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Nanometer cross-linking PVDF/PU blending hollow fiber ultrafiltration membrane and preparation method

An ultrafiltration membrane and nanotechnology, applied in the field of membrane separation, can solve the problems of difficult molecular-level mixing, low membrane strength, large pore size, etc., to achieve strong toughness and hydrophilicity, no decrease in retention rate, and increase in water flux. Effect

Inactive Publication Date: 2011-08-17
何善媛
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the single-component PVDF hollow fiber ultrafiltration membrane has the following problems during use: (1) PVDF ultrafiltration membrane has poor hydrophilicity and is easy to pollute; (2) The water flux and rejection rate of the membrane cannot be increased at the same time; (3) ) The mechanical strength of the film is not high, so it is easy to break the wire during use
However, due to the difference in structure between PVDF and PU, it is difficult to achieve molecular-level mixing, and even the compatibility is not good, and the prepared membrane has low strength and large pore size.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] According to the following components and proportions: copolymerization mixture PVDF 10%, PU 10%; pore forming agent: ethylene glycol methyl ether 6.0%, lithium chloride 3%; solvent: dimethylacetamide (DMAC) 68%; Nano crosslinking agent: Nano TiO 2 Sol 3%. Put the above raw materials into the reaction kettle, heat and stir at 70°C for 5 hours, dissolve evenly, and defoam under vacuum for 4 hours to obtain a standard casting solution; the casting solution is extruded through the spinning nozzle under the pressure of 0.35Mpa, After staying for 2-3s, enter the pure water coagulation bath at 25°C, take it out after soaking for 48 hours, rinse with clean water, then use 30% glycerol for surface treatment, soak for 12-24 hours, and dry to obtain nano-crosslinking PVDF / PU blend hollow fiber ultrafiltration membrane. At room temperature, the breaking strength of the film was measured using a tensile strength tester. The strength of the film was measured to be 20 MPa, and the...

Embodiment 2

[0024] According to the following components and proportions: copolymerization mixture PVDF 8%, PU 15%; pore forming agent: polyethylene glycol (PEG) 7%; solvent: dimethylformamide (DMF) 65%; nano crosslinking agent : Nano SiO 2 Sol 5%. Put the above raw materials into the reaction kettle, heat and stir at 50°C for 10 hours, dissolve evenly, and defoam under vacuum for 4 hours to obtain the casting solution; the casting solution is extruded through the spinning nozzle under the pressure of 0.3Mpa, and stays in the air After 2-3s, enter the pure water coagulation bath at 25°C, take it out after soaking for 48 hours, rinse with clean water, then use 30% glycerol for surface treatment, soak for 12-24 hours, and dry to obtain nano-crosslinked PVDF / PU blended hollow fiber ultrafiltration membrane. At room temperature, the breaking strength of the film was measured using a tensile strength tester. The strength of the measured film is 22Mpa, and the stretching ratio is 8 times. ...

Embodiment 3

[0026] According to the following components and proportions: copolymerization mixture PVDF 15%, PU 5%; pore forming agent: polyvinylpyrrolidone (PVP) 6%; solvent: N, N-dimethylpyrrolidone NMP 73%; Joint agent: nano Al 2 o 3 Sol 1%. Put the above raw materials into the reaction kettle, heat and stir at 90°C for 3 hours, dissolve evenly, and defoam under vacuum for 5 hours to obtain the casting solution; the casting solution is extruded through the spinning nozzle under the pressure of 0.35Mpa, and stays in the air After 2-3s, enter the pure water coagulation bath at 25°C, take it out after soaking for 48 hours, rinse with clean water, then use 30% glycerol for surface treatment, soak for 12-24 hours, and dry to obtain nano-crosslinked PVDF / PU blended hollow fiber ultrafiltration membrane. At room temperature, the breaking strength of the film was measured using a tensile strength tester. The strength of the film was measured to be 18 MPa, and the stretching ratio was 5 ti...

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Abstract

The invention discloses a nanometer cross-linking PVDF / PU (Polyvinylidene Fluoride / Polyurethane) blending hollow fiber ultrafiltration membrane and a preparation method thereof, wherein the nanometer cross-linking PVDF / PU blending hollow fiber ultrafiltration membrane mainly contains the ingredients of polyvinylidene fluoride (PVDF), polyurethane (PU), nanometer cross-linking agent and solvent, and the nanometer cross-linking PVDF / PU blending hollow fiber ultrafiltration membrane prepared according to the method of the invention integrates the characteristics of two high polymers and nanometer material, and has the advantages of large strength, good tenacity and thermal resistance, excellent pollution resistance, large flux and the like.

Description

technical field [0001] The invention relates to the technical field of membrane separation, in particular to a nano-crosslinked PVDF / PU blended hollow fiber ultrafiltration membrane and a preparation method thereof. Background technique [0002] Polyvinylidene fluoride (PVDF) is a crystalline polymer with good mechanical strength, outstanding anti-ultraviolet and weathering resistance characteristics, and it also has excellent chemical stability. It is a relatively good membrane material at present. . However, the single-component PVDF hollow fiber ultrafiltration membrane has the following problems during use: (1) PVDF ultrafiltration membrane has poor hydrophilicity and is easy to pollute; (2) The water flux and rejection rate of the membrane cannot be increased at the same time; (3) ) The mechanical strength of the film is not high, so it is easy to break the wire during use. [0003] Polyurethane (PU) (thermoplastic polyurethane elastomer) has the elasticity of r...

Claims

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Application Information

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IPC IPC(8): B01D71/54B01D71/34B01D69/08
Inventor 何善媛
Owner 何善媛
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