A foam tape and a composite tape

Abstract

The present disclosure provides a foam tape and a composite tape. The present disclosure relates to the technical field of tapes. A foam tape includes a mesh release film, an adhesive layer, a printing layer, a high surface energy ink layer, and a foam layer that are sequentially stacked from bottom to top; wherein, the high surface energy ink layer is prepared from the following raw materials in parts by weight: 100 parts of a first ink and 5 to 10 parts of a first curing agent. For the foam tape provided in this application, a high surface energy ink is coated on the contact surface between the printing layer and the foam layer to form a high surface energy ink layer, and then the foam layer is stacked on the high surface energy ink layer. The high surface energy ink changes the surface properties of the printing layer and improves the adhesion performance with the foam layer. The high surface energy ink layer can improve the wetting effect between the foam layer and the printing layer, achieve the purpose of repeatedly bonding with the foam layer, and solve the problem of delamination between the foam surface of the foam layer and the printing layer.

Description

Technical Field

[0001] The present disclosure relates to the technical field of tapes, and particularly to a foam tape and a composite tape. Background Art

[0002] The foam tape generally includes a release film, a pressure-sensitive adhesive layer, a PET printing layer, and a foam layer. The foam tape is widely used in the fields of electronic devices, automotive parts, building caulking, etc. At present, the foam layer of the foam tape on the market is prepared by a supercritical process, and carbon dioxide is injected into the foam layer for foaming, which will form an open-cell foam. However, the foam layer formed by this process is relatively easy to absorb water and the roughness is difficult to control, which makes it easy to appear delamination between the foam layer and the PET printing layer. In addition, the foam layer of the existing foam tape on the market has slight adhesion, and the mother roll will show a reverse peeling state after long-term storage, resulting in product abnormalities. Moreover, for example, when the foam tape is applied in the field of electronic devices, it is often necessary to attach a functional layer (such as a copper foil tape, an aluminum tape, or a ceramic tape) to the surface of the foam layer to achieve a specific effect. However, taking the copper foil tape as an example, we found that the bonding effect of the foam layer of the foam tape is not good, and it is easy to appear delamination between the foam layer and the copper foil tape; and due to the large surface roughness of the foam layer, it will cause serious orange peel pattern after attaching the copper foil tape.

[0003] In addition, the current preparation method of the grid release film generally includes melting PE particles first, then coating the film on the surface of the substrate, embossing, and cooling to form a grid layer on the surface of the substrate, and then coating a release agent on the surface of the grid layer to form a release layer on the grid layer. Another example is a embossed release film disclosed in Chinese Patent Application (CN106273956A), which includes a substrate layer, a coated film layer, and a release layer; the coated film layer is provided on the substrate layer, and the surface of the coated film layer is formed with a texture; the release layer is provided on the coated film layer and is matched and attached to the texture; the coated film layer is a polyethylene layer or a polypropylene layer. However, the grid layer / coated film layer prepared from PE material (the maximum heat resistance is 90 °C) is not resistant to high temperature. Since the general drying temperature of the adhesive required to form the pressure-sensitive adhesive layer is above 100 °C, when the adhesive is coated on the release layer and dried, it will cause the grid embossing on the surface of the release film to deform, resulting in uneven depths of the grid-shaped exhaust grooves formed on the pressure-sensitive adhesive and unstable exhaust effect.

[0004] In addition, the grid layer structure of the current grid release film is generally a quadrilateral grid structure, and the corresponding exhaust grooves formed on the pressure-sensitive adhesive are quadrilateral exhaust grooves. However, we found that when the pressure-sensitive adhesive is actually attached to the surface of the object to be attached, the bubbles in the exhaust grooves cannot be discharged and the exhaust grooves cannot disappear within the preset time, which not only affects the production rhythm, but also affects the appearance and performance of the object to be attached, and also requires additional equipment to eliminate the bubbles, which undoubtedly increases the production cost and production efficiency. Summary of the Invention

[0005] The present disclosure provides a foam tape and a composite tape to solve at least one of the technical problems existing in the prior art.

[0006] According to the first aspect of the present disclosure, a foam tape is provided, which includes a mesh release film, an adhesive layer, a printing layer, a high surface energy ink layer, and a foam layer that are stacked in sequence from bottom to top; wherein, the high surface energy ink layer is prepared from the following raw materials in parts by weight: 100 parts of a first ink and 5 - 10 parts of a first curing agent.

[0007] Preferably, the solid content of the first ink is 28.5 ± 1%, the viscosity is 20 - 30 seconds, the surface tension is 68 dyne, and the main component is polyurethane resin; the first curing agent is an isocyanate curing agent.

[0008] Preferably, the foam layer is prepared from the following raw materials in parts by weight: 100 parts of an acrylic slurry and 1 - 3 parts of elastic particles, wherein the particle size of the elastic particles is 30 - 50 μm; or, the foam layer is prepared from the following raw materials in parts by weight: 100 parts of an acrylic slurry and 1 - 2 parts of elastic particles, wherein the particle size of the elastic particles is 30 - 70 μm.

[0009] Preferably, the solid content of the acrylic slurry is 40% - 60%, the density of the acrylic slurry is 0.75 ± 0.1 g / cm 3 , the storage modulus is 500 - 1000 KPa, the glass transition temperature TG is 0 - 20 °C, the creep recovery rate at 25 °C is 80 - 100%, and the main component of the acrylic slurry is polyacrylate; the elastic particles are one or more of glass microspheres, acrylonitrile microspheres, and polyborosiloxane microspheres.

[0010] Preferably, the mesh release film includes a substrate layer, a resin mesh layer, and a release layer that are stacked in sequence from bottom to top; a mesh structure is formed on one side of the resin mesh layer in contact with the release layer, and the mesh structure is composed of a plurality of hexagonal meshes connected to each other; the groove ridges formed between adjacent hexagonal meshes converge at the vertex positions of the hexagonal meshes to form a node structure, and the diameter of the circumscribed circle of the node structure is 15 - 30 μm.

[0011] Preferably, the depth of the groove ridges is 5 - 10 μm, and the width of the groove ridges is 19 - 25 μm.

[0012] Preferably, the resin mesh layer is configured to be non-deformable at least at 100 °C, and the resin mesh layer is formed by photocuring of a UV resin solution; the UV resin solution comprises raw materials in the following weight parts: 100 parts of UV glue, 3-12 parts of UV crosslinking agent, and 3-4 parts of UV initiator; wherein, the UV crosslinking agent is one or a mixture of a difunctional UV crosslinking agent, a trifunctional UV crosslinking agent, and a tetrafunctional UV crosslinking agent.

[0013] Preferably, the foam tape further comprises an anti-sticking coating, and the anti-sticking coating is formed by coating on the surface of the foam layer facing away from the mesh release film.

[0014] Preferably, the anti-sticking coating is prepared from raw materials in the following weight parts: 100 parts of second ink and 5 parts of second curing agent.

[0015] Preferably, the thickness of the anti-sticking coating is 4.5-13.5 μm; the solid content of the second ink is 31±2%, the viscosity is 10-14 seconds, the surface tension is 58 dyne, and the main component is polyurethane resin; the second curing agent is an isocyanate curing agent.

[0016] According to the second aspect of the present disclosure, the present invention provides a composite tape, the foam tape further comprises a functional layer, and the functional layer is laminated on the surface of the anti-sticking coating facing away from the foam layer.

[0017] Compared with the prior art, the advantages of the present application are as follows: 1), for the foam tape provided by the present application, a high surface energy ink is coated on the contact surface between the printing layer and the foam layer to form a high surface energy ink layer, and then the foam layer is laminated on the high surface energy ink layer. The high surface energy ink changes the surface properties of the printing layer and improves the adhesion performance with the foam layer. The high surface energy ink layer can improve the wetting effect between the foam layer and the printing layer, achieve the purpose of repeatedly bonding with the foam layer, and solve the problem of delamination between the foam layer and the printing layer. 2), in the foam tape of the present application, the foam layer is formed by mixing high modulus acrylic slurry and elastic particles in a certain proportion and then coating the mixture on the surface of the high surface energy ink layer facing away from the pressure sensitive adhesive layer. The high modulus acrylic slurry forms a support framework after coating, and the elastic particles are filled therein to play a role in alleviating the impact force. When the foam layer is subjected to a point impact force, first, the foam layer will deform and absorb a part of the impact force, and the elastic particles therein will also be compressed and deformed to absorb another part of the impact force, thereby reducing the impact force transmitted to the functional layer under the foam layer. Thus, the foam layer prepared from high modulus acrylic slurry and elastic particles can improve the impact resistance of the foam tape. When the foam tape is used for bonding to an electronic device, such as bonding to the screen of an electronic device, it can avoid the impact of external impact forces on the screen. 3), the pressure grooves and ridges on the grid structure of the grid release film of the present application can form corresponding grid-shaped hexagonal exhaust grooves on the surface of the pressure sensitive adhesive layer. These exhaust grooves also converge at the top corners of the hexagon to form exhaust nodes, so that after the grid release film is peeled off from the pressure sensitive adhesive layer, the overall pressure sensitive adhesive layer has grid-shaped exhaust grooves, enabling the pressure sensitive adhesive layer to quickly discharge the bubbles in the exhaust grooves when bonding to the item to be pasted and the exhaust grooves to disappear within a preset time. 4), the resin grid layer of the present application is formed by photocuring of UV resin liquid, making the resin grid layer resistant to high temperatures. Therefore, when a pressure sensitive adhesive is coated on the release layer surface of the grid release film and dried to form a pressure sensitive adhesive layer, it can ensure that the entire grid release film does not deform and the grid structure does not deform, thereby ensuring that the depth of the exhaust grooves formed on the surface of the pressure sensitive adhesive layer is consistent, and ensuring the exhaust stability and disappearability of the exhaust grooves. 5), the present application coats an anti-sticking coating with high filling property and high surface energy on the surface of the foam layer, filling the uneven surfaces of the foam layer, thereby improving the roughness of the foam layer, enhancing the product appearance, and significantly enhancing the bonding strength with the copper foil tape due to the increase in surface energy, solving the delamination problem caused by the low bonding strength between the copper foil tape and the foam layer on the market. And due to the presence of the anti-sticking coating, the problem of high roughness of the foam layer is solved, and after the copper foil tape is laminated on the anti-sticking coating, no orange peel phenomenon will occur. In addition, since the anti-sticking coating has no adhesiveness, the foam tape master roll can be stored for a long time without the problem of reverse adhesion during long-term storage of the master roll.

[0018] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present disclosure, nor is it used to limit the scope of the present disclosure. Other features of the present disclosure will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] By referring to the drawings and reading the following detailed description, the above and other objects, features, and advantages of the exemplary embodiments of the present disclosure will become readily understandable. In the drawings, several embodiments of the present disclosure are shown in an exemplary but non-limiting manner, wherein:

[0020] In the drawings, the same or corresponding reference numerals represent the same or corresponding parts.

[0021] Figure 1 A schematic structural diagram of the foam tape according to an embodiment of the present disclosure is shown;

[0022] Figure 2 A schematic diagram of the impact force transmission direction of the foam layer and the foam layer when subjected to a point impact force according to an embodiment of the present disclosure is shown (wherein, Figure 2 (a) is a schematic diagram of the foam layer, Figure 2 (b) is a schematic diagram of the impact force transmission direction when the foam layer is subjected to a point impact force);

[0023] Figure 3 A schematic structural diagram of the grid release film and the pressure-sensitive adhesive layer according to an embodiment of the present disclosure is shown;

[0024] Figure 4 A top view of the grid release film according to an embodiment of the present disclosure under a microscope is shown;

[0025] Figure 5 A schematic diagram of the node structure formed by the intersection of the pressure grooves and ridges of the grid structure according to an embodiment of the present disclosure is shown;

[0026] Figure 6 A schematic layout diagram of the grid structure composed of hexagonal grids and the grid structure composed of quadrilateral grids according to an embodiment of the present disclosure is shown;

[0027] Figure 7 The node structure formed by the intersection of the pressure grooves and ridges in the first case according to an embodiment of the present disclosure is shown;

[0028] Figure 8 The node structure formed by the intersection of the pressure grooves and ridges in the second case according to an embodiment of the present disclosure is shown;

[0029] Figure 9 The node structure formed by the intersection of the pressure grooves and ridges in the third case according to an embodiment of the present disclosure is shown;

[0030] Figure 10The structural schematic diagram of the composite tape according to an embodiment of the present disclosure is shown.

[0031] Reference numerals in the drawings: 1 - grid release film, 2 - adhesive layer, 3 - printing layer, 4 - high surface energy ink layer, 5 - foam layer, 6 - anti - sticking coating, 7 - functional layer, 11 - substrate layer, 12 - resin grid layer, 13 - grid structure, 14 - release layer, 121 - first planar adhesive layer, 131 - hexagonal grid, 132 - pressing groove rib, 133 - node structure, 22 - micro - structure adhesive layer, 21 - second planar adhesive layer, 221 - exhaust groove. Detailed implementation manners

[0032] To make the objectives, features, and advantages of the present disclosure more obvious and understandable, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present disclosure.

[0033] According to an embodiment of the present disclosure, as Figures 1-5 shown, the present invention provides a foam tape, which includes a grid release film 1, an adhesive layer 2, a printing layer 3, and a foam layer 5 that are sequentially stacked from bottom to top. Among them, a high surface energy ink layer 4 is provided between the printing layer 3 and the foam layer 5. The high surface energy ink layer 4 is prepared from the following raw materials in parts by weight: 100 parts of first ink and 5 - 10 parts of first curing agent.

[0034] For the foam tape provided in the present application, a high surface energy ink is coated on the contact surface between the printing layer 3 and the foam layer 5 to form a high surface energy ink layer 4. Then, the foam layer is stacked on the high surface energy ink layer 4. The setting of the high surface energy ink layer 4 changes the surface performance of the printing layer 3 and improves the adhesion performance with the foam layer. The high surface energy ink layer 4 can improve the wetting effect between the foam layer 5 and the printing layer 3, achieve the purpose of repeatedly bonding with the foam layer, and solve the problem of delamination between the foam layer and the printing layer.

[0035] For example, in the present application, the thickness of the adhesive layer 2 is generally 20 - 40 μm, the thickness of the printing layer 3 is 2 - 12 μm, the thickness of the high surface energy ink layer 4 is 1 - 4 μm, and the thickness of the foam layer 5 is 50 - 200 μm.

[0036] For example, the adhesive layer 2 is a pressure - sensitive adhesive layer 2. Exemplarily, the pressure - sensitive adhesive layer is an acrylic pressure - sensitive adhesive layer.

[0037] For example, the printing layer 3 is a PET printed black film (i.e., a printed film), and the material of the printing layer 3 includes but is not limited to PET material.

[0038] For example, the high surface energy ink layer 4 has an ultra-high surface energy, and the surface tension of the high surface energy ink layer 4 is ≥56 dyne (i.e., dyne / cm). More preferably, the surface tension of the high surface energy ink layer 4 is ≥60 dyne / cm. Exemplarily, the surface tension of the high surface energy ink layer 4 is between 56 and 62 dyne. It has good adhesion to the low surface energy surface (30 - 38 dyne) and will not fall off.

[0039] For example, the solid content of the first ink is 28.5 ± 1%, the viscosity is 20 - 30 seconds, the surface tension is 68 dyne, and the main component is polyurethane resin.

[0040] The first curing agent is isocyanate curing. Exemplarily, the isocyanate curing agent is an aliphatic isocyanate curing agent, and the aliphatic isocyanate curing agent includes but is not limited to at least one of isophorone diisocyanate and hexamethylene diisocyanate.

[0041] Preferably, the color of the first ink is black, the solid content of the first ink is 28.5 ± 1%, the viscosity of the first ink is 20 - 30 seconds, the surface tension of the first ink is 68 dyne, the halogen in the first ink is ≤100 ppm, the adhesion of the first ink (cross-cut method) is 4B, and the main component of the first ink is polyurethane resin. Correspondingly, the first curing agent is hexamethylene diisocyanate.

[0042] In some embodiments, the foam layer 5 is prepared from the following raw materials by weight: 100 parts of acrylic paste with high modulus and 1 - 3 parts of elastic particles, where the particle size of the elastic particles is 30 - 50 μm. Or, the foam layer 5 is prepared from the following raw materials by weight: 100 parts of acrylic paste with high modulus and 1 - 2 parts of elastic particles, where the particle size of the elastic particles is 30 - 70 μm.

[0043] Among them, the acrylic paste is a high modulus acrylic paste, and the high modulus acrylic paste needs to meet the following characteristics: the solid content of the acrylic paste is 40% - 60%, the density of the acrylic paste is 0.75 ± 0.1 g / cm 3 , the storage modulus is 500 - 1000 KPa, the TG (glass transition temperature) is 0 - 20 °C, the creep recovery rate at 25 °C is 80 - 100%, and the main component of the acrylic paste is polyacrylate.

[0044] Preferably, the color of the acrylic paste is black or dark blue, the solid content of the acrylic paste is 50 ± 2%, the density of the acrylic paste is 0.75 ± 0.025 g / cm 3 , the storage modulus is 710 KPa, the TG (glass transition temperature) is 10 °C, the creep recovery rate at 25 °C is 85.4%, and the main component of the acrylic paste is polyacrylate.

[0045] More preferably, the foam layer 5 prepared from the acrylic paste and the elastic particles has a compression rebound force (CFD) of 150 - 250 KPa when measured at a thickness of 10 mm and a compression ratio of 25%; the density of the prepared foam layer 5 is 0.6 ± 0.05 g / cm 3 .

[0046] Among them, in order to better screen out the elastic particles, before compounding with the acrylic paste, we adopt the mode of first foaming and then screening the elastic particles, which can effectively avoid the problem of incomplete foaming of the elastic particles and resulting in fluctuations in the impact resistance performance of the product.

[0047] For example, the elastic particles are foamed microspheres, and the elastic particles can be one or more of glass microspheres, acrylonitrile microspheres, and polyborosiloxane microspheres.

[0048] In this embodiment, the foam layer 5 is formed by mixing a high-modulus acrylic paste and elastic particles in a certain proportion and then coating it on the surface of the high-surface-energy ink layer 4 facing away from the pressure-sensitive adhesive layer / printing layer. The high-modulus acrylic paste forms a support framework after coating, and the elastic particles are filled therein to play a role in alleviating the impact force, as Figure 2 (a), Figure 2 (b) shown. It can be compared to the foam layer and springs in a Simmons mattress. When the foam layer 5 is subjected to a point impact force, first, the foam layer 5 will deform and absorb part of the impact force, and the elastic particles inside it will also be compressed and deformed to absorb another part of the impact force, thereby reducing the impact force transmitted to the functional layer under the foam layer. Thus, the foam layer prepared from the high-modulus acrylic paste and the elastic particles can improve the impact resistance of the foam tape. When the foam tape is used for bonding to an electronic device, such as bonding to the screen of an electronic device, it can avoid the impact of external impact forces on the screen.

[0049] In some embodiments, as Figures 3-6 shown, the grid release film 1 includes a substrate layer 11, a resin grid layer 12, and a release layer 14 that are sequentially stacked from bottom to top; a grid structure 13 is formed on the side of the resin grid layer 12 in contact with the release layer. The grid structure 13 is composed of a plurality of uniformly arranged hexagonal grids 131 connected to each other. A groove rib 132 is formed between adjacent hexagonal grids, and the groove ribs 132 formed between adjacent hexagonal grids meet at the top corner positions of the hexagonal grids to form a node structure 133. The node structure is generally triangular in shape, the diameter of the circumscribed circle of the node structure is 15 - 30 μm, the depth of the groove rib is 5 - 10 μm, and the width of the groove rib is 19 - 25 μm.

[0050] Exemplarily, the depth of the grooved rib can be 5μm, 8μm, or 10μm. The width of the grooved rib can be 19μm, 22μm, or 25μm. The circumscribed circle diameter of the node structure can be 15μm, 20μm, 25μm, or 30μm. In the present application, the so-called "circumscribed circle of the node structure" is the circumscribed circle of the virtual triangle formed by the connecting lines between the apex angles of adjacent hexagons at the intersection position. That is, the circumscribed circle of the virtual triangle formed by the wide sides (in the width direction) of adjacent grooved ribs at the intersection position.

[0051] For example, as Figure 5 shown, the hexagonal grid in this embodiment can be a regular hexagon, and the side length of the hexagonal grid is 160 - 180um.

[0052] For example, the material of the base material layer 11 is one of PET, PI, BOPP, paper, and PEEK. The material of the release layer 14 is solvent-containing silicone oil or solvent-free silicone oil. The material of the resin grid layer 12 is a high-temperature resistant resin.

[0053] The thickness of the base material layer 11 is 25 - 188μm. The thickness of the resin grid layer 12 is 15 - 100μm. The thickness of the release layer 14 is 0.5 - 1μm.

[0054] We found that when the grid structure 13 is composed of a plurality of uniformly arranged hexagonal grids 131 connected to each other, the exhaust grooves formed on the surface of the pressure-sensitive adhesive layer 2 are hexagonal exhaust grooves accordingly. These hexagonal exhaust grooves are interconnected through exhaust nodes (when the node structure of the grid release film is transferred to the pressure-sensitive adhesive layer, exhaust nodes will be formed on the surface of the pressure-sensitive adhesive layer), thus forming a grid shape. Under the same conditions, the number of hexagonal exhaust grooves and exhaust nodes is more than that of the currently conventional quadrilateral exhaust grooves. The more the number of exhaust grooves and exhaust nodes, the better the exhaust effect. Therefore, the hexagonal exhaust grooves are superior to the quadrilateral exhaust grooves in terms of exhaust effect.

[0055] Thus, taking the grid structure 13 composed of the arrangement of hexagonal grids 131 in this embodiment as an example, compared with the grid structure composed of the arrangement of quadrilateral grids that is currently on the market, as Figure 6As shown in the figure, the grid-like hexagonal exhaust grooves and grid-like quadrilateral exhaust grooves formed by transferring them to the surface of the pressure-sensitive adhesive layer 2 are analyzed respectively. We select hexagonal exhaust grooves and quadrilateral exhaust grooves with the same conditions and the same area for arrangement, and the results show that the law of increasing exhaust nodes is (the number and exhaust node law of the quadrilateral exhaust grooves and hexagonal exhaust grooves shown in Table 1): 1) When the number of quadrilateral exhaust grooves increases to an odd number, one exhaust node is added. When the number of quadrilateral exhaust grooves increases to an even number, two exhaust nodes are added. 2) As long as the number of hexagonal exhaust grooves increases by one, the corresponding exhaust nodes will increase by two. Therefore, for the grid release film, a polygon needs to be selected, and the following two points need to be achieved: First, it can be densely arranged without blank areas, and the exhaust grooves form a continuous channel without breakpoints. Second, the number of exhaust grooves and exhaust nodes should be as many as possible. Therefore, the hexagonal exhaust groove is the best choice to meet these two points. Correspondingly, on the grid release film, the grid units forming the grid structure are best selected as hexagonal grids.

[0056] Table 1 Law of the number and exhaust nodes of the existing conventional quadrilateral exhaust grooves and the hexagonal exhaust grooves of the present application

[0057]

[0058] Specifically, one side of the resin grid layer 12 in contact with the release layer 14 is a grid-shaped grid structure 13, and the grid structure 13 is composed of a plurality of evenly arranged hexagonal grids 131 connected to each other. Substantially, these hexagonal grids 131 are arranged and connected in the shape order of a hexagon by the groove ribs 132, so that adjacent hexagonal grids share a groove rib, as Figure 4 shown. The groove ribs 132 between adjacent hexagonal grids meet at the vertex positions of the hexagon to form a node structure 133, and these groove ribs 132 are connected to each other through the node structure. Thus, when the pressure-sensitive adhesive layer is stacked on the surface of the grid release film 1, these groove ribs 132 on the grid structure can form corresponding grid-like hexagonal exhaust grooves 221 on the surface of the pressure-sensitive adhesive layer 2. These exhaust grooves also meet at the vertex positions of the hexagon to form exhaust nodes, so that after the grid release film is peeled off from the pressure-sensitive adhesive layer, the whole pressure-sensitive adhesive layer has grid-like hexagonal exhaust grooves, so that when the pressure-sensitive adhesive layer is attached to the item to be pasted, the air bubbles in the exhaust grooves can be quickly discharged and the exhaust grooves can disappear within a preset time.

[0059] In this application, the grid structure 13 on the grid release film is composed of hexagonal grids 131 connected to each other. We found that, compared with the conventional quadrilateral grid structure on the current release film, under the same conditions, the more sides the polygon grid has, the more exhaust nodes there are in the exhaust grooves formed on the surface of the pressure-sensitive adhesive, and the exhaust effect shows a positive correlation. Since the grid structure 13 is formed by transferring and coating the resin solution onto the surface of the substrate layer using a gravure roll, a pattern corresponding to the grid structure needs to be engraved on the gravure roll first. Considering the difficulty of implementing the pattern on the gravure roll, hexagonal grids are preferably used.

[0060] When the pressure-sensitive adhesive layer 2 is attached to the object to be adhered, most of the bubbles in the exhaust grooves gather at the exhaust node positions. At present, after the grid release film on the market is laminated with the pressure-sensitive adhesive layer, when the pressure-sensitive adhesive surface is actually attached to the object to be adhered, the bubbles in the exhaust grooves cannot be discharged and the exhaust grooves cannot disappear within the preset time. Through a large number of research experiments, we found that when the size of the node structure 133 (i.e., the diameter of the circumscribed circle of the node structure) on the grid structure 13 of the grid release film is limited within the range of 15 - 30 μm, it can cooperate with the width (19 - 25 μm) and depth (5 - 10 μm) of the pressure groove rib 132 to enable the bubbles in the exhaust groove 221 on the pressure-sensitive adhesive layer 2 to be quickly discharged, and the exhaust groove 221 can also disappear within the preset time.

[0061] Moreover, when the grid release film 1 is used in combination with the pressure-sensitive adhesive layer 2 to prepare the foam tape, a release layer 14 will be coated on the grid structure of the resin grid layer first to ensure that the grid release film 1 can be peeled off from the pressure-sensitive adhesive layer 2. The thickness of the release layer 14 is generally 0.5 - 1 μm, which can be ignored compared with the depth of the grid structure. Therefore, when the grid release film 1 composed of the substrate layer 11, the resin grid layer 12, and the release layer 14 is laminated with the pressure-sensitive adhesive layer 2, the size of the grid structure can be completely transferred to the pressure-sensitive adhesive layer 2, forming corresponding hexagonal exhaust grooves in a grid pattern on the surface of the pressure-sensitive adhesive layer 2. And the depth, width of the hexagonal exhaust grooves on the pressure-sensitive adhesive layer and the size of the exhaust nodes are equivalent to the depth, width of the pressure groove rib 132 of the grid structure 13 and the size of the node structure 133.

[0062] Among them, we also found through research that the exhaustibility and disappearability of the exhaust grooves 221 on the surface of the pressure-sensitive adhesive layer 2 are a set of paradoxes and are mutually contradictory. To ensure the exhaustibility of the exhaust grooves 221, it is necessary to increase the physical size of the exhaust grooves 221 (such as the depth and width of the exhaust grooves 221). However, the increase in the physical size of the exhaust grooves 221 multiplies the difficulty of the disappearability of the exhaust grooves 221, which also means that the disappearability of the exhaust grooves 221 cannot be achieved. On the other hand, to ensure the disappearability of the exhaust grooves 221, it is necessary to appropriately reduce the physical size of the exhaust grooves 221, such as reducing the width and depth of the exhaust grooves 221. However, the bubbles in the exhaust grooves 221 cannot be discharged smoothly. Therefore, it is necessary to find a balance between exhaustibility and disappearability to ensure that these two performances can be achieved simultaneously. In addition, since most of the bubbles in the exhaust grooves 221 gather at the exhaust node positions and are difficult to discharge, we found through a large number of orthogonal experiments that on the premise that the diameter of the circumscribed circle of the node structure 133 of the mesh release film 1 is 15-30 μm, when the depth of the pressing groove rib 132 on the mesh release film 1 is 5-10 μm and the width of the pressing groove rib 132 is 19-25 μm, it can make the exhaust grooves 221 transferred to the surface of the pressure-sensitive adhesive layer 2 quickly discharge the bubbles in both the channels of the exhaust grooves 221 and the exhaust nodes where the ends of the exhaust grooves 221 meet when adhering to the object to be pasted, and at the same time, the exhaust grooves are guaranteed to disappear within the preset time.

[0063] For example, as Figure 3 shown, the resin mesh layer 12 includes a mesh structure 13 and a first planar adhesive layer 121. The first planar adhesive layer 121 is disposed between the mesh structure 13 and the substrate layer 11. The mesh structure 13 is provided on the side of the first planar adhesive layer 121 facing away from the substrate layer 11, and the mesh structure 13 protrudes from the first planar adhesive layer 121. The pressure-sensitive adhesive layer 2 includes a microstructured adhesive layer 22 and a second planar adhesive layer 21. The second planar adhesive layer 21 is located between the microstructured adhesive layer 22 and the printing layer 3. The microstructured adhesive layer 22 engages with the mesh structure 13 and the release layer 14 thereon. Exhaust grooves 221 are formed on the microstructured adhesive layer 22. The shapes of these exhaust grooves 221 are hexagonal, and the hexagonal exhaust grooves 221 communicate with each other to form a grid. Thus, when a pressure-sensitive adhesive is coated on the release surface of the release layer 14 on the mesh structure to form the pressure-sensitive adhesive layer 2, these pressing groove ribs on the mesh structure are transferred to the surface of the pressure-sensitive adhesive layer, thereby forming grid-shaped exhaust grooves 221 on the surface of the pressure-sensitive adhesive layer 2.

[0064] For example, as Figure 5As shown, the ribbed grooves 132 between adjacent hexagonal meshes 131 meet at the apex positions of the hexagons to form a node structure 133. In this application, the node structure 133 formed by the intersection of adjacent ribbed grooves 132 can be arranged in any of the following ways, including but not limited to: the ribbed grooves 132 between three adjacent hexagonal meshes 131 meet at one of the apex positions of the hexagonal mesh to form a node structure 133, and the shape of this node structure is triangular. As Figure 7 shown. When the size of the node structure is slightly smaller, near the intersection point, the two side edges of the ribbed groove 132 gradually contract inward, and the shapes of the two side edges are generally convex arc shapes, so that the width of the ribbed groove gradually decreases, and thus the three ribbed grooves 132 intersect to form a node structure 133.

[0065] Or, it can also be, as Figure 8 shown. When the size of the node structure 133 is slightly larger, near the intersection point, the two side edges of the ribbed groove 132 gradually expand outward, and the shapes of the two side edges are generally concave arc shapes, so that the width of the ribbed groove 132 gradually increases, and thus the three ribbed grooves 132 intersect to form a node structure 133.

[0066] Or, it can also be, as Figure 9 shown. The width of the ribbed groove 132 does not change. The ribbed grooves 132 intersect to form a node structure 133.

[0067] In summary, near the position of the node structure 133, a transition section is formed between the ribbed groove 132 and the node structure 133. Towards the direction close to the node structure 133, the width of this transition section gradually decreases, or it can also be that the width of the transition section gradually increases, or it can also be that the width of the transition section remains unchanged.

[0068] The arrangement of the node structures formed by the intersection of the above ribbed grooves needs to be adjusted accordingly according to the width of the ribbed grooves and the size of the node structures.

[0069] Since the resin mesh layer is formed by gravure transfer using a gravure roll, corresponding texture patterns can be engraved on the surface of the gravure roll in advance, and the structure and shape of this texture pattern correspond to the mesh structure.

[0070] In some embodiments, the resin mesh layer 12 is configured to be able to maintain its shape without deformation at least at 100 °C. The resin mesh layer 12 is formed by photocuring of a UV resin solution. The UV resin solution includes the following raw materials in parts by weight: 100 parts of UV glue, 3 - 12 parts (phr) of UV crosslinking agent, and 3 - 4 parts of UV initiator; among them, the UV crosslinking agent is one or a mixture of a difunctional UV crosslinking agent, a trifunctional UV crosslinking agent, and a tetrafunctional UV crosslinking agent.

[0071] For example, epoxy-based UV adhesives can be used as the UV glue, and the selectable models include but are not limited to: Loctite EA3335, TSBD2640, Letuo 3523.

[0072] The UV initiator can initiate a polymerization reaction when the material is irradiated with ultraviolet light. Exemplarily, the UV initiator is one or a mixture of more than one of: 1-hydroxycyclohexyl phenyl ketone (PI-184), diphenyl-(2,4,6-trimethylbenzoyl) phosphine oxide (TPO), 2-isopropyl thioxanthone, isopropyl thioxanthone (ITX105).

[0073] Bifunctional UV crosslinking agents include but are not limited to: polyethylene glycol 400 diacrylate (PEG400DA), 1,6-hexanediol diacrylate (HDDA, also known as "1,6-hexanediol diacrylate"), polyurethane-modified diallyl oligomer (DOUBLEMER® 5222).

[0074] Trifunctional UV crosslinking agents include but are not limited to: trimethylolpropane tris[3-(2-methylaziridinyl) propionate] (TTMAP), trimethylolpropane triacrylate (TMPTA), pentaerythritol triacrylate (PETA).

[0075] Tetrafunctional UV crosslinking agents include but are not limited to pentaerythritol tetraallyl ether, tetrafunctional polyester acrylate (ETERCURE 6325-100).

[0076] In this embodiment, the resin mesh layer is formed by photocuring the UV resin liquid, so that the resin mesh layer is heat-resistant (the temperature remains unchanged at 90-150°C without deformation, and can even remain unchanged above 150°C). Therefore, when an adhesive (i.e., a pressure-sensitive adhesive) is coated on the release layer surface of the mesh release film and dried to form a pressure-sensitive adhesive layer, it can ensure that the entire mesh release film does not deform, ensure that the mesh structure does not deform, thereby ensuring that the depth of the exhaust grooves formed on the surface of the pressure-sensitive adhesive layer is consistent, and ensuring the exhaust stability and disappearability of the exhaust grooves.

[0077] For example, in this embodiment, the mesh release film is specifically prepared by the following method: including:

[0078] The UV resin liquid is transferred and coated onto the surface of the substrate layer by an anilox roll, and then UV pre-cured, so as to preliminarily form a resin mesh layer with a mesh structure on the surface of the substrate layer. The UV exposure amount during UV pre-curing is 500-2000 mj / cm 2 ;

[0079] The substrate layer with a resin mesh layer formed on its surface is subjected to UV secondary curing and molding; the UV exposure amount during UV secondary curing is 500~2000 mj / cm 2 ;

[0080] A release agent is coated on the surface of the mesh structure of the resin mesh layer to form a release layer.

[0081] In this embodiment, the UV resin liquid is dropped onto the anilox roll, and the anilox roll transfers and coats the UV resin liquid onto the surface of the substrate layer in a embossing form, and then UV primary curing is carried out. After UV primary curing, a resin mesh layer with a mesh structure is formed on the surface of the substrate layer, and then further UV secondary curing is carried out to form the resin mesh layer on the surface of the substrate layer, further ensuring a firm connection between the resin mesh layer and the substrate layer. It can be seen from this that the materials of the resin mesh layer and the mesh structure formed on one side thereof are not only the same, but they are formed on the surface of the substrate layer by one-step and integral photocuring. Then, a release agent (such as silicone oil) is coated on the surface of the mesh structure to form a release layer.

[0082] In this embodiment, the coating process has more advantages in controlling the size and appearance than the existing conventional casting process. The UV curing and embossing are faster and more thorough, and the depth and width data of the formed mesh structure are more stable.

[0083] In some embodiments, as Figure 1 shown, the foam tape of the present application further includes an anti-sticking coating 6, and the anti-sticking coating 6 is formed by coating on the surface of the foam layer 5 facing away from the mesh release film 1.

[0084] For example, the anti-sticking coating 6 is prepared from the following raw materials in parts by weight: 100 parts of the second ink and 5 parts of the second curing agent.

[0085] For example, the thickness of the anti-sticking coating 6 is 4.5~13.5 μm. Exemplarily, the thickness of the anti-sticking coating 6 is 4.5 μm, 5 μm, 7 μm, 9 μm, 11 μm, 13.5 μm. More preferably, the thickness of the anti-sticking coating 6 is 9 μm.

[0086] For example, the surface tension of the anti-sticking coating 6 ≥ 52 dyne / cm. The anti-sticking coating 6 has a strong adhesion effect and good filling property with the foam layer 5, and reduces the surface roughness of the foam layer 5.

[0087] For example, the solid content of the second ink is 31 ± 2%, the viscosity is 10~14 seconds, the surface tension is 58 dyne, and the main component is polyurethane resin.

[0088] The second curing agent is an isocyanate curing agent. The isocyanate curing agent includes but is not limited to: aliphatic isocyanate curing agents, and the aliphatic isocyanate curing agents include but are not limited to: isophorone diisocyanate, hexamethylene diisocyanate.

[0089] Preferably, the color of the second ink is black, the solid content of the second ink is 31±2%, the viscosity of the second ink is 10 - 14 seconds, the surface tension of the second ink is 58 dyne, the halogen in the second ink is ≤400 ppm, the adhesion of the second ink (cross-cut method) is 4B, and the main component of the second ink is polyurethane resin. Correspondingly, the second curing agent is hexamethylene diisocyanate.

[0090] After the second ink and the second curing agent are mixed and coated on the surface of the foam layer, the formed anti-sticking coating 6 has no stickiness on the surface, has a strong adhesion effect with the foam layer 5, and the formed anti-sticking coating 6 has good filling properties, can reduce the surface roughness of the foam layer 5, thereby further improving the adhesion between the foam layer 5 and the functional layer (such as the copper foil tape layer), and preventing delamination between the foam layer and the copper foil tape layer. And because the anti-sticking coating has no stickiness, the foam layer can be made non-sticky after coating, and the master roll of the foam tape can be stored for a long time without the problem of reverse sticking during long-term storage of the master roll.

[0091] In summary, in this embodiment, by coating an anti-sticking coating with high filling properties and high surface energy on the surface of the foam layer 5, the uneven surfaces of the foam layer 5 are filled, so that the roughness of the foam layer 5 is improved, the appearance of the product is enhanced, the surface of the product is smoother, and with the increase of surface energy, the bonding strength with the copper foil tape is significantly improved, solving the delamination problem caused by the low bonding strength between the copper foil tape on the market and the foam layer 5. And due to the presence of the anti-sticking coating 6, the problem of high roughness of the foam layer is solved, and after the copper foil tape layer is laminated on the anti-sticking coating, there will be no orange peel phenomenon.

[0092] In addition, because the anti-sticking coating 6 can make the foam layer non-sticky after being coated on the surface of the foam layer 5, the master roll of the foam tape can be stored for a long time without the problem of reverse sticking during long-term storage of the master roll.

[0093] According to the second aspect of the present disclosure, as Figure 10 shown, the present invention also provides a functional composite tape, including the above-mentioned foam tape, and further including a functional layer 7, and the functional layer 7 is laminated on the surface of the anti-sticking coating 6 facing away from the foam layer 5.

[0094] For example, the functional layer 7 can be a copper foil tape, an aluminum tape or a ceramic tape. Preferably, the functional layer 7 is a copper foil tape.

[0095] Taking copper foil tape as an example, a general copper foil tape has a copper foil layer and an acrylic adhesive layer. Therefore, when it is necessary to bond the copper foil tape to the foam tape, only need to bond the acrylic adhesive layer of the copper foil tape to the anti-sticking coating 6 of the foam tape, which can solve the copper foil orange peel phenomenon and avoid the delamination problem between the copper foil tape and the foam layer. And because there are elastic particles in the foam layer, it can ensure that the composite tape has good impact resistance. Among them, the material of the copper foil layer includes but is not limited to cast copper, alloy copper, and electrolytic copper.

[0096] The following further elaborates on the present application in conjunction with specific embodiments:

[0097] Example 1

[0098] 1): As Figure 1 shown, a foam tape includes a grid release film 1, a pressure-sensitive adhesive layer 2, a printing layer 3, a high surface energy ink layer 4, a foam layer 5, and an anti-sticking coating 6 that are stacked in sequence from bottom to top.

[0099] Among them, the grid release film 1 includes a base material layer 11, a resin grid layer 12, and a release layer 14 that are stacked in sequence from bottom to top. A grid structure 13 is formed on one side of the resin grid layer 12 that contacts the release layer 14.

[0100] The grid structure 13 is composed of a plurality of uniformly arranged hexagonal grids 131 connected to each other. There are pressure grooves and ridges 132 formed between adjacent hexagonal grids. The pressure grooves and ridges 132 between adjacent hexagonal grids converge at the top corner positions of the hexagonal grids to form a node structure 133. The shape of this node structure is triangular. The diameter of the circumscribed circle of the triangular node structure is 15 - 30 μm. The depth of the pressure groove and ridge 32 is 5 - 10 μm, and the width of the pressure groove and ridge 32 is 19 - 25 μm.

[0101] Among them, the material of the base material layer 11 is PET. The resin grid layer 12 is formed by photocuring of UV resin liquid. The UV resin liquid includes the following raw materials in parts by weight: 100 parts of UV glue, 10 parts of bifunctional UV crosslinking agent, and 3 parts of UV initiator. Among them, the bifunctional UV crosslinking agent is polyethylene glycol 400 diacrylate, and the UV initiator is 1-hydroxycyclohexyl phenyl ketone (PI-184).

[0102] Among them, the pressure-sensitive adhesive layer 2 is an acrylic pressure-sensitive adhesive layer with a thickness of 30 μm.

[0103] Among them, the high surface energy ink layer 4 is prepared from high surface energy ink A. High surface energy ink A includes the following raw materials in parts by weight: 100 parts of the first ink and 5 parts of the first curing agent. The thickness of the high surface energy ink layer 4 is 2 μm.

[0104] The color of the first ink is black, the solid content is 28.5 ± 1%, the viscosity is 20 - 30 seconds, the surface tension is 68 dyne, the halogen in the first ink is ≤ 100 ppm, the adhesion of the first ink (cross-cut method) is 4B, and the main component of the first ink is polyurethane resin. The first curing agent is hexamethylene diisocyanate.

[0105] The foam layer 5 is prepared from the following raw materials in parts by weight: 100 parts of high modulus acrylic paste and 1 part of elastic particles 1, and the particle size of the elastic particles 1 is 50 μm. The thickness of the foam layer 5 is 100 μm.

[0106] The color of the high modulus acrylic paste is black, the solid content of the acrylic paste is 50 ± 2%, the density of the acrylic paste is 0.75 ± 0.025 g / cm 3 , the storage modulus is 710 KPa, the TG (glass transition temperature) is 10 °C, the creep recovery rate at 25 °C is 85.4%, and the main component of the acrylic paste is polyacrylate. The elastic particles are glass microspheres.

[0107] The anti - sticking coating 6 is prepared from the following raw materials in parts by weight: 100 parts of the second ink and 5 parts of the second curing agent. The thickness of the anti - sticking coating 6 is 4.5 μm.

[0108] The color of the second ink is black, the solid content of the second ink is 31 ± 2%, the viscosity is 10 - 14 seconds, the surface tension is 58 dyne, the halogen in the second ink is ≤ 400 ppm, the adhesion of the second ink (cross - cut method) is 4B, and the main component of the second ink is polyurethane resin. The second curing agent is hexamethylene diisocyanate

[0109] II): A preparation method of a foam tape: includes the following steps:

[0110] Step 1: Preparation of the mesh release film 1: Specifically includes:

[0111] Step 1 - 1): Transfer and coat the UV resin liquid onto the surface of the substrate layer 11 through a gravure roll, and then perform UV pre - curing, thereby initially forming a resin mesh layer 12 with a mesh structure 13 on the surface of the substrate layer. The UV exposure amount during UV pre - curing is 500 mj / cm 2 ;

[0112] Step 1 - 2): Perform UV secondary curing and molding on the substrate layer with the resin mesh layer formed on its surface; the UV exposure amount during UV secondary curing is 500 mj / cm 2 ;

[0113] Step 1 - 3): Coat a release agent on the mesh structure surface of the resin mesh layer to form a release layer 14.

[0114] Step 2: Preparation of the pressure-sensitive adhesive layer 2: Coat a pressure-sensitive adhesive on the surface of the release layer facing away from the substrate layer and dry it, thereby forming a pressure-sensitive adhesive layer on the surface of the release layer.

[0115] Step 3: Preparation of the printing layer 3: Prepare the printing layer 3 on the surface of the pressure-sensitive adhesive layer facing away from the mesh release film.

[0116] Step 4: Preparation of the high surface energy ink layer 4: Coat high surface energy ink A on the surface of the printing layer 3 to form the high surface energy ink layer 4.

[0117] Step 5: Preparation of the foam layer 5: Coat a mixed slurry composed of acrylic slurry and elastic particles on the surface of the high surface energy ink layer 4 to obtain the foam layer 5.

[0118] Step 6: Preparation of the anti-sticking coating 6: Coat a mixed coating composed of the second ink and the second curing agent on the surface of the foam layer 5 to obtain the anti-sticking coating 6.

[0119] Example 2

[0120] This Example 2 is generally the same as Example 1, the difference is that: the UV resin solution includes the following raw materials in parts by weight: 100 parts of UV glue, 6 parts of difunctional UV crosslinking agent, 2 parts of trifunctional UV crosslinking agent, and 4 parts of UV initiator. Among them, the UV exposure amount during UV initial curing and UV secondary curing is both 1000 mj / cm 2 . Among them, the difunctional UV crosslinking agent is 1,6-hexanediol diacrylate, the trifunctional UV crosslinking agent is trimethylolpropane triacrylate, and the UV initiator is diphenyl-(2,4,6-trimethylbenzoyl) oxyphosphine (TPO).

[0121] Example 3

[0122] This Example 3 is generally the same as Example 1, the difference is that the UV resin solution includes the following raw materials in parts by weight: 100 parts of UV glue, 5 parts of trifunctional UV crosslinking agent, and 3 parts of UV initiator. Among them, the UV exposure amount during UV initial curing and UV secondary curing is both 1500 mj / cm 2 . Among them, the trifunctional UV crosslinking agent is pentaerythritol triacrylate, and the UV initiator is isopropyl thioxanthone ITX1105.

[0123] Example 4

[0124] This Example 4 is generally the same as Example 1, the difference is that the UV resin solution includes the following raw materials in parts by weight: 100 parts of UV glue, 3 parts of tetrafunctional UV crosslinking agent, and 4 parts of UV initiator. Among them, the UV exposure amount during UV initial curing and UV secondary curing is both 1000 mj / cm 2Among them, the tetra-functional UV cross-linking agent is pentaerythritol tetraallyl ether, and the UV initiator is 1-hydroxycyclohexyl phenyl ketone (PI-184).

[0125] Example 5

[0126] Example 5 is generally the same as Example 1, except that the UV resin solution includes the following raw materials in parts by weight: 100 parts of UV glue, 5 parts of difunctional UV cross-linking agent, 4 parts of trifunctional UV cross-linking agent, 3 parts of tetra-functional UV cross-linking agent, and 3 parts of UV initiator. Among them, the UV exposure amount during UV initial curing and UV secondary curing is both 2000 mj / cm 2 Among them, the difunctional UV cross-linking agent is polyurethane-modified diallyl acrylate oligomer (DOUBLEMER® 5222), the trifunctional UV cross-linking agent is pentaerythritol triacrylate, the tetra-functional UV cross-linking agent is tetra-functional polyester acrylate (ETERCURE 6325-100), and the UV initiator is diphenyl-(2,4,6-trimethylbenzoyl) phosphine oxide (TPO).

[0127] Example 6

[0128] Example 6 is generally the same as Example 1, except that in the raw material composition of the high surface energy ink A, the addition amount of the first curing agent is 10 parts.

[0129] Example 7

[0130] Example 7 is generally the same as Example 1, except that: in the raw material composition of the foam layer 5, the addition amount of the elastic particles is 2 parts.

[0131] Example 8

[0132] Example 8 is generally the same as Example 1, except that: in the raw material composition of the foam layer 5, the addition amount of the elastic particles is 3 parts.

[0133] Example 9

[0134] Example 9 is generally the same as Example 1, except that: in the raw material composition of the foam layer 5, the particle size of the elastic particles is 30 μm, and the addition amount of the elastic particles is 3 parts.

[0135] Example 10

[0136] Example 10 is generally the same as Example 1, except that: in the raw material composition of the foam layer 5, the particle size of the elastic particles is 70 μm, and the addition amount of the elastic particles is 2 parts.

[0137] Example 11

[0138] Example 11 is generally the same as Example 1, except that: the thickness of the anti-sticking coating 6 is 9 μm.

[0139] Example 12

[0140] Example 12 is generally the same as Example 1, except that the thickness of the anti-sticking coating 6 is 13.5 μm.

[0141] Comparative Example 1

[0142] Comparative Example 1 uses a grid release film prepared by an existing lamination process, and the material of the grid layer of the grid release film is PE material.

[0143] Comparative Example 2

[0144] Comparative Example 2 is generally the same as Example 1, except that in the raw material composition of the high surface energy ink A, the addition amount of the first curing agent is 0 part.

[0145] Comparative Example 3

[0146] Comparative Example 3 is generally the same as Example 1, except that the high surface energy ink layer 4 is prepared from high surface energy ink B, and high surface energy ink B includes the following raw materials in parts by weight: 100 parts of ink, and the addition amount of the curing agent is 0 part; wherein the color of the ink is black, the solid content is 31 ± 2%, the viscosity is 10 - 14 seconds, the surface tension is 46 dyne, the halogen in the ink ≤ 400 ppm, the adhesion of the ink (cross-cut method) is 4B, the main component of the ink is polyurethane resin; the curing agent is isophorone diisocyanate.

[0147] Comparative Example 4

[0148] Comparative Example 4 is generally the same as Example 1, except that the high surface energy ink layer 4 is prepared from high surface energy ink B, and high surface energy ink B includes the following raw materials in parts by weight: 100 parts of ink, and the addition amount of the curing agent is 5 parts; wherein the color of the ink is black, the solid content is 31 ± 2%, the viscosity is 10 - 14 seconds, the surface tension is 46 dyne, the halogen in the ink ≤ 400 ppm, the adhesion of the ink (cross-cut method) is 4B, the main component of the ink is polyurethane resin; the curing agent is isophorone diisocyanate.

[0149] Comparative Example 5

[0150] Comparative Example 5 is generally the same as Example 1, except that the high surface energy ink layer 4 is prepared from high surface energy ink B, and high surface energy ink B includes the following raw materials in parts by weight: 100 parts of ink, and the addition amount of the curing agent is 10 parts; wherein the color of the ink is black, the solid content is 31 ± 2%, the viscosity is 10 - 14 seconds, the surface tension is 46 dyne, the halogen in the ink ≤ 400 ppm, the adhesion of the ink (cross-cut method) is 4B, the main component of the ink is polyurethane resin; the curing agent is isophorone diisocyanate.

[0151] Comparative Example 6

[0152] Comparative Example 6 is substantially the same as Example 1, except that: the surface of the foam layer 5 does not have an anti - sticking coating 6.

[0153] Comparative Example 7

[0154] Comparative Example 7 is substantially the same as Example 1, except that: the thickness of the anti - sticking coating 6 is 1μm.

[0155] Relevant performance tests

[0156] I): The composition components of the resin grid layer in Examples 1 - 5 are listed in Table 2.

[0157] Table 2 Composition components table of the resin grid layer

[0158]

[0159] And the heat - resistance experiments of the grid release films prepared in Examples 1 - 5 are carried out, and the results are shown in Table 3:

[0160] Table 3 Heat - resistance experiment results of the grid release films prepared in Examples 1 - 5 and Comparative Example 1

[0161]

[0162] Among them, Comparative Example 1 is a grid release film prepared by using the existing film - coating process, and the material of the grid layer of the grid release film is PE material.

[0163] It can be concluded from Table 3 that the resin grid layer and the entire grid release film prepared by using the UV resin liquid of the present application are high - temperature resistant and can remain unchanged at 90 - 150 °C, so as to ensure that the exhaust grooves formed on the pressure - sensitive adhesive layer are of uniform depth, and ensure the exhaust performance and disappearability of the exhaust grooves.

[0164] II): Experiment on the correlation between the physical dimensions of the pressing grooves and ridges of the grid structure of the grid release film and the exhaust performance and disappearability of the exhaust grooves of the pressure - sensitive adhesive layer.

[0165] Next, we further explore the correlation between the physical dimensions of the pressing grooves and ridges (such as depth, width) and the node structure dimensions and the exhaust performance and disappearability of the exhaust grooves formed on the pressure - sensitive adhesive layer: taking the circumscribed circle diameter of the node structure 133, the depth of the pressing groove and ridge 132, and the width of the pressing groove and ridge 132 as variables, with other conditions being the same (such as all using hexagonal grids, the composition and thickness of the UV resin grid layer being the same, the material of the base material layer being the same, etc.), to explore the correlation between the physical dimensions of the pressing grooves and ridges and the exhaust performance and disappearability of the exhaust grooves, that is, to conduct a correlation orthogonal experiment (where the influencing factor table is shown in Table 4), and the orthogonal experiment results are shown in Table 5:

[0166] Table 4: Influence Factor Scheme Table

[0167]

[0168] Table 5 Orthogonal Experiment Results

[0169]

[0170] Remark: For the exhaust effect and the disappearable effect, performance tests need to be carried out after making them into tape products. This orthogonal experiment is compared and evaluated by making a standard grid single-sided tape (at least including a grid release film, a pressure-sensitive adhesive layer, and a substrate layer stacked in sequence from bottom to top). The evaluation criteria are shown in Table 6:

[0171] Table 6 Evaluation Criteria for the Exhaust Effect and Disappearable Effect of the Exhaust Grooves in the Pressure-Sensitive Adhesive Layer

[0172]

[0173] Remark: The reticulation here refers to the grid-shaped exhaust grooves.

[0174] Among them, (1): Exhaustibility test: Place the made grid single-sided tape in an environment with a temperature of 23±2°C and a humidity of 65±5%. Cut the foam tape into a size of 50mm×50mm. Then attach the adhesive layer of the tape to the glass plate, and quickly rotate and press clockwise with your finger at the bubbling place in the middle of the tape to see its exhaust speed and whether it can exhaust air.

[0175] (2): Disappearability test: Cut the made grid single-sided tape into a size of 50×50mm. Tear off the grid release film on the tape, and flatly attach the grid adhesive surface to the white glass; roll it back and forth 3 times with a 2kg rubber roller (at a speed of 25mm / sec). Place the attached sample in a normal temperature environment, and observe the disappearance of the reticulation every 1hr with an LED lamp and a magnifying glass, and record the disappearance time (observe all positions and record the disappearance time after determining that the reticulation has completely disappeared).

[0176] Therefore, from the orthogonal experiment results - Table 5, we can conclude that: the depth (height) of the grooved rib is 5 - 10um; the width of the grooved rib is 19 - 25um; the size of the node structure formed by the intersection of the grooved ribs is less than or equal to 30um (i.e., in the range of 15~30μm) is the best range. Within this range, when the exhaust grooves transferred to the surface of the pressure-sensitive adhesive are actually attached to the item to be pasted, the bubbles in the exhaust grooves can be discharged, and the exhaust grooves can also completely disappear.

[0177] More preferably, when the depth of the grooved rib is 5 μm, the width of the grooved rib is 19 μm, and the outer diameter of the circumscribed circle of the node structure is 25 μm, the best exhaust effect and disappearable effect can be achieved; or when the depth of the grooved rib is 8 μm, the width of the grooved rib is 25 μm, and the outer diameter of the circumscribed circle of the node structure is 15 μm, the best exhaust effect and disappearable effect can be achieved; or when the depth of the grooved rib is 10 μm, the width of the grooved rib is 22 μm, and the outer diameter of the circumscribed circle of the node structure is 15 μm, the best exhaust effect and disappearable effect can be achieved. Coupled with the hexagonal grid and the UV resin grid layer, the prepared grid release film can be deformed at high temperature, and the bubbles in the exhaust grooves transferred to the pressure-sensitive adhesive layer can be quickly discharged and the disappearable effect can also be achieved.

[0178] III): Perform surface tension, adhesion to the printing layer 3, and adhesion to the foam layer 5 tests on the high-surface ink layers 4 prepared in Example 1, Example 6, and Comparative Examples 2-5 respectively: The results are shown in Table 7.

[0179] Among them, for the surface tension test: it is tested according to the standard dyn pen.

[0180] For the adhesion test to the printing layer 3: Place the surface of the high-surface ink layer 4 of the sample to be tested facing upwards, and then attach the 3M600 tape to the surface of the high-surface energy ink layer 4 of the sample to be tested. Roll a 2 kg roller back and forth once to ensure that the 3M600 tape is attached flat; quickly peel it off at a speed of ≥20 cm / S, and observe the ink peeling situation.

[0181] The adhesion test to the foam layer 5 is also tested according to the above method.

[0182] Table 7 Surface tension and adhesion test results of the high-surface ink layers of each example and comparative example

[0183]

[0184] IV): Explore the influence of the particle size and addition ratio of the elastic particles of the foam layer 5 with a thickness of 100 μm prepared in each of the above examples on the buffering force and roughness: The influencing factors are shown in Table 8 below, and the experimental results are shown in Table 9.

[0185] Among them, the impact absorption rate test includes: 1) Take the sample to be tested, with a size of 75 mm × 75 mm, and attach it to a 75 mm × 75 mm glass plate with a thickness of 0.7 mm; 2) Take a 4.3 g steel ball, adjust the falling height of the steel ball to 10.1 cm, magnetically adsorb the steel ball, and the platform below the steel ball is made of stainless steel with a sensor. Test the initial impact force. To reduce equipment errors, 3 groups of point impact blank tests need to be conducted as a control group to ensure that the values of the 3 groups of blank tests are similar and take the average value to obtain the initial impact force finally; 3) After the blank test is completed, place the glass plate with the sample to be tested attached on it with the glass surface facing down and the foam surface facing up in the middle of the stainless steel platform, and test the point impact force. Conduct 3 tests, obtain 3 groups of point impact force values and take the average value to obtain the impact force II; 4) Calculate the point impact absorption rate according to the formula: ((initial impact force - impact force II) / initial impact force) × 100%.

[0186] Roughness test includes: 1) Place the sample to be tested in an environment of 23 ± 2 °C for more than 20 minutes, and cut the sample to be tested into 50 mm × 250 mm; 2) After connecting the probe of the surface roughness tester, turn on the test instrument. After turning on, it shows "0.000 μm". Take out the calibration plate for calibration. Place the probe on the calibration plate to ensure that the test value is within the specified range to complete the calibration. Note that the calibration plate should be placed on a horizontal tabletop during calibration; 3) Place the sample to be tested on the test backing plate with the test surface facing up, and place the test instrument on the sample to be tested to start the test; 4) Repeat step 3), and take the average value of the values obtained after testing three different test points on the test surface of the sample to be tested.

[0187] Table 8 Influence factor scheme table of elastic particles

[0188]

[0189] Table 9 Orthogonal experiment results

[0190]

[0191] During the overall design, two issues of impact absorption rate and appearance should be considered. Considering comprehensively, the data of the 4th - 6th experimental groups are more suitable.

[0192] Therefore, from the above Tables 8 - 9, it can be obtained that in the above embodiments, especially the foam layer 5 prepared in Embodiment 1 and Embodiments 7 - 10 has appropriate impact absorption rate and roughness.

[0193] V): Test the anti - sticking situation of the anti - sticking coatings 6 prepared in Embodiment 1, Embodiments 11 - 12, and Comparative Examples 6 - 7, the adhesion force between the anti - sticking coating and the copper foil tape after the anti - sticking coating is adhered to the copper foil tape, and the roughness of the prepared anti - sticking coatings respectively. The results are shown in Table 10 below:

[0194] Table 10 Anti-sticking situation, copper foil adhesion, and roughness test results of the anti-sticking coating 6

[0195]

[0196] It can be determined from Table 10 that the anti-sticking coating 6 with a thickness of 4.5 - 13.5 μm has good roughness and high adhesion to the copper foil tape (functional layer 7). Since the prepared anti-sticking coating has no adhesiveness, the foam tape can be stored for a long time. Further, from Table 10, we can also obtain that the thickness of the anti-sticking coating 6 affects the roughness, anti-sticking situation, and copper foil adhesion performance, and the best thickness of the anti-sticking coating is about 9 μm.

[0197] For the copper foil adhesion test: The adhesive layer of the composite tape is attached to the middle part of the steel plate, and then it is rolled 3 times with an electric rolling roller at a speed of 300 mm / min. The traction tape is attached to the non-test surface of the copper foil tape to obtain the sample to be tested; after the processed sample to be tested is placed in an environment of 23 ± 2 °C for 20 min, the steel plate is installed on the moving fixture of the tensile machine, and the traction tape is fixed on the fixed fixture, and the peeling is carried out at an angle of 180° and a speed of 300 mm / min to test the adhesion between the anti-sticking coating and the copper foil tape.

[0198] The roughness is tested with reference to the above method.

[0199] It should be understood that various forms of processes shown above can be used, reordering, adding, or deleting steps. For example, the steps described in this disclosure can be executed in parallel, sequentially, or in a different order, as long as the desired results of the technical solutions disclosed in this disclosure can be achieved, and no limitation is made herein. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this disclosure, "a plurality" means two or more unless otherwise specifically defined. The above is only the specific implementation manner of this disclosure, but the protection scope of this disclosure is not limited thereto. Any person skilled in the art within the technical scope disclosed in this disclosure can easily think of changes or substitutions, which should all be covered within the protection scope of this disclosure. Therefore, the protection scope of this disclosure should be subject to the protection scope of the claims.

Claims

1. A foam tape, characterized in that: It comprises a grid release film, a glue layer, a printing layer, a high surface energy ink layer and a foam layer stacked in sequence from bottom to top; wherein the high surface energy ink layer is prepared from the following raw materials in parts by weight: 100 parts of a first ink and 5-10 parts of a first curing agent; The grid release film comprises a substrate layer, a resin grid layer and a release layer stacked in sequence from bottom to top; a grid structure is formed on the side of the resin grid layer in contact with the release layer, and the grid structure is composed of a plurality of hexagonal grids connected to each other; the grooved convex strips formed between adjacent hexagonal grids intersect at the vertex positions of the hexagonal grids to form a node structure, the diameter of the circumscribed circle of the node structure is 15-30 μm, the depth of the grooved convex strips is 5-10 μm, and the width of the grooved convex strips is 19-25 μm; the circumscribed circle of the node structure is the circumscribed circle of a virtual triangle formed by the wide sides of adjacent grooved convex strips at the intersection position; Among them, the resin grid layer is configured to be able to remain unchanged at at least 100°C, and the resin grid layer is formed by UV resin liquid photocuring; the UV resin liquid includes the following raw materials in parts by weight: 100 parts of UV glue, 3-12 parts of UV cross-linking agent, and 3-4 parts of UV initiator; wherein the UV cross-linking agent is a mixture of one or more of a difunctional UV cross-linking agent, a trifunctional UV cross-linking agent, and a tetrafunctional UV cross-linking agent.

2. The foam tape according to claim 1, characterized in that: The first ink has a solid content of 28.5±1%, a viscosity of 20 to 30 seconds, a surface tension of 68 dyne / cm, and a main component of polyurethane resin; The first curing agent is an isocyanate curing agent.

3. The foam tape according to claim 1, characterized in that: The foam layer is prepared from the following raw materials in parts by weight: 100 parts of acrylic slurry and 1-3 parts of elastic particles, wherein the particle size of the elastic particles is 30-50 μm; Alternatively, the foam layer is prepared from the following raw materials in parts by weight: 100 parts of acrylic slurry and 1-2 parts of elastic particles, wherein the particle size of the elastic particles is 30-70 μm.

4. The foam tape according to claim 3, characterized in that: The solid content of the acrylic slurry is 40% to 60%, and the density of the acrylic slurry is 0.75±0.1 g / cm 3 , storage modulus is 500~1000KPa, glass transition temperature TG is 0~20°C, creep recovery rate at 25°C is 80~100%, and the main component of the acrylic slurry is polyacrylate; The elastic particles are a mixture of one or more of glass microspheres, acrylonitrile microspheres, and polyborosiloxane microspheres.

5. The foam tape according to any one of claims 1 to 4, characterized in that: The foam tape further comprises a non-stick coating, which is formed by coating on the surface of the foam layer facing away from the grid release film.

6. The foam tape according to claim 5, characterized in that: The anti-stick coating is prepared from the following raw materials in parts by weight: 100 parts of the second ink and 5 parts of the second curing agent.

7. The foam tape according to claim 6, characterized in that: The thickness of the anti-stick coating is 4.5-13.5 μm; The second ink has a solid content of 31±2%, a viscosity of 10-14 seconds, a surface tension of 58 dyne / cm, and a main component of polyurethane resin; The second curing agent is an isocyanate curing agent.

8. A composite tape, characterized in that: The foam tape comprises the foam tape according to any one of claims 1 to 7, further comprising a functional layer, wherein the functional layer is laminated on the surface of the anti-sticking coating layer facing away from the foam layer.

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