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Pervaporation membrane with specific function and preparation method and application thereof

A pervaporation membrane and a technology with specific functions, which is applied in the field of pervaporation membrane and its preparation, can solve the problems that the hydrophobicity is difficult to meet the efficient recovery of organic matter in the pervaporation membrane, increase the difficulty of operation, and microbial adhesion, etc., to achieve enhanced anti-biological pollution performance, Improvement of reactivity, hydrophobicity and anti-fouling effect

Active Publication Date: 2021-06-18
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the traditional polymer membrane preparation process, it is unavoidable to use organic solvents to dissolve polymers. Solvent volatilization will increase the difficulty of actual operation and cause environmental pollution; Meet the requirements of pervaporation membrane for efficient recovery of organic matter, and high membrane surface free energy is easy to cause microbial adhesion (membrane fouling)

Method used

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  • Pervaporation membrane with specific function and preparation method and application thereof
  • Pervaporation membrane with specific function and preparation method and application thereof
  • Pervaporation membrane with specific function and preparation method and application thereof

Examples

Experimental program
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Embodiment approach

[0054] As mentioned above, in the traditional polymer film preparation process, it is inevitable to use organic solvents to dissolve polymers, and solvent volatilization will increase the difficulty of actual operation and cause environmental pollution; at the same time, traditional polymer films due to their own material properties Limitations, hydrophobicity is difficult to meet the requirements of pervaporation membrane for efficient recovery of organic matter, and high membrane surface free energy is easy to cause microbial adhesion (membrane fouling).

[0055] In view of this, the inventors have conducted a lot of research on hydrophobic pervaporation membranes. The inventors have found that using fluorine-containing small molecules as light-responsive diluting monomers to replace traditional organic solvents can (1) reduce the membrane liquid The viscosity of the polymer chain can alleviate the excessive packing of the polymer chain, increase the collision rate between mo...

Embodiment 1

[0106] (1) Preparation of photoresponsive polydimethylsiloxane: 11g of hydroxyl-terminated polydimethylsiloxane (hydroxyl-terminated polydimethylsiloxane, molecular weight 50,000), 2g of modifier γ-methicone Acryloxypropyl trimethoxysilane (equivalent to 18wt% of polysiloxane), 0.2g catalyst dibutyltin dilaurate mixed (equivalent to 1.8wt% of polysiloxane), stirred by 600rpm mechanical Mix well; degassing to obtain polydimethylsiloxane with photoresponsiveness.

[0107] (2) Preparation of casting solution: Take 5g of the above photoresponsive polydimethylsiloxane, add 2g of dodecafluoroheptyl methacrylate (photoresponsive polysiloxane and photoresponsive diluent monomer) The mass ratio is 2.5:1) and 1wt% photoinitiator 2-hydroxyl-2-methylpropiophenone (1wt% equivalent to photoresponsive diluting monomer and photoresponsive polysiloxane total amount), 1000rpm mechanical stirring is sufficient Mix to obtain casting solution.

[0108] (3) Scratch film: after defoaming the above...

Embodiment 2

[0112] (1) Preparation of photoresponsive polydimethylsiloxane: 5g hydroxyl-terminated polydimethylsiloxane (molecular weight 20000), 1g modifier 3-methacryloxypropylmethyl dimethicone Methoxysilane (equivalent to 20wt% of polysiloxane), 0.1g catalyst dibutyltin dilaurate mixed (equivalent to 2wt% of polysiloxane), fully mixed by 600rpm mechanical stirring; Responsive polydimethylsiloxane.

[0113] (2) Preparation of casting solution: take 5g of the above-mentioned photoresponsive polydimethylsiloxane, add 5g of dodecafluorohexyl methacrylate (the mass of photoresponsive polysiloxane and photoresponsive diluent monomer The ratio is 1:1) and 3wt% photoinitiator diphenyl-(2,4,6-trimethylbenzoyl) oxyphosphine (equivalent to the total amount of photoresponsive diluent monomer and photoresponsive polysiloxane 3wt%), fully mixed with 1000rpm mechanical stirring, to obtain the casting solution.

[0114] (3) Scratch film: after defoaming the above-mentioned casting solution, apply f...

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Abstract

The invention relates to a pervaporation membrane material with a specific function. The pervaporation membrane material is prepared by polymerizing light response type polysiloxane and a light response type diluting monomer in the presence of a photoinitiator. The pervaporation membrane material contains a light response type polysiloxane unit and a light response type diluting monomer unit, wherein the photoresponse type diluting monomer has a photoinitiation group and a fluoroalkyl chain at the same time, so that the prepared fluorine-containing pervaporation membrane has a better hydrophobic effect than an original PDMS membrane, and meanwhile, the fluorine-containing pervaporation membrane can reduce free energy on the surface of the membrane, so that the biological pollution resistance of the membrane is enhanced (microbial adhesion is reduced). The separation performance and the long-term stability of the membrane are improved due to extremely high hydrophobicity and pollution resistance.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a pervaporation membrane with specific functions, a preparation method and application thereof. Background technique [0002] In the traditional polymer membrane preparation process, it is unavoidable to use organic solvents to dissolve polymers. Solvent volatilization will increase the difficulty of actual operation and cause environmental pollution; It meets the requirements of the pervaporation membrane for the efficient recovery of organic matter, and the high membrane surface free energy is easy to cause microbial adhesion (membrane fouling). [0003] Therefore, the current problem is to research and develop a high-efficiency pervaporation membrane with specific functions such as anti-biological fouling and its preparation technology. Contents of the invention [0004] The technical problem to be solved by the present invention is to provide a perv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/12C08F220/22C08F2/48C08J5/18B01D61/36B01D67/00B01D71/70C08L51/08
CPCC08F283/124C08F2/48C08J5/18B01D61/362B01D67/0006B01D71/70C08J2351/08C08F220/22
Inventor 秦培勇司志豪李国桢王雅琪刘畅李树峰曹辉谭天伟
Owner BEIJING UNIV OF CHEM TECH
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