A waterproof tray

Abstract

The application discloses a waterproof tray, which comprises a waterproof tray body and a nano composite ceramic coating covering the inner surface of the waterproof tray body; the waterproof tray is prepared by the following method: after sand blasting polishing treatment is performed on the inner surface of the waterproof tray body, primer, spot paint and topcoat are sprayed on the inner surface of the waterproof tray body in sequence, and then baking and curing are performed to obtain the waterproof tray; the primer, the spot paint and the topcoat all comprise nano ceramic composite coating. The surface of the waterproof tray is covered with the nano composite ceramic coating, so that the product surface has higher coating film hardness, better weather resistance, excellent chemical corrosion resistance, and the waterproof tray has various comprehensive performances, such as wear resistance, hardness, weather resistance, slip resistance, quick drying, chemical corrosion resistance and easy cleaning, and the waterproof tray is more beautiful and convenient to construct and saves materials.

Description

[0001] This application is a divisional application of the invention patent application with application number 2018107194881, application date July 2, 2018, and invention name "a waterproof tray and its preparation method". TECHNICAL FIELD

[0002] The present application relates to the technical field of bathroom product manufacturing, in particular to a waterproof tray. BACKGROUND

[0003] Sheet molding compound (SMC) is a resin paste mixed from unsaturated polyester resin, low shrinkage additive, filler, curing agent, thickening agent, release agent and glass fiber, etc., impregnated with chopped fiber roving or glass fiber mat, made into a sheet by sheet molding compound sheeting machine, and coated with polyethylene or polypropylene film on both sides, wound up, then thickened to a non-sticky state for molding. Sheet molding compound is a molding compound for dry manufacturing of fiber reinforced plastics developed in the 1960s, first appearing in Europe, followed by the United States and Japan, etc. After 40 years of development, sheet molding compound molding process has gradually developed into the most mature and widely used process in the field of composite materials. It has low shrinkage, high strength, easy molding, etc., and its mechanical properties can be comparable to some metal materials, so it is widely used in vehicle shells, pressure pads, bath tubs, purification tanks, switch housings, protective plates, etc.

[0004] With the improvement of people's living standards, people have higher and higher requirements for bathroom products, especially in terms of wear resistance, scratch resistance, color, etc. In the prior art, the waterproof tray made of pure SMC material is not wear-resistant, scratch-resistant, has insufficient strength and toughness, and has single color without hierarchical color tone change. SUMMARY

[0005] Therefore, in order to overcome the defects of the prior art, one of the purposes of the present application is to provide a waterproof tray with wear resistance, high hardness, weather resistance, slip resistance, fast drying, chemical corrosion resistance, easy cleaning and aesthetic appearance.

[0006] In order to achieve the above purpose, the present application adopts the following technical solutions:

[0007] A waterproof tray comprises a waterproof tray body and a nanocomposite ceramic coating covering the inner surface of the waterproof tray body, the nanocomposite ceramic coating comprises, from bottom to top, a primer layer, a spot coating layer and a topcoat layer, the primer layer, the spot coating layer and the topcoat layer are formed by spraying primer, spot coating and topcoat respectively. The thickness of the nanocomposite ceramic coating is 30-50 μm. Preferably, the thickness of the nanocomposite ceramic coating is 35 μm.

[0008] The primer, the spot coating and the topcoat each comprise a nanoceramic composite coating, the nanoceramic composite coating comprises an inorganic resin and a pigment filler, the mass ratio of the pigment filler to the inorganic resin is 1:1-3. The primer layer, the spot coating layer and the topcoat layer differ in color and pigment filler.

[0009] The thickness of the primer layer and the topcoat layer is 10-25 μm. Preferably, the thickness of the primer layer is greater than that of the topcoat layer, the thickness of the primer layer is 20 μm, and the thickness of the topcoat layer is 15 μm.

[0010] The pigment filler comprises color powder and filler, the mass ratio of the color powder to the filler is 1:2-4, the filler comprises talc, calcium carbonate and kaolin, and the mass ratio of the talc, the calcium carbonate and the kaolin is 1-3:4-6:1.

[0011] The nanoceramic composite coating comprises the following components in parts by weight:

[0012] Deionized water 5-15 parts, inorganic resin 70-80 parts, pigment filler 25-70 parts, wetting agent 1-3 parts, dispersant 2-4 parts, defoaming agent 0.5-1.5 parts, film-forming aid 0.5-1.5 parts, leveling agent 1-3 parts, thickening agent 2-4 parts, curing agent 1-3 parts.

[0013] The wetting agent is a polyoxyethylene alkyl ether, the dispersant is an acrylic polymer, the defoaming agent is an oxirane, the leveling agent is a polydimethylsiloxane, the thickening agent is a silicate, and the curing agent is a polytype two-component silicone rubber crosslinking agent.

[0014] The inorganic resin comprises one or more of silica nanosol, titanium dioxide sol or aluminum oxide sol.

[0015] The film-forming aid is a silane coupling agent, and the silane coupling agent is one or more of a methylsilane coupling agent, an ethylsilane coupling agent or a phenylsilane coupling agent.

[0016] The nanosol is used as a carrier and the silane coupling agent is used as a medium, which effectively reduces the clustering phenomenon between the nanoparticles and enables the nanoparticles to play a more full role.

[0017] The preparation process of the nano ceramic composite coating includes the following steps:

[0018] 1) Dissolve the weighed dispersant and wetting agent in deionized water, and stir at low speed to mix the solvents uniformly at room temperature;

[0019] 2) Add talcum powder, color powder, calcium carbonate and kaolin in the mixed solution prepared in step 1) in proportion and stir at high speed in a blender to mix the components uniformly to obtain slurry A;

[0020] 3) Mix the inorganic resin with the curing agent and film-forming aid, and stir at high speed in a blender at room temperature to obtain slurry B;

[0021] 4) Mix the slurry A in step 2) and the slurry B in step 3) at room temperature, and grind to the required fineness after uniform high-speed stirring;

[0022] 5) During the stirring process, various additives such as dispersants, defoamers, thickeners and leveling agents are added appropriately according to the viscosity, fineness and bubble number of the nano ceramic composite coating for adjustment;

[0023] 6) Perform performance detection after standing for 24 hours.

[0024] The application further provides a preparation method of the waterproof tray, specifically including the following steps:

[0025] 1) Surface sand blasting: the inner surface of the waterproof tray body is subjected to sand blasting treatment;

[0026] 2) Primer spraying: the primer, diluent and hardener are proportioned according to the mass ratio of 18-22:7-9:1, uniformly stirred, and then sprayed onto the inner surface of the waterproof tray body after sand blasting by using a spray gun;

[0027] 3) Spot paint spraying: after the primer spraying is completed, the spot paint is sprayed when the primer surface on the waterproof tray body is semi-dry after 5-10 minutes; the spot paint, diluent and hardener are proportioned according to the mass ratio of 18-22:7-9:1, uniformly stirred, and then sprayed onto the waterproof tray body covered with the primer by using a spray gun;

[0028] 4) Topcoat spraying: after the spot paint spraying is completed, the topcoat is sprayed when the spot paint surface on the waterproof tray body is semi-dry after 5-10 minutes; the topcoat, diluent and hardener are proportioned according to the mass ratio of 18-22:7-9:1, uniformly stirred, and then sprayed onto the waterproof tray body covered with the spot paint and primer by using a spray gun;

[0029] 5) bake curing: the surface of the waterproof tray body covered with topcoat, spot paint and primer in turn from top to bottom is baked and cured by curing equipment, and then cooled to room temperature to obtain the waterproof tray.

[0030] In the step 1), the inner surface of the waterproof tray body is placed upwardly and obliquely at an angle of 30-60° with the horizontal plane, and the inner surface of the waterproof tray body is sandblasted until the inner surface of the waterproof tray body is completely roughened. After the sandblasting, the residual sand of the inner surface of the waterproof tray body is cleaned by compressed air to ensure that the inner surface of the waterproof tray body is free of oil, water and impurities. The inner surface of the waterproof tray body is horizontally placed after the treatment for spraying. The sand used in this step is 120# brown corundum, the working air pressure is 0.6-0.8 Mpa, and the equipment is a sandblasting machine. The gun head is perpendicular to the surface of the waterproof tray body and is 10-20 mm away from the surface of the waterproof tray body. The surface of the waterproof tray is polished to increase its roughness and increase its adhesion to the paint layer.

[0031] In the step 2), the primer is filtered by a 200-300 mesh filter, and the primer, thinner and hardener are mixed in a mass ratio of 18-22:7-9:1. After stirring, the mixture is poured into the spray bottle of the spray gun. The air pressure of the spray gun is adjusted to 0.6-0.8 Mpa. The mixture of the primer, thinner and hardener is uniformly sprayed onto the surface of the waterproof tray body by a spray gun with a hole diameter of Φ0.8-1.2 mm. The thickness of the paint film is controlled to be 30-50 μm.

[0032] In the step 3), the spot paint is sprayed after 5-10 minutes of the completion of the primer spraying and when the surface of the primer on the waterproof tray body is semi-dry. The spot paint is filtered by a 200-300 mesh filter, and the spot paint, thinner and hardener are mixed in a mass ratio of 18-22:7-9:1. After stirring, the mixture is poured into the spray bottle of the spray gun. The air pressure of the spray gun is adjusted to 0.2-0.3 Mpa. The mixture of the spot paint, thinner and hardener is uniformly sprayed onto the surface of the waterproof tray body covered with the primer by a spray gun with a hole diameter of Φ0.8-1.2 mm. The spraying direction of the spray gun is parallel to the waterproof tray, the height difference is 40-50 cm, and the distance between the spray gun and the waterproof tray body is 100-120 cm. The spray gun is required to move at a uniform speed during spraying, and the size of the spot is basically consistent and uniformly distributed on the surface of the product. The spot paint is sprayed when the surface of the primer is semi-dry after the completion of the primer spraying, so that the spot paint does not embed into the primer due to the soft surface of the primer, and the mutual fusion and penetration between the paint layers are prevented. If the waiting time is too long, the surface of the primer is too dry, and the separation between the spot paint and the primer is too obvious, which leads to the too obvious concave-convex feeling of the final product, affecting the comfort of use.

[0033] The step 4) topcoat spraying: 5-10 minutes after the spot paint spraying is completed, the surface of the waterproof tray body is semi-dry, and then the topcoat is sprayed; the topcoat is filtered by a 200-300 mesh filter, and the mass ratio of the topcoat, the diluent and the hardener is 18-22:7-9:1, and then the mixture is stirred uniformly and poured into the spray pot of the spray gun, the air pressure of the spray gun is adjusted to 0.6-0.8 Mpa, and the mixture of the topcoat, the diluent and the hardener is uniformly sprayed to the surface of the waterproof tray body by the spray gun with a pore size of 0.8-1.2 mm, and the film thickness is controlled to be 30-50 μm. After the spot paint is sprayed, the surface is semi-dry, and then the topcoat is sprayed, so that the topcoat does not embed into each other due to the soft surface of the spot paint, and the mutual fusion and penetration between the paint layers are prevented. If the waiting time is too long, the surface of the spot paint is too dry, and the separation between the topcoat and the spot paint is too obvious, which causes the concave-convex feeling of the final product to be too obvious, and affects the use comfort.

[0034] The step 5) baking and curing: the waterproof tray body with the topcoat, the spot paint and the primer on the surface from top to bottom is placed in an oven for baking and curing, the oven is uniformly heated to 140-150 DEG C within 2h, and then cooled to room temperature after constant temperature baking for 20 min, so that the topcoat is cured into a topcoat layer, the spot paint is cured into a spot paint layer, and the primer is cured into a primer layer, that is, the nano ceramic composite coating is cured into a nano composite ceramic coating, and the waterproof tray is obtained.

[0035] In the above steps, the surface of the primer is semi-dry after the primer is sprayed, and then the spot paint is sprayed,

[0036] The hardener is one or more of methyl silane coupling agent, ethyl silane coupling agent or phenyl silane coupling agent, and the diluent is ethylene glycol-ethyl ether type paint thinner.

[0037] Compared with the prior art, the waterproof tray of the present application has the following advantages: the surface of the waterproof tray is covered with a nano composite ceramic coating, which is formed by a nano composite ceramic coating. The nano composite ceramic coating has the flexibility of organic resin and the high hardness characteristics of inorganic resin, which is comparable to the convenience of traditional coating construction, and also gives the coating film high hardness and weather resistance. The addition of inorganic resin of nano sol in the nano composite ceramic coating makes the product surface have higher coating film hardness, better weather resistance and excellent chemical corrosion resistance. The cured coating surface has good slip resistance and hydrophobicity similar to the lotus leaf surface effect, easy cleaning and other characteristics, and is convenient to construct and saves materials, is environmentally friendly and non-toxic, can significantly improve the wear resistance, hardness, weather resistance, slip resistance, quick drying, chemical corrosion resistance, easy cleaning and other comprehensive performance of the waterproof tray, and can change the color of the nano composite ceramic coating by adding color fillers, so that the waterproof tray is more beautiful. DETAILED DESCRIPTION

[0038] In order to make the technical scheme of the present application better understood by those skilled in the art, the technical scheme in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work should fall within the scope of protection of the present application.

[0039] Embodiment one: preparation of nanoceramic composite coating

[0040] The nanoceramic composite coating includes the following components by weight:

[0041] The raw materials include 10 parts of deionized water, 75 parts of inorganic resin, 40 parts of pigment and filler, 2 parts of wetting agent, 3 parts of dispersant, 1 part of defoaming agent, 1 part of film-forming aid, 2 parts of leveling agent, 3 parts of thickening agent, 1-3 parts of curing agent, etc.

[0042] The inorganic resin in the embodiment mainly includes silica nanosol, the wetting agent is polyoxyethylene alkyl ether, the dispersant is acrylic polymer, the defoaming agent is ethylene oxide, the film-forming aid is silane coupling agent (KH-550), the leveling agent is polydimethylsiloxane, the thickening agent is silicate, and the curing agent is polytype two-component silicone rubber crosslinking agent (RTV-2).

[0043] The preparation process of the silica nanosol is as follows: tetraethyl orthosilicate is dissolved in anhydrous ethanol, and an ethanol solution of tetraethyl orthosilicate is obtained by stirring in a cold water bath; ammonia water is dissolved in ethanol and stirred to obtain an ethanol solution of ammonia water; the ethanol solution of ammonia water is added to the ethanol solution of tetraethyl orthosilicate, stirred and heated to 50-70℃, and kept at this temperature for 4-8h; fluorocarbon surfactant and compound surfactant are added and stirred uniformly to obtain silica nanosol.

[0044] The nanosol is used as a carrier and the silane coupling agent is used as a medium, which effectively reduces the clustering phenomenon between the nanoparticles, so that the nanoparticles can play a more full role, and the coating prepared by the nanoceramic composite coating is more wear-resistant, corrosion-resistant and aging-resistant.

[0045] The preparation process of the nanoceramic composite coating includes the following steps:

[0046] 1) The weighed dispersant and wetting agent are dissolved in deionized water, and stirred at a speed of 80r / min for 10min to uniformly mix the solvents at room temperature;

[0047] 2) In step 1), talc, color powder, calcium carbonate and kaolin were added in proportion and stirred in sequence at a stirring speed of 200 r / min for 30 min to make the components fully mixed and uniform, to obtain slurry A;

[0048] 3) The inorganic resin was mixed with a curing agent and a film-forming aid, and stirred at a stirring speed of 150 r / min, and the preparation process was carried out at room temperature of 15-30°C, to obtain slurry B;

[0049] 4) Slurry A in step 2) and slurry B in step 3) were mixed at a mass ratio of 1:2 at room temperature, and after being stirred uniformly at a stirring speed of 150 r / min, they were ground to a fineness of ≤25 μm;

[0050] 5) During stirring, various aids were added and adjusted according to the viscosity, fineness, bubble number and the like of the nano ceramic composite coating, and in this embodiment, dispersants, defoamers, thickening agents, leveling agents and the like were added in the above proportions;

[0051] 6) After standing for 24 h, performance detection was carried out.

[0052] Example Two

[0053] An unsaturated polyester resin SMC waterproof tray with a thickness of 4 mm was used as a base plate, and the following steps were performed:

[0054] 1. The surface of the waterproof tray was not sandblasted

[0055] In this embodiment, the surface of the waterproof tray was ensured to be dry, free of stains and impurities and the like.

[0056] 2. Preparation of paint:

[0057] A. Proportion (mass ratio):

[0058] Primer (red): diluent: hardener = 18:7:1, color powder is red color powder;

[0059] Spot paint (black + white): diluent: hardener = 18:7:1, color powder is black and white color powder;

[0060] Topcoat (transparent varnish): diluent: hardener = 18:7:1, no color powder;

[0061] The hardener is a methyl silane coupling agent, and the diluent is a glycol-ethyl ether type paint thinner.

[0062] B. Spraying sequence: primer - spot paint - topcoat, and after each spraying, the spray gun was repeatedly cleaned with acetone.

[0063] 3. Surface spraying:

[0064] Primer spraying: The primer is filtered with a 200-300 mesh filter, and is proportioned according to a mass ratio of primer, thinner, and hardener of 18:7:1. After being stirred uniformly, the mixture is poured into a spray bottle of a spray gun, the air pressure of the spray gun is adjusted to 0.6-0.8 Mpa, and the mixture of primer, thinner, and hardener is uniformly sprayed onto the surface of the waterproof tray body by using a spray gun with a hole diameter of Φ0.8-1.2 mm, and the film thickness is controlled to be 30-50 μm.

[0065] Spot paint spraying: After 5-10 minutes of completion of the primer spraying, the spot paint is sprayed when the primer surface on the waterproof tray body is semi-dry; the spot paint is filtered with a 200-300 mesh filter, and is proportioned according to a mass ratio of spot paint, thinner, and hardener of 18:7:1. After being stirred uniformly, the mixture is poured into a spray bottle of a spray gun, the air pressure of the spray gun is adjusted to 0.2-0.3 Mpa, and the mixture of spot paint, thinner, and hardener is uniformly sprayed onto the surface of the waterproof tray body covered with primer by using a spray gun with a hole diameter of Φ0.8-1.2 mm. During the spraying, the spraying direction of the spray gun is parallel to the waterproof tray, the height difference is 40-50 cm, the distance between the spray gun and the waterproof tray body is 100-120 cm, and the spray gun is required to be moved at a uniform speed during the spraying. The spot size is basically consistent and uniformly distributed on the surface of the product. In this embodiment, the spot diameter is controlled to be 0.5-1 mm. The density is 40-60 pieces / dm 2 .

[0066] Topcoat spraying: After 5-10 minutes of completion of the spot paint spraying, the topcoat is sprayed when the spot paint surface on the waterproof tray body is semi-dry; the topcoat is filtered with a 200-300 mesh filter, and is proportioned according to a mass ratio of topcoat, thinner, and hardener of 18:7:1. After being stirred uniformly, the mixture is poured into a spray bottle of a spray gun, the air pressure of the spray gun is adjusted to 0.6-0.8 Mpa, and the mixture of topcoat, thinner, and hardener is uniformly sprayed onto the surface of the waterproof tray body by using a spray gun with a hole diameter of Φ0.8-1.2 mm. The film thickness is controlled to be 30-50 μm.

[0067] 4. Baking and curing:

[0068] The waterproof tray body after the spraying is sent into an oven, the oven is uniformly heated to 140-150 °C within 2 h, and is cooled to room temperature after being kept at a constant temperature for 20 min.

[0069] The thickness of the nano-composite ceramic coating on the waterproof tray body is about 35 μm, and the thickness of the primer layer is greater than that of the topcoat layer.

[0070] Example Three

[0071] An unsaturated polyester resin SMC waterproof tray with a thickness of 4 mm is used as a base plate, and the following steps are performed:

[0072] 1. Sandblasting treatment of the surface of the waterproof tray:

[0073] The inner surface of the waterproof tray body is placed upward at 45°, and the inner surface is sandblasted and polished. When sandblasting, the gun head rotates clockwise at a uniform speed and moves from left to right until the inner surface of the waterproof tray body is completely polished rough, and after polishing, the surface residual sand is cleaned with compressed air to ensure that the surface is free of oil, water, dry, free of stains and other impurities. After the inner surface of the waterproof tray body is treated, it is placed horizontally for spraying. The sand used in this embodiment is 120# brown corundum, the working air pressure is 0.6-0.8Mpa, and the equipment is a sandblasting machine, the gun head of which is perpendicular to the surface of the waterproof tray body at a distance of 10-20mm.

[0074] 2. Preparation of paint:

[0075] A. Proportion (mass ratio):

[0076] Primer (red): diluent: hardener = 18:7:1, color powder is red color powder;

[0077] Spot paint (black point + white point): diluent: hardener = 18:7:1, color powder is black and white color powder;

[0078] Topcoat (transparent varnish): diluent: hardener = 18:7:1, no color powder;

[0079] The hardener is a methyl silane coupling agent, and the diluent is a glycol-ethyl ether type paint thinner.

[0080] B. Spraying sequence: primer-spot paint-topcoat, after each spraying, the spray gun is repeatedly cleaned with acetone.

[0081] 3. Surface spraying:

[0082] Primer spraying: filter the primer with a 200-300 mesh filter, mix the primer, diluent and hardener according to the mass ratio of 18:7:1, pour the mixture into the spray pot of the spray gun after stirring evenly, adjust the air pressure of the spray gun to 0.6-0.8Mpa, and use a spray gun with a hole diameter of Φ0.8-1.2mm to uniformly spray the mixture of primer, diluent and hardener onto the surface of the waterproof tray body, and the film thickness is controlled at 30-50μm.

[0083] Spraying of the spot paint: 5-10 minutes after the primer spraying is completed, the spraying of the spot paint is started when the primer surface on the waterproof tray body is semi-dry; the spot paint is filtered with a 200-300 mesh filter, and is proportioned according to the mass ratio of the spot paint, the diluent and the hardener as 18:7:1, and is stirred uniformly before being poured into the spray pot of the spray gun; the air pressure of the spray gun is adjusted to 0.2-0.3 Mpa, the mixed solution of the spot paint, the diluent and the hardener is uniformly sprayed to the surface of the waterproof tray body covered with the primer by using the spray gun with a hole diameter of Φ0.8-1.2 mm, the spraying direction of the spray gun is parallel to the waterproof tray, the height difference is 40-50 cm, the distance between the spray gun and the waterproof tray body is 100-120 cm, and the spray gun is required to be moved at a uniform speed during the spraying, so that the spot size is basically consistent and uniformly distributed on the product surface. In this embodiment, the spot diameter is controlled to be 0.5-1 mm. The density is 40-60 pieces / dm 2 .

[0084] Spraying of the top paint: 5-10 minutes after the spraying of the spot paint is completed, the spraying of the top paint is started when the spot paint surface on the waterproof tray body is semi-dry; the top paint is filtered with a 200-300 mesh filter, and is proportioned according to the mass ratio of the top paint, the diluent and the hardener as 18:7:1, and is stirred uniformly before being poured into the spray pot of the spray gun; the air pressure of the spray gun is adjusted to 0.6-0.8 Mpa, the mixed solution of the top paint, the diluent and the hardener is uniformly sprayed to the surface of the waterproof tray body by using the spray gun with a hole diameter of Φ0.8-1.2 mm, and the paint film thickness is controlled to be 30-50 μm.

[0085] 4. Baking and curing:

[0086] The waterproof tray body after the spraying is sent into an oven, the oven is uniformly heated to 140-150 °C within 2 h, is kept at a constant temperature for 20 min, and is cooled to room temperature.

[0087] The thickness of the nano-composite ceramic coating on the waterproof tray body is about 35 μm, and the thickness of the primer layer is greater than that of the top paint layer.

[0088] Example Four

[0089] An unsaturated polyester resin SMC waterproof tray with a thickness of 4 mm is used as a base plate, and the following steps are performed:

[0090] 1. Sand blasting treatment of the waterproof tray surface:

[0091] The inner surface of the waterproof tray body is placed upward at 45°, and the inner surface is sand blasted and polished. When sand blasting, the gun head rotates clockwise at a uniform speed and moves from left to right until the inner surface of the waterproof tray body is completely polished rough, and the surface residual sand is cleaned with compressed air after polishing to ensure that the surface is free of oil, water, dry, free of stains and other impurities. The inner surface of the waterproof tray body is treated and horizontally placed for spraying. The sand used in this embodiment is 120# brown corundum, the working air pressure is 0.6-0.8Mpa, and the equipment is a sand blasting machine, and the gun head is perpendicular to the surface of the waterproof tray body at a distance of 10-20mm.

[0092] 2. Preparation of paint:

[0093] A proportion (mass ratio):

[0094] Primer (blue): diluent: hardener = 22:9:1, color powder is blue color powder;

[0095] Spot paint (white + yellow): diluent: hardener = 22:9:1, color powder is yellow and white color powder;

[0096] Topcoat (transparent varnish): diluent: hardener = 22:9:1, no color powder;

[0097] The hardener is an ethyl silane coupling agent, and the diluent is an ethylene glycol-ethyl ether type paint thinner.

[0098] B. Spraying sequence: primer-spot paint-topcoat, and the spray gun is repeatedly cleaned with acetone after each spraying.

[0099] 3. Surface spraying:

[0100] Primer spraying: filter the primer with a 200-300 mesh filter, and mix the primer, diluent and hardener according to the mass ratio of 22:9:1. After stirring uniformly, pour into the spray pot of the spray gun, adjust the air pressure of the spray gun to 0.6-0.8Mpa, and use a spray gun with a hole diameter of Φ0.8-1.2mm to uniformly spray the mixture of primer, diluent and hardener to the surface of the waterproof tray body, and the film thickness is controlled at 30-50μm.

[0101] Spraying of the spot paint: 5-10 minutes after the primer spraying is completed, the spot paint is sprayed when the primer surface on the waterproof tray body is semi-dry. The spot paint is filtered with a 200-300 mesh filter, and the spot paint, thinner and hardener are mixed in a mass ratio of 22:9:1, stirred uniformly, poured into the spray gun, the air pressure of the spray gun is adjusted to 0.2-0.3 Mpa, the spot paint, thinner and hardener are uniformly sprayed to the surface of the waterproof tray body covered with primer by using a spray gun with a 0.8-1.2 mm aperture, the spray gun is parallel to the waterproof tray, the height difference is 40-50 cm, the spray gun is 100-120 cm away from the waterproof tray body, and the spray gun is required to move at a uniform speed, and the spot size is basically consistent and uniformly distributed on the surface of the product. In this embodiment, the spot diameter is controlled to be 0.5-1 mm. The density is 20-40 / dm 2 .

[0102] Spraying of the topcoat: 5-10 minutes after the spot paint spraying is completed, the topcoat is sprayed when the spot paint surface on the waterproof tray body is semi-dry. The topcoat is filtered with a 200-300 mesh filter, and the topcoat, thinner and hardener are mixed in a mass ratio of 22:9:1, stirred uniformly, poured into the spray gun, the air pressure of the spray gun is adjusted to 0.6-0.8 Mpa, the topcoat, thinner and hardener are uniformly sprayed to the surface of the waterproof tray body by using a spray gun with a 0.8-1.2 mm aperture, and the film thickness is controlled to be 30-50 μm.

[0103] 4. Baking and curing:

[0104] The waterproof tray body after spraying is sent into an oven, the oven is uniformly heated to 140-150 °C within 2 hours, and cooled to room temperature after constant temperature for 20 minutes.

[0105] The thickness of the nano-composite ceramic coating on the waterproof tray body is about 35 μm, and the thickness of the primer layer is greater than that of the topcoat layer.

[0106] Example Five

[0107] The thickness of the nano-composite ceramic coating on the waterproof tray body is about 35 μm, and the thickness of the primer layer is greater than that of the topcoat layer.

[0108] 1. Sandblasting treatment of the waterproof tray surface:

[0109] The inner surface of the waterproof tray body is placed upward at 45°, and the inner surface is subjected to sand blasting polishing treatment. When sand blasting, the gun head is rotated clockwise at a uniform speed and moves from left to right until the inner surface of the waterproof tray body is polished rough, and after polishing, the surface residual sand is cleaned with compressed air to ensure that the surface is free of oil, water, dry, free of stains and other impurities. After the inner surface of the waterproof tray body is treated, it is placed horizontally for spraying. The sand used in this embodiment is 120# brown corundum, the working air pressure is 0.6-0.8Mpa, and the equipment is a sand blasting machine, the gun head of which is perpendicular to the surface of the waterproof tray body at a distance of 10-20mm.

[0110] 2. Preparation of paint:

[0111] A. Proportion (mass ratio):

[0112] Primer (green): diluent: hardener = 20:8:1, color powder is green color powder;

[0113] Spot paint (blue + yellow): diluent: hardener = 20:8:1, color powder is yellow and blue color powder;

[0114] Topcoat (transparent varnish): diluent: hardener = 20:8:1, no color powder;

[0115] The hardener is a methylsilane coupling agent and an ethylsilane coupling agent, and the diluent is a glycol-ethyl ether type paint thinner.

[0116] B. Spraying sequence: primer-spot paint-topcoat, after each spraying, the spray gun is repeatedly cleaned with acetone.

[0117] 3. Surface spraying:

[0118] Primer spraying: filter the primer with a 200-300 mesh filter, mix the primer, diluent and hardener according to the mass ratio of 20:8:1, pour the mixture into the spray pot of the spray gun after stirring uniformly, adjust the air pressure of the spray gun to 0.6-0.8Mpa, and use a spray gun with a hole diameter of Φ0.8-1.2mm to uniformly spray the mixture of primer, diluent and hardener onto the surface of the waterproof tray body, the film thickness is controlled at 30-50μm, and the thickness of the last primer layer is 20μm.

[0119] Spraying of the spot paint: 5-10 minutes after the primer spraying is completed, the spot paint is sprayed when the primer surface on the waterproof tray body is semi-dry. The spot paint is filtered with a 200-300 mesh filter, and the spot paint, thinner and hardener are mixed in a mass ratio of 20:8:1, stirred uniformly, poured into the spray gun, the air pressure of the spray gun is adjusted to 0.2-0.3 Mpa, the spot paint, thinner and hardener are uniformly sprayed to the surface of the waterproof tray body covered with primer by using a spray gun with a 0.8-1.2 mm aperture, the spray gun is parallel to the waterproof tray, the height difference is 40-50 cm, the spray gun is 100-120 cm away from the waterproof tray body, and the spray gun is required to move at a uniform speed, and the spot size is basically consistent and uniformly distributed on the product surface. In this embodiment, the spot diameter is controlled to be 0.5-1 mm. The density is 5-10 / dm 2 .

[0120] Spraying of the topcoat: 5-10 minutes after the spot paint spraying is completed, the topcoat is sprayed when the spot paint surface on the waterproof tray body is semi-dry. The topcoat is filtered with a 200-300 mesh filter, and the topcoat, thinner and hardener are mixed in a mass ratio of 20:8:1, stirred uniformly, poured into the spray gun, the air pressure of the spray gun is adjusted to 0.6-0.8 Mpa, the topcoat, thinner and hardener are uniformly sprayed to the surface of the waterproof tray body by using a spray gun with a 0.8-1.2 mm aperture, and the paint film thickness is controlled to be 30-50 μm, and the final thickness of the topcoat layer is 15 μm.

[0121] 4. Baking and curing:

[0122] The waterproof tray body after spraying is sent into an oven, the oven is uniformly heated to 140-150°C within 2 hours, and cooled to room temperature after constant temperature for 20 minutes. The thickness of the nano-composite ceramic coating on the waterproof tray body is 35 μm, and the thickness of the primer layer is greater than that of the topcoat layer, the thickness of the primer layer in this embodiment is 20 μm, and the thickness of the topcoat layer is 15 μm.

[0123] Example Six

[0124] An unsaturated polyester resin SMC waterproof tray with a thickness of 4 mm is used as a base plate, and the following steps are performed:

[0125] 1. Sandblasting treatment of the waterproof tray surface:

[0126] The inner surface of the waterproof tray body is placed upward at 45°, and the inner surface is sand blasted and polished. When sand blasting, the gun head rotates clockwise at a uniform speed and moves from left to right until the inner surface of the waterproof tray body is completely polished rough, and the surface residual sand is cleaned with compressed air after polishing to ensure that the surface is free of oil, water, dry, free of stains and other impurities. The inner surface of the waterproof tray body is treated and horizontally placed for spraying. The sand used in this embodiment is 120# brown corundum, the working air pressure is 0.6-0.8Mpa, and the equipment is a sand blasting machine, and the gun head is perpendicular to the surface of the waterproof tray body at a distance of 10-20mm.

[0127] 2. Preparation of paint:

[0128] A proportion (mass ratio):

[0129] Primer (green): diluent: hardener = 20:8:1, color powder is green color powder;

[0130] Spot paint (blue + yellow): diluent: hardener = 20:8:1, color powder is yellow and blue color powder;

[0131] Topcoat (transparent varnish): diluent: hardener = 20:8:1, no color powder;

[0132] The hardener is a phenyl silane coupling agent, and the diluent is a glycol-ethyl ether type paint thinner.

[0133] B. Spraying sequence: primer-spot paint-topcoat, and the spray gun is repeatedly cleaned with acetone after each spraying.

[0134] 3. Surface spraying:

[0135] Primer spraying: filter the primer with a 200-300 mesh filter, and mix the primer, diluent and hardener according to the mass ratio of 20:8:1. After stirring uniformly, pour the mixture into the spray pot of the spray gun, adjust the air pressure of the spray gun to 0.6-0.8Mpa, and use a spray gun with a hole diameter of Φ0.8-1.2mm to uniformly spray the mixture of primer, diluent and hardener onto the surface of the waterproof tray body, and the film thickness is controlled at 30-50μm.

[0136] Spraying of the spot paint: 5-10 minutes after the primer spraying is completed, the spot paint is sprayed when the primer surface on the waterproof tray body is semi-dry. The spot paint is filtered with a 200-300 mesh filter, and the spot paint, thinner and hardener are mixed at a mass ratio of 20:8:1, stirred uniformly, poured into the spray gun, the air pressure of the spray gun is adjusted to 0.2-0.3 Mpa, the spot paint, thinner and hardener are uniformly sprayed to the surface of the waterproof tray body covered with primer by using a spray gun with a 0.8-1.2 mm aperture, the spray gun is parallel to the waterproof tray, the height difference is 40-50 cm, the spray gun is 100-120 cm away from the waterproof tray body, and the spray gun is required to move at a uniform speed, and the spot size is basically consistent and uniformly distributed on the product surface. In this embodiment, the spot diameter is controlled to be 0.5-1 mm. The density is 5-10 / dm 2 .

[0137] Spraying of the topcoat: 5-10 minutes after the spot paint spraying is completed, the topcoat is sprayed when the spot paint surface on the waterproof tray body is semi-dry. The topcoat is filtered with a 200-300 mesh filter, and the topcoat, thinner and hardener are mixed at a mass ratio of 20:8:1, stirred uniformly, poured into the spray gun, the air pressure of the spray gun is adjusted to 0.6-0.8 Mpa, the topcoat, thinner and hardener are uniformly sprayed to the surface of the waterproof tray body by using a spray gun with a 0.8-1.2 mm aperture, and the film thickness is controlled to be 30-50 μm.

[0138] 4. Baking and curing:

[0139] The waterproof tray body after spraying is sent into an oven, the oven is uniformly heated to 140-150°C within 2 hours, and then cooled to room temperature after constant temperature for 5 minutes.

[0140] The thickness of the nano-composite ceramic coating on the waterproof tray body is about 35 μm, and the thickness of the primer layer is greater than that of the topcoat layer.

[0141] Example Seven

[0142] The waterproof tray with a thickness of 4 mm is used as the base plate, and the following steps are performed:

[0143] 1. Sandblasting treatment of the waterproof tray surface:

[0144] The inner surface of the waterproof tray body is placed upward at 45°, and the inner surface is sand blasted and polished. When sand blasting, the gun head rotates clockwise at a uniform speed and moves from left to right until the inner surface of the waterproof tray body is completely polished rough, and the surface residual sand is cleaned with compressed air after polishing to ensure that the surface is free of oil, water, dry, free of stains and other impurities. The inner surface of the waterproof tray body is treated and horizontally placed for spraying. The sand used in this embodiment is 120# brown corundum, the working air pressure is 0.6-0.8Mpa, and the equipment is a sand blasting machine, and the gun head is perpendicular to the surface of the waterproof tray body at a distance of 10-20mm.

[0145] 2. Preparation of paint:

[0146] A proportion (mass ratio):

[0147] Primer (green): diluent: hardener = 20:8:1, color powder is green color powder;

[0148] Spot paint (blue + yellow): diluent: hardener = 20:8:1, color powder is yellow and blue color powder;

[0149] Topcoat (transparent varnish): diluent: hardener = 20:8:1, no color powder;

[0150] The hardener is a phenyl silane coupling agent, and the diluent is a glycol-ethyl ether type paint thinner.

[0151] B. Spraying sequence: primer-spot paint-topcoat, and the spray gun is repeatedly cleaned with acetone after each spraying.

[0152] 3. Surface spraying:

[0153] Primer spraying: filter the primer with a 200-300 mesh filter, and mix the primer, diluent and hardener according to the mass ratio of 20:8:1. After stirring uniformly, pour the mixture into the spray pot of the spray gun, adjust the air pressure of the spray gun to 0.6-0.8Mpa, and use a spray gun with a hole diameter of Φ0.8-1.2mm to uniformly spray the mixture of primer, diluent and hardener onto the surface of the waterproof tray body, and the film thickness is controlled at 30-50μm.

[0154] Spraying of the spot paint: 5-10 minutes after the primer spraying is completed, the spot paint is sprayed when the primer surface on the waterproof tray body is semi-dry. The spot paint is filtered with a 200-300 mesh filter, and the spot paint, thinner and hardener are mixed at a mass ratio of 20:8:1, stirred uniformly, poured into the spray gun, the air pressure of the spray gun is adjusted to 0.2-0.3 Mpa, the spot paint, thinner and hardener are uniformly sprayed to the surface of the waterproof tray body covered with primer by using a spray gun with a 0.8-1.2 mm aperture, the spray gun is parallel to the waterproof tray, the height difference is 40-50 cm, the spray gun is 100-120 cm away from the waterproof tray body, and the spray gun is required to move at a uniform speed, and the spot size is basically consistent and uniformly distributed on the surface of the product. In this embodiment, the spot diameter is controlled to be 0.5-1 mm. The density is 5-10 / dm 2 .

[0155] Spraying of the topcoat: 5-10 minutes after the spot paint spraying is completed, the topcoat is sprayed when the spot paint surface on the waterproof tray body is semi-dry. The topcoat is filtered with a 200-300 mesh filter, and the topcoat, thinner and hardener are mixed at a mass ratio of 20:8:1, stirred uniformly, poured into the spray gun, the air pressure of the spray gun is adjusted to 0.6-0.8 Mpa, the topcoat, thinner and hardener are uniformly sprayed to the surface of the waterproof tray body by using a spray gun with a 0.8-1.2 mm aperture, and the film thickness is controlled to be 30-50 μm.

[0156] 4. Baking and curing:

[0157] The waterproof tray body after spraying is sent into an oven, the oven is uniformly heated to 140-150°C within 2 hours, and cooled to room temperature after constant temperature for 30 minutes.

[0158] The thickness of the nano-composite ceramic coating on the waterproof tray body is about 35 μm, and the thickness of the primer layer is greater than that of the topcoat layer.

[0159] Example Eight

[0160] An unsaturated polyester resin SMC waterproof tray with a thickness of 4 mm is used as a base plate, and the following steps are performed:

[0161] 1. Sandblasting treatment of the waterproof tray surface:

[0162] The inner surface of the waterproof tray body is placed upward at 45°, and the inner surface is sand blasted and polished. When sand blasting, the gun head rotates clockwise at a uniform speed and moves from left to right until the inner surface of the waterproof tray body is completely polished rough, and the surface residual sand is cleaned with compressed air after polishing to ensure that the surface is free of oil, water, dry, free of stains and other impurities. The inner surface of the waterproof tray body is treated and horizontally placed for spraying. The sand used in this embodiment is 120# brown corundum, the working air pressure is 0.6-0.8Mpa, and the equipment is a sand blasting machine, and the gun head is perpendicular to the surface of the waterproof tray body at a distance of 10-20mm.

[0163] 2. Preparation of paint:

[0164] A proportion (mass ratio):

[0165] Primer (green): diluent: hardener = 20:8:1, color powder is green color powder;

[0166] Spot paint (blue + yellow): diluent: hardener = 20:8:1, color powder is yellow and blue color powder;

[0167] Topcoat (transparent varnish): diluent: hardener = 20:8:1, no color powder;

[0168] The hardener is a phenyl silane coupling agent, and the diluent is a glycol-ethyl ether type paint thinner.

[0169] B. Spraying sequence: primer-spot paint-topcoat, and the spray gun is repeatedly cleaned with acetone after each spraying.

[0170] 3. Surface spraying:

[0171] Primer spraying: filter the primer with a 200-300 mesh filter, and mix the primer, diluent and hardener according to the mass ratio of 20:8:1. After stirring uniformly, pour the mixture into the spray pot of the spray gun, adjust the air pressure of the spray gun to 0.6-0.8Mpa, and use a spray gun with a hole diameter of Φ0.8-1.2mm to uniformly spray the mixture of primer, diluent and hardener onto the surface of the waterproof tray body, and the film thickness is controlled at 30-50μm.

[0172] Spraying of the spot paint: 5-10 minutes after the primer spraying is completed, the spot paint is sprayed when the primer surface on the waterproof tray body is semi-dry. The spot paint is filtered with a 200-300 mesh filter, and the spot paint, thinner and hardener are mixed at a mass ratio of 20:8:1, stirred uniformly, poured into the spray gun, the air pressure of the spray gun is adjusted to 0.2-0.3 Mpa, the spot paint, thinner and hardener are uniformly sprayed to the surface of the waterproof tray body covered with primer by using a spray gun with a 0.8-1.2 mm aperture, the spray gun is parallel to the waterproof tray, the height difference is 40-50 cm, the spray gun is 100-120 cm away from the waterproof tray body, and the spray gun is required to move at a uniform speed, and the spot size is basically consistent and uniformly distributed on the product surface. In this embodiment, the spot diameter is controlled to be 0.5-1 mm. The density is 5-10 / dm 2 .

[0173] Spraying of the topcoat: 5-10 minutes after the spot paint spraying is completed, the topcoat is sprayed when the spot paint surface on the waterproof tray body is semi-dry. The topcoat is filtered with a 200-300 mesh filter, and the topcoat, thinner and hardener are mixed at a mass ratio of 20:8:1, stirred uniformly, poured into the spray gun, the air pressure of the spray gun is adjusted to 0.6-0.8 Mpa, the topcoat, thinner and hardener are uniformly sprayed to the surface of the waterproof tray body by using a spray gun with a 0.8-1.2 mm aperture, and the film thickness is controlled to be 30-50 μm.

[0174] 4. Baking and curing:

[0175] The waterproof tray body after spraying is sent into an oven, the oven is uniformly heated to 110-120°C within 2 hours, and cooled to room temperature after constant temperature for 20 minutes.

[0176] The thickness of the nano-composite ceramic coating on the waterproof tray body is about 35 μm, and the thickness of the primer layer is greater than that of the topcoat layer.

[0177] Example Nine

[0178] The thickness of the nano-composite ceramic coating on the waterproof tray body is about 35 μm, and the thickness of the primer layer is greater than that of the topcoat layer.

[0179] 1. Sandblasting treatment of the waterproof tray surface:

[0180] The inner surface of the waterproof tray body is placed upward at 45°, and the inner surface is sand blasted and polished. When sand blasting, the gun head rotates clockwise at a uniform speed and moves from left to right until the inner surface of the waterproof tray body is completely polished rough, and the surface residual sand is cleaned with compressed air after polishing to ensure that the surface is free of oil, water, dry, free of stains and other impurities. The inner surface of the waterproof tray body is treated and horizontally placed for spraying. The sand used in this embodiment is 120# brown corundum, the working air pressure is 0.6-0.8Mpa, and the equipment is a sand blasting machine, and the gun head is perpendicular to the surface of the waterproof tray body at a distance of 10-20mm.

[0181] 2. Preparation of paint:

[0182] A. Proportion (mass ratio):

[0183] Primer (green): diluent: hardener = 20:8:1, color powder is green color powder;

[0184] Spot paint (blue + yellow): diluent: hardener = 20:8:1, color powder is yellow and blue color powder;

[0185] Topcoat (transparent varnish): diluent: hardener = 20:8:1, no color powder;

[0186] The hardener is a phenyl silane coupling agent, and the diluent is a glycol-ethyl ether type paint thinner.

[0187] B. Spraying sequence: primer-spot paint-topcoat, and the spray gun is repeatedly cleaned with acetone after each spraying.

[0188] 3. Surface spraying:

[0189] Primer spraying: filter the primer with a 200-300 mesh filter, and mix the primer, diluent and hardener according to the mass ratio of 20:8:1. After stirring uniformly, pour the mixture into the spray pot of the spray gun, adjust the air pressure of the spray gun to 0.6-0.8Mpa, and use a spray gun with a hole diameter of Φ0.8-1.2mm to uniformly spray the mixture of primer, diluent and hardener onto the surface of the waterproof tray body, and the film thickness is controlled at 30-50μm.

[0190] Spraying of spot paint: 5-10 minutes after the primer spraying is completed, the spraying of spot paint is started when the primer surface on the waterproof tray body is semi-dried; the spot paint is filtered with a 200-300 mesh filter, and is proportioned according to the mass ratio of spot paint, diluent and hardener as 20:8:1, and is stirred uniformly and then poured into the spray pot of the spray gun, the air pressure of the spray gun is adjusted to 0.2-0.3 Mpa, the mixed solution of spot paint, diluent and hardener is uniformly sprayed to the surface of the waterproof tray body covered with primer by using a spray gun with a hole diameter of 0.8-1.2 mm, the spraying direction of the spray gun is parallel to the waterproof tray, the height difference is 40-50 cm, the distance between the spray gun and the waterproof tray body is 100-120 cm, and the spray gun is required to be moved at a uniform speed during spraying, so that the spot size is basically consistent and uniformly distributed on the product surface. In this embodiment, the spot diameter is controlled to be 0.5-1 mm. The density is 5-10 / dm 2 .

[0191] Spraying of top paint: 5-10 minutes after the spraying of spot paint is completed, the spraying of top paint is started when the spot paint surface on the waterproof tray body is semi-dried; the top paint is filtered with a 200-300 mesh filter, and is proportioned according to the mass ratio of top paint, diluent and hardener as 20:8:1, and is stirred uniformly and then poured into the spray pot of the spray gun, the air pressure of the spray gun is adjusted to 0.6-0.8 Mpa, the mixed solution of top paint, diluent and hardener is uniformly sprayed to the surface of the waterproof tray body by using a spray gun with a hole diameter of 0.8-1.2 mm, and the paint film thickness is controlled to be 30-50 μm.

[0192] 4. Baking and curing:

[0193] The waterproof tray body after spraying is sent into an oven, the oven is uniformly heated to 120-130 °C within 2 h, and is cooled to room temperature after constant temperature for 20 min.

[0194] The thickness of the nano-composite ceramic coating on the waterproof tray body is about 35 μm, and the thickness of the primer layer is greater than that of the top paint layer.

[0195] Example Ten

[0196] An unsaturated polyester resin SMC waterproof tray with a thickness of 4 mm is used as a base plate, and the following steps are performed:

[0197] 1. Sandblasting treatment of the surface of the waterproof tray:

[0198] The inner surface of the waterproof tray body is placed upward at 45°, and the inner surface is sand blasted and polished. When sand blasting, the gun head rotates clockwise at a uniform speed and moves from left to right until the inner surface of the waterproof tray body is completely polished rough, and the surface residual sand is cleaned with compressed air after polishing to ensure that the surface is free of oil, water, dry, free of stains and other impurities. The inner surface of the waterproof tray body is treated and horizontally placed for spraying. The sand used in this embodiment is 120# brown corundum, the working air pressure is 0.6-0.8Mpa, and the equipment is a sand blasting machine, and the gun head is perpendicular to the surface of the waterproof tray body at a distance of 10-20mm.

[0199] 2. Preparation of paint:

[0200] A proportion (mass ratio):

[0201] Primer (green): diluent: hardener = 20:8:1, color powder is green color powder;

[0202] Spot paint (blue + yellow): diluent: hardener = 20:8:1, color powder is yellow and blue color powder;

[0203] Topcoat (transparent varnish): diluent: hardener = 20:8:1, no color powder;

[0204] The hardener is a phenyl silane coupling agent, and the diluent is a glycol-ethyl ether type paint thinner.

[0205] B. Spraying sequence: primer-spot paint-topcoat, and the spray gun is repeatedly cleaned with acetone after each spraying.

[0206] 3. Surface spraying:

[0207] Primer spraying: filter the primer with a 200-300 mesh filter, and mix the primer, diluent and hardener according to the mass ratio of 20:8:1. After stirring uniformly, pour the mixture into the spray pot of the spray gun, adjust the air pressure of the spray gun to 0.6-0.8Mpa, and use a spray gun with a hole diameter of Φ0.8-1.2mm to uniformly spray the mixture of primer, diluent and hardener onto the surface of the waterproof tray body, and the film thickness is controlled at 30-50μm.

[0208] Spraying of the spot paint: 5-10 minutes after the primer spraying is completed, the spraying of the spot paint is started when the primer surface on the waterproof tray body is semi-dry; the spot paint is filtered by a 200-300 mesh filter, and is proportioned according to the mass ratio of the spot paint, the diluent and the hardener as 20:8:1, and is stirred uniformly and then poured into the spray pot of the spray gun, the air pressure of the spray gun is adjusted to 0.2-0.3 Mpa, the spot paint, the diluent and the hardener are uniformly sprayed to the surface of the waterproof tray body covered with the primer by the spray gun with a hole diameter of 0.8-1.2 mm, the spraying direction of the spray gun is parallel to the waterproof tray, the height difference is 40-50 cm, the distance between the spray gun and the waterproof tray body is 100-120 cm, the spray gun is required to be moved at a uniform speed during the spraying, and the spot size is basically consistent and uniformly distributed on the surface of the product. In this embodiment, the spot diameter is controlled to be 0.5-1 mm. The density is 5-10 / dm 2 .

[0209] Spraying of the top paint: 5-10 minutes after the spraying of the spot paint is completed, the spraying of the top paint is started when the spot paint surface on the waterproof tray body is semi-dry; the top paint is filtered by a 200-300 mesh filter, and is proportioned according to the mass ratio of the top paint, the diluent and the hardener as 20:8:1, and is stirred uniformly and then poured into the spray pot of the spray gun, the air pressure of the spray gun is adjusted to 0.6-0.8 Mpa, the top paint, the diluent and the hardener are uniformly sprayed to the surface of the waterproof tray body by the spray gun with a hole diameter of 0.8-1.2 mm, and the film thickness is controlled to be 30-50 μm.

[0210] 4. Baking and curing:

[0211] The waterproof tray body after the spraying is sent into an oven, the oven is uniformly heated to 130-140 ℃ within 2 h, and is cooled to room temperature after being kept at a constant temperature for 20 min.

[0212] The thickness of the nano-composite ceramic coating on the waterproof tray body is about 35 μm, and the thickness of the primer layer is greater than that of the top paint layer.

[0213] Test and discussion of example eleven

[0214] 1) The waterproof trays prepared by different preparation methods in examples two to ten are detected, the Barcol hardness, the acid resistance test, the alkali resistance test, the wear resistance test, the heat resistance test A, the heat resistance test B are tested according to GB / T 13095-2008, the grid test is tested according to GB / T 9286-1998, the high-low temperature test is tested according to GB / T 2423.2-2008, the anti-skid test is tested according to DIN 51130, and the specific detection results are as follows:

[0215] Table 1 comparison table of test results of spraying examples

[0216]

[0217] Table 1 shows that the waterproof tray after surface sand blasting treatment and coating combination is obviously better than the combination of the waterproof tray without treatment, the curing effect is best when the proportion (mass ratio) of primer / scattering point paint / topcoat: diluent: hardener = 20:8:1, and the curing effect after baking at 140-150℃ for 20min is obviously better than the curing effect at 110-120℃ or baking for less than 20min. The waterproof tray prepared in Example Five has the best effect in terms of comprehensive test indicators, especially hardness, acid and alkali corrosion resistance and wear resistance.

[0218] 2) The waterproof tray with nano composite ceramic coating prepared in Example Five and the ordinary waterproof tray without coating were detected, and the test data are as follows:

[0219] Table 2 Comparison test table of coating performance

[0220]

[0221] Table 2 shows that the waterproof tray with nano composite ceramic coating has better indicators than the ordinary waterproof tray without coating, especially in terms of hardness, acid and alkali corrosion resistance, wear resistance and the like.

[0222] The surface of the waterproof tray of the present application is covered with a nano composite ceramic coating, which is formed by a nano composite ceramic coating. The nano composite ceramic coating has both the flexibility of organic resin and the high hardness characteristics of inorganic resin, and has the same construction convenience as traditional coatings, and also has high hardness and weather resistance of the coating film. The inorganic resin in the nano composite ceramic coating is added with nano sol, so that the product surface has higher coating film hardness, better weather resistance and excellent chemical corrosion resistance. The surface of the cured coating has good slip resistance and hydrophobicity similar to the surface effect of a lotus leaf, and has the characteristics of easy cleaning of stains, convenient construction, saving of materials, environmental protection and non-toxicity, which can significantly improve the wear resistance, hardness, weather resistance, slip resistance, quick drying, chemical corrosion resistance, easy cleaning and other comprehensive properties of the waterproof tray, and can change the color of the nano composite ceramic coating by adding pigments and fillers, so that the waterproof tray is more beautiful.

[0223] The above examples are only for illustrating the technical concept and characteristics of the present application, the purpose is to enable those skilled in the art to understand the content of the present application and to implement it, and cannot limit the protection scope of the present application, any equivalent changes or modifications made according to the spirit and essence of the present application should be covered within the protection scope of the present application.

Claims

1. A waterproofing tray, characterized in that, The waterproof tray comprises a waterproof tray body and a nano composite ceramic coating covering the inner surface of the waterproof tray body; The waterproof tray is prepared by the following method: After sand blasting and polishing the inner surface of the waterproof tray body, the inner surface of the waterproof tray body is successively sprayed with a primer, a spot paint and a topcoat, and then baked and cured to obtain the waterproof tray. The primer, the spot paint and the topcoat all comprise a nano ceramic composite coating. The nano composite ceramic coating comprises a primer layer, a spot paint layer and a topcoat layer from bottom to top, and the primer layer, the spot paint layer and the topcoat layer are formed by spraying the primer, the spot paint and the topcoat respectively. The nano ceramic composite coating comprises the following components by weight: deionized water 5-15 parts, inorganic resin 70-80 parts, color filler 25-70 parts, wetting agent 1-3 parts, dispersing agent 2-4 parts, defoaming agent 0.5-1.5 parts, film-forming aid 0.5-1.5 parts, leveling agent 1-3 parts, thickening agent 2-4 parts, and curing agent 1-3 parts; the mass ratio of the color filler to the inorganic resin is 1:1-3. The inorganic resin comprises a nano sol, and the film-forming aid is a silane coupling agent; the nano sol is used as a carrier, and the silane coupling agent is used as a medium to reduce the clustering phenomenon between nano sol particles. During the preparation of the waterproof tray, the spot paint is sprayed after the primer is sprayed and the surface of the primer is semi-dried, and the topcoat is sprayed after the spot paint is sprayed and the surface of the spot paint is semi-dried.

2. The flashing pan of claim 1, wherein, During the spraying of the primer, the spot paint and the topcoat, the mass ratio of the primer or the spot paint or the topcoat, the diluent and the hardener is 18-22:7-9:

1.

3. The flashing pan of claim 1, wherein, The sand blasting and polishing treatment is performed by placing the inner surface of the waterproof tray body upwardly and obliquely, and the waterproof tray body forms an angle of 30-60° with the horizontal plane, and then the inner surface of the waterproof tray body is subjected to sand blasting and polishing treatment.

4. The flashing pan of claim 3, wherein, During the sand blasting and polishing, the sand blasting gun head is rotated clockwise and moved from left to right until the inner surface of the waterproof tray body is completely polished rough, and then the residual sand on the inner surface of the waterproof tray body is cleaned to ensure that the inner surface of the waterproof tray body is free of oil, water and impurities.

5. The flashing pan of claim 1, wherein, The primer is sprayed by stirring the primer, the diluent and the hardener uniformly and then spraying them uniformly onto the inner surface of the waterproof tray body after sand blasting and polishing.

6. The flashing pan of claim 5, wherein, The primer is sprayed by filtering the primer through a 200-300 mesh filter, mixing the primer, the diluent and the hardener in a mass ratio of 18-22:7-9:1, stirring them uniformly, pouring them into the spray pot of the spray gun, adjusting the air pressure of the spray gun to 0.6-0.8 Mpa, and then spraying the mixture of the primer, the diluent and the hardener uniformly onto the surface of the waterproof tray body by using a spray gun with a bore diameter of Φ0.8-1.2 mm, and the film thickness is controlled to be 30-50 μm.

7. The flashing pan of claim 1, wherein, The spot paint is sprayed by spraying the spot paint 5-10 minutes after the primer is sprayed and the surface of the primer on the waterproof tray body is semi-dried, and then spraying the spot paint uniformly onto the waterproof tray body covered with the primer by stirring the spot paint, the diluent and the hardener uniformly and then spraying them uniformly.

8. The flashing pan of claim 7, wherein, The spot paint spraying is as follows: after the primer spraying is finished for 5-10 minutes, the spot paint is sprayed when the primer surface on the waterproof tray body is semi-dry; the spot paint is filtered by a 200-300 mesh filter, and is proportioned according to the mass ratio of the spot paint, the diluent and the hardener as 18-22:7-9:1, is stirred uniformly, is poured into a spray pot of a spray gun, the air pressure of the spray gun is adjusted to 0.2-0.3 Mpa, the mixed solution of the spot paint, the diluent and the hardener is uniformly sprayed to the surface of the waterproof tray body covered with the primer by using a spray gun with a pore diameter of Φ0.8-1.2 mm, the spraying direction of the spray gun is parallel to the waterproof tray body, the height difference is 40-50 cm, the spray gun is 100-120 cm away from the waterproof tray body, and the spray gun is moved at a uniform speed during spraying.

9. The flashing pan of claim 1, wherein, The topcoat paint spraying is as follows: after the spot paint spraying is finished for 5-10 minutes, the topcoat paint is sprayed when the spot paint surface on the waterproof tray body is semi-dry; the topcoat paint, the diluent and the hardener are stirred uniformly, and are uniformly sprayed on the waterproof tray body covered with the spot paint and the primer by using a spray gun.

10. The flashing pan of claim 9, wherein, The topcoat paint spraying is as follows: after the spot paint spraying is finished for 5-10 minutes, the topcoat paint is sprayed when the spot paint surface on the waterproof tray body is semi-dry; the topcoat paint is filtered by a 200-300 mesh filter, and is proportioned according to the mass ratio of the topcoat paint, the diluent and the hardener as 18-22:7-9:1, is stirred uniformly, is poured into a spray pot of a spray gun, the air pressure of the spray gun is adjusted to 0.6-0.8 Mpa, the mixed solution of the topcoat paint, the diluent and the hardener is uniformly sprayed to the surface of the waterproof tray body by using a spray gun with a pore diameter of Φ0.8-1.2 mm, and the paint film thickness is controlled to be 30-50 μm.

11. The flashing pan of claim 1, wherein, The baking and curing is as follows: the waterproof tray body with the surface sequentially covered with the topcoat paint, the spot paint and the primer is placed into an oven for baking and curing, the oven is uniformly heated to 110-150 ℃ within 2 hours, and is cooled to room temperature after constant temperature baking for 5-30 minutes.

12. The flashing pan of claim 2, wherein, The hardener is one or more of a methyl silane coupling agent, an ethyl silane coupling agent and a phenyl silane coupling agent; and the diluent is an ethylene glycol-ethyl ether type paint thinner.

13. The flashing pan of claim 1, wherein, The inorganic resin comprises one or more of a silicon dioxide nano sol, a titanium dioxide sol and an aluminum oxide sol; and the silane coupling agent is one or more of a methyl silane coupling agent, an ethyl silane coupling agent and a phenyl silane coupling agent.

14. The flashing pan of claim 1, wherein, The color filler comprises color powder and filler, the mass ratio of the color powder and the filler is 1:2-4, the filler comprises talc, calcium carbonate and kaolin, and the mass ratio of the talc, the calcium carbonate and the kaolin is 1-3:4-6:

1.

15. The flashing pan of claim 1, wherein, The wetting agent is a polyoxyethylene alkyl ether, the dispersing agent is an acrylic polymer, the defoaming agent is an ethylene oxide substance, the leveling agent is a polydimethylsiloxane, the thickening agent is a silicate substance, and the curing agent is a polytype two-component silicone rubber crosslinking agent.

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