Wave-shaped guardrail plastic layer-water paint composite anti-corrosion technology and wave-shaped guardrail

Abstract

The invention relates to the technical field of corrugated guardrail processing, and particularly discloses a corrugated guardrail plastic layer-water paint composite anti-corrosion process and a corrugated guardrail, and the corrugated guardrail plastic layer-water paint composite anti-corrosion process comprises the steps of pretreatment, cleaning fluid cleaning, two-stage water washing, film treatment, drying, plastic spraying curing, paint spraying curing, cooling, inspection packaging and the like. A neutral environment-friendly cleaning solution, a chromium-free zirconium coating agent, an environment-friendly powder coating and water-based paint are adopted to form a three-layer structure of a coating conversion layer, a first anti-corrosion plastic layer and a second anti-corrosion paint layer. The process steps are normative, all the used materials meet the environmental protection standard, the energy consumption is low, the binding force of the guardrail coating and the base material can be effectively improved, the anti-corrosion performance is enhanced, and the service life is prolonged; meanwhile, the environment-friendly energy-saving wave-shaped guardrail is reasonable in structure and excellent in corrosion resistance and durability, and meets the use requirements of road traffic safety facilities.

Description

Technical Field

[0001] This invention relates to the field of corrugated guardrail processing technology, specifically to a corrugated guardrail plastic layer-water-based paint composite anti-corrosion process and a corrugated guardrail. Background Technology

[0002] Corrugated guardrails, as a core component of road traffic safety facilities, are widely used in highways, urban and rural roads, bridges, and other scenarios. Their main function is to absorb the energy of vehicle collisions and guide vehicle travel, thereby reducing personal injury and property damage caused by traffic accidents. Corrugated guardrails typically use steel as their base material. Long-term exposure to the complex outdoor environment makes them susceptible to various factors such as sunlight, rain and snow erosion, air pollution, and salt spray corrosion, leading to surface rust and coating peeling. This not only affects the aesthetic appearance of the guardrail but also weakens the structural strength of the base material, shortens the service life of the guardrail, and increases subsequent maintenance costs.

[0003] Currently, the existing anti-corrosion treatment methods for corrugated guardrails mostly adopt traditional galvanizing or single powder coating. Although galvanizing has a certain anti-corrosion performance, the galvanizing process generates zinc-containing wastewater, exhaust gas and other pollutants, causing serious environmental pollution. Moreover, it consumes a large amount of zinc resources, which is inconsistent with the development concept of environmental protection and energy conservation. Single powder coating has weak adhesion to the substrate, and after long-term use, problems such as coating cracking and peeling are prone to occur, resulting in insufficient anti-corrosion durability. Especially in harsh environments such as coastal areas, high-altitude cold regions, and high-pollution areas, it is difficult to meet the long-term anti-corrosion requirements.

[0004] In addition, although some improved anti-corrosion treatment methods have introduced multiple coating processes, there are problems such as the presence of harmful substances such as chromium and heavy metals in auxiliary materials such as cleaning fluids and film-forming agents, resulting in substandard environmental performance; or the coating curing temperature is too high and the energy consumption is high, which does not meet the energy-saving requirements; at the same time, some processes have problems such as low precision in coating thickness control, poor adhesion, and insufficient resistance to salt spray corrosion, making it difficult to balance environmental protection, energy saving and anti-corrosion durability.

[0005] Therefore, developing an environmentally friendly and energy-saving anti-corrosion treatment method for corrugated guardrails that is technologically sound, environmentally friendly and pollution-free, low in energy consumption, and can effectively improve the anti-corrosion performance and service life of corrugated guardrails, as well as corrugated guardrails prepared using this method, has become a pressing technical problem to be solved in this field. Summary of the Invention

[0006] The technical problem to be solved by this invention is to provide a composite anti-corrosion process for corrugated guardrail plastic coating-water-based paint. This process has standardized steps, uses materials that meet environmental protection standards, has low energy consumption, and can effectively improve the adhesion between the guardrail coating and the substrate, enhance anti-corrosion performance, and extend service life. At the same time, this invention also provides an environmentally friendly and energy-saving corrugated guardrail prepared using this anti-corrosion process. This guardrail has a reasonable structure, excellent anti-corrosion durability, and meets the requirements for use of road traffic safety facilities.

[0007] To solve the above-mentioned technical problems, the technical solution provided by the present invention is: an environmentally friendly and energy-saving anti-corrosion treatment method for corrugated guardrails, comprising the following steps:

[0008] S1. Pre-treatment: Select a plate-type base material that conforms to the current corrugated guardrail standard, remove oxide scale, rust, oil and impurities from the surface of the base material, and ensure that the surface of the base material is clean and free of protrusions or depressions.

[0009] S2. Cleaning with cleaning solution: Place the pretreated substrate into the cleaning tank and immerse it in a neutral and environmentally friendly cleaning solution. The temperature of the cleaning solution is controlled at 30-50℃ and the cleaning time is 10-20 minutes. The fine oil and dust remaining on the surface of the substrate are removed through the penetration and emulsification of the cleaning solution.

[0010] S3, First-level water washing: The substrate after being cleaned with the cleaning solution is sent into the water washing tank and rinsed with room temperature tap water. The rinsing pressure is controlled at 0.2-0.4MPa and the rinsing time is 3-5 minutes to thoroughly remove the cleaning solution residue adhering to the surface of the substrate.

[0011] S4. Coating treatment: Immerse the substrate after primary water washing into the coating treatment tank, and use a chromium-free environmentally friendly coating agent for surface treatment. The temperature of the coating agent is controlled at 40-60℃, and the treatment time is 5-10 minutes. A uniform conversion film is formed on the surface of the substrate, which enhances the adhesion between the substrate and the subsequent anti-corrosion layer.

[0012] S5, Secondary water washing: The substrate after the coating treatment is sent into the secondary water washing tank and soaked and rinsed with deionized water for 5-8 minutes to remove the coating agent residue on the surface of the substrate and prevent the residual agent from affecting the performance of the subsequent anti-corrosion layer.

[0013] S6. Drying: The substrate after secondary water washing is sent into the drying equipment. The drying temperature is controlled at 120-180℃ and the drying time is 20-40 minutes to ensure that the surface of the substrate is completely dry and there is no moisture residue.

[0014] S7. Powder Coating: An electrostatic powder coating process is used to evenly spray environmentally friendly powder coating onto the dried substrate surface. The coating thickness is controlled at 60-120μm to ensure a uniform coating without any missed spots or bubbles.

[0015] S8, First-stage curing: The powder-coated substrate is sent into a curing oven. The curing temperature is controlled at 180-220℃ and the curing time is 15-25 minutes, so that the powder coating can be fully melted, leveled and cured to form a dense first anti-corrosion plastic layer.

[0016] S9. Spray painting: When the substrate after primary curing cools to 80-100℃, use electrostatic spraying process to evenly spray water-based environmentally friendly paint onto the surface of the first anti-corrosion plastic layer. The paint thickness is controlled at 20-40μm to ensure that the paint film is uniform and firmly adhered.

[0017] S10, Secondary Curing: The painted substrate is sent back into the curing oven. The curing temperature is controlled at 100-140℃ and the curing time is 10-15 minutes to fully cure the water-based environmentally friendly paint and form a dense second anti-corrosion paint layer.

[0018] S11. Cooling: The substrate after secondary curing is sent into the cooling channel and cooled to room temperature by natural cooling or forced air cooling for 20-30 minutes.

[0019] S12. Finished Product Inspection and Packaging: After cooling, the guardrail is inspected for appearance, thickness, adhesion, and corrosion resistance. After passing the tests, it is packaged to obtain the finished environmentally friendly and energy-saving corrugated guardrail.

[0020] Furthermore, the neutral and environmentally friendly cleaning solution comprises the following components by weight percentage: 3-8% surfactant, 2-5% chelating agent, 1-3% corrosion inhibitor, and the balance being deionized water; the surfactant is fatty alcohol polyoxyethylene ether, the chelating agent is disodium ethylenediaminetetraacetate, and the corrosion inhibitor is hexamethylenetetraacetate. This neutral and environmentally friendly cleaning solution is free of phosphorus and heavy metals, environmentally friendly and pollution-free, and possesses excellent detergency and emulsification properties, effectively removing fine oil and dust from the substrate surface, while the addition of the corrosion inhibitor prevents the substrate from being corroded during the cleaning process.

[0021] Furthermore, the chromium-free environmentally friendly coating agent is a zirconium-based coating agent, with its concentration controlled at 50-80 g / L, and the pH value maintained at 3.5-5.0 during the treatment process. The zirconium-based coating agent replaces the traditional chromium-based coating agent, avoiding chromium pollution at the source and exhibiting excellent environmental performance. Simultaneously, under these concentration and pH conditions, a uniform and dense conversion film can be formed on the substrate surface. This conversion film has good adhesion to the substrate and subsequent anti-corrosion layers, significantly improving the stability of the overall anti-corrosion system.

[0022] Furthermore, the environmentally friendly powder coating is an epoxy resin powder coating or a polyester resin powder coating, and the water-based environmentally friendly paint is a water-based acrylic paint or a water-based polyurethane paint. Both the powder coating and the water-based paint comply with the environmental standards of GB / T20077-2006 "Thermoplastic Powder Coatings" and GB / T23999-2009 "Water-based Coatings". Epoxy resin powder coatings or polyester resin powder coatings have excellent corrosion resistance, abrasion resistance, and adhesion, while water-based acrylic paints or water-based polyurethane paints have advantages such as being environmentally friendly, pollution-free, and having good film-forming properties. The combined use of these two materials forms a double anti-corrosion barrier, further enhancing the corrosion resistance of the guardrail.

[0023] Furthermore, the electrostatic voltage for electrostatic powder coating is controlled at 60-80kV, and the spray distance is controlled at 200-300mm; the electrostatic voltage for electrostatic spraying is controlled at 40-60kV, and the spray distance is controlled at 150-250mm. By precisely controlling the electrostatic voltage and spray distance, it can be ensured that the powder coating and water-based paint are uniformly sprayed onto the substrate surface, avoiding defects such as missed spraying, bubbles, and sagging, and ensuring the uniformity of the coating thickness.

[0024] Furthermore, the total thickness of the first anti-corrosion plastic layer and the second anti-corrosion paint layer is controlled between 80-160 μm, and the adhesion of both anti-corrosion layers meets the Class 1 standard in GB / T9286-1998 "Cross-cut test of paint and varnish film". This thickness range ensures the anti-corrosion durability of the guardrail while avoiding resource waste and increased energy consumption caused by excessive coating thickness. The Class 1 adhesion standard ensures that the coating will not peel off or crack during long-term use.

[0025] The present invention also provides an environmentally friendly and energy-saving corrugated guardrail, which is prepared by any of the anti-corrosion treatment methods described above, and includes a corrugated guardrail substrate. The surface of the substrate is sequentially provided with a film conversion layer, a first anti-corrosion plastic layer and a second anti-corrosion paint layer. The plate shape of the corrugated guardrail substrate conforms to the standard requirements of GB / T31439.1-2015 "Corrugated Beam Steel Guardrail Part 1: General Rules".

[0026] Furthermore, the thickness of the film conversion layer is 0.5-2μm, the thickness of the first anti-corrosion plastic layer is 60-120μm, and the thickness of the second anti-corrosion paint layer is 20-40μm; the salt spray corrosion resistance of the guardrail meets the standard of no rust after 1000 hours of neutral salt spray test in GB / T10125-2021 "Artificial Atmosphere Corrosion Test - Salt Spray Test". This corrugated guardrail design, through the synergistic effect of the film conversion layer, the first anti-corrosion plastic layer, and the second anti-corrosion paint layer, possesses excellent salt spray corrosion resistance, weather resistance, and mechanical properties, adapting to the usage requirements of various complex outdoor environments and offering a long service life.

[0027] The advantages of this invention compared to the prior art are:

[0028] The neutral environmentally friendly cleaning liquid, chromium-free environmentally friendly film-forming agent, environmentally friendly powder coating, and water-based environmentally friendly paint used in this invention all meet relevant environmental protection standards. They are free of chromium, heavy metals, and harmful volatile substances, thus avoiding environmental pollution from the source of the process and conforming to the current concept of environmental protection development. At the same time, there is no discharge of pollutants such as wastewater and exhaust gas during the process, making it environmentally friendly and pollution-free.

[0029] This invention optimizes the temperature and time parameters of each process step. The drying and curing temperatures are lower than those of traditional processes, and the secondary curing temperature is much lower than the primary curing temperature, effectively reducing energy consumption. At the same time, the process steps are reasonably connected with no redundant processes, which improves production efficiency and further reduces production costs.

[0030] This invention adopts a three-layer anti-corrosion structure consisting of a "film conversion layer + a first anti-corrosion plastic layer + a second anti-corrosion paint layer". The film conversion layer can enhance the bonding force between the substrate and the anti-corrosion layer. The first anti-corrosion plastic layer has excellent corrosion resistance and wear resistance. The second anti-corrosion paint layer can further improve the weather resistance and anti-corrosion performance of the guardrail, effectively resist the erosion of complex outdoor environments, and significantly extend the service life of the corrugated guardrail.

[0031] The anti-corrosion treatment method of the present invention has clear steps and well-defined parameters. Each process parameter can be precisely controlled, which can ensure the stability of product quality. At the same time, all the equipment used are existing mature equipment, which does not require large-scale equipment modification and is easy to realize industrial production and promotion. Detailed Implementation

[0032] Various exemplary embodiments of the present invention will now be described in detail. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention.

[0033] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0034] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0035] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0036] The following is a detailed description of the anti-corrosion process of the corrugated guardrail plastic layer-water-based paint and the corrugated guardrail of the present invention.

[0037] The present invention discloses a composite anti-corrosion process for corrugated guardrails using a plastic coating and water-based paint, and the specific implementation process of the corrugated guardrails is as follows:

[0038] Example 1

[0039] An environmentally friendly and energy-saving anti-corrosion treatment method for corrugated guardrails includes the following steps:

[0040] S1. Pretreatment: Select Q235 corrugated guardrail base material that conforms to GB / T31439.1-2015 "Corrugated Beam Steel Guardrail Part 1: General Rules" standard, and use shot blasting to remove oxide scale, rust, oil and impurities from the surface of the base material. After treatment, the surface of the base material is clean and free of protrusions or depressions, and the roughness is controlled within Ra3.2-6.3μm.

[0041] S2. Cleaning with cleaning solution: The pretreated substrate is placed in a cleaning tank and immersed in a neutral and environmentally friendly cleaning solution. The neutral and environmentally friendly cleaning solution consists of the following components by weight percentage: 3% fatty alcohol polyoxyethylene ether, 2% disodium ethylenediaminetetraacetate, 1% hexamethylenetetraacetate, and the balance is deionized water. The temperature of the cleaning solution is controlled at 30°C, and the cleaning time is 20 minutes.

[0042] S3, First-level water wash: The substrate after being cleaned with the cleaning solution is sent into the water washing tank and rinsed with room temperature tap water. The rinsing pressure is controlled at 0.2MPa and the rinsing time is 5 minutes to thoroughly remove the cleaning solution residue adhering to the surface of the substrate.

[0043] S4. Coating treatment: The substrate after primary water washing is immersed in the coating treatment tank, and a zirconium-based chromium-free environmentally friendly coating agent is used for surface treatment. The concentration of the coating agent is controlled at 50g / L, the pH value is maintained at 3.5, the temperature of the coating agent is controlled at 40℃, and the treatment time is 10 minutes, forming a uniform coating conversion layer on the surface of the substrate.

[0044] S5, Secondary water wash: The substrate after film treatment is sent into the secondary water wash tank and soaked and rinsed with deionized water for 8 minutes to remove film agent residue on the surface of the substrate.

[0045] S6. Drying: The substrate after secondary water washing is sent into the drying oven. The drying temperature is controlled at 120℃ and the drying time is 40 minutes to ensure that the surface of the substrate is completely dry and there is no moisture residue.

[0046] S7. Powder Coating: An electrostatic powder coating process is adopted to uniformly spray epoxy resin powder coating (compliant with GB / T20077-2006 standard) onto the dried substrate surface. The electrostatic voltage is controlled at 60kV, the spray distance is controlled at 200mm, and the coating thickness is controlled at 60μm to ensure that the coating is uniform, without missed spraying, and without bubbles.

[0047] S8, First-stage curing: The powder-coated substrate is sent into a curing oven, the curing temperature is controlled at 180℃, and the curing time is 25 minutes, so that the powder coating can be fully melted, leveled and cured to form the first anti-corrosion plastic layer.

[0048] S9. Spray painting: When the substrate after primary curing cools to 80℃, use electrostatic spraying process to evenly spray water-based acrylic paint (compliant with GB / T23999-2009 standard) onto the surface of the first anti-corrosion plastic layer. The electrostatic voltage is controlled at 40kV, the spray distance is controlled at 150mm, and the paint thickness is controlled at 20μm to ensure that the paint film is uniform and firmly adhered.

[0049] S10, Secondary Curing: The painted substrate is sent back into the curing oven, the curing temperature is controlled at 100℃, and the curing time is 15 minutes, so that the water-based paint is fully cured and a second anti-corrosion paint layer is formed.

[0050] S11. Cooling: The substrate after secondary curing is sent into the cooling channel and cooled to room temperature by natural cooling for 30 minutes.

[0051] S12. Finished Product Inspection and Packaging: After cooling, the guardrail undergoes visual inspection (no defects such as missed spraying, bubbles, or cracks), thickness testing (total coating thickness 80μm), adhesion testing (meeting the Class 1 standard in GB / T9286-1998), and sampling inspection of corrosion resistance (no rust after 1000 hours of neutral salt spray test, meeting the standard in GB / T10125-2021). After passing the inspection, the guardrail is packaged to obtain the finished environmentally friendly and energy-saving corrugated guardrail.

[0052] Example 2

[0053] An environmentally friendly and energy-saving anti-corrosion treatment method for corrugated guardrails includes the following steps:

[0054] S1. Pretreatment: Select Q235 corrugated guardrail base material conforming to GB / T31439.1-2015 "Corrugated Beam Steel Guardrail Part 1: General Rules" standard. Use pickling + grinding to remove oxide scale, rust, oil and impurities from the surface of the base material. After treatment, the surface of the base material is clean and free of protrusions or depressions. The roughness is controlled within Ra3.2-6.3μm.

[0055] S2. Cleaning with cleaning solution: The pretreated substrate is placed in a cleaning tank and immersed in a neutral and environmentally friendly cleaning solution. The neutral and environmentally friendly cleaning solution consists of the following components by weight percentage: 5% fatty alcohol polyoxyethylene ether, 3.5% disodium ethylenediaminetetraacetate, 2% hexamethylenetetraacetate, and the balance is deionized water. The temperature of the cleaning solution is controlled at 40°C and the cleaning time is 15 minutes.

[0056] S3, First-level water wash: The substrate after being cleaned with the cleaning solution is sent into the water washing tank and rinsed with room temperature tap water. The rinsing pressure is controlled at 0.3MPa and the rinsing time is 4 minutes to thoroughly remove the cleaning solution residue adhering to the surface of the substrate.

[0057] S4. Coating Treatment: The substrate after primary water washing is immersed in a coating treatment tank, and a zirconium-based chromium-free environmentally friendly coating agent is used for surface treatment. The concentration of the coating agent is controlled at 65g / L, the pH value is maintained at 4.2, the temperature of the coating agent is controlled at 50℃, and the treatment time is 7 minutes, forming a uniform coating conversion layer on the surface of the substrate.

[0058] S5, Secondary water wash: The substrate after film treatment is sent into the secondary water wash tank and soaked and rinsed with deionized water for 6.5 minutes to remove film agent residue from the surface of the substrate.

[0059] S6. Drying: The substrate after secondary water washing is sent into the drying oven. The drying temperature is controlled at 150℃ and the drying time is 30 minutes to ensure that the surface of the substrate is completely dry and there is no moisture residue.

[0060] S7. Powder Coating: The electrostatic powder coating process is adopted to uniformly spray polyester resin powder coating (compliant with GB / T20077-2006 standard) onto the dried substrate surface. The electrostatic voltage is controlled at 70kV, the spray distance is controlled at 250mm, and the coating thickness is controlled at 90μm to ensure that the coating is uniform, without missed spraying, and without bubbles.

[0061] S8. First-stage curing: The powder-coated substrate is sent into a curing oven, the curing temperature is controlled at 200℃, and the curing time is 20 minutes, so that the powder coating can be fully melted, leveled and cured to form the first anti-corrosion plastic layer.

[0062] S9. Spray painting: When the substrate after primary curing cools to 90℃, use electrostatic spraying process to evenly spray water-based polyurethane paint (compliant with GB / T23999-2009 standard) onto the surface of the first anti-corrosion plastic layer. The electrostatic voltage is controlled at 50kV, the spray distance is controlled at 200mm, and the paint thickness is controlled at 30μm to ensure that the paint film is uniform and firmly adhered.

[0063] S10, Secondary Curing: The painted substrate is sent back into the curing oven, the curing temperature is controlled at 120℃, and the curing time is 12 minutes, so that the water-based paint is fully cured and a second anti-corrosion paint layer is formed.

[0064] S11. Cooling: The substrate after secondary curing is sent into the cooling channel and cooled to room temperature by forced air cooling for 25 minutes.

[0065] S12. Finished Product Inspection and Packaging: After cooling, the guardrail undergoes visual inspection (no defects such as missed spraying, bubbles, or cracks), thickness testing (total coating thickness 120μm), adhesion testing (meeting the Class 1 standard in GB / T9286-1998), and sampling inspection of corrosion resistance (no rust after 1000 hours of neutral salt spray test, meeting the standard in GB / T10125-2021). After passing the inspection, the guardrail is packaged to obtain the finished environmentally friendly and energy-saving corrugated guardrail.

[0066] Example 3

[0067] An environmentally friendly and energy-saving anti-corrosion treatment method for corrugated guardrails includes the following steps:

[0068] S1. Pretreatment: Select Q235 corrugated guardrail base material conforming to GB / T31439.1-2015 "Corrugated Beam Steel Guardrail Part 1: General Rules" standard. Use sandblasting to remove oxide scale, rust, oil and impurities from the surface of the base material. After treatment, the surface of the base material is clean and free of protrusions or depressions. The roughness is controlled within Ra3.2-6.3μm.

[0069] S2. Cleaning with cleaning solution: The pretreated substrate is placed in a cleaning tank and immersed in a neutral and environmentally friendly cleaning solution. The neutral and environmentally friendly cleaning solution consists of the following components by weight percentage: 8% fatty alcohol polyoxyethylene ether, 5% disodium ethylenediaminetetraacetate, 3% hexamethylenetetraacetate, and the balance is deionized water. The temperature of the cleaning solution is controlled at 50°C, and the cleaning time is 10 minutes.

[0070] S3, First-level water wash: The substrate after being cleaned with the cleaning solution is sent into the water washing tank and rinsed with room temperature tap water. The rinsing pressure is controlled at 0.4MPa and the rinsing time is 3 minutes to thoroughly remove the cleaning solution residue adhering to the surface of the substrate.

[0071] S4. Coating Treatment: The substrate after primary water washing is immersed in a coating treatment tank, and a zirconium-based chromium-free environmentally friendly coating agent is used for surface treatment. The concentration of the coating agent is controlled at 80g / L, the pH value is maintained at 5.0 during the treatment process, the temperature of the coating agent is controlled at 60℃, and the treatment time is 5 minutes, forming a uniform coating conversion layer on the surface of the substrate.

[0072] S5, Secondary water wash: The substrate after film treatment is sent into a secondary water wash tank and soaked and rinsed with deionized water for 5 minutes to remove film agent residue from the surface of the substrate.

[0073] S6. Drying: The substrate after secondary water washing is sent into the drying oven. The drying temperature is controlled at 180℃ and the drying time is 20 minutes to ensure that the surface of the substrate is completely dry and there is no moisture residue.

[0074] S7. Powder Coating: An electrostatic powder coating process is adopted to uniformly spray epoxy resin powder coating (compliant with GB / T20077-2006 standard) onto the dried substrate surface. The electrostatic voltage is controlled at 80kV, the spray distance is controlled at 300mm, and the coating thickness is controlled at 120μm to ensure that the coating is uniform, without missed spraying, and without bubbles.

[0075] S8. First-stage curing: The powder-coated substrate is sent into a curing oven, the curing temperature is controlled at 220℃, and the curing time is 15 minutes, so that the powder coating can be fully melted, leveled and cured to form the first anti-corrosion plastic layer.

[0076] S9. Spray painting: When the substrate after primary curing cools to 100℃, use electrostatic spraying process to evenly spray water-based acrylic paint (compliant with GB / T23999-2009 standard) onto the surface of the first anti-corrosion plastic layer. The electrostatic voltage is controlled at 60kV, the spray distance is controlled at 250mm, and the paint thickness is controlled at 40μm to ensure that the paint film is uniform and firmly adhered.

[0077] S10, Secondary Curing: The painted substrate is sent back into the curing oven, the curing temperature is controlled at 140℃, and the curing time is 10 minutes, so that the water-based paint is fully cured and a second anti-corrosion paint layer is formed.

[0078] S11. Cooling: The substrate after secondary curing is sent into the cooling channel and cooled to room temperature by forced air cooling for 20 minutes.

[0079] S12. Finished Product Inspection and Packaging: After cooling, the guardrail undergoes visual inspection (no defects such as missed spraying, bubbles, or cracks), thickness testing (total coating thickness 160μm), adhesion testing (meets the Class 1 standard in GB / T9286-1998), and sampling inspection of corrosion resistance (no rust after 1000 hours of neutral salt spray test, meeting the standard in GB / T10125-2021). After passing the tests, the guardrail is packaged to obtain the finished environmentally friendly and energy-saving corrugated guardrail.

[0080] The environmentally friendly and energy-saving corrugated guardrails prepared in Examples 1-3 above were subjected to performance testing. The test results are shown in Table 1 below:

[0081] Table 1: Performance Test Data of Wave-Shaped Guardrail

[0082]

[0083] As shown in Table 1, the environmentally friendly and energy-saving corrugated guardrail prepared by this invention meets the relevant standard requirements in all aspects, has excellent corrosion resistance and durability, good environmental performance, and can meet the long-term use needs of road traffic safety facilities.

[0084] The present invention and its embodiments have been described above. This description is not restrictive. If a person skilled in the art is inspired by this description and designs a similar structure and embodiment without departing from the spirit of the present invention, such design should fall within the protection scope of the present invention.

Claims

1. A wave-shaped guardrail plastic layer-water-based paint composite anticorrosion process, characterized in that, The method comprises the following steps: S1, pretreatment: selecting a plate-shaped substrate conforming to the current wave-shaped guardrail standard, removing the oxide skin, rust, oil stains and impurities on the surface of the substrate, and ensuring that the surface of the substrate is clean, free of protrusions or recessed defects; S2, cleaning liquid cleaning: placing the pretreated substrate into a cleaning tank, soaking and cleaning the substrate with a neutral environment-friendly cleaning liquid, controlling the temperature of the cleaning liquid at 30-50 DEG C, and cleaning for 10-20 minutes, removing the residual fine oil stains and dust on the surface of the substrate through the penetration and emulsification of the cleaning liquid; S3, first-stage water washing: sending the substrate cleaned by the cleaning liquid into a water washing tank, spraying and flushing the substrate with tap water at room temperature, controlling the flushing pressure at 0.2-0.4 MPa, and flushing for 3-5 minutes to completely remove the residual cleaning liquid attached to the surface of the substrate; S4, film treatment: immersing the substrate washed by the first-stage water into a film treatment tank, treating the surface of the substrate with a chromium-free environment-friendly film agent, controlling the temperature of the film agent at 40-60 DEG C, and treating for 5-10 minutes to form a uniform conversion film on the surface of the substrate; S5, second-stage water washing: sending the substrate treated by the film into a second-stage water washing tank, immersing and flushing the substrate with deionized water, and flushing for 5-8 minutes to remove the residual film agent on the surface of the substrate; S6, drying: sending the substrate washed by the second-stage water into a drying device, controlling the drying temperature at 120-180 DEG C, and drying for 20-40 minutes to ensure that the surface of the substrate is completely dry and free of water residue; S7, plastic spraying: uniformly spraying an environment-friendly powder coating on the surface of the dried substrate by using an electrostatic plastic spraying process, controlling the spraying thickness at 60-120 μm, and ensuring that the coating is uniform, free of spraying leakage and bubbles; S8, first-stage solidification: sending the substrate sprayed with plastic into a solidification furnace, controlling the solidification temperature at 180-220 DEG C, and solidifying for 15-25 minutes to make the powder coating melt, flow and solidify, and form a dense first corrosion-resistant plastic layer; S9, paint spraying: when the substrate solidified by the first stage cools to 80-100 DEG C, uniformly spraying a water-based environment-friendly paint on the surface of the first corrosion-resistant plastic layer by using an electrostatic spraying process, and controlling the paint spraying thickness at 20-40 μm; S10, second-stage solidification: sending the substrate sprayed with paint into a solidification furnace again, controlling the solidification temperature at 100-140 DEG C, and solidifying for 10-15 minutes to make the water-based paint solidify completely and form a dense second corrosion-resistant paint layer; S11, cooling: sending the substrate solidified by the second stage into a cooling channel, and cooling to room temperature by using natural cooling or forced air cooling, and cooling for 20-30 minutes; S12, finished product inspection and packaging: performing appearance inspection, thickness detection, adhesion detection and corrosion resistance sampling detection on the cooled guardrail, packaging the guardrail after the detection is qualified, and obtaining the finished environment-friendly and energy-saving wave-shaped guardrail.

2. The process according to claim 1, characterized in that: The neutral environment-friendly cleaning liquid is composed of the following components by weight percentage: 3-8% of a surfactant, 2-5% of a chelating agent, 1-3% of an inhibitor, and the balance of deionized water; the surfactant is a fatty alcohol polyoxyethylene ether, the chelating agent is disodium ethylenediaminetetraacetate, and the inhibitor is urotropine.

3. The process according to claim 2, wherein the process is characterized by: The chromium-free environment-friendly film agent is a zirconium-based film agent, the concentration of which is controlled at 50-80 g / L, and the pH value is maintained at 3.5-5.0 during the treatment process.

4. The process according to claim 3, wherein the process is characterized by: The environment-friendly powder coating is an epoxy resin powder coating or a polyester resin powder coating, and the water-based environment-friendly paint is a water-based acrylic paint or a water-based polyurethane paint.

5. The process as claimed in claim 4, wherein the process is a composite anticorrosion process for corrugated guard rail painting with water-based paint. The electrostatic voltage of the electrostatic plastic spraying is controlled at 60-80 kV, and the spraying distance is controlled at 200-300 mm; the electrostatic voltage of the electrostatic paint spraying is controlled at 40-60 kV, and the spraying distance is controlled at 150-250 mm.

6. The process for plastic coating and water-based paint composite anticorrosion of a wave-shaped guardrail according to claim 5, characterized in that: The total thickness of the first anticorrosive plastic layer and the second anticorrosive paint layer is controlled at 80-160 μm.

7. An environment-friendly and energy-saving wave-shaped guardrail, characterized in that, The anticorrosive process is prepared by using the anticorrosive process according to any one of claims 1-6, and includes a wave-shaped guardrail base material, the surface of the base material is sequentially provided with a film conversion layer, a first anticorrosive plastic layer and a second anticorrosive paint layer.

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