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Water-soluble metallic organic molecular cage-based polydimethylsiloxane composite membrane and preparation method thereof

A polydimethylsiloxane and metal-organic molecule technology is applied in the field of polydimethylsiloxane composite membrane and its preparation, which can solve the problems of restricting the application in the field of VOCs removal, agglomeration of inorganic nanoparticles, poor dispersibility and the like , to achieve the effect of improving the inter-chain spacing, high separation factor, and uniform distribution

Inactive Publication Date: 2017-02-15
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are problems such as agglomeration, interface defects and poor dispersion of inorganic nanoparticles in PDMS membranes, which greatly restrict their application in the field of VOCs removal.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Preparation of film-making pre-emulsion:

[0019] After uniformly mixing 72.5 parts of hydroxyl-terminated polydimethylsiloxane (molecular weight 78000), 1 part of water-soluble metal molecular cage, 1 part of surfactant, and 15 parts of water at 25°C, a film-forming pre-emulsion was formed.

[0020] (2) Thermal crosslinking to form a filled polymer composite film:

[0021] Add 10 parts of cross-linking agent tetraethoxysilane to the above film-making pre-emulsion, and stir 0.5 parts of catalyst di-n-butyltin dilaurate at 25°C for 20 minutes, vacuum defoam the stirred film-making material and apply it on The surface of the polyvinylidene fluoride ultrafiltration membrane was cured in an oven at 60°C for 24 hours until the crosslinking was complete, and the polydimethylsiloxane / water-soluble molecular cage composite membrane with a thickness of about 50 μm was obtained.

[0022] Above-mentioned membrane is put into permeation cell, and in feed gas n-hexane mole frac...

Embodiment 2

[0028] (1) Preparation of film-making pre-emulsion:

[0029] After uniformly mixing 70.5 parts of hydroxyl-terminated polydimethylsiloxane (molecular weight 78000), 3 parts of water-soluble metal molecular cage, 1 part of surfactant and 15 parts of water at 25°C, a film-forming pre-emulsion was formed.

[0030] (2) Thermal crosslinking to form a filled polymer composite film:

[0031] Add 10 parts of cross-linking agent tetraethoxysilane to the above film-making pre-emulsion, and stir 0.5 parts of catalyst di-n-butyltin dilaurate at 25°C for 20 minutes, vacuum defoam the stirred film-making material and apply it on The surface of the polyvinylidene fluoride ultrafiltration membrane was cured in an oven at 60°C for 24 hours until the crosslinking was complete, and the polydimethylsiloxane / water-soluble molecular cage composite membrane with a thickness of about 50 μm was obtained.

[0032] The permeability coefficient of the measured membrane is: P 正己烷 =1.633×10 -5 mol μm / m ...

Embodiment 3

[0034] (1) Preparation of film-making pre-emulsion:

[0035] After uniformly mixing 68.5 parts of hydroxyl-terminated polydimethylsiloxane (molecular weight 78000), 5 parts of water-soluble metal molecular cage, 1 part of surfactant and 15 parts of water at 25°C, a film-forming pre-emulsion was formed.

[0036] (2) Thermal crosslinking to form a filled polymer composite film:

[0037] Add 10 parts of cross-linking agent tetraethoxysilane to the above-mentioned film-forming pre-emulsion, and stir 0.5 parts of catalyst di-n-butyltin dilaurate for 20 minutes at 25°C, vacuum defoam the stirred film-making material and apply it on The surface of the polyvinylidene fluoride ultrafiltration membrane was cured in an oven at 60°C for 24 hours until the crosslinking was complete, and a polydimethylsiloxane / water-soluble molecular cage composite membrane with a thickness of about 50 μm was obtained.

[0038] The permeability coefficient of the measured membrane is: P 正己烷 =2.342×10 -5 ...

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Abstract

The invention relates to a water-soluble metallic organic molecular cage-based polydimethylsiloxane composite membrane and a preparation method thereof, and belongs to the field of membrane separation techniques and high and new techniques. The preparation method of the membrane comprises the following technological steps: (1), the preparation of a membrane-making pre-emulsion: uniformly mixing polydimethylsiloxane, metallic organic molecular cages, a surfactant and water at 25 DEG C, so as to subsequently form the membrane-making pre-emulsion; (2), the formation of filled polymer composite membrane in a thermal cross-linking manner: adding a cross-linking agent and a catalyst into membrane-making material liquid, agitating an obtained mixture at 25 DEG C, defoaming the agitated membrane-making material liquid in a vacuum manner, then coating a polyvinylidene fluoride ultrafiltration membrane with the defoamed membrane-making material liquid, putting the polyvinylidene fluoride ultrafiltration membrane in a baking oven to cure the defoamed membrane-making material liquid until the cross linking is complete. As the water-soluble metallic organic molecular cages are uniformly distributed in the membrane, the composite membrane prepared by adopting the method provided by the invention is good in penetrating quality to organic vapor, and is high in the separation factor to organic vapor / nitrogen by hydrophobic inner cavities and the regulation and the control on spaces among chains of the membrane of the water-soluble metallic organic molecular cages.

Description

technical field [0001] The invention relates to a polydimethylsiloxane composite membrane based on a water-soluble metal organic molecular cage and a preparation method thereof, belonging to the technical field of membrane separation. Background technique [0002] Volatile organic compounds (Volatile Organic Compounds, VOCs) are ubiquitous and complex organic pollutants in the air, causing great harm to the environment, the growth of animals and plants, and human health. Carrying out research on high-efficiency VOCs removal technology will have extremely important theoretical significance and application value for solving the increasingly serious regional air pollution, maintaining human health, and improving resource utilization. VOCs removal technology first requires high efficiency and low energy consumption, followed by simple process and easy operation and maintenance. At present, the treatment methods of VOCs mainly include incineration, photocatalytic oxidation, abso...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D71/70B01D67/00B01D53/22
CPCB01D69/125B01D53/228B01D67/0002B01D71/34B01D71/70B01D2256/10B01D2257/708B01D2325/10B01D2325/36B01D2325/38
Inventor 张春芳吴国梁白云翔
Owner JIANGNAN UNIV
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