Protective coating for containers and engineering equipment and primer for industrial metal surfaces

Abstract

The invention provides a protective coating for containers and engineering equipment and primer for industrial metal surfaces. The protective coating for the engineering equipment is characterized by comprising a bottom layer, a middle layer and a surface layer which are arranged in sequence, the bottom layer is attached to engineering equipment, the bottom layer is made of primer containing 0.1-20% of zinc by mass, the middle layer is made of epoxy powder, and the surface layer is made of epoxy powder or polyester powder. The invention breaks the tradition of adopting zinc-rich primer at present, creatively reduces the zinc content in the primer, reduces the corrosion expansion phenomenon, inhibits the cathodic reaction, and improves the anti-corrosion capability of the coating.

Description

Technical Field

[0001] This invention relates to the field of protective technology, and in particular to a protective coating for engineering equipment and a primer for industrial metal surfaces. Background Technology

[0002] Currently, engineering equipment often requires coatings on metal surfaces. For equipment operating in high salt spray environments or requiring high corrosion resistance, the following protective coatings can be used: zinc-rich primer and two layers of dense powder coating. However, in high salt spray environments, these protective coatings fail to provide the expected corrosion protection, resulting in severe corrosion propagation.

[0003] Therefore, how to reduce erosion is an urgent problem to be solved. Summary of the Invention

[0004] The purpose of this invention is to provide a primer for industrial metal surfaces, a protective coating for engineering equipment, and a container with good resistance to corrosion, so as to solve the problems in the prior art.

[0005] To solve the above-mentioned technical problems, the present invention provides a protective coating for engineering equipment, comprising a base layer, an intermediate layer and a top layer arranged sequentially; the base layer is adhered to the engineering equipment, the material of the base layer is a primer containing 0.1-20% zinc by mass percentage, the material of the intermediate layer is epoxy powder, and the material of the top layer is epoxy powder or polyester powder.

[0006] In one embodiment, the primer is a high-solids oil-based paint, wherein the solids content of the high-solids oil-based paint is not less than 60%.

[0007] In one embodiment, the primer comprises, by weight percentage, 13.75-27% modified epoxy resin, 0.1-20% zinc powder, 5.5-13.5% anti-rust pigment, 1.65-4.5% cyclohexanone, 4.4-9% xylene, 1.65-5.4% n-butanol, 4.4-18% curing agent, 0.275-9% non-metallic conductive material, and 10-25% mixed additives, with the remainder being pigments and fillers; The mixed additives, by mass percentage, include 5-7% siloxane, 12-15% iron-phosphorus powder, 8-12% iron-titanium powder, 5-10% hematite powder, 20-27% cyclohexanone, and 34-42% n-butanol, wherein the siloxane, iron-phosphorus powder, iron-titanium powder, and hematite powder are all in flake and / or spherical form.

[0008] In one embodiment, the siloxane, the iron-phosphorus powder, the iron-titanium powder, and the hematite powder are mixed with the cyclohexanone and the n-butanol, and stirred at a speed of 1500~1750 r / min for 1~1.5 hours, and then stirred at 200~300 r / min and 70~85°C for 1~2 hours to obtain the mixed additive.

[0009] In one embodiment, the non-metallic conductive material includes at least one of graphite, graphene, and conductive mica.

[0010] In one embodiment, the thickness of the bottom layer is less than the thickness of the intermediate layer, and the thickness of the bottom layer is less than the thickness of the top layer.

[0011] In one embodiment, the epoxy powder of the intermediate layer comprises, by weight percentage: 22-45% epoxy resin, 25-50% polyester resin, 0.1-2.4% accelerator, 1-10% phenolic curing agent, 0.1-2% degassing agent, 0.5-2% leveling agent, 0.2-2% toughening agent, and 5-30% composite filler, with the remainder being pigments and fillers.

[0012] In one embodiment, the epoxy resin has an epoxy value of 0.090~0.165 eq / 100g and a softening point of 87~105℃; and / or, The viscosity of the polyester resin is 3000~6000 mPa·s, and the acid value is 34~76 mgKOH / g.

[0013] In one embodiment, when the surface layer is made of epoxy powder, the surface layer is located inside the engineering equipment; According to mass percentage, the epoxy powder of the surface layer comprises 20-36% epoxy resin, 30-60% polyester resin, 0.1-1% defoamer, 0.5-3% toughening agent, 0.5-1% leveling agent and 0.2-2% antioxidant, with the remainder being pigments and fillers.

[0014] In one embodiment, the epoxy resin has a softening point of 87~105℃ and an epoxy value of 0.090~0.165 eq / 100g; and / or, The viscosity of the polyester resin is 3000~6000 mPa·s, and the acid value is 34~76 mgKOH / g.

[0015] In one embodiment, when the surface layer is made of polyester powder, the surface layer is located outside the engineering equipment; According to the mass percentage, the polyester powder comprises 22-35% ultra-weather-resistant polyester resin, 30-45% high-weather-resistant polyester resin, 0-2.5% hydroxyalkylamide, 0.5-1.5% leveling agent, 0-3.5% triglycidyl isocyanate, 14-24% blocked polyisocyanate, 0.1-1% defoamer, 0.1-3% accelerator, 2-25% composite filler, 0.2-2% antioxidant, and 0.5-3.2% toughening agent, with the remainder being pigments and fillers; The ultra-weather-resistant polyester has a viscosity of 3200~4200 mPa·s and a hydroxyl value of 100~120 mgKOH / g; and / or, The high weather-resistant polyester has a viscosity of 4500~6000 mPa·s and an acid value of 29~34 mgKOH / g.

[0016] The present invention also provides a primer for industrial metal surfaces, wherein, by weight percentage, the primer comprises 13.75-27% modified epoxy resin, 0.1-20% zinc powder, 5.5-13.5% anti-rust pigment, 1.65-4.5% cyclohexanone, 4.4-9% xylene, 1.65-5.4% n-butanol, 4.4-18% curing agent, 0.275-9% non-metallic conductive material, and 10-25% mixed additives, with the remainder being pigments and fillers; The mixed additives, by mass percentage, include 5-7% siloxane, 12-15% iron-phosphorus powder, 8-12% iron-titanium powder, 5-10% hematite powder, 20-27% cyclohexanone, and 34-42% n-butanol, wherein the siloxane, iron-phosphorus powder, iron-titanium powder, and hematite powder are all in flake and / or spherical form.

[0017] The present invention also provides a container, including a container body and a protective coating disposed on the peripheral sidewall of the container body, wherein the protective coating is the above-mentioned protective coating for engineering equipment.

[0018] As can be seen from the above technical solution, the advantages and positive effects of the present invention are as follows: The protective coating of this invention comprises a three-layer structure: a base layer, an intermediate layer, and a top layer. The combination of these three layers ensures overall corrosion resistance. This invention breaks with the traditional use of zinc-rich primers, creatively reducing the zinc content in the primer, thereby reducing corrosion diffusion, slowing cathodic reactions, improving the coating's corrosion resistance, and extending its service life.

[0019] The industrial metal surface primer of this invention has a low zinc content and increases the content of siloxane, iron phosphate powder, titanium iron powder, and hematite powder. The lamellar structure of these powders effectively shields against the penetration of corrosive agents such as water and oxygen, cutting off pinholes in the coating and thus blocking or prolonging the path of corrosive media penetration. This reduces corrosion propagation, slows down cathodic reactions, improves the coating's corrosion resistance, and extends its service life. Furthermore, the use of non-metallic conductive materials ensures the overall conductivity of the primer. Attached Figure Description

[0020] Figure 1 This is a schematic flowchart of the construction method for the protective coating for engineering equipment in this invention.

[0021] Figure 2 This is a photograph of the primer applied to the steel in Example 4, magnified 15 times.

[0022] Figure 3 This is a photograph of the primer in Example 4 after a 28-day corrosion resistance test, magnified 15 times.

[0023] Figure 4 This is a photograph of the zinc-free primer applied to steel in Comparative Example 5, magnified 15 times.

[0024] Figure 5 This is a photograph of the zinc-free primer in Comparative Example 5 after a 28-day corrosion resistance test, magnified 15 times. Detailed Implementation

[0025] Typical embodiments embodying the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various variations in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations herein are for illustrative purposes only and not intended to limit the present invention.

[0026] To further illustrate the principles and structure of the present invention, preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0027] This invention provides a protective coating for engineering equipment, comprising a base layer, an intermediate layer, and a top layer arranged sequentially. The base layer is adhered to the engineering equipment and is made of a primer containing 0.1% to 20% zinc by weight. The intermediate layer is made of epoxy powder. The top layer is made of epoxy powder or polyester powder.

[0028] Among them, engineering equipment mainly refers to mechanical equipment used in relatively harsh environments. Examples include shipping containers, excavators, and bulldozers.

[0029] A relatively harsh environment refers to an environment that simultaneously contains moisture, gases, ultraviolet radiation, etc.

[0030] The base layer of the protective coating uses a primer with a low zinc content, which ensures corrosion resistance and reduces corrosion spread. The intermediate and top layers further enhance the overall corrosion resistance of the protective coating.

[0031] Specifically, the thickness of the bottom layer is less than the thickness of the middle layer. The thickness of the bottom layer is less than the thickness of the top layer.

[0032] In this embodiment, the thickness of the bottom layer is 8-12 micrometers. The thickness of the intermediate layer is 37-43 micrometers, the thickness of the inner surface layer is 38-43 micrometers, and the thickness of the outer surface layer is 44-46 micrometers. Among them, the engineering equipment is made by processing metal sheets, with the bottom layer pre-formed on the metal sheet.

[0033] The intermediate layer is formed on the bottom layer after the metal sheet bearing the load has been processed into engineering equipment. The top layer is formed on the intermediate layer.

[0034] The following section provides a detailed introduction to the bottom layer, middle layer, and top layer.

[0035] After research and analysis, the applicant discovered that in high-salt-spray environments, zinc-rich primers (containing 60% or even 80% or more zinc powder) corrode. A large amount of zinc powder transforms into zinc salts, causing volume expansion. However, the extremely dense powder coating on the primer cannot accommodate the expanded zinc salts, leading to separation of the coating from the metal and resulting in large-scale "peeling." Furthermore, as the zinc powder continues to corrode, the peeling extends, becoming increasingly severe over time, failing to provide adequate corrosion protection.

[0036] Since the corrosion propagation phenomenon is caused by the use of a large amount of zinc powder in the primer, the present invention provides a protective coating for engineering equipment. By reducing the zinc content of the primer, specifically, the zinc content is 0.1-20%, the zinc salt expansion caused by a large amount of zinc powder can be avoided, which leads to peeling of the outer dense powder coating and reduces the corrosion propagation phenomenon. At the same time, a small amount of zinc powder acts as a sacrificial anode in the corrosive environment and is preferentially corroded, thereby protecting the metal layer from corrosion to a certain extent and improving the corrosion resistance of the coating. In particular, when the engineering equipment is only coated with primer and has not yet been coated with dense powder coating, the primer is mainly relied upon as a temporary anti-corrosion layer.

[0037] Therefore, the protective coating in this solution reduces the overall coating's corrosion spread while ensuring the temporary anti-corrosion effect of the primer.

[0038] In some embodiments, the primer may be a high-solids oil-based paint, wherein the solids content of the high-solids oil-based paint is not less than 60%. Using a high-solids oil-based primer instead of a traditional zinc-rich primer can reduce the VOC (volatile organic compound) content, greatly reduce the impact on the environment and human health, and improve the physical shielding and corrosion protection effect.

[0039] In some embodiments, the primer includes a non-metallic conductive material. Generally, metals require welding. By reducing the zinc content and adding some non-metallic conductive material, the conductivity of the coating can be ensured, thereby guaranteeing weldability and facilitating subsequent welding.

[0040] This invention also provides a primer for industrial metal surfaces that can reduce corrosion propagation while maintaining good anti-corrosion performance. By reducing the zinc content and adding a shielding agent to block corrosive agents such as water and oxygen, it prevents these agents from contacting the metal, thereby further reducing corrosion propagation.

[0041] Specifically, by weight percentage, the primer comprises 13.75–27% modified epoxy resin, 0.1–20% zinc powder, 5.5–13.5% anti-rust pigment, 1.65–4.5% cyclohexanone, 4.4–9% xylene, 1.65–5.4% n-butanol, 4.4–18% curing agent, 0.275–9% non-metallic conductive material, and 10–25% mixed additives, with the remainder being pigments and fillers.

[0042] The mixture, by weight percentage, comprises 5-7% siloxane, 12-15% ferrophosphorus powder, 8-12% titanium iron powder, 5-10% hematite powder, 20-27% cyclohexanone, and 34-42% n-butanol. The siloxane, ferrophosphorus powder, titanium iron powder, and hematite powder are all in flake and / or spherical form. That is, the siloxane can be in flake, spherical, or a mixture of both. The ferrophosphorus powder can be in flake, spherical, or a mixture of both. The titanium iron powder can be in flake, spherical, or a mixture of both. The hematite powder can be in flake, spherical, or a mixture of both.

[0043] Specifically, the mixed additives include 6% siloxane, 14% iron phosphate powder, 10% iron titanium powder, 8% hematite powder, 24% cyclohexanone, and 38% n-butanol.

[0044] Modified epoxy resins can be isocyanate-modified epoxy resins, silicone-acrylic-modified epoxy resins, dimer acid-modified epoxy resins, acrylic-modified epoxy resins, low-polymerization-degree modified epoxy resins, and ZJ-101 epoxy-modified acrylic resin produced by Suzhou Shengjia Resin Co., Ltd., etc.

[0045] When the zinc content is greater than 20%, it not only increases the risk of corrosion propagation but also increases the overall cost of the primer. When the zinc content is less than 20%, by mixing it with additives, it is possible to effectively prevent corrosive agents from contacting the metal surface, thereby avoiding or even eliminating corrosion propagation.

[0046] The curing agent includes at least one of polyamide 650, modified polyamide, isocyanate trimer and triethylenetetramine.

[0047] Rust-preventive pigments include at least one of aluminum tripolyphosphate, zinc phosphate, zinc oxide, aluminum phosphate, zinc molybdate, and aluminum oxide.

[0048] Siloxanes are compounds containing Si-O-Si bonds. Specifically, siloxanes include at least one of γ-glycidyl etherpropyltrimethoxysilane, vinylsiloxane, and polydimethylsiloxane.

[0049] Ferrophosphate powder is mainly composed of iron and phosphorus. Ferrophosphate powder can be the composite ferrophosphate powder PF908B provided by Taihe Huijin.

[0050] Iron-titanium powder is mainly composed of an iron alloy of titanium and iron. It can be compounded by adding nano-sized titanium dioxide and calcium carbonate fillers, using iron oxide (Fe3O4) as a carrier.

[0051] Hematite powder is an oxide mineral with the chemical composition Fe2O3. Hematite powder can be selected from α-Fe2O3 or MICRONOX R02 supplied by PROMINDSA.

[0052] The length of the lamellar structures of siloxane, ferrophosphorus powder, ferrotitanium powder, and hematite powder is 3~5μm.

[0053] The spherical structures of siloxane, ferrophosphorus powder, ferrotitanium powder, and hematite powder have a diameter of 3~5μm.

[0054] Specifically, siloxane, iron phosphate powder, iron titanium powder, and hematite powder are mixed with cyclohexanone and n-butanol and stirred at a speed of 1500~1750 r / min for 1~1.5 hours, and then stirred at 200~300 r / min and 70~85℃ for 1~2 hours to obtain the mixed additive.

[0055] The microstructures of siloxanes, iron-phosphorus powder, iron-titanium powder, and hematite powder are plate-like, even in solutions of cyclohexanone and n-butanol. Non-metallic conductive materials include at least one of graphite, graphene, or conductive mica.

[0056] When the microstructure of siloxane, iron phosphate powder, iron titanium powder, and hematite powder is spherical, its microstructure remains spherical even in cyclohexanone and n-butanol solutions.

[0057] The pigments and fillers in the primer include, but are not limited to, at least one of titanium dioxide, iron oxide red, iron oxide yellow, ultramarine, phthalocyanine blue, phthalocyanine green, medium chrome yellow, DPP red, permanent red, permanent violet, barium sulfate, silica fume, wollastonite, mica powder, glass powder, quartz powder, carbon black, and titanium dioxide.

[0058] Specifically, when the microstructure of siloxane, iron phosphate powder, iron-titanium powder, and hematite powder is plate-like, adding mixed additives to the primer allows these plate-like siloxane, iron phosphate powder, iron-titanium powder, and hematite powder to effectively shield corrosive agents such as water and oxygen from penetrating, cutting off pinholes in the coating, thereby blocking or prolonging the penetration path of corrosive media and improving the coating's corrosion resistance. Therefore, this primer can inhibit corrosion on metal substrates, slow down cathodic reactions, ensure corrosion resistance while reducing corrosion propagation.

[0059] By weight percentage, the epoxy powder in the intermediate layer comprises 22-45% epoxy resin, 25-50% polyester resin, 0.1-2.4% accelerator, 1-10% phenolic curing agent, 0.1-2% degassing agent, 0.5-2% leveling agent, 0.2-2% toughening agent, and 5-30% composite filler, with the remainder being pigments and fillers.

[0060] The epoxy value of epoxy resin is 0.090 ~ 0.165 eq / 100g, and the softening point is 87~105℃.

[0061] The viscosity of the polyester resin is 3000~6000 mPa.s, and the acid value is 34~76 mgKOH / g.

[0062] The accelerator includes at least one of imidazoline, colorless cobalt, methyldiethanolamine, aminophenol, and 2,4,6-tris(dimethylaminomethyl)phenol.

[0063] The phenolic curing agent can be the 969H06 type phenolic curing agent produced by Daqing Qinglu Langrun Technology Co., Ltd., or other existing phenolic curing agents.

[0064] The degassing agent includes at least one of diphenylethanol ketone and stearic acid.

[0065] The leveling agent includes at least one of polyacrylic acid, acrylate polymers, polyether polyester modified organosiloxanes, acrylic acid, fluorinated acrylic acid, phosphate modified acrylic acid, acrylic resin, urea-formaldehyde resin and melamine-formaldehyde resin.

[0066] The toughening agent includes at least one of nano-silica, methyl methacrylate-butadiene-styrene terpolymer, dimethyl phthalate, diethyl phthalate, dibutyl phthalate, triethyl phosphate, and tributyl phosphate.

[0067] The composite filler includes at least one of alumina, boron nitride, zinc oxide, mica powder, and silica.

[0068] The pigments and fillers in the intermediate layer include, but are not limited to, at least one of titanium dioxide, iron oxide red, iron oxide yellow, ultramarine, phthalocyanine blue, phthalocyanine green, medium chrome yellow, DPP red, permanent red, permanent violet, barium sulfate, silica fume, wollastonite, mica powder, glass powder, quartz powder, carbon black, and titanium dioxide.

[0069] When the surface layer is made of epoxy powder, the surface layer is located inside the engineering equipment.

[0070] By weight percentage, the epoxy powder of the surface layer comprises 20-36% epoxy resin, 30-60% polyester resin, 0.1-1% defoamer, 0.5-3% toughening agent, 0.5-1% leveling agent, and 0.2-2% antioxidant, with the remainder being pigments and fillers.

[0071] The softening point of the epoxy resin in the top layer is 87~105℃, and the epoxy value is 0.090~0.165eq / 100g.

[0072] The viscosity of the polyester resin in the surface layer is 3000~6000 mPa.s, and the acid value is 34~76 mgKOH / g.

[0073] The defoamer for the surface layer includes at least one of TEGO Foamex 825, TEGO Foamex 810, BYK-028, BYK-024, TEGO-902W, defoamer NXZ, BYK Chemical's BYK-022 defoamer, polydimethylsiloxane defoamer, AKN-3324, benzoin, BYK-066N, and BYK085.

[0074] The toughening agent of the surface layer includes at least one of nano-silica, methyl methacrylate-butadiene-styrene terpolymer, dimethyl phthalate, diethyl phthalate, dibutyl phthalate, triethyl phosphate, and tributyl phosphate.

[0075] The leveling agent for the surface layer includes at least one of polyacrylic acid, acrylate polymers, polyether polyester modified organosiloxanes, acrylic acid, fluorinated acrylic acid, phosphate modified acrylic acid, acrylic resin, urea-formaldehyde resin, and melamine-formaldehyde resin.

[0076] The antioxidants in the topcoat include at least one of B215 complex antioxidant, β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate n-octadecyl alcohol ester, 2,6-tert-butyl-4-methylphenol, bis(3,5-tert-butyl-4-hydroxyphenyl) sulfide, and BASF antioxidant 1010.

[0077] The pigments and fillers in the surface layer include, but are not limited to, at least one of titanium dioxide, iron oxide red, iron oxide yellow, ultramarine, phthalocyanine blue, phthalocyanine green, medium chrome yellow, DPP red, permanent red, permanent violet, barium sulfate, silica fume, wollastonite, mica powder, glass powder, quartz powder, carbon black, and titanium dioxide.

[0078] When the surface layer is made of polyester powder, the surface layer is located outside the engineering equipment.

[0079] By weight percentage, the polyester powder comprises 22-35% ultra-weather-resistant polyester resin, 30-45% high-weather-resistant polyester resin, 0-2.5% hydroxyalkylamide, 0.5-1.5% leveling agent, 0-3.5% triglycidyl isocyanate, 14-24% blocked polyisocyanate, 0.1-1% defoamer, 0.1-3% accelerator, 2-25% composite filler, 0.2-2% antioxidant, and 0.5-3.2% toughening agent, with the remainder being pigments and fillers.

[0080] The viscosity of high weather-resistant polyester is 4500~6000 mPa·s, and the acid value is 29~34 mgKOH / g. High weather-resistant polyester refers to polyester that retains more than 50% of its gloss under a xenon lamp for 1000 hours and has a color difference of less than 5.

[0081] The viscosity of ultra-weather-resistant polyester is 3200~4200 mPa·s, and the hydroxyl value is 100~120 mgKOH / g. Ultra-weather-resistant polyester refers to polyester with a gloss retention rate of over 90% and a color difference of less than 3 after 1000 hours under an early xenon lamp.

[0082] Triglycidyl isocyanurate, abbreviated as TGIC.

[0083] Hydroxyalkylamide is abbreviated as HAA.

[0084] Blocked polyisocyanates can be any one or more of EVONIK's grades B1400, BF1540, and BF1320.

[0085] The leveling agent for the surface layer includes at least one of polyacrylic acid, acrylate polymers, polyether polyester modified organosiloxanes, acrylic acid, fluorinated acrylic acid, phosphate modified acrylic acid, acrylic resin, urea-formaldehyde resin, and melamine-formaldehyde resin.

[0086] The surface layer accelerator includes at least one of imidazoline, colorless cobalt, methyldiethanolamine, aminophenol, and 2,4,6-tris(dimethylaminomethyl)phenol.

[0087] The defoamer for the surface layer includes at least one of TEGO Foamex 825, TEGO Foamex 810, BYK-028, BYK-024, TEGO-902W, defoamer NXZ, BYK Chemical's BYK-022 defoamer, polydimethylsiloxane defoamer, AKN-3324, benzoin, BYK-066N, and BYK085.

[0088] The toughening agent of the surface layer includes at least one of nano-silica, methyl methacrylate-butadiene-styrene terpolymer, dimethyl phthalate, diethyl phthalate, dibutyl phthalate, triethyl phosphate, and tributyl phosphate.

[0089] The antioxidants in the topcoat include at least one of B215 complex antioxidant, β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate n-octadecyl alcohol ester, 2,6-tert-butyl-4-methylphenol, bis(3,5-tert-butyl-4-hydroxyphenyl) sulfide, and BASF antioxidant 1010.

[0090] The composite filler in the surface layer includes at least one of alumina, boron nitride, zinc oxide, mica powder, and silica.

[0091] The pigments and fillers in the surface layer are inorganic pigments and fillers, including but not limited to at least one of titanium dioxide, iron oxide red, iron oxide yellow, ultramarine, phthalocyanine blue, phthalocyanine green, medium chrome yellow, DPP red, permanent red, permanent violet, barium sulfate, silica fume, wollastonite, mica powder, glass powder, quartz powder, carbon black, and titanium dioxide.

[0092] See Figure 1 The application method for protective coatings on engineering equipment includes the following steps: S1. Provide metal sheets and perform rust removal and / or sandblasting treatment on the metal sheets.

[0093] S2. Provide a primer and heat the metal sheet and / or the primer, then perform a heat-applied coating, applying the primer to at least one side of the metal sheet. The primer, by weight percentage, comprises 13.75–27% modified epoxy resin, 0.1–20% zinc powder, 5.5–13.5% anti-rust pigment, 1.65–4.5% cyclohexanone, 4.4–9% xylene, 1.65–5.4% n-butanol, 4.4–18% curing agent, 0.275–9% non-metallic conductive material, and 10–25% mixed additives, with the remainder being pigments and fillers. The composition, by mass percentage, includes 5-7% siloxane, 12-15% ferrophosphorus powder, 8-12% titanium iron powder, 5-10% hematite powder, 20-27% cyclohexanone, and 34-42% n-butanol. The siloxane, ferrophosphorus powder, titanium iron powder, and hematite powder are all in flake and / or spherical form.

[0094] Specifically, when the thickness of the metal sheet is greater than 4mm, the metal sheet should be heated to 85℃ or higher.

[0095] S3. Air dry or bake the metal sheet coated with primer so that the primer forms a base layer on the metal sheet.

[0096] Specifically, hot air is used for air drying.

[0097] S4. The metal sheet with the bottom layer is processed and welded to form engineering equipment.

[0098] S5. Sandblasting treatment is applied to the welds of the engineering equipment.

[0099] S6. Apply epoxy powder to the base layer to form an intermediate layer.

[0100] S7. Apply epoxy powder or polyester powder to the intermediate layer to form the top layer.

[0101] Epoxy powder is sprayed onto the intermediate layer inside the housing.

[0102] Polyester powder is sprayed onto the intermediate layer of the outer casing.

[0103] S8. Curing and cooling to obtain a protective coating formed on the engineering equipment.

[0104] This invention provides a container, including a container body and a protective coating disposed on the peripheral sidewalls of the container body. The protective coating is the aforementioned protective coating for engineering equipment. The protective coating may be located on the inner side of the container body, on the outer side of the container body, or both the inner and outer sides of the container body may be provided with the protective coating.

[0105] The inventors of this application achieved the anti-corrosion properties of the primer and reduced the corrosion phenomenon by strictly designing the content of each component and the parameters in each step, as described below through various embodiments.

[0106] Example 1 In this embodiment, the protective coating consists of an 8-micrometer bottom layer, a 37-micrometer intermediate layer, and a 38-micrometer top layer.

[0107] The base layer is formed using a primer. By weight percentage, the primer comprises 13.75% low-polymerization modified epoxy resin, 20% zinc powder, 5.5% rust-preventive pigment alumina, 1.65% cyclohexanone, 9% xylene, 1.65% n-butanol, 18% curing agent isocyanate trimer, 0.275% non-metallic conductive material graphene, 25% mixed additives, and 5.175% pigment and filler titanium dioxide.

[0108] The mixed additives include 6% siloxane, 14% ferrophosphorus powder, 10% titanium iron powder, 8% hematite powder, 24% cyclohexanone, and 38% n-butanol. The siloxane, ferrophosphorus powder, titanium iron powder, and hematite powder are in flake form.

[0109] The epoxy powder in the intermediate layer comprises, by weight percentage, 30% polyester resin (acid value 54 mg KOH / g, viscosity 4500 mPa·s), 40% epoxy resin (epoxy value 0.12 eq / 100g, softening point 105℃), 5% phenolic curing agent (969H06 type phenolic curing agent produced by Daqing Qinglu Langrun Technology Co., Ltd.), 1% accelerator 2,4,6-tris(dimethylaminomethyl)phenol, 1% leveling agent fluorinated acrylic acid, 0.5% degassing agent diphenylethanol ketone, 0.5% degassing agent stearic acid, 15% composite filler alumina, 1% toughening agent diethyl phthalate, and 6% pigment filler phthalocyanine blue.

[0110] The epoxy powder in the surface layer comprises, by weight percentage, 45% polyester resin (acid value 54 mg KOH / g, viscosity 4500 mPa·s), 30% epoxy resin (epoxy value 0.110 eq / 100g, softening point 100℃), 0.5% leveling agent phosphate-modified acrylic, 0.5% defoamer BYK-024, 1% antioxidant 2,6-tributyl-4-methylphenol, and 2% toughening agent dibutyl phthalate, and 21% pigments and fillers mica powder and ultramarine.

[0111] Example 2 In this embodiment, the protective coating consists of a 10-micron bottom layer, a 40-micron intermediate layer, and a 40-micron top layer.

[0112] The base layer is formed using a primer. By weight percentage, the primer comprises 27% acrylic-modified epoxy resin, 0.1% zinc powder, 13.5% zinc molybdate (a rust-preventive pigment), 4.5% cyclohexanone, 9% xylene, 5.4% n-butanol, 4.4% triethylenetetramine (a curing agent), 9% graphite (a non-metallic conductive material), 10% mixed additives, and 17.1% permanent violet pigment.

[0113] The mixed additives include 6% siloxane, 14% ferrophosphorus powder, 10% titanium iron powder, 8% hematite powder, 24% cyclohexanone, and 38% n-butanol. The siloxane, ferrophosphorus powder, titanium iron powder, and hematite powder are in spherical form.

[0114] The epoxy powder in the intermediate layer comprises, by weight percentage, 45% epoxy resin (epoxy value 0.160 eq / 100g, softening point 95℃), 25% polyester resin (viscosity 6000 mPa·s, acid value 34 mg KOH / g), 2.4% accelerator aminophenol, 10% phenolic curing agent (969H06 type phenolic curing agent produced by Daqing Qinglu Langrun Technology Co., Ltd.), 2% degassing agent stearic acid, 2% leveling agent acrylate polymer, 5% composite filler boron nitride, 2% toughening agent methyl methacrylate-butadiene-styrene terpolymer, and 6.6% pigment filler phthalocyanine blue.

[0115] The epoxy powder in the surface layer comprises, by weight percentage, 35% epoxy resin (epoxy value 0.120 eq / 100g, softening point 100℃), 39% polyester resin (viscosity 5000 mPa·s, acid value 60 mg KOH / g), 1% antioxidant 2,6-tert-butyl-4-methylphenol, 0.5% leveling agent phosphate-modified acrylic acid, 0.5% defoamer TEGO-902W, and 2% toughening agent dibutyl phthalate, and 23% pigments and fillers mica powder and ultramarine.

[0116] Example 3 In this embodiment, the protective coating consists of an 11-micron bottom layer, a 41-micron intermediate layer, and a 41-micron top layer.

[0117] The base layer is formed using a primer. By weight percentage, the primer comprises 20% silicone acrylic modified epoxy resin, 10% zinc powder, 8% zinc phosphate (a rust-preventive pigment), 3% cyclohexanone, 7% xylene, 4% n-butanol, 10% polyamide 650 (a curing agent), 5% conductive mica (a non-metallic conductive material), 15% mixed additives, and 18% silica micropowder (a pigment and filler).

[0118] The mixed additives include 5% siloxane, 15% ferrophosphorus powder, 12% titanium iron powder, 6% hematite powder, 20% cyclohexanone, and 42% n-butanol. The siloxane, ferrophosphorus powder, titanium iron powder, and hematite powder are in flake form.

[0119] The epoxy powder in the intermediate layer comprises, by weight percentage, 25% polyester resin (viscosity 3000 mPa·s, acid value 76 mgKOH / g), 22% epoxy resin (epoxy value 0.165 eq / 100g, softening point 87℃), 0.1% colorless cobalt accelerator, 0.1% diphenylethanol ketone degassing agent, 1% phenolic curing agent (969H06 type phenolic curing agent produced by Daqing Qinglu Langrun Technology Co., Ltd.), 0.5% polyacrylic acid leveling agent, 30% boron nitride composite filler, 0.2% nano silica toughening agent, and 21.1% iron oxide red pigment filler.

[0120] The epoxy powder in the surface layer comprises, by weight percentage, 36% epoxy resin (epoxy value 0.090 eq / 100g, softening point 105℃), 30% polyester resin (viscosity 6000 mPa·s, acid value 76 mg KOH / g), 1% defoamer BYK-028, 3% toughening agent dimethyl phthalate, 1% leveling agent acrylate polymer, 2% antioxidant β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate octadecyl alcohol ester, and 27% pigment and filler ultramarine blue.

[0121] Example 4 In this embodiment, the protective coating consists of a 9-micrometer base layer, a 38-micrometer intermediate layer, and a 39-micrometer top layer.

[0122] The base layer is formed using a primer. By weight percentage, the primer includes: 18% dimer acid modified epoxy resin, 15% zinc powder, 10% rust-preventive pigment zinc oxide, 2% cyclohexanone, 6% xylene, 3% n-butanol, 8% curing agent isocyanate trimer, 2% non-metallic conductive material graphene, 20% mixed additives, and 16% pigment / filler permanent violet.

[0123] The mixed additives include 7% siloxane, 12% ferrophosphorus powder, 8% titanium iron powder, 10% hematite powder, 27% cyclohexanone, and 36% n-butanol. The siloxane, ferrophosphorus powder, titanium iron powder, and hematite powder are in spherical form.

[0124] The epoxy powder in the intermediate layer comprises, by weight percentage, 45% epoxy resin (epoxy value 0.090 eq / 100g, softening point 105℃), 25% polyester resin (viscosity 6000 mPa·s, acid value 76 mg KOH / g), 2.4% accelerator imidazoline, 3% phenolic curing agent (969H06 type phenolic curing agent produced by Daqing Qinglu Langrun Technology Co., Ltd.), 2% degassing agent stearic acid, 2% leveling agent acrylate polymer, 5% composite filler silica, and 2% toughening agent methyl methacrylate-butadiene-styrene terpolymer, and 13.6% pigment filler phthalocyanine green.

[0125] The epoxy powder in the surface layer comprises, by weight percentage, 28% epoxy resin (epoxy value 0.110eq / 100g, softening point 100℃), 47% polyester resin (viscosity 4500mPa·s, acid value 54mgKOH / g), 0.5% defoamer BYK-022, 2% toughening agent tributyl phosphate, 0.5% leveling agent phosphate-modified acrylic acid, 1% antioxidant 2,6-tert-butyl-4-methylphenol, and 21% pigments and fillers mica powder and ultramarine.

[0126] Example 5 The difference between Example 5 and Example 4 is that the thickness of the bottom layer is 12 micrometers, the thickness of the middle layer is 41 micrometers, and the thickness of the top layer is 41 micrometers. The materials of the bottom layer, the middle layer, and the top layer are all the same.

[0127] Example 6 In this embodiment, the protective coating consists of an 8-micrometer bottom layer, a 37-micrometer intermediate layer, and a 38-micrometer top layer.

[0128] The base layer is formed using a primer. By weight percentage, the primer comprises 13.75% low-polymerization modified epoxy resin, 20% zinc powder, 5.5% rust-preventive pigment alumina, 1.65% cyclohexanone, 9% xylene, 1.65% n-butanol, 18% curing agent isocyanate trimer, 0.275% non-metallic conductive material graphene, 25% mixed additives, and 5.175% pigment and filler titanium dioxide.

[0129] The mixed additives include 6% siloxane, 14% ferrophosphorus powder, 13% titanium iron powder, 5% hematite powder, 20% cyclohexanone, and 42% n-butanol. The siloxane, ferrophosphorus powder, titanium iron powder, and hematite powder are available in both flake and spherical forms.

[0130] The epoxy powder in the intermediate layer comprises, by weight percentage, 22% epoxy resin (epoxy value 0.165eq / 100g, softening point 87℃), 25% polyester resin (acid value 38mgKOH / g, viscosity 3000mPa·s), 1% phenolic curing agent (969H06 type phenolic curing agent produced by Daqing Qinglu Langrun Technology Co., Ltd.), 0.1% accelerator methyl diethanolamine, 0.5% leveling agent polyacrylic acid, 0.1% degassing agent diphenylethanol ketone, 30% composite filler boron nitride, 0.2% toughening agent nano silica, and 21.1% pigment filler iron oxide red.

[0131] The surface layer polyester powder comprises 22% ultra-weather-resistant polyester resin with a hydroxyl value of 120 mg KOH / g and a viscosity of 4200 mPa·s, 45% high-weather-resistant polyester resin with an acid value of 29 mg KOH / g and a viscosity of 4500 mPa·s, 2.7% curing agent TGIC, 0.5% curing agent HAA, 1.5% leveling agent polyether polyester modified organosiloxane, 0.5% toughening agent tributyl phosphate, 14% curing agent BF1320, 0.1% accelerator methyl diethanolamine, 0.1% defoamer TEGO-902W, 0.2% BASF antioxidant 1010, 11% composite filler boron nitride, and 2.9% pigment filler phthalocyanine blue.

[0132] Example 7 In this embodiment, the protective coating consists of a 10-micron bottom layer, a 40-micron intermediate layer, and a 40-micron top layer.

[0133] The base layer is formed using a primer. By weight percentage, the primer comprises 27% acrylic-modified epoxy resin, 0.1% zinc powder, 13.5% zinc molybdate (a rust-preventive pigment), 4.5% cyclohexanone, 9% xylene, 5.4% n-butanol, 4.4% triethylenetetramine (a curing agent), 9% graphite (a non-metallic conductive material), 10% mixed additives, and 17.1% permanent violet pigment.

[0134] The mixed additives include 6% siloxane, 14% ferrophosphorus powder, 10% titanium iron powder, 10% hematite powder, 26% cyclohexanone, and 34% n-butanol. The siloxane, ferrophosphorus powder, titanium iron powder, and hematite powder are in flake form.

[0135] The intermediate layer epoxy powder comprises, by weight percentage, 40% epoxy resin (epoxy value 0.120eq / 100g, softening point 102 ℃), 30% polyester resin (acid value 70 mgKOH / g, viscosity 4500mPB·s), 3% phenolic curing agent (969H06 type phenolic curing agent produced by Daqing Qinglu Langrun Technology Co., Ltd.), 1% accelerator 2,4,6-tris(dimethylaminomethyl)phenol, 1% leveling agent fluorinated acrylic acid, 0.5% degassing agent diphenylethanol ketone, 0.5% degassing agent stearic acid, 15% composite filler alumina, 1% toughening agent diethyl phthalate, and 6% pigment filler phthalocyanine blue.

[0136] The surface layer polyester powder comprises 22% ultra-weather-resistant polyester resin with a hydroxyl value of 100 mg KOH / g and a viscosity of 3200 mPa·s, 30% high-weather-resistant polyester resin with an acid value of 31 mg KOH / g and a viscosity of 5200 mPa·s, 3.5% curing agent TGIC, 14% curing agent BF1320, 0.5% leveling agent polyether polyester modified organosiloxane, 0.1% accelerator methyl diethanolamine, 0.1% BYK-022 defoamer from BYK Chemicals, 0.5% toughening agent dimethyl phthalate, 0.2% antioxidant 2,6-tributyl-4-methylphenol, 25% composite filler boron nitride, and 4.1% pigment filler phthalocyanine blue.

[0137] Example 8 In this embodiment, the protective coating consists of an 11-micron bottom layer, a 41-micron intermediate layer, and a 41-micron top layer.

[0138] The base layer is formed using a primer. By weight percentage, the primer comprises 20% silicone acrylic modified epoxy resin, 10% zinc powder, 8% zinc phosphate (a rust-preventive pigment), 3% cyclohexanone, 7% xylene, 4% n-butanol, 10% polyamide 650 (a curing agent), 5% conductive mica (a non-metallic conductive material), 15% mixed additives, and 18% silica micropowder (a pigment and filler).

[0139] The mixed additives include 6% siloxane, 14% ferrophosphorus powder, 10% titanium iron powder, 8% hematite powder, 24% cyclohexanone, and 38% n-butanol. The siloxane, ferrophosphorus powder, titanium iron powder, and hematite powder are in flake form.

[0140] The epoxy powder in the intermediate layer comprises, by weight percentage, 45% epoxy resin (epoxy value 0.160 eq / 100g, softening point 95℃), 25% polyester resin (acid value 34mgKOH / g, viscosity 6000mPa·s), 10% phenolic curing agent (969H06 type phenolic curing agent produced by Daqing Qinglu Langrun Technology Co., Ltd.), 2.4% accelerator aminophenol, 2% leveling agent acrylate polymer, 2% degassing agent stearic acid, 5% composite filler boron nitride, 2% toughening agent methyl methacrylate-butadiene-styrene terpolymer, and 6.6% pigment filler phthalocyanine blue.

[0141] The surface layer polyester powder comprises 35% ultra-weather-resistant polyester resin with a hydroxyl value of 110 mg KOH / g and a viscosity of 3800 mPa·s, 32% high-weather-resistant polyester resin with an acid value of 32 mg KOH / g and a viscosity of 5000 mPa·s, 2.3% curing agent TGIC, 24% curing agent B1540, 0.5% leveling agent polyether polyester modified organosiloxane, 0.1% accelerator methyl diethanolamine, 0.1% BYK-022 defoamer from BYK Chemicals, 0.5% toughening agent dimethyl phthalate, 0.2% antioxidant 2,6-tributyl-4-methylphenol, 3% composite filler silica, and 2.3% pigment filler phthalocyanine blue.

[0142] Example 9 In this embodiment, the protective coating consists of a 9-micrometer bottom layer, a 38-micrometer intermediate layer, and a 39-micrometer top layer.

[0143] The base layer is formed using a primer. By weight percentage, the primer includes: 18% dimer acid modified epoxy resin, 15% zinc powder, 10% rust-preventive pigment zinc oxide, 2% cyclohexanone, 6% xylene, 3% n-butanol, 8% curing agent isocyanate trimer, 2% non-metallic conductive material graphene, 20% mixed additives, and 16% pigment / filler permanent violet.

[0144] The mixed additives include 6% siloxane, 14% ferrophosphorus powder, 10% titanium iron powder, 10% hematite powder, 25% cyclohexanone, and 35% n-butanol. The siloxane, ferrophosphorus powder, titanium iron powder, and hematite powder are in flake form.

[0145] The epoxy powder in the intermediate layer comprises, by weight percentage, 26% epoxy resin (epoxy value 0.165eq / 100g, softening point 87℃), 50% polyester resin (acid value 34mgKOH / g, viscosity 3000mPa·s), 2% phenolic curing agent (969H06 type phenolic curing agent produced by Daqing Qinglu Langrun Technology Co., Ltd.), 0.1% accelerator methyl diethanolamine, 0.5% leveling agent polyacrylic acid, 0.1% degassing agent diphenylethanol ketone, 5% composite filler silica, and 0.2% toughening agent nano silica, and 16.1% pigment filler iron oxide red.

[0146] The surface layer polyester powder comprises 32% ultra-weather-resistant polyester resin with a hydroxyl value of 100 mg KOH / g and a viscosity of 3200 mPa·s, 30% high-weather-resistant polyester resin with an acid value of 32 mg KOH / g and a viscosity of 5000 mPa·s, 0.5% leveling agent polyether polyester modified organosiloxane, 2.3% curing agent TGIC, 24% curing agent B1400, 0.1% accelerator methyl diethanolamine, 0.5% toughening agent dimethyl phthalate, 0.1% BYK Chemical's BYK-022 defoamer, 0.2% antioxidant 2,6-tributyl-4-methylphenol, 5% composite filler boron nitride, and 5.3% pigment filler phthalocyanine blue.

[0147] Example 10 The difference between Example 10 and Example 9 is that the thickness of the bottom layer is 12 micrometers, the thickness of the middle layer is 41 micrometers, and the thickness of the top layer is 41 micrometers. The materials of the bottom layer, the middle layer, and the top layer are all the same.

[0148] Comparative Example 1 The protective coating consists of a 10-micron base layer, a 40-micron intermediate layer, and a 40-micron top layer.

[0149] The base coat is an oil-based epoxy zinc-rich primer (DWB ZINC 30) from Jiangsu Dewei Coatings Co., Ltd.

[0150] The epoxy powder in the intermediate layer comprises, by weight percentage, 30% polyester resin (acid value 70 mg KOH / g, viscosity 4500 mPa·s), 40% epoxy resin (epoxy value 0.120 eq / 100g, softening point 102℃), 3% phenolic curing agent, 1% accelerator 2,4,6-tris(dimethylaminomethyl)phenol, 1% leveling agent fluorinated acrylic acid, 0.5% degassing agent diphenylethanol ketone, 0.5% degassing agent stearic acid, 15% composite filler alumina, 1% toughening agent diethyl phthalate, and 6% pigment filler phthalocyanine blue.

[0151] The epoxy powder in the surface layer comprises, by weight percentage, 45% polyester resin (acid value 54 mg KOH / g, viscosity 4500 mPa·s), 30% epoxy resin (epoxy value 0.110 eq / 100g, softening point 100℃), 0.5% leveling agent phosphate-modified acrylic, 0.5% defoamer BYK-024, 1% antioxidant 2,6-tributyl-4-methylphenol, and 2% toughening agent dibutyl phthalate, and 21% pigments and fillers mica powder and ultramarine.

[0152] Comparative Example 2 The protective coating consists of a 10-micron base layer, a 40-micron intermediate layer, and a 40-micron top layer.

[0153] The base coat is an oil-based epoxy zinc-rich primer (DWB ZINC 30) from Jiangsu Dewei Coatings Co., Ltd.

[0154] The epoxy powder in the intermediate layer comprises, by weight percentage, 30% polyester resin (acid value 70 mg KOH / g, viscosity 4500 mPB·s), 40% epoxy resin (epoxy value 0.120 eq / 100g, softening point 102℃), 3% phenolic curing agent (969H06 type phenolic curing agent produced by Daqing Qinglu Langrun Technology Co., Ltd.), 1% accelerator 2,4,6-tris(dimethylaminomethyl)phenol, 1% leveling agent fluorinated acrylic acid, 0.5% degassing agent diphenylethanol ketone, 0.5% degassing agent stearic acid, 15% composite filler alumina, 1% toughening agent diethyl phthalate, and 6% pigment filler phthalocyanine blue.

[0155] The surface layer polyester powder comprises 45% high weather-resistant polyester resin with an acid value of 29 mg KOH / g and a viscosity of 4500 mPa·s, 22% ultra-weather-resistant polyester resin with a hydroxyl value of 120 mg KOH / g and a viscosity of 4200 mPa·s, 3.5% curing agent TGIC, 14% curing agent B1400, 1.5% leveling agent polyether polyester modified organosiloxane, 0.1% accelerator methyl diethanolamine, 0.1% defoamer TEGO-902W, 0.5% toughening agent tributyl phosphate, 0.2% BASF antioxidant 1010, 11% composite filler boron nitride, and 2.6% pigment filler phthalocyanine blue.

[0156] Comparative Example 3 The protective coating consists of a 10-micron base layer, a 20-micron intermediate layer, and a 50-micron top layer.

[0157] The base layer uses a zinc-rich primer, specifically DWep ZINC500 from Jiangsu Dewei Coatings Co., Ltd.

[0158] The intermediate layer uses water-based epoxy zinc-rich paint, specifically DWBAC PRIMER from Jiangsu Dewei Coatings Co., Ltd.

[0159] The topcoat is a paint, specifically DWB AC INTERIOR from Jiangsu Dewei Coatings Co., Ltd.

[0160] Comparative Example 4 The protective coating consists of a 10-micron base layer, a 20-micron intermediate layer, a 50-micron third layer, and a 40-micron top layer.

[0161] The base layer uses a zinc-rich primer, specifically DWep ZINC500 from Jiangsu Dewei Coatings Co., Ltd.

[0162] The intermediate layer uses water-based epoxy zinc-rich paint, specifically DWBAC PRIMER from Jiangsu Dewei Coatings Co., Ltd.

[0163] The third layer uses DWB AC PRIMER from Jiangsu Dewei Coatings Co., Ltd.

[0164] The topcoat is made of polyurethane paint, specifically DWpu FINISH20 from Jiangsu Dewei Coatings Co., Ltd.

[0165] Comparative Example 5 In this embodiment, the protective coating consists of a 9-micrometer base layer, a 38-micrometer intermediate layer, and a 39-micrometer top layer.

[0166] The base layer is formed using a zinc-free primer. By weight percentage, the zinc-free primer includes: 25% isocyanate-modified epoxy resin, 15% rust-preventive pigment aluminum tripolyphosphate, 5% cyclohexanone, 10% xylene, 6% n-butanol, 8% curing agent-modified polyamide, 10% non-metallic conductive material graphite, and 21% pigment and filler titanium dioxide.

[0167] The epoxy powder in the intermediate layer comprises, by weight percentage, 45% epoxy resin (epoxy value 0.090 eq / 100g, softening point 105℃), 25% polyester resin (viscosity 6000 mPa·s, acid value 76 mg KOH / g), 2.4% accelerator imidazoline, 3% phenolic curing agent (969H06 type phenolic curing agent produced by Daqing Qinglu Langrun Technology Co., Ltd.), 2% degassing agent stearic acid, 2% leveling agent acrylate polymer, 5% composite filler silica, and 2% toughening agent methyl methacrylate-butadiene-styrene terpolymer, and 13.6% pigment filler phthalocyanine green.

[0168] The epoxy powder in the surface layer comprises, by weight percentage, 28% epoxy resin (epoxy value 0.110eq / 100g, softening point 100℃), 47% polyester resin (viscosity 4500mPa·s, acid value 54mgKOH / g), 0.5% defoamer BYK-022, 2% toughening agent tributyl phosphate, 0.5% leveling agent phosphate-modified acrylic acid, 1% antioxidant 2,6-tert-butyl-4-methylphenol, and 21% pigments and fillers mica powder and ultramarine.

[0169] Experimental methods and results: The erosion performance of the samples from the examples and comparative examples was tested. The specific testing method was as follows: Using cold-rolled steel sheets of the same material, thickness, and size, and employing the construction process described in this application, samples were prepared under the same conditions using the protective coatings of Examples 1-10 and Comparative Examples 1-4, respectively.

[0170] Create identical T-shaped lines on each sample. The specific method for creating the T-shaped lines is as follows: T-shaped lines are drawn on the template using a blade to cut lines to the bottom. The lengths of the T-shaped lines are 50mm and 76mm respectively.

[0171] Samples from Examples 1-10 and Comparative Examples 1-4 were placed simultaneously in the same salt spray test chamber and removed after 1000 hours. The test chamber contained: a 5% sodium chloride solution; a chamber temperature of (35±2)℃; and a pH of 6.5–7.2 (25℃).

[0172] The result is as follows Figure 1-4As shown in Table 1, the test results of its corrosion diffusion performance are obtained by measurement, and the corrosion width is taken as its average width.

[0173] Table 1

[0174] The test results show that the corrosion resistance of this invention is significantly superior to that of existing technologies. Specifically, not only is the thickness of this invention significantly lower than that of existing coatings, but its corrosion resistance is also significantly better. In particular, its corrosion resistance is significantly superior to that of existing technologies.

[0175] The corrosion resistance of the zinc-containing primer in Example 4 and the zinc-free primer in Comparative Example 5 was compared. Specifically, the zinc-containing primer in Example 4 and the zinc-free primer in Comparative Example 5 were applied to steel using the same process conditions and with consistent coating thickness. After curing, the steel was observed at 25 ± 3 degrees Celsius and 75% humidity. The following results were obtained: the zinc-free primer showed no rust spots or other defects at 3, 7, and 14 days, but slight rust spots appeared on the surface at 28 days, with no other defects. (See attached reference for details.) Figure 4 and Figure 5 ,in Figure 5 The circled areas indicate rust spots. The zinc-containing primer in Example 4 showed no rust spots or other defects on the surface not only at 3, 7, and 14 days, but also on day 28. See sections 2 and 3 for details. Figure 3 Therefore, when zinc-containing primers and other primers are applied to the substrate for temporary protection, the zinc-containing primer of Example 4 has a better anti-corrosion effect than the zinc-free primer. Furthermore, when the zinc-containing primer and the zinc-free primer of Example 4 are applied to a complete protective coating, the anti-corrosion performance of the two protective coatings is basically the same.

[0176] Therefore, the zinc-containing primer in this application not only has anti-corrosion effect when used as temporary protection, but also has good anti-corrosion effect throughout the entire protective coating.

[0177] Although the invention has been described with reference to several typical embodiments, it should be understood that the terminology used is illustrative and exemplary, and not restrictive. Since the invention can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims. Therefore, all variations and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A protective coating for engineering equipment, characterized in that, It includes a base layer, an intermediate layer and a top layer arranged in sequence; the base layer is attached to the engineering equipment, the material of the base layer is a primer containing 0.1% to 20% zinc by mass percentage, the material of the intermediate layer is epoxy powder, and the material of the top layer is epoxy powder or polyester powder.

2. The protective coating for engineering equipment according to claim 1, wherein the primer is a high-solids oil-based paint, and the solids content of the high-solids oil-based paint is not less than 60%.

3. The protective coating for engineering equipment according to claim 1, characterized in that, By weight percentage, the primer comprises 13.75-27% modified epoxy resin, 0.1-20% zinc powder, 5.5-13.5% anti-rust pigment, 1.65-4.5% cyclohexanone, 4.4-9% xylene, 1.65-5.4% n-butanol, 4.4-18% curing agent, 0.275-9% non-metallic conductive material, and 10-25% mixed additives, with the remainder being pigments and fillers; The mixed additives, by mass percentage, include 5-7% siloxane, 12-15% iron-phosphorus powder, 8-12% iron-titanium powder, 5-10% hematite powder, 20-27% cyclohexanone, and 34-42% n-butanol, wherein the siloxane, iron-phosphorus powder, iron-titanium powder, and hematite powder are all in flake and / or spherical form.

4. The primer for industrial metal surfaces according to claim 1, characterized in that, The siloxane, the ferrophosphorus powder, the ferrotitanium powder, the hematite powder, the cyclohexanone, and the n-butanol are mixed and stirred at a speed of 1500-1750 r / min for 1-1.5 hours, and then stirred at 200-300 r / min and 70-85°C for 1-2 hours to obtain the mixed additive.

5. The primer for industrial metal surfaces according to claim 1, characterized in that, The non-metallic conductive material includes at least one of graphite, graphene, and conductive mica.

6. The protective coating for engineering equipment according to claim 1, characterized in that, The thickness of the bottom layer is less than the thickness of the middle layer, and the thickness of the bottom layer is less than the thickness of the top layer.

7. The protective coating for engineering equipment according to claim 1, characterized in that, According to the mass percentage, the epoxy powder of the intermediate layer comprises: 22-45% epoxy resin, 25-50% polyester resin, 0.1-2.4% accelerator, 1-10% phenolic curing agent, 0.1-2% degassing agent, 0.5-2% leveling agent, 0.2-2% toughening agent, and 5-30% composite filler, with the remainder being pigments and fillers.

8. The protective coating for engineering equipment according to claim 6, characterized in that, The epoxy resin has an epoxy value of 0.090~0.165 eq / 100g and a softening point of 87~105℃; and / or, The viscosity of the polyester resin is 3000~6000 mPa·s, and the acid value is 34~76 mgKOH / g.

9. The protective coating for engineering equipment according to claim 1, characterized in that, When the surface layer is made of epoxy powder, the surface layer is located inside the engineering equipment; According to mass percentage, the epoxy powder of the surface layer comprises 20-36% epoxy resin, 30-60% polyester resin, 0.1-1% defoamer, 0.5-3% toughening agent, 0.5-1% leveling agent and 0.2-2% antioxidant, with the remainder being pigments and fillers.

10. The protective coating for engineering equipment according to claim 8, characterized in that, The epoxy resin has a softening point of 87~105℃ and an epoxy value of 0.090~0.165eq / 100g; and / or, The viscosity of the polyester resin is 3000~6000 mPa·s, and the acid value is 34~76 mgKOH / g.

11. The protective coating for engineering equipment according to claim 1, characterized in that, When the surface layer is made of polyester powder, the surface layer is located outside the engineering equipment; According to the mass percentage, the polyester powder comprises 22-35% ultra-weather-resistant polyester resin, 30-45% high-weather-resistant polyester resin, 0-2.5% hydroxyalkylamide, 0.5-1.5% leveling agent, 0-3.5% triglycidyl isocyanate, 14-24% blocked polyisocyanate, 0.1-1% defoamer, 0.1-3% accelerator, 2-25% composite filler, 0.2-2% antioxidant, and 0.5-3.2% toughening agent, with the remainder being pigments and fillers; The ultra-weather-resistant polyester has a viscosity of 3200~4200 mPa·s and a hydroxyl value of 100~120 mgKOH / g; And / or, The high weather-resistant polyester has a viscosity of 4500~6000 mPa·s and an acid value of 29~34 mgKOH / g.

12. A primer for industrial metal surfaces, characterized in that, By weight percentage, the primer comprises 13.75-27% modified epoxy resin, 0.1-20% zinc powder, 5.5-13.5% anti-rust pigment, 1.65-4.5% cyclohexanone, 4.4-9% xylene, 1.65-5.4% n-butanol, 4.4-18% curing agent, 0.275-9% non-metallic conductive material, and 10-25% mixed additives, with the remainder being pigments and fillers; The mixed additives, by mass percentage, include 5-7% siloxane, 12-15% iron-phosphorus powder, 8-12% iron-titanium powder, 5-10% hematite powder, 20-27% cyclohexanone, and 34-42% n-butanol, wherein the siloxane, iron-phosphorus powder, iron-titanium powder, and hematite powder are all in flake and / or spherical form.

13. A container, characterized in that, It includes a housing and a protective coating disposed on the peripheral sidewall of the housing, wherein the protective coating is the protective coating for engineering equipment as described in any one of claims 1-11.

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