Preparation method of metal product with screen decoration texture on surface

Abstract

The invention discloses a preparation method of a metal product with a screen decoration texture on the surface, which is characterized in that a texture pattern is prepared by adopting a freely flowing coating, a screen decoration texture forming agent and water, and the screen decoration texture forming agent and a protective coating on the water surface can interact to form a spider web type screen decoration pattern. According to the method, complex machining is not needed, operation is easy, batch repeated production can be achieved, meanwhile, the method is suitable for surface machining of base materials with complex appearances, and the concave-convex textures of the net ornaments are smooth and natural in line, graceful in curve, high in texture layering sense, natural in texture and high in texture.

Description

Technical Field

[0001] The invention relates to the technical field of metal product processing, and in particular to a method for preparing a metal product with a mesh decorative texture on the surface. Background Art

[0002] With the increasing demand for arts and crafts and personalized products, the market has put forward higher aesthetic, artistic and practical requirements for the surface texture treatment of metal products. Traditional metal surface texture processing technologies, including manual chiseling, mechanical engraving and laser engraving, often use pre-set or designed patterns to achieve metal surface textures. They have good pattern reproducibility and can be mass-produced, but they also have disadvantages such as time-consuming, high operating technology requirements, and pattern programming. In addition, traditional chemical etching technology usually uses self-adhesive stickers, pattern printing and other methods as metal surface pattern masking protection to form texture patterns, and then chemical acid-base etching or corrosive corrosion treatment is performed. Although this method can produce precise patterns, the patterns are too standardized and lack natural beauty, and cannot meet consumers' demand for natural textures and irregular patterns. At the same time, since this treatment method is limited by the protective layer material and technology, it is difficult to achieve texture pattern etching of complex shapes or irregular objects. Summary of the invention

[0003] The purpose of the present invention is to provide a method for preparing a metal product with a mesh texture on the surface. The method does not require complicated mechanical processing, is simple to operate, and can be produced repeatedly in batches. At the same time, the method is suitable for surface processing of substrates with complex shapes. The mesh texture has smooth and natural concave and convex texture lines, beautiful curves, strong texture layering, natural texture, and strong texture.

[0004] The technical solution adopted by the present invention to solve its technical problem is: A method for preparing a metal product having a mesh texture on the surface comprises the following steps: (1) Preparation of net-grained decorative texture forming agent: Prepare the agent in a volume ratio of silicone oil to liquid paraffin = 5:1-1.5, add or not add a viscosity regulator, and stir evenly to form a net-grained decorative texture forming agent with a viscosity of 150-300 centipoise; (2) Preparation of metal surface protective coating materials and etching agents; (3) Cleaning the surface of the metal substrate: remove the oxide layer and oil stains on the surface of the substrate by pickling, grinding or polishing, then rinse with clean water and blow dry for later use; (4) Making of web-like decorative texture: Pour clean water into a water tank, and at room temperature and keep the water surface calm, spray the metal surface protective coating material evenly on the water surface to form a protective coating; then spray the web-like decorative texture forming agent evenly on the protective coating, and the two interact and react for 30-120 seconds to form a spider web-like web-like decorative pattern; (5) Transfer: Slowly immerse the metal substrate in the water surface covered with mesh patterns, slowly take it out after the mesh patterns are transferred to the surface of the metal substrate, dry it to make the mesh texture coating dry and solidify, take it out to check the formation of the mesh texture coating, and perform trimming; (6) Protect the area not covered with the mesh texture, then place the metal substrate in an etching agent for etching to form a mesh texture on the surface of the metal substrate. After the etching depth reaches 200-450 μm, take it out and wash it with clean water. Then remove the protective layer on the surface of the metal substrate and wash it. Finally, after post-processing, a metal product with a mesh texture on the surface is obtained.

[0005] The invention uses free-flowing paint, a web-decoration texture forming agent and water to produce a texture pattern. The core of the invention is that a specific web-decoration texture forming agent and a specific protective coating on the water surface can interact to form a special spider web-like web-decoration pattern.

[0006] In step (1), the viscosity modifier is selected from at least one of cyclohexane, xylene and dimethyl ether.

[0007] In step (1), the silicone oil is selected from at least one of dimethyl silicone oil and vinyl silicone oil, and the viscosity of the silicone oil is in the range of 100-800 centipoise.

[0008] In step (2), the metal surface protective coating material is composed of 55-60 parts by weight of liquid acrylic resin (solid content 60%), 12-15 parts of methyl etherified amino resin, 20-30 parts of solvent, 0.3-0.5 parts of defoamer (EFKA-2526), ​​0.5-0.8 parts of leveling agent (EFKA3777 or TEGO Glide450), and 0.2-0.5 parts of oily color paste. The solvent is a composite solvent of xylene, ethyl acetate, and isopropanol in a ratio of 2:1:1.

[0009] The methyl etherified amino resin in the protective coating material formula is a baking-type curing agent. The purpose of using a baking-type curing agent is to prevent unexpected curing of the coating during the formation of the mesh pattern texture. In addition, no inorganic pigments with a large specific gravity are added to the formula. The amount of color paste added is sufficient to distinguish the colors on the water surface and is controlled to a minimum as much as possible, with blue, red and green being preferred. The amount of leveling agent added is also more than that in the usual coating formula to facilitate the formation of a coating protective film layer on the water surface.

[0010] The material of the metal substrate is copper, and the components of the etching agent are as follows according to mass percentage: 5% copper chloride, 10% concentrated hydrochloric acid (mass concentration 36%), 25% hydrogen peroxide (mass concentration 30%), and 60% water.

[0011] The material of the metal substrate is stainless steel, and the components of the etching agent are composed of 10% concentrated sulfuric acid (mass concentration 98%), 15% concentrated nitric acid (mass concentration 68%), 10% concentrated phosphoric acid (mass concentration 70%), and 65% water in volume ratio.

[0012] In step (4), the metal surface protective coating material is sprayed using a straight nozzle, the nozzle is 10-20 cm away from the water surface, the spraying pressure is controlled at 0.1-0.2 MPa, and the thickness of the protective coating formed is 30-60 microns.

[0013] The protective coating uses a straight-line rather than a circular nozzle and a much lower spray pressure than conventional paint (0.3-0.7MPa) in order to better form a uniform paint film on the water surface.

[0014] After the protective coating forms a film on the water surface, the next step must be carried out within 10 minutes to avoid excessive evaporation of the diluent and wrinkling of the paint film.

[0015] In step (4), the net pattern decorative texture forming agent is sprayed by a circular nozzle, the spraying pressure is controlled at 0.2-0.3MPa, the nozzle is 10-20cm away from the protective coating, the net pattern decorative texture forming agent is sprayed 1 to 2 times, and the amount of net pattern decorative texture forming agent per square meter is 10-30g.

[0016] In step (5), the metal substrate is slowly immersed in the water surface covered with the mesh pattern at an angle of 30-60 degrees to the water surface.

[0017] In step (6), the etching temperature is controlled at 40-50°C.

[0018] All viscosity values ​​of the present invention are measured using a Tu-4 cup at 25°C.

[0019] The beneficial effects of the present invention are: design controllability: the net pattern is designable and adjustable within a certain range to meet different needs. Since the net pattern is formed on the water surface, the net pattern has a natural texture and a strong texture. Since the surface texture is formed in water, it can be applied to metal substrates of various shapes and is basically not affected by the appearance of the substrate. The process operation is simple and easy, the technical requirements for the operator are relatively low, and the application prospects are relatively broad. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a spider web-like net decorative pattern formed in the present invention; Figure 2 It is another method of forming a spider web-like web pattern of the present invention; Figure 3 It is the pattern formed in comparative example 1; Figure 4 This is the spider web texture formed on the copper test piece by the present invention; Figure 5 The invention discloses a copper teapot with spider web pattern texture. DETAILED DESCRIPTION

[0021] The technical solution of the present invention is further described in detail below through specific embodiments.

[0022] In the present invention, unless otherwise specified, the raw materials and equipment used can be purchased from the market or are commonly used in the art. The methods in the following embodiments, unless otherwise specified, are all conventional methods in the art.

[0023] Embodiment 1: A method for preparing a metal product having a mesh texture on the surface comprises the following steps: (1) Preparation of net-patterned texture forming agent: Prepare silicone oil (dimethyl silicone oil, viscosity of about 150 centipoise): liquid paraffin (viscosity of about 150 centipoise) in a volume ratio of 5:1 and stir evenly to form a net-patterned texture forming agent with a viscosity of about 150 centipoise.

[0024] (2) Preparation of metal surface protective coating materials and etching agents; The metal surface protective coating material is composed of 55 parts by weight of liquid acrylic resin (solid content 60%, Sanmu), 12 parts of methyl etherified amino resin, 20 parts of solvent, 0.3 parts of defoaming agent (EFKA-2526), ​​0.5 parts of leveling agent (EFKA-3777), and 0.2 parts of oily color paste (blue); the solvent is prepared by compounding xylene, ethyl acetate, and isopropanol in a volume ratio of 2:1:1.

[0025] The components of the etching agent are as follows by mass percentage: 5% copper chloride, 10% concentrated hydrochloric acid (concentration 36%), 25% hydrogen peroxide (concentration 30%), and 60% water.

[0026] (3) Surface cleaning of metal substrate: Remove the oxide layer and oil stains on the surface of the copper specimen (size 200*300mm) by polishing, then rinse with clean water and blow dry for later use.

[0027] (4) Net pattern texture production: Pour about 75% of clean water into a water tank with a length, width and height of 800*800*600mm. Keep the water surface calm and at room temperature. Use a straight nozzle to spray the metal surface protective coating material. The nozzle is 10cm away from the water surface. The spraying pressure is controlled at 0.1MPa. The metal surface protective coating material is evenly sprayed on the water surface to form a protective coating with a thickness of 30 microns. After 1 minute, the net pattern texture forming agent is evenly sprayed on the protective coating. The net pattern texture forming agent is sprayed with a circular nozzle. The spraying pressure is controlled at 0.2MPa. The nozzle is 10cm away from the protective coating. The net pattern texture forming agent is sprayed once. The amount of net pattern texture forming agent per square meter is 10 grams. After the two interact and react for 30 seconds, a spider web-like net pattern is formed (such as Figure 2 as shown).

[0028] (5) Transfer: Slowly immerse the copper test piece into the water surface covered with mesh patterns at an angle of 30°. After the mesh patterns are transferred to the surface of the copper test piece, slowly take it out and bake it in an oven at 90±2℃ for 30 minutes to dry and solidify the mesh texture coating. Take it out and check the formation of the mesh texture coating. Make appropriate adjustments to any unsatisfactory areas.

[0029] (6) The area not covered with the web-like decorative texture is protected with a self-adhesive tape, and then the copper test piece is placed in an etching agent for etching to form a web-like decorative texture on the surface of the copper test piece. The etching temperature is controlled at 40±2°C. After the etching depth reaches 200 μm, the copper test piece is taken out and cleaned with clean water. Then, a commercially available paint stripper is used to remove the texture pattern coating on the surface of the copper test piece and the self-adhesive tape and clean it. Finally, the copper test piece is subjected to conventional black coloring, and the color layer on the convex surface of the test piece is polished off. After the surface is blown dry, the surface is protected with a transparent varnish to obtain a copper test piece with a spider web-like pattern texture on the surface.

[0030] Embodiment 2: A method for preparing a metal product having a mesh texture on the surface comprises the following steps: (1) Preparation of net-textured decorative texture forming agent: Prepare the agent in a volume ratio of silicone oil (vinyl silicone oil, viscosity 300 centipoise): liquid paraffin (viscosity about 250 centipoise) = 5: 1.5, add viscosity regulator (xylene) and stir evenly to form a net-textured decorative texture forming agent with a viscosity of about 200 centipoise.

[0031] (2) Preparation of metal surface protective coating materials and etching agents; The metal surface protective coating material is composed of 58 parts by weight of liquid acrylic resin (solid content 60%), 14 parts of methyl etherified amino resin, 25 parts of solvent, 0.4 parts of defoaming agent (EFKA-2526), ​​0.6 parts of leveling agent (TEGO Glide450), and 0.3 parts of oily color paste (red); the solvent is prepared by compounding xylene, ethyl acetate, and isopropanol in a volume ratio of 2:1:1.

[0032] The components of the etching agent are as follows by mass percentage: 5% copper chloride, 10% concentrated hydrochloric acid (concentration 36%), 25% hydrogen peroxide (concentration 30%), and 60% water.

[0033] (3) Cleaning of metal substrate surface: Remove the oxide layer and oil stains on the surface of the copper specimen (size 200*300mm) by grinding, then rinse with clean water and blow dry for later use.

[0034] (4) Production of mesh texture: Pour about 80% of clean water into a water tank with a length, width and height of 800*800*600mm. While maintaining a calm water surface and room temperature, use a straight-line nozzle to spray the metal surface protective coating material. The nozzle is 15cm away from the water surface and the spraying pressure is controlled at 0.15MPa. The metal surface protective coating material is evenly sprayed on the water surface to form a protective coating with a thickness of 40 microns; then, the mesh texture forming agent is evenly sprayed on the protective coating. The mesh texture forming agent is sprayed with a circular nozzle. The spraying pressure is controlled at 0.25MPa. The nozzle is 15cm away from the protective coating. The mesh texture forming agent is sprayed twice. The amount of mesh texture forming agent per square meter is 20 grams. After the two interact with each other for 60 seconds, a spider web-like mesh pattern is formed.

[0035] (5) Transfer: Slowly immerse the copper test piece into the water surface covered with mesh patterns at an angle of 45°. After the mesh patterns are transferred to the surface of the copper test piece, slowly take it out and bake it in an oven at 90±2℃ for 30 minutes to dry and solidify the mesh texture coating. Take it out and check the formation of the mesh texture coating, and trim any unsatisfactory areas.

[0036] (6) The area not covered with the web-like texture is protected with a self-adhesive tape, and then the copper test piece is placed in an etching agent for etching to form a web-like texture on the surface of the copper test piece. The etching temperature is controlled at 45±2°C. After the etching depth reaches 350 μm, the copper test piece is taken out and cleaned with clean water. Then, a commercially available paint stripper is used to remove the texture pattern coating on the surface of the copper test piece and the self-adhesive tape and clean it. Finally, the copper test piece is subjected to conventional black coloring, and the color layer on the convex surface of the test piece is polished off. After the surface is dried, the surface is protected with a transparent varnish to obtain a copper test piece with a spider web-like texture on the surface (such as Figure 4The copper test piece with spider web pattern texture of this embodiment is processed into a copper teapot as shown in FIG. Figure 5 shown.

[0037] Embodiment 3: A method for preparing a metal product having a mesh texture on the surface comprises the following steps: (1) Preparation of net-textured decorative texture forming agent: Prepare a volume ratio of silicone oil (dimethyl silicone oil, viscosity 800 centipoise): liquid paraffin (viscosity about 300 centipoise) = 5: 1.5, add a viscosity regulator (a mixture of cyclohexane and dimethyl ether in a volume ratio of 1:1) and stir evenly to form a net-textured decorative texture forming agent with a viscosity of about 300 centipoise.

[0038] (2) Preparation of metal surface protective coating materials and etching agents; The metal surface protective coating material is composed of 60 parts by weight of liquid acrylic resin (solid content 60%, Sanmu), 15 parts of methyl etherified amino resin, 30 parts of solvent, 0.5 parts of defoaming agent (EFKA-2526), ​​0.8 parts of leveling agent (EFKA-3777), and 0.5 parts of oily color paste (green); the solvent is prepared by compounding xylene, ethyl acetate, and isopropanol in a volume ratio of 2:1:1.

[0039] The material of the metal substrate is 304 stainless steel, and the components of the etching agent are composed of 10% concentrated sulfuric acid (mass concentration 98%), 15% concentrated nitric acid (mass concentration 68%), 10% concentrated phosphoric acid (mass concentration 70%), and 65% water in volume ratio.

[0040] (3) Cleaning of metal substrate surface: Remove the oxide layer and oil stains on the surface of the stainless steel specimen (size 200*300mm) by pickling, then rinse with clean water and blow dry for later use.

[0041] (4) Production of net-patterned texture: Pour about 75% of clean water into a water tank with a length, width and height of 800*800*600mm. Keep the water surface calm and at room temperature. Use a straight-line nozzle to spray the metal surface protective coating material. The nozzle is 20cm away from the water surface. The spraying pressure is controlled at 0.2MPa. The metal surface protective coating material is evenly sprayed on the water surface to form a protective coating with a thickness of 60 microns. Then, the net-patterned texture forming agent is evenly sprayed on the protective coating. The net-patterned texture forming agent is sprayed with a circular nozzle. The spraying pressure is controlled at 0.3MPa. The nozzle is 20cm away from the protective coating. The net-patterned texture forming agent is sprayed twice. The amount of net-patterned texture forming agent per square meter is 30 grams. After the two interact and react for 120 seconds, a spider web-like net-patterned pattern (such as Figure 1 as shown).

[0042] (5) Transfer: Slowly immerse the stainless steel test piece into the water surface covered with mesh patterns at an angle of 60°. After the mesh patterns are transferred to the surface of the stainless steel test piece, slowly take it out and bake it in an oven at 90±2℃ for 30 minutes to dry and solidify the mesh texture coating. Take it out and check the formation of the mesh texture coating. Make adjustments to any unsatisfactory areas.

[0043] (6) The area not covered with the web-like texture is protected with a self-adhesive tape, and then the stainless steel test piece is placed in an etching agent for etching to form a web-like texture on the surface of the stainless steel test piece. The etching temperature is controlled at 40°C. After the etching depth reaches 450 μm, the test piece is taken out and cleaned with clean water. Then, a commercially available paint stripper is used to remove the texture pattern coating on the surface of the stainless steel test piece and the self-adhesive tape and clean it. Finally, the stainless steel test piece is blackened with a conventional stainless steel blackening agent, and the color layer on the convex surface of the test piece is polished off. After the surface is dried, the surface is protected with a transparent varnish to obtain a stainless steel test piece with a spider web-like texture on the surface.

[0044] Comparative Example 1 The difference between this example and Example 2 is that the net-texture forming agent uses an oily asphalt waterproof coating, and xylene is used to adjust the viscosity to about 200 centipoise. The net-texture pattern formed is as follows Figure 3 As shown, a spider web-like mesh pattern cannot be formed, there are large patches of adhesion in the pattern, and the mesh pattern forming effect is poor.

[0045] The above-described embodiment is only a preferred solution of the present invention and does not limit the present invention in any form. There are other variations and modifications without exceeding the technical solution described in the claims.

Claims

1. A method for preparing a metal product having a mesh texture on the surface, It is characterized in that The steps include: (1) Preparation of net-grained decorative texture forming agent: Prepare the agent in a volume ratio of silicone oil to liquid paraffin = 5:1-1.5, add or not add a viscosity regulator, and stir evenly to form a net-grained decorative texture forming agent with a viscosity of 150-300 centipoise; (2) Preparation of metal surface protective coating materials and etching agents; (3) Cleaning the surface of the metal substrate: remove the oxide layer and oil stains on the surface of the substrate by pickling, grinding or polishing, then rinse with clean water and blow dry for later use; (4) Making of web-like decorative texture: Pour clean water into a water tank, and at room temperature and keep the water surface calm, spray the metal surface protective coating material evenly on the water surface to form a protective coating; then spray the web-like decorative texture forming agent evenly on the protective coating, and the two interact and react for 30-120 seconds to form a spider web-like web-like decorative pattern; (5) Transfer: Slowly immerse the metal substrate in the water surface covered with mesh patterns, slowly take it out after the mesh patterns are transferred to the surface of the metal substrate, dry it to make the mesh texture coating dry and solidify, take it out to check the formation of the mesh texture coating, and perform trimming; (6) Protect the area not covered with the mesh texture, then place the metal substrate in an etching agent for etching to form a mesh texture on the surface of the metal substrate. After the etching depth reaches 200-450 μm, take it out and wash it with clean water. Then remove the protective layer on the surface of the metal substrate and wash it. Finally, after post-processing, a metal product with a mesh texture on the surface is obtained.

2. The preparation method according to claim 1, It is characterized in that In step (1), the viscosity modifier is selected from at least one of cyclohexane, xylene and dimethyl ether.

3. The preparation method according to claim 1, It is characterized in that In step (1), the silicone oil is selected from at least one of dimethyl silicone oil and vinyl silicone oil, and the viscosity of the silicone oil is in the range of 100-800 centipoise.

4. The preparation method according to claim 1, It is characterized in that In step (2), the metal surface protective coating material is composed of 55-60 parts by weight of liquid acrylic resin, 12-15 parts of methyl etherified amino resin, 20-30 parts of solvent, 0.3-0.5 parts of defoaming agent, 0.5-0.8 parts of leveling agent, and 0.2-0.5 parts of oily color paste.

5. The preparation method according to claim 1, It is characterized in that The material of the metal substrate is copper, and the components of the etching agent are as follows in terms of mass percentage: 5% copper chloride, 10% concentrated hydrochloric acid, 25% hydrogen peroxide, and 60% water.

6. The preparation method according to claim 1, It is characterized in that The material of the metal substrate is stainless steel, and the components of the etching agent are composed of 10% concentrated sulfuric acid, 15% concentrated nitric acid, 10% concentrated phosphoric acid, and 65% water in volume ratio.

7. The preparation method according to claim 1, It is characterized in that In step (4), the metal surface protective coating material is sprayed using a straight nozzle, the nozzle is 10-20 cm away from the water surface, the spraying pressure is controlled at 0.1-0.2 MPa, and the thickness of the protective coating formed is 30-60 microns.

8. The preparation method according to claim 1, It is characterized in that In step (4), the net pattern decorative texture forming agent is sprayed by a circular nozzle, the spraying pressure is controlled at 0.2-0.3MPa, the nozzle is 10-20cm away from the protective coating, the net pattern decorative texture forming agent is sprayed 1 to 2 times, and the amount of net pattern decorative texture forming agent per square meter is 10-30g.

9. The preparation method according to claim 1, It is characterized in that In step (5), the metal substrate is slowly immersed in the water surface covered with the mesh pattern at an angle of 30-60 degrees to the water surface.

10. The preparation method according to claim 1, It is characterized in that In step (6), the etching temperature is controlled at 40-50°C.

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