A roll-on adhesive application process

Abstract

The application relates to the technical field of water crystal gluing, and particularly discloses a roll-coating gluing process, which comprises the following steps: surface treatment, coating layer treatment, paint application treatment, gluing treatment, coating removal treatment and cleaning treatment. The roll-coating paint application gluing mode is adopted, the uneven problem possibly caused by the existing spraying mode is avoided, the thickness consistency and appearance quality of the paint layer are ensured, and the water crystal is provided with good protection by the roll-coating transition glue and solidified glue on the upper surface of the paint layer, the damage of the coating layer and the paint layer on the bottom of the water crystal caused by the external environment and subsequent processes is reduced, and the appearance and glossiness of the water crystal product are remarkably improved.

Description

Technical Field

[0001] The invention relates to the technical field of crystal gluing, in particular to a roll-coating gluing process. Background Art

[0002] Crystal is widely used as a decorative accessory in jewelry, crafts, clothing, footwear, and other fields. Its unique optical properties enable it to create a gorgeous, sparkling decorative effect in various fields. With the continuous growth of market demand, crystal processing technology has also been continuously developing, especially in the field of shape manufacturing and surface treatment. Crystal processing not only involves complex mechanical processing techniques but also includes key technologies such as coating and plating. The application of these technologies has greatly enhanced the aesthetics and durability of crystal products.

[0003] In the crystal coating process, existing coating methods mainly include spraying and manual application. Spraying is one of the most common processes, which involves evenly spraying paint or colloid onto the crystal surface to achieve coating coverage. Manual application, on the other hand, relies on manual operation, applying the paint directly to the crystal surface. While these methods meet the needs of crystal processing to a certain extent, they have certain limitations. Whether spraying or manual application, it is difficult to ensure coating uniformity in actual application. This is especially true when treating the bottom surface of the crystal. Problems such as uneven coating thickness and poor surface gloss are prone to occur. The crystal may even debond and fall off during use, affecting the overall appearance quality of the crystal product. 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 roller coating gluing process.

[0005] The present application provides a roll coating process, which adopts the following technical solutions:

[0006] A roll-coating gluing process comprises the following steps:

[0007] S1: Surface treatment: pre-treat the crystal surface;

[0008] S2: Coating treatment: Fix the surface-treated crystal and perform coating treatment on the table, crown facets and bottom surface of the crystal, so that a layer of metal film is attached to the outer surface of the crystal;

[0009] S3: Painting: Use a roller to evenly apply paint to 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;

[0010] S4: After the paint layer on the bottom surface of the crystal is dried, transition glue is evenly applied to the bottom surface of the crystal, and light curing is performed for 20-40s, so that a transition layer is formed on the upper surface of the paint layer on the bottom surface of the crystal, and then curing glue is evenly applied, and heating treatment is performed at 120-130℃ for 1-2h, so that a curing layer is formed on the upper surface of the transition layer;

[0011] S5: After the crystal after the glue treatment in step S4 is poured into the stripping solution for stripping treatment;

[0012] S6: After the crystal after the stripping treatment is washed with clean water, a crystal with a curing layer attached to the bottom surface is obtained.

[0013] By adopting the above technical scheme, the surface of the crystal can effectively remove impurities after pretreatment, and improve the adhesion of the subsequent film layer. By treating the mesa, crown surface and bottom surface of the crystal with a film layer, a metal film layer is formed on the surface of the crystal. The metal film layer on the bottom surface of the crystal produces a mirror effect, and light is refracted in the crystal. When the light penetrates the crystal to reach the metal film layer, part of the light is reflected to improve the light reflection effect of the crystal. In addition, a small amount of paint or glue may flow to the crown surface of the crystal during subsequent painting and gluing processes. Therefore, the mesa and crown surface of the crystal are plated with a film to protect the mesa and crown surface of the crystal. The paint layer and transition glue on the crown surface can only be attached to the metal film layer, but not directly attached to the crown surface of the crystal. The paint is evenly applied to the bottom surface of the crystal by a roller, avoiding the uneven problem that may be caused by the existing spraying method, ensuring the thickness consistency and appearance quality of the paint layer, and part of the light penetrates the metal film layer and is absorbed by the paint layer. The paint layer can further enhance the gloss of the crystal. Then, the transition glue is rolled on the upper surface of the paint layer, and the transition glue is preliminarily cured by light curing treatment to increase the viscosity of the transition layer and maintain good appearance. The solidified glue is rolled on the transition layer, and the transition glue and the solidified glue are completely cured by heating treatment to provide excellent protection for the crystal, reducing damage to the plated layer and paint layer on the bottom of the crystal caused by external environment and subsequent processes. Through stripping treatment, the metal film layer on the crown surface of the crystal, the transition layer and the metal film layer on the mesa are removed, so that the crown surface and the mesa of the crystal remain smooth and beautiful. The whole process is simple and efficient, which significantly improves the appearance and gloss of the crystal product, and ensures the long-term use performance of the product.

[0014] Preferably, the components of the transition glue in step S4 include, by weight: polyurethane acrylate 50-60 parts, aluminum powder 35-45 parts, N,N-dimethyl acrylamide 8-12 parts, phenyl bis(2,4,6-trimethylbenzoyl) phosphine oxide 1.2-1.4 parts, azobisisobutyronitrile 1.3-1.5 parts.

[0015] Preferably, the preparation method of the transition glue comprises the following steps:

[0016] Mix polyurethane acrylate and N,N-dimethylacrylamide evenly, add phenyl bis(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 a transition glue, and store in the dark.

[0017] By adopting the above technical solution, the transition glue of the present application adopts a dual curing method, with polyurethane acrylate as the reaction matrix, N,N-dimethylacrylamide as the active monomer, phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide as the photoinitiator, azobisisobutyronitrile as the thermal initiator, and aluminum powder 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 initial curing, thereby reducing the spontaneous spreading and collapse of the aluminum particles. Since the presence of opaque aluminum powder will block light radiation, resulting in the appearance of insufficiently reacted monomers in the transition glue, these insufficiently reacted 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 better mechanical properties, heat resistance and stability in use. In addition, the use of aluminum powder as a filler can further enhance the metallic gloss of the crystal and further improve the aesthetic effect of the crystal product.

[0018] Preferably, the curing glue in step S4 is epoxy resin glue.

[0019] By adopting the above technical solution and using epoxy resin as the curing adhesive, the adhesion and wear resistance of the cured layer can be effectively improved. Epoxy resin adhesive has excellent bonding properties and mechanical strength, which makes the bond between the cured layer and the transition layer more solid. At the same time, it can form a stable chemical cross-linking structure during the heating process, thereby improving the overall stability and durability of the crystal bottom coating and better protecting the internal metal film layer and paint layer.

[0020] 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 solidified layer is 5000-10000 nm.

[0021] By adopting the above technical solution, the thickness of the metal film layer is controlled within the range of 1000-2000nm, which can ensure that the reflective performance of the crystal surface achieves the best effect, while avoiding the cost increase caused by excessive thickness and the performance degradation caused by too thin; the thickness of the paint layer is controlled within the range of 800-1000nm, which can effectively cover the metal film layer and provide good protection, while ensuring the uniformity and adhesion of the coating; the thickness of the transition layer is in the range of 5000-10000nm, which can form a stable connecting layer between the paint layer and the cured layer, enhancing the adhesion ability of the cured glue; the thickness of the cured layer is also controlled within the range of 5000-10000nm, which plays a protective role, ensuring the integrity and wear resistance of the bottom of the crystal, thereby significantly improving the appearance quality and service life of the crystal products.

[0022] Preferably, the metal film layer in step S3 is a silver film layer or an aluminum film layer.

[0023] By adopting the above technical solution, the metal film layer uses a silver film layer or an aluminum film layer, which can significantly improve the optical properties of the crystal, enhance the gloss and brightness of the crystal, and enable the crystal to show a more gorgeous visual effect under different lighting conditions.

[0024] Preferably, the stripping solution in step S5 is alkaline water or nitric acid solution.

[0025] By adopting the above technical solution, alkaline water or nitric acid solution is used as the deplating solution, which can effectively remove the plating residue on the crystal crown facets and table, ensuring the cleanliness of the crystal surface.

[0026] Preferably, the specific steps of the surface treatment include: cleaning the crystal surface with a glass cleaner in an ultrasonic water tank, rinsing the crystal with high-purity water for 3-5 times, and finally drying at 70-80° C. and 5-10% humidity for 30-40 minutes.

[0027] By adopting the above technical solution, impurities such as grease and dirt on the crystal surface can be effectively removed. Specifically, using glass cleaner to clean the crystal surface in an ultrasonic water tank can improve cleaning efficiency by utilizing the cavitation effect of ultrasound, ensuring that the crystal surface is thoroughly cleaned. Subsequently, rinsing with high-purity water for 3-5 times can further remove residual cleaning agent and tiny particles, avoiding defects in subsequent coating processes. Finally, drying under specific temperature and humidity conditions can quickly evaporate water and prevent residual water stains, thereby providing a smooth and clean base surface for subsequent coating processes, improving the appearance quality and coating adhesion of the final product.

[0028] This application has the following beneficial effects:

[0029] In the present application, the crystal surface is pre-treated to effectively remove impurities and improve the adhesion of subsequent coating layers. By coating the crystal's table, crown facets, and bottom surface, a metal film layer is formed on the crystal surface. The metal film layer on the bottom surface of the crystal produces a mirror effect, and light is refracted in the crystal. When the light penetrates the crystal and reaches the metal film layer, part of the light is reflected to improve the crystal's reflective effect. The metal film layer on the crystal table and crown facets protects the crystal table and crown facets, so that the subsequent paint layer and transition glue on the crown facet can only adhere to the metal film layer, and will not directly adhere to the crystal's crown facets.

[0030] Using a roller to evenly apply paint to the bottom surface of the crystal avoids the unevenness that may be caused by existing spraying methods, ensuring the thickness consistency and appearance quality of the paint layer. In addition, part of the light passes through the metal film layer and is absorbed by the paint layer, which can further enhance the gloss of the crystal.

[0031] Roll the transition glue on the surface of the paint layer, and use light curing treatment to initially cure the transition glue, increase the viscosity of the transition layer, and keep it in good shape. Roll the curing glue on the transition layer, and use heating treatment to completely cure the transition glue and curing glue, which provides excellent protection for the crystal and reduces damage to the crystal bottom coating and paint layer caused by the external environment and subsequent processes.

[0032] Through the stripping treatment, the metal film layer, transition layer and metal film layer on the crystal crown facets are removed together, so that the crystal crown facets and table remain smooth and beautiful. DETAILED DESCRIPTION

[0033] The present application is further described in detail below with reference to the embodiments.

[0034] The sources of some substances in the following specific embodiments are shown in Table 1.

[0035] Table 1

[0036] polyurethane acrylate Hubei Yamade Biopharmaceutical Co., Ltd. N,N-dimethylacrylamide Bost 2680-03-7 Phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide Bost 162881-26-7 Azobisisobutyronitrile Taixi Chemical 78-67-1

[0037] Example

[0038] Example 1

[0039] A roll coating gluing process specifically comprises the following steps:

[0040] S1: Surface treatment: Clean the crystal surface with glass cleaner in an ultrasonic water tank for 3 minutes, rinse the crystal with high-purity water for 3 times, and finally dry it at 70°C and 5% humidity for 30 minutes.

[0041] S2: Coating: The surface-treated crystal is placed on a plastic film and fixed. The table, crown facets, and base of the crystal are coated with a 1000 nm thick metal film on the outer surface of the crystal. In this embodiment, the metal film is a silver film.

[0042] S3: Painting: Use a roller to evenly apply paint to the bottom surface of the crystal, so that a paint layer with a thickness of 800nm ​​is formed on the upper surface of the metal film layer on the bottom surface of the crystal.

[0043] S4: Gluing: After the paint layer on the bottom of the crystal is dry, use a roller to evenly apply transition glue to the bottom of the crystal, and use a UV lamp to ultraviolet cure for 20 seconds to form a transition layer with a thickness of 5000nm on the upper surface of the paint layer on the bottom of the crystal. Then evenly apply curing glue and heat it at 120℃ for 1 hour to form a cured layer with a thickness of 5000nm on the upper surface of the transition layer.

[0044] The preparation method of the transition glue is as follows: 500g of polyurethane acrylate and 80g of N,N-dimethylacrylamide are mixed evenly, 12g of phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide and 13g of azobisisobutyronitrile are added, and the mixture is stirred at 40-50°C until the solid particles are completely dissolved, 350g of aluminum powder is added, and the mixture is stirred evenly to obtain the transition glue, which is then stored in the dark.

[0045] Among them, the curing glue uses epoxy resin glue, which comes from Huayu 61788-97-4.

[0046] S5: Stripping treatment: Pour the crystal after the glue treatment in step S4 into nitric acid solution for stripping;

[0047] S6: Cleaning: After stripping is completed, rinse the crystal with clean water and dry it to obtain a crystal with a solidified layer attached to the bottom surface.

[0048] Example 2

[0049] A roll coating gluing process specifically comprises the following steps:

[0050] S1: Surface treatment: Clean the crystal surface with glass cleaner in an ultrasonic water tank for 4 minutes, rinse the crystal with high-purity water 4 times, and finally dry it at 75°C and 8% humidity for 35 minutes.

[0051] S2: Coating: The surface-treated crystal is placed on a plastic film and fixed. The table, crown facets, and base of the crystal are coated with a 1500 nm thick metal film. In this embodiment, the metal film is an aluminum film.

[0052] S3: Painting: Use a roller to evenly apply paint to the bottom surface of the crystal, so that a paint layer with a thickness of 900nm is formed on the upper surface of the metal film layer on the bottom surface of the crystal.

[0053] S4: Gluing: After the paint layer on the bottom of the crystal is dry, use a roller to evenly apply transition glue to the bottom of the crystal, and use a UV lamp to cure it for 30 seconds, so that a transition layer with a thickness of 8000nm is formed on the upper surface of the paint layer on the bottom of the crystal. Then evenly apply curing glue, and heat it at 125℃ for 1.5 hours, so that a cured layer with a thickness of 8000nm is formed on the upper surface of the transition layer.

[0054] The preparation method of the transition glue is as follows: 550g of polyurethane acrylate and 100g of N,N-dimethylacrylamide are mixed evenly, 13g of phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide and 14g of azobisisobutyronitrile are added, and the mixture is stirred at 45°C until the solid particles are completely dissolved, 400g of aluminum powder is added, and the mixture is stirred evenly to obtain the transition glue, which is then stored in the dark.

[0055] Among them, the curing glue uses epoxy resin glue, which comes from Huayu 61788-97-4.

[0056] S5: Stripping treatment: pouring the crystal after the glue treatment in step S4 into alkaline water for stripping;

[0057] S6: Cleaning: After stripping is completed, rinse the crystal with clean water and dry it to obtain a crystal with a solidified layer attached to the bottom surface.

[0058] Example 3

[0059] A roll coating gluing process specifically comprises the following steps:

[0060] S1: Surface treatment: Clean the crystal surface with glass cleaner in an ultrasonic water tank for 5 minutes, rinse the crystal with high-purity water for 5 times, and finally dry it at 80°C and 10% humidity for 40 minutes.

[0061] S2: Coating: The surface-treated crystal is placed on a plastic film and fixed. The table, crown facets, and base of the crystal are coated with a 2000 nm thick metal film on the outer surface of the crystal. In this embodiment, the metal film is a silver film.

[0062] S3: Painting: Use a roller to evenly apply paint to the bottom surface of the crystal, so that a paint layer with a thickness of 1000nm is formed on the upper surface of the metal film layer on the bottom surface of the crystal.

[0063] S4: Gluing: After the paint layer on the bottom of the crystal is dry, use a roller to evenly apply transition glue to the bottom of the crystal, and use a UV lamp to cure it for 40 seconds, so that a transition layer with a thickness of 10,000 nm is formed on the upper surface of the paint layer on the bottom of the crystal. Then evenly apply curing glue, and heat it at 130°C for 2 hours, so that a cured layer with a thickness of 10,000 nm is formed on the upper surface of the transition layer.

[0064] The preparation method of the transition glue is as follows: 600g of polyurethane acrylate and 120g of N,N-dimethylacrylamide are mixed evenly, 14g of phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide and 15g of azobisisobutyronitrile are added, and the mixture is stirred at 50°C until the solid particles are completely dissolved, 450g of aluminum powder is added, and the mixture is stirred evenly to obtain the transition glue, which is then stored in the dark.

[0065] Among them, the curing glue uses epoxy resin glue, which comes from Huayu 61788-97-4.

[0066] S5: Stripping treatment: Pour the crystal after the glue treatment in step S4 into nitric acid solution for stripping;

[0067] S6: Cleaning: After stripping is completed, rinse the crystal with clean water and dry it to obtain a crystal with a solidified layer attached to the bottom surface.

[0068] Example 4

[0069] The difference between this embodiment and embodiment 2 is that no phenyl bis(2,4,6-trimethylbenzoyl)phosphine oxide is added to the transition glue in step S4.

[0070] Example 5

[0071] The difference between this embodiment and embodiment 2 is that no azobisisobutyronitrile is added to the transition glue in step S4.

[0072] Comparative Example

[0073] Comparative Example 1

[0074] A roll coating gluing process, which differs from Example 2 in that step S4 is replaced by:

[0075] Gluing treatment: After the paint layer on the bottom of the crystal is dry, use a roller to evenly apply the curing glue to the bottom of the crystal, and heat it at 85℃ for 1.5h to form a cured layer with a thickness of 8000nm on the upper surface of the paint layer.

[0076] Among them, the curing glue uses epoxy resin glue, which comes from Huayu 61788-97-4.

[0077] Comparative Example 2

[0078] A roller coating process is different from Example 2 in that UV glue is used for curing glue, and step S4 is replaced by:

[0079] Gluing treatment: After the paint layer on the bottom of the crystal is dry, use a roller to evenly apply transition glue to the bottom of the crystal, and use a UV lamp to cure it for 30 seconds, so that a transition layer with a thickness of 8000nm is formed on the upper surface of the paint layer on the bottom of the crystal. Then evenly apply curing glue, and use a UV lamp to cure it for 3 minutes, so that a cured layer with a thickness of 8000nm is formed on the upper surface of the transition layer.

[0080] The preparation method of the transition glue is as follows: 550g of polyurethane acrylate and 100g of N,N-dimethylacrylamide are mixed evenly, 13g of phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide and 14g of azobisisobutyronitrile are added, and the mixture is stirred at 45°C until the solid particles are completely dissolved, 400g of aluminum powder is added, and the mixture is stirred evenly to obtain the transition glue, which is then stored in the dark.

[0081] Comparative Example 3

[0082] A roller coating process is different from Example 2 in that the aluminum powder in the transition glue component is replaced with nano-SiO2, that is, the preparation method of the transition glue is:

[0083] Mix 550g of polyurethane acrylate and 100g of N,N-dimethylacrylamide evenly, add 13g of phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide and 14g of azobisisobutyronitrile, stir at 45°C until the solid particles are completely dissolved, add 400g of nano-SiO2, stir evenly to obtain a transition glue, and store in the dark.

[0084] Comparative Example 4

[0085] A roller coating gluing process, which differs from Example 2 in that no surface treatment is performed.

[0086] Performance testing

[0087] Preparation of specimens:

[0088] The paint was evenly coated on the surface of the sample to form a paint layer with a thickness of 900 nm. Samples were prepared according to the sizing treatment methods in Examples 1-5 and Comparative Examples 1-4 and performance tests were performed. The results are recorded in Table 2.

[0089] Tensile strength and elongation at break test: Tensile strength and elongation at break test are carried out in accordance with GB / T1040 standard.

[0090] Peel strength test: Place the sample in a constant temperature box at 23°C for 12 hours, cut it into strips with a width of 25 mm, use a tensile rate of 100 mm / min, and a peel angle of 180°. The test result is the average value of three parallel strips to obtain the peel strength. The test results are recorded in Table 2.

[0091] Thermal gravimetric analysis: The thermal stability of the cured adhesive layer was characterized using a thermogravimetric analyzer (NETZSCH TGA851). Test conditions: 2-5 mg of sample, alumina crucible, high-purity N2 atmosphere, heating rate of 20°C min -1 , measuring temperature 120℃.

[0092] Table 2

[0093]

[0094] According to Examples 2 and 4-5, as well as the data in Table 2, the transition adhesives in Examples 4 and 5 were cured using a single curing method. No photoinitiator was added in Example 4, and no thermal initiator was added in Example 5. This resulted in relatively poor performance of the crystal after the coating. The transition adhesive of the present application, however, uses a dual curing method, which not only allows the transition adhesive to fully cure but also improves the bonding strength between the paint layer, transition layer, and cured layer, resulting in superior mechanical properties and durability, and enhancing the stability and aesthetics of the crystal.

[0095] According to Example 2 and Comparative Example 1 and the data in Table 2, in Comparative Example 1, the curing adhesive is directly applied on the paint layer. Due to the weak bonding strength between the cured layer formed after the curing adhesive cures and the paint layer, debonding may occur, thereby damaging the paint layer of the crystal and affecting the gloss and appearance quality of the crystal. The present application adds a transition layer on the paint layer to enhance the bonding strength of the subsequent curing adhesive, improve the protection of the cured layer on the paint layer, and effectively enhance the gloss and appearance quality of the crystal.

[0096] According to Example 2, Comparative Example 2, and the data in Table 2, the curing adhesive in Comparative Example 2 uses UV adhesive, and the curing layer is cured by light, which results in the transition adhesive within the curing layer not being fully cured, thereby affecting the bonding strength between the paint layer and the transition layer. In contrast, the curing adhesive of the present application uses epoxy resin adhesive and combines it with thermal curing, ensuring that the transition adhesive and curing adhesive are fully cured, firmly bonding to the paint layer and preventing debonding, thereby effectively protecting the paint layer and the metal film layer.

[0097] According to Example 2 and Comparative Example 3 and the data in Table 2, the aluminum powder in Comparative Example 3 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 aluminum powder in the present application not only has better dispersibility, but also can further enhance the metallic luster of the crystal, further improving the aesthetic effect of the crystal product.

[0098] According to Example 2 and Comparative Example 4 and the data in Table 2, impurities on the crystal surface can cause the glue layer and paint layer to fall off. However, the surface of the crystal of the present application can effectively remove impurities after pretreatment, thereby improving the adhesion of the subsequent film layer.

[0099] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A roll coating process, characterized in that: The following steps are involved: S1: Surface treatment: pre-treat the crystal surface; S2: Coating treatment: Fix the surface-treated crystal and perform coating treatment on the table, crown facets and bottom surface of the crystal, so that a layer of metal film is attached to the outer surface of the crystal; S3: Painting: Use a roller to evenly apply paint to 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: After the paint layer on the bottom of the crystal is dry, evenly apply transition glue to the bottom of the crystal and perform light curing for 20-40 seconds to form a transition layer on the upper surface of the paint layer on the bottom of the crystal. Then evenly apply curing glue and heat it at 120-130℃ for 1-2 hours to form a cured layer on the upper surface of the transition layer. S5: Deplating treatment: pouring the crystal after the glue treatment in step S4 into the deplating solution for deplating treatment; S6: Cleaning: Rinse the crystal after stripping with clean water to obtain a crystal with a solidified layer attached to the bottom surface; 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; The preparation method of the transition glue includes the following steps: mixing polyurethane acrylate and N,N-dimethylacrylamide evenly, adding phenyl bis(2,4,6-trimethylbenzoyl)phosphine oxide and azobisisobutyronitrile, stirring at 40-50°C until the solid particles are completely dissolved, adding aluminum powder, stirring evenly to obtain the transition glue, and storing it in the dark.

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

3. A roll coating 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 solidified layer is 5000-10000 nm.

4. The roll coating 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.

5. The roll coating gluing process according to claim 1, characterized in that: The stripping solution in step S5 is alkaline water or nitric acid solution.

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

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