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Preparation method of nanoparticle-modified silicone rubber composite film

A nanoparticle and composite membrane technology, applied in the fields of recycling and organic vapor separation, can solve the problems of limited application, electrostatic sparks, insufficient tensile strength of silicone rubber membrane components, etc., to reduce swelling effect, prolong service life, The effect of improving the aging resistance

Active Publication Date: 2017-05-31
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The use of membrane modules for the separation and recovery of organic vapors has the advantages of high efficiency and low energy consumption. However, there are obvious shortcomings in the application of membrane modules in the field of separation and recovery of organic vapors: on the one hand, the tensile strength of silicone rubber membrane modules Not enough, which limits its further application in different fields; on the other hand, when the gas flows on the surface of the membrane, it will generate static electricity. When the static electricity accumulates to a certain extent, static sparks may appear
[0007] However, the use of semiconductor nanoparticles to modify silicone rubber membranes, especially to improve the electrostatic shielding effect of the membrane, is rarely involved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The preparation material of the active separation layer of the composite membrane is composed of: polydimethylsiloxane (PDMS) (RTV107 brand), ethyl orthosilicate, dibutyl tin dilaurate, and the mass ratio of nano-graphite powder is 100:10 :1:16.

[0048] The particle size of nano graphite powder is 55nm.

[0049] Dissolve polydimethylsiloxane in n-heptane, add nanoparticles and ethyl orthosilicate under mechanical stirring at 150 rpm, then add catalyst dibutyltin dilaurate, continue mechanical stirring for 10 minutes, use The power is 6W / cm 2 , with a frequency of 1×10 6 Hz ultrasonic instrument ultrasonically disperses for 10 minutes to carry out preliminary dispersion of the casting solution system.

[0050] Finally, at a power of 0.14W / cm 2 , with a frequency of 3×10 4 React for 5 hours under stirring with a Hz ultrasonic instrument, and then leave to stand for vacuum defoaming to prepare a casting solution.

[0051] The configured casting solution was cast on ...

Embodiment 2

[0072] The preparation material of the active separation layer of the composite membrane consists of: polydimethylsiloxane (PDMS) (RTV107 brand), ethyl orthosilicate, dibutyl tin dilaurate, and the mass ratio of conductive carbon black particles is 100: 15:1.5:22.

[0073] The particle size of conductive carbon black particles is 45nm.

[0074] Dissolve polydimethylsiloxane in n-heptane, then add nanoparticles and ethyl orthosilicate, add the catalyst dibutyltin dilaurate under mechanical stirring at 300 rpm, continue mechanical stirring for 10 minutes, use The power is 900W and the frequency is 3.6×10 4 Hz sonicator ultrasonically stirred for 10 minutes.

[0075] Finally, the power is 400W, the frequency is 3×10 4 React for 5 hours under stirring with a Hz ultrasonic instrument, and then leave to stand for vacuum defoaming to prepare a casting solution.

[0076] The configured casting solution was cast on a polyacrylonitrile (PAN) porous base membrane, and cured at 55° C....

Embodiment 3

[0082] The preparation materials for the active separation layer of the composite membrane are composed of: polydimethylsiloxane (PDMS) (RTV107 grade), ethyl orthosilicate, dibutyltin dilaurate, nano RuO 2 The particle mass ratio is 100:15:1.5:31.

[0083] Nano-RuO 2 The particle size is 40nm.

[0084] Dissolve polydimethylsiloxane in n-heptane, then add nanoparticles and ethyl orthosilicate, add catalyst dibutyltin dilaurate under mechanical stirring at 700 rpm, continue mechanical stirring for 10 minutes, use The power is 900W, the frequency is 8×10 8 Hz sonicator ultrasonically stirred for 10 minutes.

[0085] Finally, the power is 400W, the frequency is 3×10 8 React for 5 hours under stirring with a Hz ultrasonic instrument, and then leave to stand for vacuum defoaming to prepare a casting solution.

[0086] The configured casting solution was cast on a polyacrylonitrile (PAN) porous base membrane, and cured at 55° C. for 65 hours.

[0087] The permeability and separ...

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Abstract

The invention discloses a preparation method of a nanoparticle-modified silicone rubber composite film. The preparation method comprises the following steps: adding polydimethylsiloxane, nanoparticles, a cross-linking agent and a catalyst into an organic solvent, and obtaining a suspension by stirring and mixing at a high rotating speed; performing ultrasonic dispersion on the suspension by adopting a high-power density and high-frequency ultrasonic instrument for a period of time; finally reacting under the condition of ultrasonic dispersion by adopting a low-power density and low-frequency ultrasonic instrument to obtain a film casting solution; pouring the film casting solution on a porous base film, scraping, drying under vacuum after the completion of cross-linking reaction and removing the solvent to obtain the nanoparticle-modified silicone rubber composite film. The preparation method disclosed by the invention has the benefits that a silicone rubber active separation layer of the composite film is modified by nanoparticles, the nanoparticle-modified silicone rubber composite film has anti-static performance, and the safety of the silicone rubber composite film in the field of oil and gas separation and recovery is significantly improved.

Description

technical field [0001] The invention relates to the preparation and composition of a composite membrane with antistatic function, in particular to the silicon rubber active separation layer of the modified composite membrane filled with particles, which is applied to the field of separation and recovery of organic vapor. Background technique [0002] The composite membrane with silicone rubber as the active separation layer is widely used in the field of separation and recovery of organic vapor. For example: in the polyolefin preparation process, the mixed gas containing olefin and nitrogen purged from the degassing chamber is directly discharged to the flare before being recovered by the membrane device, resulting in waste. Membrane devices are used to process purge gas, the recovery rate of olefins has reached 90%, and nitrogen can be reused, which has achieved good results; in oil storage facilities such as oil depots and gas stations, membrane modules are used to recover...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/70B01D69/12B01D67/00
CPCB01D67/0079B01D69/125B01D71/70
Inventor 齐先志赵巍王晓霖李明
Owner CHINA PETROLEUM & CHEM CORP
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