A drag-reducing micro-nano composite structure for hull and its preparation method

A composite structure, micro-nano technology, applied in the field of preparation of ship hull micro-nano structure, can solve the problem of neglecting the wettability of the hull surface, and achieve the effects of easy operation, reduced forward resistance and low cost

Active Publication Date: 2020-08-28
空间液态金属科技发展江苏有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods are only limited to the design of the structure, while ignoring the wettability of the hull surface

Method used

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  • A drag-reducing micro-nano composite structure for hull and its preparation method
  • A drag-reducing micro-nano composite structure for hull and its preparation method
  • A drag-reducing micro-nano composite structure for hull and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0034] For the preparation method, see figure 1 , this embodiment is a method for preparing an anisotropic superhydrophobic structure, which can effectively reduce the running resistance of the hull, and specifically includes the following steps:

[0035] (1) Put the tip of the surgical blade outward, and stick solder on the other end, and perform welding operation under a microscope by micromachining, so that the tip of the scalpel is closely arranged on the surface of the metal roller to form an array with controllable spacing. A metal rod with a scalpel blade is rolled on the surface of a high-density polyethylene (PE) plate, leaving an array of scalpel blade anti-structures.

[0036] (2) PDMS (polymethylsiloxane) and curing agent are mixed at a volume ratio of 10:1, vacuumed to remove internal air bubbles, and then poured on the surface of the PE template. After a curing time of 3 hours, the template was uncovered to obtain a flexible anisotropic surgical blade structure ...

Embodiment 2

[0046] This embodiment is a method for preparing an anisotropic superhydrophobic structure, which specifically includes the following steps:

[0047] (1) Fix the surgical blade (commercially available) on the three-dimensional platform at an angle of 45 degrees, and control the spacing of each microstructure through the x and y directions of the three-dimensional platform, which can be regulated at 50-500 microns; through z (vertical) Adjust the depth in the direction to adjust the height of the structure, periodically focus on the surface of the PE board, and form a blade anti-structure array on the surface of the PE board.

[0048] (2) PDMS (polymethylsiloxane) and curing agent are mixed at a ratio of 15:1, the internal air bubbles are removed by vacuum, and then poured on the surface of the PE template. After a curing time of 3 hours, the template was uncovered to obtain a flexible anisotropic surgical blade structure on the PDMS substrate.

[0049] (3) The preparation of ...

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PUM

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Abstract

The invention discloses a hull drag reduction micro-nano composite structure. The hull drag reduction micro-nano composite structure is a triangular pyramid-shaped blade structure array arranged on the surface of a base body; the triangular pyramid is in the form of an acute triangle from an overlooking angle; the acute angle of the pointed end of the triangle is 7-10 degrees; and the length of the blade structure is 200-600 microns. The invention further discloses a preparation method of the hull drag reduction micro-nano composite structure. The invention provides a simple and low-cost method for preparing an aeolotropic super-hydrophobic structure; and a hull drag reduction problem is solved, the energy consumption is saved, and the ship sailing distance is prolonged.

Description

technical field [0001] The invention belongs to the field of marine equipment, and in particular relates to a method for preparing a drag-reducing hull micro-nano structure. Background technique [0002] The traditional method of hull drag reduction is to achieve the drag reduction effect by designing a streamlined structure or making a smooth surface on the hull shell. However, these methods are only limited to the design of the structure, while ignoring the wettability of the hull surface. For example, when the ship is moving forward, the water flow will stagnate on the surface of the hull, thereby forming laminar or turbulent flow. On the surface of superhydrophobic materials, because the adhesion force at the solid-liquid interface is very small, it is difficult to form a laminar flow, and the resistance of the fluid directly rubbing against the solid surface is very small. With the help of the special anisotropic microstructure, it is difficult for the fluid to form a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B63B1/40C09D1/00C08J7/12C08L83/04
CPCB63B1/40C08J7/12C08J2383/04C09D1/00Y02T70/10
Inventor 王磊刘静
Owner 空间液态金属科技发展江苏有限公司
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