Multilayer composite fine steel anticorrosive steel-plastic plate and preparation method thereof

Abstract

The invention relates to the technical field of multi-layer composite steel-plastic plates, and in particular to a multi-layer composite fine steel anti-corrosion steel-plastic plate and a preparation method thereof. The invention prepares the multi-layer composite fine steel anti-corrosion steel-plastic plate by heating, laminating and rolling a polymer hot-melt adhesive layer in a prepared weather-resistant and corrosion-resistant PET back film and a galvanized layer of a galvanized plate through an upper roller, and then heating, laminating and rolling the galvanized layer laminated with the back film and the polymer hot-melt adhesive layer of the weather-resistant and corrosion-resistant PET front film through an upper roller; then, detecting the roughness parameters of the surface of the multi-layer composite fine steel anti-corrosion steel-plastic plate to obtain the average roughness and the maximum peak-to-valley height; finally, determining the reason why the surface quality of the multi-layer composite fine steel anti-corrosion steel-plastic plate does not meet the standard according to the average roughness, and adjusting the heating temperature of the upper roller or the vertical distance between the upper roller and the lower roller according to the reason, thereby improving the anti-corrosion performance and preparation efficiency of the multi-layer composite fine steel anti-corrosion steel-plastic plate.

Description

Technical Field

[0001] The invention relates to the technical field of multi-layer composites, and in particular to a multi-layer composite fine steel anti-corrosion steel-plastic plate and a preparation method thereof. Background Art

[0002] Fine steel anti-corrosion steel-plastic panels can be prepared into anti-corrosion factory roof tiles, which are widely used in industrial factory roofs and walls in corrosive environments, including steel mills, smelters, and chemical plants. They are rust-proof and water-tight, have high strength, and have a long service life.

[0003] Chinese Patent Publication No.: CN 216330645U discloses a new type of anti-corrosion and heat-insulating fine steel coated tile; with high-strength steel plate as the substrate, composite anti-corrosion and heat-insulating composite materials are laminated on both sides to achieve energy-saving and environmentally friendly building materials products that integrate long-lasting anti-corrosion and efficient heat insulation. The light-blocking layer uses alloy aluminum foil to reduce light transmittance, and now most of the sunlight is isolated from the outside. The first heat-insulating layer and the second heat-insulating layer use photofunctional polymer materials, which can transmit, absorb, store and convert light, and further absorb heat from sunlight. The first chemical treatment layer and the second chemical treatment layer can absorb chemical media to ensure that the chemical media will not invade the substrate and affect the overall structural strength. The galvanizing treatment of the first anti-corrosion layer and the second anti-corrosion layer can prevent the steel plate surface from being corroded, and can extend the service life of the steel plate. However, the present invention does not solve the problem of low preparation efficiency of the anti-corrosion and heat-insulating fine steel coating. Summary of the invention

[0004] To this end, the present invention provides a multi-layer composite fine steel anti-corrosion steel-plastic plate and a preparation method thereof, so as to overcome the problem of low surface quality of the multi-layer composite fine steel anti-corrosion steel-plastic plate in the prior art resulting in low preparation efficiency.

[0005] To achieve the above object, the present invention provides a method for preparing a multi-layer composite fine steel anti-corrosion steel-plastic plate, comprising:

[0006] The high molecular hot melt adhesive layer of the weather-resistant and anti-corrosion PET back film and the galvanized sheet are heated and rolled up by an upper roller to prepare a steel-plastic composite board;

[0007] The galvanized layer of the steel-plastic composite plate and the high molecular hot melt adhesive layer of the weather-resistant and anti-corrosion PET front film are heated, laminated and rolled up by an upper roller to prepare a multi-layer composite fine steel anti-corrosion steel-plastic plate;

[0008] Detecting the roughness parameters of the surface of the multi-layer composite fine steel anti-corrosion steel-plastic plate, wherein the roughness parameters include average roughness and maximum peak-to-valley height;

[0009] Determine whether the surface quality of the multi-layer composite fine steel anti-corrosion steel-plastic plate meets the standard according to the average roughness;

[0010] If the surface quality of the multi-layer composite fine steel anti-corrosion steel-plastic plate does not meet the standard, a secondary determination is made based on the maximum peak-to-valley height. If the secondary determination shows that the surface quality of the multi-layer composite fine steel anti-corrosion steel-plastic plate does not meet the standard, the temperature of the upper roller heating is adjusted;

[0011] The reason why the surface quality of the multi-layer composite fine steel anti-corrosion steel-plastic plate does not meet the standard is determined based on the average roughness, and the treatment method includes adjusting the heating temperature of the upper roller and adjusting the vertical distance between the upper roller and the lower roller.

[0012] Furthermore, the preparation of the weather-resistant and anti-corrosion PET front film includes:

[0013] Use an anilox roller to print the PVDF layer on one side of the weather-resistant and anti-corrosion PET layer;

[0014] Heat and bond the PVDF layer to the polymer hot melt adhesive layer;

[0015] Printing a weather-resistant coating layer on the other side of the weather-resistant and anti-corrosion PET layer using an anilox roller;

[0016] The weather-resistant coating layer is anilox-rolled to print a protective ink layer to prepare a weather-resistant and anti-corrosion PET front film.

[0017] Furthermore, the preparation of the galvanized sheet includes vacuum electroplating galvanizing on the upper surface and the lower surface of the steel sheet layer to prepare the galvanized sheet.

[0018] Furthermore, the preparation of the weather-resistant and anti-corrosion PET backside film includes heating and bonding a weather-resistant and anti-corrosion PET layer and a polymer hot-melt adhesive layer to prepare the weather-resistant and anti-corrosion PET backside film.

[0019] Further, judging whether the surface quality of the multi-layer composite fine steel anti-corrosion steel-plastic plate meets the standard according to the average roughness includes:

[0020] If the average roughness is greater than the preset first roughness and less than or equal to the preset second roughness, it is preliminarily determined that the surface quality of the multi-layer composite fine steel anti-corrosion steel-plastic plate does not meet the standard, and based on the maximum peak-to-valley height, it is secondarily determined whether the surface quality of the multi-layer composite fine steel anti-corrosion steel-plastic plate meets the standard;

[0021] If the average roughness is greater than the preset second roughness, it is determined that the surface quality of the multi-layer composite fine steel anti-corrosion steel-plastic plate does not meet the standard, and the reason why the surface quality of the multi-layer composite fine steel anti-corrosion steel-plastic plate does not meet the standard is determined based on the average roughness.

[0022] Further, based on the average roughness, the reason why the surface quality of the multi-layer composite fine steel anti-corrosion steel-plastic plate does not meet the standard is determined and processed, and the processing method includes:

[0023] If the first average roughness difference is less than or equal to the preset roughness difference, adjusting the temperature of the upper roller heating;

[0024] If the first average roughness difference is greater than the preset roughness difference, adjusting the vertical distance between the upper roller and the lower roller;

[0025] The first average roughness difference is the difference between the average roughness and the preset first roughness.

[0026] Furthermore, the temperature of the upper roller heating is adjusted according to the ratio of the average roughness to the preset second roughness; the ratio of the average roughness to the preset second roughness is negatively correlated with the temperature of the upper roller heating.

[0027] Furthermore, the vertical distance between the upper roller and the lower roller is adjusted according to the ratio of the second average roughness difference to the preset second roughness; the second average roughness difference is the difference between the average roughness and the preset second roughness.

[0028] Further, secondarily determining whether the surface quality of the multi-layer composite fine steel anti-corrosion steel-plastic plate meets the standard according to the maximum peak-to-valley height, including comparing the maximum peak-to-valley height with a preset peak-to-valley height;

[0029] If the maximum peak-to-valley height is greater than the preset peak-to-valley height, it is determined for the second time that the surface quality of the multi-layer composite fine steel anti-corrosion steel-plastic plate does not meet the standard, and the upper roller heating temperature is adjusted according to the difference between the maximum peak-to-valley height and the preset peak-to-valley height; the difference between the maximum peak-to-valley height and the preset peak-to-valley height is positively correlated with the upper roller heating temperature.

[0030] The present invention also provides a multi-layer composite fine steel anti-corrosion steel-plastic plate, comprising: a first weather-resistant anti-corrosion PET layer, a first polymer hot-melt adhesive layer, a first galvanized layer, a steel plate layer, a second galvanized layer, a second polymer hot-melt adhesive layer, a PVDF layer, a second weather-resistant anti-corrosion PET layer, a weather-resistant coating layer and a protective ink layer are arranged in sequence from top to bottom.

[0031] Compared with the prior art, the beneficial effect of the present invention lies in that the present invention detects the average roughness and maximum peak-to-valley height of the surface of the multi-layer composite fine steel anti-corrosion steel-plastic plate by setting a roughness meter, and determines whether the surface quality of the multi-layer composite fine steel anti-corrosion steel-plastic plate meets the standard according to the average roughness detected by the roughness meter. If the surface quality of the multi-layer composite fine steel anti-corrosion steel-plastic plate does not meet the standard, a treatment method for the reason for not meeting the standard is determined according to the average roughness, and the treatment method includes adjusting the temperature of the heating roller and adjusting the vertical distance between the upper roller and the lower roller, thereby improving the surface quality of the multi-layer composite fine steel anti-corrosion steel-plastic plate, thereby further improving the anti-corrosion performance and preparation efficiency of the multi-layer composite fine steel anti-corrosion steel-plastic plate.

[0032] Furthermore, the present invention reduces the occurrence of surface deformation and wrinkling of the multi-layer composite fine steel anti-corrosion plastic plate due to high upper roller heating temperature, which leads to a decrease in anti-corrosion performance, by adjusting the heating temperature of the upper roller, thereby improving the anti-corrosion performance and preparation efficiency of the multi-layer composite fine steel anti-corrosion steel-plastic plate.

[0033] Furthermore, the present invention reduces the occurrence of a situation in which the vertical distance between the upper roller and the lower roller is large, resulting in the multi-layer composite fine steel anti-corrosion plastic plate not fitting tightly enough, by adjusting the vertical distance between the upper roller and the lower roller, thereby improving the anti-corrosion performance and preparation efficiency of the multi-layer composite fine steel anti-corrosion steel-plastic plate.

[0034] Furthermore, the refined steel anti-corrosion steel-plastic plate of the present invention has anti-corrosion functional films on both sides to isolate sunlight and oxygen, prevent corrosive gases and water vapor from invading, and can effectively protect the substrate and prevent rust and water leakage.

[0035] Furthermore, the refined steel anti-corrosion steel-plastic plate of the present invention uses a combination of steel and polymer resin, integrating the advantages of resin tiles and color steel tiles. It has the advantage of resin not rusting and retains the advantage of high strength of color steel plates. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a structural diagram of the discharge end of the multi-layer composite fine steel anti-corrosion steel-plastic plate according to an embodiment of the present invention;

[0037] Figure 2 It is a side view of the rolled end of the multi-layer composite fine steel anti-corrosion steel-plastic plate according to an embodiment of the present invention;

[0038] Figure 3 A cross-sectional view of the vertical distance between the upper roller and the lower roller of the laminating machine according to an embodiment of the present invention;

[0039] Figure 4 This is a flow chart of the steps of the method for preparing the multi-layer composite fine steel anti-corrosion steel-plastic plate according to an embodiment of the present invention;

[0040] Figure 5 This is a schematic diagram of the structure of a multi-layer composite fine steel anti-corrosion steel-plastic plate according to an embodiment of the present invention;

[0041] The accompanying drawings are described as follows: 001-first unloading end, 002-second unloading end, 003-upper roller, 004-lower roller, 005-roughness meter, 006-winding end, 1-steel plate layer, 2-first galvanized layer, 3-first polymer hot melt adhesive layer, 4-first weather-resistant and anti-corrosion PET layer, 5-second galvanized layer, 6-second polymer hot melt adhesive layer, 7-PVDF layer, 8-second weather-resistant and anti-corrosion PET layer, 9-weather-resistant coating layer, 10-protective ink layer. DETAILED DESCRIPTION

[0042] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0043] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0044] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside", "outside" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0045] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] See also Figures 1 to 5 , which are respectively a structural diagram of the discharge end of the multi-layer composite fine steel anti-corrosion steel-plastic plate according to an embodiment of the present invention; a side view of the winding end of the multi-layer composite fine steel anti-corrosion steel-plastic plate according to an embodiment of the present invention; a cross-sectional view of the vertical distance between the upper roller and the lower roller of the laminating machine according to an embodiment of the present invention; a step flow chart of the preparation method of the multi-layer composite fine steel anti-corrosion steel-plastic plate according to an embodiment of the present invention; a structural schematic diagram of the multi-layer composite fine steel anti-corrosion steel-plastic plate according to an embodiment of the present invention; a preparation method of a multi-layer composite fine steel anti-corrosion steel-plastic plate according to the present invention, comprising:

[0047] Step S1, heating and laminating the high molecular hot melt adhesive layer of the weather-resistant and anti-corrosion PET back film and the galvanized sheet through an upper roller to prepare a steel-plastic composite board;

[0048] Step S2, heating and laminating the galvanized layer of the steel-plastic composite plate and the high molecular hot melt adhesive layer of the weather-resistant and anti-corrosion PET front film through an upper roller to prepare a multi-layer composite fine steel anti-corrosion steel-plastic plate;

[0049] Step S3, detecting the roughness parameters of the surface of the multi-layer composite fine steel anti-corrosion steel-plastic plate, wherein the roughness parameters include average roughness and maximum peak-to-valley height;

[0050] Step S4, judging whether the surface quality of the multi-layer composite refined steel anti-corrosion steel-plastic plate meets the standard according to the average roughness;

[0051] Step S5, if the surface quality of the multi-layer composite fine steel anti-corrosion steel-plastic plate does not meet the standard, a secondary determination is made based on the maximum peak-to-valley height, and if the secondary determination shows that the surface quality of the multi-layer composite fine steel anti-corrosion steel-plastic plate does not meet the standard, the temperature of the upper roller heating is adjusted;

[0052] Step S6, based on the average roughness, determine the reason why the surface quality of the multi-layer composite fine steel anti-corrosion steel-plastic plate does not meet the standard, the treatment method includes adjusting the heating temperature of the upper roller and adjusting the vertical distance between the upper roller and the lower roller.

[0053] During implementation, the weather-resistant and anti-corrosion PET back film of step S1 is placed at the first unloading end 001, the galvanized sheet is placed at the second unloading end 002, the surface of the first galvanized layer 2 of the galvanized sheet and the first polymer hot-melt adhesive layer 3 of the weather-resistant and anti-corrosion PET back film are heated, bonded and rolled to prepare a steel-plastic composite panel; wherein the galvanized sheet is placed at the second unloading end 002 for unwinding, and is sequentially degreased, washed and purified with water, and water-cooled, and then dried at a temperature of 180°C.

[0054] During implementation, the second galvanized layer 5 of the steel-plastic composite board and the second polymer hot-melt adhesive layer 6 of the weather-resistant and anti-corrosion PET front film in step S2 are heated, laminated and rolled to the rolling end 006 to prepare a multi-layer composite fine steel anti-corrosion steel-plastic board; wherein the heating and laminating process includes laminating the second polymer hot-melt adhesive layer of the weather-resistant and anti-corrosion PET front film to the steel-plastic composite board through a laminating machine, and the laminating temperature is 180°C~200°C.

[0055] In the implementation, the roughness meter 005 of step S3 is installed at the winding end of the laminating machine to detect the roughness parameters of the surface of the multi-layer composite fine steel anti-corrosion steel plastic plate, and the roughness parameters include the average roughness and the maximum peak-to-valley height;

[0056] During implementation, step S6 determines the treatment method for the reason why the surface quality of the multi-layer composite fine steel anti-corrosion steel-plastic plate does not meet the standards based on the average roughness, and adjusts the heating temperature of the upper roller 003 and the vertical distance between the upper roller 003 and the lower roller 004 according to the treatment method for the reason why the surface quality does not meet the standards.

[0057] Specifically, the preparation of the weather-resistant and anti-corrosion PET front film includes:

[0058] Print the PVDF layer 7 on one side of the second weather-resistant and corrosion-resistant PET layer 8 using an anilox roller;

[0059] The PVDF layer 7 and the second polymer hot melt adhesive layer 6 are heated and bonded together;

[0060] Print a weather-resistant coating layer 9 on the other side of the second weather-resistant and anti-corrosion PET layer 8 using an anilox roller;

[0061] The weather-resistant coating layer 9 is anilox-rolled to print the protective ink layer 10 to prepare a weather-resistant and anti-corrosion PET front film.

[0062] During implementation, a weather-resistant and anti-corrosion PET with a thickness of 36 μm is placed at the discharge end, wherein the second weather-resistant and anti-corrosion PET layer 8 is passed through a 200-mesh anilox roller to print the PVDF layer 7, and the PVDF layer slurry is baked in the first oven at 80°C; the weather-resistant coating layer 9 is passed through a 175-mesh anilox roller to print the weather-resistant coating layer slurry is baked in the second oven at 90°C; then, the protective ink layer 10 is passed through a 150-mesh anilox roller to print the protective ink layer slurry, and the protective ink layer slurry is baked in the third oven at 100°C; it is dried in three horizontal ovens in sequence and then rolled up; finally, the printed weather-resistant and anti-corrosion PET printed film is bonded to the polymer hot melt adhesive layer.

[0063] Specifically, the preparation of the galvanized sheet includes vacuum electroplating galvanizing the upper surface and the lower surface of the steel sheet layer to prepare the galvanized sheet.

[0064] Specifically, the preparation of the weather-resistant and anti-corrosion PET back film includes heating and bonding the weather-resistant and anti-corrosion PET layer and the first polymer hot-melt adhesive layer to prepare the weather-resistant and anti-corrosion PET back film.

[0065] During implementation, a weather-resistant and anti-corrosion PET with a thickness of 38 μm was placed at the discharge end, coated with glue by a 100-mesh anilox roller, and then dried in a 7-section oven, the oven temperatures of which were 60°C, 70°C, 80°C, 90°C, 80°C, 70°C, and 60°C respectively. After coming out of the oven, it passed through a composite roller at 80°C to bond the weather-resistant and anti-corrosion PET with a 50 μm thick polymer hot melt adhesive layer, and then was rolled up.

[0066] Please continue reading Figure 5 As shown, it is a schematic diagram of the structure of the multi-layer composite fine steel anti-corrosion steel-plastic plate according to an embodiment of the present invention. The multi-layer composite fine steel anti-corrosion steel-plastic plate structure according to the embodiment of the present invention is sequentially arranged from top to bottom with a first weather-resistant anti-corrosion PET layer 4, a first polymer hot-melt adhesive layer 3, a first galvanized layer 2, a steel plate layer 1, a second galvanized layer 5, a second polymer hot-melt adhesive layer 6, a PVDF layer 7, a second weather-resistant anti-corrosion PET layer 8, a weather-resistant coating layer 9 and a protective ink layer 10.

[0067] Specifically, the anti-corrosion functional films on both sides of the fine steel anti-corrosion steel-plastic plate of the present invention can isolate sunlight and oxygen, prevent corrosive gases and water vapor from invading, and can effectively protect the substrate and prevent rust and water leakage; the anti-corrosion steel-plastic plate of the present invention uses a combination of steel and polymer resin, integrating the advantages of resin tiles and color steel tiles. It has the advantage of resin not rusting and retains the advantage of high strength of color steel plates.

[0068] Specifically, judging whether the surface quality of the multi-layer composite fine steel anti-corrosion steel-plastic plate meets the standard according to the average roughness includes:

[0069] When the average roughness is less than or equal to the preset first roughness, it is determined that the surface quality of the multi-layer composite fine steel anti-corrosion steel-plastic plate meets the standard and continues to monitor;

[0070] When the average roughness is greater than the preset first roughness and less than or equal to the preset second roughness, it is preliminarily determined that the surface quality of the multi-layer composite fine steel anti-corrosion steel-plastic plate does not meet the standard, and based on the maximum peak-to-valley height detected, it is secondary determined whether the surface quality of the multi-layer composite fine steel anti-corrosion steel-plastic plate meets the standard;

[0071] When the average roughness is greater than the preset second roughness, it is determined that the surface quality of the multi-layer composite fine steel anti-corrosion steel-plastic plate does not meet the standard, and the reasons and treatment methods for the surface quality of the multi-layer composite fine steel anti-corrosion steel-plastic plate not meeting the standard are determined based on the average roughness.

[0072] In implementation, the first roughness is preset to 0.8 microns, and the second roughness is preset to 1.2 microns. In the embodiment of the present invention, the higher the anti-corrosion requirement of the multi-layer composite fine steel anti-corrosion steel-plastic plate under the anti-corrosion performance requirement of this application, the smaller the value of the surface roughness is, and the smoother the surface is, because the surface roughness can affect the key properties of the material such as lubrication, wear and fatigue performance, cleanliness and adhesion, and sealing performance. A smooth surface is often beneficial to improving the performance of the material, while too high a surface roughness may lead to a decrease in performance.

[0073] Specifically, a roughness meter is set to detect the average roughness and maximum peak-to-valley height of the surface of the multi-layer composite fine steel anti-corrosion steel-plastic plate, and whether the surface quality of the multi-layer composite fine steel anti-corrosion steel-plastic plate meets the standard is determined according to the average roughness detected by the roughness meter. If it does not meet the standard, the temperature of the upper roller heating and the vertical distance between the upper roller and the lower roller used for bonding are adjusted according to the determined reasons for not meeting the standard, thereby improving the anti-corrosion performance and preparation efficiency of the multi-layer composite fine steel anti-corrosion steel-plastic plate.

[0074] Specifically, based on the average roughness, the reasons why the surface quality of the multi-layer composite fine steel anti-corrosion steel-plastic plate does not meet the standards are determined and dealt with, and the treatment methods include:

[0075] When the difference between the average roughness and the preset second roughness is less than or equal to the preset roughness difference, it is determined that the reason for non-compliance with the standard is that the surface of the multi-layer composite fine steel anti-corrosion plastic plate is deformed and wrinkled due to the high temperature of the upper roller heating, and the temperature of the upper roller heating is adjusted;

[0076] When the difference between the average roughness and the preset second roughness is greater than the preset roughness difference, it is determined that the reason for non-compliance with the standard is that the composite surface is too rough, the glue penetrates more into the tiny pores and pits, causing the overall thinning of the glue layer, resulting in the multi-layer composite fine steel anti-corrosion plastic plate not fitting tightly enough, and the vertical distance between the upper roller and the lower roller is adjusted;

[0077] In implementation, the preset average roughness difference is 0.05 micrometers.

[0078] Specifically, the temperature of the upper roller heating is adjusted according to the ratio of the average roughness to the preset second roughness; the ratio of the average roughness to the preset second roughness is negatively correlated with the temperature of the upper roller heating, including,

[0079] When the ratio of the average roughness to the preset second roughness is less than or equal to the preset first roughness ratio, adjusting the temperature of the temperature controller for heating the upper roller to 200° C.;

[0080] When the ratio of the average roughness to the preset second roughness is greater than the preset first roughness ratio and less than or equal to the preset second roughness ratio, adjusting the temperature of the temperature controller for heating the upper roller to 190° C.;

[0081] When the ratio of the average roughness to the preset second roughness is greater than the preset second roughness ratio, the temperature of the temperature controller for heating the upper roller is adjusted to 180°C.

[0082] Specifically, in the embodiment of the present invention, the preset first roughness ratio is 80%, and the preset second roughness ratio is 90%. The adjustment of the upper roller heating temperature reduces the average roughness of the surface of the multi-layer composite fine steel anti-corrosion steel-plastic plate caused by the deformation and wrinkles of the weather-resistant and corrosion-resistant PET surface caused by the excessively high bonding temperature, resulting in a decrease in the anti-corrosion performance of the multi-layer composite fine steel anti-corrosion steel-plastic plate.

[0083] Specifically, the vertical distance between the upper roller and the lower roller is adjusted according to the ratio of the second average roughness difference to the preset second roughness, and the processing method also includes:

[0084] When the ratio of the second average roughness difference to the preset second roughness is less than or equal to the preset first roughness difference ratio, the vertical distance between the upper roller and the lower roller is adjusted to a corresponding value using the first spacing adjustment coefficient α1;

[0085] When the ratio of the second average roughness difference to the preset second roughness is greater than the preset first roughness difference ratio and less than or equal to the preset second roughness difference ratio, the vertical distance between the upper roller and the lower roller is adjusted to a corresponding value using the second spacing adjustment coefficient α2;

[0086] When the ratio of the second average roughness difference to the preset second roughness is greater than the preset second roughness difference ratio, the vertical distance between the upper roller and the lower roller is adjusted to a corresponding value using the third spacing adjustment coefficient α3;

[0087] Among them, the second difference in average roughness is the difference between the average roughness and the preset second roughness; in the embodiment of the present invention, the preferred embodiment of the preset first roughness difference ratio is 0.5%, and the preferred embodiment of the preset second roughness difference ratio is 10%; in the embodiment, the adjustment formula used is: S=s×αn, wherein s is the vertical distance between the upper roller and the lower roller before adjustment, and the preferred embodiment is 0.52mm, S is the vertical distance between the upper roller and the lower roller after adjustment, and αn is the nth spacing adjustment coefficient, setting n=1, 2, 3; the preferred embodiments of α1, α2 and α3 are: α1=0.98; α2=0.95; α3=0.90.

[0088] Specifically, secondarily determining whether the surface quality of the multi-layer composite fine steel anti-corrosion steel-plastic plate meets the standard according to the maximum peak-to-valley height includes: comparing the maximum peak-to-valley height with a preset peak-to-valley height;

[0089] If the maximum peak-to-valley height is less than or equal to the preset peak-to-valley height, it is determined that the surface quality of the multi-layer composite fine steel anti-corrosion plastic plate meets the standard for the second time, and the test is continued;

[0090] If the maximum peak-to-valley height is greater than the preset peak-to-valley height, it is determined for the second time that the surface quality of the multi-layer composite fine steel anti-corrosion steel-plastic plate does not meet the standard, and the upper roller heating temperature is adjusted according to the difference between the maximum peak-to-valley height and the preset peak-to-valley height; the difference in the maximum peak-to-valley height is positively correlated with the upper roller heating temperature.

[0091] In the embodiment of the present invention, the maximum peak-to-valley height, an evaluation parameter of surface roughness, refers to the maximum height difference between the peak and the valley in the roughness profile with a measuring length of L; the preset peak-to-valley height is 5 microns.

[0092] Specifically, the temperature of the upper roller heating is adjusted according to the difference between the maximum peak-to-valley height and the preset peak-to-valley height.

[0093] When the difference between the maximum peak-to-valley height and the preset peak-to-valley height is less than or equal to the preset first peak-to-valley height difference, the upper roller heating temperature is adjusted to 195° C.;

[0094] When the difference between the maximum peak-to-valley height and the preset peak-to-valley height is greater than the preset first peak-to-valley height difference and less than or equal to the preset second peak-to-valley height difference, adjusting the upper roller heating temperature to 200° C.;

[0095] When the maximum peak-to-valley height difference is greater than the preset second peak-to-valley height difference, the upper roller heating temperature is adjusted to 205°C; wherein, in the embodiment of the present invention, the preset first peak-to-valley height difference is 0.05 microns, and the preset second peak-to-valley height difference is 0.07 microns.

[0096] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A method for preparing a multi-layer composite fine steel anti-corrosion steel-plastic plate, characterized in that: include: The high molecular hot melt adhesive layer of the weather-resistant and anti-corrosion PET back film and the galvanized sheet are heated and rolled up by an upper roller to prepare a steel-plastic composite board; The galvanized layer of the steel-plastic composite plate and the high molecular hot melt adhesive layer of the weather-resistant and anti-corrosion PET front film are heated, laminated and rolled up by an upper roller to prepare a multi-layer composite fine steel anti-corrosion steel-plastic plate; Detecting the roughness parameters of the surface of the multi-layer composite fine steel anti-corrosion steel-plastic plate, wherein the roughness parameters include average roughness and maximum peak-to-valley height; Judging whether the surface quality of the multi-layer composite fine steel anti-corrosion steel-plastic plate meets the standard according to the average roughness includes: If the average roughness is less than or equal to the preset first roughness, it is determined that the surface quality of the multi-layer composite fine steel anti-corrosion steel-plastic plate meets the standard; If the average roughness is greater than the preset first roughness and less than or equal to the preset second roughness, it is preliminarily determined that the surface quality of the multi-layer composite fine steel anti-corrosion steel-plastic plate does not meet the standard, and based on the maximum peak-to-valley height, it is secondarily determined whether the surface quality of the multi-layer composite fine steel anti-corrosion steel-plastic plate meets the standard; If the average roughness is greater than the preset second roughness, it is determined that the surface quality of the multi-layer composite fine steel anti-corrosion steel-plastic plate does not meet the standard, and the reason why the surface quality of the multi-layer composite fine steel anti-corrosion steel-plastic plate does not meet the standard is determined based on the average roughness; Secondary determination of whether the surface quality of the multi-layer composite fine steel anti-corrosion steel-plastic plate meets the standard is made based on the maximum peak-to-valley height, including: Comparing the maximum peak-to-valley height with a preset peak-to-valley height; If the maximum peak-to-valley height is greater than the preset peak-to-valley height, it is determined that the surface of the multi-layer composite fine steel anti-corrosion steel-plastic plate does not meet the standard, and the temperature of the upper roller heating is adjusted according to the difference between the maximum peak-to-valley height and the preset peak-to-valley height; the difference between the maximum peak-to-valley height and the preset peak-to-valley height is positively correlated with the temperature of the upper roller heating; When the average roughness is greater than the preset second roughness, the reason why the surface quality of the multi-layer composite fine steel anti-corrosion steel-plastic plate does not meet the standard is determined based on the average roughness and processed, and the processing method includes: If the first average roughness difference is less than or equal to the preset roughness difference, adjusting the temperature of the upper roller heating; If the first average roughness difference is greater than the preset roughness difference, adjusting the vertical spacing between the upper roller and the lower roller; The first average roughness difference is the difference between the average roughness and the preset first roughness; The temperature of the upper roller heating is adjusted according to the ratio of the average roughness to the preset second roughness; the ratio of the average roughness to the preset second roughness is negatively correlated with the temperature of the upper roller heating, including: When the ratio of the average roughness to the preset second roughness is less than or equal to the preset first roughness ratio, adjusting the temperature of the temperature controller for heating the upper roller to 200° C.; When the ratio of the average roughness to the preset second roughness is greater than the preset first roughness ratio and less than or equal to the preset second roughness ratio, adjusting the temperature of the temperature controller for heating the upper roller to 190° C.; When the ratio of the average roughness to the preset second roughness is greater than the preset second roughness ratio, the temperature of the temperature controller for heating the upper roller is adjusted to 180°C.

2. The method for preparing the multi-layer composite fine steel anti-corrosion steel-plastic plate according to claim 1, characterized in that: The preparation of the weather-resistant and anti-corrosion PET front film includes: Use an anilox roller to print the PVDF layer on one side of the weather-resistant and anti-corrosion PET layer; Heat and bond the PVDF layer to the polymer hot melt adhesive layer; Printing a weather-resistant dye layer on the other side of the weather-resistant and anti-corrosion PET layer using an anilox roller; The weather-resistant dye layer is anilox roller-printed to protect the ink layer to prepare a weather-resistant and anti-corrosion PET front film.

3. The method for preparing the multi-layer composite fine steel anti-corrosion steel-plastic plate according to claim 2, characterized in that: The processing method also includes: adjusting the vertical distance between the upper roller and the lower roller according to the ratio of the second average roughness difference to the preset second roughness: When the ratio of the second average roughness difference to the preset second roughness is less than or equal to the preset first roughness difference ratio, the vertical distance between the upper roller and the lower roller is adjusted to a corresponding value using the first spacing adjustment coefficient α1; When the ratio of the second average roughness difference to the preset second roughness is greater than the preset first roughness difference ratio and less than or equal to the preset second roughness difference ratio, the vertical distance between the upper roller and the lower roller is adjusted to a corresponding value using the second spacing adjustment coefficient α2; When the ratio of the second average roughness difference to the preset second roughness is greater than the preset second roughness difference ratio, the vertical distance between the upper roller and the lower roller is adjusted to a corresponding value using the third spacing adjustment coefficient α3; The second average roughness difference is the difference between the average roughness and the preset second roughness; The vertical distance between the upper roller and the lower roller after adjustment is calculated according to the following formula: S=s×αn, where s is the vertical distance between the upper roller and the lower roller before adjustment, S is the vertical distance between the upper roller and the lower roller after adjustment, and αn is the nth spacing adjustment coefficient, and n is set to 1, 2, 3.

4. The method for preparing the multi-layer composite fine steel anti-corrosion steel-plastic plate according to claim 3, characterized in that: The preparation of the galvanized sheet includes vacuum electroplating galvanizing the upper surface and the lower surface of the steel sheet layer respectively.

5. The method for preparing the multi-layer composite fine steel anti-corrosion steel-plastic plate according to claim 4, characterized in that: The preparation of the weather-resistant and anti-corrosion PET back film includes heating and bonding the weather-resistant and anti-corrosion PET layer and the polymer hot-melt adhesive layer.

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