CN111909594A - Molecular sieve coating aluminum foil with anticorrosion function and preparation process thereof - Google Patents
Molecular sieve coating aluminum foil with anticorrosion function and preparation process thereof 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
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
- B05D7/16—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies using synthetic lacquers or varnishes
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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
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
- C09D5/10—Anti-corrosive paints containing metal dust
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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
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
- C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
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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
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/65—Additives macromolecular
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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
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2504/00—Epoxy polymers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/08—Metals
- C08K2003/085—Copper
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2312/00—Crosslinking
Abstract
The invention discloses a molecular sieve coating aluminum foil with an anticorrosion function and a preparation process thereof, wherein the aluminum foil 1 comprises an aluminum foil and a water-based epoxy resin coating; the waterborne epoxy resin coating is coated on two surfaces of the aluminum foil; the waterborne epoxy resin coating comprises the following raw materials in parts by weight: water-based epoxy resin, polyethyleneimine, nano copper powder and a molecular sieve; the nano copper powder is distributed at the interface of the aqueous epoxy resin and the aluminum foil; and the nano copper powder is adsorbed by carboxyl in the molecular structure of the waterborne epoxy resin. When in preparation, water, waterborne epoxy resin, cyclohexane and polyethyleneimine are stirred and mixed uniformly, and carbon dioxide gas is continuously introduced during stirring to obtain waterborne epoxy resin emulsion; adding a copper salt solution with the mass of 10-20% of that of the aqueous epoxy resin emulsion into the aqueous epoxy resin emulsion, adding a reducing agent, heating, stirring, reacting, and concentrating under reduced pressure to obtain a concentrated solution; coating the concentrated solution on the surface of the aluminum foil, and controlling the thickness of the coating film to be 100-200 mu m.
Description
Technical Field
The invention relates to the field of heat exchanger part materials, in particular to a molecular sieve coating aluminum foil with an anti-corrosion function and a preparation process thereof.
Background
The heat exchanger of the air conditioner has the function of air conditioner heat exchange, the heat exchanger adopted by a common household air conditioner is a copper pipe aluminum fin type heat exchanger, the main heat resistance of the heat exchanger is the heat exchange heat resistance between an air side fin and air, which accounts for about 70-80% of the total heat resistance of the heat exchanger, and the heat exchange efficiency of the heat exchanger is directly influenced by the state of the aluminum fin, so that whether the air conditioner is energy-saving or not is influenced.
The condenser fins of the air conditioner are often seen to be whitened in places of seashores and islands, and parts of the condenser fins are weathered or even fall off, so that the use quality and the energy efficiency of the air conditioner are seriously reduced. The reason is that near seashore or in areas with severe industrial pollution, impurities in the air, such as salts or acids, can accelerate the erosion of the fin surface and the corrosion of the fin. The conventional heat exchanger fins cannot bear the long-term corrosion at sea or in polluted atmosphere, and new fin technical schemes must be researched aiming at the special use environments.
The international standard ISO12944-5 roughly divides the atmospheric environment into four types of rural atmosphere, urban atmosphere, industrial atmosphere and marine atmosphere according to the corrosiveness of different atmospheric environments and the pollution degree of pollutants characteristic of the atmospheric environments, and seaside climate with high temperature and high humidity is the highest level corrosive climate, particularly in some island countries, the corrosion and falling speed of the fins of the heat exchanger of the air conditioner installed on the island is the fastest.
At present, a common air conditioner heat exchanger fin is punched by an aluminum foil with a coating, and how to improve the corrosion resistance of the aluminum foil heat exchanger fin and ensure that the heat transfer performance of the heat exchanger fin is not reduced is one of the technical problems to be solved urgently by technical staff in the field.
Disclosure of Invention
The invention aims to provide a molecular sieve coating aluminum foil with an anti-corrosion function and a preparation process thereof, and aims to overcome the defect that the aluminum foil heat exchanger fin in the prior art cannot give consideration to both anti-corrosion performance and heat transfer performance.
In order to achieve the purpose, the invention provides the following technical scheme:
a molecular sieve coating aluminum foil with an anticorrosion function comprises an aluminum foil and a water-based epoxy resin coating; the waterborne epoxy resin coating is coated on two surfaces of the aluminum foil;
the waterborne epoxy resin coating comprises the following raw materials in parts by weight: water-based epoxy resin, polyethyleneimine, nano copper powder and a molecular sieve;
the nano copper powder is distributed at the interface of the aqueous epoxy resin and the aluminum foil; and the nano copper powder is adsorbed by carboxyl in the molecular structure of the waterborne epoxy resin.
A preparation process of a molecular sieve coating aluminum foil with an anticorrosion function comprises the following specific preparation steps:
preparing a water-based epoxy resin emulsion:
according to the weight parts, 80-100 parts of water, 40-60 parts of waterborne epoxy resin, 80-100 parts of cyclohexane and 4-10 parts of polyethyleneimine are taken in sequence, stirred and mixed uniformly, and carbon dioxide gas is continuously introduced in the stirring process to obtain waterborne epoxy resin emulsion;
reduction of copper ions:
adding a copper salt solution with the mass of 10-20% of that of the aqueous epoxy resin emulsion into the aqueous epoxy resin emulsion, adding a reducing agent, heating, stirring, reacting, and concentrating under reduced pressure to obtain a concentrated solution;
coating of a coating:
coating the concentrated solution on the surface of the aluminum foil, and controlling the thickness of the coating film to be 100-200 mu m.
Compared with the prior art, the beneficial effect of the above technical scheme is:
(1) according to the technical scheme, the amphiphilic epoxy resin with the molecular structure containing both hydrophilic groups and hydrophobic groups is adopted, a microemulsion system is constructed by the amphiphilic epoxy resin, polyethyleneimine is matched with carbon dioxide, and the polyethyleneimine is subjected to a crosslinking reaction under the action of the carbon dioxide to form a crosslinking network, so that emulsion microparticles are limited in a quantitative network structure, the storage stability of the emulsion is improved, and phase separation is avoided; in the subsequent preparation process, a copper salt solution is introduced into a microemulsion system, the copper salt solution is firstly adsorbed and fixed by carboxyl of amphiphilic epoxy resin in an aqueous solution system, so that copper ions are fixed at an oil-water interface, in the subsequent reduction process, elemental copper is dispersed at the interface of an aluminum foil and the epoxy resin, the particle size of the newly generated elemental copper is in a nanometer level or even smaller, the surface activity is higher, the compatibility with the surface of the aluminum foil is high, the interaction force is strong, the interface compatibility of the epoxy resin system and the surface of the aluminum foil can be effectively improved, the interface thermal resistance between the epoxy resin and the aluminum foil can be effectively reduced, and the heat in the aluminum foil can be quickly transferred to the surface to be dissipated;
(2) according to the technical scheme, the molecular sieve structure is introduced into the epoxy resin system, and the nano silicon dioxide is adsorbed and fixed on the surface of the molecular sieve, the island-shaped structure is formed on the surface of the molecular sieve, so that the surface roughness of the molecular sieve is improved, the macromolecular chains of the epoxy resin are wound and hung on the surface of the molecular sieve to form a physical winding structure, the volume change of the surface coating caused by the temperature change in the heat transfer process is effectively avoided, the shedding of the surface coating is avoided, and the corrosion resistance of the product is effectively maintained.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A molecular sieve coating aluminum foil with an anticorrosion function comprises an aluminum foil and a water-based epoxy resin coating; the waterborne epoxy resin coating is coated on two surfaces of the aluminum foil;
the waterborne epoxy resin coating comprises the following raw materials in parts by weight: water-based epoxy resin, polyethyleneimine, nano copper powder and a molecular sieve;
the nano copper powder is distributed at the interface of the aqueous epoxy resin and the aluminum foil; and the nano copper powder is adsorbed by carboxyl in the molecular structure of the waterborne epoxy resin.
Furthermore, the waterborne epoxy resin is amphiphilic epoxy resin, and the molecular structure of the amphiphilic epoxy resin contains carboxyl and epoxy functional groups at the same time.
Furthermore, the epoxy resin is any one of epoxy resin E-42, epoxy resin E-41 and epoxy resin E-51.
Furthermore, nano silicon dioxide is adsorbed on the surface of the molecular sieve, and the nano silicon dioxide is treated by a silane coupling agent.
A preparation process of a molecular sieve coating aluminum foil with an anticorrosion function comprises the following specific preparation steps:
preparing a water-based epoxy resin emulsion:
according to the weight parts, 80-100 parts of water, 40-60 parts of waterborne epoxy resin, 80-100 parts of cyclohexane and 4-10 parts of polyethyleneimine are taken in sequence, stirred and mixed uniformly, and carbon dioxide gas is continuously introduced in the stirring process to obtain waterborne epoxy resin emulsion;
reduction of copper ions:
adding a copper salt solution with the mass of 10-20% of that of the aqueous epoxy resin emulsion into the aqueous epoxy resin emulsion, adding a reducing agent, heating, stirring, reacting, and concentrating under reduced pressure to obtain a concentrated solution;
coating of a coating:
coating the concentrated solution on the surface of the aluminum foil, and controlling the thickness of the coating film to be 100-200 mu m.
Further, the specific preparation steps further comprise:
preparation of the waterborne epoxy resin:
according to the weight portion, 40-50 portions of epoxy resin, 80-120 portions of solvent, 2-4 portions of catalyst and 10-15 portions of adipic acid are taken in sequence, heated, stirred and reacted, and the solvent is removed by reduced pressure distillation, so that the waterborne epoxy resin is obtained.
Further, the preparation method comprises the following specific steps:
modification of the molecular sieve:
according to the weight portion, 10-15 portions of nano silicon dioxide, 3-5 portions of silane coupling agent and 100 portions of ethanol solution are taken in sequence, and after mixing, the nano silicon dioxide dispersion liquid is obtained by heating, stirring and reacting; and then mixing the obtained nano silicon dioxide dispersion liquid with a molecular sieve according to the mass ratio of 5: 1-10: 1, filtering, washing and drying after mixing reaction to obtain the modified molecular sieve;
preparing a water-based epoxy resin emulsion:
according to the weight parts, 80-100 parts of water, 40-60 parts of waterborne epoxy resin, 80-100 parts of cyclohexane, 4-10 parts of polyethyleneimine and 4-10 parts of modified molecular sieve are taken in sequence, stirred and mixed uniformly, and carbon dioxide gas is continuously introduced in the stirring process to obtain waterborne epoxy resin emulsion;
reduction of copper ions:
adding a copper salt solution with the mass of 10-20% of that of the aqueous epoxy resin emulsion into the aqueous epoxy resin emulsion, adding a reducing agent, heating, stirring, reacting, and concentrating under reduced pressure to obtain a concentrated solution;
coating of a coating:
coating the concentrated solution on the surface of the aluminum foil, and controlling the thickness of the coating film to be 100-200 mu m.
Furthermore, the epoxy resin is any one of epoxy resin E-42, epoxy resin E-41 and epoxy resin E-51.
Example 1
Modification of the molecular sieve:
according to the weight parts, sequentially taking 10 parts of nano-silica, 3 parts of silane coupling agent KH-560 and 100 parts of 10% ethanol solution, mixing, and heating, stirring and reacting for 3 hours at the temperature of 65 ℃ and the rotating speed of 300r/min to obtain nano-silica dispersion liquid; and then mixing the obtained nano silicon dioxide dispersion liquid with a molecular sieve according to the mass ratio of 5: 1, filtering, washing and drying after mixing reaction to obtain the modified molecular sieve;
preparation of the waterborne epoxy resin:
according to the weight parts, 40 parts of epoxy resin, 80 parts of solvent, 2 parts of catalyst and 10 parts of adipic acid are sequentially taken, heated and stirred for reaction for 3 hours at the temperature of 80 ℃ and the stirring speed of 300r/min, and the solvent is removed by reduced pressure distillation to obtain the waterborne epoxy resin; the epoxy resin is epoxy resin E-42;
preparing a water-based epoxy resin emulsion:
according to the weight parts, 80 parts of water, 40 parts of waterborne epoxy resin, 80 parts of cyclohexane and 4 parts of polyethyleneimine are taken in sequence, stirred and mixed uniformly, and carbon dioxide gas is continuously introduced in the stirring process to obtain waterborne epoxy resin emulsion;
reduction of copper ions:
adding a copper sulfate solution accounting for 10% of the weight of the emulsion into the aqueous epoxy resin emulsion, adding ascorbic acid, heating, stirring, reacting, and concentrating under reduced pressure to obtain a concentrated solution;
coating of a coating:
coating the concentrated solution on the surface of an aluminum foil, and controlling the thickness of a coating film to be 100 mu m.
Example 2
Modification of the molecular sieve:
taking 15 parts of nano-silica, 5 parts of silane coupling agent KH-570 and 120 parts of 80% ethanol solution in sequence by weight, mixing, and heating, stirring and reacting for 5 hours at the temperature of 75 ℃ and the rotating speed of 500r/min to obtain nano-silica dispersion liquid; and then mixing the obtained nano silicon dioxide dispersion liquid with a molecular sieve according to the mass ratio of 10: 1, filtering, washing and drying after mixing reaction to obtain the modified molecular sieve;
preparation of the waterborne epoxy resin:
according to the weight parts, 50 parts of epoxy resin, 120 parts of solvent, 4 parts of catalyst and 15 parts of adipic acid are sequentially taken, heated and stirred for reaction for 5 hours at the temperature of 90 ℃ and the stirring speed of 500r/min, and then the solvent is removed by reduced pressure distillation to obtain the waterborne epoxy resin; the epoxy resin is epoxy resin E-41;
preparing a water-based epoxy resin emulsion:
according to the weight parts, 100 parts of water, 60 parts of waterborne epoxy resin, 100 parts of cyclohexane and 10 parts of polyethyleneimine are taken in sequence, stirred and mixed uniformly, and carbon dioxide gas is continuously introduced in the stirring process to obtain waterborne epoxy resin emulsion;
reduction of copper ions:
adding a copper nitrate solution accounting for 20% of the mass of the emulsion into the aqueous epoxy resin emulsion, adding ascorbic acid, heating, stirring, reacting, and concentrating under reduced pressure to obtain a concentrated solution;
coating of a coating:
coating the concentrated solution on the surface of an aluminum foil, and controlling the thickness of a coating film to be 200 mu m.
Example 3
Modification of the molecular sieve:
according to the weight parts, sequentially taking 12 parts of nano-silica, 4 parts of silane coupling agent KH-550 and 110 parts of 50% ethanol solution, mixing, heating and stirring for reaction for 4 hours at the temperature of 70 ℃ and the rotating speed of 400r/min to obtain nano-silica dispersion liquid; and then mixing the obtained nano silicon dioxide dispersion liquid with a molecular sieve according to the mass ratio of 8: 1, filtering, washing and drying after mixing reaction to obtain the modified molecular sieve;
preparation of the waterborne epoxy resin:
according to the weight parts, 45 parts of epoxy resin, 90 parts of solvent, 3 parts of catalyst and 13 parts of adipic acid are sequentially taken, heated and stirred for reaction for 4 hours at the temperature of 85 ℃ and the stirring speed of 400r/min, and the solvent is removed by reduced pressure distillation to obtain the waterborne epoxy resin; the epoxy resin is epoxy resin E-51;
preparing a water-based epoxy resin emulsion:
according to the weight parts, sequentially taking 90 parts of water, 50 parts of waterborne epoxy resin, 90 parts of cyclohexane and 5 parts of polyethyleneimine, stirring and mixing uniformly, and continuously introducing carbon dioxide gas in the stirring process to obtain a waterborne epoxy resin emulsion;
reduction of copper ions:
adding a copper chloride solution accounting for 15% of the weight of the emulsion into the aqueous epoxy resin emulsion, adding ascorbic acid, heating, stirring, reacting, and concentrating under reduced pressure to obtain a concentrated solution;
coating of a coating:
coating the concentrated solution on the surface of an aluminum foil, and controlling the thickness of a coating film to be 150 mu m.
Comparative example 1
The comparative example is different from example 1 in that the copper sulfate solution is replaced with an equal mass of deionized water and the remaining conditions are maintained.
Comparative example 2
This comparative example is distinguished from example 1 in that no polyethyleneimine is added and the remaining conditions are maintained.
Comparative example 3
The comparative example is different from example 1 in that the epoxy resin is modified and directly used to prepare the emulsion, and the rest conditions are kept unchanged.
The products obtained in examples 1 to 3 and comparative examples 1 to 3 were subjected to performance tests, and the specific test methods and test results were as follows:
salt spray test: each of the above examples and comparative examples was cut into test pieces of 100 mm. times.50 mm, and placed in a constant temperature (35 ℃ C.) salt spray cabinet to control the salt spray sedimentation at 2g/80cm per hour2The amount of (c) was continuously sprayed, and the time at which corrosion occurred was observed, and the specific results are shown in table 1;
table 1: product performance test results
| Time to Corrosion/h | |
| Example 1 | 1200 |
| Example 2 | 1180 |
| Example 3 | 1300 |
| Comparative example 1 | 420 |
| Comparative example 2 | 620 |
| Comparative example 3 | 550 |
As can be seen from the test results in Table 1, the product obtained by the method has excellent corrosion resistance.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference thereto is therefore intended to be embraced therein.
Claims (8)
1. A molecular sieve coating aluminum foil with an anticorrosion function is characterized by comprising an aluminum foil and a water-based epoxy resin coating; the waterborne epoxy resin coating is coated on two surfaces of the aluminum foil;
the waterborne epoxy resin coating comprises the following raw materials in parts by weight: water-based epoxy resin, polyethyleneimine, nano copper powder and a molecular sieve;
the nano copper powder is distributed at the interface of the aqueous epoxy resin and the aluminum foil; and the nano copper powder is adsorbed by carboxyl in the molecular structure of the waterborne epoxy resin.
2. The aluminum foil with the molecular sieve coating and the corrosion prevention function as claimed in claim 1, wherein the water-based epoxy resin is an amphiphilic epoxy resin, and the molecular structure of the amphiphilic epoxy resin contains both carboxyl and epoxy functional groups.
3. The molecular sieve coated aluminum foil with an anticorrosion function as recited in any one of claims 1 or 2, wherein the epoxy resin is any one of epoxy resin E-42, epoxy resin E-41, and epoxy resin E-51.
4. The aluminum foil with the molecular sieve coating and the corrosion prevention function according to claim 1, wherein nano-silica is adsorbed on the surface of the molecular sieve, and the nano-silica is treated by a silane coupling agent.
5. A preparation process of a molecular sieve coating aluminum foil with an anticorrosion function is characterized by comprising the following specific preparation steps:
preparing a water-based epoxy resin emulsion:
according to the weight parts, 80-100 parts of water, 40-60 parts of waterborne epoxy resin, 80-100 parts of cyclohexane and 4-10 parts of polyethyleneimine are taken in sequence, stirred and mixed uniformly, and carbon dioxide gas is continuously introduced in the stirring process to obtain waterborne epoxy resin emulsion;
reduction of copper ions:
adding a copper salt solution with the mass of 10-20% of that of the aqueous epoxy resin emulsion into the aqueous epoxy resin emulsion, adding a reducing agent, heating, stirring, reacting, and concentrating under reduced pressure to obtain a concentrated solution;
coating of a coating:
coating the concentrated solution on the surface of the aluminum foil, and controlling the thickness of the coating film to be 100-200 mu m.
6. The preparation process of the molecular sieve coated aluminum foil with the anticorrosion function, according to claim 5, is characterized by further comprising the following specific preparation steps:
preparation of the waterborne epoxy resin:
according to the weight portion, 40-50 portions of epoxy resin, 80-120 portions of solvent, 2-4 portions of catalyst and 10-15 portions of adipic acid are taken in sequence, heated, stirred and reacted, and the solvent is removed by reduced pressure distillation, so that the waterborne epoxy resin is obtained.
7. The preparation process of the molecular sieve coated aluminum foil with the anticorrosion function, according to claim 5, is characterized by comprising the following specific preparation steps:
modification of the molecular sieve:
according to the weight portion, 10-15 portions of nano silicon dioxide, 3-5 portions of silane coupling agent and 100 portions of ethanol solution are taken in sequence, and after mixing, the nano silicon dioxide dispersion liquid is obtained by heating, stirring and reacting; and then mixing the obtained nano silicon dioxide dispersion liquid with a molecular sieve according to the mass ratio of 5: 1-10: 1, filtering, washing and drying after mixing reaction to obtain the modified molecular sieve;
preparing a water-based epoxy resin emulsion:
according to the weight parts, 80-100 parts of water, 40-60 parts of waterborne epoxy resin, 80-100 parts of cyclohexane, 4-10 parts of polyethyleneimine and 4-10 parts of modified molecular sieve are taken in sequence, stirred and mixed uniformly, and carbon dioxide gas is continuously introduced in the stirring process to obtain waterborne epoxy resin emulsion;
reduction of copper ions:
adding a copper salt solution with the mass of 10-20% of that of the aqueous epoxy resin emulsion into the aqueous epoxy resin emulsion, adding a reducing agent, heating, stirring, reacting, and concentrating under reduced pressure to obtain a concentrated solution;
coating of a coating:
coating the concentrated solution on the surface of the aluminum foil, and controlling the thickness of the coating film to be 100-200 mu m.
8. The process for preparing the molecular sieve coated aluminum foil with the corrosion prevention function according to any one of claims 5 to 7, wherein the epoxy resin is any one of epoxy resin E-42, epoxy resin E-41 and epoxy resin E-51.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114058241A (en) * | 2021-11-30 | 2022-02-18 | 江苏金天辰新材料有限公司 | Composite aluminum foil externally attached with epoxy resin coating and processing method thereof |
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