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Preparation method of frost-inhibiting and defrosting super-hydrophobic surface structure

A technology of super-hydrophobic surface and topological structure, which is applied in the direction of surface coating liquid device, special surface, metal material coating process, etc., can solve the problems of inability to process in large batches, high economic cost, etc., and reduce the frost layer Coverage, avoiding secondary icing, simple and economical surface processing methods

Pending Publication Date: 2021-04-30
UNIV OF SHANGHAI FOR SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, this kind of processing method relies on the investment of large-scale equipment such as ultra-clean room environment and lithography machine, and the economic cost is high and it cannot be processed in large scale.

Method used

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  • Preparation method of frost-inhibiting and defrosting super-hydrophobic surface structure
  • Preparation method of frost-inhibiting and defrosting super-hydrophobic surface structure
  • Preparation method of frost-inhibiting and defrosting super-hydrophobic surface structure

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Embodiment

[0031] Take a piece of 2mm thick, 4×4cm 2 Taking the smooth copper sample as an example, the preparation process of superhydrophobic sample 16 is as follows figure 1 , figure 2 shown.

[0032] Step (1): Take a 2mm thick piece, 4×4cm 2 The smooth pure copper sheet 1 was processed by micromachining on the mirror surface with an array of circular arc grooves with a central angle of 120° and an arc length of 500 μm to obtain a sample 2 with an array of micron-scale arc grooves.

[0033] Step (2): Completely immerse the sample 2 having the array of micron-scale arc grooves processed in step (1) in the acetone solution 3 , and perform ultrasonic cleaning for 10 minutes by an ultrasonic cleaning machine 4 . Subsequently, the ultrasonically cleaned samples were rinsed with isopropanol (IPA) and deionized water in sequence, and dried with clean nitrogen.

[0034] Step (3): Soak the sample 2 with the array of micron-scale arc grooves treated in step (2) in NaClO at 96±3°C 2 , NaOH...

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Abstract

The invention relates to a preparation method of a frost-inhibiting and defrosting super-hydrophobic surface structure. The preparation method comprises the following steps of processing an equidistant micron-sized arc groove array on a smooth substrate sample surface, cleaning the sample with the micron-sized arc groove array, carrying out heating oxidation in a mixed alkali solution to form a layer of micro-nano blade-shaped structure on the sample surface, preparing a sample surface with a micro-nano topological structure, then silanizing the sample surface to form a layer of monomolecular hydrophobic group, and enabling the monomolecular hydrophobic group to be in a superhydrophobic state; Compared with an existing frost prevention and removal technology, two main changes are made, firstly, an ultra-clean chamber and photoetching equipment are not needed, and the micro-nano topological structure is directly processed on the surface of a metal substrate; and secondly, the surface design has frost inhibiting and defrosting properties at the same time, the application range is wide, and the method is suitable for various types of heat exchangers such as tube fins and micro-channels with copper or aluminum or aluminum alloy as a substrate material.

Description

technical field [0001] The invention relates to the technical field of processing and preparation, in particular to a method for preparing a frost-suppressing and defrosting super-hydrophobic surface structure. Background technique [0002] Condensation frosting is the most common form of icing in industrial production. However, the accumulation of frost layer often causes harm to the corresponding industrial process, especially for heat exchangers operating under low temperature conditions. Due to the porous structure of the frost layer introduced The heat transfer process is often seriously hindered. [0003] The traditional technical means to solve the problem of frost accumulation mainly include the following three types: (1) spraying alcoholic organic solvents or salts to reduce the freezing point of the mixed frost layer; (2) directly or indirectly absorbing external heat sources to melt the frost layer, Such as external infrared radiation source and embedded conducti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D5/00B05D7/14B05D7/24C23C22/60
CPCB05D5/00B05D7/14B05D7/24C23C22/60B05D2202/25B05D2202/45B05D2518/10
Inventor 赵玉刚黄承志汤海波王东民
Owner UNIV OF SHANGHAI FOR SCI & TECH
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