CN101885257B - Method for preparing transparent organic hydrophobic coating on surface of aluminum plate - Google Patents
Method for preparing transparent organic hydrophobic coating on surface of aluminum plate Download PDFInfo
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- CN101885257B CN101885257B CN 201010209102 CN201010209102A CN101885257B CN 101885257 B CN101885257 B CN 101885257B CN 201010209102 CN201010209102 CN 201010209102 CN 201010209102 A CN201010209102 A CN 201010209102A CN 101885257 B CN101885257 B CN 101885257B
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Abstract
The invention discloses a method for preparing a transparent organic hydrophobic coating on the surface of an aluminum plate. The method comprises the following steps of: preparing hydrolysis solution; processing the aluminum plate with the hydrolysis solution and drying the aluminum plate; coating a silicone glass resin on the aluminum plate; and heating the aluminum plate. The organic coating prepared by the invention can effectively resist the corrosion of acid solution with pH of 3.5; the surface of the coating after being corroded for 168 hours still is not obviously changed; the coating has high adhesive force to the aluminum plate, so the coating does not crack or shed when folded; the test of a WS-2002 coating adhesive force automatic scratch tester shows that the adhesive force between the coating and the matrix of the aluminum plate reaches 40N; the coating does not shed after being circulated for 50 times in hot water of 95 DEG C and cold water of 20 DEG C; the contact angle between pure water and the surface of the coating is close to 120 degrees; and the coating has high hydrophobicity, obvious self-cleaning effect and light transmittance of 96 percent.
Description
Technical field
The present invention relates to a kind of preparation method of organic hydrophobic coating, belong to technical field of composite materials.
Background technology
At present; Being coated with organic coating in surface of aluminum plate only limits to aluminium sheet anti-corrosion protection is provided; And organic coating is not enough to the adhesive force of surface of aluminum plate, and the elastic modelling quantity of organic coating and aluminium differs greatly in addition, therefore; For fear of problems such as organic coating in process ftracture, comes off,, aluminium sheet production is coated with organic coating often after being the finished product product again.In addition; The hydrophobicity of organic coating itself makes it to have certain self-cleaning function; And the metal surface organic coating that makes of public reported realizes that super-hydrophobic method has tangible deficiency at present: the used complex process of these methods, not only need introduce the low-surface-energy group to the organic-containing materials modification; Also need be in the micro-structural of surface construction certain roughness, so these methods are difficult to be applied to the protection of reflector that surface smoothness is had relatively high expectations; Simultaneously, the organic coating that these methods are prepared does not still have the report that under outdoor environment, has long-term weatherability.
Summary of the invention
For the deficiency of improving existing surface of aluminum plate organic coating poor adhesive force, preparation technology and complex equipments, high hydrophobicity and service life being difficult to get both, the invention provides a kind of preparation method of transparent organic hydrophobic coating on surface of aluminum plate simple to operate.
The present invention adopts following technical scheme:
A kind of preparation method of transparent organic hydrophobic coating on surface of aluminum plate may further comprise the steps:
1) cleaning surface of aluminum plate, air dry then;
2) (structural formula is H with gamma-aminopropyl-triethoxy-silane
2N (CH
2)
3Si (OC
2H
5)
3) with distilled water and ethanol mixed hydrolysis by a certain percentage;
3) said hydrolyzed solution is handled surface of aluminum plate with the showering mode or aluminium sheet is dipped in the hydrating solution handles, this processing procedure keeps 30s～2min, aluminium sheet is placed under 150 ℃～200 ℃ conditions dry 20min～30min then;
4) apply silicone glass resin (trade mark XT-101, solid content >=30%, 25 ℃ following viscosity is 5～50mpas, the pH value is 5～6) in above-mentioned treated surface of aluminum plate, and place under 90 ℃～120 ℃ conditions and heat 10min～15min.
Described gamma-aminopropyl-triethoxy-silane, distilled water and absolute ethyl alcohol, three's volume ratio are (2～4): (1～2): 40.
The invention has the beneficial effects as follows: the acid solution that can effectively resist pH=3.5 at the prepared organic coating of surface of aluminum plate corrodes, and coating surface does not still have significant change behind the corrosion 168h; Coating has very high adhesive force to aluminium sheet, with the aluminium sheet doubling time, does not still ftracture, comes off, and through the automatic scratching instrument test of WS-2002 coating adhesion, the adhesive force of coating and aluminium sheet matrix has reached 40N; This coating does not still have obscission after the circulation 50 times in 95 ℃ of hot water and 20 ℃ of cold water; Pure water near 120 °, has better hydrophobic at the contact angle of this coating surface, and the automatically cleaning effect is obvious; This coating light transmittance reaches 96%, can be applicable to the surface treatment of reflective aluminium sheet.
Description of drawings
Fig. 1 is a silicone glass resin principal component structural formula.
Fig. 2 is a process chart of the present invention.
Fig. 3 is the electron scanning micrograph that adopts the sample section of the inventive method after surface of aluminum plate is coated with organic coating, and the coating of the inventive method preparation is made up of two-layer: the silicone glass resin coating of the about 2 μ m of intermediate layer as thin as a wafer that contacts with surface of aluminum plate and outermost thickness.
The specific embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is described further.
Embodiment 1
A kind of preparation method of transparent organic hydrophobic coating on surface of aluminum plate selects common 1060 rolling aluminium sheets for use, according to step shown in Figure 2:
1) at first use ethanol cleaning surface of aluminum plate, with remove the surface residual greasy dirt etc. influence the dirt of next step and silane reaction, use flushing with clean water again, air dry;
2) with gamma-aminopropyl-triethoxy-silane, distilled water and absolute ethyl alcohol (analyzing pure) preparation hydrating solution, three's volume ratio is 2: 1: 40.The hydrating solution that preparation is accomplished places 20 ℃ environment to keep 100min down, can stir hydrating solution during this period.
3) hydrating solution is handled surface of aluminum plate with the showering mode, this process keeps 2min, aluminium sheet is placed under 150 ℃ of conditions dry 30min then.
4) apply silicone glass resin in above-mentioned treated surface of aluminum plate, and place under 90 ℃ of conditions and heat 15min.
A kind of preparation method of transparent organic hydrophobic coating on surface of aluminum plate selects the AA1070 aluminium sheet for use, according to step shown in Figure 2:
1) at first use ethanol cleaning surface of aluminum plate, with remove the surface residual greasy dirt etc. influence the dirt of next step and silane reaction, use flushing with clean water again, air dry;
2) with gamma-aminopropyl-triethoxy-silane, distilled water and absolute ethyl alcohol (analyzing pure) preparation hydrating solution, three's volume ratio is 4: 1: 40.The hydrating solution that preparation is accomplished places 30 ℃ environment to keep 70min down, can stir hydrating solution during this period.
3) hydrating solution is handled surface of aluminum plate with the showering mode, or aluminium sheet is dipped in the hydrating solution, make the reaction of hydrating solution and surface of aluminum plate, this process keeps 1min, aluminium sheet is placed under 200 ℃ of conditions dry 20min then.
4) apply silicone glass resin in above-mentioned treated surface of aluminum plate, and place under 120 ℃ of conditions and heat 10min.
Embodiment 3
The prepared organic coating of the inventive method has mainly carried out the test of section SEM test analysis and performances such as hydrophobicity, adhesive force, light transmittance, corrosion resistance and weatherability.
The aluminium sheet that 1) will have an organic coating cuts into the sample of 0.5cm * 1cm size, clamps with copper sheet, grinds metallographic specimen.Through Cr
2O
3After the polishing, carry out metal spraying on the metallographic specimen surface and handle, like embodiment 1, place then under the JXA-840 type SEM, observe cross-section morphology, and measure coating layer thickness, the result is as shown in Figure 3.
2) choose the aluminium sheet sample of the surface cleaning that has organic coating, constantly drip distilled water to the surface, till the water droplet height no longer increases, keep syringe needle to be in water droplet inside in this process always with syringe.Computing formula according to contact angle:
Wherein, h is the drop maximum height, can measure through the method for taking pictures, and g is an acceleration of gravity, and ρ is the density of water, γ
LgBe the surface tension of water, the numerical value when getting 30 ℃ in the calculating (71.2mN/m).Measurement result shows; Distilled water has reached 116 ° at the contact angle of organic coating layer surface; Near the maximum (120 °) of surface of aluminum plate not being carried out organic coating layer surface pure water contact angle under the micro-nano etching situation; The automatically cleaning effect of this organic coating layer surface is obvious, and water droplet is can tumble automatically more than 20 ° the time and do not stay water stain at the aluminium sheet inclination angle.
The aluminium sheet that 3) will have an organic coating cuts into the sample of 2cm * 6cm size, must guarantee the smooth of Al plate in the tailoring process.Carry out the adhesive force test through the automatic scratching instrument of WS-2002 coating adhesion, the instrument parameter in the measuring process is: test load 90N, loading speed 45N/min; Cut speed 3mm/min, cut length 6mm, experimental result shows; After the hydrating solution of employing gamma-aminopropyl-triethoxy-silane carried out preliminary treatment to aluminium sheet, the adhesive force of coating and aluminium sheet was more than doubled, and in test process; Coating and matrix bond around the cut are good, the phenomenon of not bursting apart.
The aluminium sheet that 4) will have an organic coating cuts into 10cm * 20cm, and guarantees that sample itself is smooth.Test with RC-088 type reflectance test appearance, the result shows that after surface of aluminum plate had applied and adopted the organic coating of the method for the invention preparation, reflecting rate had only reduced by 4%, and the light transmission of this this organic coating of proof is excellent.
5) the Simulated Acid Rain solution of preparation pH=4 drips to the surface of aluminum plate that has organic coating, with beaker sample is covered, and makes it be in air-tight state basically, prevents the evaporation that solution is too fast.When treating that solution on the sample is because of evaporation and reaction approach exhaustion, drip again, write down the dropping situations of the extent of corrosion and the organic coating of sample every day.The result shows, after reaching 168 hours corrosion, organic coating is still intact, and obvious corrosion phenomenon itself does not appear in the Al plate.
6) weatherability of employing thermal shock experimental check coating: the aluminium sheet sample that will have organic coating at first places 95 ℃ hot water; Insulation 10min; Then sample is taken out and put into rapidly in the cold water, take out behind the 10min and put into again in the hot water, so circulate after 20 times; The surface of aluminum plate organic coating is still intact, no obscission.Simultaneously, the aluminium sheet sample that will have organic coating placed outdoor condition following 90 days, and coating does not have obscission.
Claims (1)
1. the preparation method of a transparent organic hydrophobic coating on surface of aluminum plate is characterized in that, may further comprise the steps:
1) cleaning surface of aluminum plate, air dry then;
2) with Y-aminopropyl triethoxysilane and distilled water and absolute ethyl alcohol by volume 2～4: 1～2:40 mixed hydrolysis;
3) said hydrolyzed solution is handled surface of aluminum plate with the showering mode or aluminium sheet is dipped in the hydrating solution handles, this processing procedure keeps 30s～2min, aluminium sheet is placed under 150 ℃～200 ℃ conditions dry 20min～30min then;
4) apply silicone glass resin in above-mentioned treated surface of aluminum plate, and place under 90 ℃～120 ℃ conditions and heat 10min～15min.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010209102 CN101885257B (en) | 2010-06-25 | 2010-06-25 | Method for preparing transparent organic hydrophobic coating on surface of aluminum plate |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010209102 CN101885257B (en) | 2010-06-25 | 2010-06-25 | Method for preparing transparent organic hydrophobic coating on surface of aluminum plate |
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| CN101885257A CN101885257A (en) | 2010-11-17 |
| CN101885257B true CN101885257B (en) | 2012-12-05 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104588288B (en) * | 2013-10-31 | 2017-05-17 | 北新集团建材股份有限公司 | Geil plate surface treatment process |
| JP5724021B1 (en) | 2014-06-25 | 2015-05-27 | アイシン軽金属株式会社 | High alkali-resistant aluminum member and method for producing the same |
| CN108643379B (en) * | 2018-04-27 | 2019-11-12 | 刘孟凡 | A kind of construction heat insulation wall structure |
| CN115338096A (en) * | 2022-08-12 | 2022-11-15 | 山东大学 | Super-hydrophobic layer with long service life, high corrosion resistance and high wear resistance and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1257367A2 (en) * | 2000-02-08 | 2002-11-20 | Adsil, LC | Method for improving heat efficiency using silane coatings and coated articles produced thereby |
| CN1651693A (en) * | 2005-02-07 | 2005-08-10 | 赵建明 | Organic antibacterial coating layer aluminium plate and its preparation method |
| CN101602045A (en) * | 2009-07-09 | 2009-12-16 | 浙江墙煌建材有限公司 | Manufacturing process of color-changing color-coated aluminum plate |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005325440A (en) * | 2004-04-16 | 2005-11-24 | Nippon Steel Corp | Surface-treated metal and method for producing the same |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1257367A2 (en) * | 2000-02-08 | 2002-11-20 | Adsil, LC | Method for improving heat efficiency using silane coatings and coated articles produced thereby |
| CN1651693A (en) * | 2005-02-07 | 2005-08-10 | 赵建明 | Organic antibacterial coating layer aluminium plate and its preparation method |
| CN101602045A (en) * | 2009-07-09 | 2009-12-16 | 浙江墙煌建材有限公司 | Manufacturing process of color-changing color-coated aluminum plate |
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