Preparation process of gold foil adhesive

Abstract

The application discloses a preparation process of gold foil glue, which is configured by raw materials in a mass ratio of 717 glue:diluent:auxiliary agent=0.8-1.2:0.8-1.2:0.3-0.7. The application provides a preparation process of gold foil glue which is fast in drying and not easily affected by air temperature in gold sticking effect.

Description

Technical Field

[0001] This invention relates to the field of gold foil adhesive technology, and more particularly to a preparation process for gold foil adhesive. Background Technology

[0002] Gold foil adhesive is a special adhesive used to bond metal foils such as gold foil, silver foil, and copper foil. It is divided into two main types: water-based and oil-based, suitable for different construction scenarios.

[0003] Problems and drawbacks of existing technologies: 1. Excessive drying time for gold leaf adhesive: It takes more than three hours for the gold leaf adhesive to dry. This is because the gold leaf adhesive formula or drying process has limitations, resulting in slow curing speed, which significantly prolongs the gilding process and reduces production efficiency. 2. The gilding effect is greatly affected by temperature, easily leading to bubbling and matte finish: This is because temperature changes interfere with the drying rate and curing state of the gold leaf adhesive. When the temperature is unstable, the gold leaf adhesive dries unevenly, resulting in poor adhesion between the gold leaf and the substrate, which in turn causes bubbling. At the same time, temperature fluctuations affect the maintenance of the gold leaf surface gloss, causing the gold leaf to lose its bright texture and become matte, seriously affecting the appearance quality of the finished product. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a preparation process for gold foil adhesive that dries quickly and whose gold-plating effect is not easily affected by temperature.

[0005] To achieve the above objectives, the technical solution of the present invention is: a preparation process for gold foil adhesive, comprising raw materials configured in the following mass ratio: 717 glue: thinner: auxiliary agent = 0.8~1.2: 0.8~1.2: 0.3~0.7.

[0006] With the above structure, this invention has the following advantages compared with the prior art: 717 glue and diluent are mixed together to form a colloidal solution, which adjusts the viscosity of the glue and reduces its thickness to facilitate application. At the same time, it optimizes the leveling properties of the glue, making the glue layer more evenly distributed. The auxiliary agent can help adjust the drying rate of the glue, avoiding the impact of an unsuitable drying rhythm on the construction. It can enhance the flexibility of the glue layer and reduce the risk of cracking later. It can also improve the wettability of the glue to the substrate, helping the gold foil to adhere more smoothly and reducing defects such as bubbles. The colloidal solution and auxiliary agent are mixed together to form a homogeneous composite water-based adhesive colloid. The three work together to solve the core pain points of traditional gold glue drying slowly and the gold plating effect being affected by temperature.

[0007] Preferably, the 717 adhesive is one or a combination of more than one of HR-717 grafted neoprene adhesive, 717 single-component polyurethane adhesive, and 717 adhesive for PVC / UPVC pipes.

[0008] Preferably, the diluent is one or a combination of two of water and ethanol.

[0009] Preferably, the auxiliary agent is one or a combination of two of turpentine and gasoline.

[0010] Preferably, it includes the following steps: S1. Initial fusion: Put the 717 glue and thinner into a container and stir for 50-70 seconds to form a colloidal solution, dilute the colloidal molecules, and reduce the viscosity of the colloidal solution. S2. Secondary fusion: Slowly add the auxiliary agent and continue stirring at a constant speed for 2-3 minutes to evenly disperse it in the colloidal solution, adjust the drying rate, toughen it, and improve its wettability; S3. Preparation complete: Stop stirring when the adhesive solution is clear and uniform, without layering, clumping, or flocculent sedimentation, forming a homogeneous composite water-based adhesive colloid. S4. Defoaming: Let stand for 25-35 seconds before applying the coating.

[0011] Preferably, in steps S1, S2, S3, and S4, the temperature is controlled between 20°C and 28°C, and the ambient humidity is controlled between 40% and 70%.

[0012] Preferably, the stirring speed in steps S1, S2, and S3 is ≤300 r / min.

[0013] Preferably, the stirring in steps S1, S2, and S3 is carried out in a closed container.

[0014] Preferably, the total stirring time in steps S1, S2, and S3 is controlled to be 3 to 4 minutes. Detailed Implementation

[0015] The present invention will be further described below with reference to specific embodiments.

[0016] This invention provides a preparation process for gold foil adhesive, which is prepared from raw materials in the following mass ratio: 717 adhesive: thinner: auxiliary agent = 0.8~1.2: 0.8~1.2: 0.3~0.7.

[0017] 717 adhesive, when combined with a thinner, forms a colloidal solution that allows for precise adjustment of the 717 adhesive concentrate's consistency. This reduces the adhesive's thick and heavy state, significantly improving application smoothness and optimizing leveling performance. During application, the adhesive layer spreads evenly and to a uniform thickness on the substrate surface, completely avoiding problems caused by excessively thick adhesive, such as uneven application thickness, inconsistent drying speeds, and disordered curing progress. Adding auxiliary agents to the adhesive solution allows for multiple process optimizations. Firstly, it precisely controls the drying rate of the adhesive, balancing the drying rhythm of the 717 adhesive to avoid problems such as insufficient time for finishing after application if the adhesive dries too quickly, or dust accumulation and delays if it dries too slowly. This further optimizes the overall drying efficiency and adapts to the gilding application schedule. Secondly, it effectively enhances the flexibility and extensibility of the cured adhesive layer, alleviating the brittleness problem after hardening and significantly reducing the risk of cracking and peeling during later use, thus improving the durability and lifespan of the finished product. Thirdly, it enhances the adhesive's ability to penetrate and adhere to the substrate, allowing the adhesive to fully adhere to the substrate texture and ensuring a tight bond between the gold leaf and the substrate, effectively reducing construction defects such as bubbles and hollow areas. Simultaneously, it buffers the impact of temperature and humidity changes on the drying state of the gold adhesive, avoiding quality problems such as bubbling, discoloration, and matte fading of the gold leaf, comprehensively ensuring the smoothness, luster, and superior appearance of the finished gilded antique mat.

[0018] As one embodiment, the 717 adhesive is one or a combination of more than one of HR-717 grafted neoprene adhesive, 717 one-component polyurethane adhesive, and 717 adhesive for PVC / UPVC pipes. In this embodiment, the 717 adhesive is a 717 one-component polyurethane adhesive, which is a single-component solvent-free moisture-curing adhesive with a solid content ≥99%. It has good film flexibility, is oil-resistant, resistant to high and low temperatures (-55~110℃), wear-resistant, and water-resistant, and can bond various materials such as metal, glass, plastic, nylon, and fabric.

[0019] As one embodiment, the diluent is one or a combination of two of water and ethanol. In this embodiment, water is used as the diluent. Water is readily available and inexpensive, and can effectively control the mixing and application costs of the adhesive without reducing the quality of construction or affecting the finished product, thereby improving the cost-effectiveness of the process.

[0020] As one embodiment, the auxiliary agent is one or a combination of two of turpentine and gasoline. In this embodiment, the auxiliary agent is turpentine. Through the design of the turpentine composition, the interference of temperature changes on the drying state of the gold adhesive is mitigated, avoiding problems such as bubbling, loss of luster, and matte finish caused by poor adhesion of the gold foil. This effectively improves the appearance quality stability of the finished gold-plated product and breaks through the bottleneck of temperature limitations on gold adhesive in traditional technologies.

[0021] The principle of this invention is to mix 717 adhesive with a thinner to form a colloidal solution, adjusting the consistency of the adhesive to facilitate application and optimize its leveling properties for a more uniform layer distribution. The additives help regulate the drying rate of the adhesive, preventing uneven drying from affecting application; they also enhance the flexibility of the adhesive layer, reducing the risk of cracking later; and they improve the wettability of the adhesive on the substrate, helping the gold foil adhere more smoothly and reducing defects such as bubbles. The colloidal solution and additives are mixed together to form a homogeneous composite water-based adhesive. These three components work synergistically to solve the core problems of traditional gold adhesives, such as slow drying and temperature-dependent gilding effects. Utilizing the fast-drying properties of the prepared gold foil adhesive, gold foil application can be performed directly after application without a long drying period, significantly reducing the gilding process time. Simultaneously, the stable drying and bonding properties of the adhesive ensure uniform drying and stable curing even under fluctuating temperatures, improving production efficiency and product stability at the process level.

[0022] Working principle: 717 adhesive and thinner are mixed together to form a colloidal solution, adjusting the consistency of the adhesive to facilitate application and optimize leveling for a more even distribution. The additives help regulate the drying rate, preventing uneven drying from affecting application; they enhance the flexibility of the adhesive layer, reducing the risk of cracking later; and they improve the wettability of the adhesive on the substrate, helping the gold foil adhere more smoothly and reducing imperfections such as bubbles. The colloidal solution and additives are mixed together to form a homogeneous, composite water-based adhesive. Its strong adhesion firmly bonds the gold foil to the substrate surface, ensuring stability after bonding. Furthermore, its fast drying speed accelerates the drying process, effectively improving overall construction efficiency.

[0023] A process for preparing gold foil adhesive includes the following steps: S1. Initial fusion: Put the 717 glue and thinner into a container and stir for 50-70 seconds to form a colloidal solution, dilute the colloidal molecules, and reduce the viscosity of the colloidal solution. S2. Secondary fusion: Slowly add the auxiliary agent and continue stirring at a constant speed for 2-3 minutes to evenly disperse it in the colloidal solution, adjust the drying rate, toughen it, and improve its wettability; S3. Preparation complete: Stop stirring when the adhesive solution is clear and uniform, without layering, clumping, or flocculent sedimentation, forming a homogeneous composite water-based adhesive colloid; the colloid solution is considered to be of good quality when it has a fine and smooth consistency, moderate fluidity, and is smooth and free of particles when applied.

[0024] S4. Defoaming: Let stand for 25-35 seconds before applying the coating. Avoid prolonged standing, which can cause the auxiliary agents to evaporate and the consistency of the colloidal solution to change.

[0025] As one embodiment, the temperature in steps S1, S2, S3, and S4 is controlled between 20°C and 28°C, and the ambient humidity is controlled between 40% and 70%. No heating or low-temperature refrigeration is required, and high-temperature baking or preheating of the colloidal solution is strictly prohibited. Mixing and application are prohibited when the temperature is below 10°C to avoid uneven dispersion, abnormal curing, and decreased adhesion of the colloidal solution. High-temperature environments can easily cause rapid evaporation of rosin, leading to an imbalance in the colloidal solution ratio and uncontrolled drying.

[0026] As one embodiment, the stirring speed in steps S1, S2, and S3 is ≤300 r / min, avoiding high-speed stirring to prevent the formation of a large number of bubbles in the adhesive and premature evaporation of the rosin. Stirring can be done manually or electrically.

[0027] As one embodiment, the stirring in steps S1, S2, and S3 is carried out in a closed container, which can be electrically stirred to slow down the evaporation rate of the rosin and prevent the viscosity of the adhesive from rising again, thus affecting the quality of the gilding application. Alternatively, it can be carried out in an open container for easy manual stirring.

[0028] As one embodiment, the total stirring time in steps S1, S2, and S3 is controlled to be 3 to 4 minutes.

[0029] The mixing process of the three materials involves no violent chemical reactions, no generation of harmful substances, and no exothermic or gas-producing phenomena. The overall process is a physical dissolution, dispersion, and homogeneous fusion. The 717 adhesive is primarily a water-based polymer adhesive system. Water serves as the dispersion medium to dilute the colloidal molecules and reduce the viscosity of the solution. Rosin, as an inert organic solvent, is uniformly dispersed in the adhesive system, playing a physical role in regulating the drying rate, toughening, and improving wettability. After mixing, a homogeneous composite water-based adhesive colloid is formed. The colloidal solution is stable and contains no new chemically synthesized products. Physical blending optimizes the adhesive's application and molding properties. After curing, the polymer colloid cross-links to form a film, achieving bonding, protection, and toughening effects. During application, additional heating, shaking, and high-speed stirring are prohibited. Excessive deviations in the mixing ratio are also prohibited. The prepared colloidal solution must be used within one hour to prevent rosin evaporation and loss of effectiveness, as well as a return to normal adhesive viscosity, which would affect the quality of the gilding application. Example

[0030] A process for preparing gold foil adhesive includes the following steps: S1. Initial Fusion: Put the 717 glue and thinner into a container and stir for 50 seconds to form a colloidal solution, dilute the colloidal molecules, and reduce the viscosity of the colloidal solution. S2. Secondary fusion: Slowly add the auxiliary agent and continue to stir at a constant speed for 3 minutes to evenly disperse it in the colloidal solution, adjust the drying rate, toughen it, and improve its wettability; S3. Preparation complete: Stop stirring when the adhesive solution is clear and uniform, without layering, clumping, or flocculent sedimentation, forming a homogeneous composite water-based adhesive colloid. S4. Defoaming: Let stand for 25 seconds before applying the coating.

[0031] In steps S1, S2, S3, and S4, the temperature is controlled at 20°C and the ambient humidity is controlled at 40%. In steps S1, S2, and S3, the stirring speed is 200 r / min. Example

[0032] A process for preparing gold foil adhesive includes the following steps: S1. Initial Fusion: Put the 717 glue and thinner into a container and stir for 60 seconds to form a colloidal solution, dilute the colloidal molecules, and reduce the viscosity of the colloidal solution; S2, Secondary Fusion: Slowly add the auxiliary agent and continue stirring at a constant speed for 2.5 minutes to evenly disperse it in the colloidal solution, adjust the drying rate, toughen it, and improve its wettability; S3. Preparation complete: Stop stirring when the adhesive solution is clear and uniform, without layering, clumping, or flocculent sedimentation, forming a homogeneous composite water-based adhesive colloid. S4. Defoaming: Let stand for 30 seconds before applying the coating.

[0033] In steps S1, S2, S3, and S4, the temperature is controlled at 25°C and the ambient humidity is controlled at 55%. In steps S1, S2, and S3, the stirring speed is 250 r / min. Example

[0034] A process for preparing gold foil adhesive includes the following steps: S1. Initial Fusion: Put the 717 glue and thinner into a container and stir for 70 seconds to form a colloidal solution, dilute the colloidal molecules, and reduce the viscosity of the colloidal solution; S2. Secondary fusion: Slowly add the auxiliary agent and continue to stir at a constant speed for 2 minutes to evenly disperse it in the colloidal solution, adjust the drying rate, toughen it, and improve its wettability; S3. Preparation complete: Stop stirring when the adhesive solution is clear and uniform, without layering, clumping, or flocculent sedimentation, forming a homogeneous composite water-based adhesive colloid. S4. Defoaming: Let stand for 25-35 seconds before applying the coating.

[0035] In steps S1, S2, S3, and S4, the temperature is controlled at 28°C, the ambient humidity is controlled at 70%, the stirring speed in steps S1, S2, and S3 is 300 r / min, and the total stirring time in steps S1, S2, and S3 is controlled at 3 to 4 minutes.

[0036] The performance advantages of the present invention, such as drying rate, stability of gold leaf effect, and durability of adhesive layer, were verified by comparing it with the differences of existing conventional gold adhesives.

[0037] I. Comparison Experiment of Drying Rate Experimental subjects: The experimental group was the gold foil adhesive of Example 2 of the present invention; the control group was the conventional gold foil adhesive on the market, specifically gold foil adhesive S145.

[0038] Experimental conditions: In a standard environment of 25°C room temperature and 60% humidity, the two adhesives were evenly applied to the surface of the same batch of gold paint substrate with the same thickness (0.1mm).

[0039] Test method: The time it takes for the adhesive surface to dry completely before gold plating can be applied is recorded using the touch-dry method.

[0040] Experimental results: The drying time of the gold foil adhesive in the control group was 3 hours and 15 minutes; the drying time of the gold foil adhesive in the experimental group was only 22 minutes, with a drying efficiency improvement of about 92%.

[0041] Conclusion: The drying rate of the gold foil adhesive of the present invention far exceeds that of existing gold foil adhesives, which can significantly shorten the waiting time of the gold foil application process.

[0042] II. Stability Experiment of Gilding Effect at Different Temperatures Experimental subjects: The experimental group was the gold foil adhesive of Example 2 of the present invention; the control group was the conventional gold foil adhesive on the market, specifically gold foil adhesive S145.

[0043] Experimental conditions: Three environmental variable groups were set up: low temperature group (10℃, 50% humidity), normal temperature group (25℃, 60% humidity), and high temperature group (35℃, 70% humidity). Each group used the same material substrate and the same specification of gold foil for gilding.

[0044] Test method: 24 hours after the gold leaf is applied, the number of bubbles on the gold leaf surface is counted; the gloss of the gold leaf surface (unit: GU) is measured using a gloss meter.

[0045] Experimental results: Bubbling situation: In the control group, 11 bubbles appeared in the low temperature group and 7 bubbles appeared in the high temperature group; no bubbling occurred in any of the three environmental groups in the experimental group.

[0046] Gloss: The gloss of the control group at low temperature was 71 GU, and that of the control group at high temperature was 74 GU, with a fluctuation range of 3 GU; the gloss of the three environmental groups in the experimental group was stable in the range of 89-91 GU, with a fluctuation range of only 2 GU.

[0047] Conclusion: The gold foil adhesive of the present invention can effectively alleviate the interference of temperature on the gold leaf application effect, avoid the problems of gold foil bubbling, loss of luster and matte finish, and ensure the stability of the appearance quality of the finished product.

[0048] III. Comparative Experiment on Adhesive Layer Durability Experimental subjects: The experimental group consisted of substrate samples coated with gold foil adhesive according to Example 2 of the present invention; the control group consisted of substrate samples coated with conventional gold foil adhesive, specifically substrate samples coated with gold foil adhesive S145.

[0049] Experimental method: The two groups of samples were placed in a temperature cycling environment (-5℃ to 40℃, switching every 12 hours) for 7 days to observe the cracking of the adhesive layer.

[0050] Experimental results: The control group sample showed three obvious cracks in the adhesive layer, each 2-3 cm in length; the experimental group sample showed no cracks in the adhesive layer and good flexibility.

[0051] Conclusion: The gold foil adhesive layer of the present invention has stronger flexibility and better durability than existing gold adhesives, which can reduce the risk of cracking of the adhesive layer in the later stage.

[0052] Based on the above solutions, if various modifications or variations to the present invention do not depart from the spirit and scope of the present invention, and if such modifications and variations fall within the scope of the claims and equivalent technologies of the present invention, then the present invention also intends to include such modifications and variations.

Claims

1. A preparation process for gold foil adhesive, characterized in that: It is composed of raw materials in the following mass ratio: 717 glue: thinner: auxiliary agent = 0.8~1.2: 0.8~1.2: 0.3~0.

7.

2. The preparation process of the gold foil adhesive according to claim 1, characterized in that: The 717 adhesive is one or a combination of more than one of the following: HR-717 grafted neoprene adhesive, 717 single-component polyurethane adhesive, and 717 adhesive for PVC / UPVC pipes.

3. The preparation process of the gold foil adhesive according to claim 1, characterized in that: The diluent is one or a combination of two of water and ethanol.

4. The preparation process of the gold foil adhesive according to claim 1, characterized in that: The auxiliary agent is one or a combination of two of turpentine and gasoline.

5. The preparation process of the gold foil adhesive according to claim 1, characterized in that: It includes the following steps: S1. Initial fusion: Put the 717 glue and thinner into a container and stir for 50-70 seconds to form a colloidal solution, dilute the colloidal molecules, and reduce the viscosity of the colloidal solution. S2. Secondary fusion: Slowly add the auxiliary agent and continue stirring at a constant speed for 2-3 minutes to evenly disperse it in the colloidal solution, adjust the drying rate, toughen it, and improve its wettability; S3. Preparation complete: Stop stirring when the adhesive solution is clear and uniform, without layering, clumping, or flocculent sedimentation, forming a homogeneous composite water-based adhesive colloid. S4. Defoaming: Let stand for 25-35 seconds before applying the coating.

6. The preparation process of the gold foil adhesive according to claim 5, characterized in that: In steps S1, S2, S3, and S4, the temperature is controlled between 20°C and 28°C, and the ambient humidity is controlled between 40% and 70%.

7. The preparation process of the gold foil adhesive according to claim 5, characterized in that: The stirring speed in steps S1, S2, and S3 is ≤300 r / min. According to claim 5, the preparation process of gold foil adhesive is characterized in that the stirring in steps S1, S2, and S3 is carried out in a closed container.

8. The preparation process of a gold foil adhesive according to claim 5, characterized in that: The total stirring time in steps S1, S2, and S3 is controlled to be 3 to 4 minutes.