CN108410216A - A kind of method that soda acid two-step catalysis method is assembled into dense film cladding flake aluminum - Google Patents
A kind of method that soda acid two-step catalysis method is assembled into dense film cladding flake aluminum Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/62—Metallic pigments or fillers
- C09C1/64—Aluminium
- C09C1/642—Aluminium treated with inorganic compounds
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- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
- C09C3/06—Treatment with inorganic compounds
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Abstract
The invention discloses a kind of soda acid two-step catalysis methods to be assembled into the method that dense film coats flake aluminum, can be stabilized under the conditions of higher temperature and relatively low pH by the modified aluminium powder in this method surface.This method is mainly catalyzed ethyl orthosilicate by different catalysts（TEOS）Make its hydrolytic condensation, obtain the silica of different structure, both silica form fine and close silica membrane, it is made to be coated on flake aluminum surface by self assembly.By weighing a certain amount of aluminium powder under pH=1.5, the aqueous conditions that temperature is 80 DEG C, measure its hydrogen-separating quantity number, to weigh the quality of its covering property.The aluminium powder that the present invention is coated, which can meet, transports requirement safely; for the adding ingredient of the coating containing acid-base solution, the surface spraying for ornament is protected, and the aluminium powder after cladding keeps its good glossiness; it can be used for car paint, enhance the aesthetics of car surface.
Description
Technical field
The present invention relates to the methods that a kind of surface of flake aluminum is modified, and in particular to a kind of Flake Aluminum Powder Coated one
The technology of the fine and close silica membrane of layer.
Background technology
Metal aluminium pigment is due to special changeable colors along with angle optical effect and metallic luster, being widely used in automobile painting
In material, industrial coating, printing ink and Plastics Processing Industry.But aluminium is amphiprotic activity metal, is contacted in acid-base solution or air
Oxygen be easy to occur oxidation and blackening, influence its metallic luster, also will produce a large amount of H2, influence its bin stability.It carries
The bin stability of high-alumina fly prevents aluminium powder surface from being aoxidized, and effective method is modified in aluminium powder microparticle surfaces, surface
Adsorb one layer of inert layer of one layer of corrosion inhibitor or microcapsule coated, isolation aluminium and oxygen, water are in direct contact.Compared to absorption
Organic corrosion inhibitor forms one layer of thin and compact passivation layers of chrome or SiO on aluminium powder surface2The inorganic layers such as layer have non-
Often good oxidation and corrosion performance.
Y.Iriyam is with ethyl orthosilicate (TEOS) for presoma, and using plasma polymerization is in aluminium powder particle surface
One layer of SiO is coated2.But its operating process is more complex, technology is more demanding.
Ralf Supplit and Ulrich Schubert carry out first using phosphoric acid catalyzed teos hydrolysis to aluminium powder
Layer cladding, then second layer cladding is carried out with hexadecyl trimethoxy silane or dimethyldimethoxysil,ne hydrolysis, coat aluminium
Powder has preferable stability in the lye of hot water and pH=9, but its raw material is more expensive, and cost is higher.
Liu Hui etc. pre-process aluminium powder using methyl allyl acyloxypropyl trimethoxysilane, then using in situ
The method of emulsion polymerization coats polymethyl methacrylate.Li Lijun etc. has carried out Nano-meter SiO_2 using TEOS to thin slice aluminium powder2Packet
It covers, is hydrolyzed simultaneously using TEOS and vinyltriethoxysilane and the Nano-meter SiO_2 of hydridization has been carried out to aluminium powder2Cladding, and herein
On the basis of second layer cladding carried out using polymer, cladding aluminium powder can be stabilized 30d in the lye of pH=11, after cladding
Aluminium powder does not test its acid resistance at relatively high temperatures.
Jostein Mardalen etc. find coated Si form and coverage degree to coat aluminium powder chemical stability shadow
Sound is more important than the influence of the thickness of coated Si, but does not provide its specific usage.
《Nano-meter SiO_22Coating modification thin slice aluminium powder pigment and its acidproof Journal of Sex Research》For one text using TEOS as presoma, use is molten
Glue-gel method prepares SiO2Aluminium powder pigment (the Al/SiO of cladding2), detailed examination reaction temperature, the reaction time, alumina silica ratio (S=
NAl/nTEOS), water silicon ratio (R=nH2O/n TEOS) and the process conditions such as catalyst amount it is resistance to clad form and product
Acid influence.But use Nano-meter SiO_22The thin slice aluminium powder pigment brightness of coating modification declines, and needs to improve.And aluminium powder face
The corrosion resistance of material, heat resistance, anti-radiation performance, ultra-violet resistance, water resistance, resistance to ag(e)ing, antibiotic property, corrosion resistance, scratch
The performances such as property, stability, thermal diffusivity are also required to further be promoted.
The coated Si O successively on flake aluminum with sol-gel method such as Huang Shuli2And TiO2, investigated solvent dosage, water
The influence in dosage, reaction temperature, reaction time etc. control the thickness of each clad.Experimental study obtains ethyl orthosilicate water
The optimum condition of solution is：TEOS：C2H5OH：H2O：Nit3=1：10：4：Acetamide conduct is added in reaction process by l (molar ratio)
Drying control chemical additive, reaction temperature are 20 DEG C, and the reaction time is 5 hours, and colloidal sol digestion time is one week；Similarly, it obtains
Go out to prepare TiO2Layer optimum condition be：TNB：C2H5OH：H2O=l：10：1 (volume ratio).
It pays adopted equality sol-gel method and coats layer of silicon dioxide film on aluminium powder surface, then use liquid deposition again
Method coats one layer of iron oxide on surface and forms colored aluminium powder.The hydrolyzing condensation of ethyl silicate such as leaf red flag, has probed into hydrolysis
The mechanism of condensation illustrates the catenulate silica of shape after acid catalysis, the webbed titanium dioxide of shape after base catalysis
Silicon.The aluminium powder pigment that ethyl orthosilicate (TEOS) cladding is prepared for using sol-gel method such as Zhao Bolei.It is orthogonal by designing
Experimental study reaction time, reaction temperature, catalyst concn, distillation water concentration and TEOS concentration are to coating aluminium powder acidproof efficiency
Influence, obtain optimum process scheme and to cladding product characterized.The result shows that aluminium powder surface has successfully coated one layer
Coated with silica film.But liberation of hydrogen yield is higher, covered effect is poor.
Horse is good equal under normal pressure with ethyl orthosilicate (TEOS) for source substance, and air is carrier gas and carrier gas, using normal
Pressure chemical vapor deposition method (APCVD) is prepared for SiO in HP40 steel surfaces2 Coating.This kind of deposition method to equipment requirement compared with
Height, deposition process are dangerous.Zheng Huiwen etc. on alumina ceramic substrate with ethyl orthosilicate (TEOS) be raw material, High Purity Nitrogen
Gas makees carrier gas, and SiO is prepared using low pressure cold wallstation and chemical vapor deposition (CVD) method2It is thin.This method is suitable for larger
Substrate surface deposit SiO2, it is not suitable for powder body material, because powder body material be easy to cause reunion in deposition, makes cladding not
Uniformly.
Article name " Improving hydration resistance of Al powder for carbon
The document of containing castables using inorganic-organic hybrid coatings "（Advances
In Applied Ceramics, 2005,104（2）2：79-82）A kind of aluminium powder surface treatment method is provided, by positive silicic acid second
The ethanol solution of ester is added in the solution of polyvinyl alcohol, and with magnetic stirrer strong stirring 30min, it is molten that hydrochloric acid adjusting is added
The pH values of liquid are about 3, and transparent colloidal sol is made, will aluminium powder be added colloidal sol in stir 10min, then with centrifuge by aluminium powder from
It is separated in colloidal sol, dry 4h, is formed on its surface gel at 110 DEG C, obtains the aluminium powder of plural gel cladding, is
SiO2 colloidal sols wrap up.This kind of method easily causes aluminium powder reunion, and covered effect is made to be deteriorated.
Chinese patent is entitled《Organic-inorganic hybrid nanometer film coating aluminum powder pigment and the preparation method and application thereof》's
Chinese invention patent（The patent No.：ZL 200910040162.7）A kind of processing method of aluminium powder is provided, organic-inorganic is utilized
Hybridization technique, using aluminium powder pigment as core, polymerizable carbon-carbon double bond class reactive monomer first with carbon-carbon double bond class organosiloxane
Carry out free radical polymerization, obtained polymer and ethyl orthosilicate by way of hydrolysis with aluminium powder pigment surface bond, in turn
One layer of organic-inorganic hybrid nanometer film is coated on aluminium powder surface.It is characterized in that it is raw materials used for Aluminum Pigment, use SiO2Colloidal sol packet
Wrap up in aluminium powder.Its method is not sufficiently stable at high temperature by Coated with Organic Matter, cannot be compared with purely inorganic object cladding.
The document of article entitled " multilayer coating structure and its performance study on aluminium powder surface "（The 6th science of Chinese Society of Particuology
Annual meeting and both sides of the Straits granule technology seminar, in December, 2008:150-153）A kind of aluminium powder surface treatment method is provided,
Using sol-gel method on flake aluminum coated Si O successively2, optimum condition is：Silester：Absolute ethyl alcohol：Water：
Ammonia=1：10 ：4 ：L (molar ratio), reaction temperature are 20 DEG C, reaction time 5h, and colloidal sol digestion time is 7 days.Its institute
It is flake aluminum with raw material, uses SiO2Colloidal sol wraps up.Silester after ammonia is catalyzed, surface coated silica
It is not fine and close enough, still there is exposed aluminium surface.
Article is entitled《Corrosion resistance of lamellar aluminium pigments coated
by SiO2by sol–gel Method》Document in refer to aluminium powder carrying out multiple coated silica, to reach more
Add fine and close effect.The silicon amount that the aluminium powder surface after repeatedly coating is shown from its article increases, and surface state is uneven
It is whole, there is exposed aluminium powder surface, is the content for the silica for improving aluminium powder surface by acid-base catalysis, this cannot be very
The good corrosion for preventing soda acid or air.This article, which is mentioned, successively to carry out catalysis with hydrochloric acid and ammonium hydroxide and forms coated with silica to exist
Flake aluminum surface, which is the hydrolysis of ethyl orthosilicate and condensation course during controlling acid-base catalysis, by changing
Hydrolysis and the condensation course for becoming ethyl orthosilicate make ethyl orthosilicate form more coated with silica on aluminium powder surface, with
The present invention has the difference of essence, the present invention to form the silica of different structure using soda acid two-step catalysis, and centre passes through drying
The silica of both different structures, the silica synergistic effect self assembly of this different structure are remained on aluminium powder surface
At fine and close silica membrane, to form fine and close smooth silica membrane, to improve its antioxidant anticorrosive and
Glossiness.
By studying above, the method for finding the anti-oxidant and acid and alkali corrosion of flake aluminum mainly coats on aluminium powder surface
One or more layers inorganic or inorganic-organic hybrid substance, due to the stability of silica, wherein applying at most
It is coated with silica aluminium powder.But it is rough by the silica that the flake aluminum surface of coated with silica is formed
It is whole, the main reason is that the silica formed by base catalysis TEOS is mainly at latticed, what acid catalysis TEOS was formed
Silica is chain, no matter the two coats flake aluminum with any catalyst TEOS, can all be deposited on aluminium powder surface
In certain gap, to which hydrogen ion can generate hydrogen with attack aluminium powder surface.
Invention content
The object of the present invention is to provide the technologies for improving existing cladding flake aluminum, and positive silicic acid is catalyzed using different catalysts
Ethyl ester forms silica of different shapes, and wherein what acid catalysis was formed is the silica of chain, and base catalysis shape is webbed
Silica, there is larger gap in both regardless of catalytic way, in the clad that surface is formed.The present invention will
The silica of both forms is assembled into fine and close silica membrane, i.e., the dioxy for netted silica being passed through chain
SiClx is filled, and will be assembled into fine and close silica membrane, is coated on flake aluminum surface, to improve its surface coating rate, drop
Low its coats voidage, the exposed of aluminium powder surface is prevented, so as to prevent hydrionic attack.
The purpose of the present invention can be realized by following technique measures：
1. being catalyzed ethyl orthosilicate with different catalysts, makes hydrolyzing condensation of ethyl silicate, obtain the sheet dioxy of different structure
SiClx is self-assembled into fine and close silica membrane by the silica of different structure, is coated on flake aluminum surface.
2. the grain size of flake aluminum described in is 10~20 μm, and surface is smooth, alumina-free film.
3. catalyst described in is bronsted lowry acids and bases bronsted lowry, wherein acid is hydrochloric acid, alkali is ammonium hydroxide.
4. ethyl orthosilicate described in is to be dissolved in alcohol solvent to contact with water phase, and water is carried out under conditions of catalyst
Solution and condensation reaction.
5. flake aluminum described in is immersed in organic matter grease when being not used and protects, by the washing of acetone by aluminium when use
The grease on powder surface washes away, then is coated with washed aluminium powder.
6. method for coating described in is first to use acid catalysis ethyl orthosilicate, and layer of silicon dioxide is coated on aluminium powder surface, will
The aluminium powder drying coated, then base catalysis ethyl orthosilicate is used, so that it is coated layer of silicon dioxide again on aluminium powder surface, thus shape
At the silica membrane of assembling.
7. specific cladding process includes the following steps：
1. taking surface smooth, the flake aluminum of alumina-free film is washed 3 ~ 4 times with acetone, and the stearic pickling on aluminium powder surface is done
Only, the cladding for being conducive to silica below enhances its surface coating rate, is then added in beaker, and ethanol solution dispersion is added
Aluminium powder, ethyl alcohol account for the 250% ~ 380% of aluminium powder quality, add ethyl orthosilicate and water, and the quality of ethyl orthosilicate accounts for aluminium powder matter
The 30 ~ 50% of amount, the quality of water is 0.3 ~ 0.8 times of aluminium powder quality, is eventually adding the dilute hydrochloric acid for accounting for aluminium powder quality 1% ~ 4%（Concentration
For 3 ~ 8wt%）Catalyst is made, reaction a period of time, is cleaned with ethyl alcohol, it is 4 ~ 6 hours dry at 80 ~ 100 DEG C；
2. after the cladding aluminium powder that acid is done to catalyst is dried, it is added in beaker, the ethyl alcohol of aluminium powder quality 250% ~ 380% is added
Solution disperses, and adds the water of 0.1 ~ 0.5 times of the ethyl orthosilicate and aluminium powder quality of aluminium powder quality 20% ~ 40%, is eventually adding ammonia
Water（23 ~ 28wt% of concentration）Catalyst is made, the amount of ammonium hydroxide is the 2% ~ 3.5% of aluminium powder quality, reaction a period of time, is carried out with ethyl alcohol
Cleaning, it is 4 ~ 6 hours dry at 80 ~ 100 DEG C, the aluminium powder of double-coating is made.
Aluminium powder surface often uses stearic acid as protective agent, prevents aluminium powder surface from being aoxidized, with acetone by aluminium powder surface
Stearic acid wash away, be conducive to silica and be deposited on aluminium powder surface, ethyl alcohol mainly plays dispersion and medium, Jiang Shui and positive silicon
Acetoacetic ester connects, to react.Second alcohol and water will excessively prevent the progress of reaction as reaction product simultaneously,
Reduce the generation of its silica.Soda acid can accelerate the progress of reaction, but the amount of catalyst is excessive, meeting as catalyst
The surface gloss of aluminium powder is destroyed, simultaneous reactions are too fast, it will so that silica is drifted in solution, cannot be deposited on aluminium powder
Surface.
Beneficial effects of the present invention are as follows：
1, the present invention is easy to operate, can be carried out at normal temperatures, and raw material is cheap, and covered effect is good, is avoided that single layer coats
Defect.
2, the present invention makes it form compact silicon dioxide film on aluminium powder surface by the method for self assembly, after making cladding
Aluminium powder can be stabilized under strongly acidic conditions.
3, the aluminium powder after present invention cladding is suitable for carrying out secondary coated iron oxide, titanium oxide, the oxidation of the metals such as chromium oxide
Object manufactures color pigment aluminium powder.
Description of the drawings
Fig. 1 is the electromicroscopic photograph of the flake aluminum after cladding；
Fig. 2 is that the liberation of hydrogen of different cladding modes is tested, including base catalysis cladding, acid catalysis coat, the aluminium powder of acid-base catalysis cladding.
Specific implementation mode
Embodiment 1
Aluminum paste is cleaned up with acetone, 3 grams of aluminium powders is weighed, is added in beaker, 10ml ethyl alcohol is added and is disperseed
1g ethyl orthosilicates are added in aluminium powder, and 1ml deionized waters are added, are eventually adding the dilute hydrochloric acid of 0.1ml 5wt% as catalyst.With
Magnetic stirring apparatus is stirred, and is reacted 30 hours.The aluminium powder after reaction is rinsed with ethyl alcohol, 6 are dried at 100 DEG C
Hour.Dried aluminium powder is weighed 3 grams in beaker, 10ml ethyl alcohol is added, is disperseed, 1g ethyl orthosilicates are added, add
Enter 0.5ml water, be eventually adding the concentrated ammonia liquor of 0.1ml 25wt%, be stirred with magnetic stirring apparatus, after reacting 15 hours, uses second
Alcohol is rinsed, and the aluminium powder after flushing is 6 hours dry at 100 DEG C.Final cladding aluminium powder is made.
The aluminium powder finally coated is tested under pH=1.5, the aqueous solution that temperature is 80 DEG C, is generated without hydrogen.
Embodiment 2
Aluminum paste is cleaned up with acetone, 6 grams of aluminium powders is weighed, is added in beaker, 20ml ethyl alcohol is added and is disperseed
2g ethyl orthosilicates are added in aluminium powder, and 2ml deionized waters are added, are eventually adding the dilute hydrochloric acid of 0.1ml 5wt% as catalyst.With
Magnetic stirring apparatus is stirred, and is reacted 30 hours.The aluminium powder after reaction is rinsed with ethyl alcohol, 6 are dried at 100 DEG C
Hour.Dried aluminium powder is weighed 6 grams in beaker, 20ml ethyl alcohol is added, is disperseed, 2g ethyl orthosilicates are added, add
Enter 1ml water, be eventually adding the concentrated ammonia liquor of 0.2ml 23wt%, be stirred with magnetic stirring apparatus, after reacting 15 hours, uses ethyl alcohol
It is rinsed, the aluminium powder after flushing is 6 hours dry at 100 DEG C.Final cladding aluminium powder is made.
The aluminium powder finally coated is tested under pH=1.5, the aqueous solution that temperature is 80 DEG C, is generated without hydrogen.
Embodiment 3
Aluminum paste is cleaned up with acetone, 10 grams of aluminium powders is weighed, is added in beaker, 30ml ethyl alcohol is added and is disperseed
3ml ethyl orthosilicates are added in aluminium powder, and 3ml deionized waters are added, are eventually adding the dilute hydrochloric acid of 0.1ml 7wt% as catalyst.
It is stirred, is reacted 30 hours with magnetic stirring apparatus.The aluminium powder after reaction is rinsed with ethyl alcohol, is done at 100 DEG C
Dry 6 hours.Dried aluminium powder is weighed 10 grams in beaker, 30ml ethyl alcohol is added, is disperseed, the positive silicic acid second of 3ml is added
Ester is added 1.5ml water, is eventually adding the concentrated ammonia liquor of 1ml 23wt%, is stirred with magnetic stirring apparatus, after reacting 15 hours, uses
Ethyl alcohol is rinsed, and the aluminium powder after flushing is 6 hours dry at 100 DEG C.Final cladding aluminium powder is made.
The aluminium powder finally coated is tested under pH=1.5, the aqueous solution that temperature is 80 DEG C, is generated without hydrogen.
Embodiment 4
Aluminum paste is cleaned up with acetone, 20 grams of aluminium powders is weighed, is added in beaker, 60ml ethyl alcohol is added and is disperseed
6ml ethyl orthosilicates are added in aluminium powder, and 6ml deionized waters are added, are eventually adding the dilute hydrochloric acid of 0.02ml 8wt% as catalyst.
It is stirred, is reacted 30 hours with magnetic stirring apparatus.The aluminium powder after reaction is rinsed with ethyl alcohol, is done at 100 DEG C
Dry 6 hours.Dried aluminium powder is weighed 20 grams in beaker, 60ml ethyl alcohol is added, is disperseed, the positive silicic acid second of 6ml is added
Ester is added 3ml water, is eventually adding the concentrated ammonia liquor of 1.5ml 28wt%, is stirred with magnetic stirring apparatus, after reacting 15 hours, uses
Ethyl alcohol is rinsed, and the aluminium powder after flushing is 6 hours dry at 100 DEG C.Final cladding aluminium powder is made.
The aluminium powder finally coated is tested under pH=1.5, the aqueous solution that temperature is 80 DEG C, is generated without hydrogen.
Fig. 1 be soda acid two-step catalysis be self-assembled into compact silicon dioxide film coated flake aluminum surface electromicroscopic photograph
Figure.As can be seen from the figure it is catalyzed the film to form the different Nano particles of silicon dioxide self assembly of structure by different catalysts
Fine and close smooth, the surface so as to be effectively protected aluminium powder is not oxidized and corrosion, and can preferable reflection light, from
And improve the flasher characteristic of aluminium powder.Fig. 2 is the liberation of hydrogen test of the corrosion resistance of aluminium powder, and by aluminium powder as pH=1.5, temperature is
In 80 DEG C of conical flask, it is hydrogen output to collect displacement, and displacement is more, shows that the corrosion resistance of aluminium powder is poorer.From Fig. 2
In as can be seen that either acid or alkali are individually catalyzed the flake aluminum of cladding, can all generate hydrogen, illustrate its corrosion resistance compared with
Difference, but the flake aluminum of the silica membrane cladding Jing Guo self assembly, displacement zero illustrate to coat by this method
Flake aluminum afterwards can have extraordinary corrosion resistance, so as to greatly improve its actual application value.
The foregoing is merely presently preferred embodiments of the present invention, all equivalent changes done according to scope of the present invention patent with
Modification should all belong to the covering scope of the present invention.
Claims (8)
1. a kind of method that soda acid two-step catalysis method is assembled into dense film cladding flake aluminum, which is characterized in that with acid, alkali two
Kind catalyst ethyl orthosilicate, makes hydrolyzing condensation of ethyl silicate, the flaky silicon dioxide of different structure is obtained, by not
Isostructural silica is self-assembled into fine and close silica membrane, is coated on flake aluminum surface.
2. the method that a kind of soda acid two-step catalysis method according to claim 1 is assembled into dense film cladding flake aluminum,
It is characterized in that, the grain size of the flake aluminum is 10~20 μm, surface is smooth, alumina-free film.
3. the method that a kind of soda acid two-step catalysis method according to claim 1 is assembled into dense film cladding flake aluminum,
It is characterized in that, the acid catalyst is hydrochloric acid, base catalyst is ammonium hydroxide.
4. the method that a kind of soda acid two-step catalysis method according to claim 1 is assembled into dense film cladding flake aluminum,
It is characterized in that, the ethyl orthosilicate is dissolved in alcohol solvent and is contacted with water phase, water is carried out under conditions of catalyst
Solution and condensation reaction.
5. a kind of soda acid two-step catalysis method according to claim 1 or 2 is assembled into the side of dense film cladding flake aluminum
Method, which is characterized in that the flake aluminum is immersed in organic matter grease when being not used and protects, and passes through the washing of acetone when use
The grease on aluminium powder surface is washed away, then is coated with washed aluminium powder.
6. the method that a kind of soda acid two-step catalysis method according to claim 1 is assembled into dense film cladding flake aluminum,
It is characterized in that, the method for coating is first to use acid catalysis ethyl orthosilicate, layer of silicon dioxide is coated on aluminium powder surface, it will
The aluminium powder drying coated, then base catalysis ethyl orthosilicate is used, so that it is coated layer of silicon dioxide again on aluminium powder surface, thus shape
At the silica membrane of assembling.
7. a kind of soda acid two-step catalysis method according to claim 1 or 6 is assembled into the side of dense film cladding flake aluminum
Method, which is characterized in that include the following steps：
1. taking surface smooth, the flake aluminum of alumina-free film is washed 3 ~ 4 times with acetone, and the stearic pickling on aluminium powder surface is done
Only, the cladding for being conducive to silica below enhances its surface coating rate, is then added in beaker, and ethanol solution dispersion is added
Aluminium powder, ethyl alcohol account for the 250% ~ 380% of aluminium powder quality, add ethyl orthosilicate and water, and the quality of ethyl orthosilicate accounts for aluminium powder matter
The 30 ~ 50% of amount, the quality of water is 0.3 ~ 0.8 times of aluminium powder quality, is eventually adding and accounts for the dilute hydrochloric acid of aluminium powder quality 1% ~ 4% and urge
Agent, is cleaned at reaction a period of time with ethyl alcohol, 4 ~ 6 hours dry at 80 ~ 100 DEG C；
2. after the cladding aluminium powder that acid is done to catalyst is dried, it is added in beaker, the ethyl alcohol of aluminium powder quality 250% ~ 380% is added
Solution disperses, and adds the water of 0.1 ~ 0.5 times of the ethyl orthosilicate and aluminium powder quality of aluminium powder quality 20% ~ 40%, is eventually adding ammonia
Water makees catalyst, and the amount of ammonium hydroxide is the 2% ~ 3.5% of aluminium powder quality, reaction a period of time, is cleaned with ethyl alcohol, at 80 ~ 100 DEG C
The aluminium powder of double-coating is made in lower drying 4 ~ 6 hours.
8. the method that a kind of soda acid two-step catalysis method according to claim 7 is assembled into dense film cladding flake aluminum,
It is characterized in that, a concentration of 3 ~ 8wt% of dilute hydrochloric acid, a concentration of 23 ~ 28wt% of ammonium hydroxide.
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| CN110396307A (en) * | 2019-06-20 | 2019-11-01 | 山东盈科新型材料科技有限公司 | A kind of aluminum paste pigment preparation method |
| CN110878178A (en) * | 2019-12-18 | 2020-03-13 | 河南兴安新型建筑材料有限公司 | Nano SiO2Film-coated flaky aluminum pigment and preparation method thereof |
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| CN111100484A (en) * | 2019-12-27 | 2020-05-05 | 河南兴安新型建筑材料有限公司 | Nano SiO2Preparation method of coated flaky pigment Al powder |
| CN113292837A (en) * | 2021-06-07 | 2021-08-24 | 广东顾纳凯材料科技有限公司 | Metal appearance imitation master batch, preparation method thereof and polyolefin composite material |
| CN115011143A (en) * | 2022-06-27 | 2022-09-06 | 广州融捷显示科技有限公司 | Silicon dioxide coating layer and preparation method thereof |
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| CN110981283A (en) * | 2019-12-18 | 2020-04-10 | 河南兴安新型建筑材料有限公司 | Environment-friendly metallic permeable pavement material |
| CN110981283B (en) * | 2019-12-18 | 2022-03-15 | 河南兴安新型建筑材料有限公司 | Environment-friendly metallic permeable pavement material |
| CN111100484A (en) * | 2019-12-27 | 2020-05-05 | 河南兴安新型建筑材料有限公司 | Nano SiO2Preparation method of coated flaky pigment Al powder |
| CN113292837A (en) * | 2021-06-07 | 2021-08-24 | 广东顾纳凯材料科技有限公司 | Metal appearance imitation master batch, preparation method thereof and polyolefin composite material |
| CN113292837B (en) * | 2021-06-07 | 2023-03-10 | 广东顾纳凯材料科技有限公司 | Metal appearance imitation master batch, preparation method thereof and polyolefin composite material |
| CN115011143A (en) * | 2022-06-27 | 2022-09-06 | 广州融捷显示科技有限公司 | Silicon dioxide coating layer and preparation method thereof |
| CN115321946A (en) * | 2022-07-22 | 2022-11-11 | 安徽瑞泰新材料科技有限公司 | Long-life low-cost refractory castable and preparation method thereof |
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