CN102585695B - Flexible coating for aluminum alloy and preparation method of flexible coating - Google Patents
Flexible coating for aluminum alloy and preparation method of flexible coating Download PDFInfo
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- CN102585695B CN102585695B CN201110447756.7A CN201110447756A CN102585695B CN 102585695 B CN102585695 B CN 102585695B CN 201110447756 A CN201110447756 A CN 201110447756A CN 102585695 B CN102585695 B CN 102585695B
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Abstract
The invention discloses a flexible coating for aluminum alloy and a preparation method of the flexible coating. The flexible coating comprises the following materials by weight percent: 10 to 20 percent of silicic acid compound, and 15 to 25 percent of organic silicon resin. The preparation method comprises the following steps: (1) weighing certain quantities of silicic acid compound liquor, deionized water and anhydrous ethyl alcohol, pouring the silicic acid compound liquor, the deionized water and the anhydrous ethyl alcohol into a beaker, stirring for 20 min under magnetic force, adjusting the PH valve with concentrated hydrochloric acid, and then stirring for 3 h till the mixture is completely hydrolyzed; (2) weighing 100 g of the mixture in the step (1), placing the 100 g of the mixture into a constant-temperature water bath kettle, heating, stirring, adding organic silicon resin, deionized water, solvent and flatting agent which are weighed into the mixture sequentially, and carrying out hydrolytic condensation reaction; and (3) preparing a layer of film on the surface of aluminum alloy by utilizing the mixture obtained in the step (2), airing at ordinary temperature for 10 min, and curing at 200 DEG C constant temperature for 30 min so as to obtain the flexible coating. The coating has the performances of scratching resistance, corrosion resistance, flexibility and the like, and is transparent so as not to impact the metal texture of aluminum alloy.
Description
Technical field
The present invention relates to a kind of aluminium alloy coating, specifically a kind of flexible coating for aluminium alloy and preparation method thereof.
Background technology
Aluminium alloy, due to features such as quality is light, metal sense is strong, easy-formation processing, is widely used in the decoration such as household electrical appliances and consumer electronics field.This is easily corroded aluminium in air, causes its surface blackening and produces spot.Traditional guard method is to adopt anode oxidation process, and at aluminium Surface Creation layer oxide film, erosion resistance, the scoring resistance of this film are all better.
Household electrical appliances and electronic product shape are various, and some product needed are prepared by punching press, therefore need aluminium alloy and protective layer thereof to have certain snappiness.And the main component of conventional anodization film is aluminum oxide, hardness is higher, and therefore fragmentation easy to crack in punching course needs to adopt additive method to carry out aluminium sheet protection.For some high-end specular aluminium industries, higher to the requirement of coating.In order not destroy the metal sense of specular aluminium, coating should be transparent color, has therefore limited the use of some flexible additives.
Through the retrieval to prior art, Chinese invention patent: a kind of preparation method of transparent organic hydrophobic coating on surface of aluminum plate, application number: 201010209102.6, the disclosed coating of this patent can effectively be resisted the corrosion of acidic solution, aluminium sheet is had to very high sticking power, when by aluminium sheet doubling, still do not ftracture, come off, the transmittance of coating reaches 96% in addition.But this material belongs to organic materials, and hardness is lower, and weathering resistance is poor, and along with the prolongation of duration of service, coating can be turned to be yellow and be become fragile.In order to make product there is longer work-ing life, should select a kind of high performance coating to protect aluminium alloy.
Summary of the invention
The object of the invention is to solve above-mentioned deficiency of the prior art, a kind of flexible coating for aluminium alloy and preparation method thereof be provided, this coating not only erosion resistance and scratch resistance good, and can be bent arbitrarily, strike out different shape.
The present invention is achieved by the following technical solutions:
For a flexible coating for aluminium alloy, comprise silicate compound and silicone resin, wherein, the mass percent that described silicate compound accounts for total system is 10-20%, the mass percent that described silicone resin accounts for total system is 15-25%.
For a preparation method for the flexible coating of aluminium alloy, it is characterized in that, comprise the steps:
(1) take a certain amount of silicate compound solution, deionized water and dehydrated alcohol, pour beaker into, magnetic agitation 20min, regulates pH value with concentrated hydrochloric acid, continues to stir 3h it is fully hydrolyzed;
(2) take the mixture that 100g step (1) prepares, put into thermostat water bath heated and stirred, more load weighted silicone resin, deionized water, solvent and flow agent are poured into wherein successively, condensation reaction is hydrolyzed;
(3) said mixture that utilizes step (2) to obtain, prepares a skim in aluminum alloy surface, and normal temperature dries after 10min, solidifies 30min under the constant temperature of 200 ℃, obtains described flexible coating.
Described silicate compound comprises a kind of in methyl silicate and tetraethoxy or both proportioning things.
Described silicone resin comprises one or more the proportioning thing in Y-aminopropyl triethoxysilane, methyltrimethoxy silane, Y-(methacryloxypropyl) propyl trimethoxy silicane and poly-Union carbide A-162.
The quality of described step (1) mesosilicic acid compound solution, deionized water and dehydrated alcohol is respectively 70-140g, 110-150g and 100-130g.
In described step (1), pH value is 5-6.
Solvent in described step (2) is one or more in Virahol, ethanol, butyl ester, butanone and propylene glycol monomethyl ether.
In described step (2), the quality of silicone resin, deionized water, solvent and flow agent is respectively 30-50g, 20-30g, 25-35g and 5g.
The method of preparing film in described step (3) comprises dip-coating method, spin-coating method and spraying method.
Described step (3) adopts dip-coating method, prepares a skim with the pull rate of 5mm/s in aluminum alloy surface.
Described step (3) adopts spin-coating method at aluminium alloy plate surface coatings, and spin speed is 800r/min, and the time is 60s.
Described step (3) adopts spraying method, prepares a skim in aluminum alloy surface.
Compared with prior art, superiority of the present invention and beneficial effect are, can improve the oxide film fragility problem of conventional anodization processing, give aluminium snappiness, can arbitrarily bend punching press; The performance such as erosion resistance, scoring resistance of this coating is all very excellent, and is transparent color, does not affect the apparent effect of aluminium.
Embodiment
Below embodiments of the invention are elaborated: the present embodiment is implemented under take technical solution of the present invention as prerequisite, provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
Embodiment 1
The present embodiment provides a kind of flexible coating for aluminium alloy, comprises silicate compound and silicone resin, and wherein, the mass percent that silicate compound accounts for total system is 10-20%, and the mass percent that silicone resin accounts for total system is 15-25%.Wherein, silicate compound comprises a kind of in methyl silicate and tetraethoxy or both proportioning things; Silicone resin comprises one or more the proportioning thing in Y-aminopropyl triethoxysilane, methyltrimethoxy silane, Y-(methacryloxypropyl) propyl trimethoxy silicane and poly-Union carbide A-162.
Following examples are the embodiment of the method for embodiment 1, comprise the steps:
(1) take a certain amount of silicate compound solution, deionized water and dehydrated alcohol, pour beaker into, magnetic agitation 20min, regulates pH value with concentrated hydrochloric acid, continues to stir 3h it is fully hydrolyzed;
(2) take the mixture that 100g step (1) prepares, put into thermostat water bath heated and stirred, more load weighted silicone resin, deionized water, solvent and flow agent are poured into wherein successively, condensation reaction is hydrolyzed;
(3) said mixture that utilizes step (2) to obtain, prepares a skim in aluminum alloy surface, and normal temperature dries after 10min, solidifies 30min under the constant temperature of 200 ℃, obtains described flexible coating.
Be specially:
Embodiment 2
Take 100g teos solution, 130g deionized water and 120g dehydrated alcohol, pour beaker into, magnetic agitation 20min.With concentrated hydrochloric acid adjusting pH value to 5, continue to stir 3h and make its hydrolysis; Take the mixture of 100g, put into thermostat water bath heated and stirred, then 30gY-aminopropyl triethoxysilane, 30g deionized water, 35g Virahol, 5g flow agent are poured into wherein successively, condensation reaction is hydrolyzed; Utilize the mixture of above-mentioned preparation, adopt dip-coating method technique, prepare a skim with the pull rate of 5mm/s in aluminum alloy surface.Normal temperature is placed after 10min, solidifies 30min under the constant temperature of 200 ℃, obtains described flexible coating.
Prepared coating does not ftracture in the bending test of 90 °, and hardness is 3H, and surface has sends out color phenomenon, and coatingsurface has more pin-hole phenomena, resistance to cupric ion acceleration salt-fog test 80h.
Embodiment 3
Take 100g teos solution, 130g deionized water and 120g dehydrated alcohol, pour beaker into, magnetic agitation 20min.With concentrated hydrochloric acid adjusting pH value to 5, continue to stir 3h and make its hydrolysis; Take the mixture of 100g, put into thermostat water bath heated and stirred, then 50gY-aminopropyl triethoxysilane, 20g deionized water, 25g Virahol, 5g flow agent are poured into wherein successively, condensation reaction is hydrolyzed; Utilize the mixture of above-mentioned preparation, adopt dip-coating method technique, prepare a skim with the pull rate of 5mm/s in aluminum alloy surface.Normal temperature is placed after 10min, solidifies 30min under the constant temperature of 200 ℃, obtains described flexible coating.
Prepared coating does not ftracture in the bending test of 90 °, and hardness is 3H, the acomia color phenomenon in surface, and coatingsurface has few pin-hole phenomena, and resistance to cupric ion accelerates salt-fog test 73h.
Embodiment 4
Take 140g teos solution, 110g deionized water and 100g dehydrated alcohol, pour beaker into, magnetic agitation 20min.With concentrated hydrochloric acid adjusting pH value to 5, continue to stir 3h and make its hydrolysis; Take the mixture of 100g, put into thermostat water bath heated and stirred, then 40gY-aminopropyl triethoxysilane, 25g deionized water, 30 Virahols, 5g flow agent are poured into wherein successively, condensation reaction is hydrolyzed; Utilize the mixture of above-mentioned preparation, adopt dip-coating method technique, prepare a skim with the pull rate of 5mm/s in aluminum alloy surface.Normal temperature is placed after 10min, solidifies 30min under the constant temperature of 200 ℃, obtains described flexible coating.
Prepared coating is cracking in the bending test of 90 °, and hardness is 4H, the acomia color phenomenon in surface, and coatingsurface has trickle pin-hole phenomena, and resistance to cupric ion accelerates salt-fog test 95h.
Embodiment 5
Take 70g teos solution, 150g deionized water and 130g dehydrated alcohol, pour beaker into, magnetic agitation 20min.With concentrated hydrochloric acid adjusting pH value to 6, continue to stir 3h and make its hydrolysis; Take the mixture of 100g, put into thermostat water bath heated and stirred, then 40gY-aminopropyl triethoxysilane, 25g deionized water, 30 Virahols, 5g flow agent are poured into wherein successively, the condensation reaction that is hydrolyzed, is prepared into hybrid collosol; Adopt spin-coating method at aluminium alloy plate surface coatings, spin speed is 800r/min, and the time is 60s.After spin coating finishes, normal temperature is placed 10min, then under the constant temperature of 200 ℃, solidifies 30min, obtains described flexible coating.
Prepared coating does not ftracture in the bending test of 90 °, and hardness is 2H, the acomia color phenomenon in surface, and the pin-hole phenomena that coatingsurface is more, resistance to cupric ion accelerates salt-fog test 70h.
Embodiment 6
Take 140g teos solution, 110g deionized water and 100g dehydrated alcohol, pour beaker into, magnetic agitation 20min.With concentrated hydrochloric acid adjusting pH value to 5, continue to stir 3h and make its hydrolysis; Take the mixture of 100g, put into thermostat water bath heated and stirred, then 50gY-aminopropyl triethoxysilane, 20g deionized water, 25g Virahol, 5g flow agent are poured into wherein successively, condensation reaction is hydrolyzed; Utilize the mixture of above-mentioned preparation, adopt dip-coating method technique, prepare a skim with the pull rate of 5mm/s in aluminum alloy surface.Normal temperature is placed after 10min, solidifies 30min under the constant temperature of 200 ℃, obtains described flexible coating.
Prepared coating does not ftracture in the bending test of 90 °, and hardness is 3H, the acomia color phenomenon in surface, and coatingsurface has few pin-hole phenomena, and resistance to cupric ion accelerates salt-fog test 100h.
Embodiment 7
Take 100g methyl silicate solution, 130g deionized water and 120g dehydrated alcohol, pour beaker into, magnetic agitation 20min.With concentrated hydrochloric acid adjusting pH value to 5, continue to stir 3h and make its hydrolysis; Take the mixture of 100g, put into thermostat water bath heated and stirred, then 50gY-aminopropyl triethoxysilane, 20g deionized water, 25g propylene glycol monomethyl ether, 5g flow agent are poured into wherein successively, condensation reaction is hydrolyzed; Utilize the mixture of above-mentioned preparation, adopt dip-coating method technique, prepare a skim with the pull rate of 5mm/s in aluminum alloy surface.Normal temperature is placed after 10min, solidifies 30min under the constant temperature of 200 ℃, obtains described flexible coating.
Prepared coating does not ftracture in the bending test of 90 °, and hardness is 3H, the acomia color phenomenon in surface, and coatingsurface has few pin-hole phenomena, and resistance to cupric ion accelerates salt-fog test 70h.
Embodiment 8
Take 100g methyl silicate solution, 130g deionized water and 120g dehydrated alcohol, pour beaker into, magnetic agitation 20min.With concentrated hydrochloric acid adjusting pH value to 5, continue to stir 3h and make its hydrolysis; Take the mixture of 100g, put into thermostat water bath heated and stirred, more poly-30g Union carbide A-162,30g deionized water, 35g butyl ester, 5g flow agent are poured into wherein successively, condensation reaction is hydrolyzed; Utilize the mixture of above-mentioned preparation, adopt spraying coating process, prepare a skim in aluminum alloy surface.Normal temperature is placed after 10min, solidifies 30min under the constant temperature of 200 ℃, obtains described flexible coating.
Prepared coating does not ftracture in the bending test of 90 °, and hardness is 3H, the acomia color phenomenon in surface, and coatingsurface has more pin-hole phenomena, and resistance to cupric ion accelerates salt-fog test 80h.
Embodiment 9
Take 140g teos solution, 110g deionized water and 100g dehydrated alcohol, pour beaker into, magnetic agitation 20min.With concentrated hydrochloric acid adjusting pH value to 5, continue to stir 3h and make its hydrolysis; Take the mixture of 100g, put into thermostat water bath heated and stirred, more poly-50g Union carbide A-162,20g deionized water, 25g Virahol, 5g flow agent are poured into wherein successively, condensation reaction is hydrolyzed; Utilize the mixture of above-mentioned preparation, adopt dip-coating method technique, prepare a skim with the pull rate of 5mm/s in aluminum alloy surface.Normal temperature is placed after 10min, solidifies 30min under the constant temperature of 200 ℃, obtains described flexible coating.
Prepared coating does not ftracture in the bending test of 90 °, and hardness is 3H, the acomia color phenomenon in surface, and coatingsurface has few pin-hole phenomena, and resistance to cupric ion accelerates salt-fog test 100h.
Comprehensive above-described embodiment, the over-all properties optimums such as the snappiness of embodiment 9, apparent effect and corrosion resistance nature.
Scope of the present invention is not subject to the restriction of described specific embodiments, and described embodiment, only as the single example of illustrating all respects of the present invention, also comprises method and the component of functional equivalent in the scope of the invention.In fact,, except content as herein described, those skilled in the art can easily grasp multiple improvement of the present invention with reference to description above.Within described improvement also falls into the scope of appended claims.
Claims (6)
1. for a preparation method for the flexible coating of aluminium alloy, it is characterized in that, comprise the steps:
(1) take a certain amount of silicate compound solution, deionized water and dehydrated alcohol, pour beaker into, magnetic agitation 20min, by concentrated hydrochloric acid adjusting pH value, continues to stir 3h it is fully hydrolyzed;
(2) take the mixture that 100g step (1) prepares, put into thermostat water bath heated and stirred, more load weighted silicone resin, deionized water, solvent and flow agent are poured into wherein successively, condensation reaction is hydrolyzed;
(3) said mixture that utilizes step (2) to obtain, prepares a skim in aluminum alloy surface, and normal temperature dries after 10min, solidifies 30min under the constant temperature of 200 ℃, obtains described flexible coating;
Described flexible coating comprises silicate compound and silicone resin, and wherein, the mass percent that described silicate compound accounts for total system is 10-20%, and the mass percent that described silicone resin accounts for total system is 15-25%;
Described silicate compound comprises a kind of in methyl silicate and tetraethoxy or both proportioning things;
Described silicone resin comprises one or more the proportioning thing in γ-aminopropyl triethoxysilane, methyltrimethoxy silane, γ-(methacryloxypropyl) propyl trimethoxy silicane and poly-Union carbide A-162;
In described step (1), pH value is 5-6;
The quality of described step (1) mesosilicic acid compound solution, deionized water and dehydrated alcohol is respectively 70-140g, 110-150g and 100-130g;
In described step (2), the quality of silicone resin, deionized water, solvent and flow agent is respectively 30-50g, 20-30g, 25-35g and 5g.
2. the preparation method of the flexible coating for aluminium alloy according to claim 1, is characterized in that, the solvent in described step (2) is one or more in Virahol, ethanol, butyl ester, butanone and propylene glycol monomethyl ether.
3. the preparation method of the flexible coating for aluminium alloy according to claim 1, is characterized in that, the method for preparing film in described step (3) comprises dip-coating method, spin-coating method and spraying method.
4. the preparation method of the flexible coating for aluminium alloy according to claim 3, is characterized in that, described step (3) adopts dip-coating method, prepares a skim with the pull rate of 5mm/s in aluminum alloy surface.
5. the preparation method of the flexible coating for aluminium alloy according to claim 3, is characterized in that, described step (3) adopts spin-coating method at aluminium alloy plate surface coatings, and spin speed is 800r/min, and the time is 60s.
6. the preparation method of the flexible coating for aluminium alloy according to claim 3, is characterized in that, described step (3) adopts spraying method, prepares a skim in aluminum alloy surface.
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| CN101020750A (en) * | 2007-03-16 | 2007-08-22 | 西北工业大学 | Silicone antifoulant and its prepn |
| CN101037567A (en) * | 2007-04-10 | 2007-09-19 | 浙江大学 | Composite silicon coating and its preparing method |
| CN101429355A (en) * | 2007-11-08 | 2009-05-13 | 深圳大学 | Process for preparing nano-organosilicon composite coating |
| CN101805531A (en) * | 2010-02-23 | 2010-08-18 | 浙江大学 | Preparation method of organic-inorganic composite collosol for the surface corrosion prevention of metal aluminum sheet |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101020750A (en) * | 2007-03-16 | 2007-08-22 | 西北工业大学 | Silicone antifoulant and its prepn |
| CN101037567A (en) * | 2007-04-10 | 2007-09-19 | 浙江大学 | Composite silicon coating and its preparing method |
| CN101429355A (en) * | 2007-11-08 | 2009-05-13 | 深圳大学 | Process for preparing nano-organosilicon composite coating |
| CN101805531A (en) * | 2010-02-23 | 2010-08-18 | 浙江大学 | Preparation method of organic-inorganic composite collosol for the surface corrosion prevention of metal aluminum sheet |
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