Preparation method of PTFE/SiO2/Al2O3 porous membrane coated on surface of porous aluminum

A technology of surface coating and PTFE, which is used in devices for coating liquids on surfaces, special surfaces, pre-treated surfaces, etc., can solve the problems of reducing the friction between sound waves and porous aluminum, reducing sound absorption performance, etc. The effect of sound function application, high preparation efficiency and high sound absorption characteristics

Active Publication Date: 2019-02-15
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the smooth surface of the PTFE membrane will reduce the friction between

Method used

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  • Preparation method of PTFE/SiO2/Al2O3 porous membrane coated on surface of porous aluminum
  • Preparation method of PTFE/SiO2/Al2O3 porous membrane coated on surface of porous aluminum
  • Preparation method of PTFE/SiO2/Al2O3 porous membrane coated on surface of porous aluminum

Examples

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[0033] Example 1

[0034] A porous aluminum surface coated with PTFE / SiO 2 / Al 2 O 3 The preparation method of the porous membrane, the specific steps are as follows:

[0035] (1) PTFE / SiO 2 / Al 2 O 3 Preparation of homogeneous liquid

[0036] Combine PTFE emulsion, KH-560 modified silica sol and Al with a particle size of 1~3μm 2 O 3 Particle mixing, where the volume ratio of PTFE emulsion and KH-560 modified silica sol is 1:0.5, Al 2 O 3 The volume fraction of particles is 40% of the total volume of PTFE emulsion and KH-560 modified silica sol. The PTFE emulsion, KH-560 modified silica sol and Al 2 O 3 The mixture of particles is magnetically stirred for 5 hours to obtain PTFE / SiO 2 / Al 2 O 3 Homogeneous mixture.

[0037] (2) The surface of porous aluminum is roughened

[0038] The porous aluminum with a porosity of 60%, a pore diameter of 0.1mm, and a through-hole structure is etched for 60s in a 0.8mol / L NaOH solution. The corroded porous aluminum is washed with deionized water and ...

Example Embodiment

[0045] Example 2

[0046] A porous aluminum surface coated with PTFE / SiO 2 / Al 2 O 3 The preparation method of the porous membrane, the specific steps are as follows:

[0047] (1) PTFE / SiO 2 / Al 2 O 3 Preparation of homogeneous liquid

[0048] Combine PTFE emulsion, KH-560 modified silica sol and Al with a particle size of 3~5μm 2 O 3 Particle mixing, where the volume ratio of PTFE emulsion and KH-560 modified silica sol is 1:0.55, Al 2 O 3 The volume fraction of particles is 31% of the total volume of PTFE emulsion and KH-560 modified silica sol. The PTFE emulsion, KH-560 modified silica sol and Al 2 O 3 The mixture of particles is magnetically stirred for 4.5h to obtain PTFE / SiO 2 / Al 2 O 3 Homogeneous mixture.

[0049] (2) The surface of porous aluminum is roughened

[0050] Porous aluminum with a porosity of 70%, a pore diameter of 1 mm, and a through-hole structure was etched for 90s in a 0.9mol / L NaOH solution. The corroded porous aluminum was washed with deionized water shaking a...

Example Embodiment

[0057] Example 3

[0058] A porous aluminum surface coated with PTFE / SiO 2 / Al 2 O 3 The preparation method of the porous membrane, the specific steps are as follows:

[0059] (1) PTFE / SiO 2 / Al 2 O 3 Preparation of homogeneous liquid

[0060] Combine PTFE emulsion, KH-560 modified silica sol and Al with a particle size of 5-8μm 2 O 3 Particle mixing, where the volume ratio of PTFE emulsion and KH-560 modified silica sol is 1:0.6, Al 2 O 3 The volume fraction of particles is 23% of the total volume of PTFE emulsion and KH-560 modified silica sol. The PTFE emulsion, KH-560 modified silica sol and Al 2 O 3 The mixture of particles is magnetically stirred for 4 hours to obtain PTFE / SiO 2 / Al 2 O 3 Homogeneous mixture.

[0061] (2) The surface of porous aluminum is roughened

[0062] Porous aluminum with a porosity of 80%, a pore diameter of 2 mm and a through-hole structure was etched for 120s in a 1 mol / L NaOH solution. The corroded porous aluminum was washed by shaking with deionized wat...

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Abstract

The invention discloses a preparation method of a PTFE/SiO2/Al2O3 porous membrane coated on the surface of porous aluminum, and belongs to the technical field of porous metal material surface treatment. The preparation method comprises the steps of adopting a PTFE emulsion, a KH-560 modified silica sol and Al2O3 particles as raw materials, and uniformly mixing the raw materials according to the matching ratio so as to obtain a uniform PTFE/SiO2/Al2O3 mixed solution; secondly, dipping the surface-roughened porous aluminum in the PTFE/SiO2/Al2O3 mixed solution, coating, curing, and obtaining a PTFE/SiO2/Al2O3 film layer with the thickness being 40 to 60mum on the surface of the porous aluminum; and finally, using hydrochloric acid for corroding and removing the Al2O3 particles exposed on thePTFE/SiO2/Al2O3 membrane layer on the surface of the porous aluminum, and forming the PTFE/SiO2/Al2O3 porous membrane with the surface porosity being 5 to 40 percent and the surface aperture being 1to 10mum on the surface of the porous aluminum. The PTFE/SiO2/Al2O3 porous membrane coated on the surface of the porous aluminum prepared through the invention is high in specific surface area, controllable in surface hole structure, good in corrosion resistance and hydrophobicity, simple in preparation process, and capable of realizing industrial production.

Description

technical field [0001] The invention relates to a porous aluminum surface coated with PTFE / SiO 2 / Al 2 o 3 The invention discloses a method for preparing a porous membrane, which belongs to the technical field of porous metal surface modification. Background technique [0002] The porous aluminum sound-absorbing material with a through-hole structure has irreplaceable safety and environmental protection properties such as high strength and toughness, high temperature resistance, non-moisture absorption, and recyclability. It has broad application prospects in noise control fields such as machine room, engine (electric) machine room, audio room, swimming pool, KTV private room, etc. [0003] Aluminum and aluminum alloys are amphoteric metals with lively properties. They are easily corroded in complex use environments and reduce their service life. This is an important problem that must be solved in the application of porous aluminum sound absorption functions. [0004] Th...

Claims

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Application Information

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IPC IPC(8): B05D7/14B05D3/10B05D3/00B05D7/24B05D5/00
CPCB05D3/007B05D3/102B05D3/107B05D5/00B05D7/14B05D7/24B05D2202/25B05D2506/15B05D2601/20B05D2602/00
Inventor 左孝青谭彪白金德周芸罗晓旭陈显宁
Owner KUNMING UNIV OF SCI & TECH
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