solvent is mainly N-methyl pyrrolidone. The ultrafiltration film is prepared by the following steps: (1) preparing the film-casting liquid from the components at the given ratio; (2) stirring the film-casting liquid intensively at 45-85 DEG C to debubble; and (3) extruding the film-casting liquid into a tubular hollow fiber spinning sprayer, traveling vertically 5-50 cm in the air and then going into a curing bath, followed by film forming of different phases respectively.

Description

technical field [0001] The invention relates to an ultrafiltration membrane and a preparation method thereof, in particular to a high-strength ultrafiltration membrane with polyvinyl chloride as a base material and a preparation method thereof. Background technique [0002] Membrane separation technology is an emerging technology in water treatment. Due to its good filtration effect, low energy consumption, no phase change, and easy operation, it has been more and more widely used in the fields of water purification, reclaimed water reuse, and wastewater treatment. Ultrafiltration technology is a typical type of membrane separation. Currently commonly used membrane materials include cellulose acetate (CA), polysulfone (PS), polyethersulfone (PES), polyacrylonitrile (PAN), polyvinylidene fluoride (PVDF), etc., but the cost performance of these materials is generally low , which restricts the application of the membrane to a certain extent. Therefore, it is very important to...

Claims

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Application Information

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IPC IPC(8): B01D71/30B01D69/08
Inventor 欧阳葵会夏庆余廖青云
Owner 深圳市诚德来实业有限公司
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