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Polydimethylsiloxane/silicon dioxide hybrid membrane and preparation method thereof

A polydimethylsiloxane and silica technology, which is applied in the field of polydimethylsiloxane/silica hybrid membrane and preparation, achieves the effects of mild conditions, controllable microstructure and good separation performance

Inactive Publication Date: 2012-05-23
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These three methods have varying degrees of limitations in solving inorganic particle agglomeration and interface structure morphology optimization.

Method used

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  • Polydimethylsiloxane/silicon dioxide hybrid membrane and preparation method thereof
  • Polydimethylsiloxane/silicon dioxide hybrid membrane and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0016] Polydimethylsiloxane (PDMS) with a viscosity of 5,000 was dissolved in n-heptane to prepare n-heptane solutions with PDMS mass concentrations of 20 wt%. Dissolve Tween 80 / Span 80 compound surfactant (mass ratio 1:1) and tetraethyl orthosilicate (TEOS) in the above-mentioned n-heptane solution at room temperature according to a certain ratio. Wherein the TEOS content is 35wt% of the PDMS mass. Prepare a Tris-HCl buffer solution with a concentration of 30mM, adjust the pH value to 7.0, and then add protamine sulfate to prepare an aqueous solution with a mass concentration of protamine sulfate (protamine sulfate) of 10mg / ml. The above protamine aqueous solution was added dropwise to the previously prepared n-heptane solution under the condition of strong mechanical stirring, the mass fraction of the protamine aqueous solution in the final mixed solution was 1.4wt%, and the protamine aqueous solution and The mass ratio of the surfactant is 0.45. Add a few drops of dibutyl...

Embodiment 2

[0018] Polydimethylsiloxane (PDMS) with a viscosity of 5,000 was dissolved in n-heptane to prepare n-heptane solutions with PDMS mass concentrations of 20 wt%. Dissolve Tween 80 / Span 80 compound surfactant (mass ratio 1:1) and tetraethyl orthosilicate (TEOS) in the above-mentioned n-heptane solution at room temperature according to a certain ratio. Wherein the TEOS content is 45wt% of the PDMS mass. A Tris-HCl buffer solution with a concentration of 30 mM was prepared, the pH value was adjusted to 7.0, and then protamine sulfate was added to prepare an aqueous solution with a mass concentration of protamine sulfate of 10 mg / ml. The above protamine aqueous solution was added dropwise to the previously prepared n-heptane solution under the condition of strong mechanical stirring, the mass fraction of the protamine aqueous solution in the final mixed solution was 1.9wt%, and the protamine aqueous solution and The mass ratio of the surfactant is 0.45. Add a few drops of dibutylt...

Embodiment 3

[0020] Polydimethylsiloxane (PDMS) with a viscosity of 5,000 was dissolved in n-heptane to prepare n-heptane solutions with PDMS mass concentrations of 20 wt%. Dissolve Tween 80 / Span 80 compound surfactant (mass ratio 1:1) and tetraethyl orthosilicate (TEOS) in the above-mentioned n-heptane solution at room temperature according to a certain ratio. Wherein the TEOS content is 60wt% of the PDMS mass. A Tris-HCl buffer solution with a concentration of 30 mM was prepared, the pH value was adjusted to 7.0, and then protamine sulfate was added to prepare an aqueous solution with a mass concentration of protamine sulfate of 10 mg / ml. The above-mentioned protamine aqueous solution is added dropwise in the previously prepared n-heptane solution under the condition of strong mechanical stirring, the mass fraction of the protamine aqueous solution in the final mixed solution is 2.4wt%, the protamine aqueous solution and the surface The mass ratio of the active agent is 0.45. Add a few...

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Abstract

The invention relates to a polydimethylsiloxane (PDMS) / silicon dioxide hybrid membrane and a preparation method thereof. The preparation method comprises the following steps: dissolving PDMS into organic alkane to obtain a homogeneous solution; dissolving a surfactant and an organosilane precursor into the organic alkane solution according to a certain proportion at room temperature; preparing a certain concentration of Tris-HCI buffer solution (pH value is 7.0), and adding protamine sulfate to obtain a protamine sulfate aqueous solution; dropwise adding the protamine sulfate aqueous solutionto the previously prepared organic alkane solution under the condition of strong mechanical agitation, and fully stirring; and adding a few drops of an organotin catalyst to the obtained solution, fully stirring, standing and defoaming to obtain a casting solution, casting the casting solution on a polysulfone ultrafiltration membrane, drying and treating to obtain the PDMS / silicon dioxide hybridmembrane. The hybrid membrane is used for simulating FCC gasoline desulfurization, the enrichment coefficient thereof on thiophene is 4.8-5.8 and the permeation flux is 6.61-10.76kg / (m<2>h). The invention has the advantages of simple preparation process, mild conditions and rich and controllable raw materials.

Description

technical field [0001] The invention relates to a polydimethylsiloxane / silicon dioxide hybrid film and a preparation method. technical background [0002] In recent years, polymer-inorganic hybrid membrane materials have attracted widespread interest from academia and industry. According to the preparation method, the preparation methods of hybrid membrane materials can be roughly divided into three types: the first is to directly fill the inorganic particles into the polymer matrix to make the hybrid membrane material; the second is to mix the inorganic components in the polymer matrix In situ growth to prepare hybrid membrane materials; the third is to couple polymers and inorganic precursors first and then make hybrid membrane materials, that is, intramolecular hybridization. These three methods have varying degrees of limitations in solving inorganic particle agglomeration and interface structure morphology optimization. Inspired by the synthesis of inorganic nanomater...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L83/04C08K3/36C08J5/18C01B33/113C10G31/09
Inventor 姜忠义李犇吴洪刘万鹏曹锐建
Owner TIANJIN UNIV
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