CN112796506A - Preparation method of high-strength easy-demoulding aluminum alloy template - Google Patents
Preparation method of high-strength easy-demoulding aluminum alloy template Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G9/00—Forming or shuttering elements for general use
- E04G9/02—Forming boards or similar elements
- E04G9/06—Forming boards or similar elements the form surface being of metal
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
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- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M177/00—Special methods of preparation of lubricating compositions; Chemical modification by after-treatment of components or of the whole of a lubricating composition, not covered by other classes
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- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
- C10M2201/04—Elements
- C10M2201/041—Carbon; Graphite; Carbon black
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- C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
- C10M2201/08—Inorganic acids or salts thereof
- C10M2201/084—Inorganic acids or salts thereof containing sulfur, selenium or tellurium
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
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- C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
- C10M2201/10—Compounds containing silicon
- C10M2201/105—Silica
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- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
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- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/10—Carboxylix acids; Neutral salts thereof
- C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
- C10M2207/125—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
- C10M2207/126—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids monocarboxylic
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- C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
- C10M2209/02—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C10M2209/04—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to an alcohol or ester thereof; bound to an aldehyde, ketonic, ether, ketal or acetal radical
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- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
- C10M2209/12—Polysaccharides, e.g. cellulose, biopolymers
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
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- C10M2215/08—Amides
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- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2227/00—Organic non-macromolecular compounds containing atoms of elements not provided for in groups C10M2203/00, C10M2207/00, C10M2211/00, C10M2215/00, C10M2219/00 or C10M2223/00 as ingredients in lubricant compositions
- C10M2227/04—Organic non-macromolecular compounds containing atoms of elements not provided for in groups C10M2203/00, C10M2207/00, C10M2211/00, C10M2215/00, C10M2219/00 or C10M2223/00 as ingredients in lubricant compositions having a silicon-to-carbon bond, e.g. organo-silanes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention relates to the technical field of building materials, and discloses a preparation method of a high-strength easy-demoulding aluminum alloy template, wherein the aluminum alloy template comprises an aluminum alloy matrix and a demoulding layer attached to the surface of the aluminum alloy matrix, and the preparation method comprises the following steps of S1, preparation of modified silicon dioxide; s2, preparing a carbon nanotube mixed solution; uniformly mixing modified silicon dioxide and absolute ethyl alcohol, dropwise adding the mixture into the carbon nano tube mixed solution, fully reacting under a stirring state, applying a steep pulse electric field for treatment during stirring, and separating and purifying under microwave oscillation to obtain a modified silicon dioxide coated carbon nano tube; s3, preparing a high-strength release agent in a moderate manner; s4, growing a compact oxide layer on the surface of the aluminum alloy substrate in situ; and S5, uniformly spraying the demolding slurry on the surface of the aluminum alloy base body to form a demolding layer. The invention can form a high-strength demoulding layer on the surface of the aluminum alloy template, thereby reducing the damage of the aluminum alloy template to the demoulding layer in the using or transferring process.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a preparation method of a high-strength easy-demoulding aluminum alloy template.
Background
The building template consists of a panel and a supporting system, wherein the panel is a part for forming concrete; the support system is the structural part that stabilizes the position of the panels and bears the upper load. The traditional three-large log formwork can not meet the increasing quality requirement of the current building industry. At present, on the basis of the development of the traditional three-raw material templates, an aluminum alloy template supporting system is produced at the same time. The self-weight is light, the rigidity is high, and the appearance and the engineering progress of the concrete structural surface can be well controlled. However, the existing aluminum alloy templates also have the problems of steel templates, one is that the part combined with concrete is easily corroded and rusted by the concrete, and the other is that the part is easily adhered with the concrete in the concrete pouring process, so that the demoulding is difficult, and the recycling of the aluminum alloy templates is influenced.
To this end, a patent (publication No. CN 109652835B) developed and granted by the present applicant discloses an easy-to-release aluminum alloy template and a preparation method thereof, wherein the aluminum alloy template comprises an aluminum alloy substrate and a release layer attached to the surface of the aluminum alloy substrate, and the preparation of the release layer comprises the following raw materials in parts by weight: 1-5 parts of polyvinyl alcohol, 4-6 parts of stearic acid, 3-5 parts of stearic acid amide, 4-8 parts of konjac glucomannan, 15-20 parts of konjac flour, 15-20 parts of sodium alginate, 1-3 parts of borax, 5-7 parts of modified shell powder, 5-10 parts of modified silicon dioxide, 2-4 parts of aluminum sulfate, 2-6 parts of sodium methyl silicate, 1-3 parts of sodium dodecyl sulfate and 0.3-0.7 part of an organic silicon defoaming agent.
According to the scheme, the demolding layer is directly formed on the surface of the aluminum alloy matrix, demolding is easier, the number of times of recycling is more, the demolding quality of concrete is improved to a certain extent, and the demolding efficiency of the aluminum alloy template is improved. However, the following problems still remain: in the work progress of aluminum mould board, the workman is irregular installation, dismantlement and handling, and aluminum mould board can be intentionally and unintentionally with reinforcing bar, concrete collision friction because the hardness that the aluminium alloy surface formed the release agent coating is not enough, will lead to the coating surface damage of release agent like this, if damage area is great on the aluminum mould board, also can influence the normal drawing of patterns of aluminum mould board.
Disclosure of Invention
In view of the above, the present invention provides a method for preparing a high-strength easy-to-demold aluminum alloy form, which can form a high-strength demolding layer on the surface of the aluminum alloy form, so as to reduce damage to the demolding layer during use or transportation of the aluminum alloy form.
The invention solves the technical problems by the following technical means:
a preparation method of a high-strength easy-demoulding aluminum alloy template comprises an aluminum alloy matrix and a demoulding layer attached to the surface of the aluminum alloy matrix, and comprises the following steps of,
s1, preparation of modified silica: adding dodecyl triethoxysilane into 2% ethanol solution, hydrolyzing for 10min, adding porous rose-shaped hierarchical silica particles, performing microwave dispersion, performing reflux reaction for 4-6h under 40 deg.C water bath heating condition, centrifuging after reaction, washing the obtained solid reactant with anhydrous ethanol for 3 times, washing with deionized water until pH is 7, and vacuum drying for 12h to obtain modified silica;
s2, preparing the modified silicon dioxide coated carbon nano tube: uniformly mixing 2-3 parts of carbon nanotubes, 3-4 parts of sp-80, 5-6 parts of absolute ethyl alcohol and 10-20 parts of deionized water according to parts by weight to obtain a carbon nanotube mixed solution; uniformly mixing 10-15 parts of modified silicon dioxide and 15-20 parts of absolute ethyl alcohol, dripping into the carbon nanotube mixed solution, fully reacting under a stirring state, applying a steep pulse electric field for treatment during stirring, and separating and purifying for 1-2 hours under microwave oscillation to obtain a modified silicon dioxide coated carbon nanotube;
s3, preparation of a high-strength release agent: taking 1-5 parts of polyvinyl alcohol, 4-6 parts of stearic acid, 3-5 parts of stearic acid amide, 4-8 parts of konjac glucomannan, 15-20 parts of konjac flour, 15-20 parts of sodium alginate, 15-20 parts of modified silicon dioxide coated carbon nano tube, 2-4 parts of aluminum sulfate, 2-6 parts of sodium methyl silicate, 1-3 parts of sodium dodecyl sulfate and 0.3-0.7 part of organic silicon defoamer, and stirring at the temperature of 50-60 ℃ and the rotating speed of 3000r/min for 20-30min to obtain demolding slurry;
s4, pretreatment of the aluminum alloy substrate: grinding and polishing an aluminum alloy matrix, soaking in a sodium hydroxide solution with the pH value of 9 for 5-10min, ultrasonically cleaning with ethanol and distilled water for 15-20min after soaking, blow-drying with clean and dry compressed air, placing in a micro-arc oxidation electrolyte, performing micro-arc oxidation treatment for 20-25min, and growing a compact oxide layer in situ on the surface of the aluminum alloy matrix;
s5, coating: and (3) carrying out secondary polishing on the pretreated aluminum alloy matrix material until the surface roughness is less than 0.3, then uniformly spraying the demolding slurry on the surface of the aluminum alloy matrix, drying and curing at 70-90 ℃ to form a demolding layer, and thus obtaining the high-strength easy-demolding aluminum alloy template.
Further, according to the mass portion, the dodecyl triethoxy silane accounts for 10-15 portions, and the silicon dioxide particles with the porous rose-shaped hierarchical structure account for 20-30 portions.
Further, the preparation method of the porous rose-shaped hierarchical structure silicon dioxide particles comprises the following steps: dissolving 50 parts of tetraethyl silicate in an ethanol solution, stirring for 20min at the speed of 80r/min, adding 0.1mol/L potassium hydroxide solution to adjust the pH value to 6.0, then adding 30 parts of polyimide particles, performing ultrasonic dispersion, placing the reaction solution into a high-pressure kettle, performing heat preservation reaction at 220 ℃ for 24h, filtering and washing after the reaction is finished, drying the obtained solid product, placing the solid product into a calcining furnace, and calcining for 4h at 600 ℃ to obtain the silica particles with the porous rosette hierarchical structure.
Further, the process conditions of the micro arc oxidation treatment in the step S5 are as follows: an aluminum alloy matrix is taken as an anode, a stainless steel tank body is taken as a cathode, and the current density of the anode is 18A/dm2The cathode/anode current density ratio was 0.8 and the electrolyte temperature was 55 ℃. Under the micro-arc oxidation condition, the produced oxide layer has higher hardness, tighter structure, smoother surface and no obvious holes.
Further, the electrolyte contains 2.0g/L of sodium hydroxide, 5g/L of sodium phosphate, 3g/L of sodium silicate and 3mL/L of hydrogen peroxide.
Further, in the step S3, 3 parts of polyvinyl alcohol, 5 parts of stearic acid, 4 parts of stearic acid amide, 6 parts of konjac glucomannan, 17 parts of konjac flour, 17 parts of sodium alginate, 17 parts of modified silicon dioxide-coated carbon nanotubes, 3 parts of aluminum sulfate, 4 parts of sodium methyl silicate, 2 parts of sodium dodecyl sulfate, and 0.5 part of an organic silicon defoamer.
Further, the steep pulse applied in the step S2 has a peak value of the high voltage steep pulse of 220V, a pulse width of 6-10 μ S, a repetition frequency of 600-.
The invention has the beneficial effects that:
1. according to the invention, the high-strength demoulding layer is directly formed on the aluminum alloy template substrate, the polyvinyl alcohol, stearic acid amide, konjac glucomannan, konjac flour and sodium alginate are used as main film forming substances, and the modified silica-coated carbon nano tube is added, so that the film forming strength can be further enhanced, and the modified silica-coated carbon nano tube has better hydrophobic property, so that the hydrophobic property of the demoulding layer can be increased to a certain extent, and the demoulding is easier.
2. According to the invention, when the modified silicon dioxide coated carbon nano tube is prepared, a steep pulse electric field is applied, and the microwave oscillation is carried out for 1-2 hours, so that the carbon nano tube can be partially coated in the micropores of the modified silicon dioxide, and thus, the film layer has good hydrophobicity and high strength of the carbon nano tube, the film layer is not easy to damage under the condition of collision and friction with reinforcing steel bars and concrete, and the aluminum alloy template is more in recycling times.
3. The invention abandons the use of borax, and can reduce the pollution to the environment in the production process.
Detailed Description
The present invention will be described in detail with reference to examples below:
examples 1,
A preparation method of a high-strength easy-demoulding aluminum alloy template comprises an aluminum alloy matrix and a demoulding layer attached to the surface of the aluminum alloy matrix, and comprises the following steps of,
s1, dissolving 50kg of tetraethyl silicate in an ethanol solution, stirring for 20min at the speed of 80r/min, adding 0.1mol/L potassium hydroxide solution to adjust the pH value to 6.0, adding 30kg of polyimide particles, performing ultrasonic dispersion, placing the reaction solution into a high-pressure kettle, performing heat preservation reaction at 220 ℃ for 24h, filtering and washing after the reaction is finished, drying the obtained solid product, placing the dried solid product into a calcining furnace, and calcining for 4h at 600 ℃ to obtain silica particles with a porous rose-shaped hierarchical structure;
s2, adding 10kg of dodecyl triethoxy silane into a 2% ethanol solution for hydrolysis for 10min, adding 20kg of porous rose-shaped hierarchical silicon dioxide particles, performing microwave dispersion, performing reflux reaction for 4h under a water bath heating condition at 40 ℃, centrifuging after the reaction is completed, washing the obtained solid reactant with absolute ethyl alcohol for 3 times, washing with deionized water until the pH value is 7, and performing vacuum drying for 12h to obtain modified silicon dioxide;
s3, uniformly mixing 2kg of carbon nanotubes, 3kg of sp-80, 5kg of absolute ethyl alcohol and 10kg of deionized water to obtain a carbon nanotube mixed solution; uniformly mixing 10kg of modified silicon dioxide and 15kg of absolute ethyl alcohol, dropwise adding the mixture into a carbon nano tube mixed solution, fully reacting under a stirring state, applying a steep pulse electric field for treatment during stirring, wherein the peak value of the applied steep pulse specific high-voltage steep pulse is 220V, the pulse width is 6 microseconds, the repetition frequency is 600Hz, the pulse gradient is 100ns, and separating and purifying for 1 hour under microwave oscillation to obtain the modified silicon dioxide coated carbon nano tube;
s4, stirring 1kg of polyvinyl alcohol, 4kg of stearic acid, 3kg of stearic acid amide, 4kg of konjac glucomannan, 15kg of konjac flour, 15kg of sodium alginate, 15kg of modified silicon dioxide coated carbon nano tube, 2kg of aluminum sulfate, 2kg of sodium methylsilicate, 1kg of sodium dodecyl sulfate and 0.3kg of organic silicon defoamer for 20min at the temperature of 50 ℃ and the rotating speed of 2000r/min to obtain demolding slurry;
s5, grinding and polishing the aluminum alloy matrix, soaking the aluminum alloy matrix in a sodium hydroxide solution with the pH value of 9 for 5min, ultrasonically cleaning the aluminum alloy matrix with ethanol and distilled water for 15min after soaking, blow-drying the aluminum alloy matrix with clean and dry compressed air, placing the aluminum alloy matrix in micro-arc oxidation electrolyte, performing micro-arc oxidation treatment for 20min, and growing a compact oxide layer on the surface of the aluminum alloy matrix in situ; the process conditions of the micro-arc oxidation treatment comprise that an aluminum alloy matrix is used as an anode, a stainless steel tank body is used as a cathode, the current density of the anode is 18A/dm2, the current density ratio of the cathode to the anode is 0.8, the temperature of electrolyte is 55 ℃, and the electrolyte contains 2.0g/L sodium hydroxide, 5g/L sodium phosphate, 3g/L sodium silicate and 3mL/L hydrogen peroxide;
s6, polishing the pretreated aluminum alloy matrix material for the second time until the surface roughness is less than 0.3, then uniformly spraying the demolding slurry on the surface of the aluminum alloy matrix, drying and curing at 70 ℃ to form a demolding layer, and finally obtaining the high-strength easy-demolding aluminum alloy template.
Examples 2,
A preparation method of a high-strength easy-demoulding aluminum alloy template comprises an aluminum alloy matrix and a demoulding layer attached to the surface of the aluminum alloy matrix, and comprises the following steps of,
s1, dissolving 50kg of tetraethyl silicate in an ethanol solution, stirring for 20min at the speed of 80r/min, adding 0.1mol/L potassium hydroxide solution to adjust the pH value to 6.0, adding 30kg of polyimide particles, performing ultrasonic dispersion, placing the reaction solution into a high-pressure kettle, performing heat preservation reaction at 220 ℃ for 24h, filtering and washing after the reaction is finished, drying the obtained solid product, placing the dried solid product into a calcining furnace, and calcining for 4h at 600 ℃ to obtain silica particles with a porous rose-shaped hierarchical structure;
s2, adding 12.5kg of dodecyl triethoxy silane into a 2% ethanol solution for hydrolysis for 10min, adding 25kg of porous rose-shaped hierarchical structure silica particles, dispersing by microwave, carrying out reflux reaction for 5h under the water bath heating condition of 40 ℃, centrifuging after the reaction is finished, washing the obtained solid reactant with absolute ethyl alcohol for 3 times, washing with deionized water until the pH value is 7, and carrying out vacuum drying for 12h to obtain modified silica;
s3, uniformly mixing 2.5kg of carbon nanotubes, 3.5kg of sp-80, 5.5kg of absolute ethyl alcohol and 15kg of deionized water to obtain a carbon nanotube mixed solution; uniformly mixing 12.5kg of modified silicon dioxide and 17.5kg of absolute ethyl alcohol, dropwise adding the mixture into a carbon nano tube mixed solution, fully reacting under a stirring state, applying a steep pulse electric field for treatment during stirring, wherein the peak value of a specific high-voltage steep pulse of the applied steep pulse is 220V, the pulse width is 8 mu s, the repetition frequency is 700Hz, the pulse gradient is 110ns, and separating and purifying for 1.5h under microwave oscillation to obtain a modified silicon dioxide coated carbon nano tube;
s4, taking 3kg of polyvinyl alcohol, 5kg of stearic acid, 4kg of stearic amide, 6kg of konjac glucomannan, 17.5kg of konjac flour, 17.5kg of sodium alginate, 17.5kg of modified silicon dioxide coated carbon nano tube, 3kg of aluminum sulfate, 4kg of sodium methylsilicate, 2kg of sodium dodecyl sulfate and 0.5kg of organic silicon defoamer, and stirring at the temperature of 55 ℃ and the rotating speed of 2500r/min for 25min to obtain demolding slurry;
s5, grinding and polishing the aluminum alloy matrix, soaking the aluminum alloy matrix in a sodium hydroxide solution with the pH value of 9 for 7min, ultrasonically cleaning the aluminum alloy matrix with ethanol and distilled water for 17min after soaking, blow-drying the aluminum alloy matrix with clean and dry compressed air, placing the aluminum alloy matrix in micro-arc oxidation electrolyte, performing micro-arc oxidation treatment for 22min, and growing a compact oxide layer on the surface of the aluminum alloy matrix in situ; the process conditions of the micro-arc oxidation treatment comprise that an aluminum alloy matrix is used as an anode, a stainless steel tank body is used as a cathode, the current density of the anode is 18A/dm2, the current density ratio of the cathode to the anode is 0.8, the temperature of electrolyte is 55 ℃, and the electrolyte contains 2.0g/L sodium hydroxide, 5g/L sodium phosphate, 3g/L sodium silicate and 3mL/L hydrogen peroxide;
s6, polishing the pretreated aluminum alloy matrix material for the second time until the surface roughness is less than 0.3, then uniformly spraying the demolding slurry on the surface of the aluminum alloy matrix, drying and curing at 80 ℃ to form a demolding layer, and finally obtaining the high-strength easy-demolding aluminum alloy template.
Examples 3,
A preparation method of a high-strength easy-demoulding aluminum alloy template comprises an aluminum alloy matrix and a demoulding layer attached to the surface of the aluminum alloy matrix, and comprises the following steps of,
s1, dissolving 50kg of tetraethyl silicate in an ethanol solution, stirring for 20min at the speed of 80r/min, adding 0.1mol/L potassium hydroxide solution to adjust the pH value to 6.0, adding 30kg of polyimide particles, performing ultrasonic dispersion, placing the reaction solution into a high-pressure kettle, performing heat preservation reaction at 220 ℃ for 24h, filtering and washing after the reaction is finished, drying the obtained solid product, placing the dried solid product into a calcining furnace, and calcining for 4h at 600 ℃ to obtain silica particles with a porous rose-shaped hierarchical structure;
s2, adding 15kg of dodecyl triethoxy silane into a 2% ethanol solution for hydrolysis for 10min, adding 30kg of porous rose-shaped hierarchical silicon dioxide particles, performing microwave dispersion, performing reflux reaction for 6h under a water bath heating condition at 40 ℃, centrifuging after the reaction is completed, washing the obtained solid reactant with absolute ethyl alcohol for 3 times, washing with deionized water until the pH value is 7, and performing vacuum drying for 12h to obtain modified silicon dioxide;
s3, uniformly mixing 3kg of carbon nanotubes, 4kg of sp-80, 6kg of absolute ethyl alcohol and 20kg of deionized water to obtain a carbon nanotube mixed solution; uniformly mixing 15kg of modified silicon dioxide and 20kg of absolute ethyl alcohol, dropwise adding the mixture into a carbon nano tube mixed solution, fully reacting under a stirring state, applying a steep pulse electric field for treatment during stirring, wherein the peak value of the applied steep pulse specific high-voltage steep pulse is 220V, the pulse width is 10 microseconds, the repetition frequency is 800Hz, the pulse gradient is 120ns, and separating and purifying for 2 hours under microwave oscillation to obtain the modified silicon dioxide coated carbon nano tube;
s4, stirring 5kg of polyvinyl alcohol, 6kg of stearic acid, 5kg of stearic acid amide, 8kg of konjac glucomannan, 20kg of konjac flour, 20kg of sodium alginate, 20kg of modified silicon dioxide coated carbon nano tube, 4kg of aluminum sulfate, 6kg of sodium methylsilicate, 3kg of sodium dodecyl sulfate and 0.7kg of organic silicon defoamer for 30min at the temperature of 60 ℃ and the rotating speed of 3000r/min to obtain demolding slurry;
s5, grinding and polishing the aluminum alloy matrix, soaking the aluminum alloy matrix in a sodium hydroxide solution with the pH value of 9 for 10min, ultrasonically cleaning the aluminum alloy matrix with ethanol and distilled water for 20min after soaking, blow-drying the aluminum alloy matrix with clean and dry compressed air, placing the aluminum alloy matrix in micro-arc oxidation electrolyte, performing micro-arc oxidation treatment for 25min, and growing a compact oxide layer on the surface of the aluminum alloy matrix in situ; the process conditions of the micro-arc oxidation treatment comprise that an aluminum alloy matrix is used as an anode, a stainless steel tank body is used as a cathode, the current density of the anode is 18A/dm2, the current density ratio of the cathode to the anode is 0.8, the temperature of electrolyte is 55 ℃, and the electrolyte contains 2.0g/L sodium hydroxide, 5g/L sodium phosphate, 3g/L sodium silicate and 3mL/L hydrogen peroxide;
s6, polishing the pretreated aluminum alloy matrix material for the second time until the surface roughness is less than 0.3, then uniformly spraying the demolding slurry on the surface of the aluminum alloy matrix, drying and curing at 90 ℃ to form a demolding layer, and finally obtaining the high-strength easy-demolding aluminum alloy template.
Comparative examples,
Comparative example the preparation method of patent publication No. CN 109652835B mentioned in the background art was used.
The following criteria were tested according to examples 1-3, and comparative examples, with the following results:
the test results show that the high-strength aluminum alloy template not only enables the film layer to have good hydrophobicity, but also enables the film layer to have the high-strength performance of the carbon nano tube, so that the film layer is not easy to damage under the condition of collision and friction with reinforcing steel bars and concrete, and the aluminum alloy template is more in recycling times.
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims. The techniques, shapes, and configurations not described in detail in the present invention are all known techniques.
Claims (7)
1. The preparation method of the high-strength easy-demoulding aluminum alloy template comprises an aluminum alloy matrix and a demoulding layer attached to the surface of the aluminum alloy matrix, and is characterized in that: the preparation method of the aluminum alloy template comprises the following steps,
s1, preparation of modified silica: adding dodecyl triethoxysilane into 2% ethanol solution, hydrolyzing for 10min, adding porous rose-shaped hierarchical silica particles, performing microwave dispersion, performing reflux reaction for 4-6h under 40 deg.C water bath heating condition, centrifuging after reaction, washing the obtained solid reactant with anhydrous ethanol for 3 times, washing with deionized water until pH is 7, and vacuum drying for 12h to obtain modified silica;
s2, preparing the modified silicon dioxide coated carbon nano tube: uniformly mixing 2-3 parts of carbon nanotubes, 3-4 parts of sp-80, 5-6 parts of absolute ethyl alcohol and 10-20 parts of deionized water according to parts by weight to obtain a carbon nanotube mixed solution; uniformly mixing 10-15 parts of modified silicon dioxide and 15-20 parts of absolute ethyl alcohol, dripping into the carbon nanotube mixed solution, fully reacting under a stirring state, applying a steep pulse electric field for treatment during stirring, and separating and purifying for 1-2 hours under microwave oscillation to obtain a modified silicon dioxide coated carbon nanotube;
s3, preparation of a high-strength release agent: taking 1-5 parts of polyvinyl alcohol, 4-6 parts of stearic acid, 3-5 parts of stearic acid amide, 4-8 parts of konjac glucomannan, 15-20 parts of konjac flour, 15-20 parts of sodium alginate, 15-20 parts of modified silicon dioxide coated carbon nano tube, 2-4 parts of aluminum sulfate, 2-6 parts of sodium methyl silicate, 1-3 parts of sodium dodecyl sulfate and 0.3-0.7 part of organic silicon defoamer, and stirring at the temperature of 50-60 ℃ and the rotating speed of 3000r/min for 20-30min to obtain demolding slurry;
s4, pretreatment of the aluminum alloy substrate: grinding and polishing an aluminum alloy matrix, soaking in a sodium hydroxide solution with the pH value of 9 for 5-10min, ultrasonically cleaning with ethanol and distilled water for 15-20min after soaking, blow-drying with clean and dry compressed air, placing in a micro-arc oxidation electrolyte, performing micro-arc oxidation treatment for 20-25min, and growing a compact oxide layer in situ on the surface of the aluminum alloy matrix;
s5, coating: and (3) carrying out secondary polishing on the pretreated aluminum alloy matrix material until the surface roughness is less than 0.3, then uniformly spraying the demolding slurry on the surface of the aluminum alloy matrix, drying and curing at 70-90 ℃ to form a demolding layer, and thus obtaining the high-strength easy-demolding aluminum alloy template.
2. The preparation method of the high-strength easy-demoulding aluminum alloy template as claimed in claim 1, characterized in that: according to the mass portion, the dodecyl triethoxy silane accounts for 10-15 parts, and the silicon dioxide particles with porous rose-shaped hierarchical structures account for 20-30 parts.
3. The preparation method of the high-strength easy-demoulding aluminum alloy template as claimed in claim 2, characterized in that: the preparation method of the silica particles with the porous rosette hierarchical structure comprises the following steps: dissolving 50 parts of tetraethyl silicate in an ethanol solution, stirring for 20min at the speed of 80r/min, adding 0.1mol/L potassium hydroxide solution to adjust the pH value to 6.0, then adding 30 parts of polyimide particles, performing ultrasonic dispersion, placing the reaction solution into a high-pressure kettle, performing heat preservation reaction at 220 ℃ for 24h, filtering and washing after the reaction is finished, drying the obtained solid product, placing the solid product into a calcining furnace, and calcining for 4h at 600 ℃ to obtain the silica particles with the porous rosette hierarchical structure.
4. The preparation method of the high-strength easy-demoulding aluminum alloy template as claimed in claim 3, characterized in that: the process conditions of the micro-arc oxidation treatment in the step S5 are as follows: an aluminum alloy matrix is taken as an anode, a stainless steel tank body is taken as a cathode, and the current density of the anode is 18A/dm2The cathode/anode current density ratio was 0.8 and the electrolyte temperature was 55 ℃.
5. The preparation method of the high-strength easy-demoulding aluminum alloy template as claimed in claim 4, wherein the preparation method comprises the following steps: the electrolyte contains 2.0g/L of sodium hydroxide, 5g/L of sodium phosphate, 3g/L of sodium silicate and 3mL/L of hydrogen peroxide.
6. The method for preparing the high-strength easy-demoulding aluminum alloy template as recited in claim 5, wherein: in the step S3, 3 parts of polyvinyl alcohol, 5 parts of stearic acid, 4 parts of stearic acid amide, 6 parts of konjac glucomannan, 17 parts of konjac flour, 17 parts of sodium alginate, 17 parts of modified silicon dioxide coated carbon nanotubes, 3 parts of aluminum sulfate, 4 parts of sodium methyl silicate, 2 parts of sodium dodecyl sulfate and 0.5 part of an organic silicon defoamer.
7. The method for preparing the high-strength easy-demoulding aluminum alloy template as recited in claim 6, wherein: the peak value of the high voltage steep pulse applied in the step S2 is 220V, the pulse width is 6-10 mus, the repetition frequency is 600-.
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