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A self-healing superhydrophobic drag-reducing elastomer film and its preparation method

An elastomer and super-hydrophobic technology, applied in the field of self-healing super-hydrophobic membrane preparation, can solve problems such as disappearance and performance degradation, and achieve good drag reduction effect

Active Publication Date: 2020-05-01
NORTHWESTERN POLYTECHNICAL UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The wear-resistant film has good durability, but after several times of friction, the performance will inevitably decrease until it disappears

Method used

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  • A self-healing superhydrophobic drag-reducing elastomer film and its preparation method
  • A self-healing superhydrophobic drag-reducing elastomer film and its preparation method
  • A self-healing superhydrophobic drag-reducing elastomer film and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] After the subcutaneous fat is completely removed from the fresh shark skin, it is soaked in formalin for 12 hours, then taken out and sandwiched between two glass plates for heating and drying. Then attach the surface with microstructure to the acrylic plate and put it into the flat vulcanizing machine, load 5MPa pressure at 100°C, turn on the condensed water cooling after 15 minutes, unload the pressure after the temperature drops to 60°C, and take out the acrylic Plate, remove the shark skin attached to the mold according to the natural arrangement of the scales and pull the mold in the opposite direction along the scales, and finally get a template with a groove structure on the surface of the shark skin.

[0038]The polyurethane elastomer is mixed with silica particles with a mass fraction of 50%, and rolled onto a template with a groove structure on the surface of shark skin, and cured by heating. After curing is complete, the elastomeric film is peeled off from th...

Embodiment 2

[0046] After the subcutaneous fat is completely removed from the fresh shark skin, it is soaked in formalin for 12 hours, then taken out and sandwiched between two glass plates for heating and drying. Then attach the surface with microstructure to the acrylic plate and put it into the flat vulcanizing machine, load 4MPa pressure at 110°C, turn on the condensed water cooling after 10 minutes, unload the pressure after the temperature drops to 70°C, and take out the acrylic Plate, remove the shark skin attached to the mold according to the natural arrangement of the scales and pull the mold in the opposite direction along the scales, and finally get a template with a groove structure on the surface of the shark skin.

[0047] The polyurethane elastomer is mixed with titanium dioxide particles with a mass fraction of 75%, and rolled onto a template with a groove structure on the surface of shark skin, and cured by heating. After curing is complete, the elastomeric film is peeled ...

Embodiment 3

[0055] After the subcutaneous fat is completely removed from the fresh shark skin, it is soaked in formalin for 12 hours, then taken out and sandwiched between two glass plates for heating and drying. Then attach the surface with microstructure to the acrylic plate and put it into the flat vulcanizing machine, load 3MPa pressure at 120°C, turn on the condensed water cooling after 5min, unload the pressure after the temperature drops to 80°C, and take out the acrylic Plate, remove the shark skin attached to the mold according to the natural arrangement of the scales and pull the mold in the opposite direction along the scales, and finally get a template with a groove structure on the surface of the shark skin.

[0056] The polyurethane elastomer and the mass fraction of 100% Fe 3 o 4 / SiO 2 Composite particles are mixed, roller coated on a template with grooved structure on the surface of sharkskin, and cured by heating. After curing is complete, the elastomeric film is peel...

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Abstract

The invention relates to a self-repairing super-hydrophobic anti-drag elastomer thin film and a preparation method thereof. A sharkskin V-shaped groove structure is copied on the surface of an elastomer, and a polyarcylamide-polyfluoroalkyl acrylate segmented copolymer capable of self assembling and forming a micro-nano structure is further grafted on the surface of the elastomer; thus, the thin film has self-repair super-hydrophobic performance, a static water contact angle can reach 150 degrees or more, and a rolling angle is smaller than 10 degrees. When the anti-drag film is attached to a rotational viscometer rotor to perform an anti-drag performance test, drag reducing efficiency can reach 20%. The self-repairing super-hydrophobic anti-drag elastomer thin film disclosed by the invention has the advantages that 1, a super-hydrophobic anti-drag method and a bionic anti-drag method are combined together, so that the anti-drag film can have a better anti-drag effect under a laminar condition and a turbulent condition; 2, after surface chemical components of polyfluoroalkyl acrylate grated to the surface of the super-hydrophobic film are damaged, the polyfluoroalkyl acrylate can be self repaired after being soaked by a solvent or being heated under high temperature, so that the film can have a super-hydrophobic effect again.

Description

technical field [0001] The invention belongs to the preparation of a self-repairing super-hydrophobic film, and relates to a self-repairing super-hydrophobic drag-reducing elastomer film and a preparation method thereof. Background technique [0002] As my country's dependence on imported energy continues to increase, how to reduce energy consumption and improve energy utilization is becoming a major issue that needs to be solved urgently and is related to the sustainable development of my country's economy. Some data show that for ships, airplanes and other means of transportation, the greatest energy consumption lies in overcoming the frictional resistance between the water flow or air medium in contact with them. According to statistics, under normal circumstances, the surface frictional resistance of a ship accounts for about 70-80% of the total resistance when it is in motion; the surface frictional resistance of a civil aircraft accounts for almost 50% of the total res...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J7/16C08J7/12C08L75/04C08L83/04
CPCC08J7/12C08J7/16C08J2375/04C08J2383/04C08J2433/16C08J2433/26
Inventor 张秋禹刘毅彬张和鹏张宝亮
Owner NORTHWESTERN POLYTECHNICAL UNIV
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