CN111251619A - Preparation method of color PET wire drawing film composite steel plate - Google Patents

Preparation method of color PET wire drawing film composite steel plate Download PDF

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Publication number
CN111251619A
CN111251619A CN202010149881.9A CN202010149881A CN111251619A CN 111251619 A CN111251619 A CN 111251619A CN 202010149881 A CN202010149881 A CN 202010149881A CN 111251619 A CN111251619 A CN 111251619A
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pet
film layer
layer
color
film
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CN111251619B (en
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周国庆
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Shandong Jinghong Intelligent Technology Co., Ltd
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Shandong Jinghong Intelligent Technology Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/52—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the way of applying the adhesive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/02—Preparation of the material, in the area to be joined, prior to joining or welding
    • B29C66/026—Chemical pre-treatments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/45—Joining of substantially the whole surface of the articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/74—Joining plastics material to non-plastics material
    • B29C66/742—Joining plastics material to non-plastics material to metals or their alloys
    • B29C66/7428—Transition metals or their alloys
    • B29C66/74283—Iron or alloys of iron, e.g. steel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/18—Layered products comprising a layer of metal comprising iron or steel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
    • B29K2067/003—PET, i.e. poylethylene terephthalate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/06—Coating on the layer surface on metal layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/26—Polymeric coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2266/00—Composition of foam
    • B32B2266/02—Organic
    • B32B2266/0214—Materials belonging to B32B27/00
    • B32B2266/0271—Epoxy resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/306—Resistant to heat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/402—Coloured
    • B32B2307/404—Multi-coloured
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/406—Bright, glossy, shiny surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/552—Fatigue strength
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/714—Inert, i.e. inert to chemical degradation, corrosion

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Laminated Bodies (AREA)

Abstract

The invention relates to the technical field of composite steel plates, in particular to a preparation method of a color PET wire drawing film composite steel plate. Comprises the steps of forming a first and a second passivation layers on a color coated plate, and attaching a PET film layer on the first passivation layer, wherein: the steps of coating the PET film layer are as follows: firstly, a macromolecule bonding film layer is pasted on the lower surface of a PET film layer, then the PET film layer with the macromolecule bonding film layer is pasted on the upper surface of a first passivation layer, when the PET film layer is pasted, the temperature of the PET film layer reaches 92-105 ℃ through a heat conduction film covering steel roller, after the PET film layer is pasted, the temperature is reduced to 20-35 ℃ according to a temperature operation curve, and the pasting is completed. The color PET wiredrawing film composite steel plate obtained by the invention has the advantages of enhanced structural stability, full color, good glossiness, various colors, long service life and no fading, chalking and environmental pollution, and can be kept for a long time, thereby meeting the requirements of modern development.

Description

Preparation method of color PET wire drawing film composite steel plate
Technical Field
The invention relates to the technical field of composite steel plates, in particular to a preparation method of a color PET wire drawing film composite steel plate.
Background
At present, stainless steel wire drawing plates in the household appliance industry are widely used, such as the shells of electric cookers and hot water kettles of small household appliances, and the door plates of refrigerators of large household appliances. However, the stainless steel wire drawing plate has high price, more bad performance, low efficiency, poor glossiness and short service life, and secondly, dust generated in the abrasive belt polishing and wire drawing process of the stainless steel has great harm to the environment and human bodies, wastes abrasive belts and wastes treatment and influences the environment.
In addition, in the process of using the metal steel plate, the metal plate is easy to oxidize and corrode, so that the metal plate needs to be subjected to corrosion prevention and rust prevention treatment. For example, paint is sprayed, but the rust-proof and corrosion-proof performance of the paint is not strong, and the paint is easy to scratch and fall off, so that the service life of the metal steel plate is reduced, and the appearance of the metal steel plate is seriously influenced.
Chinese patent CN108819382A discloses a novel roller-coated film-coated metal plate and a production process thereof. Including metal substrate, metal substrate lower surface even spraying has the second chemical treatment layer, and the second chemical treatment layer lower surface still has the complex coating film layer, metal substrate upper surface even spraying has first chemical treatment layer, and the even spraying of first chemical treatment layer upper surface has the coloured auto-adhesive priming paint layer, coloured auto-adhesive priming paint layer upper surface still is provided with transparent film layer. The invention also provides a production process of the novel roller-coated film-coated metal plate. This patent does not adopt the PET membrane, but at passivation layer upper surface spraying coloured autohension priming paint layer, and coloured autohension priming paint layer upper surface is at the transparent rete of spraying, and this transparent rete is relatively poor in comparison with PET membrane mechanical properties for metal sheet structure poor stability, short-lived, and the glossiness is poor.
Chinese patent CN110481135A discloses a production process of a double-sided film-coated color steel plate for buildings, which comprises the following steps: heating the front surface and the back surface of a substrate coil stock by an oven, forming binder layers on the front surface and the back surface of the substrate coil stock after passing through the oven, coating a front surface film on the front surface of a substrate by an upper heat-conducting film-coated steel roller of the processed substrate coil stock, coating a PET film on the back surface of the substrate by a lower film-coated rubber roller, carrying out cold water spraying and cooling immediately after the two-surface film-coated steel roller is attached, drying front and back surface water spots by a water squeezing roller and hot air blowing after spraying, and cooling to 25-40 ℃ to form a color film layer outside the substrate, wherein a PE protective film is attached to the color film layer at normal temperature. Although the PET film is contained in the patent, after the PET film is pasted, the temperature is directly reduced from 90-100 ℃ to 25-40 ℃, and the temperature is reduced too fast, so that the pasting of the PET film is not tight, the structural stability of the steel plate is poor, the surface has bubbles, the glossiness is poor, and the steel plate is not attractive.
Therefore, it is urgently needed to develop a preparation method of a clad steel plate with various colors, good glossiness, long service life and good structural stability.
Disclosure of Invention
The invention aims to provide a preparation method of a colorful PET wire drawing film composite steel plate, which has the advantages of good structural stability, various colors, full color, good glossiness, stable and reliable quality and long service life.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the preparation method of the color PET wiredrawing film composite steel plate comprises the steps of forming a first passivation layer and a second passivation layer on a color coating plate, and attaching a PET film layer on the first passivation layer, wherein: the steps of coating the PET film layer are as follows: firstly, attaching a polymer bonding film layer to the lower surface of a PET film layer, then attaching the PET film layer with the polymer bonding film layer to the upper surface of a first passivation layer, wherein during attaching, a heat-conducting film-covering steel roller enables the temperature of the PET film layer to reach 92-105 ℃, and after attaching, cooling to 20-35 ℃ according to a temperature operation curve to finish attaching;
the temperature operation curve is that the temperature is firstly reduced to 80-82 ℃ at the cooling rate of 3 ℃/min, and is maintained at 80-82 ℃ for 10-12 min; cooling to 60-62 deg.C at a cooling rate of 2 deg.C/min, and maintaining at 60-62 deg.C for 10-12 min; then heating to 70-72 ℃ at a heating rate of 1 ℃/min, and maintaining at 70-72 ℃ for 8-10 min; finally, the temperature is reduced to 20-35 ℃ at the cooling rate of 2 ℃/min.
The preparation method of the color PET wiredrawing film composite steel plate specifically comprises the following steps:
(1) the method comprises the steps of coating chromium-free passivation solution on the front side and the back side of a galvanized plate in a roller coating mode, and then baking the galvanized plate to form a first passivation layer and a second passivation layer on the front side and the back side of the galvanized plate respectively;
(2) firstly, coating a double-component polyurethane adhesive on the lower surface of a PET film layer in a roller manner to form a high-molecular adhesive film layer, then pasting the PET film layer with the high-molecular adhesive film layer on the upper surface of a first passivation layer through a heat-conducting film-coated steel roller, wherein during pasting, the heat-conducting film-coated steel roller is internally provided with an oil way heating system to enable the surface temperature of the PET film layer to reach 92-105 ℃, and after pasting, cooling to 20-35 ℃ according to a temperature operation curve to finish pasting;
(3) a PE protective film layer is pasted on the upper surface of the PET film layer at the temperature of 20-35 ℃;
(4) coating the epoxy foaming back paint on the surface of the second passivation layer in a roller coating mode, and baking to obtain an epoxy foaming back paint layer;
(5) and spraying cold water on the galvanized sheet coated with the epoxy foaming back paint layer, cooling, and winding in a winding machine to obtain the colorful PET wiredrawing film composite steel plate.
Wherein:
in the step (1), the concentration of the chromium-free passivation solution is 30-55 wt.%, and the using amount is 0.7-2.0g/m2The baking temperature is 220-240 ℃.
In the step (1), the thickness of the galvanized plate is 4-8 μm, preferably 6 μm, the thickness of the first passivation layer and the thickness of the second passivation layer are both 2-4 μm, preferably 3 μm, and the thicknesses of the first passivation layer and the second passivation layer are the same.
In the step (1), the galvanized sheet is pretreated and then is coated with a chromium-free passivation solution in a roller coating mode, and the pretreatment step is that the galvanized sheet is subjected to pre-degreasing, main degreasing and three-time water washing, and then is subjected to hot air blowing to enter a passivation process.
Adding degreasing alkali liquor during pre-degreasing and main degreasing, cleaning stains on the front and back sides of the galvanized plate by using a brush roller, wherein the concentration of alkali liquor free alkali in a degreasing tank is 5-12pt, the temperature in the degreasing tank is 40-70 ℃, after pre-degreasing and cleaning, a water squeezing roller squeezes to dry and then enters main degreasing;
after the main degreasing and cleaning, the water squeezing roller is used for squeezing and then washing, and the three times of washing are pure water washing, wherein the washing temperature is 40-70 ℃.
In the step (2), the PET film layer comprises an upper PET wire drawing film layer, a middle PET color film layer and a lower PET back cover film layer.
The thickness of the PET colored film layer is 3-5 μm, preferably 4 μm; the thickness of the PET wiredrawing film layer is 2-3 μm, preferably 2 μm; the thickness of the PET back cover film layer is 2-3 μm, preferably 3 μm.
In the step (2), the thickness of the polymer adhesive film layer is 2-5 μm, preferably 4 μm.
In the step (3), the thickness of the PE protective film is 0.04-10 μm, preferably 3 μm.
In the step (4), the thickness of the epoxy foaming back paint layer is 3-6 μm, preferably 5 μm.
The color PET wiredrawing film composite steel plate comprises a color coating plate, wherein a first passivation layer and a second passivation layer are respectively arranged on the upper surface and the lower surface of the color coating plate; the upper surface of the first passivation layer is sequentially provided with a polymer bonding film layer, a PET film layer and a PE protection film layer from bottom to top.
The PET film layer comprises a PET color film layer, a PET wire drawing film layer arranged on the upper surface of the PET color film layer and a PET back cover film layer arranged on the lower surface of the PET color film layer; PET wire drawing rete upper surface links to each other with PE protection rete, and PET back cover rete lower surface links to each other with the polymer bonding rete.
And an epoxy foaming back paint layer is arranged on the lower surface of the second passivation layer.
The color coating plate is a galvanized plate.
The chromium-free passivation solution, the degreasing alkali liquor and other substances adopted in the invention are all commercial products.
The invention has the following beneficial effects:
the PET film layer with the polymer bonding film layer is pasted on the upper surface of the first passivation layer through the heat-conducting film-covering steel roller, during pasting, the oil circuit heating system is arranged in the heat-conducting film-covering steel roller to enable the surface temperature of the PET film layer to reach 92-105 ℃, and after pasting, the temperature is reduced to 20-35 ℃ according to the temperature operation curve, and pasting is completed.
The temperature operation curve is as follows: firstly, cooling to 80-82 ℃ at a cooling rate of 3 ℃/min, and maintaining at 80-82 ℃ for 10-12 min; cooling to 60-62 deg.C at a cooling rate of 2 deg.C/min, and maintaining at 60-62 deg.C for 10-12 min; then heating to 70-72 ℃ at a heating rate of 1 ℃/min, and maintaining at 70-72 ℃ for 8-10 min; finally, the temperature is reduced to 20-35 ℃ at the cooling rate of 2 ℃/min.
The invention pastes the PET film layer with the macromolecule adhesive film layer on the upper surface of the first passivation layer, and the surface temperature of the PET film layer reaches 92-105 ℃ during pasting. Because the PET film layer is divided into three layers, after the PET film layer is pasted, the temperature is reduced according to the temperature operation curve, and the PET film layer and the first passivation layer can be pasted more tightly. Firstly, cooling to 80-82 ℃ at a cooling rate of 3 ℃/min, gradually and tightly adhering the PET film layer to the surface of the first passivation layer under the action of the polymer adhesive film layer in the cooling process, and maintaining the temperature at 80-82 ℃ for 10-12min, wherein the adhering effect of the PET film layer on the surface of the first passivation layer can be maintained in the time; cooling to 60-62 ℃ at a cooling rate of 2 ℃/min, maintaining at 60-62 ℃ for 10-12min, and further closely adhering the PET film layer on the surface of the first passivation layer, wherein the PET film layer is completely adhered on the surface of the first passivation layer; then heating to 70-72 ℃ at a heating rate of 1 ℃/min, and maintaining at 70-72 ℃ for 8-10min, wherein the heating process is a heating process, and the heating process can enhance the viscosity of the high-molecular bonding film layer and further increase the bonding strength of the PET film layer and the first passivation layer; and finally, cooling to 20-35 ℃ at a cooling rate of 2 ℃/min to finish the coating of the PET film layer. The temperature operation curve of the invention is divided into four sections: the first-stage cooling, the second-stage cooling, the third-stage heating and the fourth-stage cooling are carried out, so that the PET film layer and the first passivation layer are perfectly combined together through the polymer bonding film layer. The adverse effect brought by immediate cooling in the prior art is avoided. The structure stability of the color PET wiredrawing film composite steel plate is enhanced, and the color PET wiredrawing film composite steel plate has no bubbles, full color and good glossiness.
The colorful coating plate adopts a galvanized plate base material, the upper surface and the lower surface of the galvanized plate base material are respectively provided with a first passivation layer and a second passivation layer, and the passivation layers are prepared by passivating a chromium-free passivation solution, so that the strength performance of the galvanized plate can be improved; the upper surface of first passivation layer sets up the PET rete, sets up the polymer bonding rete between first passivation layer and the PET rete, and the polymer bonding rete has strengthened the cohesion of PET rete and first passivation layer, has guaranteed the stability of clad steel plate.
The PET film layer comprises a PET color film layer, a PET wire drawing film layer and a PET bottom sealing film layer, the color diversity of the composite steel plate is guaranteed by the PET color film layer, the gloss of the composite steel plate is excellent, the composite steel plate is friction-resistant, the hardness and the toughness are high due to the PET wire drawing film layer, and the full color of the composite steel plate is further promoted by the PET bottom sealing film. In addition, the PE protective film layer is arranged on the upper surface of the PET film layer, and has good corrosion resistance and weather resistance and excellent cold and heat resistance.
The color-rich and heat-resistant composite material has the advantages of various colors, full color, good glossiness, stable and reliable quality, good aging resistance, heat and humidity resistance, acid resistance, alkali resistance and temperature difference resistance, no fading, no chalking, no environmental pollution and long service life, and can be kept for a long time, thereby meeting the requirements of modern development.
Drawings
FIG. 1 is a schematic structural diagram of a color PET wiredrawing film clad steel plate of the present invention;
FIG. 2 is a schematic structural view of a PET film layer;
in the figure: 1. a PE protective film layer; 2. a PET film layer; 3. a polymer adhesive film layer; 4. a first passivation layer; 5. a color coated sheet; 6. a second passivation layer; 7. an epoxy foaming back paint layer; 8. a PET wire drawing film layer; 9. a PET colored film layer; 10. PET back cover rete.
Detailed Description
The present invention is further described below with reference to examples.
Example 1
The preparation method of the color PET wiredrawing film composite steel plate comprises the following steps:
(1) pretreating a galvanized plate: adding degreasing alkaline liquor into a pre-degreasing tank and a main degreasing tank, cleaning stains on the front and back sides of a galvanized plate by using a brush roller, wherein the concentration of free alkali in the alkaline liquor in the degreasing tank is 8pt, the temperature in the degreasing tank is 55 ℃, pre-degreasing cleaning is finished, and a squeezing roller squeezes to dry and then enters main degreasing; the thickness of the galvanized plate is 6 mu m;
after the main degreasing and cleaning, cleaning the main degreasing and cleaning material for three times by pure water after squeezing the main degreasing and cleaning material by a squeezing roller, wherein the washing temperature is 55 ℃; after washing, blowing by hot air to enter a passivation process;
(2) the method comprises the steps of adopting a roller coating mode, coating the front surface of a galvanized plate by two groups of coating rollers, coating the back surface of the galvanized plate by the other group of coating rollers, coating the front surface and the back surface of the galvanized plate by a chromium-free passivation solution roller, controlling the concentration of the chromium-free passivation solution at 40 wt.%, and controlling the using amount to be 1.5g/m2Baking the galvanized plate at 230 ℃ to form a first passivation layer and a second passivation layer on the front side and the back side of the galvanized plate respectively, wherein the thicknesses of the first passivation layer and the second passivation layer are both 3 micrometers;
(3) a roll coating mode is adopted, a double-component polyurethane adhesive is firstly roll coated on the lower surface of a PET film layer, and a high-molecular adhesive film layer with the thickness of 4 mu m is formed after baking at 230 ℃ in an oven;
(4) attaching the PET film layer with the polymer bonding film layer on the upper surface of the first passivation layer through a heat-conducting film-coated steel roller, wherein during attaching, an oil-way heating system is arranged in the heat-conducting film-coated steel roller to enable the surface temperature of the PET film layer to reach 98 ℃, after attaching, spraying water, firstly cooling to 81 ℃ at a cooling rate of 3 ℃/min, and maintaining for 11min at 81 ℃; cooling to 61 deg.C at a cooling rate of 2 deg.C/min, and maintaining at 61 deg.C for 11 min; then heating to 71 ℃ at the heating rate of 1 ℃/min, and maintaining at 71 ℃ for 9 min; finally, cooling to 28 ℃ at a cooling rate of 2 ℃/min to finish the pasting; the PET film layer comprises an upper PET wire drawing film layer with the thickness of 2 mu m, a middle PET color film layer with the thickness of 4 mu m and a lower PET bottom sealing film layer with the thickness of 3 mu m;
(5) a PE protective film is pasted on the upper surface of the PET film layer at the temperature of 28 ℃, and the thickness is 3 mu m;
(6) coating the epoxy foaming back paint on the surface of the second passivation layer in a roller coating mode, and baking the epoxy foaming back paint at 230 ℃ in an oven to obtain an epoxy foaming back paint layer with the thickness of 5 mu m;
(7) and (3) spraying cold water on the galvanized plate coated with the epoxy foaming back paint layer for cooling, then inspecting according to actual requirements, and after the galvanized plate is detected to be qualified, winding the galvanized plate in a winding machine to obtain the colorful PET wiredrawing film composite steel plate.
Example 2
The preparation method of the color PET wiredrawing film composite steel plate comprises the following steps:
(1) pretreating a galvanized plate: adding degreasing alkaline liquor into a pre-degreasing tank and a main degreasing tank, cleaning stains on the front and back sides of a galvanized plate by using a brush roller, wherein the concentration of free alkali in the alkaline liquor in the degreasing tank is 5pt, the temperature in the degreasing tank is 70 ℃, pre-degreasing cleaning is finished, and a squeezing roller squeezes to dry and then enters main degreasing; the thickness of the galvanized plate is 5 mu m;
after the main degreasing and cleaning, cleaning the steel plate for three times by pure water after squeezing the steel plate by a squeezing roller, wherein the washing temperature is 70 ℃; after washing, blowing by hot air to enter a passivation process;
(2) the method comprises the steps of adopting a roller coating mode, coating the front surface of a galvanized plate by two groups of coating rollers, coating the back surface of the galvanized plate by the other group of coating rollers, coating the front surface and the back surface of the galvanized plate by a chromium-free passivation solution roller, controlling the concentration of the chromium-free passivation solution at 35 wt.%, and controlling the using amount to be 1.0g/m2Baking the galvanized plate at 220 ℃ to form a first passivation layer and a second passivation layer on the front side and the back side of the galvanized plate respectively, wherein the thicknesses of the first passivation layer and the second passivation layer are both 2 micrometers;
(3) a roll coating mode is adopted, a double-component polyurethane adhesive is firstly roll coated on the lower surface of a PET film layer, and a high-molecular adhesive film layer with the thickness of 2 mu m is formed after the PET film layer is baked in an oven at 220 ℃;
(4) attaching the PET film layer with the polymer bonding film layer on the upper surface of the first passivation layer through a heat-conducting film-coated steel roller, wherein during attaching, an oil-way heating system is arranged in the heat-conducting film-coated steel roller to enable the surface temperature of the PET film layer to reach 92 ℃, after attaching, spraying water, firstly cooling to 80 ℃ at a cooling rate of 3 ℃/min, and maintaining for 12min at 80 ℃; cooling to 60 deg.C at a cooling rate of 2 deg.C/min, and maintaining at 60 deg.C for 12 min; then heating to 70 ℃ at the heating rate of 1 ℃/min, and maintaining at 70 ℃ for 10 min; finally, cooling to 20 ℃ at a cooling rate of 2 ℃/min to finish the pasting; the PET film layer comprises an upper PET wire drawing film layer with the thickness of 2 mu m, a middle PET color film layer with the thickness of 5 mu m and a lower PET bottom sealing film layer with the thickness of 2 mu m;
(5) a PE protective film is pasted on the upper surface of the PET film layer at the temperature of 20 ℃, and the thickness is 2 mu m;
(6) coating the epoxy foaming back paint on the surface of the second passivation layer in a roller coating mode, and baking the epoxy foaming back paint at 220 ℃ in an oven to obtain an epoxy foaming back paint layer with the thickness of 3 mu m;
(7) and (3) spraying cold water on the galvanized plate coated with the epoxy foaming back paint layer for cooling, then inspecting according to actual requirements, and after the galvanized plate is detected to be qualified, winding the galvanized plate in a winding machine to obtain the colorful PET wiredrawing film composite steel plate.
Example 3
The preparation method of the color PET wiredrawing film composite steel plate comprises the following steps:
(1) pretreating a galvanized plate: adding degreasing alkaline liquor into a pre-degreasing tank and a main degreasing tank, cleaning stains on the front and back sides of a galvanized plate by using a brush roller, wherein the concentration of free alkali in the alkaline liquor in the degreasing tank is 12pt, the temperature in the degreasing tank is 45 ℃, pre-degreasing cleaning is finished, and a squeezing roller squeezes to dry and then enters main degreasing; the thickness of the galvanized plate is 8 mu m;
after the main degreasing and cleaning, cleaning the main degreasing and cleaning the; after washing, blowing by hot air to enter a passivation process;
(2) the method comprises the steps of adopting a roller coating mode, coating the front surface of a galvanized plate by two groups of coating rollers, coating the back surface of the galvanized plate by the other group of coating rollers, coating the front surface and the back surface of the galvanized plate by a chromium-free passivation solution roller, controlling the concentration of the chromium-free passivation solution at 50 wt.%, and controlling the using amount to be 2.0g/m2Baking the galvanized plate at 240 ℃, and respectively forming a first passivation layer and a second passivation layer on the front side and the back side of the galvanized plate, wherein the thicknesses of the first passivation layer and the second passivation layer are both 4 micrometers;
(3) a roll coating mode is adopted, a double-component polyurethane adhesive is firstly roll coated on the lower surface of a PET film layer, and a high-molecular adhesive film layer with the thickness of 5 mu m is formed after baking at 240 ℃ in an oven;
(4) attaching the PET film layer with the polymer bonding film layer on the upper surface of the first passivation layer through a heat-conducting film-coated steel roller, wherein during attaching, an oil-way heating system is arranged in the heat-conducting film-coated steel roller to enable the surface temperature of the PET film layer to reach 105 ℃, after attaching, spraying water, firstly cooling to 82 ℃ at a cooling rate of 3 ℃/min, and maintaining for 10min at 82 ℃; cooling to 62 deg.C at a cooling rate of 2 deg.C/min, and maintaining at 62 deg.C for 10 min; then heating to 72 ℃ at the heating rate of 1 ℃/min, and maintaining at 72 ℃ for 8 min; finally, cooling to 35 ℃ at a cooling rate of 2 ℃/min to finish the pasting; the PET film layer comprises an upper PET wire drawing film layer with the thickness of 3 mu m, a middle PET color film layer with the thickness of 4 mu m and a lower PET bottom sealing film layer with the thickness of 3 mu m;
(5) a PE protective film is pasted on the upper surface of the PET film layer at 35 ℃ and the thickness is 8 mu m;
(6) coating the epoxy foaming back paint on the surface of the second passivation layer in a roller coating mode, and baking the epoxy foaming back paint in an oven at 240 ℃ to obtain an epoxy foaming back paint layer with the thickness of 6 microns;
(7) and (3) spraying cold water on the galvanized plate coated with the epoxy foaming back paint layer for cooling, then inspecting according to actual requirements, and after the galvanized plate is detected to be qualified, winding the galvanized plate in a winding machine to obtain the colorful PET wiredrawing film composite steel plate.
Comparative example 1
And (4) pasting the PET film layer with the polymer bonding film layer on the upper surface of the first passivation layer through the heat-conducting film-covering steel roller, wherein during pasting, the heat-conducting film-covering steel roller is internally provided with an oil way heating system to enable the surface temperature of the PET film layer to reach 98 ℃. After the coating, spraying water again, and directly cooling the temperature from 98 ℃ to 28 ℃ to finish the coating; the rest of the procedure was the same as in example 1.
Comparative example 2
And (4) pasting the PET film layer with the polymer bonding film layer on the upper surface of the first passivation layer through the heat-conducting film-covering steel roller, wherein during pasting, the heat-conducting film-covering steel roller is internally provided with an oil way heating system to enable the surface temperature of the PET film layer to reach 98 ℃. After coating, spraying water, directly cooling from 98 ℃ to 61 ℃, and maintaining at 61 ℃ for 11 min; then cooling from 61 ℃ to 28 ℃ to finish the pasting; the rest of the procedure was the same as in example 1.
Comparative example 3
And (4) pasting the PET film layer with the polymer bonding film layer on the upper surface of the first passivation layer through the heat-conducting film-covering steel roller, wherein during pasting, the heat-conducting film-covering steel roller is internally provided with an oil way heating system to enable the surface temperature of the PET film layer to reach 98 ℃. After coating, spraying water, directly cooling from 98 ℃ to 61 ℃, and maintaining at 61 ℃ for 11 min; then heating to 71 ℃ at the heating rate of 1 ℃/min, and maintaining at 71 ℃ for 9 min; finally, cooling to 28 ℃ at a cooling rate of 2 ℃/min to finish the pasting; the rest of the procedure was the same as in example 1.
Comparative example 4
And (4) pasting the PET film layer with the polymer bonding film layer on the upper surface of the first passivation layer through the heat-conducting film-covering steel roller, wherein during pasting, the heat-conducting film-covering steel roller is internally provided with an oil way heating system to enable the surface temperature of the PET film layer to reach 98 ℃. After the coating, spraying water, cooling to 81 ℃ at a cooling rate of 3 ℃/min, and maintaining for 11min at 81 ℃; cooling to 61 deg.C at a cooling rate of 2 deg.C/min, and maintaining at 61 deg.C for 11 min; then cooling to 28 ℃ at a cooling rate of 2 ℃/min to finish the pasting; the rest of the procedure was the same as in example 1.
The colored PET drawn film clad steel sheets obtained in examples 1 to 3 and comparative examples 1 to 4 were subjected to performance tests, and the test data are shown in table 1.
Table 1 table of performance test data
Yield strength/MPa Tensile strength/MPa Elongation/percent
Example 1 435 460 33.1
Example 2 428 455 32.8
Example 3 431 458 32.5
Comparative example 1 315 325 25.1
Comparative example 2 321 334 24.7
Comparative example 3 329 341 23.1
Comparative example 4 333 345 22.9
As can be seen from the data in Table 1, the yield strength, tensile strength and elongation of the color PET wiredrawing film composite steel plate are improved by adopting temperature operation curve cooling, and the structural stability of the color PET wiredrawing film composite steel plate is enhanced.
The color PET wiredrawing film composite steel plate comprises a color coating plate 5, wherein a first passivation layer 4 and a second passivation layer 6 are respectively arranged on the upper surface and the lower surface of the color coating plate 5, as shown in figures 1-2; the upper surface of the first passivation layer 4 is sequentially provided with a polymer bonding film layer 3, a PET film layer 2 and a PE protective film layer 1 from bottom to top;
the PET film layer 2 comprises a PET color film layer 9, a PET wiredrawing film layer 8 arranged on the upper surface of the PET color film layer 9 and a PET back cover film layer 10 arranged on the lower surface of the PET color film layer 9; the upper surface of the PET wire drawing film layer 8 is connected with the PE protective film layer 1, and the lower surface of the PET back cover film layer 10 is connected with the polymer bonding film layer 3;
and an epoxy foaming back paint layer 7 is arranged on the lower surface of the second passivation layer 6.
The color coating plate 5 is a galvanized plate.
The color coating plate 5 adopts a galvanized plate base material, the upper surface and the lower surface of the color coating plate 5 are respectively provided with a first passivation layer 4 and a second passivation layer 6, and the passivation layers are prepared by passivating a chromium-free passivation solution, so that the strength performance of the galvanized plate can be improved; the upper surface of first passivation layer 4 sets up PET rete 2, sets up polymer bonding rete 3 between first passivation layer 4 and the PET rete 2, and polymer bonding rete 3 has strengthened PET rete 2 and first passivation layer 4's cohesion, has guaranteed the stability of clad steel plate.
The PET film layer 2 comprises a PET color film layer 9, a PET wiredrawing film layer 8 and a PET bottom sealing film layer 10, the color diversity of the composite steel plate is guaranteed by the PET color film layer 9, the gloss of the composite steel plate is excellent and the composite steel plate is friction-resistant due to the PET wiredrawing film layer 8, the hardness and the toughness are high, and the full color of the composite steel plate is further promoted by the PET bottom sealing film layer 10. In addition, the PE protective film layer 1 is arranged on the surface of the PET film layer 2, and the PE protective film layer 1 has good corrosion resistance and weather resistance and excellent cold and heat resistance.

Claims (10)

1. A preparation method of a color PET wiredrawing film composite steel plate comprises the steps of forming a first passivation layer and a second passivation layer on a color coating plate, and attaching a PET film layer on the first passivation layer, and is characterized in that: the steps of coating the PET film layer are as follows: firstly, attaching a polymer bonding film layer to the lower surface of a PET film layer, then attaching the PET film layer with the polymer bonding film layer to the upper surface of a first passivation layer, wherein during attaching, a heat-conducting film-covering steel roller enables the temperature of the PET film layer to reach 92-105 ℃, and after attaching, cooling to 20-35 ℃ according to a temperature operation curve to finish attaching;
the temperature operation curve is that the temperature is firstly reduced to 80-82 ℃ at the cooling rate of 3 ℃/min, and is maintained at 80-82 ℃ for 10-12 min; cooling to 60-62 deg.C at a cooling rate of 2 deg.C/min, and maintaining at 60-62 deg.C for 10-12 min; then heating to 70-72 ℃ at a heating rate of 1 ℃/min, and maintaining at 70-72 ℃ for 8-10 min; finally, the temperature is reduced to 20-35 ℃ at the cooling rate of 2 ℃/min.
2. The method for preparing the color PET wiredrawing film composite steel plate according to claim 1, characterized in that: the method comprises the following steps:
(1) the method comprises the steps of coating chromium-free passivation solution on the front side and the back side of a galvanized plate in a roller coating mode, and then baking the galvanized plate to form a first passivation layer and a second passivation layer on the front side and the back side of the galvanized plate respectively;
(2) firstly, coating a double-component polyurethane adhesive on the lower surface of a PET film layer in a roller manner to form a high-molecular adhesive film layer, then pasting the PET film layer with the high-molecular adhesive film layer on the upper surface of a first passivation layer through a heat-conducting film-coated steel roller, wherein during pasting, the heat-conducting film-coated steel roller is internally provided with an oil way heating system to enable the surface temperature of the PET film layer to reach 92-105 ℃, and after pasting, cooling to 20-35 ℃ according to a temperature operation curve to finish pasting;
(3) a PE protective film layer is pasted on the upper surface of the PET film layer at the temperature of 20-35 ℃;
(4) coating the epoxy foaming back paint on the surface of the second passivation layer in a roller coating mode, and baking to obtain an epoxy foaming back paint layer;
(5) and spraying cold water on the galvanized sheet coated with the epoxy foaming back paint layer, cooling, and winding in a winding machine to obtain the colorful PET wiredrawing film composite steel plate.
3. The method for preparing the color PET wiredrawing film composite steel plate according to claim 2, characterized in that: in the step (1), the concentration of the chromium-free passivation solution is 30-55 wt.%, and the using amount is 0.7-2.0g/m2(ii) a The baking temperature is 220-240 ℃.
4. The method for preparing the color PET wiredrawing film composite steel plate according to claim 2, characterized in that: in the step (1), the thickness of the galvanized plate is 4-8 μm, the thicknesses of the first passivation layer and the second passivation layer are both 2-4 μm, and the thicknesses of the first passivation layer and the second passivation layer are the same.
5. The method for preparing the color PET wiredrawing film composite steel plate according to claim 2, characterized in that: in the step (1), the galvanized sheet is pretreated and then is coated with a chromium-free passivation solution in a roller coating mode, and the pretreatment step is that the galvanized sheet is subjected to pre-degreasing, main degreasing and three-time water washing, and then is subjected to hot air blowing to enter a passivation process.
6. The method for preparing the color PET wiredrawing film composite steel plate according to claim 5, characterized in that: adding degreasing alkali liquor during pre-degreasing and main degreasing, cleaning stains on the front and back sides of the galvanized plate by using a brush roller, wherein the temperature in a degreasing tank is 40-70 ℃, pre-degreasing and cleaning are finished, and a water squeezing roller squeezes to dry and then enters main degreasing;
after the main degreasing and cleaning, the water squeezing roller is used for squeezing and then washing, and the three times of washing are pure water washing, wherein the washing temperature is 40-70 ℃.
7. The method for preparing a color PET drawn film clad steel sheet according to claim 1 or 2, wherein: the PET film layer comprises an upper PET wire drawing film layer, a middle PET color film layer and a lower PET back cover film layer.
8. The method for preparing the color PET wiredrawing film composite steel plate according to claim 7, characterized in that: the thickness of the PET colored film layer is 3-5 mu m, the thickness of the PET wiredrawing film layer is 2-3 mu m, and the thickness of the PET back cover film layer is 2-3 mu m.
9. The method for preparing a color PET drawn film clad steel sheet according to claim 1 or 2, wherein: the thickness of the high molecular adhesive film layer is 2-5 μm.
10. The method for preparing the color PET wiredrawing film composite steel plate according to claim 2, characterized in that: the thickness of the PE protective film is 0.04-10 mu m, and the thickness of the epoxy foaming back paint layer is 3-6 mu m.
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CN113524701A (en) * 2021-06-17 2021-10-22 杭州普络飞新材料科技有限公司 Solvent-free steel plate film coating process

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