Plastic spraying process for high-wear-resistance compact coating of showing stand

Abstract

The invention relates to a plastic spraying process for a high-wear-resistance compact coating of a showing stand, and relates to the technical field of showing stand surface treatment. A cold-rolled steel sheet is selected and sequentially subjected to oil removal, rust removal, phosphorization, water washing and drying treatment; the bottom layer modified epoxy resin spraying powder is evenly sprayed on the surface of the pretreated base material in an electrostatic spraying mode, and then curing is conducted; uniformly spraying the surface layer modified polyester plastic spraying powder on the surface of the bottom layer coating by adopting an electrostatic plastic spraying mode, and curing; the surface of the coating is slightly polished and subjected to high-pressure dust removal, and the metal showing stand with the high-wear-resistance compact coating is obtained; the wear resistance, the corrosion resistance, the adhesive force and the collision resistance of the prepared showing stand coating are improved, and the comprehensive performance of the coating is excellent.

Description

Technical Field

[0001] This invention relates to the field of surface treatment technology for display racks, and in particular to a high wear-resistant and dense coating powder coating process for display racks. Background Technology

[0002] Metal display racks are widely used in shopping malls, supermarkets, specialty stores, and showrooms for displaying various products due to their sturdy structure, high load-bearing capacity, and flexible design. However, during use, metal display racks are constantly exposed to air and moisture, and are frequently subjected to friction and bumps during product handling, as well as corrosion from external dust and corrosive gases. This causes problems such as wear, peeling, and rusting of the surface coating, which not only affect the aesthetic appearance of the display rack and reduce the overall quality of the product display, but also shorten the lifespan of the display rack and increase the user's replacement and maintenance costs.

[0003] Chinese Patent CN108510904A discloses a home design display device, including bottom movable rollers, a bottom fixed base, a drawing scanner, and a drawing placement slot. A roller fixing frame is installed above the bottom movable rollers, and an adjusting hydraulic cylinder is provided above the bottom fixed base. The drawing scanner is connected to the top of the display platform body, an image converter is installed below the drawing scanner, an LCD screen is installed below the image converter, a design drawing display rack is connected below the LCD screen, the drawing placement slot is installed above the design drawing display rack, an operation control box is installed below the drawing placement slot, control buttons are installed above the operation control box, and a magnetic fixing head is installed above the design drawing display rack.

[0004] Chinese Patent CN121003360A: This invention relates to a double-sided display rack, specifically to the technical field of commodity display equipment. It includes a base and a display mechanism. The display mechanism includes a support plate, an insert plate on the outer wall of the support plate, a top surface fixing plate fixedly connected to the top outer wall of the support plate, and shelves and hanging rods detachably mounted on the top outer wall of the support plate. A top surface connecting frame is provided on the top outer wall of the top surface fixing plate, and a top surface frame A is fixedly connected to the outer wall of the top surface connecting frame. A top surface frame B is detachably mounted on the outer wall of the top surface frame A.

[0005] The existing surface anti-corrosion treatment of metal display racks uses a powder coating process, which has the following drawbacks: the coating has poor wear resistance; the coating is prone to pores, allowing moisture and corrosive media to easily penetrate to the surface of the metal substrate, leading to substrate corrosion and subsequent coating peeling; the coating has insufficient adhesion to the substrate, and the coating thickness is uneven, making it prone to defects such as orange peel and bubbles; it is difficult to adapt to the use scenarios of frequent friction and long-term exposure of display racks. Summary of the Invention

[0006] To address the aforementioned problems, this invention provides a highly wear-resistant and dense powder coating process for display racks, the operation steps of which are as follows: S1 substrate pretreatment: Select 2.0mm thick cold-rolled steel plate and perform degreasing, rust removal, phosphating, water washing and drying in sequence; S2 Undercoat Powder Coating: Modified epoxy resin powder is evenly sprayed onto the pretreated substrate surface using electrostatic powder coating to form an undercoat. Spraying parameters are: spray gun voltage 65-75kV, spray gun distance to substrate 180-220mm, powder application rate 90-110kg / min, spraying pressure 0.4-0.6MPa; undercoat thickness is 30-40μm. S3 Base Layer Curing: The sprayed substrate is placed in a curing oven for staged heating and curing. The first stage is heated to 120-130℃ and held for 6-12 minutes; the second stage is heated to 160-170℃ and held for 15-25 minutes; the third stage is heated to 175-185℃ and held for 10-20 minutes. After curing, the substrate is cooled to room temperature at a rate of 5-8℃ / min. S4 Topcoat Powder Coating: Electrostatic powder coating is used to evenly spray modified polyester powder onto the surface of the base coating to form the topcoat. Spraying parameters are: spray gun voltage 70-80kV, spray gun distance from substrate 190-210mm, powder application rate 100-120kg / min, spraying pressure 0.45-0.55MPa; topcoat thickness is controlled at 40-50μm. S5 Three-Stage Curing: The substrate after topcoat spraying is sent back into the curing oven for staged temperature-increase curing. The first stage is heated to 130-140℃ and held for 6-12 minutes; the second stage is heated to 170-180℃ and held for 20-30 minutes; the third stage is heated to 185-195℃ and held for 10-20 minutes; forced air cooling is then applied to 35℃ at a cooling rate of 5-7℃ / min. S6 Post-processing: The coated surface is lightly sanded with 900-grit sandpaper to remove burrs and protrusions. Then, 0.35MPa high-pressure dust removal is performed to remove defective products such as damaged coatings, missed sprays, bubbles, and orange peel, resulting in a metal display rack with a highly wear-resistant and dense coating.

[0007] Optionally, the S1 degreasing agent uses an alkaline degreasing agent; by mass, the alkaline degreasing agent consists of 2-6 parts sodium hydroxide, 6-12 parts sodium carbonate, 1-4 parts sodium silicate, 0.5-3 parts fatty alcohol polyoxyethylene ether, and 55-75 parts water; the degreasing temperature is 55-65℃, and the time is 15-25 minutes.

[0008] Optionally, the S1 rust removal is performed by shot blasting with a shot blasting strength of 0.18-0.22 MPa and a treatment time of 8-12 minutes.

[0009] Optionally, the S1 phosphating uses a zinc-based phosphating solution; by mass, the zinc-based phosphating solution consists of 15-25 parts zinc dihydrogen phosphate, 6-12 parts zinc nitrate, 0.3-1.5 parts sodium nitrite accelerator, 1-3 parts sodium citrate complexing agent, and 40-50 parts water; the phosphating temperature is 35-45℃, and the treatment time is 8-12 minutes.

[0010] Optionally, the S1 water washing temperature is 35-45℃, and the water washing time is 5-15 minutes.

[0011] Optionally, the drying temperature of S1 is 110-130℃, and the drying time is 20-30 minutes.

[0012] Optionally, the S2 base layer modified epoxy resin powder coating consists of 55-75 parts by weight of bisphenol A type epoxy resin, 6-12 parts of diethylenetriamine curing agent, 0.5-2.5 parts of nano SiO2 particles, 1-5 parts of rust inhibitor, 0.5-2 parts of polyether modified organosilicon leveling agent, and 0.5-2 parts of silane coupling agent.

[0013] Optionally, the rust inhibitor is a compound of zinc phosphate and aluminum tripolyphosphate in a mass ratio of 1:1.

[0014] Optionally, the surface-modified polyester powder coating of S4 is composed of 60-80 parts polyester resin, 5-10 parts isocyanate curing agent, 1-5 parts wear-resistant montmorillonite, 2-6 parts polytetrafluoroethylene micro powder, 0.1-0.5 parts benzotriazole ultraviolet absorber, and 0.5-2 parts silicone leveling agent by weight.

[0015] Optionally, the preparation method of the wear-resistant montmorillonite is as follows, according to parts by mass: A1: Add 130-160 parts of sodium-based montmorillonite to 1200-1300 parts of deionized water, and stir and disperse at 80-90℃ and 500-600 rpm for 30-40 minutes to obtain an aqueous dispersion of montmorillonite; add 8-15 parts of hexadecyl dimethyl allyl ammonium chloride to adjust the pH of the system to 7-8, and stir at 85-95℃ for 2-4 hours to complete the intercalation reaction; after the reaction, filter, wash the filter cake with deionized water until there are no chloride ions, dry it at 100-110℃ to constant weight, and grind it through a 200-300 mesh sieve to obtain intercalated modified montmorillonite; A2: Add intercalated modified montmorillonite, 1.3-3.8 parts zirconium aminophthalate, 0.5-2 parts diethylamine, and 2-5 parts allyl-terminated polyethylene glycol to a high-speed mixer, heat to 80-90℃, and stir for 10-30 minutes; dry the material at 90-100℃ and a vacuum of -0.08 to -0.1 MPa for 100-150 minutes to obtain wear-resistant montmorillonite.

[0016] Reaction mechanism: The core of this process revolves around substrate interface bonding, cross-linking and curing of the powder coating, and overall densification of the coating. The phosphate film formed by substrate pretreatment forms an interface bond with the metal substrate, creating a stable base for subsequent coating adhesion. During the curing process, the modified epoxy resin powder coating at the bottom layer undergoes a cross-linking reaction with the curing agent to form a three-dimensional network structure, in which nanofillers and anti-rust components are uniformly dispersed. The silane coupling agent achieves effective bonding between the fillers and the resin matrix, reducing the internal porosity of the bottom layer coating. After curing, the modified polyester powder coating at the top layer forms a dense polymer network. The wear-resistant montmorillonite modified with novel monomer intercalation achieves interfacial compatibility and bonding with the polyester resin. The wear-resistant components are embedded in the network to improve the wear resistance of the top layer. At the same time, a tight interface bond is formed between the two coating layers. The segmented temperature curing process effectively alleviates the internal stress during the coating curing process and avoids the generation of microcracks, ultimately forming a dense double-layer coating system with tight interlayer bonding.

[0017] Technical effects: The present invention provides a highly wear-resistant and dense powder coating process for display racks. Compared with the prior art, the present invention has the following significant advantages: 1. This invention adopts a double-layer powder coating structure with a base layer and a top layer. The base layer uses modified epoxy resin powder coating to enhance rust and corrosion resistance and the adhesion between the coating and the substrate. The top layer uses modified polyester powder coating, in which zirconium aminophthalate undergoes an addition reaction with allyl groups to achieve a strong bond between wear-resistant montmorillonite and polyester resin, significantly improving the structural density and wear resistance of the top layer. The two coatings each perform their respective functions and work synergistically. At the same time, the modified components such as nano-SiO2 added to the powder coating fill the pores of the coating, achieving a comprehensive improvement in the wear resistance and corrosion resistance of the coating. The overall comprehensive performance of the coating is excellent.

[0018] 2. The substrate pretreatment process, including degreasing, shot blasting, rust removal, phosphating, washing, and drying, improves the cleanliness and roughness of the substrate surface. The resulting phosphating film enhances the adhesion between the coating and the substrate. The segmented heating and curing process avoids stress within the coating, improving the curing effect and adhesion of the coating. Combined with the strong internal bonding of the coating resulting from the addition reaction, this further extends the service life of the display rack.

[0019] 3. The coating forms a stable molecular bond structure due to the addition reaction of zirconium aminophthalate and allyl groups, which has excellent wear resistance and impact resistance. It can effectively resist friction and impact during the use of the display rack, keep the appearance intact, and is highly practical, which can fully meet the long-term and high-frequency use needs of shopping malls, supermarkets and other places. Detailed Implementation

[0020] To further illustrate the technical means and effects adopted by the present invention to achieve the intended purpose, the following detailed description is provided in conjunction with embodiments and comparative examples: 1. Adhesion test: The test shall be conducted in accordance with kgB / T9286-1998 "Determination of adhesion of paint and varnish film by cross-cut test"; the adhesion grade is divided into 0-5, with grade 0 being the best (no coating peeling off), grade 5 being the worst (large area of ​​coating peeling off), and grade 0 being qualified.

[0021] 2. Abrasion resistance test: The test shall be conducted in accordance with kgB / T1768-2006 "Determination of abrasion resistance of paints and varnishes by rotating rubber grinding wheel method".

[0022] 3. Rust and corrosion resistance test: Refer to kgB / T1771-2007 "Determination of resistance to neutral salt spray of paints and varnishes" to conduct a neutral salt spray test. Observe the surface condition of the coating after 1000 hours and record whether there are phenomena such as rust, blistering, or peeling. No red rust after 1000 hours is considered qualified.

[0023] 4. Impact resistance test: The test shall be conducted in accordance with GB / T1732-1993 "Determination of impact resistance of paint film". Observe whether the coating cracks or peels off. No cracks or peels off are considered qualified. Example 1

[0024] A high-wear-resistant and dense powder coating process for display racks, the operation steps of which are as follows: S1 substrate pretreatment: Select 2.0mm thick cold-rolled steel plate and perform degreasing, rust removal, phosphating, water washing and drying in sequence; S2 Base Coating: Electrostatic powder coating is used to uniformly spray modified epoxy resin powder onto the pretreated substrate surface; the spraying parameters are: spray gun voltage 65kV, spray gun distance from substrate 180mm, powder spraying rate 90kg / min, spraying pressure 0.4MPa; the base coating thickness is 30μm. S3 Base Layer Curing: The sprayed substrate is placed in a curing oven and cured in stages. The first stage is heated to 120°C and held for 6 minutes; the second stage is heated to 160°C and held for 15 minutes; the third stage is heated to 175°C and held for 10 minutes; after curing, it is cooled to room temperature at a rate of 5°C / min. S4 Topcoat Powder Coating: Electrostatic powder coating is used to uniformly spray modified polyester powder coating powder onto the surface of the base coating. The spraying parameters are: spray gun voltage 70kV, distance between spray gun and substrate 190mm, powder spraying rate 100kg / min, spraying pressure 0.45MPa; the topcoat thickness is controlled at 40μm. S5 Three-Stage Curing: The substrate after topcoat spraying is sent back into the curing oven for staged temperature-increase curing. The first stage is heated to 130℃ and held for 6 minutes; the second stage is heated to 170℃ and held for 20 minutes; the third stage is heated to 185℃ and held for 10 minutes; forced air cooling is then applied to 35℃ at a cooling rate of 5℃ / min. S6 Post-processing: The coated surface is lightly sanded with 900-grit sandpaper to remove burrs and protrusions. Then, 0.35MPa high-pressure dust removal is performed to remove defective products such as damaged coatings, missed sprays, bubbles, and orange peel, resulting in a metal display rack with a highly wear-resistant and dense coating.

[0025] The S1 degreasing process uses an alkaline degreasing agent; the alkaline degreasing agent consists of 2 kg sodium hydroxide, 6 kg sodium carbonate, 1 kg sodium silicate, 0.5 kg fatty alcohol polyoxyethylene ether AEO-9, and 55 kg water; the degreasing temperature is 55℃ and the time is 15 min.

[0026] The S1 rust removal process employs shot blasting with a shot blasting strength of 0.18 MPa and a treatment time of 8 minutes.

[0027] The S1 phosphating uses a zinc-based phosphating solution; the zinc-based phosphating solution consists of 15 kg zinc dihydrogen phosphate, 6 kg zinc nitrate, 0.3 kg sodium nitrite accelerator, 1 kg sodium citrate complexing agent, and 40 kg water; the phosphating temperature is 35℃ and the treatment time is 8 min.

[0028] The S1 water washing temperature is 35℃, and the water washing time is 5 minutes.

[0029] The drying temperature of S1 is 110℃ and the drying time is 20min.

[0030] The S2 base modified epoxy resin powder coating consists of 55 kg of bisphenol A type epoxy resin, 6 kg of diethylenetriamine curing agent, 0.5 kg of nano SiO2 particles, 1 kg of rust inhibitor, 0.5 kg of polyether modified organosilicon leveling agent BYK-333, and 0.5 kg of silane coupling agent KH-550.

[0031] The rust inhibitor is a compound of zinc phosphate and aluminum tripolyphosphate in a mass ratio of 1:1.

[0032] The surface-modified polyester powder coating of S4 is composed of 60kg polyester resin XP2525, 5kg isocyanate curing agent N3390, 1kg wear-resistant montmorillonite, 2kg polytetrafluoroethylene micro powder MP1200, 0.1kg benzotriazole ultraviolet absorber UV-327, and 0.5kg silicone leveling agent BYK-358N.

[0033] The preparation method of the wear-resistant montmorillonite is as follows: A1: 130 kg of sodium-based montmorillonite was added to 1200 kg of deionized water and stirred and dispersed at 80℃ and 500 rpm for 30 minutes to obtain an aqueous dispersion of montmorillonite; 8 kg of hexadecyl dimethyl allyl ammonium chloride (CAS: 51706-18-4) was added to adjust the pH of the system to 7, and the mixture was stirred at 85℃ for 2 hours to complete the intercalation reaction; after the reaction, the mixture was filtered, and the filter cake was washed with deionized water until no chloride ions were present. The cake was dried at 100℃ to constant weight and then ground through a 300-mesh sieve to obtain intercalated modified montmorillonite; A2: Add intercalated modified montmorillonite, 1.3 kg zirconium aminophthalate MOF (UIO-66-BDC-NH2), 0.5 kg diethylamine, and 2 kg allyl-terminated polyethylene glycol (molecular weight 400) to a high-speed mixer, heat to 80°C, and stir for 10 minutes; dry the material at 90°C and vacuum degree -0.08 MPa for 100 minutes to obtain wear-resistant montmorillonite. Example 2

[0034] A high-wear-resistant and dense powder coating process for display racks, the operation steps of which are as follows: S1 substrate pretreatment: Select 2.0mm thick cold-rolled steel plate and perform degreasing, rust removal, phosphating, water washing and drying in sequence; S2 Base Coating: Electrostatic powder coating is used to uniformly spray modified epoxy resin powder onto the pretreated substrate surface; the spraying parameters are: spray gun voltage 70kV, spray gun distance from substrate 190mm, powder spraying rate 95kg / min, spraying pressure 0.5MPa; the base coating thickness is 35μm. S3 Base Layer Curing: The sprayed substrate is placed in a curing oven and cured in stages. The first stage is heated to 125°C and held for 8 minutes; the second stage is heated to 168°C and held for 20 minutes; the third stage is heated to 180°C and held for 15 minutes; after curing, it is cooled to room temperature at a rate of 6°C / min. S4 Topcoat Powder Coating: Electrostatic powder coating is used to uniformly spray modified polyester powder coating powder onto the surface of the base coating. The spraying parameters are: spray gun voltage 75kV, distance between spray gun and substrate 200mm, powder spraying rate 105kg / min, spraying pressure 0.5MPa; the topcoat thickness is controlled at 45μm. S5 Three-Stage Curing: The substrate after topcoat spraying is sent back into the curing oven for staged temperature-increase curing. The first stage is heated to 135℃ and held for 8 minutes; the second stage is heated to 175℃ and held for 25 minutes; the third stage is heated to 190℃ and held for 15 minutes; forced air cooling is then applied to 35℃ at a cooling rate of 6℃ / min. S6 Post-processing: The coated surface is lightly sanded with 900-grit sandpaper to remove burrs and protrusions. Then, 0.35MPa high-pressure dust removal is performed to remove defective products such as damaged coatings, missed sprays, bubbles, and orange peel, resulting in a metal display rack with a highly wear-resistant and dense coating.

[0035] The S1 degreasing process uses an alkaline degreasing agent; the alkaline degreasing agent consists of 3 kg sodium hydroxide, 8 kg sodium carbonate, 2 kg sodium silicate, 1 kg fatty alcohol polyoxyethylene ether AEO-9, and 60 kg water; the degreasing temperature is 60℃ and the time is 20 min.

[0036] The S1 rust removal process employs shot blasting with a shot blasting strength of 0.19 MPa and a treatment time of 9 minutes.

[0037] The S1 phosphating uses a zinc-based phosphating solution; the zinc-based phosphating solution consists of 20 kg zinc dihydrogen phosphate, 8 kg zinc nitrate, 0.6 kg sodium nitrite accelerator, 2 kg sodium citrate complexing agent, and 43 kg water; the phosphating temperature is 40℃ and the treatment time is 9 min.

[0038] The S1 water washing temperature is 40℃ and the water washing time is 10 minutes.

[0039] The drying temperature of S1 is 115℃ and the drying time is 25min.

[0040] The S2 base modified epoxy resin powder is composed of 60kg bisphenol A type epoxy resin, 8kg diethylenetriamine curing agent, 1kg nano SiO2 particles, 2kg rust inhibitor, 1kg polyether modified organosilicon leveling agent BYK-333, and 1kg silane coupling agent KH-550.

[0041] The rust inhibitor is a compound of zinc phosphate and aluminum tripolyphosphate in a mass ratio of 1:1.

[0042] The surface-modified polyester powder coating of S4 is composed of 65kg polyester resin XP2525, 6kg isocyanate curing agent N3390, 2kg wear-resistant montmorillonite, 3kg polytetrafluoroethylene micro powder MP1200, 0.2kg benzotriazole ultraviolet absorber UV-327, and 1kg silicone leveling agent BYK-358N.

[0043] The preparation method of the wear-resistant montmorillonite is as follows: A1: 140 kg of sodium-based montmorillonite was added to 1240 kg of deionized water and stirred at 85°C and 550 rpm for 35 minutes to obtain an aqueous dispersion of montmorillonite. 10 kg of hexadecyl dimethyl allyl ammonium chloride (CAS: 51706-18-4) was added to adjust the pH of the system to 7.5. The mixture was stirred at 90°C for 3 hours to complete the intercalation reaction. After the reaction, the mixture was filtered, and the filter cake was washed with deionized water until no chloride ions were present. It was dried at 105°C to constant weight and then ground through a 300-mesh sieve to obtain intercalated modified montmorillonite. A2: Add intercalated modified montmorillonite, 2 kg zirconium aminophthalate MOF (UIO-66-BDC-NH2), 1.5 kg diethylamine, and 3 kg allyl-terminated polyethylene glycol (molecular weight 400) to a high-speed mixer, heat to 85°C, and stir for 15 minutes; dry the material at 95°C and vacuum degree -0.09 MPa for 110 minutes to obtain wear-resistant montmorillonite. Example 3

[0044] A high-wear-resistant and dense powder coating process for display racks, the operation steps of which are as follows: S1 substrate pretreatment: Select 2.0mm thick cold-rolled steel plate and perform degreasing, rust removal, phosphating, water washing and drying in sequence; S2 Base Coating: Electrostatic powder coating is used to uniformly spray modified epoxy resin powder onto the pretreated substrate surface; the spraying parameters are: spray gun voltage 70kV, spray gun distance from substrate 210mm, powder spraying rate 105kg / min, spraying pressure 0.5MPa; the base coating thickness is 35μm. S3 Base Layer Curing: The sprayed substrate is placed in a curing oven and cured in stages. The first stage is heated to 125°C and held for 10 minutes; the second stage is heated to 165°C and held for 20 minutes; the third stage is heated to 180°C and held for 15 minutes; after curing, it is cooled to room temperature at a rate of 7°C / min. S4 Topcoat Powder Coating: Electrostatic powder coating is used to uniformly spray modified polyester powder coating powder onto the surface of the base coating. The spraying parameters are: spray gun voltage 75kV, distance between spray gun and substrate 200mm, powder spraying rate 115kg / min, spraying pressure 0.5MPa; the topcoat thickness is controlled at 45μm. S5 Three-Stage Curing: The substrate after topcoat spraying is sent back into the curing oven for staged temperature-increase curing. The first stage is heated to 135℃ and held for 10 minutes; the second stage is heated to 175℃ and held for 25 minutes; the third stage is heated to 190℃ and held for 15 minutes; forced air cooling is then applied to 35℃ at a cooling rate of 6℃ / min. S6 Post-processing: The coated surface is lightly sanded with 900-grit sandpaper to remove burrs and protrusions. Then, 0.35MPa high-pressure dust removal is performed to remove defective products such as damaged coatings, missed sprays, bubbles, and orange peel, resulting in a metal display rack with a highly wear-resistant and dense coating.

[0045] The S1 degreasing process uses an alkaline degreasing agent; the alkaline degreasing agent consists of 5 kg sodium hydroxide, 10 kg sodium carbonate, 3 kg sodium silicate, 2.5 kg fatty alcohol polyoxyethylene ether AEO-9, and 70 kg water; the degreasing temperature is 60℃ and the time is 20 min.

[0046] The S1 rust removal process employs shot blasting with a shot blasting strength of 0.21 MPa and a treatment time of 11 minutes.

[0047] The S1 phosphating uses a zinc-based phosphating solution; the zinc-based phosphating solution consists of 23 kg zinc dihydrogen phosphate, 10 kg zinc nitrate, 1.2 kg sodium nitrite accelerator, 2 kg sodium citrate complexing agent, and 48 kg water; the phosphating temperature is 40℃ and the treatment time is 11 min.

[0048] The S1 water washing temperature is 40℃ and the water washing time is 10 minutes.

[0049] The drying temperature of S1 is 125℃ and the drying time is 25min.

[0050] The S2 base modified epoxy resin powder coating consists of 70kg bisphenol A type epoxy resin, 10kg diethylenetriamine curing agent, 2kg nano SiO2 particles, 4kg rust inhibitor, 1.5kg polyether modified organosilicon leveling agent BYK-333, and 1.5kg silane coupling agent KH-550.

[0051] The rust inhibitor is a compound of zinc phosphate and aluminum tripolyphosphate in a mass ratio of 1:1.

[0052] The surface-modified polyester powder coating of S4 is composed of 75kg polyester resin XP2525, 8kg isocyanate curing agent N3390, 4kg wear-resistant montmorillonite, 5kg polytetrafluoroethylene micro powder MP1200, 0.4kg benzotriazole ultraviolet absorber UV-327, and 1.5kg silicone leveling agent BYK-358N.

[0053] The preparation method of the wear-resistant montmorillonite is as follows: A1: 150 kg of sodium-based montmorillonite was added to 1280 kg of deionized water and stirred at 85°C and 550 rpm for 35 minutes to obtain an aqueous dispersion of montmorillonite. 13 kg of hexadecyl dimethyl allyl ammonium chloride (CAS: 51706-18-4) was added to adjust the pH of the system to 7.5. The mixture was stirred at 90°C for 3 hours to complete the intercalation reaction. After the reaction, the mixture was filtered, and the filter cake was washed with deionized water until no chloride ions were present. It was then dried at 105°C to constant weight and ground through a 200-mesh sieve to obtain intercalated modified montmorillonite. A2: Add intercalated modified montmorillonite, 3.2 kg zirconium aminophthalate MOF (UIO-66-BDC-NH2), 1.5 kg diethylamine, and 4 kg allyl-terminated polyethylene glycol (molecular weight 400) to a high-speed mixer, heat to 85°C, and stir for 25 minutes; dry the material at 95°C and vacuum degree -0.09 MPa for 140 minutes to obtain wear-resistant montmorillonite. Example 4

[0054] A high-wear-resistant and dense powder coating process for display racks, the operation steps of which are as follows: S1 substrate pretreatment: Select 2.0mm thick cold-rolled steel plate and perform degreasing, rust removal, phosphating, water washing and drying in sequence; S2 Base Coating: Electrostatic powder coating is used to uniformly spray modified epoxy resin powder onto the pretreated substrate surface; the spraying parameters are: spray gun voltage 75kV, spray gun distance from substrate 220mm, powder spraying rate 110kg / min, spraying pressure 0.6MPa; the base coating thickness is 40μm. S3 Base Layer Curing: The sprayed substrate is placed in a curing oven and cured in stages. The first stage is heated to 130°C and held for 12 minutes; the second stage is heated to 170°C and held for 25 minutes; the third stage is heated to 185°C and held for 20 minutes; after curing, it is cooled to room temperature at a rate of 8°C / min. S4 Topcoat Powder Coating: Electrostatic powder coating is used to uniformly spray modified polyester powder onto the surface of the base coating. The spraying parameters are: spray gun voltage 80kV, distance between spray gun and substrate 210mm, powder spraying rate 120kg / min, spraying pressure 0.55MPa; the topcoat thickness is controlled at 50μm. S5 Three-Stage Curing: The substrate after topcoat spraying is sent back into the curing oven for staged temperature-increase curing. The first stage is heated to 140℃ and held for 12 minutes; the second stage is heated to 180℃ and held for 30 minutes; the third stage is heated to 195℃ and held for 20 minutes; forced air cooling is then applied to 35℃ at a cooling rate of 7℃ / min. S6 Post-processing: The coated surface is lightly sanded with 900-grit sandpaper to remove burrs and protrusions. Then, 0.35MPa high-pressure dust removal is performed to remove defective products such as damaged coatings, missed sprays, bubbles, and orange peel, resulting in a metal display rack with a highly wear-resistant and dense coating.

[0055] The S1 degreasing process uses an alkaline degreasing agent; the alkaline degreasing agent consists of 6 kg sodium hydroxide, 12 kg sodium carbonate, 4 kg sodium silicate, 3 kg fatty alcohol polyoxyethylene ether AEO-9, and 75 kg water; the degreasing temperature is 65℃ and the time is 25 min.

[0056] The S1 rust removal process employs shot blasting with a shot blasting strength of 0.22 MPa and a treatment time of 12 minutes.

[0057] The S1 phosphating uses a zinc-based phosphating solution; the zinc-based phosphating solution consists of 25 kg zinc dihydrogen phosphate, 12 kg zinc nitrate, 1.5 kg sodium nitrite accelerator, 3 kg sodium citrate complexing agent, and 50 kg water; the phosphating temperature is 45℃ and the treatment time is 12 min.

[0058] The S1 water washing temperature is 45℃ and the water washing time is 15min.

[0059] The drying temperature of S1 is 130℃ and the drying time is 30 minutes.

[0060] The S2 base modified epoxy resin powder coating consists of 75kg bisphenol A type epoxy resin, 12kg diethylenetriamine curing agent, 2.5kg nano SiO2 particles, 5kg rust inhibitor, 2kg polyether modified organosilicon leveling agent BYK-333, and 2kg silane coupling agent KH-550.

[0061] The rust inhibitor is a compound of zinc phosphate and aluminum tripolyphosphate in a mass ratio of 1:1.

[0062] The surface-modified polyester powder coating of S4 is composed of 80kg polyester resin XP2525, 10kg isocyanate curing agent N3390, 5kg wear-resistant montmorillonite, 6kg polytetrafluoroethylene micro powder MP1200, 0.5kg benzotriazole ultraviolet absorber UV-327, and 2kg silicone leveling agent BYK-358N.

[0063] The preparation method of the wear-resistant montmorillonite is as follows: A1: 160 kg of sodium-based montmorillonite was added to 1300 kg of deionized water and stirred at 90 °C and 600 rpm for 40 minutes to obtain an aqueous dispersion of montmorillonite. 15 kg of hexadecyl dimethyl allyl ammonium chloride (CAS: 51706-18-4) was added to the dispersion to adjust the pH of the system to 8. The mixture was stirred at 95 °C for 4 hours to complete the intercalation reaction. After the reaction, the mixture was filtered, and the filter cake was washed with deionized water until no chloride ions were present. The cake was dried at 110 °C to constant weight and then ground through a 200-mesh sieve to obtain intercalated modified montmorillonite. A2: Add intercalated modified montmorillonite, 3.8 kg zirconium aminophthalate MOF (UIO-66-BDC-NH2), 2 kg diethylamine, and 5 kg allyl-terminated polyethylene glycol (molecular weight 400) to a high-speed mixer, heat to 90°C, and stir for 30 minutes; dry the material at 100°C and vacuum degree -0.1 MPa for 150 minutes to obtain wear-resistant montmorillonite.

[0064] Comparative Example 1 A high-wear-resistant and dense powder coating process for display racks, the operation steps of which are as follows: S1 substrate pretreatment: Select 2.0mm thick cold-rolled steel plate and perform degreasing, rust removal, phosphating, water washing and drying in sequence; S2 Base Coating: Electrostatic powder coating is used to uniformly spray modified epoxy resin powder onto the pretreated substrate surface; the spraying parameters are: spray gun voltage 65kV, spray gun distance from substrate 180mm, powder spraying rate 90kg / min, spraying pressure 0.4MPa; the base coating thickness is 30μm. S3 Base Layer Curing: The sprayed substrate is placed in a curing oven and cured in stages. The first stage is heated to 120°C and held for 6 minutes; the second stage is heated to 160°C and held for 15 minutes; the third stage is heated to 175°C and held for 10 minutes; after curing, it is cooled to room temperature at a rate of 5°C / min. S4 Topcoat Powder Coating: Electrostatic powder coating is used to uniformly spray modified polyester powder coating powder onto the surface of the base coating. The spraying parameters are: spray gun voltage 70kV, distance between spray gun and substrate 190mm, powder spraying rate 100kg / min, spraying pressure 0.45MPa; the topcoat thickness is controlled at 40μm. S5 Three-Stage Curing: The substrate after topcoat spraying is sent back into the curing oven for staged temperature-increase curing. The first stage is heated to 130℃ and held for 6 minutes; the second stage is heated to 170℃ and held for 20 minutes; the third stage is heated to 185℃ and held for 10 minutes; forced air cooling is then applied to 35℃ at a cooling rate of 5℃ / min. S6 Post-processing: The coated surface is lightly sanded with 900-grit sandpaper to remove burrs and protrusions. Then, 0.35MPa high-pressure dust removal is performed to remove defective products such as damaged coatings, missed sprays, bubbles, and orange peel, resulting in a metal display rack with a highly wear-resistant and dense coating.

[0065] The S1 degreasing process uses an alkaline degreasing agent; the alkaline degreasing agent consists of 2 kg sodium hydroxide, 6 kg sodium carbonate, 1 kg sodium silicate, 0.5 kg fatty alcohol polyoxyethylene ether AEO-9, and 55 kg water; the degreasing temperature is 55℃ and the time is 15 min.

[0066] The S1 rust removal process employs shot blasting with a shot blasting strength of 0.18 MPa and a treatment time of 8 minutes.

[0067] The S1 phosphating uses a zinc-based phosphating solution; the zinc-based phosphating solution consists of 15 kg zinc dihydrogen phosphate, 6 kg zinc nitrate, 0.3 kg sodium nitrite accelerator, 1 kg sodium citrate complexing agent, and 40 kg water; the phosphating temperature is 35℃ and the treatment time is 8 min.

[0068] The S1 water washing temperature is 35℃, and the water washing time is 5 minutes.

[0069] The drying temperature of S1 is 110℃ and the drying time is 20min.

[0070] The S2 base modified epoxy resin powder coating consists of 55 kg of bisphenol A type epoxy resin, 6 kg of diethylenetriamine curing agent, 0.5 kg of nano SiO2 particles, 1 kg of rust inhibitor, 0.5 kg of polyether modified organosilicon leveling agent BYK-333, and 0.5 kg of silane coupling agent KH-550.

[0071] The rust inhibitor is a compound of zinc phosphate and aluminum tripolyphosphate in a mass ratio of 1:1.

[0072] The surface-modified polyester powder coating of S4 is composed of 60kg polyester resin XP2525, 5kg isocyanate curing agent N3390, 2kg polytetrafluoroethylene micro powder MP1200, 0.1kg benzotriazole ultraviolet absorber UV-327, and 0.5kg silicone leveling agent BYK-358N.

[0073] Comparative Example 2 A high-wear-resistant and dense powder coating process for display racks, the operation steps of which are as follows: S1 substrate pretreatment: Select 2.0mm thick cold-rolled steel plate and perform degreasing, rust removal, phosphating, water washing and drying in sequence; S2 Base Coating: Electrostatic powder coating is used to uniformly spray modified epoxy resin powder onto the pretreated substrate surface; the spraying parameters are: spray gun voltage 65kV, spray gun distance from substrate 180mm, powder spraying rate 90kg / min, spraying pressure 0.4MPa; the base coating thickness is 30μm. S3 Base Layer Curing: The sprayed substrate is placed in a curing oven and cured in stages. The first stage is heated to 120°C and held for 6 minutes; the second stage is heated to 160°C and held for 15 minutes; the third stage is heated to 175°C and held for 10 minutes; after curing, it is cooled to room temperature at a rate of 5°C / min. S4 Topcoat Powder Coating: Electrostatic powder coating is used to uniformly spray modified polyester powder coating powder onto the surface of the base coating. The spraying parameters are: spray gun voltage 70kV, distance between spray gun and substrate 190mm, powder spraying rate 100kg / min, spraying pressure 0.45MPa; the topcoat thickness is controlled at 40μm. S5 Three-Stage Curing: The substrate after topcoat spraying is sent back into the curing oven for staged temperature-increase curing. The first stage is heated to 130℃ and held for 6 minutes; the second stage is heated to 170℃ and held for 20 minutes; the third stage is heated to 185℃ and held for 10 minutes; forced air cooling is then applied to 35℃ at a cooling rate of 5℃ / min. S6 Post-processing: The coated surface is lightly sanded with 900-grit sandpaper to remove burrs and protrusions. Then, 0.35MPa high-pressure dust removal is performed to remove defective products such as damaged coatings, missed sprays, bubbles, and orange peel, resulting in a metal display rack with a highly wear-resistant and dense coating.

[0074] The S1 degreasing process uses an alkaline degreasing agent; the alkaline degreasing agent consists of 2 kg sodium hydroxide, 6 kg sodium carbonate, 1 kg sodium silicate, 0.5 kg fatty alcohol polyoxyethylene ether AEO-9, and 55 kg water; the degreasing temperature is 55℃ and the time is 15 min.

[0075] The S1 rust removal process employs shot blasting with a shot blasting strength of 0.18 MPa and a treatment time of 8 minutes.

[0076] The S1 phosphating uses a zinc-based phosphating solution; the zinc-based phosphating solution consists of 15 kg zinc dihydrogen phosphate, 6 kg zinc nitrate, 0.3 kg sodium nitrite accelerator, 1 kg sodium citrate complexing agent, and 40 kg water; the phosphating temperature is 35℃ and the treatment time is 8 min.

[0077] The S1 water washing temperature is 35℃, and the water washing time is 5 minutes.

[0078] The drying temperature of S1 is 110℃ and the drying time is 20min.

[0079] The S2 base modified epoxy resin powder coating consists of 55 kg of bisphenol A type epoxy resin, 6 kg of diethylenetriamine curing agent, 0.5 kg of nano SiO2 particles, 1 kg of rust inhibitor, 0.5 kg of polyether modified organosilicon leveling agent BYK-333, and 0.5 kg of silane coupling agent KH-550.

[0080] The rust inhibitor is a compound of zinc phosphate and aluminum tripolyphosphate in a mass ratio of 1:1.

[0081] The surface-modified polyester powder coating of S4 is composed of 60kg polyester resin XP2525, 5kg isocyanate curing agent N3390, 1kg wear-resistant montmorillonite, 2kg polytetrafluoroethylene micro powder MP1200, 0.1kg benzotriazole ultraviolet absorber UV-327, and 0.5kg silicone leveling agent BYK-358N.

[0082] The preparation method of the wear-resistant montmorillonite is as follows: A1: 130 kg of sodium-based montmorillonite was added to 1200 kg of deionized water and stirred and dispersed at 80 °C and 500 rpm for 30 minutes to obtain an aqueous dispersion of montmorillonite; 8 kg of hexadecyl dimethyl allyl ammonium chloride (CAS: 51706-18-4) was added to adjust the pH of the system to 7, and the mixture was stirred at 85 °C for 2 hours to complete the intercalation reaction; after the reaction, the mixture was filtered, and the filter cake was washed with deionized water until no chloride ions were present. The cake was dried at 100 °C to constant weight and then ground through a 300-mesh sieve to obtain intercalated modified montmorillonite; A2: Add intercalated modified montmorillonite, 0.5 kg diethylamine, and 2 kg allyl-terminated polyethylene glycol (molecular weight 400) to a high-speed mixer, heat to 80°C, and stir for 10 minutes; dry the material at 90°C and vacuum degree -0.08 MPa for 100 minutes to obtain wear-resistant montmorillonite.

[0083] Comparative Example 3 A high-wear-resistant and dense powder coating process for display racks, the operation steps of which are as follows: S1 substrate pretreatment: Select 2.0mm thick cold-rolled steel plate and perform degreasing, rust removal, phosphating, water washing and drying in sequence; S2 Base Coating: Electrostatic powder coating is used to uniformly spray modified epoxy resin powder onto the pretreated substrate surface; the spraying parameters are: spray gun voltage 65kV, spray gun distance from substrate 180mm, powder spraying rate 90kg / min, spraying pressure 0.4MPa; the base coating thickness is 30μm. S3 Base Layer Curing: The sprayed substrate is placed in a curing oven and cured in stages. The first stage is heated to 120°C and held for 6 minutes; the second stage is heated to 160°C and held for 15 minutes; the third stage is heated to 175°C and held for 10 minutes; after curing, it is cooled to room temperature at a rate of 5°C / min. S4 Topcoat Powder Coating: Electrostatic powder coating is used to uniformly spray modified polyester powder coating powder onto the surface of the base coating. The spraying parameters are: spray gun voltage 70kV, distance between spray gun and substrate 190mm, powder spraying rate 100kg / min, spraying pressure 0.45MPa; the topcoat thickness is controlled at 40μm. S5 Three-Stage Curing: The substrate after topcoat spraying is sent back into the curing oven for staged temperature-increase curing. The first stage is heated to 130℃ and held for 6 minutes; the second stage is heated to 170℃ and held for 20 minutes; the third stage is heated to 185℃ and held for 10 minutes; forced air cooling is then applied to 35℃ at a cooling rate of 5℃ / min. S6 Post-processing: The coated surface is lightly sanded with 900-grit sandpaper to remove burrs and protrusions. Then, 0.35MPa high-pressure dust removal is performed to remove defective products such as damaged coatings, missed sprays, bubbles, and orange peel, resulting in a metal display rack with a highly wear-resistant and dense coating.

[0084] The S1 degreasing process uses an alkaline degreasing agent; the alkaline degreasing agent consists of 2 kg sodium hydroxide, 6 kg sodium carbonate, 1 kg sodium silicate, 0.5 kg fatty alcohol polyoxyethylene ether AEO-9, and 55 kg water; the degreasing temperature is 55℃ and the time is 15 min.

[0085] The S1 rust removal process employs shot blasting with a shot blasting strength of 0.18 MPa and a treatment time of 8 minutes.

[0086] The S1 phosphating uses a zinc-based phosphating solution; the zinc-based phosphating solution consists of 15 kg zinc dihydrogen phosphate, 6 kg zinc nitrate, 0.3 kg sodium nitrite accelerator, 1 kg sodium citrate complexing agent, and 40 kg water; the phosphating temperature is 35℃ and the treatment time is 8 min.

[0087] The S1 water washing temperature is 35℃, and the water washing time is 5 minutes.

[0088] The drying temperature of S1 is 110℃ and the drying time is 20min.

[0089] The S2 base modified epoxy resin powder coating consists of 55 kg of bisphenol A type epoxy resin, 6 kg of diethylenetriamine curing agent, 0.5 kg of nano SiO2 particles, 1 kg of rust inhibitor, 0.5 kg of polyether modified organosilicon leveling agent BYK-333, and 0.5 kg of silane coupling agent KH-550.

[0090] The rust inhibitor is a compound of zinc phosphate and aluminum tripolyphosphate in a mass ratio of 1:1.

[0091] The surface-modified polyester powder coating of S4 is composed of 60kg polyester resin XP2525, 5kg isocyanate curing agent N3390, 1kg wear-resistant montmorillonite, 2kg polytetrafluoroethylene micro powder MP1200, 0.1kg benzotriazole ultraviolet absorber UV-327, and 0.5kg silicone leveling agent BYK-358N.

[0092] The preparation method of the wear-resistant montmorillonite is as follows: A1: 130 kg of sodium-based montmorillonite was added to 1200 kg of deionized water and stirred and dispersed at 80 °C and 500 rpm for 30 minutes to obtain an aqueous dispersion of montmorillonite; 8 kg of hexadecyl dimethyl allyl ammonium chloride (CAS: 51706-18-4) was added to adjust the pH of the system to 7, and the mixture was stirred at 85 °C for 2 hours to complete the intercalation reaction; after the reaction, the mixture was filtered, and the filter cake was washed with deionized water until no chloride ions were present. The cake was dried at 100 °C to constant weight and then ground through a 300-mesh sieve to obtain intercalated modified montmorillonite; A2: Add intercalated modified montmorillonite, 1.3 kg zirconium aminophthalate MOF (UIO-66-BDC-NH2), and 0.5 kg diethylamine to a high-speed mixer, heat to 80℃, and stir for 10 minutes; dry the material at 90℃ and vacuum degree -0.08MPa for 100 minutes to obtain wear-resistant montmorillonite.

[0093] Table 1 shows the adhesion grade, abrasion resistance, neutral salt spray test results, and impact resistance test results of the display rack coating in the specific implementation plan. Adhesion rating (level) Abrasion resistance (mkg) neutral salt spray test Impact resistance Example 1 0 9 No red rust, no bubbles No cracks, no peeling Example 2 0 6 No red rust, no bubbles No cracks, no peeling Example 3 0 6 No red rust, no bubbles No cracks, no peeling Example 4 0 5 No red rust, no bubbles No cracks, no peeling Comparative Example 1 4 45 Extensive red rust and coating peeling cracking, peeling Comparative Example 2 1 18 Localized red rust, slight bubbles Slight cracking, no peeling Comparative Example 3 1 15 Localized red rust, slight bubbles Slight cracking, no peeling From the perspective of the four core testing indicators of adhesion, wear resistance, neutral salt spray resistance and impact resistance, the coating performance of the display rack prepared by this process is far superior to that of the comparative sample. The coatings of the examples all achieved the optimal adhesion level, and the wear resistance, corrosion resistance and rust prevention and impact resistance performance were all excellent. In contrast, the coatings of the comparative sample showed varying degrees of performance degradation, and were accompanied by obvious defects such as red rust, cracking and peeling.

[0094] The introduction of novel monomers in the preparation of wear-resistant montmorillonite and the modification of powder coating is the core innovation of this process. Novel monomers such as hexadecyl dimethyl allyl ammonium chloride, zirconium aminophthalate MOF, and allyl-terminated polyethylene glycol participate in the intercalation modification of montmorillonite and the cross-linking of resin. This not only achieves densification of the internal structure of the coating, but also improves the compatibility between functional fillers and resin matrix. It improves the wear resistance and resistance to media penetration of the coating at the microscopic level, which is the key reason for the significant improvement in the wear resistance and salt spray resistance of the coating in the example.

[0095] The synergistic application of the double-layer powder coating structure and the segmented curing process is an important guarantee for achieving excellent coating adhesion and impact resistance. This process combination fully strengthens the bonding force between the bottom layer and the substrate, as well as between the double-layer coating, so that the coating does not crack or peel off when subjected to impact, making it well-suited for the frequent bumps and knocks encountered in the daily use of display racks.

[0096] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A high-wear-resistant and dense powder coating process for display racks, the operation steps of which are as follows: S1 substrate pretreatment: Select 2.0mm thick cold-rolled steel plate and perform degreasing, rust removal, phosphating, water washing and drying in sequence; S2 Undercoat Powder Coating: Modified epoxy resin powder is evenly sprayed onto the pretreated substrate surface using electrostatic powder coating to form an undercoat. Spraying parameters are: spray gun voltage 65-75kV, spray gun distance to substrate 180-220mm, powder application rate 90-110kg / min, spraying pressure 0.4-0.6MPa; undercoat thickness is 30-40μm. S3 Base Layer Curing: The sprayed substrate is placed in a curing oven for staged heating and curing. The first stage is heated to 120-130℃ and held for 6-12 minutes; the second stage is heated to 160-170℃ and held for 15-25 minutes; the third stage is heated to 175-185℃ and held for 10-20 minutes. After curing, the substrate is cooled to room temperature at a rate of 5-8℃ / min. S4 Topcoat Powder Coating: Electrostatic powder coating is used to evenly spray modified polyester powder onto the surface of the base coating to form the topcoat. Spraying parameters are: spray gun voltage 70-80kV, spray gun distance from substrate 190-210mm, powder application rate 100-120kg / min, spraying pressure 0.45-0.55MPa; topcoat thickness is controlled at 40-50μm. S5 Three-Stage Curing: The substrate after topcoat spraying is sent back into the curing oven for staged temperature-increase curing. The first stage is heated to 130-140℃ and held for 6-12 minutes; the second stage is heated to 170-180℃ and held for 20-30 minutes; the third stage is heated to 185-195℃ and held for 10-20 minutes; forced air cooling is then applied to 35℃ at a cooling rate of 5-7℃ / min. S6 Post-processing: The coated surface is lightly sanded with 900-grit sandpaper to remove burrs and protrusions. Then, 0.35MPa high-pressure dust removal is performed to remove defective products with damaged coating, missed spraying, bubbles, orange peel, etc., to obtain a metal display rack with a high wear-resistant and dense coating. The modified polyester powder of S4 is composed of polyester resin, isocyanate curing agent, wear-resistant montmorillonite, polytetrafluoroethylene micro powder, benzotriazole ultraviolet absorber, and organosilicon leveling agent. The wear-resistant montmorillonite is prepared by intercalation modification of sodium montmorillonite with deionized water and hexadecyl dimethyl allyl ammonium chloride, followed by reaction with zirconium aminophthalate, diethylamine, and allyl-terminated polyethylene glycol.

2. The high wear-resistant and dense coating powder coating process for display racks according to claim 1, characterized in that: The S1 degreasing agent uses an alkaline degreasing agent; by mass, the alkaline degreasing agent consists of 2-6 parts sodium hydroxide, 6-12 parts sodium carbonate, 1-4 parts sodium silicate, 0.5-3 parts fatty alcohol polyoxyethylene ether, and 55-75 parts water; the degreasing temperature is 55-65℃, and the time is 15-25 minutes.

3. The high wear-resistant and dense coating powder coating process for display racks according to claim 1, characterized in that: The S1 rust removal process employs shot blasting with a shot blasting strength of 0.18-0.22 MPa and a treatment time of 8-12 minutes.

4. The high wear-resistant and dense coating powder coating process for display racks according to claim 1, characterized in that: The S1 phosphating uses a zinc-based phosphating solution; by mass, the zinc-based phosphating solution consists of 15-25 parts zinc dihydrogen phosphate, 6-12 parts zinc nitrate, 0.3-1.5 parts sodium nitrite accelerator, 1-3 parts sodium citrate complexing agent, and 40-50 parts water; the phosphating temperature is 35-45℃, and the treatment time is 8-12 minutes.

5. The high wear-resistant and dense coating powder coating process for display racks according to claim 1, characterized in that: The S1 water washing temperature is 35-45℃, and the water washing time is 5-15 minutes.

6. The high wear-resistant and dense coating powder coating process for display racks according to claim 1, characterized in that: The drying temperature of S1 is 110-130℃, and the drying time is 20-30 minutes.

7. The high wear-resistant and dense coating powder coating process for display racks according to claim 1, characterized in that: The modified epoxy resin powder of S2 is composed of 55-75 parts by weight of bisphenol A type epoxy resin, 6-12 parts of diethylenetriamine curing agent, 0.5-2.5 parts of nano SiO2 particles, 1-5 parts of rust inhibitor, 0.5-2 parts of polyether modified organosilicon leveling agent, and 0.5-2 parts of silane coupling agent.

8. The high wear-resistant and dense coating powder coating process for display racks according to claim 7, characterized in that: The rust inhibitor is a compound of zinc phosphate and aluminum tripolyphosphate in a mass ratio of 1:

1.

9. The high wear-resistant and dense coating powder coating process for display racks according to claim 1, characterized in that: The modified polyester powder of S4 is composed of 60-80 parts polyester resin, 5-10 parts isocyanate curing agent, 1-5 parts wear-resistant montmorillonite, 2-6 parts polytetrafluoroethylene micro powder, 0.1-0.5 parts benzotriazole ultraviolet absorber, and 0.5-2 parts organosilicon leveling agent by weight.

10. The high wear-resistant and dense coating powder coating process for display racks according to claim 9, characterized in that: The preparation method of the wear-resistant montmorillonite is as follows, according to parts by mass: A1: Add 130-160 parts of sodium-based montmorillonite to 1200-1300 parts of deionized water, and stir and disperse at 80-90℃ and 500-600 rpm for 30-40 minutes to obtain an aqueous dispersion of montmorillonite; add 8-15 parts of hexadecyl dimethyl allyl ammonium chloride to adjust the pH of the system to 7-8, and stir at 85-95℃ for 2-4 hours to complete the intercalation reaction; after the reaction, filter, wash the filter cake with deionized water until there are no chloride ions, dry it at 100-110℃ to constant weight, and grind it through a 200-300 mesh sieve to obtain intercalated modified montmorillonite; A2: Add intercalated modified montmorillonite, 1.3-3.8 parts zirconium aminophthalate, 0.5-2 parts diethylamine, and 2-5 parts allyl-terminated polyethylene glycol to a high-speed mixer, heat to 80-90℃, and stir for 10-30 minutes; dry the material at 90-100℃ and a vacuum of -0.08 to -0.1 MPa for 100-150 minutes to obtain wear-resistant montmorillonite.