Nano-ceramic composite coating and preparation method thereof and waterproof disk

Abstract

The invention discloses a nano-ceramic composite coating, which comprises the following components by weight: 5-15 parts of deionized water, 70-80 parts of inorganic resin, 25-70 parts of pigments and fillers, 1-3 parts of wetting agents, 2-4 parts of dispersants, 0.5-1.5 parts of defoamers, 0.5-1.5 parts of film-forming aids, 1-3 parts of leveling agents, 2-4 parts of thickeners, and 1-3 parts of curing agents; the mass ratio of the pigments and fillers to the inorganic resin is 1:1-3. The nano-composite ceramic coating of the invention, with the inorganic resin of nano-sol added, enables the product surface to obtain higher coating hardness, better weather resistance, and excellent chemical corrosion resistance, and is convenient for construction and material saving, environmentally friendly and non-toxic, and can significantly improve the various comprehensive properties of the waterproof plate, such as wear resistance, hardness, weather resistance, anti-skid, quick drying, chemical corrosion resistance, and easy cleaning, and can change the color of the nano-composite ceramic coating by adding pigments and fillers, so that the waterproof plate is more beautiful.

Description

[0001] This application is a divisional application of the invention patent application with application date of July 2, 2018, application number 2018107194881, and invention name “A waterproof tray and its preparation method”. Technical Field

[0002] The invention relates to the technical field of composite coatings and sanitary ware product manufacturing, and in particular to a nano-ceramic composite coating, a preparation method of the nano-ceramic composite coating, and application of the nano-ceramic composite coating in a waterproof tray. Background Art

[0003] Sheet Molding Compound (SMC) is a resin paste made of unsaturated polyester resin, low shrinkage additives, fillers, curing agents, thickeners, release agents and glass fibers, which are impregnated with chopped fiber roving or glass fiber mats, and impregnated with glass fibers by a sheet molding machine to form sheets, which are then wrapped with polyethylene or polypropylene film on both sides, rolled up, and then thickened to a non-sticky state for compression molding. Sheet molding compound is a dry-process fiber-reinforced plastic molding compound developed in the 1960s. It first appeared in Europe, and then the United States and Japan successively developed this process. After more than 40 years of development, the compression molding process of sheet molding compound has gradually developed into the most mature and widely used process in the field of composite materials. It has the characteristics of low shrinkage, high strength, and easy molding. Its mechanical properties are comparable to those of some metal materials. Therefore, it is widely used in vehicle shells, pressure pads, bathtubs and septic tanks in building facilities, switch shells and protective panels in the electronics industry, etc.

[0004] As people's living standards improve, they have higher and higher requirements for bathroom products, especially for the wear resistance, scratch resistance, color and other aspects of bathroom products. However, in the existing technology, the waterproof plate made of pure SMC material is not wear-resistant and scratch-resistant, has insufficient strength and toughness, and has a relatively single color without layered color changes. Summary of the invention

[0005] In view of this, in order to overcome the defects of the prior art, one of the purposes of the present invention is to provide a nano-ceramic composite coating, which can be applied to a waterproof plate to obtain a waterproof plate that is wear-resistant, high hardness, weather-resistant, non-slip, quick-drying, chemical-resistant, easy to clean and beautiful.

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

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

[0008] The primer, sprinkle paint and topcoat all include nano-ceramic composite coatings, which include inorganic resin and pigments, and the mass ratio of the pigments to the inorganic resin is 1:1-3. The primer layer, sprinkle paint layer and topcoat layer differ in color and pigments.

[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 color filler comprises toner and filler, the mass ratio of the toner to the filler is 1:2-4, the filler comprises talcum powder, calcium carbonate and kaolin, the mass ratio of the talcum powder, calcium carbonate and kaolin is 1-3:4-6:1.

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

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

[0013] Among them, the wetting agent is polyoxyethylene alkyl ether, the dispersant is acrylic polymer, the defoaming agent is ethylene oxide, the leveling agent is polydimethylsiloxane, the thickener is silicate, and the curing agent is a poly-type two-component silicone rubber crosslinking agent.

[0014] The inorganic resin includes one or more of silicon dioxide nano sol, 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 methyl silane coupling agent, an ethyl silane coupling agent or a phenyl silane coupling agent.

[0016] Using nanosol as a carrier and silane coupling agent as a medium effectively reduces the clustering phenomenon between nanoparticles, allowing the nanoparticles to play a more full role.

[0017] The preparation process of 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 various solvents evenly at room temperature;

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

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

[0021] 4) mixing the slurry A in step 2) and the slurry B in step 3) at room temperature, stirring at high speed and then grinding to a desired fineness;

[0022] 5) During the stirring process, various additives such as dispersants, defoamers, thickeners, leveling agents, etc. are appropriately added to adjust the viscosity, fineness, number of bubbles, etc. of the nano-ceramic composite coating;

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

[0024] The present invention also provides a method for preparing a waterproof disk, which specifically comprises the following steps:

[0025] 1) Surface sandblasting: The inner surface of the waterproof plate body is sandblasted and polished;

[0026] 2) Primer spraying: mix the primer, diluent and hardener in a mass ratio of 18-22:7-9:1, stir evenly and spray evenly onto the inner surface of the waterproof plate body after sandblasting with a spray gun;

[0027] 3) Spraying of spot paint: 5-10 minutes after the primer is sprayed, when the primer surface on the waterproof plate body is half dry, start spraying the spot paint; mix the spot paint, diluent and hardener in a mass ratio of 18-22:7-9:1, stir evenly and spray it evenly on the waterproof plate body covered with primer with a spray gun;

[0028] 4) Topcoat spraying: 5-10 minutes after the spraying of the sprinkle paint is completed, the topcoat is sprayed when the surface of the sprinkle paint on the waterproof plate body is half dry; the topcoat, diluent and hardener are mixed in a mass ratio of 18-22:7-9:1, stirred evenly and sprayed evenly on the waterproof plate body covered with the sprinkle paint and primer with a spray gun;

[0029] 5) Baking and curing: The waterproof plate body, which is sequentially covered with topcoat, sprinkler paint and primer from top to bottom, is baked and cured by a curing device and then cooled to room temperature to obtain the waterproof plate.

[0030] Wherein: Step 1) Surface sandblasting: Place the inner surface of the waterproof plate body tilted upward, the waterproof plate body is at an angle of 30-60° with the horizontal plane, and the inner surface of the waterproof plate body is sandblasted and polished. The sandblasting gun head rotates clockwise at a constant speed and moves from left to right until the inner surface of the waterproof plate body is completely polished and roughened. After polishing, use compressed air to clean the residual sand on the inner surface of the waterproof plate body to ensure that the inner surface of the waterproof plate body is oil-free, water-free, and impurity-free. After the inner surface of the waterproof plate body is treated, it is placed horizontally for spraying. The sand material used in this step 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 vertical and 10-20mm away from the surface of the waterproof plate body. The roughness of the surface of the waterproof plate is increased by polishing, so as to increase its adhesion to the paint layer.

[0031] The step 2) spraying the primer: filter the primer with a 200-300 mesh filter, mix the primer, diluent and hardener in a mass ratio of 18-22:7-9:1, stir evenly and 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 pore size of Φ0.8-1.2mm to evenly spray the mixture of the primer, diluent and hardener onto the surface of the waterproof disk body, and the paint film thickness is controlled at 30-50μm.

[0032] The step 3) spraying of scattering paint: 5-10 minutes after the primer spraying is completed, start spraying the scattering paint when the primer surface on the waterproof disk body is half dry; filter the scattering paint with a 200-300 mesh filter, mix the scattering paint, diluent and hardener in a mass ratio of 18-22:7-9:1, stir evenly and pour into the spray pot of the spray gun, adjust the air pressure of the spray gun to 0.2-0.3Mpa, and use a spray gun with a pore size of Φ0.8-1.2mm to evenly spray the mixture of scattering paint, diluent and hardener onto the surface of the waterproof disk body covered with the primer. During spraying, the spray direction of the spray gun is parallel to the waterproof disk, the height difference is 40-50cm, and the spray gun is 100-120cm away from the waterproof disk body. During spraying, the spray gun is required to move at a uniform speed, and the scattering points are basically consistent in size and evenly distributed on the product surface. After spraying the primer, you need to wait until the surface is half dry before spraying the sprinkle paint. This will prevent the sprinkle paint from being embedded in the primer due to the primer's soft surface, thus preventing the paint layers from blending and penetrating each other. If the waiting time is too long and the primer's surface is too dry, the separation between the sprinkle paint and the primer will be too obvious, resulting in the final product having a too obvious bumpy feel, affecting the comfort of use.

[0033] The step 4) spraying of topcoat: 5-10 minutes after the spraying of the sprinkled paint is completed, start spraying the topcoat when the sprinkled paint surface on the waterproof disk body is half dry; filter the topcoat with a 200-300 mesh filter, mix the topcoat, diluent and hardener in a mass ratio of 18-22:7-9:1, stir evenly and 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 pore size of Φ0.8-1.2mm to evenly spray the mixture of the topcoat, diluent and hardener onto the surface of the waterproof disk body, and control the paint film thickness to 30-50μm. After spraying the sprinkle paint, you need to wait until the surface is half dry before spraying the topcoat. This will prevent the topcoats from embedding into each other due to the soft surface of the sprinkle paint, thus preventing the paint layers from blending and penetrating each other. If the waiting time is too long, the surface of the sprinkle paint will be too dry, and the separation between the topcoat and the sprinkle paint will be too obvious, resulting in the final product having too obvious bumps and depressions, affecting the comfort of use.

[0034] The step 5) baking and curing: the waterproof plate body whose surface is sequentially covered with topcoat, sprinkle paint and primer from top to bottom is placed in an oven for baking and curing, the oven is heated to 140-150°C at a uniform speed within 2 hours, and the baking is continued at a constant temperature for 20 minutes and then cooled to room temperature, the topcoat is cured into a topcoat layer, the sprinkle paint is cured into a sprinkle 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, to obtain a waterproof plate.

[0035] In the above steps, after spraying the primer, you need to wait until the surface is half dry before spraying the sprinkler paint. After spraying the sprinkler paint, you need to wait until the surface is half dry before spraying the topcoat.

[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-ether paint diluent.

[0037] Compared with the prior art, the benefits of the present invention are as follows: the nano-composite ceramic coating of the present invention forms a nano-composite ceramic coating that takes into account the flexibility of organic resins and the high hardness characteristics of inorganic resins, comparable to the construction convenience of traditional coatings, and gives the coating film high hardness and weather resistance. Because the inorganic resin of nano-sol is added to the nano-composite ceramic coating, the product surface obtains a higher coating hardness, better weather resistance, and excellent chemical corrosion resistance. The surface of the coating after curing is similar to the surface effect of a lotus leaf, with good anti-slip and hydrophobic properties, easy to clean stains, etc., and it is convenient to construct and save materials, environmentally friendly and non-toxic, and can significantly improve the various comprehensive properties of the waterproof plate, such as wear resistance, hardness, weather resistance, anti-slip, quick drying, chemical corrosion resistance, and easy cleaning. The color of the nano-composite ceramic coating can be changed by adding pigments and fillers, making the waterproof plate more beautiful. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0039] Example 1 Preparation of Nano-ceramic Composite Coating

[0040] The nano ceramic composite coating comprises the following components in parts by weight:

[0041] 10 parts of deionized water, 75 parts of inorganic resin, 40 parts of pigments and fillers, 2 parts of wetting agents, 3 parts of dispersants, 1 part of defoaming agents, 1 part of film-forming aids, 2 parts of leveling agents, 3 parts of thickeners, 1-3 parts of curing agents and other raw materials.

[0042] The inorganic resin in this 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 thickener is silicate, and the curing agent is a poly-type two-component silicone rubber crosslinking agent (RTV-2).

[0043] The preparation process of silica nanosol is as follows: dissolve tetraethyl orthosilicate in anhydrous ethanol, and stir in a cold water bath to obtain an ethanol solution of tetraethyl orthosilicate; dissolve ammonia water in ethanol and stir to obtain an ethanol solution of ammonia water; add the ethanol solution of ammonia water to the ethanol solution of tetraethyl orthosilicate, stir and heat to 50-70°C, and keep warm for 4-8h; add a fluorocarbon surfactant and a compound surfactant, stir evenly, and obtain a silica nanosol.

[0044] Using nanosol as a carrier and silane coupling agent as a medium effectively reduces the clustering phenomenon between nanoparticles, allowing the nanoparticles to play a more full role and making the coating prepared by the nano-ceramic composite coating more wear-resistant, corrosion-resistant and aging-resistant.

[0045] The preparation process of nano-ceramic composite coating includes the following steps:

[0046] 1) Dissolve the weighed dispersant and wetting agent in deionized water, and stir at 80 r / min for 10 min to mix the solvents evenly at room temperature;

[0047] 2) adding talcum powder, color powder, calcium carbonate and kaolin in proportion in step 1) in sequence and stirring at a speed of 200 r / min in a stirrer for 30 min to fully mix the components to obtain slurry A;

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

[0049] 4) at room temperature, the slurry A in step 2) and the slurry B in step 3) are mixed in a mass ratio of 1:2, stirred at a speed of 150 r / min, and then ground to a fineness of ≤25 μm;

[0050] 5) During the stirring process, various additives are appropriately added to adjust the viscosity, fineness, number of bubbles, etc. of the nano-ceramic composite coating. In this embodiment, dispersants, defoamers, thickeners, leveling agents, etc. are added according to the above proportions;

[0051] 6) Perform performance test after standing for 24 hours.

[0052] Embodiment 2

[0053] Take the unsaturated polyester resin SMC waterproof plate with a thickness of 4mm as the base material and operate according to the following steps:

[0054] 1. The surface of the waterproof plate is not sandblasted

[0055] The surface of the waterproof plate in this embodiment only needs to be dry and free of defects such as stains and impurities.

[0056] 2. Paint preparation:

[0057] A mixing ratio (mass ratio):

[0058] Primer (red): thinner: hardener = 18:7:1, toner is red;

[0059] Sprinkle paint (black dots + white dots): thinner: hardener = 18:7:1, the toner is black and white toner;

[0060] Topcoat (transparent varnish): thinner: hardener = 18:7:1, colorless powder;

[0061] The hardener is methyl silane coupling agent, and the thinner is ethylene glycol-ether paint thinner.

[0062] B Spraying order: primer - sprinkle paint - topcoat. Clean the spray gun repeatedly with acetone after each spraying.

[0063] 3. Surface spraying:

[0064] Primer spraying: filter the primer with a 200-300 mesh filter, mix the primer, thinner and hardener in a ratio of 18:7:1, stir evenly and 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 Φ0.8-1.2mm aperture to evenly spray the mixture of primer, thinner and hardener onto the surface of the waterproof disk body. The paint film thickness is controlled at 30-50μm.

[0065] Sprinkle paint spraying: 5-10 minutes after the primer spraying is completed, start spraying the sprinkle paint when the primer surface on the waterproof disk body is half dry; filter the sprinkle paint with a 200-300 mesh filter, mix the sprinkle paint, diluent and hardener in a mass ratio of 18:7:1, stir evenly and pour into the spray gun spray pot, adjust the air pressure of the spray gun to 0.2-0.3Mpa, and use a spray gun with a Φ0.8-1.2mm aperture to evenly spray the mixture of sprinkle paint, diluent and hardener onto the surface of the waterproof disk body covered with primer. When spraying, the spray gun spray direction is parallel to the waterproof disk, with a height difference of 40-50cm, and the spray gun is 100-120cm away from the waterproof disk body. When spraying, the spray gun is required to move at a uniform speed, and the sprinkle point size is basically consistent and evenly distributed on the product surface. In this embodiment, the sprinkle point diameter is controlled at Density is 40-60 pieces / dm 2 .

[0066] Topcoat spraying: 5-10 minutes after the spot paint is sprayed, start spraying the topcoat when the spot paint surface on the waterproof disc body is half dry; filter the topcoat with a 200-300 mesh filter, mix the topcoat, thinner and hardener in a mass ratio of 18:7:1, stir evenly and 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 Φ0.8-1.2mm aperture to evenly spray the mixture of topcoat, thinner and hardener onto the surface of the waterproof disc body, and control the paint film thickness to 30-50μm.

[0067] 4. Baking and curing:

[0068] The sprayed waterproof plate body is sent into the oven, and the temperature is uniformly raised to 140-150℃ within 2 hours, kept at the constant temperature for 20 minutes, and then cooled to room temperature.

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

[0070] Embodiment 3

[0071] Take the unsaturated polyester resin SMC waterproof plate with a thickness of 4mm as the base material and operate according to the following steps:

[0072] 1. Sandblasting treatment of waterproof plate surface:

[0073] Place the inner surface of the waterproof plate body upward at 45 degrees, and perform sandblasting and grinding on the inner surface. During sandblasting, the gun head rotates clockwise at a constant speed and moves from left to right until the inner surface of the waterproof plate body is completely polished and roughened. After polishing, use compressed air to clean the residual sand on the surface to ensure that the surface is oil-free, water-free, dry, and free of stains and other impurities. After the inner surface of the waterproof plate 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, the equipment is a sandblasting machine, and its gun head is vertical and 10-20mm away from the surface of the waterproof plate body.

[0074] 2. Paint preparation:

[0075] A mixing ratio (mass ratio):

[0076] Primer (red): thinner: hardener = 18:7:1, toner is red;

[0077] Sprinkle paint (black dots + white dots): thinner: hardener = 18:7:1, the toner is black and white toner;

[0078] Topcoat (transparent varnish): thinner: hardener = 18:7:1, colorless powder;

[0079] The hardener is methyl silane coupling agent, and the thinner is ethylene glycol-ether paint thinner.

[0080] B Spraying order: primer - sprinkle paint - topcoat. Clean the spray gun repeatedly with acetone after each spraying.

[0081] 3. Surface spraying:

[0082] Primer spraying: filter the primer with a 200-300 mesh filter, mix the primer, thinner and hardener in a ratio of 18:7:1, stir evenly and 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 Φ0.8-1.2mm aperture to evenly spray the mixture of primer, thinner and hardener onto the surface of the waterproof disk body. The paint film thickness is controlled at 30-50μm.

[0083] Sprinkle paint spraying: 5-10 minutes after the primer spraying is completed, start spraying the sprinkle paint when the primer surface on the waterproof disk body is half dry; filter the sprinkle paint with a 200-300 mesh filter, mix the sprinkle paint, diluent and hardener in a mass ratio of 18:7:1, stir evenly and pour into the spray gun spray pot, adjust the air pressure of the spray gun to 0.2-0.3Mpa, and use a spray gun with a Φ0.8-1.2mm aperture to evenly spray the mixture of sprinkle paint, diluent and hardener onto the surface of the waterproof disk body covered with primer. When spraying, the spray gun spray direction is parallel to the waterproof disk, with a height difference of 40-50cm, and the spray gun is 100-120cm away from the waterproof disk body. When spraying, the spray gun is required to move at a uniform speed, and the sprinkle point size is basically consistent and evenly distributed on the product surface. In this embodiment, the sprinkle point diameter is controlled at Density is 40-60 pieces / dm 2 .

[0084] Topcoat spraying: 5-10 minutes after the spot paint is sprayed, start spraying the topcoat when the spot paint surface on the waterproof disc body is half dry; filter the topcoat with a 200-300 mesh filter, mix the topcoat, thinner and hardener in a mass ratio of 18:7:1, stir evenly and 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 Φ0.8-1.2mm aperture to evenly spray the mixture of topcoat, thinner and hardener onto the surface of the waterproof disc body, and control the paint film thickness to 30-50μm.

[0085] 4. Baking and curing:

[0086] The sprayed waterproof plate body is sent into the oven, and the temperature is uniformly raised to 140-150℃ within 2 hours, kept at the constant temperature for 20 minutes, and then cooled to room temperature.

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

[0088] Embodiment 4

[0089] Take the unsaturated polyester resin SMC waterproof plate with a thickness of 4mm as the base material and operate according to the following steps:

[0090] 1. Sandblasting treatment of waterproof plate surface:

[0091] Place the inner surface of the waterproof plate body upward at 45 degrees, and perform sandblasting and grinding on the inner surface. During sandblasting, the gun head rotates clockwise at a constant speed and moves from left to right until the inner surface of the waterproof plate body is completely polished and roughened. After polishing, use compressed air to clean the residual sand on the surface to ensure that the surface is oil-free, water-free, dry, and free of stains and other impurities. After the inner surface of the waterproof plate 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, the equipment is a sandblasting machine, and its gun head is vertical and 10-20mm away from the surface of the waterproof plate body.

[0092] 2. Paint preparation:

[0093] A mixing ratio (mass ratio):

[0094] Primer (blue): thinner: hardener = 22:9:1, toner is blue toner;

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

[0096] Topcoat (transparent varnish): thinner: hardener = 22:9:1, colorless powder;

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

[0098] B Spraying order: primer - sprinkle paint - topcoat. Clean the spray gun repeatedly with acetone after each spraying.

[0099] 3. Surface spraying:

[0100] Primer spraying: filter the primer with a 200-300 mesh filter, mix the primer, thinner and hardener in a ratio of 22:9:1, stir evenly and 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 Φ0.8-1.2mm aperture to evenly spray the mixture of primer, thinner and hardener onto the surface of the waterproof disk body. The paint film thickness is controlled at 30-50μm.

[0101] Sprinkle paint spraying: 5-10 minutes after the primer spraying is completed, start spraying the sprinkle paint when the primer surface on the waterproof plate body is half dry; filter the sprinkle paint with a 200-300 mesh filter, mix the sprinkle paint, diluent and hardener in a mass ratio of 22:9:1, stir evenly and pour into the spray gun spray pot, adjust the air pressure of the spray gun to 0.2-0.3Mpa, and use a spray gun with a Φ0.8-1.2mm aperture to evenly spray the mixture of sprinkle paint, diluent and hardener onto the surface of the waterproof plate body covered with primer. When spraying, the spray direction of the spray gun is parallel to the waterproof plate, with a height difference of 40-50cm, and the spray gun is 100-120cm away from the waterproof plate body. When spraying, the spray gun is required to move at a uniform speed, and the sprinkle point size is basically consistent and evenly distributed on the product surface. In this embodiment, the sprinkle point diameter is controlled at Density is 20-40 pieces / dm 2 .

[0102] Topcoat spraying: 5-10 minutes after the spot paint is sprayed, start spraying the topcoat when the spot paint surface on the waterproof disc body is half dry; filter the topcoat with a 200-300 mesh filter, mix the topcoat, thinner and hardener in a mass ratio of 22:9:1, stir evenly and 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 Φ0.8-1.2mm aperture to evenly spray the mixture of topcoat, thinner and hardener onto the surface of the waterproof disc body, and control the paint film thickness to 30-50μm.

[0103] 4. Baking and curing:

[0104] The sprayed waterproof plate body is sent into the oven, and the temperature is uniformly raised to 140-150℃ within 2 hours, kept at the constant temperature for 20 minutes, and then cooled to room temperature.

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

[0106] Embodiment 5

[0107] Take the unsaturated polyester resin SMC waterproof plate with a thickness of 4mm as the base material and operate according to the following steps:

[0108] 1. Sandblasting treatment of waterproof plate surface:

[0109] Place the inner surface of the waterproof plate body upward at 45 degrees, and perform sandblasting and grinding on the inner surface. During sandblasting, the gun head rotates clockwise at a constant speed and moves from left to right until the inner surface of the waterproof plate body is completely polished and roughened. After polishing, use compressed air to clean the residual sand on the surface to ensure that the surface is oil-free, water-free, dry, and free of stains and other impurities. After the inner surface of the waterproof plate 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, the equipment is a sandblasting machine, and its gun head is vertical and 10-20mm away from the surface of the waterproof plate body.

[0110] 2. Paint preparation:

[0111] A mixing ratio (mass ratio):

[0112] Primer (green): thinner: hardener = 20:8:1, toner is green toner;

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

[0114] Topcoat (transparent varnish): thinner: hardener = 20:8:1, colorless powder;

[0115] The hardener is a methyl silane coupling agent and an ethyl silane coupling agent, and the thinner is an ethylene glycol-ether paint thinner.

[0116] B Spraying order: primer - sprinkle paint - topcoat. Clean the spray gun repeatedly with acetone after each spraying.

[0117] 3. Surface spraying:

[0118] Primer spraying: filter the primer with a 200-300 mesh filter, mix the primer, diluent and hardener in a mass ratio of 20:8:1, stir evenly and 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 Φ0.8-1.2mm aperture to evenly spray the mixture of primer, diluent and hardener onto the surface of the waterproof disk body. The paint film thickness is controlled at 30-50μm, and the final primer layer thickness is 20μm.

[0119] Sprinkle paint spraying: 5-10 minutes after the primer spraying is completed, start spraying the sprinkle paint when the primer surface on the waterproof plate body is half dry; filter the sprinkle paint with a 200-300 mesh filter, mix the sprinkle paint, diluent and hardener in a mass ratio of 20:8:1, stir evenly and pour into the spray gun spray pot, adjust the air pressure of the spray gun to 0.2-0.3Mpa, and use a spray gun with a Φ0.8-1.2mm aperture to evenly spray the mixture of sprinkle paint, diluent and hardener onto the surface of the waterproof plate body covered with primer. When spraying, the spray direction of the spray gun is parallel to the waterproof plate, with a height difference of 40-50cm, and the spray gun is 100-120cm away from the waterproof plate body. When spraying, the spray gun is required to move at a uniform speed, and the sprinkle point size is basically consistent and evenly distributed on the product surface. In this embodiment, the sprinkle point diameter is controlled at Density is 5-10 pieces / dm 2 .

[0120] Topcoat spraying: 5-10 minutes after the spot paint is sprayed, start spraying the topcoat when the spot paint surface on the waterproof disc body is half dry; filter the topcoat with a 200-300 mesh filter, mix the topcoat, thinner and hardener in a mass ratio of 20:8:1, stir evenly and 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 Φ0.8-1.2mm aperture to evenly spray the mixture of topcoat, thinner and hardener onto the surface of the waterproof disc body. The paint film thickness is controlled at 30-50μm, and the final thickness of the topcoat layer is 15μm.

[0121] 4. Baking and curing:

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

[0123] Embodiment 6

[0124] Take the unsaturated polyester resin SMC waterproof plate with a thickness of 4mm as the base material and operate according to the following steps:

[0125] 1. Sandblasting treatment of waterproof plate surface:

[0126] Place the inner surface of the waterproof plate body upward at 45 degrees, and perform sandblasting and grinding on the inner surface. During sandblasting, the gun head rotates clockwise at a constant speed and moves from left to right until the inner surface of the waterproof plate body is completely polished and roughened. After polishing, use compressed air to clean the residual sand on the surface to ensure that the surface is oil-free, water-free, dry, and free of stains and other impurities. After the inner surface of the waterproof plate 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, the equipment is a sandblasting machine, and its gun head is vertical and 10-20mm away from the surface of the waterproof plate body.

[0127] 2. Paint preparation:

[0128] A mixing ratio (mass ratio):

[0129] Primer (green): thinner: hardener = 20:8:1, toner is green toner;

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

[0131] Topcoat (transparent varnish): thinner: hardener = 20:8:1, colorless powder;

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

[0133] B Spraying order: primer - sprinkle paint - topcoat. Clean the spray gun repeatedly with acetone after each spraying.

[0134] 3. Surface spraying:

[0135] Primer spraying: filter the primer with a 200-300 mesh filter, mix the primer, diluent and hardener in a ratio of 20:8:1, stir evenly and 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 Φ0.8-1.2mm aperture to evenly spray the mixture of primer, diluent and hardener onto the surface of the waterproof disk body. The paint film thickness is controlled at 30-50μm.

[0136] Sprinkle paint spraying: 5-10 minutes after the primer spraying is completed, start spraying the sprinkle paint when the primer surface on the waterproof plate body is half dry; filter the sprinkle paint with a 200-300 mesh filter, mix the sprinkle paint, diluent and hardener in a mass ratio of 20:8:1, stir evenly and pour into the spray gun spray pot, adjust the air pressure of the spray gun to 0.2-0.3Mpa, and use a spray gun with a Φ0.8-1.2mm aperture to evenly spray the mixture of sprinkle paint, diluent and hardener onto the surface of the waterproof plate body covered with primer. When spraying, the spray direction of the spray gun is parallel to the waterproof plate, with a height difference of 40-50cm, and the spray gun is 100-120cm away from the waterproof plate body. When spraying, the spray gun is required to move at a uniform speed, and the sprinkle point size is basically consistent and evenly distributed on the product surface. In this embodiment, the sprinkle point diameter is controlled at Density is 5-10 pieces / dm 2 .

[0137] Topcoat spraying: 5-10 minutes after the spot paint is sprayed, start spraying the topcoat when the spot paint surface on the waterproof disc body is half dry; filter the topcoat with a 200-300 mesh filter, mix the topcoat, thinner and hardener in a mass ratio of 20:8:1, stir evenly and 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 Φ0.8-1.2mm aperture to evenly spray the mixture of topcoat, thinner and hardener onto the surface of the waterproof disc body, and control the paint film thickness to 30-50μm.

[0138] 4. Baking and curing:

[0139] The sprayed waterproof plate body is sent into the oven, and the temperature is uniformly raised to 140-150℃ within 2 hours, kept at the constant temperature for 5 minutes, and then cooled to room temperature.

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

[0141] Embodiment 7

[0142] Take the unsaturated polyester resin SMC waterproof plate with a thickness of 4mm as the base material and operate according to the following steps:

[0143] 1. Sandblasting treatment of waterproof plate surface:

[0144] Place the inner surface of the waterproof plate body upward at 45 degrees, and perform sandblasting and grinding on the inner surface. During sandblasting, the gun head rotates clockwise at a constant speed and moves from left to right until the inner surface of the waterproof plate body is completely polished and roughened. After polishing, use compressed air to clean the residual sand on the surface to ensure that the surface is oil-free, water-free, dry, and free of stains and other impurities. After the inner surface of the waterproof plate 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, the equipment is a sandblasting machine, and its gun head is vertical and 10-20mm away from the surface of the waterproof plate body.

[0145] 2. Paint preparation:

[0146] A mixing ratio (mass ratio):

[0147] Primer (green): thinner: hardener = 20:8:1, toner is green toner;

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

[0149] Topcoat (transparent varnish): thinner: hardener = 20:8:1, colorless powder;

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

[0151] B Spraying order: primer - sprinkle paint - topcoat. Clean the spray gun repeatedly with acetone after each spraying.

[0152] 3. Surface spraying:

[0153] Primer spraying: filter the primer with a 200-300 mesh filter, mix the primer, diluent and hardener in a ratio of 20:8:1, stir evenly and 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 Φ0.8-1.2mm aperture to evenly spray the mixture of primer, diluent and hardener onto the surface of the waterproof disk body. The paint film thickness is controlled at 30-50μm.

[0154] Sprinkle paint spraying: 5-10 minutes after the primer spraying is completed, start spraying the sprinkle paint when the primer surface on the waterproof plate body is half dry; filter the sprinkle paint with a 200-300 mesh filter, mix the sprinkle paint, diluent and hardener in a mass ratio of 20:8:1, stir evenly and pour into the spray gun spray pot, adjust the air pressure of the spray gun to 0.2-0.3Mpa, and use a spray gun with a Φ0.8-1.2mm aperture to evenly spray the mixture of sprinkle paint, diluent and hardener onto the surface of the waterproof plate body covered with primer. When spraying, the spray direction of the spray gun is parallel to the waterproof plate, with a height difference of 40-50cm, and the spray gun is 100-120cm away from the waterproof plate body. When spraying, the spray gun is required to move at a uniform speed, and the sprinkle point size is basically consistent and evenly distributed on the product surface. In this embodiment, the sprinkle point diameter is controlled at Density is 5-10 pieces / dm 2 .

[0155] Topcoat spraying: 5-10 minutes after the spot paint is sprayed, start spraying the topcoat when the spot paint surface on the waterproof disc body is half dry; filter the topcoat with a 200-300 mesh filter, mix the topcoat, thinner and hardener in a mass ratio of 20:8:1, stir evenly and 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 Φ0.8-1.2mm aperture to evenly spray the mixture of topcoat, thinner and hardener onto the surface of the waterproof disc body, and control the paint film thickness to 30-50μm.

[0156] 4. Baking and curing:

[0157] The sprayed waterproof plate body is sent into the oven, and the temperature is uniformly raised to 140-150℃ within 2 hours, kept at the constant temperature for 30 minutes, and then cooled to room temperature.

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

[0159] Embodiment 8

[0160] Take the unsaturated polyester resin SMC waterproof plate with a thickness of 4mm as the base material and operate according to the following steps:

[0161] 1. Sandblasting treatment of waterproof plate surface:

[0162] Place the inner surface of the waterproof plate body upward at 45 degrees, and perform sandblasting and grinding on the inner surface. During sandblasting, the gun head rotates clockwise at a constant speed and moves from left to right until the inner surface of the waterproof plate body is completely polished and roughened. After polishing, use compressed air to clean the residual sand on the surface to ensure that the surface is oil-free, water-free, dry, and free of stains and other impurities. After the inner surface of the waterproof plate 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, the equipment is a sandblasting machine, and its gun head is vertical and 10-20mm away from the surface of the waterproof plate body.

[0163] 2. Paint preparation:

[0164] A mixing ratio (mass ratio):

[0165] Primer (green): thinner: hardener = 20:8:1, toner is green toner;

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

[0167] Topcoat (transparent varnish): thinner: hardener = 20:8:1, colorless powder;

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

[0169] B Spraying order: primer - sprinkle paint - topcoat. Clean the spray gun repeatedly with acetone after each spraying.

[0170] 3. Surface spraying:

[0171] Primer spraying: filter the primer with a 200-300 mesh filter, mix the primer, diluent and hardener in a ratio of 20:8:1, stir evenly and 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 Φ0.8-1.2mm aperture to evenly spray the mixture of primer, diluent and hardener onto the surface of the waterproof disk body. The paint film thickness is controlled at 30-50μm.

[0172] Sprinkle paint spraying: 5-10 minutes after the primer spraying is completed, start spraying the sprinkle paint when the primer surface on the waterproof plate body is half dry; filter the sprinkle paint with a 200-300 mesh filter, mix the sprinkle paint, diluent and hardener in a mass ratio of 20:8:1, stir evenly and pour into the spray gun spray pot, adjust the air pressure of the spray gun to 0.2-0.3Mpa, and use a spray gun with a Φ0.8-1.2mm aperture to evenly spray the mixture of sprinkle paint, diluent and hardener onto the surface of the waterproof plate body covered with primer. When spraying, the spray direction of the spray gun is parallel to the waterproof plate, with a height difference of 40-50cm, and the spray gun is 100-120cm away from the waterproof plate body. When spraying, the spray gun is required to move at a uniform speed, and the sprinkle point size is basically consistent and evenly distributed on the product surface. In this embodiment, the sprinkle point diameter is controlled at Density is 5-10 pieces / dm 2 .

[0173] Topcoat spraying: 5-10 minutes after the spot paint is sprayed, start spraying the topcoat when the spot paint surface on the waterproof disc body is half dry; filter the topcoat with a 200-300 mesh filter, mix the topcoat, thinner and hardener in a mass ratio of 20:8:1, stir evenly and 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 Φ0.8-1.2mm aperture to evenly spray the mixture of topcoat, thinner and hardener onto the surface of the waterproof disc body, and control the paint film thickness to 30-50μm.

[0174] 4. Baking and curing:

[0175] The sprayed waterproof plate body is sent into the oven, and the temperature is uniformly raised to 110-120℃ within 2 hours, kept at the constant temperature for 20 minutes, and then cooled to room temperature.

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

[0177] Embodiment 9

[0178] Take the unsaturated polyester resin SMC waterproof plate with a thickness of 4mm as the base material and operate according to the following steps:

[0179] 1. Sandblasting treatment of waterproof plate surface:

[0180] Place the inner surface of the waterproof plate body upward at 45 degrees, and perform sandblasting and grinding on the inner surface. During sandblasting, the gun head rotates clockwise at a constant speed and moves from left to right until the inner surface of the waterproof plate body is completely polished and roughened. After polishing, use compressed air to clean the residual sand on the surface to ensure that the surface is oil-free, water-free, dry, and free of stains and other impurities. After the inner surface of the waterproof plate 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, the equipment is a sandblasting machine, and its gun head is vertical and 10-20mm away from the surface of the waterproof plate body.

[0181] 2. Paint preparation:

[0182] A mixing ratio (mass ratio):

[0183] Primer (green): thinner: hardener = 20:8:1, toner is green toner;

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

[0185] Topcoat (transparent varnish): thinner: hardener = 20:8:1, colorless powder;

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

[0187] B Spraying order: primer - sprinkle paint - topcoat. Clean the spray gun repeatedly with acetone after each spraying.

[0188] 3. Surface spraying:

[0189] Primer spraying: filter the primer with a 200-300 mesh filter, mix the primer, diluent and hardener in a ratio of 20:8:1, stir evenly and 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 Φ0.8-1.2mm aperture to evenly spray the mixture of primer, diluent and hardener onto the surface of the waterproof disk body. The paint film thickness is controlled at 30-50μm.

[0190] Sprinkle paint spraying: 5-10 minutes after the primer spraying is completed, start spraying the sprinkle paint when the primer surface on the waterproof plate body is half dry; filter the sprinkle paint with a 200-300 mesh filter, mix the sprinkle paint, diluent and hardener in a mass ratio of 20:8:1, stir evenly and pour into the spray gun spray pot, adjust the air pressure of the spray gun to 0.2-0.3Mpa, and use a spray gun with a Φ0.8-1.2mm aperture to evenly spray the mixture of sprinkle paint, diluent and hardener onto the surface of the waterproof plate body covered with primer. When spraying, the spray direction of the spray gun is parallel to the waterproof plate, with a height difference of 40-50cm, and the spray gun is 100-120cm away from the waterproof plate body. When spraying, the spray gun is required to move at a uniform speed, and the sprinkle point size is basically consistent and evenly distributed on the product surface. In this embodiment, the sprinkle point diameter is controlled at Density is 5-10 pieces / dm 2 .

[0191] Topcoat spraying: 5-10 minutes after the spot paint is sprayed, start spraying the topcoat when the spot paint surface on the waterproof disc body is half dry; filter the topcoat with a 200-300 mesh filter, mix the topcoat, thinner and hardener in a mass ratio of 20:8:1, stir evenly and 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 Φ0.8-1.2mm aperture to evenly spray the mixture of topcoat, thinner and hardener onto the surface of the waterproof disc body, and control the paint film thickness to 30-50μm.

[0192] 4. Baking and curing:

[0193] The sprayed waterproof plate body is sent into the oven, and the temperature is uniformly raised to 120-130°C within 2 hours, kept at the constant temperature for 20 minutes, and then cooled to room temperature.

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

[0195] Embodiment 10

[0196] Take the unsaturated polyester resin SMC waterproof plate with a thickness of 4mm as the base material and operate according to the following steps:

[0197] 1. Sandblasting treatment of waterproof plate surface:

[0198] Place the inner surface of the waterproof plate body upward at 45 degrees, and perform sandblasting and grinding on the inner surface. During sandblasting, the gun head rotates clockwise at a constant speed and moves from left to right until the inner surface of the waterproof plate body is completely polished and roughened. After polishing, use compressed air to clean the residual sand on the surface to ensure that the surface is oil-free, water-free, dry, and free of stains and other impurities. After the inner surface of the waterproof plate 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, the equipment is a sandblasting machine, and its gun head is vertical and 10-20mm away from the surface of the waterproof plate body.

[0199] 2. Paint preparation:

[0200] A mixing ratio (mass ratio):

[0201] Primer (green): thinner: hardener = 20:8:1, toner is green toner;

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

[0203] Topcoat (transparent varnish): thinner: hardener = 20:8:1, colorless powder;

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

[0205] B Spraying order: primer - sprinkle paint - topcoat. Clean the spray gun repeatedly with acetone after each spraying.

[0206] 3. Surface spraying:

[0207] Primer spraying: filter the primer with a 200-300 mesh filter, mix the primer, diluent and hardener in a ratio of 20:8:1, stir evenly and 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 Φ0.8-1.2mm aperture to evenly spray the mixture of primer, diluent and hardener onto the surface of the waterproof disk body. The paint film thickness is controlled at 30-50μm.

[0208] Sprinkle paint spraying: 5-10 minutes after the primer spraying is completed, start spraying the sprinkle paint when the primer surface on the waterproof plate body is half dry; filter the sprinkle paint with a 200-300 mesh filter, mix the sprinkle paint, diluent and hardener in a mass ratio of 20:8:1, stir evenly and pour into the spray gun spray pot, adjust the air pressure of the spray gun to 0.2-0.3Mpa, and use a spray gun with a Φ0.8-1.2mm aperture to evenly spray the mixture of sprinkle paint, diluent and hardener onto the surface of the waterproof plate body covered with primer. When spraying, the spray direction of the spray gun is parallel to the waterproof plate, with a height difference of 40-50cm, and the spray gun is 100-120cm away from the waterproof plate body. When spraying, the spray gun is required to move at a uniform speed, and the sprinkle point size is basically consistent and evenly distributed on the product surface. In this embodiment, the sprinkle point diameter is controlled at Density is 5-10 pieces / dm 2 .

[0209] Topcoat spraying: 5-10 minutes after the spot paint is sprayed, start spraying the topcoat when the spot paint surface on the waterproof disc body is half dry; filter the topcoat with a 200-300 mesh filter, mix the topcoat, thinner and hardener in a mass ratio of 20:8:1, stir evenly and 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 Φ0.8-1.2mm aperture to evenly spray the mixture of topcoat, thinner and hardener onto the surface of the waterproof disc body, and control the paint film thickness to 30-50μm.

[0210] 4. Baking and curing:

[0211] The sprayed waterproof plate body is sent into the oven, and the temperature is uniformly raised to 130-140℃ within 2 hours, kept at the constant temperature for 20 minutes, and then cooled to room temperature.

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

[0213] Example 11 Test and discussion

[0214] 1) The waterproof discs prepared by different preparation methods of Examples 2 to 10 were tested, wherein the Barcol hardness, acid resistance test, alkali resistance test, abrasion resistance test, heat resistance test A, and heat resistance test B were tested according to GB / T 13095-2008, the cross-cut test was tested according to GB / T9286-1998, the high and low temperature test was tested according to GB / T 2423.2-2008, and the anti-slip test was tested according to DIN 51130. The specific test results are shown in the following table:

[0215] Table 1 Comparison of test results of spraying examples

[0216]

[0217] Table 1 shows that the bonding strength of the waterproof disk with the coating after surface sandblasting is significantly better than that of the untreated waterproof disk. The curing effect is best when the mixing ratio (mass ratio) is primer / sprinkling paint / topcoat: diluent: hardener = 20:8:1, and the curing effect is significantly better than the curing effect at 110-120°C or the baking time is less than 20 minutes during baking curing. Comprehensively considering various test indicators, especially hardness, acid and alkali corrosion resistance and wear resistance, the waterproof disk prepared in Example 5 has the best effect.

[0218] 2) The waterproof disk with nanocomposite ceramic coating prepared in Example 5 and the ordinary waterproof disk without coating were tested, and the test data are as follows:

[0219] Table 2 Coating performance comparison test table

[0220]

[0221] Table 2 shows that the indicators of the waterproof disk with nano-composite ceramic coating on the surface are better than those of the ordinary waterproof disk without coating on the surface, especially in terms of hardness, acid and alkali corrosion resistance, wear resistance, etc.

[0222] The surface of the waterproof disk of the present invention is covered with a nano-composite ceramic coating, which is formed by a nano-composite ceramic coating. The nano-composite ceramic coating takes into account the flexibility of organic resins and the high hardness characteristics of inorganic resins, comparable to the construction convenience of traditional coatings, and gives the coating film high hardness and weather resistance. Because the inorganic resin of nano-sol is added to the nano-composite ceramic coating, the product surface obtains a higher coating hardness, better weather resistance, and excellent chemical corrosion resistance. The surface of the coating after curing is similar to the surface effect of a lotus leaf, with good anti-slip and hydrophobic properties, easy to clean stains, etc., and is convenient to construct and save materials, environmentally friendly and non-toxic, and can significantly improve the various comprehensive properties of the waterproof disk, such as wear resistance, hardness, weather resistance, anti-slip, quick drying, chemical corrosion resistance, and easy cleaning, and the color of the nano-composite ceramic coating can be changed by adding pigments and fillers, making the waterproof disk more beautiful.

[0223] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the contents of the present invention and implement them accordingly. They cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A waterproof tray, characterized in that: The waterproof disc comprises a waterproof disc body and a nano-composite ceramic coating covering the inner surface of the waterproof disc body, wherein the nano-composite ceramic coating comprises a primer layer, a sprinkle paint layer and a topcoat layer in order from bottom to top, wherein the primer layer, the sprinkle paint layer and the topcoat layer are formed by spraying a primer, a sprinkle paint and a topcoat respectively; and the primer, the sprinkle paint and the topcoat all comprise nano-ceramic composite coatings; The waterproof disk is prepared by the following method: Step 1) Surface sandblasting and polishing: The inner surface of the waterproof plate body is placed tilted upward, the waterproof plate body is at an angle of 30-60° with the horizontal plane, and the inner surface of the waterproof plate body is sandblasted and polished. The sandblasting gun head rotates clockwise at a constant speed and moves from left to right until the inner surface of the waterproof plate body is completely polished and roughened. After polishing, the residual sand on the inner surface of the waterproof plate body is cleaned with compressed air to ensure that the inner surface of the waterproof plate body is free of oil, water and impurities. After the inner surface of the waterproof plate body is treated, it is placed horizontally for spraying; Step 2) Primer spraying: Filter the primer with a 200-300 mesh filter, mix the primer, diluent and hardener in a mass ratio of 18-22:7-9:1, stir evenly and 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 pore size of Φ0.8-1.2mm to evenly spray the mixture of the primer, diluent and hardener onto the surface of the waterproof plate body; Step 3) Spraying of scattering paint: 5-10 minutes after the primer is sprayed, start spraying the scattering paint when the primer surface on the waterproof disc body is half dry; filter the scattering paint with a 200-300 mesh filter, mix the scattering paint, diluent and hardener in a mass ratio of 18-22:7-9:1, stir evenly and pour into the spray pot of the spray gun, adjust the air pressure of the spray gun to 0.2-0.3Mpa, and use a spray gun with a pore size of Φ0.8-1.2mm to evenly spray the mixture of scattering paint, diluent and hardener onto the surface of the waterproof disc body covered with primer. During spraying, the spray direction of the spray gun is parallel to the waterproof disc, the height difference is 40-50cm, the spray gun is 100-120cm away from the waterproof disc body, and the spray gun is required to be moved at a uniform speed during spraying; after spraying the primer, it is necessary to wait until the surface is half dry before spraying the scattering paint; Step 4) Spraying of topcoat: 5-10 minutes after the spraying of the sprinkle paint is completed, start spraying the topcoat when the sprinkle paint surface on the waterproof disk body is half dry; filter the topcoat with a 200-300 mesh filter, mix the topcoat, diluent and hardener in a mass ratio of 18-22:7-9:1, stir evenly and 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 pore size of Φ0.8-1.2mm to evenly spray the mixture of topcoat, diluent and hardener onto the surface of the waterproof disk body. After spraying the sprinkle paint, wait until the surface is half dry before spraying the topcoat; Step 5) baking and curing: the waterproof plate body, whose surface is sequentially covered with topcoat, sprinkle paint and primer from top to bottom, is placed in an oven for baking and curing, the oven is heated to 140-150° C. at a uniform speed within 2 hours, and the baking is continued at a constant temperature for 20 minutes, and then cooled to room temperature, the topcoat is cured into a topcoat layer, the sprinkle paint is cured into a sprinkle 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 a waterproof plate is obtained; The hardener is one or more of methyl silane coupling agent, ethyl silane coupling agent or phenyl silane coupling agent; The nano ceramic composite coating comprises the following components in parts by weight: 5-15 parts of deionized water, 70-80 parts of inorganic resin, 25-70 parts of pigments and fillers, 1-3 parts of wetting agents, 2-4 parts of dispersants, 0.5-1.5 parts of defoamers, 0.5-1.5 parts of film-forming aids, 1-3 parts of leveling agents, 2-4 parts of thickeners, and 1-3 parts of curing agents; the film-forming aid is a silane coupling agent; the inorganic resin comprises one or more of silicon dioxide nanosol, titanium dioxide sol or aluminum oxide sol; the pigments and fillers comprise toner and fillers, and the mass ratio of the toner to the filler is 1:2-4; the wetting agent is polyoxyethylene alkylated ether, the dispersant is an acrylic polymer, the defoamer is an ethylene oxide substance, the leveling agent is polydimethylsiloxane, and the thickener is a silicate substance; The preparation method of the nano ceramic composite coating comprises the following steps: 1) Dissolve the dispersant and wetting agent in water, stir and mix evenly; 2) Adding pigments and fillers to the mixed solution prepared in step 1) and stirring to mix the components evenly to obtain slurry A; 3) Mixing the inorganic resin, the curing agent and the film-forming aid, stirring, and obtaining slurry B; 4) mixing the slurry A in step 2) and the slurry B in step 3), stirring them evenly and then grinding them; 5) Add additives during the stirring process to adjust the mixture and obtain a nano-ceramic composite coating.

2. The waterproof tray according to claim 1, characterized in that: The filler comprises talc, calcium carbonate and kaolin, and the mass ratio of the talc, calcium carbonate and kaolin is 1-3:4-6:

1.

3. The waterproof tray according to claim 1, characterized in that: The thickness of the nano-composite ceramic coating is 30-50 μm.

4. The waterproof tray according to claim 1, characterized in that: The thickness of the primer layer and the topcoat layer are both 10-25 μm.

5. The waterproof tray according to claim 1, characterized in that: The thickness of the primer layer is greater than that of the topcoat layer.

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