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CN-122007001-A - High-wear-resistance compact coating spraying technology for display rack

CN122007001ACN 122007001 ACN122007001 ACN 122007001ACN-122007001-A

Abstract

The invention relates to a high wear-resistant compact coating spraying technology for a display rack, and relates to the technical field of surface treatment of display racks. The invention discloses a metal display rack with high wear-resistant compact coating, which is prepared by selecting a cold-rolled steel plate, sequentially carrying out oil removal, rust removal, phosphating, washing and drying treatment, uniformly spraying bottom modified epoxy resin plastic powder on the surface of a pretreated substrate by adopting an electrostatic plastic spraying mode, curing, uniformly spraying surface modified polyester plastic powder on the surface of a bottom coating by adopting an electrostatic plastic spraying mode, curing, slightly polishing the surface of the coating, and removing dust at high pressure.

Inventors

  • ZHANG JUNHUI
  • WANG XIAOQING
  • ZHANG LIHONG
  • JI MINGWEI

Assignees

  • 浦江县大禾展示设备有限公司

Dates

Publication Date
20260512
Application Date
20260317

Claims (10)

  1. 1. A plastic spraying process for a high wear-resistant compact coating of a display rack comprises the following operation steps: S1, preprocessing a base material, namely selecting a cold-rolled steel plate with the thickness of 2.0mm, and sequentially carrying out oil removal, rust removal, phosphating, water washing and drying treatment; s2, spraying plastic on the bottom layer, namely uniformly spraying modified epoxy resin plastic powder on the surface of the pretreated substrate in an electrostatic plastic spraying mode to form a bottom layer coating, wherein the spraying parameters are that the voltage of a spray gun is 65-75kV, the distance between the spray gun and the substrate is 180-220mm, the powder spraying amount is 90-110kg/min, the spraying pressure is 0.4-0.6MPa, and the thickness of the bottom layer coating is 30-40 mu m; S3, the bottom layer is solidified, namely the sprayed base material is sent into a solidifying furnace to be solidified by section heating, the first section is heated to 120-130 ℃, the temperature is kept for 6-12min, the second section is heated to 160-170 ℃, the temperature is kept for 15-25min, the third section is heated to 175-185 ℃ and the temperature is kept for 10-20min, and the base material is cooled to room temperature after solidification, wherein the cooling speed is 5-8 ℃ per min; S4, spraying the surface layer with the modified polyester spraying powder uniformly on the surface of the bottom layer coating in an electrostatic spraying mode to form the surface layer, wherein the spraying parameters are that the voltage of a spray gun is 70-80kV, the distance between the spray gun and a base material is 190-210mm, the spraying powder amount is 100-120kg/min, the spraying pressure is 0.45-0.55MPa, and the thickness of the surface layer coating is controlled to be 40-50 mu m; s5, curing for three times, namely, feeding the base material sprayed with the surface layer into a curing furnace again, carrying out sectional heating curing, wherein the temperature is raised to 130-140 ℃ in the first section, the temperature is kept for 6-12min, the temperature is raised to 170-180 ℃ in the second section, the temperature is kept for 20-30min, the temperature is raised to 185-195 ℃ in the third section, the temperature is kept for 10-20min, forced air cooling is carried out to 35 ℃, and the cooling rate is 5-7 ℃ per min S6, post-treatment, namely lightly polishing the surface of the coating by using 900-mesh sand paper, removing burrs and bulges, and then carrying out high-pressure dust removal under the pressure of 0.35MPa, so as to remove damaged, leaked spraying, bubbles and unqualified orange peel products of the coating, thereby obtaining a metal display rack with a high wear-resistant compact coating; The modified polyester plastic spraying powder of the S4 consists of polyester resin, isocyanate curing agent, wear-resistant montmorillonite, polytetrafluoroethylene micro powder, benzotriazole ultraviolet absorbent and organosilicon leveling agent; The wear-resistant montmorillonite is prepared by intercalation modification of sodium montmorillonite by deionized water and hexadecyl dimethyl allyl ammonium chloride, and then reaction of the modified sodium montmorillonite with zirconium amino phthalate, diethylamine and allyl end-capped polyethylene glycol.
  2. 2. The high wear-resistant compact coating spraying plastic process for the display rack is characterized in that the S1 oil removal agent is composed of, by mass, 2-6 parts of sodium hydroxide, 6-12 parts of sodium carbonate, 1-4 parts of sodium silicate, 0.5-3 parts of fatty alcohol polyoxyethylene ether and 55-75 parts of water, wherein the oil removal temperature is 55-65 ℃ and the oil removal time is 15-25min.
  3. 3. The high wear-resistant compact coating plastic spraying process for the display rack, which is disclosed in claim 1, is characterized in that the S1 rust removal adopts shot blasting treatment, the shot blasting strength is 0.18-0.22MPa, and the treatment time is 8-12min.
  4. 4. The spray molding process of the high wear-resistant compact coating of the display stand, which is characterized in that the S1 phosphating is performed by adopting zinc phosphating solution, the zinc phosphating solution consists of, by mass, 15-25 parts of zinc dihydrogen phosphate, 6-12 parts of zinc nitrate, 0.3-1.5 parts of sodium nitrite accelerator, 1-3 parts of sodium citrate complexing agent and 40-50 parts of water, the phosphating temperature is 35-45 ℃, and the treatment time is 8-12min.
  5. 5. The spray molding process of the high wear-resistant compact coating of the display stand according to claim 1, wherein the S1 washing temperature is 35-45 ℃ and the washing time is 5-15min.
  6. 6. The high wear-resistant compact coating plastic spraying process for the display rack of claim 1, wherein the S1 drying temperature is 110-130 ℃ and the drying time is 20-30min.
  7. 7. The high wear-resistant compact coating spraying technology of the display stand, which is characterized in that the modified epoxy resin spraying powder of S2 consists of, by mass, 55-75 parts of bisphenol A type epoxy resin, 6-12 parts of diethylenetriamine curing agent, 0.5-2.5 parts of nano SiO 2 particles, 1-5 parts of antirust agent, 0.5-2 parts of polyether modified organosilicon leveling agent and 0.5-2 parts of silane coupling agent.
  8. 8. The process for spraying plastic on the high-wear-resistance compact coating of the display stand, as claimed in claim 7, wherein the rust inhibitor is a compound of zinc phosphate and aluminum tripolyphosphate, and the mass ratio of the zinc phosphate to the aluminum tripolyphosphate is 1:1.
  9. 9. The high wear-resistant compact coating spraying technology of the display stand, which is characterized in that the modified polyester spraying powder of the S4 is composed of, by mass, 60-80 parts of polyester resin, 5-10 parts of isocyanate curing agents, 1-5 parts of wear-resistant montmorillonite, 2-6 parts of polytetrafluoroethylene micro powder, 0.1-0.5 part of benzotriazole ultraviolet absorbers and 0.5-2 parts of organosilicon leveling agents.
  10. 10. The high wear-resistant compact coating plastic spraying process for the display rack, which is disclosed in claim 9, is characterized in that the preparation method of the wear-resistant montmorillonite comprises the following steps in parts by weight: Adding 130-160 parts of sodium montmorillonite into 1200-1300 parts of deionized water, stirring and dispersing for 30-40 minutes at the temperature of 80-90 ℃ and the rotating speed of 500-600rpm to prepare montmorillonite aqueous dispersion, adding 8-15 parts of hexadecyl dimethyl allyl ammonium chloride into the montmorillonite aqueous dispersion, regulating the pH value of the system to 7-8, stirring for 2-4 hours at the constant temperature of 85-95 ℃ to complete intercalation reaction, filtering after the reaction, washing a filter cake with deionized water until no chloride ions exist, drying to constant weight at the temperature of 100-110 ℃, and grinding the filter cake to obtain intercalation modified montmorillonite through a 200-300 mesh sieve; A2, adding intercalation modified montmorillonite, 1.3-3.8 parts of zirconium amino phthalate, 0.5-2 parts of diethylamine and 2-5 parts of allyl end-capped polyethylene glycol into a high-speed mixer, heating to 80-90 ℃ and stirring for 10-30 minutes, and drying the materials at 90-100 ℃ and vacuum degree of-0.08-0.1 MPa for 100-150 minutes to obtain the wear-resistant montmorillonite.

Description

High-wear-resistance compact coating spraying technology for display rack Technical Field The invention relates to the technical field of surface treatment of display frames, in particular to a high wear-resistant compact coating plastic spraying process of a display frame. Background The metal showing stand is widely applied to places such as markets, supermarkets, monopoly shops, exhibition halls and the like due to the advantages of firm structure, strong bearing capacity, flexible modeling and the like, and is used for showing and displaying various commodities. But in the use, metal show shelf exposes in air, steam for a long time, and frequently receives friction, the collision when commodity gets and puts to and the erosion of external dust, corrosive gas leads to its surface coating to appear wearing and tearing easily, drops, corrosion scheduling problem, not only influences the outward appearance aesthetic measure of show shelf, reduces the whole feel of commodity display, still can shorten the life of show shelf, increases user's replacement cost and maintenance cost. Chinese patent CN108510904a discloses a home design display device, which comprises a bottom moving roller, a bottom fixing seat, a drawing scanner and a drawing placing groove, wherein a roller fixing frame is installed above the bottom moving roller, an adjusting hydraulic cylinder is arranged above the bottom fixing seat, an image converter is installed below the drawing scanner, a liquid crystal display is installed below the image converter, a design display frame is communicated below the liquid crystal display, the drawing placing groove is installed above the design display frame, an operation control box is installed below the drawing placing groove, a control button is installed above the operation control box, and a magnetic fixing head is installed above the design display frame. Chinese patent CN121003360a relates to a double-sided display stand, and relates to the technical field of merchandise display equipment, and the display stand comprises a base, and further comprises a display mechanism, wherein the display mechanism comprises a support plate, the outer wall of the support plate is provided with a plugboard, the top end outer wall of the support plate is fixedly connected with a top surface fixing plate, the top end outer wall of the support plate is detachably provided with a laminate and a hanging rod, the top end outer wall of the top surface fixing plate is provided with a top surface connecting frame, the outer wall of the top surface connecting frame is fixedly connected with a top surface frame a, and the outer wall of the top surface frame a is detachably provided with a top surface frame B. The plastic spraying process adopted in the surface corrosion prevention treatment of the metal display rack in the prior art has the defects that the wear resistance of the coating is poor, pores are easy to generate in the coating, water vapor and corrosive medium easily permeate to the surface of a metal substrate through the pores to cause corrosion of the substrate, the coating is further caused to fall off, the binding force between the coating and the substrate is insufficient, the coating thickness is uneven, the defects of orange peel, bubbles and the like are easy to occur, and the plastic spraying process is difficult to adapt to the use scene of frequent friction and long-term exposure of the display rack. Disclosure of Invention In order to solve the problems, the invention provides a high wear-resistant compact coating plastic spraying process for a display rack, which comprises the following operation steps: S1, preprocessing a base material, namely selecting a cold-rolled steel plate with the thickness of 2.0mm, and sequentially carrying out oil removal, rust removal, phosphating, water washing and drying treatment; s2, spraying plastic on the bottom layer, namely uniformly spraying modified epoxy resin plastic powder on the surface of the pretreated substrate in an electrostatic plastic spraying mode to form a bottom layer coating, wherein the spraying parameters are that the voltage of a spray gun is 65-75kV, the distance between the spray gun and the substrate is 180-220mm, the powder spraying amount is 90-110kg/min, the spraying pressure is 0.4-0.6MPa, and the thickness of the bottom layer coating is 30-40 mu m; S3, the bottom layer is solidified, namely the sprayed base material is sent into a solidifying furnace to be solidified by section heating, the first section is heated to 120-130 ℃, the temperature is kept for 6-12min, the second section is heated to 160-170 ℃, the temperature is kept for 15-25min, the third section is heated to 175-185 ℃ and the temperature is kept for 10-20min, and the base material is cooled to room temperature after solidification, wherein the cooling speed is 5-8 ℃ per min; S4, spraying the surface layer with the modified polyester spraying powder uniformly on the su