Preparation process of weather-resistant damping self-adhesive film

Abstract

The invention relates to the technical field of film preparation, in particular to a weather-resistant damping self-sticking film preparation process which comprises the following steps: coating one side of a PET (polyethylene terephthalate) film with damping paint to form a damping coating, coating the other side of the PET film with a high-viscosity and high-weather-resistant acrylic waterproof pressure-sensitive adhesive to form an adhesive surface layer, and coating the adhesive surface layer with a high-viscosity and high-weather-resistant acrylic waterproof pressure-sensitive adhesive to form a weather-resistant self-sticking film. The weather-resistant damping self-adhesive film is prepared by laminating the release film on the adhesive surface layer, rolling and curing. The preparation process of the weather-resistant damping self-sticking film solves the problems of environmental pollution, single applicable substrate, tedious construction steps, non-uniform coating thickness control, high construction requirements and the like caused by spraying construction of a common damping coating, and is a construction method which is ready to use after sticking, simple, efficient, environment-friendly and energy-saving.

Description

Technical Field

[0001] The invention relates to the technical field of film preparation, and in particular to a preparation process of a weather-resistant damping self-adhesive film. Background Art

[0002] Damping coating is made by adding different types and proportions of fillers and auxiliary materials to high molecular polymer resin and mixing them. It is a special coating that can be applied to the surface of various metal plates to achieve vibration reduction, heat insulation and certain sound insulation properties. It is suitable for vibration reduction of various machinery such as aircraft, ships, and vehicles.

[0003] Damping paint is generally sprayed directly on the surface of the metal plate to form a damping coating. For metal plates that are difficult to adhere to, such as copper plates, aluminum alloys, zinc alloys, etc., it needs to be used in conjunction with epoxy primers. The thickness of the damping coating is generally controlled at 1mm-2mm. During construction, it needs to be fully stirred and applied in multiple times. Each time you apply it, you need to wait for the previous coating to dry before applying the next layer. The recommended interval for brushing is generally 24 hours. In addition, the construction of epoxy primers also requires certain conditions and steps, such as the mixing of the primer, coating thickness, drying time, etc., which all need to be considered, and the compatibility between the primer and the damping coating must be ensured. In summary, it can be seen that damping coatings have cumbersome construction steps and a long construction period. The applicable substrate is generally a metal plate, which limits its scope of use. In addition, the brushing process has the problem of uneven coating thickness control, which makes the cost difficult to control. At the same time, multiple coatings have high construction requirements, and the intervals between coatings need to be reasonably controlled. If these issues are not paid attention to, it is easy to cause adhesion problems between coatings, which in turn affects the damping coating's ability to reduce vibration, heat and sound, causing the damping coating to fail prematurely during use and reducing its service life. Summary of the invention

[0004] The purpose of the present invention is to provide a weather-resistant damping self-adhesive film preparation process to solve the technical problems in the prior art that the damping coating is sprayed in a complicated construction process, the applicable substrate is single, and the construction quality is difficult to guarantee.

[0005] In order to solve the above problems, the present invention provides a weather-resistant damping self-adhesive film preparation process adopts the following technical solution: A preparation process for a weather-resistant damping self-adhesive film comprises the following steps: coating a damping coating on one side of a PET film to form a damping coating, coating a high-adhesion and high-weather-resistant acrylic waterproof pressure-sensitive adhesive on the other side of the PET film to form an adhesive surface layer, and rolling up the adhesive surface layer after bonding a release film, and then curing the adhesive surface layer to obtain the weather-resistant damping self-adhesive film.

[0006] Preferably, the thickness of the PET film is any one of 38um, 50um, and 100um.

[0007] Preferably, the thickness of the damping coating is any one of 1 mm, 1.5 mm, and 2 mm.

[0008] Preferably, the peeling force specification of the high-adhesion and high-weather-resistant acrylic waterproof pressure-sensitive adhesive is any one of 1500g / 25mm, 2000g / 25mm, and 3000g / 25mm.

[0009] Preferably, the thickness of the release film is any one of 25um, 36um, and 50um.

[0010] Preferably, the release force specification of the release film is any one of 5g / mm, 10g / mm, and 15g / mm.

[0011] Preferably, the high-viscosity and high-weather-resistant acrylic waterproof pressure-sensitive adhesive is coated on the surface of the PET film by a scraper coater, which includes a first baking chamber, a conveying roller, a first supporting roller, a coating roller, a scraper roller and a liquid storage tank, wherein the conveying roller is used to convey the PET film, the first supporting roller is arranged opposite to the coating roller, and the liquid storage tank is used to store the high-viscosity and high-weather-resistant acrylic waterproof pressure-sensitive adhesive liquid; the coating roller is rotatably assembled in the liquid storage tank to be immersed in the high-viscosity and high-weather-resistant acrylic waterproof pressure-sensitive adhesive liquid, and is used to coat the high-viscosity and high-weather-resistant acrylic waterproof pressure-sensitive adhesive liquid on the surface of the PET film; the scraper roller is located beside the supporting roller, and the scraper roller has a scraper portion for scraping the high-viscosity and high-weather-resistant acrylic waterproof pressure-sensitive adhesive liquid adhered to the PET film to a set thickness, and the projection of the scraper portion in the up and down directions is located in the liquid storage tank; the first baking chamber is located on the rear side of the first supporting roller in the conveying direction of the PET film.

[0012] Preferably, the coating line speed of the coating roller is in the range of 20 m / min to 25 m / min, the baking temperature of the first baking chamber is in the range of 100° C. to 120° C., and the thickness of the adhesive surface layer is in the range of 10 um to 20 um.

[0013] Preferably, the damping coating is coated on the side of the PET film facing away from the adhesive layer by a slit die coater, the slit die coater comprising an upper die, a lower die, a second support roller and a second baking chamber, the upper die and the lower die are arranged at intervals to form a slit for the damping coating to pass through, the second support roller is located beside the outlet of the slit, the height at which the axis of the second support roller is located is the same as the height at which the center of the slit is located, a gap is left between the second support roller and the outlet of the slit to form a set thickness of the damping coating on the surface of the PET film, and the second baking chamber is located on the rear side of the second support roller in the conveying direction of the PET film; the thickness of the damping coating is controlled to be 1 mm~2 mm, the baking temperature range of the second baking chamber is 120°C~130°C, and the coating line speed range is 10m / min~20m / min.

[0014] Preferably, the aging temperature ranges from 50°C to 55°C, and the aging time ranges from 3 to 5 days.

[0015] The beneficial effects of the weather-resistant damping self-adhesive film preparation process of the present invention are: The present invention can adopt an online coating process, apply a damping coating on one side of a PET film to form a damping coating, and apply a high-viscosity weather-resistant acrylic waterproof pressure-sensitive adhesive on the other side of the PET film to form an adhesive surface layer, thereby forming a prefabricated weather-resistant damping self-adhesive film. When in use, the weather-resistant damping self-adhesive film can be cut into a suitable size as needed, and after the release film is torn off, the adhesive surface layer can be attached to the corresponding substrate. After the prefabricated weather-resistant damping self-adhesive film is formed by the coating process, it can be attached and used immediately, without the need for multiple glue preparation and multiple brushing construction on site, which greatly shortens the construction period and significantly reduces the construction difficulty.

[0016] When using the online coating process, the thickness of the damping coating and the adhesive surface layer can be controlled more accurately, which is beneficial to cost accounting; the one-time bonding molding process avoids the shortcomings of multiple brushing processes and greatly ensures the effectiveness of the damping coating. At the same time, after using high-viscosity and high-weather-resistant acrylic waterproof pressure-sensitive adhesive, the weather-resistant damping self-adhesive film can be applied to more substrates, such as glass surfaces, concrete bottoms, and alloy surfaces, which greatly broadens the application scenarios of the damping coating and is convenient for customers to use. It also adopts a removable self-adhesive film form, and no residual adhesive is left after removal, which is convenient for replacing and repairing aged and failed damping coatings. In addition, the use of high-viscosity and high-weather-resistant waterproof acrylic pressure-sensitive adhesive makes the damping coating of the self-adhesive film process better suitable for outdoor environments and has long-term aging resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein: Figure 1 It is a schematic diagram of the process for preparing the weather-resistant damping self-adhesive film of the present invention; Figure 2 It is a schematic diagram of coating the damping coating in the preparation process of the weather-resistant damping self-adhesive film of the present invention; Figure 3 It is a schematic diagram of coating the adhesive surface layer in the preparation process of the weather-resistant damping self-adhesive film of the present invention.

[0018] Description of reference numerals: 1. PET film; 2. First support roller; 3. Coating roller; 4. Scraper roller; 5. Liquid storage tank; 6. Conveying roller; 7. Upper mold; 8. Lower mold; 9. Damping coating; 10. Second support roller; 11. Adhesive surface layer; 12. High-viscosity and high-weather-resistant acrylic waterproof pressure-sensitive adhesive; 13. Drainage plate; 14. Damping coating. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0020] The principle and spirit of the present invention are explained in detail below with reference to several representative embodiments of the present invention.

[0021] Specific embodiments of the preparation process of the weather-resistant damping self-adhesive film provided by the present invention: like Figure 1-Figure 3 As shown, the specific process of the preparation process of the weather-resistant damping self-adhesive film of the present invention is: a damping coating 9 is coated on one side of the PET film 1 to form a damping coating 14, and a high-adhesion and high-weather-resistant acrylic waterproof pressure-sensitive adhesive 12 is coated on the other side of the PET film 1 to form an adhesive surface layer 11, and the adhesive surface layer 11 is adhered to a release film and then rolled up as a whole, and then placed in a curing chamber for curing, and the weather-resistant damping self-adhesive film can be obtained after curing.

[0022] Damping coating 9 mainly achieves vibration reduction and noise reduction by converting mechanical energy (such as vibration energy) into heat energy. It relies on its own viscoelasticity. When it is vibrated, the molecular chains produce relative movement, friction generates heat, and thus consumes energy. This energy dissipation mechanism is like an "energy absorber", which suppresses the vibration response of the structure and reduces the radiation of sound.

[0023] The high-viscosity and high-weather-resistant acrylic waterproof pressure-sensitive adhesive 12 has the characteristics of high viscosity, high weather resistance and waterproofness. The high viscosity is mainly reflected in the ability to firmly adhere to the surface of various materials and is not easy to fall off. Even when subjected to large external force or long-term use, it can maintain a good adhesion effect; the high weather resistance is mainly reflected in the fact that the high-viscosity and high-weather-resistant acrylic waterproof pressure-sensitive adhesive 12 has excellent weather resistance and can maintain stable performance under different climatic conditions. Whether it is a high temperature, low temperature, humid or dry environment, it will not have a significant effect on its viscosity and adhesion effect; the waterproofness is mainly reflected in the fact that the high-viscosity and high-weather-resistant acrylic waterproof pressure-sensitive adhesive 12 can effectively prevent the penetration of moisture, ensuring that the adhesive part can still maintain a firm adhesion after contact with water. This feature makes it suitable for some occasions that require waterproof sealing.

[0024] Therefore, the weather-resistant damping self-adhesive film has the characteristics of damping coating 9 and high-adhesion and high-weather-resistant acrylic waterproof pressure-sensitive adhesive 12, and can be adhered to occasions such as window glass, warehouse floors, outdoor stadiums, etc. that require sound insulation, vibration reduction, and heat insulation. It can be widely used for shock absorption in automobiles, airplanes, machinery, etc., as well as sound insulation and heat insulation in homes, hospitals, etc.

[0025] In the actual coating, an online coating process is adopted. Among them, the high-adhesion and high-weather-resistant acrylic waterproof pressure-sensitive adhesive 12 is coated on the surface of the PET film 1 by a scraper coater. Figure 2As shown, the blade coating machine has a first baking chamber, a conveying roller 6, a first supporting roller 2, a coating roller 3, a scraper roller 4 and a liquid storage tank 5. The conveying roller 6 is used to convey the PET film 1. The first supporting roller 2 and the coating roller 3 are arranged opposite to each other up and down, and the axes of the two are parallel. There is a gap between the first supporting roller 2 and the coating roller 3 for the PET film 1 to pass through. The liquid storage tank 5 is used to store the high-viscosity and high-weather-resistant acrylic waterproof pressure-sensitive adhesive 12. The coating roller 3 is rotatably assembled in the liquid storage tank 5 and immersed in the high-viscosity and high-weather-resistant acrylic waterproof pressure-sensitive adhesive 12. The surface of the coating roller 3 is adhered with the high-viscosity and high-weather-resistant acrylic waterproof pressure-sensitive adhesive 12. When rotating, the high-viscosity and high-weather-resistant acrylic waterproof pressure-sensitive adhesive 12 on its surface is coated on the surface of the PET film 1. The scraper roller 4 is located beside the first support roller 2. The scraper roller 4 has a scraper portion. The scraper portion can scrape the high-viscosity and high-weather-resistant acrylic waterproof pressure-sensitive adhesive 12 adhered to the PET film 1 to a set thickness. The projection of the scraper portion in the up-down direction is located in the liquid reservoir 5. The glue scraped off by the scraper portion can fall back into the liquid reservoir 5 for use. A drainage plate 13 inclined toward the inside of the liquid reservoir 5 is provided at the notch of the liquid reservoir 5. The drainage plate 13 is located below the scraper roller 4 and can guide the high-viscosity and high-weather-resistant acrylic waterproof pressure-sensitive adhesive 12 on the portion of the scraper roller 4 between the scraper portion and the drainage plate 13 into the liquid reservoir 5. The first baking chamber is located at the rear side of the first support roller 2 in the conveying direction of the PET film 1, that is, the PET film 1 coated with the high-viscosity and high-weather-resistant acrylic waterproof pressure-sensitive adhesive 12 is conveyed to the first baking chamber for baking. Baking can remove the solvent in the high-viscosity and high-weather-resistant acrylic waterproof pressure-sensitive adhesive 12, promote the curing of the high-viscosity and high-weather-resistant acrylic waterproof pressure-sensitive adhesive 12, and form a more stable adhesive surface layer, so that the adhesion between the high-viscosity and high-weather-resistant acrylic waterproof pressure-sensitive adhesive 12 and the PET film 1 is stronger. The coating line speed range of the coating roller 3 is controlled to be 20m / min~25m / min, the baking temperature range of the first baking chamber is controlled to be 100℃~120℃, and the thickness range of the adhesive surface layer is 10um~20um.

[0026] like Figure 3As shown, the damping coating 9 is coated on the side of the PET film 1 facing away from the adhesive layer 11 by a slit die coater. The slit die coater is a prior art, which includes an upper mold 7, a lower mold 8, a second support roller 10, and a second baking chamber. The upper mold 7 and the lower mold 8 are arranged at intervals to form a slit for the damping coating 9 to pass through. The second support roller 10 is located beside the outlet of the slit. The height of the axis of the second support roller 10 is the same as the height of the center of the slit. A gap is left between the second support roller 10 and the outlet of the slit to form a set thickness of the damping coating 14 on the surface of the PET film 1. The damping coating 9 flowing out of the slit enters the gap between the second support roller 10 and the slit. Since the PET film 1 is wound on the second support roller 10, the damping coating 9 can be coated on the surface of the PET film 1. The second baking chamber is located at the rear side of the second support roller 10 in the conveying direction of the PET film 1. The PET film 1 coated with the damping coating 9 enters the second baking chamber, which can remove the solvent component in the damping coating 9, accelerate the curing of the damping coating 9, and enhance the adhesion between the damping coating 14 and the PET film 1. The thickness of the damping coating 14 is controlled to be 1mm~2mm, the baking temperature range of the second baking chamber is controlled to be 120℃-130℃, and the coating line speed range is controlled to be 10m / min~20m / min.

[0027] When actually selecting materials, the thickness specification of the PET film 1 can be selected from any one of 38um, 50um, and 100um.

[0028] The thickness of the damping coating 14 is selected from any one of 1 mm, 1.5 mm, and 2 mm.

[0029] The peeling force specification of the high-adhesion and high-weather-resistant acrylic waterproof pressure-sensitive adhesive 12 is selected from any one of 1500g / 25mm, 2000g / 25mm, and 3000g / 25mm.

[0030] The thickness of the release film can be any one of 25um, 36um, and 50um.

[0031] The release force specification of the release film can be selected from any one of 5g / mm, 10g / mm, and 15g / mm.

[0032] The aging temperature ranges from 50°C to 55°C, and the aging time ranges from 3 to 5 days.

[0033] It should be noted that although the above provides the optional thickness of the PET film 1, the thickness of the damping coating 14, the thickness of the release film, the release force specification of the release film, the baking temperature range of the first baking chamber, the baking temperature range of the second baking chamber, the peeling force specification of the high-viscosity and high-weather-resistant acrylic waterproof pressure-sensitive adhesive 12, the linear speed range of the coating roller 3, the aging temperature range and the aging time range; however, in the actual processing process, one of the specific thickness of the PET film 1, the thickness of the damping coating 14, the thickness of the release film, the release force specification of the release film, the baking temperature of the first baking chamber, the baking temperature of the second baking chamber, the peeling force of the high-viscosity and high-weather-resistant acrylic waterproof pressure-sensitive adhesive 12, the linear speed of the coating roller 3, the aging temperature and the aging time should be selected according to specific needs.

[0034] Of course, the coating is not limited to the blade coater and slot die coater used in this embodiment, and a roller coater, brush coater, or other coater capable of implementing an online coating process may also be used.

[0035] The process adopted by the present invention can attach the damping coating 14 and the adhesive surface layer 11 to the PET film 1 by coating in advance to form a prefabricated weather-resistant damping self-adhesive film. When in use, the weather-resistant damping self-adhesive film can be cut into suitable sizes as needed, and after the release film is torn off, the adhesive surface layer is directly bonded to the corresponding substrate, so that it can be used immediately after being pasted, without the need for multiple glue preparation and multiple brushing construction on site, which greatly shortens the construction period and significantly reduces the construction difficulty. The thickness of the damping coating and the adhesive surface layer can be controlled more accurately, which is conducive to cost accounting; the one-time bonding molding process avoids the shortcomings of multiple brushing processes and greatly ensures the effectiveness of the damping coating 14. At the same time, after using the high-adhesion and high-weather-resistant acrylic waterproof pressure-sensitive adhesive 12, the weather-resistant damping self-adhesive film can be applied to more substrates, greatly broadening the application scenarios of the damping coating 14, and adopts a removable self-adhesive film form, which does not leave residual glue after removal, and is convenient for replacing and repairing the aging and failed damping coating 14. The process of the present invention solves the problems of environmental pollution, single applicable substrate, complicated construction steps, uneven coating thickness control, high construction requirements, etc. caused by the spraying construction of ordinary damping coating 14. It is a construction method that is ready to use, simple, efficient, environmentally friendly and energy-saving.

[0036] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A process for preparing a weather-resistant damping self-adhesive film, characterized in that: A damping coating is coated on one side of a PET film to form a damping coating, and a high-adhesion and high-weather-resistant acrylic waterproof pressure-sensitive adhesive is coated on the other side of the PET film to form an adhesive surface layer. The adhesive surface layer is then rolled up after being bonded with a release film, and then cured to obtain a weather-resistant damping self-adhesive film.

2. A process for preparing a weather-resistant damping self-adhesive film according to claim 1, characterized in that: The thickness of the PET film is any one of 38um, 50um and 100um.

3. The process for preparing a weather-resistant damping self-adhesive film according to claim 1, characterized in that: The thickness of the damping coating is any one of 1 mm, 1.5 mm, and 2 mm.

4. The process for preparing a weather-resistant damping self-adhesive film according to claim 1, characterized in that: The peeling force specification of the high-adhesion and high-weather-resistant acrylic waterproof pressure-sensitive adhesive is any one of 1500g / 25mm, 2000g / 25mm, and 3000g / 25mm.

5. The process for preparing a weather-resistant damping self-adhesive film according to claim 1, characterized in that: The thickness of the release film is any one of 25um, 36um, and 50um.

6. A process for preparing a weather-resistant damping self-adhesive film according to claim 5, characterized in that: The release force specification of the release film is any one of 5g / mm, 10g / mm, and 15g / mm.

7. A process for preparing a weather-resistant damping self-adhesive film according to any one of claims 1 to 6, characterized in that: The high-viscosity and high-weather-resistant acrylic waterproof pressure-sensitive adhesive is coated on the surface of the PET film by a blade coater, which includes a first baking chamber, a conveying roller, a first supporting roller, a coating roller, a blade roller and a liquid storage tank, wherein the conveying roller is used to convey the PET film, the first supporting roller is arranged opposite to the coating roller, and the liquid storage tank is used to store the high-viscosity and high-weather-resistant acrylic waterproof pressure-sensitive adhesive liquid; The coating roller is rotatably assembled in the liquid storage tank to be immersed in the high-viscosity and high-weather-resistant acrylic waterproof pressure-sensitive adhesive liquid, and is used to coat the high-viscosity and high-weather-resistant acrylic waterproof pressure-sensitive adhesive liquid on the surface of the PET film; the scraper roller is located beside the first supporting roller, and the scraper roller has a scraper part for scraping the high-viscosity and high-weather-resistant acrylic waterproof pressure-sensitive adhesive liquid adhered to the PET film to a set thickness, and the projection of the scraper part in the up and down directions is located in the liquid storage tank; the first baking chamber is located on the rear side of the first supporting roller in the conveying direction of the PET film.

8. A process for preparing a weather-resistant damping self-adhesive film according to claim 7, characterized in that: The coating line speed range of the coating roller is 20m / min~25m / min, the baking temperature range of the first baking chamber is 100℃~120℃, and the thickness range of the adhesive surface layer is 10um~20um.

9. The process for preparing a weather-resistant damping self-adhesive film according to claim 7, characterized in that: The damping coating is coated on the side of the PET film facing away from the adhesive layer by a slit die coater. The slit die coater comprises an upper die, a lower die, a second support roller and a second baking chamber. The upper die and the lower die are arranged at intervals to form a slit for the damping coating to pass through. The second support roller is located beside the outlet of the slit. The height at which the axis of the second support roller is located is the same as the height at which the center of the slit is located. A gap for forming a set damping coating thickness on the surface of the PET film is left between the second support roller and the outlet of the slit. The second baking chamber is located on the rear side of the second support roller in the conveying direction of the PET film. The thickness of the damping coating is controlled at 1 mm to 2 mm. The baking temperature range of the second baking chamber is 120° C. to 130° C., and the coating line speed range is 10 m / min to 20 m / min.

10. A process for preparing a weather-resistant damping self-adhesive film according to any one of claims 1 to 6, characterized in that: The aging temperature ranges from 50°C to 55°C, and the aging time ranges from 3 to 5 days.

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