A car sticker with air guide groove, preparation method and application thereof

Abstract

The application provides a car sticker with air guide grooves, a preparation method and application thereof, and the car sticker comprises a functional layer, an air guide groove glue surface layer and release paper which are sequentially stacked, and the side surface of the release paper facing the air guide groove glue surface layer is provided with a concave-convex 3D microstructure pattern; the air guide groove glue surface layer is provided with a slit-shaped air guide groove, the slit-shaped air guide groove is matched with the 3D microstructure pattern and is formed by compression molding, and the slit-shaped air guide groove extends to the edge of the air guide groove glue surface layer. The car sticker with air guide grooves, the preparation method and application thereof can improve the existing car sticker, effectively discharge air bubbles and do not significantly affect the adhesive property, the car sticker is provided with special air guide microstructures on the glue surface layer, air can be quickly discharged during construction, air bubble generation is fundamentally avoided, the adhesive property is not affected, and the car sticker structure is simple and easy to industrialize.

Description

Technical Field

[0001] This invention relates to the field of polymer composite materials technology, specifically to a film material for advertising and vehicle body decoration, and in particular to a vehicle sticker with active venting function that can effectively avoid the generation of air bubbles during construction, as well as its preparation method and application. Background Technology

[0002] Vehicle stickers, also known as car body stickers or spray-painted car body stickers, are flexible film materials composed of functional layers (such as PVC layers), adhesive layers, and release paper (or silicone paper). They are widely used for advertising and decoration on vehicle bodies, glass windows, advertising display boards, and other fields.

[0003] In existing technologies, installers often face a thorny problem when applying large-format vehicle stickers to target surfaces: due to the large size of the stickers, air is easily trapped between the adhesive layer and the surface during the application process, making it difficult to completely expel and forming air bubbles of varying sizes. These bubbles not only severely affect the flatness and aesthetics of the advertisement, reducing its effectiveness, but can also cause the adhesive to adhere poorly due to air accumulation. Under external forces such as wind, sun exposure, or car washing, the edges of the sticker are prone to lifting and falling off, shortening its lifespan. To eliminate these air bubbles, installers usually need to repeatedly scrape and press with a scraper or use a fine needle to puncture the bubbles before smoothing them out. This is not only difficult and inefficient, but also requires a high level of skill from the installers and may even scratch the sticker or the surface it is applied to during the process.

[0004] Existing technologies attempt to address this problem by adding air-guiding particles to the adhesive or making the adhesive layer breathable. However, this often comes at the cost of sacrificing the initial tack, holding power, or final bond strength of the adhesive, potentially leading to premature detachment of the vehicle sticker. Other technologies employ more complex multi-layer structures, increasing cost and manufacturing complexity. Therefore, there is an urgent need in the field for a vehicle sticker solution that effectively removes bubbles without significantly affecting adhesive performance, and is simple in structure and easy to industrially produce. Summary of the Invention

[0005] The purpose of this invention is to provide a car sticker with air-guiding grooves, its preparation method, and its application. It solves the technical problem of how to improve existing car stickers so that they can effectively remove bubbles without significantly affecting adhesive performance. The car sticker of this invention has a special air-guiding microstructure set in the adhesive layer, which can guide air to be quickly discharged during construction, fundamentally avoiding the generation of bubbles without affecting adhesive performance. The car sticker structure in this solution is simple and easy to industrialize.

[0006] A car sticker with air guide grooves includes a functional layer, an air guide groove adhesive layer, and a release paper stacked sequentially. The release paper has a 3D microstructure pattern with concave and convex shapes on the side facing the air guide groove adhesive layer. The air guide groove adhesive layer is provided with slit-shaped air guide grooves. The slit-shaped air guide grooves are matched and embossed with the 3D microstructure pattern and extend to the edge of the air guide groove adhesive layer.

[0007] The slit-shaped air guide groove includes a raised air guide groove and / or a recessed air guide groove. The raised air guide groove has a raised height of 10-25 μm, and the recessed air guide groove has a recessed depth of 5-15 μm. The thickness of the adhesive layer of the air guide groove is 20-40 μm.

[0008] The cross-sectional shape of the slit-shaped air guide groove is one or more combinations of trapezoidal, arc-shaped, or wavy.

[0009] By mass fraction, the pressure-sensitive adhesive used in the air guide groove adhesive layer contains 0.5%-2% nano-spherical silica particles, 0.5%-1% microcapsules coated with diatomaceous earth, 1%-1.5% tetrafluoroethylene, and 0.5%-1% defoamer. The particle size of the nano-spherical silica, the microcapsule, and the tetrafluoroethylene is all less than half the depth of the recessed gas guide groove.

[0010] By mass fraction, (nanospherical silica particles + microcapsules) / tetrafluoroethylene = 1-3.

[0011] By mass fraction, the pressure-sensitive adhesive also contains 0.5-0.8% fumed silica and 0.1-0.3% diluent, wherein (tetrafluoroethylene + fumed silica) / diluent = 5-20.

[0012] The functional layer, by mass fraction, is any one of PVC, PET, and PP layers, with a thickness of 80-150 μm; The release paper is any one of glassine release paper, kraft paper release paper, or PET release paper, and its surface 3D microstructure pattern is made by laser engraving, chemical etching, or embossing process. The defoamer is any one of polyether defoamers, mineral oil defoamers, polyether-modified polysiloxanes, acrylic copolymers, and polyether-modified organosilicones.

[0013] Preferably, the pressure-sensitive adhesive used in the air guide groove adhesive layer is one of acrylic pressure-sensitive adhesive, rubber pressure-sensitive adhesive or silicone pressure-sensitive adhesive. These particles, as spacers, help maintain the microscopic gaps in part of the air guide groove when under pressure.

[0014] Preferably, a repair agent can also be encapsulated in the microcapsule. When the adhesive layer develops microcracks due to external force, the cracks expand and cause the microcapsule to rupture. The released repair agent fills the cracks and reacts with the active groups on the surface of nano-silica or the matrix resin to achieve self-repair of the adhesive layer.

[0015] Preferably, thermally or electrically conductive materials can also be encapsulated in the microcapsules, so that after it is ruptured under pressure, local functional pathways can be formed within the adhesive layer, while nano-silica acts as a framework to ensure overall strength.

[0016] The method includes the following steps: Step S1: Preparation of release paper with 3D microstructure pattern: Select base paper and process the designed concave and convex 3D microstructure pattern on one side through laser engraving, chemical etching or precision embossing process. Then, apply release agent to the surface and obtain patterned release paper after curing. Step S2: Prepare modified pressure-sensitive adhesive by quantitatively adding nano-spherical silica particles, microcapsules coated with diatomaceous earth, tetrafluoroethylene, defoamer, fumed silica, and diluent to the pressure-sensitive adhesive to obtain the modified pressure-sensitive adhesive. Step S3: The prepared pressure-sensitive adhesive solution is evenly applied to the surface of the patterned release paper with 3D microstructure patterns using slot coating or roller coating. While the adhesive solution is not fully cured (in a semi-cured or plastic state), it is pressed by a pair of precision rollers to fully imprint the pattern of the release paper into the adhesive layer, forming an adhesive surface layer with complementary air-guiding grooves. Subsequently, it is heated in an oven tunnel to fully cure the adhesive layer, forming an air-guiding groove adhesive surface layer. Step S4: Dry-laminate or hot-press the functional layer film (such as PVC film) with the cured air guide groove adhesive layer in step S2 using a laminating roller to ensure a firm bond between the two. Step S5: Cure the composite material at room temperature or slightly above room temperature for 24-48 hours, and then cut it into rolls of predetermined width and length according to requirements.

[0017] This invention provides the application of the above-mentioned vehicle sticker with air guide groove in the fields of advertising, vehicle body decoration, glass window tinting, and surface decoration and protection of electronic products.

[0018] Because the car sticker of this invention has excellent bubble removal performance during construction, it is particularly suitable for application scenarios with large size, high flatness requirements, and curved surfaces (such as the curved surface of a car body).

[0019] The beneficial effects of this invention are as follows: (1) The present invention innovatively pre-sets a microscopic air guide groove network on the adhesive layer. During construction, when the car sticker is applied to the surface, the compressed air will quickly diffuse and be discharged to the edge along these interconnected air guide grooves, just like laying a "dedicated highway" for the air, thus actively solving the problem of air bubble residue from a physical structure perspective.

[0020] Especially as the construction workers scrape and press down at the end, the adhesive generates micro-flow under pressure, partially filling the air channel, and ultimately maximizing the contact area between the adhesive and the substrate, ensuring that the final bonding strength is not affected, and may even be enhanced due to the denser contact. (2) The pressure-sensitive adhesive in this scheme is made of microcapsules coated with diatomaceous earth and tetrafluoroethylene. On the one hand, the porous filler such as diatomaceous earth is coated in the microcapsules and water-based pressure-sensitive adhesive is added. When the adhesive is pressed, the capsules rupture and the porous material can adsorb air and moisture on the surface, thereby avoiding microbubbles. On the other hand, the introduction of fluorinated monomers (such as tetrafluoroethylene) into the water-soluble acrylic adhesive can significantly reduce the surface tension of the adhesive. This makes the adhesive more wettable to the substrate, more uniformly coated, and can effectively expel air.

[0021] Finally, in terms of production process, curing the release paper with a silicone layer can reduce the transfer of silicone oil to the adhesive layer, preventing the resulting decrease in adhesion and bubbling. (3) By mixing nano-spherical silica, microcapsules, and tetrafluoroethylene in pressure-sensitive adhesive, the following technical effects are achieved through the combined synergistic effect of the three: Nano-sized silica particles are uniformly dispersed in the colloid, forming an invisible "skeleton", which significantly improves the cohesiveness, heat resistance and creep resistance of the colloid, and solves the problem of pressure-sensitive adhesives easily slipping when subjected to stress or heat. In addition to the functions mentioned above, microcapsules can also be seen as tiny "stress modulators." When the adhesive layer is subjected to external force, they may absorb energy through their own deformation or rupture, blunting the crack tips and thus improving the toughness and impact resistance of the adhesive layer to a certain extent. Finally, the tetrafluoroethylene component can effectively reduce the surface energy of the pressure-sensitive adhesive, enabling it to wet and bond low surface energy substrates such as polyolefins and fluoroplastics that are difficult for traditional pressure-sensitive adhesives to adhere to. (4) When tetrafluoroethylene, fumed silica, and diluent are added to the pressure-sensitive adhesive, the synergistic effect of these three materials will produce the following comprehensive technical effect: First, the fumed silica forms a three-dimensional network, providing a solid framework for the colloid and significantly improving its cohesiveness, heat resistance and shear creep resistance. In addition, the addition of thixotropic agents such as fumed silica helps the adhesive to thicken and become non-flowing when at rest, and to thin out when subjected to shear forces (such as stirring or brushing), which helps to expel air bubbles during brushing and allows it to quickly set after brushing to prevent air bubbles from being mixed in again. Secondly, diluents (such as monofunctional acrylates) reduce the viscosity of the system. Combined with the thixotropic properties of fumed silica and the regulating effect of defoamers, the adhesive has good fluidity and is easy to apply during coating. After coating is stopped, the viscosity recovers quickly, preventing the adhesive layer from sagging or penetrating, ensuring coating uniformity, and improving initial tack and peel strength. Third, the thinner can also help the adhesive better wet the substrate surface. In particular, combined with the affinity of tetrafluoroethylene for low surface energy materials, it can significantly improve the adhesion to difficult-to-bond substrates such as polyolefins and fluoroplastics. Ultimately, this structure allows the colloid to resist deformation (strong holding power) through a rigid network and dissipate energy (high peel strength) through flexible segments when subjected to force, thus achieving a balance between holding power and peel strength.

[0022] (5) This invention can be achieved simply by improving the molding process of the release paper and adhesive layer. No additional material layer or complex structure is required. Existing coating and composite equipment can be upgraded and modified. The cost of industrial production is controllable and easy to promote. The bubble-free bonding means that there are no air gaps between the adhesive and the substrate. The bonding is uniform and firm, which can better resist the stress caused by environmental temperature changes, rain erosion, vibration, etc., thereby effectively preventing edge lifting and overall detachment, and extending the service life of the car sticker.

[0023] (6) The cross-sectional shape of the slit-shaped air guide groove in this scheme is one or more combinations of trapezoidal, arc or wave shape. This non-vertical wall design is conducive to the moderate deformation and filling of the colloid when under pressure, which not only ensures the temporary existence of the exhaust channel, but also promotes the full contact between the adhesive and the bonding surface after final compaction, so as to achieve the effect of "exhausting first and then sealing". Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the vehicle sticker in this invention.

[0025] Figure 2 This is a schematic diagram of the structure of the air guide groove adhesive layer in this invention.

[0026] Figure 3 This is a schematic diagram of the effect of the car sticker in test group 1 of embodiment 1 of the present invention.

[0027] Figure 4 This is a schematic diagram illustrating the effect of the sticker on vehicle A in Example 2 of the present invention.

[0028] The attached diagram shows: 1. Functional layer; 2. Air guide groove adhesive layer; 3. Release paper. Detailed Implementation

[0029] To more clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution. Example

[0030] See Figures 1-2 A car sticker with air guide grooves includes a functional layer 1, an air guide groove adhesive layer 2, and a release paper 3 stacked in sequence. The release paper 3 has a 3D microstructure pattern with concave and convex shapes on the side facing the air guide groove adhesive layer 2. The air guide groove adhesive layer 2 is provided with slit-shaped air guide grooves. The slit-shaped air guide grooves are matched and embossed with the 3D microstructure pattern and extend to the edge of the air guide groove adhesive layer 2.

[0031] The slit-shaped air guide groove includes a raised air guide groove and / or a recessed air guide groove. The raised height of the raised air guide groove is 10-25μm, and the recessed depth of the recessed air guide groove is 5-15μm. The thickness of the adhesive layer 2 of the air guide groove is 20-40μm.

[0032] The cross-sectional shape of the slit-shaped air guide groove is one or more combinations of trapezoidal, arc-shaped, or wavy.

[0033] By mass fraction, the pressure-sensitive adhesive used in the air guide groove adhesive layer 2 contains 0.5%-2% nano-spherical silica particles, 0.5%-1% microcapsules coated with diatomaceous earth, 1%-1.5% tetrafluoroethylene, and 0.5%-1% defoamer. The particle size of the nano-spherical silica, the microcapsule, and the tetrafluoroethylene is all less than half the depth of the recessed gas guide groove.

[0034] By mass fraction, the functional layer 1 is any one of PVC layer, PET layer, and PP layer, and its thickness is 80-150μm; The release paper 3 is any one of glassine release paper, kraft paper release paper, or PET release paper, and its surface 3D microstructure pattern is made by laser engraving, chemical etching, or embossing process. In this embodiment 1, the defoamer is a polyether-based defoamer.

[0035] In this embodiment 1, the pressure-sensitive adhesive used in the air guide groove adhesive layer 2 is an acrylic pressure-sensitive adhesive. These particles, as spacers, help maintain the microscopic voids of part of the air guide groove when under pressure.

[0036] By mass fraction, (nanospherical silica particles + microcapsules) / tetrafluoroethylene = 1-3. In Example 1, the following three sets of experiments were designed to account for the variables of the three components: nanospherical silica particles, microcapsules, and tetrafluoroethylene: See Figure 3Experimental group 1: 1.0% nano-spherical silica particles, 0.5% microcapsules coated with diatomaceous earth, 1.5% tetrafluoroethylene, and 0.5% defoamer; Experimental Group 2: 1.5% nano-spherical silica particles, 1.0% diatomaceous earth-coated microcapsules, 1.4% tetrafluoroethylene, and 0.5% defoamer; Test group 3: 2.0% nano-spherical silica particles, 1.0% microcapsules coated with diatomaceous earth, 1.0% tetrafluoroethylene, and 0.5% defoamer; Table 1 shows the test performance of the car sticker in each test group.

[0037] Table 1 shows the test performance of the car stickers in each test group. experimental group Time required for the surface to be flat and free of air bubbles Number of bubbles Peel strength test / 25mm Peel strength retention rate after weathering test Experimental group 1 17min none 8.5N 85% Experimental group 2 12min none 8.9 87% Experimental group 3 13min none 9.2 91% As can be seen from Table 1, in experimental groups 1-3, the time required for bubble-free application after flattening decreases with the increase of the content of nano-spherical silica particles and diatomaceous earth microcapsules. However, in experimental group 3, the time increases slightly (13 min), which is likely due to the significant decrease in tetrafluoroethylene content. This indicates that tetrafluoroethylene plays an important role in effectively expelling bubbles, while nano-spherical silica particles and diatomaceous earth microcapsules also help reduce the bubble content. Meanwhile, the peel strength retention rate increased after peel strength and weathering resistance tests, indicating that nano-spherical silica microparticles can significantly improve the cohesiveness, heat resistance, and creep resistance of the colloid. This is because, combining test groups 2 and 3, the diatomaceous earth-coated microcapsules remained unchanged, while the tetrafluoroethylene content decreased. It should be noted that the above test data are average values, not specific values, and are only used to illustrate the test results.

[0038] In application, the vehicle sticker from Example 1 was used for advertising on the side of an entire bus. During installation, two workers worked together, and even when facing complex contours such as the area around the doors and windows, they could clearly observe the air flowing quickly towards the edges and being expelled along the air channels. The entire large-area installation process was smooth, completed in one go, with no air bubbles remaining, and the image was as smooth as if it had been spray-painted. The installation time was reduced by approximately 30% compared to expectations. Example

[0039] Based on Example 1, Example 2 is presented here.

[0040] By mass fraction, the pressure-sensitive adhesive also contains 0.5-0.8% fumed silica and 0.1-0.3% diluent, wherein (tetrafluoroethylene + fumed silica) / diluent = 5-20.

[0041] In this Example 1, the following three sets of experiments were designed with variables for the three components: tetrafluoroethylene, fumed silica, and diluent: See Figure 4 Experimental group A: 1.0% tetrafluoroethylene, 0.5% fumed silica, 0.3% diluent; Experimental Group B: 1.1% tetrafluoroethylene, 0.6% fumed silica, 0.2% diluent; Experimental group C: 1.2% tetrafluoroethylene, 0.8% fumed silica, 0.1% diluent; Other components in the air guide groove adhesive layer 2 were set to minimum values, such as 0.5% nano-spherical silica particles, 0.5% microcapsules coated with diatomaceous earth, and 1.0% for the defoamer to illustrate its role; the remainder was pressure-sensitive adhesive. Table 2 shows the test performance of the car sticker in each test group.

[0042] Table 2 shows the test performance of the car stickers in each test group. experimental group Time required for the surface to be flat and free of air bubbles Number of bubbles Peel strength test / 25mm Peel strength retention rate after weathering test Experimental group A 13min none 8.9N 87% Experimental group B 9min none 9.3 89% Experimental group C 8min none 9.2 89% Combining the above test group AC, as the content of tetrafluoroethylene and fumed silica increases, the time required for the adhesive to be flat without bubbles gradually decreases, and the rate of decrease is also smaller. The peel strength retention rate after peel strength and weather resistance tests is increasing, but the upward trend is decreasing. This indicates that tetrafluoroethylene and fumed silica play an important role in reducing bubbles and improving strength. At the same time, due to the reduction of diluent, the increase in the above performance parameters is also reduced. That is, after the adhesive becomes thinner, the internal resistance of the bubbles decreases, making it easier for them to rise to the surface and break. This shows that the diluent has a positive linkage effect with tetrafluoroethylene and fumed silica, resulting in a comprehensive technical effect.

[0043] In conjunction with Examples 1 and 2, it should be noted that: The bubble test involves having the same operator attach a 300mm*300mm sample to a car fender model with the same curvature, recording the time required for it to be completely flat without bubbles and the final number of bubbles.

[0044] The peel strength test was conducted according to GB / T 2792-2014 standard, measuring the 180° peel strength (stainless steel plate, 24 hours after bonding).

[0045] The weather resistance test involves aging the car sticker under a xenon lamp for 72 hours (equivalent to about 6 months of outdoor exposure) to check for any peeling, detachment, or loss of peel strength.

[0046] It should be noted that the data in Example 2 are generally better than those in Example 1. The increase in the content of defoamer is also an important factor, which reduces the viscosity and makes the bubbles easier to float. This will not be described in detail here.

[0047] Finally, referring to test group 1 in Example 1 and test group A in Example 2, see Figure 3 and Figure 4 ,visible Figure 3 The central area has virtually no bubbles, but some small areas still have a small number of bubbles rising. Figure 4 There are virtually no air bubbles in the entire area, and the flatness fits extremely well, which matches the test data. Example

[0048] The method includes the following steps: Step S1: Preparation of release paper 3 with 3D microstructure pattern: Select base paper, process the designed concave and convex 3D microstructure pattern on one side through laser engraving, chemical etching or precision embossing process, then coat the surface with release agent, and obtain patterned release paper 3 after curing. Step S2: Prepare modified pressure-sensitive adhesive by quantitatively adding nano-spherical silica particles, microcapsules coated with diatomaceous earth, tetrafluoroethylene, defoamer, fumed silica, and diluent to the pressure-sensitive adhesive to obtain the modified pressure-sensitive adhesive. Step S3: The prepared pressure-sensitive adhesive solution is evenly applied to the surface of the patterned release paper 3 with its 3D microstructure pattern using slot coating or roller coating. While the adhesive solution is not fully cured (in a semi-cured or plastic state), it is pressed by a pair of precision rollers to fully imprint the pattern of the release paper 3 into the adhesive layer, forming an adhesive surface layer with a complementary air-guiding groove structure. Subsequently, it is heated in an oven tunnel to fully cure the adhesive layer, forming the air-guiding groove adhesive surface layer 2. Step S4: Dry-laminate or hot-press the functional layer 1 film (such as PVC film) with the air guide groove adhesive layer 2 that has been cured in step S2 through a composite roller to make the two firmly bonded. Step S5: Cure the composite material at room temperature or slightly above room temperature for 24-48 hours, and then cut it into rolls of predetermined width and length according to requirements.

[0049] This invention provides the application of the above-mentioned vehicle sticker with air guide groove in the fields of advertising, vehicle body decoration, glass window tinting, and surface decoration and protection of electronic products.

[0050] Because the car sticker of this invention has excellent bubble removal performance during construction, it is particularly suitable for application scenarios with large size, high flatness requirements, and curved surfaces (such as the curved surface of a car body).

[0051] In this embodiment 3, a car sticker with air channels comprises, from the outside in: a 100μm thick white PVC functional layer 1, a 28μm thick acrylic pressure-sensitive adhesive surface layer 2 with air channels, and a layer with a basis weight of 80g / 2 3. Glassine patterned release paper.

[0052] The surface of the patterned release paper 3 is laser-engraved to form a 3D microstructure pattern combining wave-shaped and dot matrix patterns. Correspondingly, a complementary air-guiding structure is embossed on the air-guiding groove adhesive layer 2. This structure consists of raised air-guiding grooves with a height of about 18 μm and recessed air-guiding grooves with a depth of about 10 μm, forming a mesh channel that extends to all four edges of the adhesive layer.

[0053] The specific preparation method in Example 3 is as follows: Step S1: Laser engrave a preset pattern on glassine paper, apply silicone release agent, and cure to obtain patterned release paper 3; Step S2: Dissolve the acrylic pressure-sensitive adhesive liquid (solid content approximately 50%) at a rate of 25 g / m³. 2 The wet adhesive is applied to the patterned surface of the patterned release paper 3 and pre-baked at 90°C for 30 seconds to allow the adhesive to reach a semi-cured state.

[0054] Step S3: Immediately pass the material through a pair of silicone rollers with a surface hardness of Shore A85 and a linear pressure of 50 N / cm for pressing and imprinting. Step S4: Then, it is thoroughly cured in a 120°C oven for 90 seconds to form the air guide groove adhesive layer 2; Step S5: The PVC functional layer 1 (pre-corona treated) and the air guide groove adhesive layer 2 are hot-pressed together at a pressure of 0.4 MPa and a temperature of 60°C. Step S6: After curing at 25℃ for 36 hours, cut and roll up; The process parameters in Example 3 are applicable to Examples 1 and 2, and this is hereby stated.

[0055] Comparative Example 1 The car stickers prepared in test group 1 of Example 1, commercially available ordinary car stickers (Comparative Example 1), and a breathable microporous structure car sticker (Comparative Example 2) were compared and tested.

[0056] Bubble test: Record the time required for complete flattening without bubbles and the final number of bubbles. Results: In Example 1, the sample in test group 1 had the shortest time (approximately 17 minutes); Comparative Example 1 produced multiple bubbles, while Comparative Example 2 had no bubbles but took a longer time (approximately 19 minutes).

[0057] Peel strength test: Example 1 was 8.5 N / 25 mm, Comparative Example 1 was 7.9 N / 25 mm, and Comparative Example 2 was 6.2 N / 25 mm, indicating that the present invention maintains excellent adhesion performance while ensuring efficient air venting.

[0058] Weather resistance test: After 72 hours of xenon lamp aging (equivalent to about 6 months of outdoor exposure), the sticker in Example 1 showed no peeling or falling off, and the peel strength retention rate was over 85%, which was significantly better than the two comparative examples.

[0059] It should be noted that in the above embodiments and comparative examples, in order to reduce the experimental cost, the components not described in detail are all taken as the minimum range, or can be implemented by adapting the existing technology in combination with the conventional understanding of those skilled in the art, and will not be described in detail here.

[0060] The technical features of this invention not described can be implemented by or using existing technology, and will not be repeated here. Of course, the above description is not a limitation of this invention, and this invention is not limited to the examples above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this invention should also be within the protection scope of this invention.

Claims

1. A car sticker with air guide grooves, characterized in that, The product includes a functional layer (1), an air guide groove adhesive layer (2), and a release paper (3) stacked in sequence. The release paper (3) has a 3D microstructure pattern with concave and convex on the side facing the air guide groove adhesive layer (2). The air guide groove adhesive layer (2) is provided with a slit-shaped air guide groove. The slit-shaped air guide groove and the 3D microstructure pattern are matched and imprinted to each other and extend to the edge of the air guide groove adhesive layer (2).

2. A car sticker with an air guide groove according to claim 1, characterized in that, The slit-shaped air guide groove includes a raised air guide groove and / or a recessed air guide groove. The raised height of the raised air guide groove is 10-25μm, and the recessed depth of the recessed air guide groove is 5-15μm. The thickness of the adhesive layer (2) of the air guide groove is 20-40μm.

3. A car sticker with an air guide groove according to claim 2, characterized in that, The cross-sectional shape of the slit-shaped air guide groove is one or more combinations of trapezoidal, arc-shaped, or wavy.

4. A car sticker with an air guide groove according to claim 1, characterized in that, By mass fraction, the pressure-sensitive adhesive used in the air guide groove adhesive layer (2) contains 0.5%-2% nano-spherical silica particles, 0.5%-1% microcapsules coated with diatomaceous earth, 1%-1.5% tetrafluoroethylene, and 0.5%-1% defoamer. The particle size of the nano-spherical silica, the microcapsule, and the tetrafluoroethylene is less than half the depth of the recessed gas guide groove.

5. A car sticker with an air guide groove according to claim 4, characterized in that, By mass fraction, (nanospherical silica particles + microcapsules) / tetrafluoroethylene = 1-3.

6. A car sticker with an air guide groove according to claim 4, characterized in that, The pressure-sensitive adhesive also contains 0.5-0.8% fumed silica and 0.1-0.3% diluent by mass fraction, wherein (tetrafluoroethylene + fumed silica) / diluent = 5-20.

7. A car sticker with an air guide groove according to claim 4, characterized in that, By mass fraction, the functional layer (1) is any one of PVC layer, PET layer, and PP layer; The release paper (3) is any one of glassine release paper, kraft paper release paper, or PET release paper; The defoamer is any one of polyether defoamers, mineral oil defoamers, polyether-modified polysiloxanes, acrylic copolymers, and polyether-modified organosilicones.

8. A method for preparing a vehicle sticker with an air guide groove as described in any one of claims 1-7, characterized in that, Includes the following steps: Step S1: Use a roller pressing method to process a 3D microstructure pattern with concave and convex shapes on one side of the base paper, then apply a release agent and cure it to form a patterned release paper (3). Step S2: Prepare modified pressure-sensitive adhesive by quantitatively adding nano-spherical silica particles, microcapsules coated with diatomaceous earth, tetrafluoroethylene, defoamer, fumed silica, and diluent to the pressure-sensitive adhesive to obtain the modified pressure-sensitive adhesive. Step S3: Apply pressure-sensitive adhesive liquid to the surface of the patterned release paper (3) with 3D microstructure pattern, and roll press and imprint before the adhesive liquid is completely cured, so that the pattern is imprinted into the adhesive layer to form an air guide groove structure, and then cure to form an air guide groove adhesive surface layer (2). Step S4: Composite the thin film of the functional layer (1) with the adhesive layer (2) of the air guide groove; Step S5: Finally, proceed with the ripening and slicing process.

9. A method for preparing a car sticker with an air guide groove according to claim 8, characterized in that, In steps S1 and S3, the linear pressure of the pressure roller during the pressing and stamping process is 20-35 N / cm.

10. An application of a vehicle sticker with air guide grooves as described in any one of claims 1-7, characterized in that, The vehicle stickers are used in advertising, vehicle body decoration, window tinting, and surface decoration or protection of electronic products.

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