CN115304988B - Environment-friendly primer, environment-friendly primer color-coated plate and production method thereof - Google Patents
Environment-friendly primer, environment-friendly primer color-coated plate and production method thereof Download PDFInfo
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- CN115304988B CN115304988B CN202210976599.7A CN202210976599A CN115304988B CN 115304988 B CN115304988 B CN 115304988B CN 202210976599 A CN202210976599 A CN 202210976599A CN 115304988 B CN115304988 B CN 115304988B
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
- C09D5/082—Anti-corrosive paints characterised by the anti-corrosive pigment
- C09D5/084—Inorganic compounds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
- C09D5/082—Anti-corrosive paints characterised by the anti-corrosive pigment
- C09D5/086—Organic or non-macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/02—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using non-aqueous solutions
- C23C22/04—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using non-aqueous solutions containing hexavalent chromium compounds
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G5/00—Cleaning or de-greasing metallic material by other methods; Apparatus for cleaning or de-greasing metallic material with organic solvents
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/32—Phosphorus-containing compounds
- C08K2003/321—Phosphates
- C08K2003/327—Aluminium phosphate
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Abstract
The invention discloses an environment-friendly primer, an environment-friendly primer color-coated plate and a production method thereof, wherein the environment-friendly primer comprises the following raw materials in percentage by weight: 40% -65% of polyurethane resin, 10% -20% of composite tungstate, 2% -8% of fumed silica, 1.0% -2.0% of wetting agent, 0.5% -1.5% of defoaming agent and the balance of solvent; the raw materials of the composite tungstate comprise tungstate, aluminum tripolyphosphate and organic nitro zinc; the environment-friendly primer color-coated plate is prepared from environment-friendly raw materials, is environment-friendly and nontoxic, meets the environmental protection limit of GB/T30981-2020, has excellent performances, and meets the requirements of cost, performance, environment protection and the like.
Description
Technical Field
The invention belongs to the technical field of color-coated steel plates, and particularly relates to an environment-friendly primer and an environment-friendly primer color-coated plate and a production method thereof.
Background
The traditional paint contains a large amount of pollutants, and organic volatile matters and various heavy metal ions contained in the traditional paint can cause great harm to the health of people. The anticorrosive pigments in the coiled material primer with wide application are red lead, chrome yellow, strontium chrome yellow, barium chrome yellow, calcium chrome yellow and the like, and the anticorrosive pigments have excellent antirust property and low cost, but the composition contains toxic metal lead, chromium and the like, so the application prospect of the product is limited.
With the government continuing to advance the strategic goals of "carbon peak, carbon neutralization," environmental protection, energy conservation, and green health are becoming the strategic direction of development in various fields. The EU prohibits the use of hexavalent chromium-containing products by manufacturing industries within the EU after 22 days of 1 month in 2019, and the products containing heavy metal chromium and the like gradually exit the application stage of coil coating along with the mandatory implementation of the standard of GB/T30981-2020 Industrial protective coating Limit of harmful substances in 2022, 1 month and 1 day in China. To accommodate the promulgating implementation of this standard, the product attributes of steelworks and the upstream and downstream related industries must shift from high pollution to high technical added value, high performance and high functionality, low pollution and low emissions. Therefore, development of rust-preventive pigments and substitutes for heavy metals such as lead and chromium is imperative.
Meanwhile, european Union environmental Specification 1999/45/EC states: if the amount of zinc compound (e.g., zinc oxide, zinc phosphate, etc.) in the coating exceeds a specified amount, it must be marked in the packaging container, thereby limiting the use of zinc phosphate and its derivatives.
Products in the current rust-proof market are mainly products meeting single performance requirements, and if single rust-proof pigment is used in many cases, the comprehensive performance requirements are hardly met, and the rust-proof effect is limited. The corrosion resistance of the traditional environment-friendly primer coating building color-coated plate can not reach the corrosion resistance of a chromium primer coating system.
Disclosure of Invention
The invention aims to provide an environment-friendly primer which adopts environment-friendly raw materials, is environment-friendly and nontoxic and meets the environment-friendly limit of GB/T30981-2020.
The invention also aims to provide an environment-friendly primer color-coated plate and a production method thereof, which have excellent performances and meet the requirements of cost, performance, environment protection and the like.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
an environment-friendly primer, which comprises the following raw materials in percentage by weight: 40% -65% of polyurethane resin, 10% -20% of composite tungstate, 2% -8% of fumed silica, 1.0% -2.0% of wetting agent, 0.5% -1.5% of defoaming agent and the balance of solvent; the raw materials of the composite tungstate comprise tungstate, aluminum tripolyphosphate and sodium zinc ethylenediamine tetraacetate.
The viscosity of the environment-friendly primer is 40-50s.
The raw materials of the composite tungstate also comprise bentonite and talcum powder.
In the composite tungstate, the weight ratio of the raw materials is tungstate: aluminum tripolyphosphate: zinc sodium ethylenediamine tetraacetate=10-8: 1-1.2:1.
in the composite tungstate, the weight ratio of the raw materials is tungstate: aluminum tripolyphosphate: zinc sodium ethylenediamine tetraacetate: bentonite: talc = 10-8:1-1.2:1:0.1:0.1.
the tungstate is Zn (WO 4 ) 2 、Mn(WO 4 ) 2 、NaFe(WO 4 ) 2 ) Any one or more of the following.
The model of the polyurethane resin is DJ-216-98601.
The wetting agent is any one or more of TEGO4100, TEGO510 and TEGO 245.
The defoaming agent is organic silicon defoaming agent Foamic-042 or ether defoaming agent GP-330.
The solvent in the environment-friendly primer is one or more of isopropyl benzene, isopropyl alcohol and methyl isopropyl ether.
The invention also provides a production method of the environment-friendly primer color-coated plate, which comprises the following steps: degreasing pretreatment, passivation, coating of the environment-friendly primer and coating of the front and back surface paint.
In the degreasing pretreatment step, the degreasing temperature is controlled to be 45+/-5 ℃ and the pH value is controlled to be 10-12.
In the passivation step, the strip steel subjected to degreasing pretreatment enters a chemical coating machine to be coated with passivation solution for passivation, and enters a curing furnace at 120 ℃ for curing for 5 seconds after exiting the chemical coating machine, and the strip steel is cooled to below 35 ℃ after being dried by cold air.
In the passivation step, the passivation solution comprises the following raw materials in percentage by weight: 40-50% of chromate, 5-15% of sulfate, 2-5% of amino silicone oil, 20-30% of nitrate and the balance of solvent, wherein the content of Cr in the passivated film is 20-40mg/m 2 Si content is 5-10mg/m 2 . The passivation effect is mainly achieved by forming crosslinking between a base material and a coating and simultaneously increasing corrosion resistance, and in the passivation layer formed by the passivation solution, when amino silicone oil reacts with a primer, terminal Si element is dissociated on the surface of the passivation layer, and a random network structure which uniformly combines interpenetrating multi-layer oxide films is formed between the terminal Si element and resin in the primer at an interface; at the same time, the passivation film layer is close to the inside of the base material and is negatively charged with SiO 3 2- Ion, i.e. SiO 2 The micelle and positively charged metal ions are coordinated to form a protective film, and in addition, the addition of the zirconium salt can not only reduce the porosity and the conductivity of the passivation film, but also increase the thickness of the passivation film layer and the corrosion resistance of the passivation film layer, thereby increasing the overall corrosion resistance of the chromium-free system color-coated plate.
The chromate is one or two of sodium chromate and potassium chromate.
The sulfate is one or two of zinc sulfate and sodium sulfate.
The nitrate is any one or more of ammonium nitrate, zirconium nitrate and magnesium nitrate.
The solvent in the passivation solution is one or two of propylene glycol and diethyl ether.
And (3) coating the environment-friendly primer on the surface of the strip steel in a continuous two-roller reverse coating mode, then entering a vertical curing furnace for drying, wherein the curing temperature is 210-240 ℃, and entering a water quenching tank after the strip steel is discharged from the curing furnace for drying by supercooling wind. The temperature of the coating was 35.+ -. 5 ℃.
Environment-friendly primer coating thickness H d ＝W Coating roller and lifting roller +(V Coating roller +V Material lifting roller )/100+㏒ 10 V Production line The method comprises the steps of carrying out a first treatment on the surface of the Wherein W is Coating roller and lifting roller For the gap between the coating roller and the lifting roller, V Coating roller For coating roller speed, V Material lifting roller For the lifting roller speed, V Production line The running speed of the strip steel is; w (W) Coating roller and lifting roller 1.5-2.5mm; v (V) Coating roller 100-150m/min; v (V) Material lifting roller 40-80m/min; v (V) Production line 60-120m/min.
In the step of coating the front and back paint, the steel strip coated with the environment-friendly primer enters a roller coating chamber through a steering roller to finish the finish paint, the temperature is 35+/-5 ℃, the paint viscosity is 55-65s, and the thickness of the coating is 25+/-2 mu m.
In the step of coating the front and back paint, a continuous three-roller reverse coating mode is adopted to coat the top paint on the surface of the strip steel, then the strip steel enters a vertical curing furnace for drying, the curing temperature is 230-260 ℃, and the strip steel enters a water quenching tank after exiting the curing furnace and is dried by cold air.
The model of the finishing paint is DJ-219-88028 silver gray, which is produced by Bevaceae industry paint (Shanghai) Limited.
The step of coating the front and back paint further comprises the following steps: the strip steel passes through an inspection table and an outlet shear, the strip steel is cut into small rolls required, and then a coil stripping trolley is used for transporting the finished product to an outlet steel coil seat, so that the environment-friendly primer building color-coated plate is obtained.
In the formula of the environment-friendly primer, the fumed silica has the advantages of large specific surface area, strong surface adsorption force, large surface energy, high chemical purity and good dispersion property because of small particle size, and the fumed silica and the passivation layer are crosslinked into a reticular structure, so that the overall adhesive force and corrosion resistance are improved; the composite tungstate is compounded by aluminum tripolyphosphate and sodium zinc ethylenediamine tetraacetate, so that the bonding compound of P-Zn-OH generated after the aluminum tripolyphosphate reacts with a film forming material or moisture is of a sheet structure, the metal substrate can be shielded and corroded, the defect that the traditional tungstate is slow in forming a protective film is overcome, and in addition, the sodium zinc ethylenediamine tetraacetate is stronger than the tungstate in water solubility, so that the defect that the tungstate is weak in initial corrosion resistance and too slow in forming an effective protective film is overcome.
According to the invention, through the matched use of all raw materials in the environment-friendly primer, the salt spray resistance is doubled relative to that of a single pigment, the compound tungstate and the fumed silica can seal microcracks and gaps formed after the coating is solidified, so that the permeation of corrosive medium is more difficult, a good barrier effect is generated, for example, tungstate ions in the tungstate in the compound tungstate are attached to the surface of metal to generate a layer of protective film, so that the surface of the metal is passivated, thus the permeability and corrosion resistance of the coating are enhanced, the permeation of corrosive factors such as water, oxygen and ions is effectively shielded, capillary holes in the coating are cut off, the deep way of the corrosive medium is enhanced and blocked or prolonged, the corrosion resistance of the coating is improved, tungstate ions can also act with dissolved ferrous salt in the coating, and the anode protection is realized by forming the protective film composed of a complex compound, so that the corrosion resistance of the coating is greatly improved. In addition, from the viewpoint of cost, bentonite and superfine talcum powder are properly added into the formula of the environment-friendly primer, and the addition of the bentonite and the superfine talcum powder can improve the solid content of the environment-friendly primer.
Compared with the prior art, the invention has the following advantages:
1. the environment-friendly primer provided by the invention adopts the composite tungstate as the anti-corrosion pigment, overcomes the defect of slow rate of forming a protective film by the traditional tungstate anti-corrosion pigment, meets the environment-friendly limit of GB/T30981-2020, improves the corrosion resistance of the coating by the cooperation of the raw materials, controls the on-site key process, has the corrosion resistance equivalent to that of the chromium primer under the same test condition, and even has better adhesive force;
2. the complex tungstate in the environment-friendly primer formula provided by the invention can be used for blocking microcracks and gaps formed after the coating is cured under the synergistic effect of the complex tungstate and the fumed silica, so that the penetration of corrosive medium is more difficult, and a good blocking effect is generated;
3. the invention is produced on an industrial production line, and environment-friendly primer color-coated plates with all performances meeting the requirements can be produced in batches and stably according to the parameters of the model.
Detailed Description
The invention provides an environment-friendly primer, which comprises the following raw materials in percentage by weight: 40% -65% of polyurethane resin, 10% -20% of composite tungstate, 2% -8% of fumed silica, 1.0% -2.0% of wetting agent, 0.5% -1.5% of defoaming agent and the balance of solvent;
wherein, the raw materials of the composite tungstate comprise tungstate, aluminum tripolyphosphate and organic zinc nitrate, and the weight ratio of the raw materials is tungstate: aluminum tripolyphosphate: zinc sodium ethylenediamine tetraacetate=10-8: 1-1.2:1.
the raw materials of the composite tungstate also comprise bentonite and talcum powder, and the weight ratio of the raw materials is tungstate: aluminum tripolyphosphate: zinc sodium ethylenediamine tetraacetate: bentonite: talc = 10-8:1-1.2:1:0.1:0.1.
tungstate is Zn (WO) 4 ) 2 、Mn(WO 4 ) 2 、NaFe(WO 4 ) 2 ) Any one or more of
The model of the polyurethane resin is DJ-216-98601.
The wetting agent is any one or more of TEGO4100, TEGO510 and TEGO 245.
The defoaming agent is organosilicon defoaming agent Foamic-042 or ether defoaming agent GP-330.
The solvent is one or more of isopropyl benzene, isopropanol and methyl isopropyl ether.
The invention provides a production method of an environment-friendly primer color-coated plate, which comprises the following steps: degreasing pretreatment, passivation, coating of the environment-friendly primer and coating of the front and back surface paint.
Wherein, in the degreasing pretreatment step, the degreasing temperature is controlled to be 45+/-5 ℃ and the pH is controlled to be 10-12.
In the passivation step, the strip steel subjected to degreasing pretreatment enters a chemical coating machine to be coated with passivation solution for passivation, and enters a 120 ℃ curing furnace to be cured for 5s after exiting the chemical coating machine, and the strip steel is cooled to below 35 ℃ after being dried by cold air.
In the passivation step, the passivation solution comprises the following raw materials in percentage by weight: 40-50% of chromate, 5-15% of sulfate, 2-5% of amino silicone oil, 20-30% of nitrate, and the balance of solvent, and dullnessThe Cr content in the film after conversion is 20-40mg/m 2 Si content is 5-10mg/m 2 . Wherein the chromate, sulfate, nitrate and solvent are sodium chromate, zinc sulfate, zirconium nitrate and propylene glycol respectively.
In the step of coating the environment-friendly primer, the environment-friendly primer is coated on the surface of the strip steel by adopting a continuous two-roller back coating mode, then the strip steel enters a vertical curing furnace for drying, the curing temperature is 210-240 ℃, and the strip steel enters a water quenching tank after exiting the curing furnace for drying by supercooling wind. The temperature of the coating was 35.+ -. 5 ℃.
Environment-friendly primer coating thickness H d ＝W Coating roller and lifting roller +(V Coating roller +V Material lifting roller )/100+㏒ 10 V Production line The method comprises the steps of carrying out a first treatment on the surface of the Wherein W is Coating roller and lifting roller For the gap between the coating roller and the lifting roller, V Coating roller For coating roller speed, V Material lifting roller For the lifting roller speed, V Production line The running speed of the strip steel is; w (W) Coating roller and lifting roller 1.5-2.5mm; v (V) Coating roller 100-150m/min; v (V) Material lifting roller 40-80m/min; v (V) Production line 60-120m/min.
In the step of coating the front and back paint, the steel strip coated with the environment-friendly primer enters a roller coating chamber through a steering roller to finish coating, the temperature is 35+/-5 ℃, the paint viscosity is 55-65s, and the thickness of the coating is 25+/-2 mu m.
In the step of coating the front and back paint, a continuous three-roller reverse coating mode is adopted to coat the top paint on the surface of the strip steel, then the strip steel enters a vertical curing furnace for drying, the curing temperature is 230-260 ℃, and the strip steel enters a water quenching tank after exiting the curing furnace and is dried by cold air.
The model of the top coat is DJ-219-88028 silver gray, produced by Becko Industrial coatings (Shanghai) Inc.
The step of coating the front and back paint further comprises the following steps: the strip steel passes through an inspection table and an outlet shear, the strip steel is cut into small rolls required, and then a coil stripping trolley is used for transporting the finished product to an outlet steel coil seat, so that the environment-friendly primer building color-coated plate is obtained.
The present invention will be described in detail with reference to examples.
The thickness of the substrate in the examples and comparative examples was 0.5mm, the brand was TDCD51D+AZ, and the double-sided weight of the plating was 150g/m 2 . The primer formulation and process are shown in tables 2 and 3. The top coat paint was DJ-219-88028 silver gray, produced by Becky Industrial paint (Shanghai) Inc.
The sources of the respective raw materials in each example and comparative example are shown in table 1.
Table 1 names of medicines and manufacturers in examples and comparative examples
| Medicament name | Manufacturer (S) |
| Polyurethane DJ216-98601 | Bei Kegong paint Co Ltd |
| Wetting agent TEGO4100 | German Digao |
| Defoaming agent GP-330 | Ara Ding Shiji |
| Zinc ethylenediamine tetraacetic acid sodium salt | Ara Ding Shiji |
The passivation solution, primer raw material composition and weight percent and key process parameters in examples 1-3 and comparative examples 1-4 are shown in tables 2, 3.
Table 2 examples and comparative examples passivation layer, rust inhibitive pigment in primer, and critical process control
The weight parts of the respective raw materials in the complex tungstate in table 2 are shown in table 3.
TABLE 3 Table 3
Compared with the comparative example 1, the traditional antirust pigment is used, is not environment-friendly and does not accord with national policy and regulations; comparative example 2, which is the same as example 2 except that no amino silicone oil was added, demonstrates the assistance of amino silicone oil to the improvement of corrosion resistance; compared with the comparative example 3, the corrosion resistance and the acid-base resistance of the coating are poor without adding the fumed silica, which indicates that the fumed silica is important for improving the compactness of the coating; comparative example 4, which is the same in process parameters as example 2, does not determine the coating thickness of the primer according to the formula for the primer, and has inferior properties to example 2, illustrating that determining the coating thickness of the primer according to the formula determined in the present invention is a key factor for ensuring the coating properties.
In summary, passivation, rust inhibitive pigments for primers, and in-line processes organically combine to form the content of this patent.
Performance testing
The color coated steel sheets manufactured by the methods of example 1/2/3 and comparative example 1/2/3/4 were subjected to performance tests, and the properties of the panels are shown in tables 4 and 5.
TABLE 4 color coated sheet conventional Properties
| Sequence number | Primer film thickness | Chromatic aberration | Gloss of the product | T-bend | Impact | Hardness of pencil | MEK |
| Example 1 | 5.38 | 0.55 | 32 | ≤2T | ≥9J | ≥F | ≥100 |
| Example 2 | 6.18 | 0.51 | 35 | ≤2T | ≥9J | ≥F | ≥100 |
| Example 3 | 5.75 | 0.44 | 39 | ≤2T | ≥9J | ≥F | ≥100 |
| Comparative example 1 | 5.38 | 0.50 | 36 | ≤2T | ≥9J | ≥F | ≥100 |
| Comparative example 2 | 6.18 | 0.46 | 31 | ≤3T | ≥9J | ≥F | ≥100 |
| Comparative example 3 | 5.75 | 0.41 | 28 | ≤4T | ≥5J | ≥F | ≥100 |
| Comparative example 4 | 6.58 | 0.36 | 36 | ≤2T | ≥5J | ≥F | ≥100 |
| Comparative example 5 | 6.38 | 0.52 | 33 | ≤3T | ≥9J | ≥F | ≥100 |
TABLE 5 color coated sheet unconventional Properties
The ROHS detection report for the color coated sheet in example 1 is shown in table 6.
TABLE 6
The foregoing detailed description of an environmental protection primer and environmental protection primer color coated sheet and method of producing the same, with reference to the examples, is illustrative and not limiting, and several examples can be listed according to the scope defined thereby, and therefore, variations and modifications without departing from the general inventive concept shall fall within the scope of protection of the present invention.
Claims (5)
1. The production method of the environment-friendly primer color-coated plate is characterized by comprising the following steps of: degreasing pretreatment, passivation, environmental protection primer coating and front and back surface paint coating;
the environment-friendly primer comprises the following raw materials in percentage by weight:
40% -65% of polyurethane resin, 10% -20% of composite tungstate, 2% -8% of fumed silica, 1.0% -2.0% of wetting agent, 0.5% -1.5% of defoaming agent and the balance of solvent; the raw materials of the composite tungstate comprise tungstate, aluminum tripolyphosphate and sodium zinc ethylenediamine tetraacetate; in the composite tungstate, the weight ratio of the raw materials is tungstate: aluminum tripolyphosphate: zinc sodium ethylenediamine tetraacetate=10-8: 1-1.2:1, a step of;
coating the environment-friendly primer on the surface of the strip steel in a continuous two-roller reverse coating mode, then entering a vertical curing furnace for drying, wherein the curing temperature is 210-240 ℃, and entering a water quenching tank after the strip steel is discharged from the curing furnace for drying by supercooling wind; the coating temperature is 35+/-5 ℃; coating thickness H of the environment-friendly primer d =W Coating roller and lifting roller +（V Coating roller +V Material lifting roller ）/100+㏒ 10 V Production line The method comprises the steps of carrying out a first treatment on the surface of the Wherein W is Coating roller and lifting roller For the gap between the coating roller and the lifting roller, V Coating roller For coating roller speed, V Material lifting roller For the lifting roller speed, V Production line The running speed of the strip steel is; w (W) Coating roller and lifting roller 1.5-2.5mm; v (V) Coating roller 100-150m/min; v (V) Material lifting roller 40-80m/min; v (V) Production line 60-120 m/min;
in the passivation step, the passivation solution comprises the following raw materials in percentage by weight: 40-50% of chromate, 5-15% of sulfate, 2-5% of amino silicone oil, 20-30% of nitrate and the balance of solvent, wherein the content of Cr in the passivated film is 20-40mg/m 2 Si content is 5-10mg/m 2 。
2. The method of claim 1, wherein the starting material for the complex tungstate further comprises bentonite and talc.
3. The production method according to claim 2, wherein in the composite tungstate, the weight ratio of each raw material is tungstate: aluminum tripolyphosphate: zinc sodium ethylenediamine tetraacetate: bentonite: talc = 10-8:1-1.2:1:0.1:0.1.
4. a production method according to any one of claims 1 to 3, wherein the tungstate is Zn (WO 4 ) 2 、Mn(WO 4 ) 2 、NaFe(WO 4 ) 2 Any one or more of the following.
5. The environmentally friendly primer color coated sheet produced by the production method according to any one of claims 1 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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