Roller coating gluing process

Abstract

The invention relates to the technical field of crystal gluing, and particularly discloses a roller coating gluing process. The roller coating gluing process comprises the following steps: surface treatment; processing a coating layer; performing painting treatment; carrying out gluing treatment; carrying out deplating treatment; and cleaning. According to the method, a roller coating painting and gluing mode is adopted, the problem of non-uniformity possibly caused by an existing spraying mode is avoided, the thickness consistency and appearance quality of a paint layer are ensured, transition glue and curing glue are coated on the upper surface of the paint layer in a roller coating mode, good protection is provided for crystals, and the service life of the crystals is prolonged. Damage of an external environment and subsequent processes to a plating layer and a paint layer at the bottom of the crystal is reduced, and the appearance and glossiness of a crystal product are remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of crystal gluing, and particularly relates to a roll coating process. Background Art

[0002] As an ornament accessory, crystal is widely used in the fields of ornaments, handicrafts, clothing, footwear, etc. Its unique optical properties make it show gorgeous and shiny decorative effects in different fields. With the continuous growth of market demand, crystal processing technology is also constantly developing, especially remarkable progress has been made in shape manufacturing and surface treatment. The processing of crystal not only involves complex machining processes, but also covers key technologies such as coating and plating. The application of these technologies greatly improves the aesthetics and durability of crystal products.

[0003] In the process of crystal coating, the existing coating methods mainly include spraying treatment, manual coating and other methods. Among them, spraying treatment is one of the most common processes, and the paint or colloid is evenly sprayed on the crystal surface to achieve coating coverage; while manual coating relies on manual operation to directly apply the coating on the crystal surface. Although these methods meet the requirements of crystal processing to a certain extent, there are certain limitations. Whether it is spraying treatment or manual coating, it is difficult to ensure the uniformity of the coating in actual application. Especially in the process of treating the bottom surface of the crystal, problems such as uneven coating thickness and poor surface gloss are likely to occur, and even the phenomenon of crystal degumming and falling off occurs during use, affecting the overall appearance quality of crystal products. Summary of the Invention

[0004] In order to improve the uniformity and surface gloss of the crystal coating, reduce the degumming phenomenon of the crystal, and improve the overall appearance quality of the crystal, the present application provides a roll coating process.

[0005] A roll coating process provided by the present application adopts the following technical solutions: A roll coating process includes the following steps: S1: Surface treatment: Pretreat the crystal surface; S2: Coating layer treatment: Fix the crystal after surface treatment, and perform coating layer treatment on the table, crown facets and bottom surface of the crystal, so that a metal film layer adheres to the outer surface of the crystal; S3: Painting treatment: Use a roller to evenly apply paint on the bottom surface of the crystal, so that a paint layer is formed on the upper surface of the metal film layer on the bottom surface of the crystal; S4: Glue application treatment: After the paint layer on the bottom surface of the crystal dries, evenly apply the transition glue on the bottom surface of the crystal and perform photocuring for 20 - 40 s to form a transition layer on the upper surface of the paint layer on the bottom surface of the crystal. Then evenly apply the curing glue and conduct heat treatment at 120 - 130 °C for 1 - 2 h to form a curing layer on the upper surface of the transition layer; S5: Stripping treatment: Pour the crystal after the glue application treatment in step S4 into the stripping solution for stripping treatment; S6: Cleaning treatment: Rinse the crystal after the stripping treatment with clean water to obtain a crystal with a curing layer attached to the bottom surface.

[0006] By adopting the above technical solution, impurities can be effectively removed from the surface of the crystal after pretreatment, improving the adhesion of the subsequent coating layer. By applying a coating layer to the table, crown facets, and bottom surface of the crystal, a metal film layer is formed on the surface of the crystal. Among them, the metal film layer on the bottom surface of the crystal produces a mirror effect. When light refracts in the crystal and reaches the metal film layer, part of the light is reflected to improve the light reflection effect of the crystal. Additionally, since a small amount of paint or glue may flow onto the crown facets of the crystal during the subsequent painting and glue application processes, coating the table and crown facets of the crystal can protect the table and crown facets of the crystal, ensuring that the paint layer and transition glue on the crown facets can only adhere to the metal film layer and will not directly adhere to the crown facets of the crystal. Using a roller to evenly apply the paint on the bottom surface of the crystal avoids the unevenness problem that may occur in the existing spraying method, ensuring the thickness consistency and appearance quality of the paint layer. Moreover, part of the light passes through the metal film layer and is absorbed by the paint layer, and the paint layer can further enhance the gloss of the crystal. Subsequently, roll-coat the transition glue on the upper surface of the paint layer and use photocuring treatment to preliminarily cure the transition glue, increasing the viscosity of the transition layer and maintaining its good shape. Roll-coat the curing glue on the transition layer and use heat treatment to completely cure the transition glue and the curing glue, providing excellent protection performance for the crystal and reducing the damage to the bottom coating layer and paint layer of the crystal caused by the external environment and subsequent processes. Through the stripping treatment, the metal film layer, transition layer on the crown facets of the crystal, and the metal film layer on the table are removed together, making the crown facets and table of the crystal smooth and beautiful. The entire technological process is simple and efficient, significantly improving the appearance and gloss of the crystal product while ensuring the long-term service performance of the product.

[0007] Preferably, the components of the transition glue in step S4 include, by weight: 50 - 60 parts of polyurethane acrylate, 35 - 45 parts of aluminum powder, 8 - 12 parts of N,N - dimethylacrylamide, 1.2 - 1.4 parts of phenylbis(2,4,6 - trimethylbenzoyl)phosphine oxide, and 1.3 - 1.5 parts of azobisisobutyronitrile.

[0008] Preferably, the preparation method of the transition glue comprises the following steps: Mix polyurethane acrylate and N,N-dimethylacrylamide evenly, add phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide and azobisisobutyronitrile, and stir at 40-50 °C until the solid particles are completely dissolved. Then add aluminum powder, stir evenly to obtain the transition glue, and store it in the dark.

[0009] By adopting the above technical solution, the transition glue of the present application adopts a dual-curing method. Polyurethane acrylate is used as the reaction matrix, N,N-dimethylacrylamide is used as the active monomer, phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide is used as the photoinitiator, azobisisobutyronitrile is used as the thermal initiator, and aluminum powder is used as the filler. Specifically, polyurethane acrylate and N,N-dimethylacrylamide undergo a double-bond polymerization reaction under the action of the photoinitiator and light irradiation to complete the preliminary curing, thereby reducing the spontaneous spreading and collapse of aluminum particles. Since the presence of opaque aluminum powder will block the light radiation, resulting in unreacted monomers in the transition glue, these unreacted monomers complete the thermal cross-linking curing reaction under the action of the thermal initiator and heating, so that the transition glue is completely cured to obtain more excellent mechanical properties, heat resistance and use stability. In addition, using aluminum powder as the filler can further enhance the metallic luster of the crystal and further improve the aesthetic effect of the crystal product.

[0010] Preferably, the curing glue in step S4 is epoxy resin glue.

[0011] By adopting the above technical solution, using epoxy resin glue as the curing glue can effectively improve the adhesion and wear resistance of the curing layer. Epoxy resin glue has excellent bonding performance and mechanical strength, making the combination between the curing layer and the transition layer more firm. At the same time, it can form a stable chemical cross-linking structure during the heat treatment process, thereby enhancing the overall stability and durability of the crystal bottom coating and better protecting the internal metal film layer and paint layer.

[0012] Preferably, the thickness of the metal film layer is 1000-2000 nm, the thickness of the paint layer is 800-1000 nm, the thickness of the transition layer is 5000-10000 nm, and the thickness of the curing layer is 5000-10000 nm.

[0013] By adopting the above technical solutions, the thickness of the metal film layer is controlled within the range of 1000 - 2000 nm, which can ensure the best reflection performance on the surface of the crystal, while avoiding the cost increase caused by excessive thickness and the performance decline caused by too thin thickness; the thickness of the paint layer is controlled within the range of 800 - 1000 nm, which can effectively cover the metal film layer and provide good protection, while ensuring the uniformity and adhesion of the coating; the thickness range of the transition layer is 5000 - 10000 nm, which can form a stable connection layer between the paint layer and the curing layer, enhancing the adhesion ability of the curing glue; the thickness of the curing layer is also controlled within 5000 - 10000 nm, playing a protective role and ensuring the integrity and wear resistance of the bottom of the crystal, thus significantly improving the appearance quality and service life of the crystal product.

[0014] Preferably, the metal film layer in step S3 is a silver film layer or an aluminum film layer.

[0015] By adopting the above technical solutions, using a silver film layer or an aluminum film layer for the metal film layer can significantly improve the optical performance of the crystal, enhance the gloss and brightness of the crystal, and enable the crystal to show a more magnificent visual effect under different lighting conditions.

[0016] Preferably, the stripping solution in step S5 is alkaline water or nitric acid solution.

[0017] By adopting the above technical solutions, choosing alkaline water or nitric acid solution as the stripping solution can effectively remove the coating residues on the facets and table of the crystal crown, ensuring the cleanliness of the crystal surface.

[0018] Preferably, the specific steps of the surface treatment include: cleaning the surface of the crystal with a glass cleaning agent in an ultrasonic water tank, rinsing the crystal 3 - 5 times with high-purity water, and finally drying it at 70 - 80 °C and a humidity of 5 - 10% for 30 - 40 min.

[0019] By adopting the above technical solutions, impurities such as grease and dirt on the surface of the crystal can be effectively removed. Specifically, using a glass cleaning agent to clean the surface of the crystal in an ultrasonic water tank can utilize the cavitation effect of ultrasonic waves to improve the cleaning efficiency and ensure thorough cleaning of the crystal surface; then rinsing 3 - 5 times with high-purity water can further remove the residual cleaning agent and fine particles, avoiding defects in the subsequent coating layer treatment; finally, drying under specific temperature and humidity conditions can quickly evaporate the water and prevent water stains from remaining, thus providing a flat and clean base surface for the subsequent coating layer treatment and improving the appearance quality and coating adhesion of the final product.

[0020] This application has the following beneficial effects: In this application, after the surface of the crystal is pretreated, impurities can be effectively removed, and the adhesion of the subsequent coating layer can be improved. By coating the table, crown facets, and bottom surface of the crystal with a coating layer, a metal film layer is formed on the surface of the crystal. Among them, the metal film layer on the bottom surface of the crystal produces a mirror effect. When light refracts in the crystal and reaches the metal film layer when passing through the crystal, part of the light is reflected to improve the light reflection effect of the crystal. The metal film layers on the table and crown facets of the crystal play a role in protecting the table and crown facets of the crystal, so that the subsequent paint layer and transition glue on the crown facets can only adhere to the metal film layer and will not directly adhere to the crown facets of the crystal.

[0021] A roller is used to evenly apply the paint on the bottom surface of the crystal, avoiding the unevenness problem that may occur in the existing spraying method, ensuring the thickness consistency and appearance quality of the paint layer. Moreover, part of the light passes through the metal film layer and is absorbed by the paint layer, and the paint layer can further enhance the luster of the crystal.

[0022] The transition glue is roll-coated on the upper surface of the paint layer, and light-curing treatment is used to preliminarily cure the transition glue to increase the viscosity of the transition layer and keep its good shape. The curing glue is roll-coated on the transition layer, and heat treatment is used to completely cure the transition glue and the curing glue, providing excellent protection performance for the crystal and reducing the damage of the external environment and subsequent processes to the bottom coating layer and paint layer of the crystal.

[0023] Through the stripping treatment, the metal film layer, transition layer on the crown facets of the crystal, and the metal film layer on the table are removed together, so that the crown facets and table of the crystal remain smooth and beautiful. Specific embodiments

[0024] The following further details the present application in conjunction with embodiments.

[0025] In the following specific embodiments, the sources of some substances are shown in Table 1.

[0026] Table 1 Polyurethane acrylate Hubei Yamaide Biopharmaceutical Co., Ltd. N,N-Dimethylacrylamide Best 2680-03-7 Phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide Best 162881-26-7 Azobisisobutyronitrile Taixi Chemical Industry 78-67-1 Embodiment

[0027] Embodiment 1 A roll-coating and gluing process specifically includes the following steps: S1: Surface treatment: The surface of the crystal is cleaned in an ultrasonic water tank with a glass cleaner for 3 minutes, rinsed with high-purity water three times, and finally dried at 70°C and a humidity of 5% for 30 minutes.

[0028] S2: Coating layer treatment: Place the surface-treated crystal on a plastic suction sheet for fixation, and perform coating layer treatment on the table, crown facets, and bottom surface of the crystal, so that a metal film layer with a thickness of 1000 nm adheres to the outer surface of the crystal. Among them, the metal film layer in this embodiment is a silver film layer.

[0029] S3: Painting treatment: Use a roller to evenly apply paint on the bottom surface of the crystal, so that a paint layer with a thickness of 800 nm is formed on the upper surface of the metal film layer on the bottom surface of the crystal.

[0030] S4: Gluing treatment: After the paint layer on the bottom surface of the crystal dries, use a roller to evenly apply transition glue on the bottom surface of the crystal, and cure it with a UV lamp for 20 s with ultraviolet light, so that a transition layer with a thickness of 5000 nm is formed on the upper surface of the paint layer on the bottom surface of the crystal. Then evenly apply curing glue and heat-treat it at 120 °C for 1 h, so that a curing layer with a thickness of 5000 nm is formed on the upper surface of the transition layer.

[0031] Among them, the preparation method of the transition glue is: Mix 500 g of polyurethane acrylate and 80 g of N,N-dimethylacrylamide evenly, add 12 g of phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide and 13 g of azobisisobutyronitrile, and stir at 40 - 50 °C until the solid particles are completely dissolved. Then add 350 g of aluminum powder, stir evenly to obtain the transition glue, and store it away from light.

[0032] Among them, the curing glue uses epoxy resin glue, sourced from Huayu 61788-97-4.

[0033] S5: Stripping treatment: Pour the crystal after gluing treatment in step S4 into a nitric acid solution for stripping. S6: Cleaning treatment: After stripping is completed, rinse the crystal with clean water and dry it to obtain a crystal with a curing layer attached to the bottom surface.

[0034] Example 2 A roller gluing process specifically includes the following steps: S1: Surface treatment: Clean the surface of the crystal with a glass cleaner in an ultrasonic water tank for 4 min, rinse the crystal 4 times with high-purity water, and finally dry it at 75 °C and 8% humidity for 35 min.

[0035] S2: Coating layer treatment: Place the surface-treated crystal on a plastic suction sheet for fixation, and perform coating layer treatment on the table, crown facets, and bottom surface of the crystal, so that a metal film layer with a thickness of 1500 nm adheres to the outer surface of the crystal. Among them, the metal film layer in this embodiment is an aluminum film layer.

[0036] S3: Painting treatment: Use a roller to evenly apply paint on the bottom surface of the crystal, so that a paint layer with a thickness of 900 nm is formed on the upper surface of the metal film layer on the bottom surface of the crystal.

[0037] S4: Gluing treatment: After the paint layer on the bottom surface of the crystal dries, use a roller to evenly apply transition glue on the bottom surface of the crystal, and cure it with UV light for 30 s using a UV lamp, so that a transition layer with a thickness of 8000 nm is formed on the upper surface of the paint layer on the bottom surface of the crystal. Then, evenly apply curing glue and heat-treat it at 125 °C for 1.5 h, so that a curing layer with a thickness of 8000 nm is formed on the upper surface of the transition layer.

[0038] Among them, the preparation method of the transition glue is: Mix 550 g of polyurethane acrylate and 100 g of N,N-dimethylacrylamide evenly, add 13 g of phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide and 14 g of azobisisobutyronitrile, and stir at 45 °C until the solid particles are completely dissolved. Then add 400 g of aluminum powder, stir evenly to obtain the transition glue, and store it away from light.

[0039] Among them, the curing glue uses epoxy resin glue, which is sourced from Huayu 61788-97-4.

[0040] S5: Stripping treatment: Pour the crystal after the gluing treatment in step S4 into alkaline water for stripping. S6: Cleaning treatment: After the stripping is completed, rinse the crystal with clean water and dry it to obtain a crystal with a curing layer attached to the bottom surface.

[0041] Example 3 A roll coating and gluing process specifically includes the following steps: S1: Surface treatment: Clean the surface of the crystal in an ultrasonic water tank with glass cleaner for 5 min, rinse the crystal 5 times with high-purity water, and finally dry it at 80 °C and 10% humidity for 40 min.

[0042] S2: Coating layer treatment: Place the crystal after surface treatment on a plastic suction sheet for fixation, and perform coating layer treatment on the table, crown facets and bottom surface of the crystal, so that a metal film layer with a thickness of 2000 nm is attached to the outer surface of the crystal. Among them, the metal film layer in this example is a silver film layer.

[0043] S3: Painting treatment: Use a roller to evenly apply paint on the bottom surface of the crystal, so that a paint layer with a thickness of 1000 nm is formed on the upper surface of the metal film layer on the bottom surface of the crystal.

[0044] S4: Gluing treatment: After the paint layer on the bottom surface of the crystal is dried, use a roller to evenly apply the transition glue on the bottom surface of the crystal, and use a UV lamp for ultraviolet curing for 40 s to form a transition layer with a thickness of 10,000 nm on the upper surface of the paint layer on the bottom surface of the crystal. Then evenly apply the curing glue and heat-treat it at 130 °C for 2 h to form a curing layer with a thickness of 10,000 nm on the upper surface of the transition layer.

[0045] Among them, the preparation method of the transition glue is: Mix 600 g of polyurethane acrylate and 120 g of N,N-dimethylacrylamide evenly, add 14 g of phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide and 15 g of azobisisobutyronitrile, and stir at 50 °C until the solid particles are completely dissolved. Then add 450 g of aluminum powder, stir evenly to obtain the transition glue, and store it away from light.

[0046] Among them, the curing glue uses epoxy resin glue, sourced from Huayu 61788-97-4.

[0047] S5: Stripping treatment: Pour the crystal after the gluing treatment in step S4 into a nitric acid solution for stripping. S6: Cleaning treatment: After the stripping is completed, rinse the crystal with clean water and dry it to obtain the crystal with a curing layer attached to the bottom surface.

[0048] Example 4 The difference between this example and Example 2 is that phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide is not added to the transition glue in step S4.

[0049] Example 5 The difference between this example and Example 2 is that azobisisobutyronitrile is not added to the transition glue in step S4.

[0050] Comparative example Comparative example 1 A roller coating and gluing process, different from Example 2 in that step S4 is replaced with: Gluing treatment: After the paint layer on the bottom surface of the crystal is dried, use a roller to evenly apply the curing glue on the bottom surface of the crystal, and heat-treat it at 85 °C for 1.5 h to form a curing layer with a thickness of 8,000 nm on the upper surface of the paint layer.

[0051] Among them, the curing glue uses epoxy resin glue, sourced from Huayu 61788-97-4.

[0052] Comparative example 2 A roller coating and gluing process, different from Example 2 in that the curing glue uses UV glue, and step S4 is replaced with: Gluing treatment: After the paint layer on the bottom surface of the crystal dries, use a roller to evenly apply the transition glue on the bottom surface of the crystal, and use a UV lamp for ultraviolet curing for 30 s to form a transition layer with a thickness of 8000 nm on the upper surface of the paint layer on the bottom surface of the crystal. Then evenly apply the curing glue and use a UV lamp for ultraviolet curing for 3 min to form a curing layer with a thickness of 8000 nm on the upper surface of the transition layer.

[0053] Among them, the preparation method of the transition glue is as follows: Mix 550 g of polyurethane acrylate and 100 g of N,N-dimethylacrylamide evenly, add 13 g of phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide and 14 g of azobisisobutyronitrile, and stir at 45 °C until the solid particles are completely dissolved. Then add 400 g of aluminum powder, stir evenly to obtain the transition glue, and store it away from light.

[0054] Comparative Example 3 A roller gluing process, which is different from Example 2 in that the aluminum powder in the transition glue component is replaced by nano-SiO2. That is, the preparation method of the transition glue is as follows: Mix 550 g of polyurethane acrylate and 100 g of N,N-dimethylacrylamide evenly, add 13 g of phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide and 14 g of azobisisobutyronitrile, and stir at 45 °C until the solid particles are completely dissolved. Then add 400 g of nano-SiO2, stir evenly to obtain the transition glue, and store it away from light.

[0055] Comparative Example 4 A roller gluing process, which is different from Example 2 in that no surface treatment is carried out.

[0056] Performance detection test Preparation of the spline: Evenly coat the paint on the surface of the spline to form a paint layer with a thickness of 900 nm. Prepare the splines according to the gluing treatment methods in Examples 1-5 and Comparative Examples 1-4 for performance testing, and the results are recorded in Table 2.

[0057] Tensile strength and elongation at break test: Conduct the tensile strength and elongation at break tests according to the GB / T1040 standard.

[0058] Peel strength test: Place the sample in a constant temperature oven at 23 °C for 12 hours, cut the sample into splines with a width of 25 mm, use a tensile rate of 100 mm / min and a peel angle of 180°, and the test result is the average value of 3 parallel splines to obtain the peel strength. The test results are recorded in Table 2.

[0059] Thermogravimetric test: The thermogravimetric analyzer (NETZSCH TGA851) was used to characterize the thermal stability of the cured adhesive layer. Determination conditions: Weigh 2 - 5 mg of the sample and place it in an alumina crucible. Under a high-purity N2 atmosphere, the heating rate is 20 °C / min -1 , and the measurement temperature is 120 °C.

[0060] Table 2 According to the data in Example 2, Examples 4 - 5, and Table 2, it can be seen that the transition adhesives in Examples 4 and 5 are both in a single curing mode. In Example 4, no photoinitiator was added, and in Example 5, no thermal initiator was added, resulting in relatively poor performance of the crystal after gluing. However, the transition adhesive of the present application adopts a dual curing mode, which not only enables the transition adhesive to be completely cured, but also improves the bonding strength between the paint layer, the transition layer, and the cured layer, obtaining more excellent mechanical properties and durability, and improving the use stability and aesthetic effect of the crystal.

[0061] According to the data in Example 2 and Comparative Example 1, and Table 2, it can be seen that in Comparative Example 1, the curing adhesive was directly applied on the paint layer. Since the bonding strength between the cured layer formed after the curing adhesive is cured and the paint layer is weak, there may be a situation of glue detachment, thus damaging the paint layer of the crystal and affecting the gloss and appearance quality of the crystal. By adding a transition layer on the paint layer in the present application, the bonding strength of the subsequent curing adhesive is enhanced, the protection of the cured layer on the paint layer is improved, and the gloss and appearance quality of the crystal are effectively enhanced.

[0062] According to the data in Example 2 and Comparative Example 2, and Table 2, it can be seen that the curing adhesive in Comparative Example 2 uses a UV adhesive, and the cured layer is cured by a photo-curing method, which will cause the transition adhesive inside the cured layer not to be completely cured, thus affecting the bonding strength between the paint layer and the transition layer. However, the curing adhesive of the present application uses an epoxy resin adhesive and combines with a thermal curing method, enabling the transition adhesive and the curing adhesive to be completely cured, and firmly bonding both with the paint layer, not easily resulting in glue detachment, and forming an effective protection for the paint layer and the metal film layer.

[0063] According to the data in Example 2 and Comparative Example 3, and Table 2, it can be seen that in Comparative Example 3, the aluminum powder was replaced with nano-SiO2. Since the surface energy of nano-SiO2 is higher than that of aluminum powder, it is prone to aggregation, thus affecting the performance of the transition adhesive. The filling of aluminum powder in the present application not only has better dispersibility, but also can further enhance the metallic luster of the crystal and further improve the aesthetic effect of the crystal product.

[0064] According to the data in Example 2 and Comparative Example 4, and Table 2, it can be seen that impurities on the surface of the crystal will cause the glue layer and the paint layer to fall off. However, after the surface of the crystal in the present application is pretreated, impurities can be effectively removed, improving the adhesion of the subsequent film layer.

[0065] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A roll coating and gluing process, characterized in that, It includes the following steps: S1: Surface treatment: Pretreat the surface of the crystal; S2: Coating layer treatment: Fix the crystal after surface treatment, and perform coating layer treatment on the table, crown facets and bottom surface of the crystal, so that a metal film layer adheres to the outer surface of the crystal; S3: Painting treatment: Use a roller to evenly apply paint on the bottom surface of the crystal, so that a paint layer is formed on the upper surface of the metal film layer on the bottom surface of the crystal; S4: Gluing treatment: After the paint layer on the bottom surface of the crystal dries, evenly apply transition glue on the bottom surface of the crystal, and perform photo-curing for 20 - 40 s, so that a transition layer is formed on the upper surface of the paint layer on the bottom surface of the crystal, then evenly apply curing glue, and heat-treat at 120 - 130 °C for 1 - 2 h, so that a curing layer is formed on the upper surface of the transition layer; S5: Stripping treatment: Pour the crystal after gluing treatment in step S4 into a stripping solution for stripping treatment; S6: Cleaning treatment: Rinse the crystal after stripping treatment with clean water to obtain a crystal with a curing layer attached to the bottom surface.

2. The roll coating and gluing process according to claim 1, characterized in that, The components of the transition glue in step S4 include, by weight: 50 - 60 parts of polyurethane acrylate, 35 - 45 parts of aluminum powder, 8 - 12 parts of N,N-dimethylacrylamide, 1.2 - 1.4 parts of phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide, and 1.3 - 1.5 parts of azobisisobutyronitrile.

3. The roll coating and gluing process according to claim 2, characterized in that, The preparation method of the transition glue includes the following steps: Mix polyurethane acrylate and N,N-dimethylacrylamide evenly, add phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide and azobisisobutyronitrile, stir at 40 - 50 °C until the solid particles are completely dissolved, add aluminum powder, stir evenly to obtain the transition glue, and store it away from light.

4. A roll coating and gluing process according to claim 1, characterized in that, The curing glue in step S4 is an epoxy resin glue.

5. A roll coating and gluing process according to claim 1, characterized in that, The thickness of the metal film layer is 1000 - 2000 nm, the thickness of the paint layer is 800 - 1000 nm, the thickness of the transition layer is 5000 - 10000 nm, and the thickness of the curing layer is 5000 - 10000 nm.

6. A roll coating and gluing process according to claim 1, characterized in that, The metal film layer in step S3 is a silver film layer or an aluminum film layer.

7. A roll coating and gluing process according to claim 1, characterized in that, The stripping solution in step S5 is an alkaline water or a nitric acid solution.

8. A roll coating and gluing process according to claim 1, characterized in that, The specific steps of the surface treatment include: Clean the surface of the crystal with a glass cleaner in an ultrasonic water tank, rinse the crystal with high-purity water for 3 - 5 times, and finally dry it at 70 - 80 °C and a humidity of 5 - 10% for 30 - 40 min.

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