CN110842479A - Marble aluminum plate forming process - Google Patents

Marble aluminum plate forming process Download PDF

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Publication number
CN110842479A
CN110842479A CN201911142306.XA CN201911142306A CN110842479A CN 110842479 A CN110842479 A CN 110842479A CN 201911142306 A CN201911142306 A CN 201911142306A CN 110842479 A CN110842479 A CN 110842479A
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China
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parts
aluminum plate
aluminum
coating
forming
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CN201911142306.XA
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Inventor
刘露
于亚民
韦茂忠
何世发
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Anhui Furuier Aluminium Technology Co Ltd
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Anhui Furuier Aluminium Technology Co Ltd
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Priority to CN201911142306.XA priority Critical patent/CN110842479A/en
Publication of CN110842479A publication Critical patent/CN110842479A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23PMETAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/02Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
    • B05D3/0254After-treatment
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/06Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation
    • B05D3/061Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation using U.V.
    • B05D3/065After-treatment
    • B05D3/067Curing or cross-linking the coating
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/12Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by mechanical means
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/06Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain multicolour or other optical effects
    • B05D5/065Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain multicolour or other optical effects having colour interferences or colour shifts or opalescent looking, flip-flop, two tones
    • B05D5/066Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain multicolour or other optical effects having colour interferences or colour shifts or opalescent looking, flip-flop, two tones achieved by multilayers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/14Processes, 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/50Multilayers
    • B05D7/56Three layers or more
    • B05D7/57Three layers or more the last layer being a clear coat
    • B05D7/576Three layers or more the last layer being a clear coat each layer being cured, at least partially, separately
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING 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
    • C09D127/00Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers
    • C09D127/02Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
    • C09D127/12Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING 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
    • C09D163/00Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING 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
    • C09D183/00Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
    • C09D183/04Polysiloxanes
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING 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
    • C09D5/00Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/002Priming paints
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING 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
    • C09D7/00Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40Additives
    • C09D7/60Additives non-macromolecular
    • C09D7/61Additives non-macromolecular inorganic
    • CCHEMISTRY; METALLURGY
    • C23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23GCLEANING OR DEGREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/02Cleaning or pickling metallic material with solutions or molten salts with acid solutions
    • C23G1/12Light metals
    • C23G1/125Light metals aluminium
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2202/00Metallic substrate
    • B05D2202/20Metallic substrate based on light metals
    • B05D2202/25Metallic substrate based on light metals based on Al
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2504/00Epoxy polymers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2506/00Halogenated polymers
    • B05D2506/10Fluorinated polymers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2518/00Other type of polymers
    • B05D2518/10Silicon-containing polymers
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00Use of inorganic substances as compounding ingredients
    • C08K3/18Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/24Acids; Salts thereof
    • C08K3/26Carbonates; Bicarbonates
    • C08K2003/265Calcium, strontium or barium carbonate
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00Use of inorganic substances as compounding ingredients
    • C08K3/30Sulfur-, selenium- or tellurium-containing compounds
    • C08K2003/3045Sulfates
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00Specific properties of additives
    • C08K2201/011Nanostructured additives
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00Polymer mixtures characterised by other features
    • C08L2205/03Polymer mixtures characterised by other features containing three or more polymers in a blend

Abstract

The invention discloses a forming process of a marbled aluminum plate, which comprises the steps of sheet metal preparation, surface pretreatment, primer layer treatment, finish layer treatment, varnish layer treatment, transfer printing of marbleizing to the surface of the aluminum plate, coating of a layer of UV (ultraviolet) roller coating and drying to obtain the marbled aluminum plate. The invention adopts the acid etching degreasing agent to pretreat the surface of the aluminum plate, keeps the original luster of the surface of the aluminum plate, ensures that the dissolution loss of the aluminum material and the precipitation of bath solution are less, and has good matching performance with chromate conversion treatment; secondly, with panel beating spraying fluorine carbon series water based paint for aluminum plate has durability and the advantage that the gloss retention, the color retention are good, at the coating nanometer modification photocuring coating of priming paint layer surface spraying, effectively promoted coating material to aluminum plate's bonding, adhesion properties, the spraying weatherability coating on the clear coat layer provides good adhesive force for marble line heat-transfer seal technology, makes whole marble line aluminum plate have advantages such as the weatherability is good, long service life.

Description

Marble aluminum plate forming process
Technical Field
The invention relates to the technical field of building decoration materials, in particular to a forming process of a marbled aluminum plate.
Background
The development of the aluminum-plastic panel industry for more than ten years now becomes the inner and outer walls of domestic large buildings, landmark buildings and high-grade residential buildings, the process is mature, the production scale is large, the construction is simple, the appearance is various, and the market prospect is on the rise and immeasurable.
With the development of times and the great leap of urban construction, the consumption level of residents rises in pace with the taste of life, and the traditional aluminum-plastic plate with simple appearance, single color and stuffiness is difficult to meet the requirements of people on high-quality comfortable life. People are looking for a warm and leisure living environment without losing elegance, and individual extension is strongly sought. But if the marble material is used for decorating the outer wall, the marble material is unsafe because of being too heavy. Thus, marbled aluminum panels are gaining increasing popularity. The application of the marbling aluminum plate on the building not only improves the elegant high-end atmosphere of the outer wall surface of the building, but also can not cause construction difficulty due to heaviness. At present, the existing marbling aluminum plate is mostly an aluminum plate which is machined and then is printed with marbling, so that the aluminum plate with the marbling can be manufactured. However, in the actual manufacturing process, due to the poor manufacturing process and improper selection of the spraying material, the service performance of the marbled aluminum plate is low, and the phenomena of fading, paint removal and the like are easy to occur in the long-term wind-blowing and sun-drying process.
Disclosure of Invention
The invention aims to provide a marbling aluminum plate forming process which has the advantages of good weather resistance, strong adhesion, difficult decolorization, long service life and the like, and solves the problems in the background art.
In order to achieve the purpose, the invention provides the following technical scheme:
a forming process of a marbled aluminum plate comprises the following steps:
s1: preparing a metal plate; selecting an aluminum veneer with the thickness of 3-5mm to carry out sheet metal processing, wherein the processing steps comprise plate shearing and blanking, scribing and angle opening, angle punching and hole stacking, bending and forming, welding and splicing, reinforcing rib adding, laser punching, and grinding and polishing;
s2: surface pretreatment: polishing the sprayed surface by using an air mill to remove oxide skin, performing oil removal treatment by using an acid etching degreasing agent, and washing the surface of the aluminum veneer by using tap water until water drops are not hung, wherein the oil removal is regarded as thorough and clean;
s3: primer layer treatment: spraying fluorocarbon series water-based paint on the metal plate, and preheating for 15 minutes at 60-80 ℃ after spraying;
s4: finishing paint layer treatment: spraying a nano modified photocureable coating on the surface of the primer layer treated by the S3 procedure, and irradiating by using an ultraviolet curing box;
s5: and (3) varnish layer treatment: spraying weather-resistant paint, and baking at the temperature of 120-;
s6: at high temperature, the strength is 5kg/m3Transferring the marbling of the marbling heat transfer film to the surface of the aluminum plate;
s7: and coating a layer of UV roller coating on the surface of the marbling on the transfer-printed aluminum plate, and drying to obtain the marbling aluminum plate.
Furthermore, the acid etching degreasing agent in the S2 is prepared from the following raw materials in parts by weight: sulfuric acid: 30g/L-50 g/L; ammonium acid fluoride: 3g/L-8 g/L; citric acid: 2g/L-4 g/L; sodium nitrate: 1g/L-3 g/L; iron sulfate: 0.5g/L-1.5 g/L; dipropylene glycol: 1g/L-2 g/L; surfactant (b): 0.1g/L-0.5 g/L.
Furthermore, ammonium bifluoride, citric acid, sodium nitrate, ferric sulfate, dipropylene glycol and a surfactant are sequentially and slowly added into sulfuric acid according to the mass fraction ratio and uniformly stirred to obtain the acid etching degreasing agent.
Furthermore, the fluorocarbon series water-based paint in S3 is prepared from the following raw materials in parts by weight: 70% of water-based fluorocarbon resin, 10% of amino resin, 10% of film-forming assistant, 2% of defoaming agent and 8% of water.
Further, the aqueous fluorocarbon resin, the amino resin, the film forming assistant, the defoaming agent and the water are weighed according to the mass fraction ratio, stirred uniformly and filtered to obtain the primer layer of the fluorocarbon-containing aqueous coating in S3.
Furthermore, the nano modified photocureable coating in the S4 is prepared from the following raw materials in parts by weight: 50 parts of modified isocyanate, 5 parts of catalyst, 15 parts of siloxane-based phosphate, 1 part of auxiliary agent, 35 parts of potassium silicate, 70 parts of deionized water and 0.5 part of surfactant.
Further, adding the modified isocyanate into a dispersion kettle, sequentially adding the catalyst and the siloxane-based phosphate ester, uniformly stirring, adding the auxiliary agent, uniformly stirring, adding the potassium silicate into deionized water, dissolving until the solution is clear and transparent, filtering, adding the filtered solution into the dispersion kettle, and uniformly mixing to obtain the nano modified photocuring coating finish paint in S4.
Further, S5: the medium weather-resistant coating is prepared from the following raw materials in parts by weight: 15 parts of modified polysiloxane resin, 25 parts of aqueous silica sol, 15 parts of epoxy resin, 8 parts of precipitated barium sulfate, 8 parts of calcined kaolin, 15 parts of nano calcite powder, 2 parts of hydroxypropyl methyl cellulose, 2 parts of defoaming agent, 2 parts of wetting agent, 4 parts of dispersing agent, 3 parts of flatting agent and 40 parts of water.
Further, the modified polysiloxane resin, the water-based silica sol, the epoxy resin, the precipitated barium sulfate, the calcined kaolin, the nano calcite powder, the hydroxypropyl methyl cellulose, the defoaming agent, the wetting agent, the dispersing agent, the leveling agent and the water are sequentially mixed and stirred uniformly in a stirring kettle, and the clear paint layer containing the weather-resistant paint in S5 is obtained.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention provides a marbling aluminum plate forming process, which adopts acid-etching degreasing agent to pretreat the surface of an aluminum plate, combines three procedures of degreasing, alkali etching and decontamination polishing of the traditional process into one procedure, reduces the cost and saves energy, the surface of the aluminum plate after treatment is smooth and clean, the original luster of the surface of the aluminum plate is kept, the dissolution loss of the aluminum material and the precipitation of bath solution are less, and the matching performance with chromate conversion treatment is good.
2. According to the forming process of the marbled aluminum plate, the metal plate is sprayed with the fluorocarbon series water-based paint, so that the aluminum plate has the advantages of durability, light retention and good color retention, has obvious advantages in the aspects of cleaning maintenance, appearance retention and the like, and prolongs the service life of the aluminum plate on buildings.
3. According to the forming process of the marbled aluminum plate, the nano-modified photocuring coating is sprayed on the surface of the primer layer, so that the bonding and adhesion properties of the coating material to the aluminum plate are effectively improved, and the comprehensive properties of the paint film, such as salt spray resistance, weather resistance, toughness and the like, are improved.
4. According to the forming process of the marbled aluminum plate, the weather-resistant coating is sprayed on the clear paint layer, so that good adhesion capability is provided for the marbled heat transfer printing process, and the whole marbled aluminum plate has the advantages of good weather resistance, long service life and the like.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in 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.
Referring to fig. 1, in the embodiment of the present invention: the forming process of the marbled aluminum plate comprises the following steps:
the first step is as follows: preparing a metal plate; selecting an aluminum veneer with the thickness of 3-5mm to carry out sheet metal processing, wherein the processing steps comprise plate shearing and blanking, scribing and angle opening, angle punching and hole stacking, bending and forming, welding and splicing, reinforcing rib adding, laser punching and grinding and polishing, and the working procedure is a conventional machining operation means and is not repeated;
the second step is that: surface pretreatment: polishing the sprayed surface by using an air mill to remove oxide skin, performing oil removal treatment by using an acid etching degreasing agent, and washing the surface of the aluminum veneer by using tap water until water drops are not hung, wherein the oil removal is regarded as thorough and clean; the acid etching degreasing agent is prepared from the following raw materials in parts by weight: sulfuric acid: 30g/L-50 g/L; ammonium acid fluoride: 3g/L-8 g/L; citric acid: 2g/L-4 g/L; sodium nitrate: 1g/L-3 g/L; iron sulfate: 0.5g/L-1.5 g/L; dipropylene glycol: 1g/L-2 g/L; surfactant (b): 0.1g/L-0.5 g/L; ammonium bifluoride, citric acid, sodium nitrate, ferric sulfate, dipropylene glycol and a surfactant are sequentially and slowly added into sulfuric acid according to the mass fraction ratio and uniformly stirred to obtain the acid etching degreasing agent;
the third step: primer layer treatment: spraying fluorocarbon series water-based paint on the metal plate, and preheating for 15 minutes at 60-80 ℃ after spraying; the fluorocarbon series water-based paint is prepared from the following raw materials in parts by mass: 70% of aqueous fluorocarbon resin, 10% of amino resin, 10% of film-forming assistant, 2% of defoaming agent and 8% of water; weighing the aqueous fluorocarbon resin, the amino resin, the film-forming assistant, the defoaming agent and water according to the mass fraction ratio, uniformly stirring and filtering to obtain a primer layer of the fluorocarbon-containing series aqueous coating;
the fourth step: finishing paint layer treatment: spraying a nano modified photocureable coating on the surface of the primer layer treated by the three steps, and irradiating by using an ultraviolet curing box; the nano modified photocureable coating is prepared from the following raw materials in parts by weight: 50 parts of modified isocyanate, 5 parts of catalyst, 15 parts of siloxane-based phosphate, 1 part of auxiliary agent, 35 parts of potassium silicate, 70 parts of deionized water and 0.5 part of surfactant; adding modified isocyanate into a dispersion kettle, sequentially adding a catalyst and siloxane-based phosphate, uniformly stirring and adding an auxiliary agent, uniformly stirring, adding potassium silicate into deionized water to dissolve until the solution is clear and transparent, filtering, adding the filtered solution into the dispersion kettle, and uniformly mixing to obtain the nano modified photocuring coating finish paint in the fourth step;
the fifth step: and (3) varnish layer treatment: spraying weather-resistant paint, and baking at the temperature of 120-; the weather-resistant coating is prepared from the following raw materials in parts by weight: 15 parts of modified polysiloxane resin, 25 parts of aqueous silica sol, 15 parts of epoxy resin, 8 parts of precipitated barium sulfate, 8 parts of calcined kaolin, 15 parts of nano calcite powder, 2 parts of hydroxypropyl methyl cellulose, 2 parts of defoaming agent, 2 parts of wetting agent, 4 parts of dispersing agent, 3 parts of flatting agent and 40 parts of water; sequentially mixing and stirring modified polysiloxane resin, water-based silica sol, epoxy resin, precipitated barium sulfate, calcined kaolin, nano calcite powder, hydroxypropyl methyl cellulose, a defoaming agent, a wetting agent, a dispersing agent, a flatting agent and water in a stirring kettle to obtain a varnish layer containing the weather-resistant coating in S5;
and a sixth step: at high temperature, the strength is 5kg/m3Transferring the marbling of the marbling heat transfer film to the surface of the aluminum plate;
the seventh step: and coating a layer of UV roller coating on the surface of the marbling on the transfer-printed aluminum plate, and drying to obtain the marbling aluminum plate.
In the above examples, in the second step, the acid-etching degreasing agent: the sulfuric acid is a non-oxidizing inorganic acid, has slight chemical etching effect on the aluminum alloy section, and has lower use cost and less acid mist volatility; the sulfuric acid can dissolve and strip the natural oxide film formed on the surface of the aluminum and the aluminum alloy; the bare aluminum alloy matrix reacts with sulfuric acid to activate the aluminum surface; when the sulfuric acid concentration in the bath solution is lower than 30%, the chemical dissolution speed of aluminum is slowly increased along with the increase of the sulfuric acid concentration, and the loss of aluminum dissolution is small; when the sulfuric acid concentration in the bath solution exceeds 30%, the corrosion speed of aluminum is rapidly accelerated, over-corrosion is easy to generate, and the brightness is reduced, generally speaking, the sulfuric acid concentration in the bath solution is not suitable to exceed 15%;
wherein, the ammonium bifluoride fluoride ion is used as an accelerator for removing an oxidation film in the acid etching degreasing liquid, so that the dissolution of the oxidation film on the surface of the aluminum can be accelerated, and extrusion die marks and other defects can be eliminated or reduced, so that the surface of the aluminum profile is smooth, clean, uniform and consistent; fluorine is a halogen element with small volume and strong electronegativity, can play a strong oxidation role on aluminum, has certain complexing ability with impurities, can dissolve alloy elements such as manganese, copper, silicon and the like and impurities on the surface of the aluminum alloy, inhibit and remove black hanging ash on the aluminum material, and obtain a bright metal surface; the chemical stability of the ammonium bifluoride is stronger than that of hydrofluoric acid, and the damage effect on human skin is less than that of the hydrofluoric acid, so that the ammonium bifluoride is adopted to replace the hydrofluoric acid to provide fluoride ions for the solution, the use is safer in production, the corrosion of the fluoride ions to stainless steel equipment can be reduced, the corrosion speed of removing an oxidation film is increased along with the increase of the concentration of the ammonium bifluoride, the content of the ammonium bifluoride is not too high, otherwise, the reaction is violent, the over-corrosion is easily caused, the surface gloss of aluminum is reduced, and the subsequent chromate conversion treatment is not facilitated;
citric acid mainly plays a role in inhibiting corrosion in acid-etching degreasing liquid, can effectively inhibit the corrosion of aluminum in an acidic medium, is a ternary organic acid, can carry out physical and chemical adsorption on the surface of an aluminum matrix, changes the double electric layer structure of a metal/solution interface, and increases the activation energy in the metal ionization process, so that the corrosion speed is reduced, the loss of aluminum materials is reduced, and the over-corrosion is avoided; citric acid is a complexing agent of metal ions, can form a stable complex with aluminum, magnesium, iron and other ions dissolved from the acid etching solution, reduces the content of aluminum ions in the bath solution, masks the interference of impurities in the bath solution, stabilizes the solution and reduces precipitation, thereby prolonging the service life of the acid etching degreasing solution.
The sodium nitrate is an oxidant in the acid etching degreasing liquid, has good brightening and leveling effects on the aluminum alloy, and has the function of enabling the surface of the aluminum material to generate oxidation reaction, so that the formed aluminum oxide passivation film inhibits the acid preferential etching of the concave part of the aluminum surface, and the etched surface of the aluminum material is flat, smooth and clean.
Ferric sulfate ferric iron ions can accelerate corrosion of the surface of the aluminum profile and remove an oxide film, Fe3+Can generate displacement reaction on the surface of the aluminum material to form a micro-battery, so that trace hydrogen is generated on the surface of the aluminum, oil stains are taken out of the surface of the aluminum, and the reaction process is AL + Fe3++2H+→AL3++Fe2+++H2×) ×; the oxidant in the bath solution can react the Fe produced by the reaction2+Reoxidation to Fe3+Reduction of Fe2+To stabilize the bath solution, thus Fe3+The aluminum material is not consumed in the reaction process, mainly plays a promoting role, and can improve the decontamination speed and the smoothness of the aluminum material.
The dipropylene glycol is added into the acid-etching degreasing fluid with organic low-molecular solubilizer which is easily dissolved in water and slightly toxic, such as the dipropylene glycol, and the like, so that the surface tension of the solution can be greatly reduced, the cleaning capability and the solution stability of the acid-etching degreasing fluid can be remarkably improved, the molecular structure of the grease has longer alkyl groups, is similar to the structure of the organic solvent, and can be mutually dissolved, and therefore, the degreasing effect of the acid-etching degreasing fluid can be improved by utilizing the characteristic that the organic solvent has strong dissolving capability on the grease.
The oil on the surface of the degreasing agent aluminum material can be generally divided into two types of mineral oil and animal and vegetable oil, the surfactant has good wetting and emulsifying capacity on the oil, in the acid etching degreasing process, the surfactant is adsorbed on the interface of oil and solution, the hydrophilic gene of the surfactant points to the solution, the lipophilic gene of the surfactant points to oil stain and is directionally arranged, so that the interfacial tension of the oil and the solution is greatly reduced, the adhesive force of the oil on the metal surface is weakened, under the mechanical stripping action of hydrogen generated by acid corrosion of metal, the oil stain is loosened and easily dispersed into tiny oil beads which are separated from the metal surface and suspended in the solution, the solubilization of the surfactant can prevent the removed oil stain from being adhered to the surface of the aluminum material, and the key for improving the degreasing efficiency at normal temperature is the selection and proportioning optimization of the surfactant, and the 7jL6 hardware spraying aluminum plate spraying process should be carried out according to the surface tension of the surfactant, Cloud point, critical micelle concentration and hydrophile-lipophile balance value (HLB value), a plurality of anionic and nonionic surfactants which have good oil stain adsorption, wettability and dispersibility, particularly strong permeability and emulsifying power, less foam and good biodegradability and stable performance in an acidic solution are selected for compounding, and the HLB value is adjusted to 12-16 during compounding so as to be suitable for the range of solution cleaning; the synergistic effect of the two can achieve the purposes of mutual compensation and synergy after compounding, so that the surface tension and the critical micelle concentration of the solution are reduced, the cloud point is increased, the surface activity is increased, and the wettability and the cleaning effect are obviously improved; when the spray mode is adopted for acid etching degreasing, a large amount of foam is generated under the action of mechanical force, so that a large amount of solution overflows from the tank in the form of foam, and a proper amount of defoaming agent is added to inhibit the generation of foam.
In the embodiment, the sheet metal is sprayed with the fluorocarbon series water-based paint in the third step, so that the aluminum plate has the advantages of durability, light retention and good color retention, the aluminum plate has obvious advantages in the aspects of cleaning maintenance, appearance retention and the like, and the service life of the aluminum plate on a building is prolonged.
In the embodiment, the nano-modified photocuring coating is sprayed on the surface of the primer layer in the fourth step, so that the bonding and adhesion properties of the coating material to the aluminum plate are effectively improved, and the comprehensive properties of the paint film, such as salt spray resistance, weather resistance, toughness and the like, are improved.
In the above embodiment, the weather-resistant coating is sprayed in the fifth step, so as to provide good adhesion for the marbling heat transfer printing process, and the whole aluminum plate has the characteristics of good weather resistance and long service life.
In summary, the following steps: the invention provides a marbling aluminum plate forming process, which adopts acid-etching degreasing agent to pretreat the surface of an aluminum plate, combines three procedures of degreasing, alkali etching and decontamination polishing of the traditional process into one procedure, reduces the cost and saves energy, the surface of the aluminum plate after treatment is smooth and clean, the original luster of the surface of the aluminum plate is kept, the dissolution loss of the aluminum material and the precipitation of bath solution are less, and the matching performance with chromate conversion treatment is good; secondly, the metal plate is sprayed with fluorocarbon series water-based paint, so that the aluminum plate has the advantages of durability, light retention and good color retention, has obvious advantages in the aspects of cleaning maintenance, appearance retention and the like, and prolongs the service life of the aluminum plate on buildings; in addition, the nano modified photocureable coating is sprayed on the surface of the primer layer, so that the bonding and adhesion properties of the coating material to the aluminum plate are effectively improved, and the comprehensive properties of the paint film, such as salt spray resistance, weather resistance, toughness and the like, are improved; and the coating is also sprayed with weather-resistant coating, so that good adhesion capability is provided for a marbling heat transfer printing process, and the whole aluminum plate has the advantages of good weather resistance, long service life and the like.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.

Claims (9)

1. A marbling aluminum plate forming process is characterized by comprising the following steps:
s1: preparing a metal plate; selecting an aluminum veneer with the thickness of 3-5mm to carry out sheet metal processing, wherein the processing steps comprise plate shearing and blanking, scribing and angle opening, angle punching and hole stacking, bending and forming, welding and splicing, reinforcing rib adding, laser punching, and grinding and polishing;
s2: surface pretreatment: polishing the sprayed surface by using an air mill to remove oxide skin, performing oil removal treatment by using an acid etching degreasing agent, and washing the surface of the aluminum veneer by using tap water until water drops are not hung, wherein the oil removal is regarded as thorough and clean;
s3: primer layer treatment: spraying fluorocarbon series water-based paint on the metal plate, and preheating for 15 minutes at 60-80 ℃ after spraying;
s4: finishing paint layer treatment: spraying a nano modified photocureable coating on the surface of the primer layer treated by the S3 procedure, and irradiating by using an ultraviolet curing box;
s5: and (3) varnish layer treatment: spraying weather-resistant paint, and baking at the temperature of 120-;
s6: at high temperature, the strength is 5kg/m3Transferring the marbling of the marbling heat transfer film to the surface of the aluminum plate;
s7: and coating a layer of UV roller coating on the surface of the marbling on the transfer-printed aluminum plate, and drying to obtain the marbling aluminum plate.
2. The forming process of marble aluminum plate as claimed in claim 1, wherein the acid-etching degreasing agent in S2 is prepared from the following raw materials in parts by weight: sulfuric acid: 30g/L-50 g/L; ammonium acid fluoride: 3g/L-8 g/L; citric acid: 2g/L-4 g/L; sodium nitrate: 1g/L-3 g/L; iron sulfate: 0.5g/L-1.5 g/L; dipropylene glycol: 1g/L-2 g/L; surfactant (b): 0.1g/L-0.5 g/L.
3. The forming process of a marbled aluminum panel as claimed in claim 2, wherein ammonium bifluoride, citric acid, sodium nitrate, ferric sulfate, dipropylene glycol and surfactant are sequentially and slowly added to sulfuric acid according to the mass fraction ratio and uniformly stirred to obtain the acid-etched degreasing agent.
4. The forming process of a marbled aluminum plate as set forth in claim 1, wherein the fluorocarbon series water-based paint in S3 is prepared from the following raw materials in parts by mass: 70% of water-based fluorocarbon resin, 10% of amino resin, 10% of film-forming assistant, 2% of defoaming agent and 8% of water.
5. The forming process of a marbled aluminum panel as claimed in claim 4, wherein the primer layer of the fluorocarbon-containing aqueous coating in S3 is obtained by weighing the aqueous fluorocarbon resin, the amino resin, the film-forming assistant, the defoamer and the water in parts by mass, stirring uniformly and filtering.
6. The forming process of marble aluminum plate as claimed in claim 1, wherein the nano-modified photocured coating in S4 is prepared from the following raw materials in parts by weight: 50 parts of modified isocyanate, 5 parts of catalyst, 15 parts of siloxane-based phosphate, 1 part of auxiliary agent, 35 parts of potassium silicate, 70 parts of deionized water and 0.5 part of surfactant.
7. The forming process of a marbled aluminum panel as claimed in claim 6, wherein the modified isocyanate is added into a dispersion kettle, the catalyst and the siloxane-based phosphate are sequentially added, the auxiliary agent is added after the stirring and the mixing are carried out, the potassium silicate is added into deionized water after the stirring and the mixing are carried out, the potassium silicate is dissolved until the solution is clear and transparent, the solution is filtered, the filtered solution is added into the dispersion kettle and the mixing is carried out, and then the nano modified photocuring coating finish paint in S4 is obtained.
8. The forming process of marbled aluminum panels as claimed in claim 1, wherein the ratio of S5: the medium weather-resistant coating is prepared from the following raw materials in parts by weight: 15 parts of modified polysiloxane resin, 25 parts of aqueous silica sol, 15 parts of epoxy resin, 8 parts of precipitated barium sulfate, 8 parts of calcined kaolin, 15 parts of nano calcite powder, 2 parts of hydroxypropyl methyl cellulose, 2 parts of defoaming agent, 2 parts of wetting agent, 4 parts of dispersing agent, 3 parts of flatting agent and 40 parts of water.
9. The forming process of a marbled aluminum panel as claimed in claim 8, wherein the modified polysiloxane resin, the aqueous silica sol, the epoxy resin, the precipitated barium sulfate, the calcined kaolin, the nano calcite powder, the hydroxypropyl methyl cellulose, the defoamer, the wetting agent, the dispersant, the leveling agent and the water are sequentially mixed and stirred uniformly in a stirring kettle to obtain the clear paint layer containing the weather-resistant paint in S5.
CN201911142306.XA 2019-11-20 2019-11-20 Marble aluminum plate forming process Pending CN110842479A (en)

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CN111496002A (en) * 2020-05-08 2020-08-07 广东湘珠建材科技有限公司 Forming process for aluminum plate
CN111945974A (en) * 2020-08-19 2020-11-17 江苏凯丰幕墙材料有限公司 Manufacturing method of environment-friendly aluminum veneer
CN112588545A (en) * 2020-11-05 2021-04-02 安徽墙煌彩铝科技有限公司 Spraying process of non-rectangular grain multicolor aluminum plate
CN112974192A (en) * 2021-02-04 2021-06-18 杭州罗维标识系统工程有限公司 Preparation process of signboard

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CN112974192A (en) * 2021-02-04 2021-06-18 杭州罗维标识系统工程有限公司 Preparation process of signboard

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