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Method for preparing polyvinylidene fluoride-phenolphthalein polyethersulfone blending membrane

A technology of phenolphthalein-based polyethersulfone and polyvinylidene fluoride, which is applied in the field of preparation of polyvinylidene fluoride membranes, can solve problems such as inability to solve shrinkage resistance and hydrophobicity, limit the application of PVDF membranes, and expensive diphenyl carbonate, etc. , achieve good application prospects, improve shrinkage resistance and high strength

Inactive Publication Date: 2011-01-26
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Diphenyl carbonate is expensive, the production cost increases, and the operating temperature is high, and the polymer is easy to degrade
Chinese patent CN 101590374A prepared pure PVDF membrane by adding inorganic particles, diluent and some good solvents by twin-screw method, and Chinese patent CH101053778A prepared PVDF membrane by adding polyethylene oxide and inorganic particles, but still could not solve the shrinkage resistance of the membrane and hydrophobicity issues
The above methods all limit the application of PVDF membrane in sewage treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Blend polyvinylidene fluoride with an intrinsic viscosity of 1.67, phenolphthalein-based polyethersulfone with a molecular weight of 50,000, lithium chloride, dibutyl phthalate and dimethylacetamide, and its mass fraction is composed of polyvinylidene fluoride Ethylene 21.6%, phenolphthalein polyethersulfone 2.4%, lithium chloride 1%, dibutyl phthalate 55%, dimethylacetamide 20%. The mixture was heated to 130°C, stirred for 1 hour, and then allowed to stand at 130°C for 2 hours. The blended solution was directly scraped on the support material to form a flat film, the thickness of which was controlled to 200 microns, and the film was solidified by immersing in a water bath at 30°C. The cured film was first immersed in ethanol for extraction for 12 hours, then immersed in distilled water for 12 hours, then immersed in 50% ethylene glycol aqueous solution for 6 hours, and finally dried at 60°C.

[0026] The compressive strength of the membrane is greater than 5MPa, and t...

Embodiment 2

[0028] Blend polyvinylidene fluoride with an intrinsic viscosity of 1.67, phenolphthalein-based polyethersulfone with a molecular weight of 50,000, lithium chloride, dibutyl phthalate and dimethylacetamide, and its mass fraction is composed of polyvinylidene fluoride Ethylene 21.6%, phenolphthalein polyethersulfone 2.4%, lithium chloride 1%, dibutyl phthalate 65%, dimethylacetamide 10%. The mixture was heated to 130°C, stirred for 1 hour, and then allowed to stand at 130°C for 2 hours. The blended solution was passed through a hollow spinneret to make a hollow fiber membrane with a membrane thickness of 280 microns. The cured film was first immersed in ethanol for extraction for 12 hours, then immersed in distilled water for 12 hours, then immersed in 50% ethylene glycol aqueous solution for 6 hours, and finally dried at 60°C.

[0029] The compressive strength of the hollow fiber membrane is greater than 5MPa, and the pure water flux at 0.1MPa is 1184L / (m 2 .h).

Embodiment 3

[0031] Blend polyvinylidene fluoride with an intrinsic viscosity of 1.67, phenolphthalein-based polyethersulfone with a molecular weight of 50,000, polyvinylpyrrolidone, dibutyl phthalate and dimethylacetamide, and its mass fraction is composed of polyvinylidene fluoride Ethylene 18%, phenolphthalein polyethersulfone 2%, polyvinylpyrrolidone 5%, dibutyl phthalate 65%, dimethylacetamide 10%. The mixture was heated to 130°C, stirred for 1 hour, and then allowed to stand at 130°C for 2 hours. The blended solution was directly scraped on the support material to form a flat film, the thickness of which was controlled to 200 microns, and the film was solidified by immersing in a water bath at 30°C. The cured film was first immersed in ethanol for extraction for 12 hours, then immersed in distilled water for 12 hours, then immersed in 50% ethylene glycol aqueous solution for 6 hours, and finally dried at 60°C.

[0032] The compressive strength of the membrane is greater than 5MPa, a...

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Abstract

The invention relates to a method for preparing a polyvinylidene fluoride-phenolphthalein polyethersulfone blending membrane, which comprises the following steps of: (1) blending polyvinylidene fluoride, phenolphthalein polyethersulfone, a diluent, a good solvent and an inorganic additive or organic additive; (2) placing the mixture into a high-temperature stirred tank, raising the temperature to 120 to 145 DEG C, performing stirring to form polymer solution and performing standing and defoaming; (3) forming a membrane; and (4) extracting, impregnating and drying the obtained membrane to form the polyvinylidene fluoride-phenolphthalein polyethersulfone blending membrane. The method has the advantages of preparing the membrane at relatively lower temperature, reducing the degradation of polymers and ensuring the relatively stronger strength of the membrane, along with low cost; and the prepared polyvinylidene fluoride blending membrane can achieve effective improvements in hydrophilicity and resistance to shrinkage, and has vast application prospect.

Description

technical field [0001] The invention belongs to the field of preparation of polyvinylidene fluoride membranes, in particular to a method for preparing polyvinylidene fluoride and phenolphthalein-based polyethersulfone blend membranes. Background technique [0002] Membrane separation technology has the advantages of simple process, good economy, often no phase change, large separation coefficient, energy saving and high efficiency, no secondary pollution, continuous operation at room temperature, direct amplification, and dedicated membrane matching. And the membrane process is especially suitable for the treatment of heat-sensitive substances, and has its unique applicability in the fields of food processing, medicine, and biochemical technology. In recent years, with people's increasing attention to environmental issues, especially higher requirements for urban and industrial sewage treatment, domestic sewage treatment is currently shifting from traditional biological trea...

Claims

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Application Information

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IPC IPC(8): B01D71/68B01D69/12B01D67/00
Inventor 武利顺薛罡陈泉源
Owner DONGHUA UNIV