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POSS/PVDF composite membrane with hydrophobic surface, preparation method and application thereof

A hydrophobic surface and composite membrane technology, applied in water/sewage treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve problems such as high technical cost, difficulty in large-scale industrial application, and complicated steps. Achieve the effect of simple process, promotion of industrial application and simple equipment

Inactive Publication Date: 2021-08-27
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation of the above method is difficult for large-scale industrial application due to complicated steps, high technical cost or only small samples can be prepared.

Method used

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  • POSS/PVDF composite membrane with hydrophobic surface, preparation method and application thereof
  • POSS/PVDF composite membrane with hydrophobic surface, preparation method and application thereof
  • POSS/PVDF composite membrane with hydrophobic surface, preparation method and application thereof

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preparation example Construction

[0045] According to an embodiment of the present disclosure, a method for preparing a POSS / PVDF composite membrane with a hydrophobic surface is provided, comprising:

[0046] Alkali treatment is carried out on the polyvinylidene fluoride film by using lye to obtain the alkali-treated polyvinylidene fluoride film;

[0047] Dissolving 3-mercaptopropyltriethoxysilane in ethanol to obtain a modified solution; then, using the modified solution to modify the polyvinylidene fluoride film with alkali to obtain a modified polyvinylidene fluoride film;

[0048] Dissolving octavinyl cage silsesquioxane in dichloromethane to obtain a solution, and then adding 2-hydroxy-2-methylpropiophenone to the solution to obtain a sol;

[0049] The modified polyvinylidene fluoride film was immersed in the sol, and irradiated with ultraviolet light to obtain the POSS / PVDF composite film.

[0050] The preparation method provided by the present disclosure triggers a click reaction through ultraviolet l...

Embodiment 1

[0073] A method for preparing a POSS / PVDF composite membrane with a hydrophobic surface, comprising,

[0074] (1) Preparation of alkali-treated PVDF membrane: immerse the PVDF membrane in 2mol L -1 NaOH solution, and treated at 20°C for 2 hours, to introduce hydroxyl groups on the surface of the PVDF membrane, and obtain an alkali-treated PVDF membrane.

[0075] (2) Preparation of modified PVDF membrane: Dissolve MPTES in ethanol and stir to obtain a modified solution with a concentration of 0.1mol L -1 Then, at 20°C, immerse the alkali-treated PVDF membrane in step (1) in the modification solution, take it out after soaking for 2h, and rinse it with ethanol, and dry it at 60°C for 2h to obtain the modified polyvinylidene fluoride membrane.

[0076] (3) Preparation of sol: Add OVPOSS to DMC, stir magnetically at a speed of 100r / min for 2h, and then ultrasonically disperse at 20°C for 2h to fully dissolve OVPOSS in DMC to obtain OVPOSS / DMC with a mass fraction of 1%. solutio...

Embodiment 2

[0096] A method for preparing a POSS / PVDF composite membrane with a hydrophobic surface, comprising,

[0097] (1) Preparation of alkali-treated PVDF membrane: immerse the PVDF membrane in 3mol L -1 NaOH solution, and treated at 30°C for 4 hours, to introduce hydroxyl groups on the surface of the PVDF membrane to obtain an alkali-treated PVDF membrane.

[0098] (2) Preparation of modified PVDF membrane: Dissolve MPTES in ethanol and stir to obtain a modified solution with a concentration of 0.2mol L -l Then, at 30°C, immerse the alkali-treated PVDF membrane in step (1) in the modification solution, take it out after soaking for 4h, and rinse it with ethanol, and dry it at 70°C for 4h to obtain the modified polyvinylidene fluoride membrane.

[0099] (3) Preparation of sol: Add OVPOSS into DMC, stir magnetically at 200r / min for 4h, then ultrasonically disperse at 25°C for 4h, so that OVPOSS is fully dissolved in DMC to obtain OVPOSS / DMC with a mass fraction of 2%. solution; afte...

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Abstract

The invention provides a preparation method and application of a POSS / PVDF composite membrane with a surface. The preparation method of the POSS / PVDF composite membrane with the hydrophobic surface comprises the following steps: carrying out alkali liquor treatment on a polyvinylidene fluoride membrane by adopting alkali liquor to obtain an alkali-treated polyvinylidene fluoride membrane; dissolving 3-mercaptopropyltriethoxysilane in ethanol to obtain a modified solution; then, carrying out modification treatment on the alkali-treated polyvinylidene fluoride membrane by adopting the modification liquid, so as to obtain a modified polyvinylidene fluoride membrane; dissolving octavinyl polyhedral oligomeric silsesquioxane in dichloromethane to obtain a solution, and then adding 2-hydroxy-2-methyl propiophenone into the solution to obtain sol; and immersing the modified polyvinylidene fluoride membrane into the sol, and irradiating by adopting an ultraviolet lamp to obtain the POSS / PVDF composite membrane.

Description

technical field [0001] The disclosure relates to the technical field of membrane distillation and water treatment, and in particular to a POSS / PVDF composite membrane with a hydrophobic surface, a preparation method and an application thereof. Background technique [0002] Membrane distillation technology is a new liquid separation technology that combines traditional distillation technology with membrane separation technology. Membrane distillation is a membrane process with a phase change. Its working principle is the membrane distillation process. The water molecules of the hot side liquid evaporate and vaporize, and pass through the micropores of the hydrophobic membrane. The solutes such as non-volatile ions and molecules in the water phase cannot Through the hydrophobic membrane, the transfer of heat and mass occurs at the same time, so as to achieve the purpose of solution separation, concentration or purification. [0003] Compared with conventional distillation, ul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D69/02B01D71/34B01D67/00B01D61/36C02F1/44C08J7/18C08J7/12
CPCB01D69/125B01D69/02B01D71/34B01D67/0093B01D61/364C02F1/447C08J7/18C08J7/12B01D2325/38C08J2327/16
Inventor 侯得印王军王凯张勇曹爱新
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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