CN101891142B - Method for preparing active, flow impact resistant and non-lotus-like super-hydrophobic surface - Google Patents
Method for preparing active, flow impact resistant and non-lotus-like super-hydrophobic surface Download PDFInfo
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- CN101891142B CN101891142B CN2010102231074A CN201010223107A CN101891142B CN 101891142 B CN101891142 B CN 101891142B CN 2010102231074 A CN2010102231074 A CN 2010102231074A CN 201010223107 A CN201010223107 A CN 201010223107A CN 101891142 B CN101891142 B CN 101891142B
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Abstract
The invention discloses a method for preparing an active, flow impact resistant and non-lotus-like super-hydrophobic surface. The method specifically comprises the following steps of: (1) hydrophobizing a perforated porous material and modifying the porous surface and the outermost surface of the porous material into surfaces which form a contact angle of over 90 degrees with water, wherein the aperture and interval of the perforated porous material are 2 to 500 mu m respectively; and (2) introducing air or nitrogen to one side of the surface-hydrophobic perforated porous material to obtain the active, flow impact resistant and non-lotus-like super-hydrophobic surface on the other side of the perforated porous material. The preparation method has the advantages of simple operation process, low cost, high environment protection performance and repetition and favorability for large-area preparation. The prepared non-lotus-like surface can realize an active super-hydrophobic property and have persistent super-hydrophobic performance such as flow impact resistance, resistance to the friction of boundary layer of solid and liquid, static pressure penetration resistance and the like so as to be expected to be used for reducing the resistance of surface vessels.
Description
(1) technical field
The present invention relates to a kind of method for preparing active, flow impact resistant, non-lotus-like super-hydrophobic surface.
(2) background technology
Mostly present artificial super hydrophobic surface is that obtaining inspiration from the lotus leaf surface micro-structural develops; Although the preparation method is various; But its hydraulic pressure resistance ability is unsatisfactory always: in case having surpassed its surface can for the kinetic energy of water droplet (by the water velocity decision); Mastoid process or spine structure can puncture water droplet, make the ultra-hydrophobicity forfeiture.When being applied to fluid drag-reduction, the strong friction in interface that such air of sheltering in micro-coarse structured is easy to caused by turbulent flow is driven out of, thus the forfeiture resistance reducing performance.Seek out the forever stable super hydrophobic surface that promptly current is continued drag reduction of hydraulic pressure, be necessary to design a kind of brand-new, be different from the novel surface structure of lotus leaf surface micro-structural fully, realize initiatively super-hydrophobicly, be used for the drag reduction noise reduction of the water surface even submarine navigation device.
(3) summary of the invention
The technical problem that the present invention will solve provides a kind of low cost, technology is simple, is easy to the method for large-scale production active, flow impact resistant, non-lotus-like super-hydrophobic surface.
For solving the problems of the technologies described above, the present invention adopts following technical scheme:
The preparation method of a kind of active, flow impact resistant, non-lotus-like super-hydrophobic surface, through initiatively introducing air-flow, the novel super hydrophobic surface that contains hole surface formation flow impact resistant that hydrophobization is handled specifically may further comprise the steps:
(1) will connect porous material and do hydrophobization and handle, the contact angle of hole surface that connects porous material and outermost surface modification Cheng Yushui surface greater than 90 °; The pore size of said perforation porous material and interval are respectively at 2-500 μ m;
(2) at the perforation porous material one side blowing air or the nitrogen of surface hydrophobicity, then obtain active, flow impact resistant, non-lotus-like super-hydrophobic surface in an other side that connects porous material.
Further, perforation porous material of the present invention is metallic sieve (like stainless steel mesh), polymer mesh, stainless steel sintered fiber felt, glass cloth, foam metal (like the powder of stainless steel sintered sheets).
Further, described hydrophobization is handled can adopt existing method, adopts low-surface-energy material (methyl-monosilane, fluorine containing silane, polyolefin, fluoropolymer etc.), with interfacial reaction, spray, soak mode such as mould and handle the perforation porous material.Those skilled in the art can select suitable process for hydrophobicizing voluntarily according to the material that connects porous material.Concrete; Such as to metallic sieve; Available polytetrafluoroethylene (PTFE) carries out hydrophobization to be handled, and is about to metallic sieve and is immersed in PTFE micro mist (the about 0.05-0.5 μ of the particle diameter m) suspension 0.5～20 minute, takes out dry (preferred drying 10～30min in 150～250 ℃ of baking ovens earlier then; Dry 1～5min) in 280～320 ℃ of baking ovens again, can be with the contact angle of the hole surface of metallic sieve and outermost surface modification Cheng Yushui surface greater than 90 °.Again such as the material that stainless steel sintered fiber felt, glass cloth and foam metal etc. is contained non-single layer hole; Can adopt following method to carry out hydrophobization handles: the material that will contain non-single layer hole was immersed in the chloroformic solution that mass concentration is 1～5% dichloro methyl silane 10～30 minutes; Take out the nature airing, the contact angle of hole surface and outermost surface modification Cheng Yushui that can will contain non-single layer hole material is greater than 90 ° surface.
Further, the pore size of the preferred said perforation porous material of the present invention is 20-100 μ m with the interval.
Further, a side blowing air or a nitrogen of the described perforation porous material at surface hydrophobicity of recommendation step of the present invention (2), generally speaking, as long as continue air blast in a side, opposite side can obtain active, flow impact resistant, non-lotus-like super-hydrophobic surface.The air-blowing flow of nitrogen or air is at 0.01-100L/scm
2, preferred 0.1-1L/scm
2Described " cm
2" for connecting the square measure of porous material.
Consider concrete application scenario; Can adopt following method bubbling air or nitrogen: the perforation porous material of surface hydrophobicity is covered or covers in a bottom (or top) to be had on the hemi-closure space of ventilating opening; Form enclosure space, (or top) feeds nitrogen or air from the bottom then.
Among the present invention, describedly obtain super hydrophobic surface in an other side and be meant, add the hydrophobic property of porous material surface owing to continue to ventilate; Water droplet is difficult to sprawl at this surface adhesion; Be complete super-hydrophobic state, promptly not only have the contact angle more than 150 °, also have the roll angle below 10 °.
Among the present invention, described active is super-hydrophobic to be meant that super hydrophobic surface ends the dependence upon the passive air of sheltering and realizes super-hydrophobicly, but leans on initiatively bubbling to realize that the surface is to the ultra thin of water or repulsion.
Among the present invention, described water-fast impact is meant compares lotus leaf and the artificial super hydrophobic surface of imitative lotus leaf, and institute's control surface has very high flow impact resistant ability.Specifically decide according to air-blowing flow and mesh size.
Among the present invention, described non-lotus leaf type is meant that institute's control surface is structures such as the hole that forms of mesh, crossed fiber and abscess, but not the micro-nano mastoid process structure of lotus leaf surface.
The present invention can adopt ESEM (SEM) to come observation post to get surperficial microscopic appearance; Measure the water contact angle (comprising static contact angle and roll angle) on gained surface with contact angle measurement; Take current spring behavior from the teeth outwards with high-speed camera, judge the flow impact resistant ability of this super hydrophobic surface whereby.
The super-hydrophobicity on the present invention surface and flow impact resistant ability can be by the pore sizes of porous material, at interval, factors such as hydrophobic treatments degree and air-blowing flow decide.
The novel super hydrophobic surface that the present invention makes can obtain important application in navigation unit by water drag reduction field.
Compared with prior art; The inventive method operating procedure is simple, cost is low, the feature of environmental protection and good reproducibility; And be easy to large-area preparation, the non-lotus leaf type of gained surface can be realized initiatively super-hydrophobic, and has lasting ultra-hydrophobicity such as flow impact resistant, the boundary layer friction of anti-solid-liquid the, anti-static pressure infiltration; Be expected to be used for the drag reduction of navigation unit by water, have important practical applications and be worth.
(4) description of drawings
Fig. 1 is that 150 order stainless steel mesh are handled back SEM photo and contact angle with the PTFE hydrophobization;
Fig. 2 is that 500 order stainless steel mesh are handled back SEM photo and contact angle with the PTFE hydrophobization;
Fig. 3 is that effective aperture is SEM photo and the corresponding contact angle after 1200 purpose stainless steel sintered fiber felts are handled with the dichloro methyl silane hydrophobization;
Fig. 4 is a powder of stainless steel sintered sheets digital photograph;
Fig. 5 is under 4.5L/s air-blowing amount, and water impact arrives the not online moment sectional drawing of 500 order stainless steel sifts of hydrophobic treatments, and water droplet forms adhesional wetting in screen surface, shows spring, so do not have ultra-hydrophobicity;
Fig. 6 is under 1.5L/s air-blowing amount, the online moment sectional drawing of 500 order stainless steel sifts that water impact is handled to PTFE, and light dash area shows water droplet spring and rolling behavior among the figure, the clear water droplet in the right is spherical in shape.The proof screen surface possesses initiatively ultra-hydrophobicity;
Fig. 7 is under 3L/s air-blowing amount, the online moment sectional drawing of 500 order stainless steel sifts that water impact is handled to PTFE, and light dash area shows water droplet spring and rolling behavior among the figure, middle clear big water droplet and numerous little water droplet are spherical in shape.The proof screen surface possesses initiatively ultra-hydrophobicity;
Fig. 8 is under 4.5L/s air-blowing amount, the online moment sectional drawing of 500 order stainless steel sifts that water impact is handled to PTFE, and light dash area shows water droplet spring and rolling behavior among the figure, and water droplet broad in the middle is elliposoidal, and the little water droplet in the right is spherical in shape.The proof screen surface possesses initiatively ultra-hydrophobicity;
Fig. 9 is under 3L/s air-blowing amount, the moment sectional drawing of water impact to the stainless steel fibre felt of hydrophobic treatments, and light dash area shows water droplet spring and rolling behavior among the figure, middle clear water droplet is spherical in shape.
Proof fibrofelt surface possesses initiatively ultra-hydrophobicity;
Figure 10 is to be template with the stainless steel mesh, passive, the imitative lotus-like super-hydrophobic surface that makes through the little moulding technology of hot pressing-stretching;
(5) specific embodiment
Following instance further specifies the present invention, but these instances are not used for limiting the present invention.
Embodiment 1
With not handling the disk that 500 order stainless steel mesh are cut into the about 4cm of diameter with the PTFE hydrophobization, be fixed on the suction filtration bottleneck (Fig. 5), feed the N of 4.5L/s then at the vacuum pumping port place
2Stream at 1 meter current of highly locating to apply freely falling body, finds that water impact behind stainless steel mesh, forms adhesional wetting with vinyon water bottle (500mL, water outlet bore 1mm), does not promptly have super-hydrophobic phenomenon (Fig. 5).
Embodiment 2
Other is with embodiment 1; But stainless steel mesh is handled with the polytetrafluoroethylene (PTFE) hydrophobization; Be about to stainless steel mesh and be immersed in PTFE micro mist (the about 0.05-0.5 μ of the particle diameter m) suspension 10 minutes, take out then first in 200 ℃ of baking ovens dry 30min, dry 2min in 300 ℃ of baking ovens again.Its microstructure and static water droplet contact angle such as Fig. 2.Can find out that even if refuse any air-blowing, screen surface has been superhydrophobic property.PTFE is handled the back stainless steel mesh with being fixed among the embodiment 1 on the suction filtration bottleneck, feed the N of 1.5L/s
2Stream; At 1 meter current of highly locating to apply freely falling body, find that current present the behavior of more significantly bouncing with vinyon water bottle (500mL, water outlet bore 1mm) after touching screen cloth; Water droplet is ball-shaped basically, and promptly screen cloth has possessed initiatively ultra-hydrophobicity (Fig. 6).
Embodiment 3
Other is with embodiment 2, but uses the N of 4.5L/s instead
2Stream finds that current present the behavior of very significantly bouncing after touching screen cloth, and water droplet is ball-shaped, and promptly screen cloth has possessed initiatively ultra-hydrophobicity (Fig. 8).
Embodiment 4
With effective aperture is that 1200 purpose stainless steel sintered fiber felts are immersed in 10min in the chloroformic solution that mass concentration is 2% dichloro methyl silane, takes out back dry 1h in 100 ℃ of baking ovens, its microstructure and static water droplet contact angle such as Fig. 3.Can find out that fibrofelt is after handling with methyl-monosilane, surface contact angle is hydrophobic property up to 126.3 °, but is not super-hydrophobic.With embodiment 2, be fixed on the suction filtration bottleneck then, feed the N of 3L/s
2Stream finds that current present tangible spring behavior after touching screen cloth, and water droplet is ball-shaped, and promptly stainless steel sintered fiber felt has possessed initiatively ultra-hydrophobicity (Fig. 9).
Embodiment 5 (reference examples)
With 500 order stainless steel mesh (the balcony first screen cloth factory) 180 ℃ ,～500g/cm
2Under be hot-pressed onto HDPE (Korea S big forest products industry company, 5502) sheet surface, be cooled to 100 ℃ with screen cloth from the HDPE sur-face peeling, obtain having the HDPE super hydrophobic surface (Figure 10) of imitative lotus leaf micro-protuberance structure.But such super hydrophobic surface stability is not good enough, shows as when with the water droplet of 20 μ L size during respectively from differing heights freely falling body to this super hydrophobic surface, find the water droplet height of drop high more be that impact kinetic energy is big more, it is more little that contact angle becomes.After surpassing 50cm, the HDPE surface becomes hydrophilic (seeing table 1) by hydrophobic.By contrast, the present invention has promptly obtained active, flow impact resistant, non-lotus-like super-hydrophobic surface at the perforation porous material one side blowing air or the nitrogen of surface hydrophobicity in an other side that connects porous material easily.
The contact angle of water droplet after obstructed height place freely drops on the HDPE super hydrophobic surface of table 120 μ L size
Claims (4)
1. the preparation method of the super hydrophobic surface of an active, flow impact resistant, non-lotus leaf type may further comprise the steps:
(1) will connect porous material and do hydrophobization and handle, the contact angle of hole surface that connects porous material and outermost layer modification Cheng Yushui surface greater than 90 °; The pore size of said perforation porous material is 2～500 μ m with the interval;
(2) at the perforation porous material one side blowing air or the nitrogen of surface hydrophobicity, nitrogen or air at the air-blowing flow that connects porous material one side at 0.01～100L/scm
2, then obtain the super hydrophobic surface of active, flow impact resistant, non-lotus leaf type in an other side that connects porous material.
2. press the preparation method of the super hydrophobic surface of the described active of claim 1, flow impact resistant, non-lotus leaf type, it is characterized in that described perforation porous material is woven wire, polymer silk screen, stainless steel sintered fiber felt, glass cloth or foam metal.
3. press the preparation method of the super hydrophobic surface of the described active of claim 1, flow impact resistant, non-lotus leaf type, it is characterized in that the pore size of described perforation porous material and be 20～100 μ m at interval.
4. by the preparation method of the super hydrophobic surface of the described active of claim 1, flow impact resistant, non-lotus leaf type, it is characterized in that in the said step (2), nitrogen or air at the air-blowing flow that connects porous material one side at 0.1～1L/scm
2
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| CN117186749A (en) * | 2023-04-26 | 2023-12-08 | 西安热工研究院有限公司 | Micro-flow jet scale-proof super-hydrophobic coating material and preparation method thereof |
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| CN1387932A (en) * | 2001-05-28 | 2003-01-01 | 北京二元世纪技术有限公司 | Nano-interface separating net with self-cleaning function and its making process and use |
| CN101092289A (en) * | 2007-05-18 | 2007-12-26 | 华东理工大学 | A super hydrophobic material with roughened surface |
| CN101285168A (en) * | 2008-01-11 | 2008-10-15 | 北京工业大学 | Preparation method of porous conducting nano copper film material with ultra- hydrophobicity |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1387932A (en) * | 2001-05-28 | 2003-01-01 | 北京二元世纪技术有限公司 | Nano-interface separating net with self-cleaning function and its making process and use |
| CN101092289A (en) * | 2007-05-18 | 2007-12-26 | 华东理工大学 | A super hydrophobic material with roughened surface |
| CN101285168A (en) * | 2008-01-11 | 2008-10-15 | 北京工业大学 | Preparation method of porous conducting nano copper film material with ultra- hydrophobicity |
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Address after: No. 999, Changhong East Street, Deqing County, Huzhou City, Zhejiang Province Moganshan campus, Zhejiang University of Technology Patentee after: Zhejiang University of Technology Address before: Hangzhou City, Zhejiang province 310014 City Zhaohui District Six Patentee before: Zhejiang University of Technology |