Two-color three-dimensional silicone logo production process

Abstract

The present invention relates to the field of silicone product processing technology, and specifically to a two-color three-dimensional silicone label production process, comprising the following steps: step (1): calendering a first color silicone label layer on a first release paper, then hollowing out the first color silicone label layer, with an edge roughness Ra of 0.3-0.6 μm, removing hollowed-out debris, coating with a silane coupling agent solution, and allowing to stand to obtain a first layer; step (2): filling and calendering a second color silicone filling layer in the hollowed-out area of ​​the first layer, and then vulcanizing at 145-155°C for 4-6 minutes to obtain a second layer; step (3): in a constant temperature and humidity environment, laminating a TPU hot melt adhesive film on the surface of the second layer, and applying a second release paper protective layer to obtain a two-color three-dimensional silicone label. This solution will provide components, and through multiple processes, collaboratively solve the aging and delamination problem of a multi-material composite system at the thermodynamic and kinetic levels; a two-color three-dimensional effect is obtained through multi-layer calendering and hollowing technology.

Description

Technical Field

[0001] The invention relates to the technical field of silicone product processing, and in particular to a production process for a two-color three-dimensional silicone logo. Background Art

[0002] With the widespread application of silicone products, two-color, three-dimensional silicone logos have attracted widespread attention in areas such as apparel accessories and industrial signage due to their unique visual effects and functionality. However, existing two-color silicone logo production processes still have certain shortcomings in terms of product three-dimensionality and interlayer bonding, which limits their further promotion and application.

[0003] CN114654644B discloses a process for producing multi-color, multi-specification silicone keypads and silicone keypads. This technology utilizes a single-key molding and secondary molding process to achieve multi-color silicone keypad production, effectively preventing color mixing and supporting up to 15 color combinations. However, this technical solution primarily focuses on the flat structural design of silicone keypads and fails to fully consider the specific requirements of three-dimensional logos. Specifically, this process fails to optimize the bonding strength between silicone layers, potentially leading to layer separation during long-term use. Furthermore, due to the lack of targeted surface treatment, the resulting silicone logos are susceptible to fading and aging due to environmental factors (such as ultraviolet light and high temperatures), impacting the product's lifespan and aesthetics. CN106335153B discloses a process for producing silicone pads. This technology utilizes a two-layer hot pressing process to produce a double-layer silicone pad, ensuring product flatness and smooth edges, making it suitable for applications requiring high durability. However, this technical solution primarily addresses the functional design of the silicone pads and does not address the production process for two-color or multi-color logos. Furthermore, this process has significant shortcomings in achieving a three-dimensional effect, making it difficult to meet the visual layering requirements of two-color three-dimensional silicone logos. At the same time, due to the lack of special treatment of the silicone surface (such as surfactant coating or debris cleaning), the product may have insufficient surface adhesion in actual application, which in turn affects the durability and appearance of the logo. Summary of the Invention

[0004] The purpose of the present invention is to provide a two-color three-dimensional silicone label production process. By sequentially processing a first-color silicone label layer and a second-color silicone filling layer on a first release paper, and combining a special surface treatment process with a constant temperature curing technology, the color stability, anti-aging performance and interlayer bonding strength of the product are significantly improved, while enhancing the visual layering, meeting the use requirements of high-end clothing accessories and industrial labels.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A two-color three-dimensional silicone label production process includes the following steps:

[0007] Step (1): rolling a first color silicone identification layer on a first release paper with a thickness of 0.6-1.0 mm and a rolling speed of 1.5-2.5 m / min; then hollowing out the first color silicone identification layer by laser or die cutting to form a hollow area with a pattern edge roughness Ra of 0.3-0.6 μm, using high-pressure air to blow away hollow debris, applying a silane coupling agent solution, and letting it stand to obtain a first layer;

[0008] Step (2): Fill and calender the second color silicone filling layer in the hollow area of ​​the first layer with a thickness of 0.4-0.7 mm, a pressure of 6-9 MPa, and a calendering speed of 1.5-2.5 m / min; then vulcanize at 145-155°C for 4-6 minutes to obtain the second layer;

[0009] Step (3): In a constant temperature and humidity environment, at a temperature of 20-25°C and a humidity of 35-45%, a TPU hot melt adhesive film is applied to the surface of the second layer, and a second release paper protective layer is applied to obtain a two-color three-dimensional silicone logo.

[0010] First Layer (Flat Calendering): The entire surface of the first release paper is calendered. The silicone flows in a continuous, uniform layer. Pressure has little influence on thickness control (thickness is primarily adjusted by roller spacing). Second Layer (Hollow Filling): Hollow areas must be precisely filled. Insufficient pressure can result in incomplete filling, bubbles, or missing adhesive. Excessive pressure can squeeze the first layer and cause deformation, so a limited pressure range is required.

[0011] Preferably, the first release paper is high temperature resistant glassine release paper; the second release paper is glassine release paper, CCK paper or SCK paper.

[0012] Preferably, the material formula of the first color silicone marking layer includes:

[0013] 100 parts by weight of methyl vinyl silicone rubber;

[0014] 1.5-2.5 parts of vulcanizing agent;

[0015] 6-12 parts of inorganic pigment;

[0016] 1-3 parts of anti-aging additives, which may include benzotriazole ultraviolet absorbers.

[0017] Preferably, the material formula of the second color silicone filling layer includes:

[0018] 100 parts by weight of methyl vinyl silicone rubber;

[0019] 1.0-1.5 parts of vulcanizing agent;

[0020] 5-8 parts of inorganic pigment;

[0021] 1-2 parts of tackifying resin.

[0022] Preferably, the edge of the hollow area is a serrated structure.

[0023] Preferably, before coating the silane coupling agent solution, the hollow surface is treated with argon plasma at a power of 40-60 W for 30-60 seconds.

[0024] After the first-color silicone layer is treated with argon plasma, the surface is etched and a high density of silanol groups (-SiOH) is generated, increasing the surface energy. This activated surface condenses with silanol groups generated by the hydrolysis of a silane coupling agent (γ-aminopropyltriethoxysilane). The water for hydrolysis originates from moisture in the air. This is due to the fact that the silane coupling agent solution, when exposed to air during coating, absorbs moisture from the air during stasis, leading to hydrolysis and the formation of a Si-O-Si covalent bond network. Simultaneously, the zigzag structure creates a mechanical interlocking effect during the calendering and filling of the second-color silicone. The second-color silicone, thickened with liquid silicone resin, penetrates the zigzag gaps under a pressure of 6-9 MPa and forms a "barbed" physical interlocking mechanism upon curing. The combined effects of chemical bonding and mechanical interlocking enhance interlayer peel strength and effectively suppress internal stress delamination caused by silicone aging and shrinkage.

[0025] Preferably, the first color silicone identification layer is pre-vulcanized at 145-150° C. for 80-100 seconds before hollowing out.

[0026] The process utilizes a staged vulcanization strategy: the first layer is partially cross-linked during pre-vulcanization, maintaining dimensional stability during subsequent hollowing operations. The final vulcanization of the second layer, after filling, forms an interpenetrating cross-linked network at the interface between the two silicone layers. The gradient design, with higher cross-linking density in the first layer and lower cross-linking density in the second layer, minimizes thermal shrinkage differences. The coating of the precious, high-temperature glassine release paper plays a key role in this process: its heat resistance of ≥200°C prevents silicone migration and contamination during high-temperature vulcanization; its exceptional flatness of 0.02mm ensures uniform calendering thickness; and its precise peel force of 0.8-1.5N / cm prevents damage to the weak interface between the silicone layers during peeling.

[0027] Preferably, the silane coupling agent solution is a γ-aminopropyltriethoxysilane ethanol solution with a mass fraction of 1-3%.

[0028] Preferably, the TPU hot melt adhesive film is preheated to 75-85° C. before lamination, and the lamination pressure is 0.4-0.6 MPa.

[0029] Preferably, the basis weight of the glassine release paper is 60-80 g / m 2 , silicone oil coating amount 0.8-1.2g / m 2 .

[0030] In summary, the present invention successfully solves the problems of fading, aging, lack of three-dimensional effect and easy separation between layers in the prior art through a unique two-color silicone layer processing technology, sophisticated surface treatment technology and strict process parameter control, and has significant technological progress and market application value.

[0031] The present invention has the following advantages:

[0032] 1. This solution integrates surface energy regulation (plasma activation), interfacial chemical grafting (silane coupling), physical anchoring (serrated structure), and macroscopic stress balance (gradient vulcanization / release paper support), synergistically solving the aging and delamination problem of multi-material composite systems at the thermodynamic and kinetic levels.

[0033] 2. Through multi-layer calendering and hollowing technology, a two-color three-dimensional effect is achieved. DETAILED DESCRIPTION

[0034] The following describes the implementation of the present invention using specific embodiments. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. Obviously, the embodiments described are only a portion of the present invention, not all of it. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are intended to fall within the scope of protection of the present invention.

[0035] Overall embodiment

[0036] A two-color three-dimensional silicone label production process includes the following steps:

[0037] Step (1): At a basis weight of 60-80g / m 2 , Silicone oil coating amount 0.8-1.2g / m 2The first color silicone identification layer (material formula: 100 parts by weight of methyl vinyl silicone rubber, 2 parts of sulfur powder, 10 parts of iron red powder, 1 part of 2-(2H-benzotriazole-2-yl)-4,6-di-tert-amylphenol and 1 part of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate)) is calendered on the high-temperature resistant glassine release paper (temperature resistance 210℃, surface flatness 0.01mm, peel force 1.3N / cm). The thickness is controlled to be 0.6-1.0mm and the calendering speed is 1.5-2.5m / s. min; then pre-vulcanize at 145-150°C for 80-100 seconds; after vulcanization, laser hollowing is performed to form a hollow area with a serrated edge structure and a roughness Ra of 0.3-0.6μm; after using high-pressure air to blow away debris, the hollowed surface is treated with argon plasma (power 40-60W, time 30-60s), and then coated with a 1-3% mass fraction of γ-aminopropyltriethoxysilane ethanol solution. The solution is then allowed to stand at 25°C and 60% humidity for 30 minutes to obtain the first pre-treated layer;

[0038] Step (2): Fill and calender a second color silicone filling layer (material formula: 100 parts by weight of methyl vinyl silicone rubber, 1.0-1.5 parts of sulfur powder, 5-8 parts of titanium dioxide, and 1-2 parts of tackifying resin) in the hollowed area of ​​the first layer obtained in step (1), controlling the filling thickness to 0.4-0.7 mm, the calendering pressure to 6-9 MPa, and the calendering speed to 1.5-2.5 m / min; then vulcanize the entire structure at 145-155° C. for 4-6 minutes to complete the cross-linking and compounding of the two-color silicone layer to obtain the second layer;

[0039] Step (3): In a constant temperature and humidity environment, at a temperature of 20-25°C and a humidity of 35-45%, preheat the TPU hot melt adhesive film to 80°C, and then cover it on the second layer surface of step (2) with a bonding pressure of 0.5 MPa, and at the same time apply an SCK paper protective layer, finally obtaining a two-color three-dimensional silicone logo. Example 1

[0040] A two-color three-dimensional silicone label production process includes the following steps:

[0041] Step (1): At a basis weight of 70g / m 2 , Silicone oil coating amount 1.0g / m 2A first color silicone label layer was calendered onto a high-temperature resistant glassine release paper with a controlled thickness of 0.8 mm and a calendering speed of 2.0 m / min. The paper was then pre-vulcanized at 148°C for 90 seconds. After vulcanization, laser hollowing was performed to form a hollowed area with a serrated edge structure and a roughness Ra of 0.5 μm. After high-pressure air was used to remove debris, the hollowed surface was treated with argon plasma at a power of 50 W for 45 seconds. The paper was then coated with a 2% by mass solution of γ-aminopropyltriethoxysilane in ethanol and allowed to stand at 25°C and 60% humidity for 30 minutes to obtain the pre-treated first layer.

[0042] Step (2): Fill and calender a second color silicone filling layer in the hollowed area of ​​the first layer obtained in step (1), wherein the material formula is: 100 parts by weight of methyl vinyl silicone rubber, 1.3 parts of sulfur powder, 7 parts of titanium dioxide, and 1.5 parts of tackifying resin; control the filling thickness to be 0.6 mm, the calendering pressure to be 8 MPa, and the calendering speed to be 2.0 m / min; then vulcanize the entire structure at 150° C. for 5 minutes to complete the cross-linking and compounding of the two-color silicone layer to obtain the second layer;

[0043] Step (3): In a constant temperature and humidity environment, at a temperature of 23°C and a humidity of 40%, the TPU hot melt adhesive film is preheated at 80°C and then covered on the second layer surface of step (2) with a bonding pressure of 0.5 MPa. At the same time, an SCK paper protective layer is applied to finally obtain a two-color three-dimensional silicone logo. Example 2

[0044] A two-color three-dimensional silicone label production process includes the following steps:

[0045] Step (1): At a basis weight of 80g / m 2 , Silicone oil coating amount 1.2g / m 2 A first color silicone label layer was calendered onto a high-temperature resistant glassine release paper with a controlled thickness of 1.0 mm and a calendering speed of 2.5 m / min. The paper was then pre-vulcanized at 150°C for 100 seconds. After vulcanization, laser hollowing was performed to form a hollowed area with a serrated edge structure and a roughness Ra of 0.3 μm. After high-pressure air was used to remove debris, the hollowed surface was treated with argon plasma at 45 W for 40 seconds. The surface was then coated with a 1.5% mass fraction of γ-aminopropyltriethoxysilane ethanol solution and allowed to stand at 25°C and 60% humidity for 30 minutes to obtain the pre-treated first layer.

[0046] Step (2): Fill and calender the second color silicone filling layer in the hollow area of ​​the first layer obtained in step (1), the material formula is: 100 parts by weight of methyl vinyl silicone rubber, 1.5 parts of sulfur powder, 8 parts of titanium dioxide, 2 parts of tackifying resin, and control the filling thickness to be 0.7 mm, the calendering pressure to be 9 MPa, and the calendering speed to be 1.5 m / min; then vulcanize the entire structure at 155° C. for 6 minutes to complete the cross-linking and compounding of the two-color silicone layer to obtain the second layer;

[0047] Step (3): In a constant temperature and humidity environment, at a temperature of 23°C and a humidity of 40%, the TPU hot melt adhesive film is preheated at 80°C and then covered on the second layer surface of step (2) with a bonding pressure of 0.5 MPa. At the same time, an SCK paper protective layer is applied to finally obtain a two-color three-dimensional silicone logo.

[0048] Comparative Example 1

[0049] The difference from Example 1 is that the first color silicone marking layer is not pre-cured:

[0050] A two-color three-dimensional silicone label production process includes the following steps:

[0051] Step (1): At a basis weight of 70g / m 2 , Silicone oil coating amount 1.0g / m 2 A first color silicone label layer was calendered onto high-temperature resistant glassine release paper with a controlled thickness of 0.8 mm and a calendering speed of 2.0 m / min. Laser hollowing was then performed to form a hollowed area with a serrated edge structure and a roughness Ra of 0.5 μm. After high-pressure air was used to remove debris, the hollowed surface was treated with argon plasma at a power of 50 W for 45 seconds. A 2% by mass solution of γ-aminopropyltriethoxysilane in ethanol was then coated and allowed to stand at 25°C and 60% humidity for 30 minutes to obtain the pretreated first layer.

[0052] Step (2): Fill and calender a second color silicone filling layer in the hollowed area of ​​the first layer obtained in step (1), wherein the material formula is: 100 parts by weight of methyl vinyl silicone rubber, 1.3 parts of sulfur powder, 7 parts of titanium dioxide, and 1.5 parts of tackifying resin; control the filling thickness to be 0.6 mm, the calendering pressure to be 8 MPa, and the calendering speed to be 2.0 m / min; then vulcanize the entire structure at 150° C. for 5 minutes to complete the cross-linking and compounding of the two-color silicone layer to obtain the second layer;

[0053] Step (3): In a constant temperature and humidity environment, at a temperature of 23°C and a humidity of 40%, the TPU hot melt adhesive film is preheated at 80°C and then covered on the second layer surface of step (2) with a bonding pressure of 0.5 MPa. At the same time, an SCK paper protective layer is applied to finally obtain a two-color three-dimensional silicone logo.

[0054] Comparative Example 2

[0055] The difference from Example 1 is that the roughness Ra of the hollowed-out part is 0.2 μm:

[0056] A two-color three-dimensional silicone label production process includes the following steps:

[0057] Step (1): At a basis weight of 70g / m 2 , Silicone oil coating amount 1.0g / m 2 A first color silicone label layer was calendered onto a high-temperature resistant glassine release paper with a controlled thickness of 0.8 mm and a calendering speed of 2.0 m / min. The paper was then pre-vulcanized at 148°C for 90 seconds. After vulcanization, laser hollowing was performed to form a hollowed area with a serrated edge structure and a roughness Ra of 0.2 μm. After high-pressure air was used to remove debris, the hollowed surface was treated with argon plasma at a power of 50 W for 45 seconds. The paper was then coated with a 2% by mass solution of γ-aminopropyltriethoxysilane in ethanol and allowed to stand at 25°C and 60% humidity for 30 minutes to obtain the pre-treated first layer.

[0058] Step (2): Fill and calender a second color silicone filling layer in the hollowed area of ​​the first layer obtained in step (1), wherein the material formula is: 100 parts by weight of methyl vinyl silicone rubber, 1.3 parts of sulfur powder, 7 parts of titanium dioxide, and 1.5 parts of tackifying resin; control the filling thickness to be 0.6 mm, the calendering pressure to be 8 MPa, and the calendering speed to be 2.0 m / min; then vulcanize the entire structure at 150° C. for 5 minutes to complete the cross-linking and compounding of the two-color silicone layer to obtain the second layer;

[0059] Step (3): In a constant temperature and humidity environment, at a temperature of 23°C and a humidity of 40%, the TPU hot melt adhesive film is preheated at 80°C and then covered on the second layer surface of step (2) with a bonding pressure of 0.5 MPa. At the same time, an SCK paper protective layer is applied to finally obtain a two-color three-dimensional silicone logo.

[0060] Comparative Example 3

[0061] The difference from Example 1 is that the roughness Ra of the hollowed-out part is 0.8 μm:

[0062] A two-color three-dimensional silicone label production process includes the following steps:

[0063] Step (1): At a basis weight of 70g / m 2 , Silicone oil coating amount 1.0g / m 2A first color silicone label layer was calendered onto a high-temperature resistant glassine release paper with a controlled thickness of 0.8 mm and a calendering speed of 2.0 m / min. The paper was then pre-vulcanized at 148°C for 90 seconds. After vulcanization, laser hollowing was performed to form a hollowed area with a serrated edge structure and a roughness Ra of 0.8 μm. Debris was removed by high-pressure air blowing, and the hollowed surface was treated with argon plasma at a power of 50 W for 45 seconds. The paper was then coated with a 2% by mass solution of γ-aminopropyltriethoxysilane in ethanol and allowed to stand at 25°C and 60% humidity for 30 minutes to obtain the pre-treated first layer.

[0064] Step (2): Fill and calender a second color silicone filling layer in the hollowed area of ​​the first layer obtained in step (1), wherein the material formula is: 100 parts by weight of methyl vinyl silicone rubber, 1.3 parts of sulfur powder, 7 parts of titanium dioxide, and 1.5 parts of tackifying resin; control the filling thickness to be 0.6 mm, the calendering pressure to be 8 MPa, and the calendering speed to be 2.0 m / min; then vulcanize the entire structure at 150° C. for 5 minutes to complete the cross-linking and compounding of the two-color silicone layer to obtain the second layer;

[0065] Step (3): In a constant temperature and humidity environment, at a temperature of 23°C and a humidity of 40%, the TPU hot melt adhesive film is preheated at 80°C and then covered on the second layer surface of step (2) with a bonding pressure of 0.5 MPa. At the same time, an SCK paper protective layer is applied to finally obtain a two-color three-dimensional silicone logo.

[0066] Comparative Example 4

[0067] The difference from Example 1 is that the hollowed-out areas are not plasma treated:

[0068] A two-color three-dimensional silicone label production process includes the following steps:

[0069] Step (1): At a basis weight of 70g / m 2 , Silicone oil coating amount 1.0g / m 2 A first color silicone logo layer was calendered onto a high-temperature resistant glassine release paper with a controlled thickness of 0.8 mm and a calendering speed of 2.0 m / min. The paper was then pre-vulcanized at 148°C for 90 seconds. After vulcanization, laser hollowing was performed to form a hollowed area with a serrated edge structure and a roughness Ra of 0.5 μm. After removing debris with high-pressure air blowing, a 2% (mass fraction) ethanol solution of γ-aminopropyltriethoxysilane was applied and the paper was allowed to stand at 25°C and 60% humidity for 30 minutes to obtain the pre-treated first layer.

[0070] Step (2): Fill and calender a second color silicone filling layer in the hollowed area of ​​the first layer obtained in step (1), wherein the material formula is: 100 parts by weight of methyl vinyl silicone rubber, 1.3 parts of sulfur powder, 7 parts of titanium dioxide, and 1.5 parts of tackifying resin; control the filling thickness to be 0.6 mm, the calendering pressure to be 8 MPa, and the calendering speed to be 2.0 m / min; then vulcanize the entire structure at 150° C. for 5 minutes to complete the cross-linking and compounding of the two-color silicone layer to obtain the second layer;

[0071] Step (3): In a constant temperature and humidity environment, at a temperature of 23°C and a humidity of 40%, the TPU hot melt adhesive film is preheated at 80°C and then covered on the second layer surface of step (2) with a bonding pressure of 0.5 MPa. At the same time, an SCK paper protective layer is applied to finally obtain a two-color three-dimensional silicone logo.

[0072] Comparative Example 5

[0073] The difference from Example 1 is that the plasma treatment parameters at the hollowed-out areas are too large:

[0074] A two-color three-dimensional silicone label production process includes the following steps:

[0075] Step (1): At a basis weight of 70g / m 2 , Silicone oil coating amount 1.0g / m 2 A first color silicone label layer was calendered onto a high-temperature resistant glassine release paper with a controlled thickness of 0.8 mm and a calendering speed of 2.0 m / min. The paper was then pre-vulcanized at 148°C for 90 seconds. After vulcanization, laser hollowing was performed to form a hollowed area with a serrated edge structure and a roughness Ra of 0.5 μm. Debris was removed by high-pressure air blowing, and the hollowed surface was treated with argon plasma at a power of 120 W for 90 seconds. The paper was then coated with a 2% by mass solution of γ-aminopropyltriethoxysilane in ethanol and allowed to stand at 25°C and 60% humidity for 30 minutes to obtain the pre-treated first layer.

[0076] Step (2): Fill and calender a second color silicone filling layer in the hollowed area of ​​the first layer obtained in step (1), wherein the material formula is: 100 parts by weight of methyl vinyl silicone rubber, 1.3 parts of sulfur powder, 7 parts of titanium dioxide, and 1.5 parts of tackifying resin; control the filling thickness to be 0.6 mm, the calendering pressure to be 8 MPa, and the calendering speed to be 2.0 m / min; then vulcanize the entire structure at 150° C. for 5 minutes to complete the cross-linking and compounding of the two-color silicone layer to obtain the second layer;

[0077] Step (3): In a constant temperature and humidity environment, at a temperature of 23°C and a humidity of 40%, the TPU hot melt adhesive film is preheated at 80°C and then covered on the second layer surface of step (2) with a bonding pressure of 0.5 MPa. At the same time, an SCK paper protective layer is applied to finally obtain a two-color three-dimensional silicone logo.

[0078] Comparative Example 6

[0079] The difference from Example 1 is that the hollowed-out areas are not coated with silane coupling agent:

[0080] A two-color three-dimensional silicone label production process includes the following steps:

[0081] Step (1): At a basis weight of 70g / m 2 , Silicone oil coating amount 1.0g / m 2 A first color silicone logo layer was calendered onto a high-temperature resistant glassine release paper with a controlled thickness of 0.8 mm and a calendering speed of 2.0 m / min. The paper was then pre-vulcanized at 148°C for 90 seconds. After vulcanization, laser hollowing was performed to form a hollowed area with a serrated edge structure and a roughness Ra of 0.5 μm. After high-pressure air was used to remove debris, the hollowed surface was treated with argon plasma at a power of 50 W for 45 seconds and allowed to stand for 30 minutes at a temperature of 25°C and a humidity of 60%, thereby obtaining the pre-treated first layer.

[0082] Step (2): Fill and calender a second color silicone filling layer in the hollowed area of ​​the first layer obtained in step (1), wherein the material formula is: 100 parts by weight of methyl vinyl silicone rubber, 1.3 parts of sulfur powder, 7 parts of titanium dioxide, and 1.5 parts of tackifying resin; control the filling thickness to be 0.6 mm, the calendering pressure to be 8 MPa, and the calendering speed to be 2.0 m / min; then vulcanize the entire structure at 150° C. for 5 minutes to complete the cross-linking and compounding of the two-color silicone layer to obtain the second layer;

[0083] Step (3): In a constant temperature and humidity environment, at a temperature of 23°C and a humidity of 40%, the TPU hot melt adhesive film is preheated at 80°C and then covered on the second layer surface of step (2) with a bonding pressure of 0.5 MPa. At the same time, an SCK paper protective layer is applied to finally obtain a two-color three-dimensional silicone logo.

[0084] Comparative Example 7

[0085] The difference from Example 1 is that the material formula of the second color silica gel filling layer is different:

[0086] A two-color three-dimensional silicone label production process includes the following steps:

[0087] Step (1): At a basis weight of 70g / m 2 , Silicone oil coating amount 1.0g / m 2A first color silicone label layer was calendered onto a high-temperature resistant glassine release paper with a controlled thickness of 0.8 mm and a calendering speed of 2.0 m / min. The paper was then pre-vulcanized at 148°C for 90 seconds. After vulcanization, laser hollowing was performed to form a hollowed area with a serrated edge structure and a roughness Ra of 0.5 μm. After high-pressure air was used to remove debris, the hollowed surface was treated with argon plasma at a power of 50 W for 45 seconds. The paper was then coated with a 2% by mass solution of γ-aminopropyltriethoxysilane in ethanol and allowed to stand at 25°C and 60% humidity for 30 minutes to obtain the pre-treated first layer.

[0088] Step (2): Fill and calender a second color silicone filling layer in the hollow area of ​​the first layer obtained in step (1), wherein the material formula is: 100 parts by weight of methyl vinyl silicone rubber, 2 parts of sulfur powder, 7 parts of titanium dioxide, and 1.5 parts of tackifying resin; control the filling thickness to 0.6 mm, the calendering pressure to 8 MPa, and the calendering speed to 2.0 m / min; then vulcanize the entire structure at 150° C. for 5 minutes to complete the cross-linking and compounding of the two-color silicone layer to obtain the second layer;

[0089] Step (3): In a constant temperature and humidity environment, at a temperature of 23°C and a humidity of 40%, the TPU hot melt adhesive film is preheated at 80°C and then covered on the second layer surface of step (2) with a bonding pressure of 0.5 MPa. At the same time, an SCK paper protective layer is applied to finally obtain a two-color three-dimensional silicone logo.

[0090] Comparative Example 8

[0091] The difference from Example 1 is that the material formula of the second color silica gel filling layer is different:

[0092] A two-color three-dimensional silicone label production process includes the following steps:

[0093] Step (1): At a basis weight of 70g / m 2 , Silicone oil coating amount 1.0g / m 2 A first color silicone label layer was calendered onto a high-temperature resistant glassine release paper with a controlled thickness of 0.8 mm and a calendering speed of 2.0 m / min. The paper was then pre-vulcanized at 148°C for 90 seconds. After vulcanization, laser hollowing was performed to form a hollowed area with a serrated edge structure and a roughness Ra of 0.5 μm. After high-pressure air was used to remove debris, the hollowed surface was treated with argon plasma at a power of 50 W for 45 seconds. The paper was then coated with a 2% by mass solution of γ-aminopropyltriethoxysilane in ethanol and allowed to stand at 25°C and 60% humidity for 30 minutes to obtain the pre-treated first layer.

[0094] Step (2): Fill and calender the second color silicone filling layer in the hollow area of ​​the first layer obtained in step (1), the material formula being: 100 parts by weight of methyl vinyl silicone rubber, 7 parts of titanium dioxide, and 1.5 parts of tackifying resin; controlling the filling thickness to be 0.6 mm, the calendering pressure to be 8 MPa, and the calendering speed to be 2.0 m / min; then vulcanizing the entire structure at 150° C. for 5 minutes to complete the cross-linking and compounding of the two-color silicone layer, thereby obtaining the second layer;

[0095] Step (3): In a constant temperature and humidity environment, at a temperature of 23°C and a humidity of 40%, the TPU hot melt adhesive film is preheated at 80°C and then covered on the second layer surface of step (2) with a bonding pressure of 0.5 MPa. At the same time, an SCK paper protective layer is applied to finally obtain a two-color three-dimensional silicone logo.

[0096] Comparative Example 9

[0097] The difference from Example 1 is that the calendering parameters in step (2) are different:

[0098] A two-color three-dimensional silicone label production process includes the following steps:

[0099] Step (1): At a basis weight of 70g / m 2 , Silicone oil coating amount 1.0g / m 2 A first color silicone label layer was calendered onto a high-temperature resistant glassine release paper with a controlled thickness of 0.8 mm and a calendering speed of 2.0 m / min. The paper was then pre-vulcanized at 148°C for 90 seconds. After vulcanization, laser hollowing was performed to form a hollowed area with a serrated edge structure and a roughness Ra of 0.5 μm. After high-pressure air was used to remove debris, the hollowed surface was treated with argon plasma at a power of 50 W for 45 seconds. The paper was then coated with a 2% by mass solution of γ-aminopropyltriethoxysilane in ethanol and allowed to stand at 25°C and 60% humidity for 30 minutes to obtain the pre-treated first layer.

[0100] Step (2): Fill and calender a second color silicone filling layer in the hollowed area of ​​the first layer obtained in step (1), wherein the material formula is: 100 parts by weight of methyl vinyl silicone rubber, 1.3 parts of sulfur powder, 7 parts of titanium dioxide, and 1.5 parts of tackifying resin; control the filling thickness to be 0.6 mm, the calendering pressure to be 15 MPa, and the calendering speed to be 1.0 m / min; then vulcanize the entire structure at 150° C. for 5 minutes to complete the cross-linking and compounding of the two-color silicone layer, thereby obtaining the second layer;

[0101] Step (3): In a constant temperature and humidity environment, at a temperature of 23°C and a humidity of 40%, the TPU hot melt adhesive film is preheated at 80°C and then covered on the second layer surface of step (2) with a bonding pressure of 0.5 MPa. At the same time, an SCK paper protective layer is applied to finally obtain a two-color three-dimensional silicone logo.

[0102] Comparative Example 10

[0103] The difference from Example 1 is that in step (3), the constant temperature and humidity conditions are different:

[0104] A two-color three-dimensional silicone label production process includes the following steps:

[0105] Step (1): At a basis weight of 70g / m 2 , Silicone oil coating amount 1.0g / m 2 A first color silicone label layer was calendered onto a high-temperature resistant glassine release paper with a controlled thickness of 0.8 mm and a calendering speed of 2.0 m / min. The paper was then pre-vulcanized at 148°C for 90 seconds. After vulcanization, laser hollowing was performed to form a hollowed area with a serrated edge structure and a roughness Ra of 0.5 μm. After high-pressure air was used to remove debris, the hollowed surface was treated with argon plasma at a power of 50 W for 45 seconds. The paper was then coated with a 2% by mass solution of γ-aminopropyltriethoxysilane in ethanol and allowed to stand at 25°C and 60% humidity for 30 minutes to obtain the pre-treated first layer.

[0106] Step (2): Fill and calender a second color silicone filling layer in the hollowed area of ​​the first layer obtained in step (1), wherein the material formula is: 100 parts by weight of methyl vinyl silicone rubber, 1.3 parts of sulfur powder, 7 parts of titanium dioxide, and 1.5 parts of tackifying resin; control the filling thickness to be 0.6 mm, the calendering pressure to be 8 MPa, and the calendering speed to be 2.0 m / min; then vulcanize the entire structure at 150° C. for 5 minutes to complete the cross-linking and compounding of the two-color silicone layer to obtain the second layer;

[0107] Step (3): In a constant temperature and humidity environment, at a temperature of 30°C and a humidity of 50%, preheat the TPU hot melt adhesive film at 80°C, and then cover it on the second layer surface of step (2) with a bonding pressure of 0.5 MPa, and at the same time apply an SCK paper protective layer, finally obtaining a two-color three-dimensional silicone logo.

[0108] Comparative Example 11

[0109] The difference from Example 1 is that no static treatment is performed after applying the silane coupling agent:

[0110] A two-color three-dimensional silicone label production process includes the following steps:

[0111] Step (1): At a basis weight of 70g / m 2 , Silicone oil coating amount 1.0g / m 2A first color silicone label layer was calendered onto a high-temperature resistant glassine release paper with a controlled thickness of 0.8 mm and a calendering speed of 2.0 m / min. The paper was then pre-vulcanized at 148°C for 90 seconds. After vulcanization, laser hollowing was performed to form a hollowed area with a serrated edge structure and a roughness Ra of 0.5 μm. After high-pressure air was used to remove debris, the hollowed surface was treated with argon plasma at a power of 50 W for 45 seconds, and then coated with a 2% by mass solution of γ-aminopropyltriethoxysilane in ethanol to obtain the pre-treated first layer.

[0112] Step (2): Fill and calender a second color silicone filling layer in the hollowed area of ​​the first layer obtained in step (1), wherein the material formula is: 100 parts by weight of methyl vinyl silicone rubber, 1.3 parts of sulfur powder, 7 parts of titanium dioxide, and 1.5 parts of tackifying resin; control the filling thickness to be 0.6 mm, the calendering pressure to be 8 MPa, and the calendering speed to be 2.0 m / min; then vulcanize the entire structure at 150° C. for 5 minutes to complete the cross-linking and compounding of the two-color silicone layer to obtain the second layer;

[0113] Step (3): In a constant temperature and humidity environment, at a temperature of 23°C and a humidity of 40%, the TPU hot melt adhesive film is preheated at 80°C and then covered on the second layer surface of step (2) with a bonding pressure of 0.5 MPa. At the same time, an SCK paper protective layer is applied to finally obtain a two-color three-dimensional silicone logo.

[0114] The effect test is shown in Table 1.

[0115] Table 1:

[0116]

[0117] Compared with Example 1, the first color silicone identification layer of Comparative Example 1 is not pre-vulcanized and lacks pre-crosslinking. Uncontrollable flow deformation occurs during the calendering of the filling layer, resulting in complete collapse of the structure. At the same time, the uncured interface relies only on weak physical adsorption, and the subsequent vulcanization process triggers the migration of the iron red pigment.

[0118] Compared with Example 1, the surface of the hollow part of Comparative Example 2 is too smooth, the mechanical interlocking area is reduced by 65%, the interface bonding strength is significantly weakened, and the interface slip is aggravated during thermal cycling.

[0119] Compared with Example 1, the hollowed-out portion of Comparative Example 3 is too rough, resulting in stress concentration and causing local debonding.

[0120] In Comparative Example 4, compared with Example 1, the hollowed-out portion was not treated with plasma, the activity of the silica gel in the hollowed-out portion was low, the silane could not bond effectively, the lack of chemical bonds caused the interface peeling force to plummet, and the thermal expansion mismatch could not be compensated.

[0121] Compared with Example 1, in Comparative Example 5, the hollowed-out portion was excessively plasma-treated, and the local high temperature may have caused surface carbonization, forming a weak boundary layer.

[0122] Compared with Example 1, in Comparative Example 6, the hollowed-out portion is not treated with a silane coupling agent and relies solely on van der Waals forces, resulting in a sharp decrease in peeling force and a high thermal cycle delamination rate.

[0123] In Comparative Example 7, compared with Example 1, the second color glue filling layer contains excessive sulfur, which leads to concentration of curing shrinkage stress and causes micro cracks. The excessive sulfur also oxidizes the titanium dioxide and causes yellowing.

[0124] In Comparative Example 8, compared with Example 1, the second color glue filling layer does not contain sulfur, resulting in non-crosslinking, a large difference in thermal expansion coefficients, interface tearing under thermal stress, and loss of strength of the non-crosslinked structure.

[0125] In Comparative Example 9, compared with Example 1, step (2) is subjected to high-pressure rolling, which leads to internal stress concentration, weakens the interlayer bonding, and induces the expansion of the interface gap.

[0126] Compared with Example 1, the humidity in Comparative Example 10 is too high, which results in the obstruction of molecular diffusion during TPU lamination, and the risk of delamination is still significant in a hot and humid environment.

[0127] Compared with Example 1, in Comparative Example 11, the silane coupling agent was not subjected to a standing treatment after coating, resulting in the coupling agent not being completely hydrolyzed, causing a sharp decrease in the peeling force and a high thermal cycle delamination rate.

[0128] In summary, the embodiment achieves "mechanical-chemical" dual locking of the interface through pre-vulcanization structure shaping, plasma precision activation, silane chemical bonding and sulfur gradient control, with high peel force, and comprehensive leading thermal expansion matching and color stability.

Claims

1. A two-color three-dimensional silicone label production process, characterized in that: The following steps are involved: Step (1): rolling a first color silicone identification layer on a first release paper, then hollowing out the first color silicone identification layer, with an edge roughness Ra of 0.3-0.6 μm, removing hollowed debris, coating with a silane coupling agent solution, and allowing to stand to obtain a first layer; Before coating the silane coupling agent solution, the hollow surface is treated with argon plasma at a power of 40-60W for 30-60s. Step (2): Filling the hollow area of ​​the first layer with a second color silicone filling layer by calendering, wherein the edge of the hollow area is a serrated structure, and then vulcanizing at 145-155°C for 4-6 minutes to obtain the second layer; Step (3): In a constant temperature and humidity environment, at a temperature of 20-25°C and a humidity of 35-45%, a TPU hot melt adhesive film is applied to the surface of the second layer, and a second release paper protective layer is applied to obtain a two-color three-dimensional silicone logo.

2. The process for producing a two-color three-dimensional silicone label according to claim 1, wherein: The first color silicone logo layer is calendered on the first release paper at a calendering speed of 1.5-2.5 m / min.

3. The process for producing a two-color three-dimensional silicone label according to claim 1, wherein: The hollow area of ​​the first layer is filled with a second color silicone filling layer by calendering at a pressure of 6-9 MPa and a calendering speed of 1.5-2.5 m / min.

4. The process for producing a two-color three-dimensional silicone label according to claim 1, wherein: The first release paper has a basis weight of 60-80g / m 2 , silicone oil coating amount 0.8-1.2g / m 2 The second release paper is one of glassine release paper, CCK paper and SCK paper.

5. The process for producing a two-color three-dimensional silicone label according to claim 1, wherein: The material formula of the first color silicone marking layer includes: 100 parts by weight of methyl vinyl silicone rubber; 1.5-2.5 parts by weight of vulcanizing agent; 6-12 parts by weight of inorganic pigment; 1-3 parts by weight of anti-aging additives.

6. The process for producing a two-color three-dimensional silicone label according to claim 1, wherein: The material formula of the second color silicone filling layer includes: 100 parts by weight of methyl vinyl silicone rubber; 1.0-1.5 parts by weight of vulcanizing agent; 5-8 parts by weight of inorganic pigment; 1-2 parts by weight of tackifying resin.

7. The process for producing a two-color three-dimensional silicone label according to claim 1, characterized in that The TPU hot melt adhesive film is preheated to 75-85° C. before lamination, and the lamination pressure is 0.4-0.6 MPa.

8. The process for producing a two-color three-dimensional silicone label according to claim 1, wherein: The first color silicone identification layer is pre-vulcanized at 145-150°C for 80-100s before hollowing out.

9. The process for producing a two-color three-dimensional silicone label according to claim 1, wherein: The silane coupling agent solution is a γ-aminopropyltriethoxysilane ethanol solution with a mass fraction of 1-3%.

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