CN114833053A - Color-coated sheet and preparation method thereof - Google Patents
Color-coated sheet and preparation method thereof Download PDFInfo
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- CN114833053A CN114833053A CN202210636932.XA CN202210636932A CN114833053A CN 114833053 A CN114833053 A CN 114833053A CN 202210636932 A CN202210636932 A CN 202210636932A CN 114833053 A CN114833053 A CN 114833053A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 238000000576 coating method Methods 0.000 claims abstract description 210
- 239000011248 coating agent Substances 0.000 claims abstract description 197
- 239000000758 substrate Substances 0.000 claims abstract description 40
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 claims abstract description 36
- 238000002161 passivation Methods 0.000 claims abstract description 22
- 239000002904 solvent Substances 0.000 claims abstract description 15
- 239000005002 finish coating Substances 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims description 74
- 229910000831 Steel Inorganic materials 0.000 claims description 49
- 239000010959 steel Substances 0.000 claims description 49
- 238000000034 method Methods 0.000 claims description 31
- 239000000126 substance Substances 0.000 claims description 29
- 238000004519 manufacturing process Methods 0.000 claims description 13
- 238000003825 pressing Methods 0.000 claims description 7
- 239000010936 titanium Substances 0.000 claims description 6
- 229910052719 titanium Inorganic materials 0.000 claims description 6
- -1 titanium ions Chemical class 0.000 claims description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 3
- 230000037452 priming Effects 0.000 claims description 3
- 239000002987 primer (paints) Substances 0.000 abstract description 59
- 239000003973 paint Substances 0.000 abstract description 19
- 239000000853 adhesive Substances 0.000 abstract description 4
- 230000001070 adhesive effect Effects 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 125000000524 functional group Chemical group 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 17
- 238000009500 colour coating Methods 0.000 description 12
- 238000005452 bending Methods 0.000 description 6
- 238000007761 roller coating Methods 0.000 description 5
- 239000011229 interlayer Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 230000032683 aging Effects 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 239000011651 chromium Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000002203 pretreatment Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000006115 industrial coating Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 244000144972 livestock Species 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000011253 protective coating Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
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- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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
-
- 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
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/36—Successively applying liquids or other fluent materials, e.g. without intermediate treatment
- B05D1/38—Successively applying liquids or other fluent materials, e.g. without intermediate treatment with intermediate treatment
-
- 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
-
- 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
- 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
-
- 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
- B05D7/24—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 for applying particular liquids or other fluent materials
-
- 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
- B05D7/546—No clear coat specified each layer being cured, at least partially, separately
-
- 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
- B05D2202/00—Metallic substrate
- B05D2202/10—Metallic substrate based on Fe
-
- 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
- B05D2350/00—Pretreatment of the substrate
- B05D2350/60—Adding a layer before coating
-
- 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
- B05D2506/00—Halogenated polymers
- B05D2506/10—Fluorinated polymers
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- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention discloses a color-coated plate and a preparation method thereof, a color-coated substrate is pretreated by a chromium-free solvent to form a passivation layer on the surface, a chromium-free primer is coated to the passivation layer for the first time, a primer surface is formed by baking at a first temperature, the primer surface is beneficial to improving the leveling property and the adhesive force of fluorocarbon paint, the fluorocarbon paint is coated to the primer surface finely, a surface paint surface is formed by baking at a second temperature to prepare the color-coated plate, the first temperature and the second temperature represent the temperature of the color-coated substrate during baking, because the first temperature is at least 13 ℃ lower than the second temperature, the curing degree of the primer surface formed by baking is reduced, more functional groups are combined with the finish-coated fluorocarbon coating on the primer surface, the adhesive force of the fluorocarbon coating during finish coating is improved, the surface coating surface is formed by baking at higher temperature, the fluorocarbon coating can be fully cured, and shrinkage cavity is avoided, so that the coating quality of the chromium-free system color coated sheet is improved.
Description
Technical Field
The application relates to the technical field of color-coated sheet preparation, in particular to a color-coated sheet and a preparation method thereof.
Background
The color coated steel plate is mainly made up by using metal strip steel as base material (cold-rolled plate, hot-galvanized plate, aluminium-plated plate, high aluminium alloy plate and stainless steel plate, etc.) and coating or laminating various organic coatings or plastic films on its surface. The color coated sheet has the advantages of corrosion resistance, high mechanical strength, beautiful appearance, easy processing and forming and the like, and has obvious technical advantages and cost advantages compared with the traditional after-coating product. Therefore, the color-coated sheet is widely applied to the industries of buildings, household appliances, automobiles, transportation, livestock raising and the like.
The national industry policy enforcement standard GB30981-2020 stipulates that from 1/2022, the harmful substances in the industrial protective coating must implement a limited standard, which is controlled from the source of industrial coating manufacturers. Among them, hexavalent chromium (Cr) 6+ ) The limiting value is less than or equal to 1000. The color coating machine set adopts hexavalent chromium pretreating agent in the pretreatment and chemical coating section, and the primer coating also contains hexavalent chromium. In order to adapt to the national mandatory standard, most color coating units are switched by a chromium-free system in 2022. When the chromium-free primer paint serving as the pretreating agent is replaced to prepare the color-coated plate at present, poor interlayer adhesion is easy to occur, and the performance of a finished product of the color-coated plate is directly influenced.
Therefore, how to improve the coating quality of the chromium-free system color coated sheet is a technical problem to be solved at present.
Disclosure of Invention
The color-coated sheet and the preparation method thereof improve the coating quality of the chromium-free system color-coated sheet.
The embodiment of the invention provides the following scheme:
in a first aspect, an embodiment of the present invention provides a method for preparing a color-coated sheet, including:
pretreating the color-coated substrate by adopting a chromium-free solvent to form a passivation layer on the surface of the color-coated substrate;
primarily coating the chromium-free primer on the passivation layer, and baking at a first temperature to form a primer surface;
and finely coating the fluorocarbon coating on the primer surface, baking at a second temperature to form a surface coating surface, and preparing a color-coated plate, wherein the first temperature and the second temperature are represented as the temperature of the color-coated substrate during baking, and the first temperature is at least 13 ℃ lower than the second temperature.
In an alternative embodiment, the first temperature is at least 15 ℃ lower than the second temperature.
In an alternative embodiment, the step of pretreating the color-coated substrate with a chromium-free solvent is configured to have an electrical conductivity of 12 ± 2 ms/cm.
In an optional embodiment, the color-coated substrate is strip steel, and the strip steel is pretreated by a chemical coating machine; the pretreatment step comprises the following steps:
controlling the traction speed of the strip steel to be 70-80 m/min;
the chemical coating machine is configured with a chemical coating temperature of 190-210 ℃ and a strip steel temperature of 70-80 ℃, the upper surface and the lower surface of the strip steel are pretreated by the chromium-free solvent containing titanium ions, and the titanium content in the pretreated passivation layer is 3-6mg/m 2 。
In an alternative embodiment, in the step of pretreating the upper and lower surfaces of the strip,
the roller speed of a coating roller of the chemical coating machine is 98-112m/min, the roller speed of a material taking roller is 49-56m/min, and the pressure of the coating roller and the material taking roller is 1000-2500N.
In an alternative embodiment, the color-coated substrate is a strip steel, and the passivation layer comprises an upper surface and a lower surface of the strip steel; priming the passivation layer with a chromium-free primer comprising:
primarily coating the chromium-free primer to the upper surface and the lower surface through a coating roller and a nip roller; wherein, when the upper surface is primarily coated, the rotating speed of the coating roller is 130m/min for 120-; when the lower surface is primarily coated, the viscosity of the chrome-free primer at 25 ℃ of Zehn cup #4 is 8-12s, the rotating speed of the coating roller is 110-75 m/min, the traction speed of the strip steel is 65-75m/min, and the pressure of the pressure roller is 1600-2000N.
In an optional embodiment, the color-coated substrate is a strip steel, and the primer surface comprises an upper surface and a lower surface of the strip steel; finish coating a fluorocarbon coating to the primer surface, comprising:
finely coating the fluorocarbon coating to the upper surface and the lower surface through a coating roller and a material pressing roller; when the upper surface is finely coated, the viscosity of the fluorocarbon coating at 25 ℃ Chuanyn cup #4 is 20-28s, the rotating speed of the coating roller is 100-120m/min, the traction speed of the strip steel is 60-80m/min, the pressure of the coating roller is 1000-3000N, and the pressure of the material pressing roller is 16000-20000N; when the lower surface is finely coated, the viscosity of the fluorocarbon coating at 25 ℃ of Zehn cup #4 is 20-28s, the rotating speed of the coating roller is 120-130m/min, the traction speed of the strip steel is 50-70m/min, and the pressure of the nip roll is 16000-20000N.
In an optional embodiment, the color-coated substrate is a strip steel, the first temperature is 232-.
In an optional embodiment, the strip steel is continuously baked by a baking oven at the traction speed of 70-80m/min to prepare the color-coated plate;
when the first temperature is 232-241 ℃, the temperature of the first baking area of the baking furnace is 245-250 ℃, and the temperature of the second baking area to the fifth baking area is 280-285 ℃;
when the second temperature is 232-.
In a second aspect, the embodiment of the present invention further provides a color-coated sheet, which is prepared by the method described in any one of the first aspects, and the surface paint is at least one layer.
In an optional embodiment, the thickness of the primer surface and the thickness of the topcoat surface of the upper surface of the color-coated sheet are both 20-25 μm, the thickness of the primer surface of the lower surface of the color-coated sheet is 7-10 μm, and the thickness of the topcoat surface is 18-20 μm.
Compared with the prior art, the color-coated sheet and the preparation method thereof have the following advantages:
the method comprises the steps of pretreating a color-coated substrate by using a chromium-free solvent to form a passivation layer on the surface of the color-coated substrate, primarily coating a chromium-free primer on the passivation layer, baking at a first temperature to form a primer surface, wherein the primer surface is favorable for improving the leveling property and the adhesive force of the fluorocarbon coating, finely coating the fluorocarbon coating on the primer surface, baking at a second temperature to form a surface coating, and then preparing the color-coated substrate.
Drawings
In order to more clearly illustrate the embodiments of the present specification or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present specification, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart of a method for manufacturing a color-coated sheet according to an embodiment of the present invention;
FIG. 2 is a schematic view showing the appearance of a color-coated sheet prepared by the method of the present invention;
FIG. 3 is a schematic view showing the appearance of a color-coated sheet prepared before the method of the present invention is carried out.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying 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, rather than all embodiments, and all other embodiments obtained by those skilled in the art based on the embodiments of the present invention belong to the scope of protection of the embodiments of the present invention.
Relevant researches show that pretreatment has a great influence on the corrosion resistance of a chromium-free color-coated plate product, chromium-free solvent pretreatment and integral replacement of a chromium-free primer can have a certain influence on the leveling property of a paint surface, and the problems of plate surface bubbles and the like occur, and are particularly prominent in the color-coated plate product with a thicker coating. The production process of the chromium-free fluorocarbon color coated sheet is not favorable, the standard thickness of a common color coated product is 5 mu m of the primer surface and 15 mu m of the surface paint surface, and the requirement on the quality of the whole film thickness is more than or equal to 20 mu m. With the development of high-end materials, green low-carbon products and process technologies, the market demand of long-life building color plates with thick coatings/thick plating layers is increasing day by day. The existing super-thick coating color-coated plate is mainly of a chromium system, and is produced by adopting a roller coating mode for three times or more aiming at the condition that the film thickness of the front surface is more than or equal to 30 micrometers, so that the existing super-thick coating color-coated plate cannot be suitable for producing a double-sided chromium-free fluorocarbon thick coating color-coated plate by a two-coating and two-drying process.
Referring to fig. 1, fig. 1 is a flowchart of a method for manufacturing a color-coated sheet according to an embodiment of the present invention, including:
and S11, pretreating the color-coated substrate by adopting a chromium-free solvent to form a passivation layer on the surface of the color-coated substrate.
Specifically, the chromium-free solvent is a pretreatment agent (or called chromium-free pretreatment solvent) for chromium-free ions, and can be used for pretreating the color-coated substrate after being configured according to the use mode of the chromium-free solvent after being purchased from the market, for example, the configured water distribution ratio is 10%, and the conductivity of the configured chromium-free solvent is 12 +/-2 ms/cm; the color-coated substrate can be a cold-rolled sheet or other sheet materials after surface treatment, and the pretreatment of the color-coated substrate can be implemented by adopting the modes of container soaking, roll coating or spraying and the like, so that a passivation layer (or called passivation film) convenient for attaching the chromium-free primer can be formed on the surface of the color-coated substrate.
At present, a color-coated substrate is prepared by strip steel and is implemented by a full-automatic production line, the production speed is below 60m/min, and certain influence is caused on the productivity.
In a specific embodiment, the color-coated substrate is strip steel, and the strip steel is pretreated by a chemical coating machine; the pretreatment step comprises the following steps:
controlling the traction speed of the strip steel to be 70-80 m/min; the coating temperature of a coating machine is 190-210 ℃, the temperature of the strip steel is 70-80 ℃, the upper surface and the lower surface of the strip steel are pretreated by the chromium-free solvent containing titanium ions, and the titanium content in the pretreated passivation layer is 3-6mg/m 2 。
Specifically, the chemical coating machine is an automatic device for implementing a chemical coating process, and the traction speed, the chemical coating temperature and the strip steel temperature can be freely set through a human-computer interaction interface of the device.
In a specific embodiment, in the step of pretreating the upper and lower surfaces of the strip,
the roller speed of the coating roller of the chemical coating machine is 98-112m/min, the roller speed of the material belt roller is 49-56m/min, and the pressure (or A/P pressure) of the coating roller and the material belt roller is 1000-2500N. After the pre-treatment of the color-coated substrate is completed, the process proceeds to step S12.
And S12, primarily coating the chromium-free primer on the passivation layer, and baking at a first temperature to form a primer surface.
Specifically, the primary coating of the chromium-free primer to the passivation layer may be performed manually by a coating roller, or may be performed by an automated apparatus such as a roll coater, the primary coating is baked at a preset first temperature, and the chromium-free primer is gradually cured to form a primer surface, where it is noted that, since the primer surface needs to reach a non-complete curing state, the first temperature may be set with reference to a curing temperature corresponding to a complete curing state formed by baking, for example, 13 to 20 ℃. Baking to form a primer surface, and then proceeding to step S13.
S13, finely coating fluorocarbon paint on the primer surface, baking at a second temperature to form a surface paint surface, and preparing the color-coated plate, wherein the first temperature and the second temperature are represented as the temperature of the color-coated substrate during baking, and the first temperature is at least 13 ℃ lower than the second temperature.
Specifically, finish coating is carried out after the primer surface is formed, the surface paint surface formed by baking at the second temperature has better surface quality, the second temperature is the temperature of the color-coated substrate corresponding to the complete curing of the surface paint surface in baking, the baking can be implemented through a baking oven, and the baking oven is baking equipment capable of freely setting the temperature and the baking time.
In one specific embodiment, the color-coated substrate is a strip steel, and the passivation layer comprises the upper surface and the lower surface of the strip steel; priming a chromium-free primer to a passivation layer, comprising:
primarily coating a chromium-free primer on the upper surface (or front surface) and the lower surface (or back surface) through a coating roller and a nip roller; wherein, when the upper surface is initially coated, the rotating speed of the coating roller is 130m/min at 120-; when the lower surface is primarily coated, the viscosity of the chrome-free primer at 25 ℃ of Zehn cup #4 is 8-12s, the rotating speed of a coating roller is 110-75 m/min, the traction speed of the strip steel is 65-75m/min, and the pressure of a pressure roller is 1600-2000N.
In one specific embodiment, the color-coated substrate is a strip steel, and the primer surface comprises the upper surface and the lower surface of the strip steel; finish coating a fluorocarbon coating to the primer surface, comprising:
finely coating fluorocarbon paint on the upper surface and the lower surface by a coating roller and a material pressing roller; wherein, when the upper surface is coated finely, the viscosity of the fluorocarbon coating at 25 ℃ Zealand cup #4 is 20-28s, the rotating speed of a coating roller is 100-120m/min, the traction speed of the strip steel is 60-80m/min, the pressure of the coating roller is 1000-3000N, and the pressure of a material pressing roller is 16000-20000N; when the lower surface is finely coated, the viscosity of the fluorocarbon coating at 25 ℃ in a Zehn cup #4 is 20-28s, the rotating speed of a coating roller is 120-130m/min, the traction speed of the strip steel is 50-70m/min, and the pressure of a material pressing roller is 16000-20000N.
The parameters for initial coating by a roll coater are shown in Table 1:
specifically, through the setting of above-mentioned parameter, can guarantee under the condition that color-coated sheet coating thickness is up to standard, guarantee production efficiency maximize.
In a specific embodiment, the color-coated substrate is a strip steel, the first temperature is 232-.
Specifically, when the color coating is basically baked at the first temperature and the second temperature, the calibration test can be carried out by using the temperature measuring paper of the field sample belt, and the temperature measuring paper correspondingly generates different color changes at different temperatures so as to accurately control the baking in the corresponding temperature interval.
In a specific embodiment, the strip steel is continuously roasted by a roasting furnace at the traction speed of 70-80m/min to prepare a color-coated plate;
when the first temperature is 232-241 ℃, the temperature of the first baking area of the baking furnace is 245-250 ℃, and the temperature of the second baking area to the fifth baking area is 280-285 ℃; when the second temperature is 232-.
In particular, the color-coated sheet can be continuously baked through a baking oven in order to be suitable for continuous preparation of the color-coated sheet through strip steel. For example, a primary coating baking oven and a finish coating baking oven are arranged on a color coating plate production line, five areas are correspondingly arranged, the oven temperature is kept in a corresponding temperature interval, so that the temperature of the color coating substrate is controlled to be a first temperature and a second temperature, and similarly, the set oven temperature can be calibrated and adjusted through temperature measurement paper.
Based on the same inventive concept as the preparation method, the embodiment of the invention also provides a color-coated sheet, which is prepared by the method of any one of the preparation methods, and the surface paint surface is at least one layer.
In a specific embodiment, the thickness of the primer surface and the thickness of the topcoat surface of the upper surface of the color-coated sheet are both 20-25 μm, the thickness of the primer surface of the lower surface of the color-coated sheet is 7-10 μm, and the thickness of the topcoat surface is 18-20 μm. Namely, the invention can realize the super-thick coating with the film thickness of the upper surface of 50 mu m at most by using a two-coating process, and can reach the film thickness level of 75-100 mu m higher by using roller coating for three times or four times. Preferably, the thickness of the primer surface and the thickness of the topcoat surface of the upper surface of the color-coated plate are both 20 micrometers, the thickness of the primer surface of the upper surface of the color-coated plate is set to be 20 micrometers, the quality of the primer surface can be improved, the better leveling property and adhesion force can be guaranteed when the topcoat surface of the upper surface is coated, the thickness of the primer surface of the lower surface of the color-coated plate is 7 micrometers, and the thickness of the topcoat surface is 18 micrometers.
In the following, the embodiment of the present invention will take the current color coating production line of the full-flow chromium-free (both pre-treatment and primer chromium-free) system as an example, and further illustrate the specific control parameters and the corresponding test results, so that the top surface (or front surface) and the bottom surface (or back surface) of the prepared color coated plate are both fluorocarbon coatings. The color coating substrate can be any one of a zinc-plated substrate, an aluminum-zinc-plated substrate or a zinc-aluminum-magnesium substrate, and under the design of different film thicknesses aiming at the color coating plate product with the super-thick fluorocarbon coating, when the traction speed of the strip steel is ensured to be 70-80m/min, the chemical coating process, the roller coating process and the baking process are designed so as to meet the requirements of the surface quality and the performance of the finished product of the super-thick fluorocarbon chromium-free color coating product.
Example 1: the film thicknesses of the primer surface and the topcoat surface of the product are respectively designed to be 20 microns and 20 microns, and the film thicknesses of the primer surface and the topcoat surface of the product are respectively designed to be 7 microns and 18 microns. Setting the process speed of the unit to be 70m/min, namely the traction speed of the strip steel; the conductivity of the chemical coating process is 12ms/cm, the chemical coating temperature is 200 ℃, the roller speed of an upper surface coating roller is 100m/min, the roller speed of a material carrying roller is 50m/min, the A/P pressure is 180kg, the roller speed of a lower surface coating roller is 105m/min, the roller speed of the material carrying roller is 52m/min, and the A/P pressure is 190 kg; coating the primary coating front surface with raw paint, wherein the roller speed of a coating roller is 125m/min, the roller speed of a material carrying roller is 75m/min, the roller pressure of the coating roller is 180kg, and the roller pressure of the material carrying roller is 1800 kg; the viscosity value of the primary coating back surface is 10 seconds (25 ℃, Zahn #4 cups), the roller speed of a coating roller is 115m/min, the roller speed of a material carrying roller is 70m/min, and the roller speed of the material carrying roller is 1800 kg; the viscosity value of the fine coating front surface is 25 seconds (25 ℃, Zahn #4 cups), the roller speed of a coating roller is 105m/min, the roller speed of a material carrying roller is 65m/min, the roller pressure of the coating roller is 150kg, and the roller pressure of the material carrying roller is 1700 kg; the viscosity value of the finish-coated back surface is 25 seconds (25 ℃, Zahn #4 cups), the roller speed of a coating roller is 125m/min, the roller speed of a material carrying roller is 60m/min, and the roller speed of the material carrying roller is 1700 kg; the primary coating plate temperature PMT (i.e. the first temperature) was 235 ℃ and the fine coating plate temperature PMT (i.e. the second temperature) was 250 ℃.
Example 2: the film thicknesses of the primer surface and the topcoat surface of the product are respectively designed to be 20 microns and 20 microns, and the film thicknesses of the primer surface and the topcoat surface of the product are respectively designed to be 7 microns and 18 microns. The process speed of the unit is 75 m/min; the conductivity of the chemical coating process is 11ms/cm, the chemical coating temperature is 195 ℃, the roller speed of an upper surface coating roller is 105m/min, the roller speed of a material carrying roller is 52m/min, the A/P pressure is 190kg, the roller speed of a lower surface coating roller is 100m/min, the roller speed of the material carrying roller is 50m/min, and the A/P pressure is 180 kg; coating the primary coating front surface with raw paint, wherein the roller speed of a coating roller is 127m/min, the roller speed of a material carrying roller is 76m/min, the roller speed of the coating roller is 200kg, and the roller speed of the material carrying roller is 1750 kg; the viscosity value of the primary coating back surface is 9 seconds (25 ℃, Zahn #4 cups), the roller speed of the coating roller is 112m/min, the roller speed of the material carrying roller is 68m/min, and the roller speed of the material carrying roller is 1900 kg; the viscosity value of the fine coating front surface is 23 seconds (25 ℃, Zahn #4 cups), the roller speed of a coating roller is 110m/min, the roller speed of a material carrying roller is 68m/min, the roller pressure of the coating roller is 180kg, and the roller pressure of the material carrying roller is 1800 kg; the viscosity value of the fine coating back surface is 22 seconds (25 ℃, Zahn #4 cups), the roller speed of a coating roller is 122m/min, the roller speed of a material carrying roller is 65m/min, and the roller pressure of the material carrying roller is 1800 kg; the primary coating plate temperature PMT was 236 ℃ and the fine coating plate temperature PMT was 252 ℃.
Example 3: the film thicknesses of the primer surface and the topcoat surface of the product are respectively designed to be 20 microns and 20 microns, and the film thicknesses of the primer surface and the topcoat surface of the product are respectively designed to be 7 microns and 18 microns. The process speed of the unit is 72 m/min; the conductivity of the chemical coating process is 12ms/cm, the chemical coating temperature is 200 ℃, the roller speed of an upper surface coating roller is 107m/min, the roller speed of a material carrying roller is 54m/min, the A/P pressure is 210kg, the roller speed of a lower surface coating roller is 105m/min, the roller speed of the material carrying roller is 52m/min, and the A/P pressure is 190 kg; coating the primary coating front surface with the raw paint, wherein the roller speed of a coating roller is 124m/min, the roller speed of a material carrying roller is 73m/min, the roller pressure of the coating roller is 180kg, and the roller pressure of the material carrying roller is 1900 kg; the viscosity of the primary coating back surface is 10 seconds (25 ℃, Zahn #4 cups), the roller speed of the coating roller is 115m/min, the roller speed of the belt material roller is 70m/min, and the roller pressure of the belt material roller is 1850 kg; the viscosity value of the fine coating front surface is 24 seconds (25 ℃, Zahn #4 cups), the roller speed of a coating roller is 115m/min, the roller speed of a material carrying roller is 65m/min, the roller pressure of the coating roller is 170kg, and the roller pressure of the material carrying roller is 1750 kg; the viscosity value of the fine coating back surface is 24 seconds (25 ℃, Zahn #4 cups), the roller speed of a coating roller is 126m/min, the roller speed of a material carrying roller is 68m/min, and the roller speed of the material carrying roller is 1900 kg; the primary coating temperature PMT was 234 ℃ and the fine coating temperature PMT was 250 ℃.
Example 4: the film thicknesses of the primer surface and the topcoat surface of the product are respectively designed to be 20 microns and 20 microns, and the film thicknesses of the primer surface and the topcoat surface of the product are respectively designed to be 7 microns and 18 microns. The process speed of the unit is 78 m/min; the conductivity of the chemical coating process is 13ms/cm, the chemical coating temperature is 205 ℃, the roller speed of an upper surface coating roller is 110m/min, the roller speed of a material carrying roller is 55m/min, the A/P pressure is 220kg, the roller speed of a lower surface coating roller is 108m/min, the roller speed of the material carrying roller is 54m/min, and the A/P pressure is 200 kg; coating the primary coating front surface with the raw paint, wherein the roller speed of a coating roller is 123m/min, the roller speed of a material-carrying roller is 74m/min, the roller speed of the coating roller is 160kg, and the roller speed of the material-carrying roller is 1700 kg; the viscosity value of the primary coating back surface is 11 seconds (25 ℃, Zahn #4 cups), the roller speed of the coating roller is 118m/min, the roller speed of the material carrying roller is 72m/min, and the roller speed of the material carrying roller is 1900 kg; the viscosity value of the fine coating front surface is 22 seconds (25 ℃, Zahn #4 cups), the roller speed of a coating roller is 105m/min, the roller speed of a material carrying roller is 70m/min, the roller pressure of the coating roller is 200kg, and the roller pressure of the material carrying roller is 1850 kg; the viscosity value of the fine coating back surface is 23 seconds (25 ℃, Zahn #4 cups), the roller speed of a coating roller is 128m/min, the roller speed of a material carrying roller is 65m/min, and the roller pressure of the material carrying roller is 1950 kg; the primary coating temperature PMT was 232 ℃ and the fine coating temperature PMT was 252 ℃.
Example 5: the film thicknesses of the primer surface and the topcoat surface of the product are respectively designed to be 20 microns and 20 microns, and the film thicknesses of the primer surface and the topcoat surface of the product are respectively designed to be 7 microns and 18 microns. The process speed of the unit is 80 m/min; the conductivity of the chemical coating process is 14ms/cm, the chemical coating temperature is 208 ℃, the roller speed of an upper surface coating roller is 110m/min, the roller speed of a material carrying roller is 53m/min, the A/P pressure is 230kg, the roller speed of a lower surface coating roller is 110m/min, the roller speed of the material carrying roller is 52m/min, and the A/P pressure is 220 kg; coating the primary coating with the primary paint on the front surface, wherein the roller speed of a coating roller is 125m/min, the roller speed of a material carrying roller is 75m/min, the roller pressure of the coating roller is 190kg, and the roller pressure of the material carrying roller is 1950 kg; the viscosity value of the primary coating back surface is 10 seconds (25 ℃, Zahn #4 cups), the roller speed of the coating roller is 120m/min, the roller speed of the material carrying roller is 70m/min, and the roller pressure of the material carrying roller is 1850 kg; the viscosity value of the fine coating front surface is 23 seconds (25 ℃, Zahn #4 cups), the roller speed of a coating roller is 115m/min, the roller speed of a material carrying roller is 75m/min, the roller pressure of the coating roller is 180kg, and the roller pressure of the material carrying roller is 1900 kg; the viscosity value of the fine coating back surface is 22 seconds (25 ℃, Zahn #4 cups), the roller speed of a coating roller is 125m/min, the roller speed of a material carrying roller is 55m/min, and the roller pressure of the material carrying roller is 1850 kg; the primary coating temperature PMT was 236 ℃ and the fine coating temperature PMT was 254 ℃.
Example 6: the film thicknesses of the primer surface and the topcoat surface of the product are respectively designed to be 20 microns and 20 microns, and the film thicknesses of the primer surface and the topcoat surface of the product are respectively designed to be 7 microns and 18 microns. The process speed of the unit is 75 m/min; the conductivity of the chemical coating process is 13ms/cm, the chemical coating temperature is 205 ℃, the roller speed of an upper surface coating roller is 108m/min, the roller speed of a material carrying roller is 50m/min, the A/P pressure is 225kg, the roller speed of a lower surface coating roller is 110m/min, the roller speed of the material carrying roller is 50m/min, and the A/P pressure is 230 kg; primary coating of the front surface by raw paint, wherein the roller speed of a coating roller is 122m/min, the roller speed of a material carrying roller is 72m/min, the roller pressure of the coating roller is 185kg, and the roller pressure of the material carrying roller is 1650 kg; the viscosity value of the primary coating back surface is 11 seconds (25 ℃, Zahn #4 cup), the roller speed of a coating roller is 112m/min, the roller speed of a material carrying roller is 72m/min, and the roller pressure of the material carrying roller is 1750 kg; the surface viscosity of the finish coating is 26 seconds (25 ℃, Zahn #4 cup), the roller speed of the coating roller is 105m/min, the roller speed of the material carrying roller is 73m/min, the roller pressure of the coating roller is 175kg, and the roller pressure of the material carrying roller is 1950 kg; the viscosity value of the fine coating back surface is 24 seconds (25 ℃, Zahn #4 cups), the roller speed of a coating roller is 122m/min, the roller speed of a material carrying roller is 52m/min, and the roller pressure of the material carrying roller is 1850 kg; the primary coating temperature PMT was 236 ℃ and the fine coating temperature PMT was 254 ℃.
After production as in the above examples, the color-coated sheets were sampled. And selecting the color-coated plates which are not produced by the invention as comparative examples 1, 2 and 3. The total film thickness of the upper surface and the lower surface of all fluorocarbon color-coated sheets and the performance of the upper surface coating of the fluorocarbon color-coated sheets in the examples and the comparative examples are respectively tested, and the results are shown in the following table 2.
TABLE 2 fluorocarbon chromium-free thick coating color coated sheet product test results
The test results show that: after the method is implemented, the surface quality of the product is excellent, please refer to fig. 2, no pinholes or air holes exist, the film thickness reaches the standard, the pencil hardness of the upper surface of the product is stabilized at HB, part of the pencil hardness is improved to F, the interlayer adhesion is improved from HB to B, the T bending performance is improved to 2T-3T, the aging T bending performance is improved to 3T-4T, and other coating performances such as the color difference, the glossiness, the reverse impact resistance, the MEK wiping resistance and the like of the product all meet the product performance requirements of the fluorocarbon color coating.
Before the invention is implemented, the film thickness of the double-sided fluorocarbon chromium-free super-thick color coating product can reach the standard, but the product has the defect of a pinhole on the whole plate surface, please refer to fig. 3, the pencil hardness and the interlayer adhesive force of the upper surface of the product are poor, the T bending performance is in a lower level, and the aging T bending performance is unqualified.
Therefore, the technical scheme provided by the embodiment of the invention at least has the following technical effects or advantages:
1. the invention overcomes the influence of the full-flow chromium-free process on the corrosion resistance of the product and the problems of plate surface bubbles and shrinkage cavities easily generated by the matching of the chromium-free primer and the finish, and develops the 40/25 micron double-sided fluorocarbon chromium-free super-thick coating color coated plate by elaborately designing the film thickness and controlling the chemical coating process, the roller coating process and the baking process. The method can realize two-time coating, namely, the super-thick coating with the film thickness of 50 mu m at most on the front surface, and can reach the film thickness level of 75-100 mu m higher by using roller coating three times or four times.
2. The preparation method can ensure that the process speed of the unit is 70-80m/min, greatly improves the process speed of the highest 60m/min of thick fluorocarbon varieties in the early stage, and can effectively improve the production efficiency.
3. By implementing the invention, the fluorocarbon chromium-free super-thick coating color-coated plate has good surface quality, is improved from the full plate surface pinhole in the early stage to have good surface quality, and has no shrinkage cavity and air holes. The hardness of the pencil on the upper surface of the product is stabilized at HB, part of the pencil is improved to F, the interlayer adhesion is improved from HB to B, the T bending property is improved from 4T to 2T-3T, the aging T bending property is improved from 5T-6T to 3T-4T, and the color difference, the glossiness, the reverse impact, the MEK wiping resistance and other coating properties of the product meet the product performance requirements of the fluorocarbon color coating. The method is applied to the user side, the user feedback is good, and the user can be recognized consistently.
Although the invention has been described herein with reference to the illustrated embodiments thereof, which are intended to be the only preferred embodiments of the invention, it is not intended that the invention be limited thereto, since many other modifications and embodiments will be apparent to those skilled in the art and will be within the spirit and scope of the principles of this disclosure.
Claims (10)
1. A preparation method of a color-coated plate is characterized by comprising the following steps:
pretreating the color-coated substrate by adopting a chromium-free solvent to form a passivation layer on the surface of the color-coated substrate;
primarily coating the chromium-free primer on the passivation layer, and baking at a first temperature to form a primer surface;
and finely coating the fluorocarbon coating on the primer surface, baking at a second temperature to form a surface coating surface, and preparing a color-coated plate, wherein the first temperature and the second temperature are represented as the temperature of the color-coated substrate during baking, and the first temperature is at least 13 ℃ lower than the second temperature.
2. The method of making a color-coated sheet according to claim 1, wherein the step of pretreating the color-coated substrate with a chromium-free solvent provides an electrical conductivity of 12 ± 2 ms/cm.
3. The method of claim 1, wherein the color-coated substrate is a strip steel, and the strip steel is pretreated by a chemical coater; the pretreatment step comprises the following steps:
controlling the traction speed of the strip steel to be 70-80 m/min;
the chemical coating machine is configured with a chemical coating temperature of 190-210 ℃ and a strip steel temperature of 70-80 ℃, the upper surface and the lower surface of the strip steel are pretreated by the chromium-free solvent containing titanium ions, and the titanium content in the pretreated passivation layer is 3-6mg/m 2 。
4. The method of manufacturing a color-coated sheet according to claim 3, wherein in the step of pretreating the upper and lower surfaces of the strip,
the roller speed of a coating roller of the chemical coating machine is 98-112m/min, the roller speed of a material taking roller is 49-56m/min, and the pressure of the coating roller and the material taking roller is 1000-2500N.
5. The method of claim 1, wherein the color-coated substrate is a strip steel, and the passivation layer comprises an upper surface and a lower surface of the strip steel; priming the passivation layer with a chromium-free primer comprising:
primarily coating the chromium-free primer to the upper surface and the lower surface through a coating roller and a nip roller; wherein, when the upper surface is primarily coated, the rotating speed of the coating roller is 130m/min for 120-; when the lower surface is primarily coated, the viscosity of the chrome-free primer at 25 ℃ of Zehn cup #4 is 8-12s, the rotating speed of the coating roller is 110-75 m/min, the traction speed of the strip steel is 65-75m/min, and the pressure of the pressure roller is 1600-2000N.
6. The method of manufacturing a color-coated sheet according to claim 1, wherein the color-coated substrate is a strip steel, and the primer surface includes an upper surface and a lower surface of the strip steel; finish coating a fluorocarbon coating to the primer surface, comprising:
finely coating the fluorocarbon coating to the upper surface and the lower surface through a coating roller and a material pressing roller; when the upper surface is finely coated, the viscosity of the fluorocarbon coating at 25 ℃ Chuanyn cup #4 is 20-28s, the rotating speed of the coating roller is 100-120m/min, the traction speed of the strip steel is 60-80m/min, the pressure of the coating roller is 1000-3000N, and the pressure of the material pressing roller is 16000-20000N; when the lower surface is finely coated, the viscosity of the fluorocarbon coating at 25 ℃ of Zehn cup #4 is 20-28s, the rotating speed of the coating roller is 120-130m/min, the traction speed of the strip steel is 50-70m/min, and the pressure of the nip roll is 16000-20000N.
7. The method as claimed in claim 1, wherein the color-coated substrate is a strip steel, the first temperature is 232-241 ℃ and the second temperature is 249-254 ℃.
8. The method for preparing a color-coated sheet according to claim 7, wherein the color-coated sheet is prepared by continuously baking the strip steel in a baking oven at a pulling speed of 70-80 m/min;
when the first temperature is 232-241 ℃, the temperature of the first baking area of the baking furnace is 245-250 ℃, and the temperature of the second baking area to the fifth baking area is 280-285 ℃;
when the second temperature is 232-.
9. A color-coated sheet produced by the method of any one of claims 1 to 8, wherein the top coat surface comprises at least one layer.
10. The color-coated sheet according to claim 9, wherein the thickness of the primer surface and the thickness of the topcoat surface of the upper surface of the color-coated sheet are both 20-25 μm, the thickness of the primer surface of the lower surface of the color-coated sheet is 7-10 μm, and the thickness of the topcoat surface is 18-20 μm.
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