CN111604248A - Production process of color-coated aluminum coil - Google Patents
Production process of color-coated aluminum coil Download PDFInfo
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- CN111604248A CN111604248A CN202010552470.4A CN202010552470A CN111604248A CN 111604248 A CN111604248 A CN 111604248A CN 202010552470 A CN202010552470 A CN 202010552470A CN 111604248 A CN111604248 A CN 111604248A
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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
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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
- B05D3/00—Pretreatment 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
- B05D3/002—Pretreatement
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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
- B05D3/00—Pretreatment 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
- B05D3/02—Pretreatment 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
- B05D3/0254—After-treatment
- B05D3/0272—After-treatment with ovens
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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
- B05D3/00—Pretreatment 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
- B05D3/10—Pretreatment 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 other chemical means
- B05D3/102—Pretreatment of metallic substrates
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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
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
- B05D5/06—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain multicolour or other optical effects
- B05D5/065—Processes 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
- B05D5/066—Processes 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
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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
- B05D7/50—Multilayers
- B05D7/52—Two layers
- B05D7/54—No clear coat specified
- B05D7/542—No clear coat specified the two layers being cured or baked together
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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
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
- C09D175/14—Polyurethanes having carbon-to-carbon unsaturated bonds
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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
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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
- C09D7/63—Additives non-macromolecular organic
-
- 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
- B05D2301/00—Inorganic additives or organic salts thereof
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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
- B05D2320/00—Organic additives
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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
- B05D2502/00—Acrylic polymers
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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
- B05D2503/00—Polyurethanes
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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
- 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
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
Abstract
The invention belongs to the technical field of color aluminum production and processing, and particularly relates to a production process of a color-coated aluminum coil. The production process of the color-coated aluminum coil provided by the invention comprises the following steps: s1, inputting a raw material roll; s2, preprocessing; s3, rolling a coating; s4, baking, solidifying and cooling. The color-coated aluminum coil provided by the invention has the advantages that the production process is simple and easy to operate, the color-coated aluminum coil obtained by the production process is more stable in performance, has extraordinary wear resistance and impact resistance, and can resist fading and ultraviolet irradiation for a long time especially in extreme weather and severe weather.
Description
Technical Field
The invention belongs to the technical field of color aluminum production and processing, and particularly relates to a production process of a color-coated aluminum coil.
Background
The color aluminum has the advantages of light weight, bright color, easy forming, no rustiness and the like, and is widely applied to the fields of heat-insulating boards, aluminum curtain walls, aluminum-magnesium-manganese roof systems, aluminum ceilings and the like. The coated aluminum coil refers to a product with color roller coating effect on the surface of the aluminum coil, and can be also called as a color coated aluminum coil or a color printed aluminum coil. The coating treatment is carried out for the purpose of achieving an attractive effect in the fields of building, decoration and the like; secondly, the coating process and the coating thickness are directly related to the product quality and the service life of the coated aluminum coil.
The color-coated aluminum coil has rich color range, and can be used for increasing the color of the color-coated aluminum coil regardless of a residential house, a large commercial site or a large exhibition center. The good plasticity and the mechanical processing performance make the material become an ideal material for various building models. Color-coated aluminum coils have provided architects, designers, and owners with a color space to achieve personalized exterior walls and ceilings, and are also the most desirable material for architectural styling. The product is applied to a plurality of fields such as electronic appliances, instruments, lamp decorations, packages, home furnishings and the like. With the appearance of color-coated aluminum plates, metal roofs and walls are provided with higher-grade and more ideal maintenance materials.
The color-coated aluminum coil can be simply divided into several types because the processing process is different from the use purpose: the paint can be classified into: polyester (PE) coating aluminum coils, fluorocarbon (PVDF) coating aluminum coils and epoxy roller coating aluminum coils; the thickness of the coating can be divided into single coating (10um-19um), double coating (25um-28um) and triple coating (35um-38um), the patterns on the surface are various, and the coating is also called wood grain aluminum roll, stone grain aluminum roll, brick grain, camouflage aluminum roll and the like; because of different purposes, the material is also commonly called roof material (aluminum magnesium manganese roofing system), ceiling material (aluminum alloy ceiling), wire drawing plate (with the surface subjected to wire drawing treatment) and the like.
The Chinese patent application CN 110976253A discloses a color coating production process for an aluminum plate, which comprises the steps of uncoiling, sewing, pretreatment of aluminum coil coating, roller coating, baking, curing, cooling, coiling, packaging, warehousing and the like. In the process of preparing the coated aluminum coil, the surface treatment of the aluminum material is carried out by degreasing mainly in an alkali washing or acid washing mode. And after the surface is treated, the conventional preparation of the coating aluminum coil is carried out, so that the film adhesion of the obtained coating aluminum coil is poor, and the product quality is unstable.
Therefore, a production process of the color-coated aluminum coil needs to be researched, so that the obtained color-coated aluminum coil has the advantages of uniform color, high gloss, full surface and more stable quality, the adhesive force of the coating is improved, and higher strength and weather resistance are ensured in a severe environment.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a production process of a color-coated aluminum coil. The color-coated aluminum coil obtained by the production process provided by the invention has more stable performance, extraordinary wear resistance and impact resistance, and can resist fading and ultraviolet irradiation for a long time especially in extreme weather and severe weather.
The technical scheme of the invention is as follows:
a production process of a color-coated aluminum coil comprises the following steps:
s1, raw material roll input: the aluminum coil is opened by using the uncoiler to continuously rotate, so that the continuous and stable input of the coil into a production line is ensured;
s2, preprocessing: cleaning and chemically pretreating the upper and lower surfaces of the aluminum coil, and then drying;
s3, roll coating: carrying out primer roller coating and finish roller coating on the aluminum coil obtained in the step S2; the primer and the finish are composite fluorocarbon coatings;
s4, baking, solidifying and cooling: and (5) baking the liquid coating coated on the surface of the aluminum coil in the step S3 by using an oven, then finishing curing, and controlling the temperature of the oven after curing to realize cooling of the coating, thereby obtaining the color-coated aluminum coil.
Further, the chemical pretreatment in step S2 is a degreasing treatment.
Further, the temperature of the degreasing treatment in the step S2 is 45-70 ℃, and the time of the degreasing treatment is 10-20S.
Further, the composite fluorocarbon coating in step S3 includes the following components in parts by weight: 30-40 parts of urethane acrylate, 2-6 parts of epoxidized polybutadiene resin, 3-9 parts of titanium dioxide, 4-8 parts of triglycidyl isocyanurate, 1-4 parts of alcohol ester and 50400.2-0.6 part of dispersing agent.
Further, the composite fluorocarbon coating in step S3 is composed of the following components in parts by weight: 35 parts of urethane acrylate, 4 parts of epoxidized polybutadiene resin, 6 parts of titanium dioxide, 5 parts of triglycidyl isocyanurate, twelve 3 parts of alcohol ester and 50400.4 parts of dispersing agent.
Further, the preparation method of the composite fluorocarbon coating in step S3 is as follows:
the method comprises the following steps: crushing and premixing urethane acrylate, epoxidized polybutadiene resin, titanium dioxide and triglycidyl isocyanurate;
step two: melting and mixing the premixed raw materials by using an extruder, uniformly dispersing, and performing melt extrusion to obtain a mixture;
step three: and (3) adding the alcohol ester dodeca and the dispersing agent 5040 into the mixture obtained in the second step, uniformly dispersing, tabletting, cooling and crushing the extruded material, and finely crushing the crushed material to obtain the water-based oil-based.
Further, the curing temperature in the oven in the step S4 is 241 ℃ to 260 ℃.
Compared with the prior art, the color-coated aluminum coil prepared by the production process has the following advantages:
(1) the color-coated aluminum coil prepared by the production process can ensure that the product has uniform color, high gloss, full surface and no stripe spot, and ensures higher strength and weather resistance in severe environment.
(2) The color-coated aluminum coil prepared by the production process disclosed by the invention is rigid-tough combined, has extremely high plate surface strength, and can be cut, stripped, bent, pressed by balance, drilled, connected and fixed and subjected to edge compression molding at will.
(3) The composite fluorocarbon coating adopted by the color-coated aluminum roll prepared by the production process of the color-coated aluminum roll provided by the invention has the characteristics of strong adhesive force, oxidation resistance, acid resistance, strong alkalinity, aging resistance, ultraviolet irradiation resistance and the like, can obtain a coating with very good surface appearance leveling property, and greatly improves the decorative effect.
Detailed Description
The present invention is further illustrated by the following description of specific embodiments, which are not intended to limit the invention, and various modifications and improvements can be made by those skilled in the art based on the basic idea of the invention, but the invention is within the protection scope of the invention.
Wherein, the reagents used in the invention are all common reagents and can be purchased from common reagent production and sale companies.
Example 1 production process of color-coated aluminum coil
A production process of a color-coated aluminum coil comprises the following steps:
s1, raw material roll input: the aluminum coil is opened by using the uncoiler to continuously rotate, so that the continuous and stable input of the coil into a production line is ensured;
s2, preprocessing: cleaning and chemically pretreating the upper and lower surfaces of the aluminum coil, and then drying;
s3, roll coating: carrying out primer roller coating and finish roller coating on the aluminum coil obtained in the step S2; the primer and the finish are composite fluorocarbon coatings;
s4, baking, solidifying and cooling: and (5) baking the liquid coating coated on the surface of the aluminum coil in the step S3 by using an oven, then finishing curing, and controlling the temperature of the oven after curing to realize cooling of the coating, thereby obtaining the color-coated aluminum coil.
The chemical pretreatment in step S2 is degreasing treatment.
The temperature of the degreasing treatment in the step S2 was 45 ℃, and the time of the degreasing treatment was 10 seconds.
The composite fluorocarbon coating in the step S3 comprises the following components in parts by weight: 30 parts of urethane acrylate, 2 parts of epoxidized polybutadiene resin, 3 parts of titanium dioxide, 4 parts of triglycidyl isocyanurate, twelve 1 parts of alcohol ester and 50400.2 parts of dispersing agent.
The preparation method of the composite fluorocarbon coating in the step S3 is as follows:
the method comprises the following steps: crushing and premixing urethane acrylate, epoxidized polybutadiene resin, titanium dioxide and triglycidyl isocyanurate;
step two: melting and mixing the premixed raw materials by using an extruder, uniformly dispersing, and performing melt extrusion to obtain a mixture;
step three: and (3) adding the alcohol ester dodeca and the dispersing agent 5040 into the mixture obtained in the second step, uniformly dispersing, tabletting, cooling and crushing the extruded material, and finely crushing the crushed material to obtain the water-based oil-based.
The curing temperature in the oven in the step S4 is 241 ℃.
Example 2 production process of color-coated aluminum coil
A production process of a color-coated aluminum coil comprises the following steps:
s1, raw material roll input: the aluminum coil is opened by using the uncoiler to continuously rotate, so that the continuous and stable input of the coil into a production line is ensured;
s2, preprocessing: cleaning and chemically pretreating the upper and lower surfaces of the aluminum coil, and then drying;
s3, roll coating: carrying out primer roller coating and finish roller coating on the aluminum coil obtained in the step S2; the primer and the finish are composite fluorocarbon coatings;
s4, baking, solidifying and cooling: and (5) baking the liquid coating coated on the surface of the aluminum coil in the step S3 by using an oven, then finishing curing, and controlling the temperature of the oven after curing to realize cooling of the coating, thereby obtaining the color-coated aluminum coil.
The chemical pretreatment in step S2 is degreasing treatment.
The temperature of the degreasing treatment in the step S2 is 60 ℃, and the time of the degreasing treatment is 15S.
The composite fluorocarbon coating in the step S3 comprises the following components in parts by weight: 35 parts of urethane acrylate, 4 parts of epoxidized polybutadiene resin, 6 parts of titanium dioxide, 5 parts of triglycidyl isocyanurate, twelve 3 parts of alcohol ester and 50400.4 parts of dispersing agent.
The preparation method of the composite fluorocarbon coating in the step S3 is as follows:
the method comprises the following steps: crushing and premixing urethane acrylate, epoxidized polybutadiene resin, titanium dioxide and triglycidyl isocyanurate;
step two: melting and mixing the premixed raw materials by using an extruder, uniformly dispersing, and performing melt extrusion to obtain a mixture;
step three: and (3) adding the alcohol ester dodeca and the dispersing agent 5040 into the mixture obtained in the second step, uniformly dispersing, tabletting, cooling and crushing the extruded material, and finely crushing the crushed material to obtain the water-based oil-based.
The curing temperature in the oven in the step S4 was 252 ℃.
Example 3 production process of color-coated aluminum coil
A production process of a color-coated aluminum coil comprises the following steps:
s1, raw material roll input: the aluminum coil is opened by using the uncoiler to continuously rotate, so that the continuous and stable input of the coil into a production line is ensured;
s2, preprocessing: cleaning and chemically pretreating the upper and lower surfaces of the aluminum coil, and then drying;
s3, roll coating: carrying out primer roller coating and finish roller coating on the aluminum coil obtained in the step S2; the primer and the finish are composite fluorocarbon coatings;
s4, baking, solidifying and cooling: and (5) baking the liquid coating coated on the surface of the aluminum coil in the step S3 by using an oven, then finishing curing, and controlling the temperature of the oven after curing to realize cooling of the coating, thereby obtaining the color-coated aluminum coil.
The chemical pretreatment in step S2 is degreasing treatment.
The temperature of the degreasing treatment in the step S2 was 70 ℃, and the time of the degreasing treatment was 20 seconds.
The composite fluorocarbon coating in the step S3 comprises the following components in parts by weight: 40 parts of urethane acrylate, 6 parts of epoxidized polybutadiene resin, 9 parts of titanium dioxide, 8 parts of triglycidyl isocyanurate, twelve 4 parts of alcohol ester and 50400.6 parts of dispersing agent.
The preparation method of the composite fluorocarbon coating in the step S3 is as follows:
the method comprises the following steps: crushing and premixing urethane acrylate, epoxidized polybutadiene resin, titanium dioxide and triglycidyl isocyanurate;
step two: melting and mixing the premixed raw materials by using an extruder, uniformly dispersing, and performing melt extrusion to obtain a mixture;
step three: and (3) adding the alcohol ester dodeca and the dispersing agent 5040 into the mixture obtained in the second step, uniformly dispersing, tabletting, cooling and crushing the extruded material, and finely crushing the crushed material to obtain the water-based oil-based.
The curing temperature in the oven in the step S4 was 260 ℃.
Comparative example 1 production process of color-coated aluminum coil
A production process of a color-coated aluminum coil comprises the following steps:
s1, raw material roll input: the aluminum coil is opened by using the uncoiler to continuously rotate, so that the continuous and stable input of the coil into a production line is ensured;
s2, preprocessing: cleaning the upper surface and the lower surface of the aluminum coil, and then drying;
s3, roll coating: carrying out primer roller coating and finish roller coating on the aluminum coil obtained in the step S2; the primer and the finish are composite fluorocarbon coatings;
s4, baking, solidifying and cooling: and (5) baking the liquid coating coated on the surface of the aluminum coil in the step S3 by using an oven, then finishing curing, and controlling the temperature of the oven after curing to realize cooling of the coating, thereby obtaining the color-coated aluminum coil.
The composite fluorocarbon coating in the step S3 comprises the following components in parts by weight: 35 parts of urethane acrylate, 4 parts of epoxidized polybutadiene resin, 6 parts of titanium dioxide, 5 parts of triglycidyl isocyanurate, twelve 3 parts of alcohol ester and 50400.4 parts of dispersing agent.
The preparation method of the composite fluorocarbon coating in the step S3 is as follows:
the method comprises the following steps: crushing and premixing urethane acrylate, epoxidized polybutadiene resin, titanium dioxide and triglycidyl isocyanurate;
step two: melting and mixing the premixed raw materials by using an extruder, uniformly dispersing, and performing melt extrusion to obtain a mixture;
step three: and (3) adding the alcohol ester dodeca and the dispersing agent 5040 into the mixture obtained in the second step, uniformly dispersing, tabletting, cooling and crushing the extruded material, and finely crushing the crushed material to obtain the water-based oil-based.
The curing temperature in the oven in the step S4 was 252 ℃.
The difference from example 2 is that no chemical pretreatment was performed in step S2.
Comparative example 2 production process of color-coated aluminum coil
A production process of a color-coated aluminum coil comprises the following steps:
s1, raw material roll input: the aluminum coil is opened by using the uncoiler to continuously rotate, so that the continuous and stable input of the coil into a production line is ensured;
s2, preprocessing: cleaning and chemically pretreating the upper and lower surfaces of the aluminum coil, and then drying;
s3, roll coating: carrying out primer roller coating and finish roller coating on the aluminum coil obtained in the step S2; the primer and the finish are composite fluorocarbon coatings;
s4, baking, solidifying and cooling: and (5) baking the liquid coating coated on the surface of the aluminum coil in the step S3 by using an oven, then finishing curing, and controlling the temperature of the oven after curing to realize cooling of the coating, thereby obtaining the color-coated aluminum coil.
The chemical pretreatment in step S2 is degreasing treatment.
The temperature of the degreasing treatment in the step S2 is 60 ℃, and the time of the degreasing treatment is 15S.
The composite fluorocarbon coating in the step S3 comprises the following components in parts by weight: 35 parts of urethane acrylate, 4 parts of epoxidized polybutadiene resin, 5 parts of triglycidyl isocyanurate, twelve 3 parts of alcohol ester and 50400.4 parts of dispersing agent.
The preparation method of the composite fluorocarbon coating in the step S3 is as follows:
the method comprises the following steps: crushing and premixing urethane acrylate, epoxidized polybutadiene resin and triglycidyl isocyanurate;
step two: melting and mixing the premixed raw materials by using an extruder, uniformly dispersing, and performing melt extrusion to obtain a mixture;
step three: and (3) adding the alcohol ester dodeca and the dispersing agent 5040 into the mixture obtained in the second step, uniformly dispersing, tabletting, cooling and crushing the extruded material, and finely crushing the crushed material to obtain the water-based oil-based.
The curing temperature in the oven in the step S4 was 252 ℃.
The difference from the embodiment 2 is that titanium dioxide is not added in the composite fluorocarbon coating.
Comparative example 3 production process of color-coated aluminum coil
A production process of a color-coated aluminum coil comprises the following steps:
s1, raw material roll input: the aluminum coil is opened by using the uncoiler to continuously rotate, so that the continuous and stable input of the coil into a production line is ensured;
s2, preprocessing: cleaning and chemically pretreating the upper and lower surfaces of the aluminum coil, and then drying;
s3, roll coating: carrying out primer roller coating and finish roller coating on the aluminum coil obtained in the step S2; the primer and the finish are composite fluorocarbon coatings;
s4, baking, solidifying and cooling: and (5) baking the liquid coating coated on the surface of the aluminum coil in the step S3 by using an oven, then finishing curing, and controlling the temperature of the oven after curing to realize cooling of the coating, thereby obtaining the color-coated aluminum coil.
The chemical pretreatment in step S2 is degreasing treatment.
The temperature of the degreasing treatment in the step S2 is 60 ℃, and the time of the degreasing treatment is 15S.
The composite fluorocarbon coating in the step S3 comprises the following components in parts by weight: 35 parts of urethane acrylate, 4 parts of epoxidized polybutadiene resin, 6 parts of titanium dioxide, twelve 3 parts of alcohol ester and 50400.4 parts of dispersing agent.
The preparation method of the composite fluorocarbon coating in the step S3 is as follows:
the method comprises the following steps: crushing and premixing urethane acrylate, epoxidized polybutadiene resin and titanium dioxide;
step two: melting and mixing the premixed raw materials by using an extruder, uniformly dispersing, and performing melt extrusion to obtain a mixture;
step three: and (3) adding the alcohol ester dodeca and the dispersing agent 5040 into the mixture obtained in the second step, uniformly dispersing, tabletting, cooling and crushing the extruded material, and finely crushing the crushed material to obtain the water-based oil-based.
The curing temperature in the oven in the step S4 was 252 ℃.
The difference from the example 2 is that the composite fluorocarbon coating contains triglycidyl isocyanurate.
Test example I, coating Performance test
1. Test materials: examples 1-3, comparative examples 1-3.
2. Test results
The test results are shown in table 1.
TABLE 1 coating Performance test
As can be seen from Table 1, the color-coated aluminum coils prepared by the production processes of examples 1-3 have thickness uniformity and color uniformity significantly better than those of comparative examples 1-3, and also have excellent weather resistance, impact resistance, alkali resistance and oil resistance, so that a coating with very good surface appearance leveling can be obtained, and the decorative effect of the color-coated aluminum coils is greatly improved. In comparative examples 1-3, the color-coated aluminum coil produced by changing the production process steps of the color-coated aluminum coil and the proportioning components of the composite fluorocarbon coating had the phenomena of cracking, paint removal, bottom exposure, bubbling and powdering.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (7)
1. The production process of the color-coated aluminum coil is characterized by comprising the following steps of:
s1, raw material roll input: the aluminum coil is opened by using the uncoiler to continuously rotate, so that the continuous and stable input of the coil into a production line is ensured;
s2, preprocessing: cleaning and chemically pretreating the upper and lower surfaces of the aluminum coil, and then drying;
s3, roll coating: carrying out primer roller coating and finish roller coating on the aluminum coil obtained in the step S2; the primer and the finish are composite fluorocarbon coatings;
s4, baking, solidifying and cooling: and (5) baking the liquid coating coated on the surface of the aluminum coil in the step S3 by using an oven, then finishing curing, and controlling the temperature of the oven after curing to realize cooling of the coating, thereby obtaining the color-coated aluminum coil.
2. The process for producing a color-coated aluminum coil as claimed in claim 1, wherein the chemical pretreatment in step S2 is degreasing.
3. The production process of the color-coated aluminum coil as claimed in claim 2, wherein the degreasing treatment in the step S2 is performed at a temperature of 45-70 ℃ for 10-20S.
4. The production process of the color-coated aluminum coil as claimed in claim 1, wherein the composite fluorocarbon coating in the step S3 comprises the following components in parts by weight: 30-40 parts of urethane acrylate, 2-6 parts of epoxidized polybutadiene resin, 3-9 parts of titanium dioxide, 4-8 parts of triglycidyl isocyanurate, 1-4 parts of alcohol ester and 50400.2-0.6 part of dispersing agent.
5. The production process of the color-coated aluminum coil as claimed in claim 4, wherein the composite fluorocarbon coating in the step S3 comprises the following components in parts by weight: 35 parts of urethane acrylate, 4 parts of epoxidized polybutadiene resin, 6 parts of titanium dioxide, 5 parts of triglycidyl isocyanurate, twelve 3 parts of alcohol ester and 50400.4 parts of dispersing agent.
6. The production process of the color-coated aluminum coil as claimed in claim 3 or 4, wherein the preparation method of the composite fluorocarbon coating in the step S3 is as follows:
the method comprises the following steps: crushing and premixing urethane acrylate, epoxidized polybutadiene resin, titanium dioxide and triglycidyl isocyanurate;
step two: melting and mixing the premixed raw materials by using an extruder, uniformly dispersing, and performing melt extrusion to obtain a mixture;
step three: and (3) adding the alcohol ester dodeca and the dispersing agent 5040 into the mixture obtained in the second step, uniformly dispersing, tabletting, cooling and crushing the extruded material, and finely crushing the crushed material to obtain the water-based oil-based.
7. The process for producing a color-coated aluminum coil as claimed in claim 1, wherein the oven curing temperature in step S4 is 241 ℃ -260 ℃.
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