Foam tape and composite tape

Abstract

The invention provides a foam tape and a composite tape. The invention relates to the technical field of adhesive tapes. The foam tape comprises a grid release film, an adhesive layer, a printing layer, a high-surface-energy ink layer and a foam layer which 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 first ink and 5-10 parts of a first curing agent. According to the foam tape provided by the invention, the contact surface of the printing layer and the foam layer is coated with the high-surface-energy ink to form the high-surface-energy ink layer, and then the foam layer is stacked on the high-surface-energy ink layer, so that the surface performance of the printing layer is changed by the high-surface-energy ink, and the adhesion performance with the foam layer is improved. The high-surface-energy ink layer can improve the wetting effect of the foam layer and the printing layer, the purpose of repeated combination with the foam layer is achieved, and the problem of layering of the foam surface of the foam layer and the printing layer is solved.

Description

Technical Field

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

[0002] Foam tape generally includes a release film, a pressure-sensitive adhesive layer, a PET printing layer and a foam layer. Foam tape is widely used in electronic equipment, auto parts, building caulking and other fields. The foam layer of the foam tape currently on the market is prepared by a supercritical process. Carbon dioxide is injected into the foam layer to 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 for the foam layer and the PET printing layer to have delamination problems. In addition, the foam layer of the foam tape on the existing market will be slightly sticky, and the parent roll will appear in a reverse peeling state after long-term storage, causing product abnormalities. In addition, for example, when foam tape is used in the field of electronic equipment, it is often necessary to laminate the functional layer (such as copper foil tape, aluminum tape or ceramic tape) on the surface of its foam layer to achieve a specific effect. However, taking copper foil tape as an example, we found that the bonding effect of the foam layer of the foam tape is not good, and the foam layer and the copper foil tape are prone to delamination; and due to the large surface roughness of the foam layer, it will cause serious orange peel after laminating the copper foil tape.

[0003] In addition, the current preparation method of the grid release film generally includes first melting the PE particles, then coating on the surface of the substrate, embossing, cooling to form a grid layer on the surface of the substrate, and then coating the surface of the grid layer with a release agent to form a release layer on the grid layer. For example, a Chinese patent application (CN106273956A) discloses an embossed release film, including a substrate layer, a coating layer and a release layer; the coating layer is arranged on the substrate layer, and a texture is formed on the surface of the coating layer; the release layer is arranged on the coating layer and matches and fits with the texture; the coating layer is a polyethylene layer or a polypropylene layer. However, this grid layer / coating layer prepared from PE material (maximum temperature resistance 90°C) is not resistant to high temperatures. 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, the grid embossing on the surface of the release film will be deformed, resulting in the grid-shaped exhaust grooves formed on the pressure-sensitive adhesive being of different depths and the exhaust effect being unstable.

[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 adhered object, the bubbles in the exhaust grooves cannot be discharged and the exhaust grooves cannot disappear within the preset time. This not only affects the production rhythm, but also affects the appearance and performance of the adhered objects, and also requires additional equipment to eliminate the bubbles, which undoubtedly increases production costs and production efficiency. Summary of the invention

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

[0006] According to a first aspect of the present disclosure, a foam tape is provided, comprising a grid release film, an adhesive 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 to 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 acrylic slurry and 1 to 3 parts of elastic particles, wherein the particle size of the elastic particles is 30 to 50 μm; or, the foam layer is prepared from the following raw materials in parts by weight: 100 parts of acrylic slurry and 1 to 2 parts of elastic particles, wherein the particle size of the elastic particles is 30 to 70 μm.

[0009] Preferably, 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 , the storage modulus is 500~1000KPa, the glass transition temperature TG is 0~20℃, the creep recovery rate at 25℃ is 80~100%, 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 grid release film comprises a substrate layer, a resin grid layer and a release layer which are 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 top corners of the hexagonal grids to form a node structure, and the circumscribed circle diameter of the node structure is 15 to 30 μm.

[0011] Preferably, the depth of the grooved convex strip is 5-10 μm, and the width of the grooved convex strip is 19-25 μm.

[0012] Preferably, 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 to 12 parts of UV cross-linking agent, and 3 to 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.

[0013] Preferably, the foam tape further comprises a non-stick coating, and the non-stick coating is coated on the surface of the foam layer facing away from the grid release film.

[0014] Preferably, 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.

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

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

[0017] Compared with the prior art, the advantages of the present application are: 1) The foam tape provided by the present application is coated with high surface energy ink 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 bonding performance with the foam layer. The high surface energy ink layer can improve the wetting effect of the foam layer and the printing layer, achieve the purpose of repeated bonding with the foam layer, and solve the problem of stratification between the foam layer and the printing layer. 2) The foam layer in the foam tape of the present application is made of high modulus acrylic slurry and elastic particles mixed in a certain proportion, and then coated on the surface of the high surface energy ink layer away from the pressure-sensitive adhesive layer, thereby forming the foam layer. After coating, the high modulus acrylic slurry forms a support frame, and the elastic particles are filled in it to alleviate the impact force. When the foam layer is subjected to a point impact force, the foam layer will first deform and absorb part of the impact force, and the elastic particles inside it will also be deformed under pressure and absorb another part of the impact force, thereby reducing the impact force transmitted to the functional layer under the foam layer. Therefore, 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 to bond electronic devices, such as bonding to the screen of the electronic device, it can avoid the impact of external impact forces on the screen. 3), the grooved convex strips 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 intersect at the top corners of the hexagons to form exhaust nodes, so that after the grid release film is peeled off from the pressure-sensitive adhesive layer, the pressure-sensitive adhesive layer as a whole has a grid-shaped exhaust groove, so that when the pressure-sensitive adhesive layer is bonded to the object to be bonded, the bubbles in the exhaust groove can be quickly discharged and the exhaust groove can disappear within a preset time. 4) The resin grid layer of the present application is formed by UV resin liquid photocuring, so that the resin grid layer is resistant to high temperature. Therefore, when the pressure-sensitive adhesive is coated on the surface of the release layer of the grid release film and dried to form a pressure-sensitive adhesive layer, it can ensure that the entire grid release film is not deformed, and the grid structure is not deformed, thereby ensuring that the depth of the exhaust groove formed on the surface of the pressure-sensitive adhesive layer is consistent, and the exhaust stability and disappearance of the exhaust groove are guaranteed. 5) The present application fills the different concave and convex surfaces of the foam layer by coating an anti-stick coating with high filling and high surface energy on the surface of the foam layer, thereby improving the roughness of the foam layer and improving the appearance of the product. The increase in surface energy significantly improves the bonding strength with the copper foil tape, solving the stratification problem caused by the low bonding strength between the copper foil tape and the foam layer currently on the market. And due to the presence of the anti-stick coating, the problem of high roughness of the foam layer is solved, so that after the copper foil tape is stacked on the anti-stick coating, there will be no orange peel pattern. In addition, since the anti-stick coating is not sticky, the foam tape mother roll can be stored for a long time without the problem of anti-sticking of the mother roll during long-term storage.

[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 intended to limit the scope of the present disclosure. Other features of the present disclosure will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and other objects, features and advantages of the exemplary embodiments of the present disclosure will become readily understood by reading the detailed description below with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present disclosure are shown in an exemplary and non-limiting manner, in which: In the drawings, the same or corresponding reference numerals represent the same or corresponding parts.

[0020] Figure 1 A schematic diagram showing the structure of the foam tape according to an embodiment of the present disclosure is shown; Figure 2 The schematic diagram of the foam layer and the direction of impact force transmission when the foam layer is subjected to a point impact force in the 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); Figure 3 A schematic diagram showing the structure of a grid release film and a pressure-sensitive adhesive layer in an embodiment of the present disclosure is shown; Figure 4 A top view of the grid release film of an embodiment of the present disclosure under a microscope is shown; Figure 5 A schematic diagram showing a node structure formed by the intersection of grooves and convex strips of a grid structure according to an embodiment of the present disclosure is shown; Figure 6 A schematic diagram showing the arrangement of a grid structure composed of hexagonal grids and a grid structure composed of quadrilateral grids according to an embodiment of the present disclosure is shown; Figure 7 The node structure formed by the intersection of the grooves and convex strips in the first case of the embodiment of the present disclosure is shown; Figure 8 The node structure formed by the intersection of the grooves and convex strips in the second case of the embodiment of the present disclosure is shown; Fig. 9 The node structure formed by the intersection of the grooves and convex strips in the third case of the embodiment of the present disclosure is shown; Fig.10 A schematic structural diagram of a composite tape according to an embodiment of the present disclosure is shown.

[0021] Figure numbers: 1-grid release film, 2-adhesive layer, 3-printing layer, 4-high surface energy ink layer, 5-foam layer, 6-anti-stick 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-grooved convex strips, 133-node structure, 22-microstructure adhesive layer, 21-second planar adhesive layer, 221-venting grooves. DETAILED DESCRIPTION

[0022] In order to make the purpose, features, and advantages of the present disclosure more obvious and easy to understand, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present disclosure.

[0023] According to one embodiment of the present disclosure, Figure 1-5 As shown, the present invention provides a foam tape, comprising a grid release film 1, an adhesive layer 2, a printing layer 3 and a foam layer 5 which are stacked in sequence from bottom to top, wherein a high surface energy ink layer 4 is provided between the printing layer 3 and the foam layer 5, and the high surface energy ink layer 4 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.

[0024] The foam tape provided by the present application is coated with high surface energy ink on the contact surface between the printing layer 3 and the foam layer 5 to form a high surface energy ink layer, and then the foam layer is stacked on the high surface energy ink layer 4. The provision of the high surface energy ink layer 4 changes the surface properties 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 of the foam layer 5 and the printing layer 3, achieve the purpose of repeated bonding with the foam layer, and solve the problem of stratification between the foam layer and the printing layer.

[0025] 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.

[0026] 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.

[0027] For example, the printing layer 3 is a PET printed black film (ie, a printing film), and the material of the printing layer 3 includes but is not limited to PET material.

[0028] For example, the high surface energy ink layer 4 has ultra-high surface energy, and the surface tension of the high surface energy ink layer 4 is ≥56 dyne (ie, dyne / cm), and 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 56-62 dyne. It has good adhesion to the low surface energy surface (30-38 dyne) and will not fall off.

[0029] For example, the first ink has a solid content of 28.5±1%, a viscosity of 20 to 30 seconds, a surface tension of 68 dyne, and a main component of polyurethane resin.

[0030] The first curing agent is an isocyanate curing agent. 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.

[0031] Preferably, 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 (by the 100 grid method) is 4B, and the main component of the first ink is polyurethane resin. Accordingly, the first curing agent is hexamethylene diisocyanate.

[0032] In some embodiments, the foam layer 5 is prepared from the following raw materials in parts by weight: 100 parts of acrylic slurry with high modulus and 1 to 3 parts of elastic particles, wherein the particle size of the elastic particles is 30-50 μm. Alternatively, the foam layer 5 is prepared from the following raw materials in parts by weight: 100 parts of acrylic slurry with high modulus and 1 to 2 parts of elastic particles, wherein the particle size of the elastic particles is 30 to 70 μm.

[0033] The acrylic slurry is a high modulus acrylic slurry, and the high modulus acrylic slurry needs to meet the following characteristics: the solid content of the acrylic slurry is 40% to 60%, the density of the acrylic slurry is 0.75 ± 0.1 g / cm 3 , storage modulus is 500~1000KPa, TG (glass transition temperature) is 0~20°C, creep recovery rate at 25°C is 80~100%, and the main component of the acrylic slurry is polyacrylate.

[0034] Preferably, the color of the acrylic slurry is black or navy blue, the solid content of the acrylic slurry is 50±2%, and the density of the acrylic slurry is 0.75±0.025 g / cm 3 , storage modulus is 710 KPa, TG (glass transition temperature) is 10°C, creep recovery rate at 25°C is 85.4%, and the main component of the acrylic slurry is polyacrylate.

[0035] More preferably, the compression rebound force (CFD) of the foam layer 5 prepared from the acrylic slurry and the elastic particles is 150-250 KPa when the thickness is 10 mm and the compression ratio is 25%; the density of the prepared foam layer 5 is 0.6±0.05 g / cm 3 .

[0036] Among them, in order to better screen out the elastic particles, we adopt the mode of foaming the elastic particles first and then screening them before compounding with the acrylic slurry. This can effectively avoid the problem of incomplete foaming of the elastic particles, which leads to fluctuations in the impact resistance of the product.

[0037] 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.

[0038] In this embodiment, the foam layer 5 is formed by mixing high modulus acrylic slurry and elastic particles in a certain ratio, and then coating the surface of the high surface energy ink layer 4 away from the pressure sensitive adhesive layer / printing layer, thereby forming the foam layer 5. The high modulus acrylic slurry is coated to form a support frame, and the elastic particles are filled in it to relieve the impact force. Figure 2 (a) Figure 2 (b). It can be compared to the foam layer and spring in a Simmons mattress. When the foam layer 5 is subjected to a point impact force, the foam layer 5 will first 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. Therefore, 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 to bond electronic devices, such as bonding to the screen of the electronic device, it can avoid the impact of external impact on the screen.

[0039] In some embodiments, Figure 3-6 As shown, the grid release film 1 includes a substrate layer 11, a resin grid layer 12 and a release layer 14 which are stacked in sequence from bottom to top; a grid structure 13 is formed on the side of the resin grid layer 12 that contacts the release layer, and the grid structure 13 is composed of a plurality of uniformly arranged hexagonal grids 131 connected to each other, and grooved convex strips 132 are formed between adjacent hexagonal grids, and the grooved convex strips 132 formed between adjacent hexagonal grids intersect at the top corners of the hexagonal grids to form a node structure 133, which is generally in a triangular shape, and the diameter of the circumscribed circle of the node structure is 15-30 μm, the depth of the grooved convex strip is 5-10 μm, and the width of the grooved convex strip is 19-25 μm.

[0040] Exemplarily, the depth of the grooved convex strip can be 5μm, 8μm, 10μm. The width of the grooved convex strip can be 19μm, 22μm, 25μm. The diameter of the circumscribed circle of the node structure can be 15μm, 20μm, 25μm, 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 lines connecting the vertices of each adjacent hexagon at the intersection. That is, the circumscribed circle of the virtual triangle formed by the wide sides (in the width direction) of adjacent grooved convex strips at the intersection.

[0041] For example, Figure 5 As shown, the hexagonal grid in this embodiment may be a regular hexagon, and the side length of the hexagonal grid is 160-180 um.

[0042] For example, the material of the substrate layer 11 is one of PET, PI, BOPP, paper and PEEK. The material of the release layer 14 is solvent silicone oil or solvent-free silicone oil. The material of the resin grid layer 12 is high temperature resistant resin.

[0043] The thickness of the substrate layer 11 is 25-188 μm, the thickness of the resin mesh layer 12 is 15-100 μm, and the thickness of the release layer 14 is 0.5-1 μm.

[0044] We found that when the grid structure 13 is composed of a plurality of uniformly arranged hexagonal grids 131 connected to each other, the corresponding exhaust grooves formed on the surface of the pressure-sensitive adhesive layer 2 are hexagonal exhaust grooves, and 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), thereby forming a grid shape. Under the same conditions, the number of hexagonal exhaust grooves and exhaust nodes are more than the current conventional quadrilateral exhaust grooves, and the more exhaust grooves and exhaust nodes, the better the exhaust effect, so the hexagonal exhaust grooves are better than the quadrilateral exhaust grooves in exhaust effect.

[0045] Therefore, this embodiment takes the grid structure 13 composed of hexagonal grids 131 as an example, and compares it with the conventional grid structure composed of quadrilateral grids in the market. Figure 6As shown, the grid-shaped hexagonal exhaust grooves and grid-shaped quadrilateral exhaust grooves formed by their transfer to the surface of the pressure-sensitive adhesive layer 2 are analyzed. We select hexagonal exhaust grooves and quadrilateral exhaust grooves with the same conditions and the same area for arrangement. The results show that the rule of increasing exhaust nodes is (the number and exhaust node rule of quadrilateral exhaust grooves and hexagonal exhaust grooves as 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, the grid release film needs to choose a polygonal graphic, 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 that meets these two points. Correspondingly, on the grid release film, the grid unit that constitutes the grid structure is the best choice of hexagonal grid.

[0046] Table 1 Number and exhaust node rules of conventional quadrilateral exhaust slots and hexagonal exhaust slots of the present application

[0047] Specifically, the side of the resin mesh layer 12 in contact with the release layer 14 is a mesh structure 13 in a mesh shape. The mesh structure 13 is composed of a plurality of uniformly arranged hexagonal meshes 131 connected to each other. These hexagonal meshes 131 are substantially arranged and connected to each other in a hexagonal shape by grooved convex strips 132, so that adjacent hexagonal meshes share a grooved convex strip. Figure 4 As shown. The grooved convex strips 132 between adjacent hexagonal grids intersect at the vertices of the hexagons to form a node structure 133, and these grooved convex strips 132 are connected to each other through the node structure. Therefore, when a pressure-sensitive adhesive layer is stacked on the surface of the grid release film 1, these grooved convex strips 132 on the grid structure can form corresponding grid-like hexagonal exhaust grooves 221 on the surface of the pressure-sensitive adhesive layer 2, and these exhaust grooves also intersect at the vertices of the hexagons to form exhaust nodes, so that after the grid release film is peeled off from the pressure-sensitive adhesive layer, the pressure-sensitive adhesive layer as a whole has the grid-like hexagonal exhaust grooves, so that when the pressure-sensitive adhesive layer is attached to the object, the bubbles in the exhaust grooves can be quickly discharged and the exhaust grooves can disappear within a preset time.

[0048] In the present application, the grid structure 13 on the grid release film is composed of hexagonal grids 131 as units connected to each other. We found that, compared with the quadrilateral grid structure on the conventional release film, under the same conditions, the more edges the polygonal grid has, the more exhaust nodes the exhaust grooves formed on the surface of the pressure-sensitive adhesive have, and the exhaust effect is positively correlated. Since the grid structure 13 is formed by transferring the resin liquid to the surface of the substrate layer using an anilox roller, it is necessary to first engrave a pattern corresponding to the grid structure on the anilox roller. Considering the difficulty of implementing the pattern on the anilox roller, a hexagonal grid is preferably used.

[0049] When the exhaust grooves 221 formed on the surface of the pressure-sensitive adhesive layer 2 are attached to the attached object, most of the bubbles in the exhaust grooves are gathered at the exhaust node positions. However, after the mesh release film on the market is stacked with the pressure-sensitive adhesive, the exhaust grooves on the surface of the pressure-sensitive adhesive cannot be discharged when the exhaust grooves are actually attached to the attached object, and the exhaust grooves cannot disappear within the preset time. After a lot of research and experiments, we found that when the size of the node structure 133 on the grid structure 13 of the mesh release film (i.e., the diameter of the circumscribed circle of the node structure) is limited to the range of 15~30μm, it can be matched with the width (19~25μm) and depth (5~10μm) of the groove convex strip 132, so that the bubbles in the exhaust grooves 221 on the pressure-sensitive adhesive layer 2 can be quickly discharged, and the exhaust grooves 221 can also disappear within the preset time.

[0050] In addition, when the mesh release film 1 is used in conjunction with the pressure-sensitive adhesive layer 2 to prepare the foam tape, a release layer 14 is first coated on the mesh structure of the resin mesh layer, thereby ensuring that the mesh release film 1 can be peeled off from the pressure-sensitive adhesive layer 2. The thickness of the release layer 14 is generally 0.5~1μm, and compared with the depth of the mesh structure, the thickness of the release layer 14 can be ignored. Therefore, when the mesh release film 1 composed of the substrate layer 11, the resin mesh layer 12 and the release layer 14 is stacked with the pressure-sensitive adhesive layer 2, the size of the mesh structure can be completely transferred to the pressure-sensitive adhesive layer 2, so that the corresponding mesh-shaped hexagonal exhaust grooves are formed on the surface of the pressure-sensitive adhesive layer 2. In addition, the depth, width and exhaust node size of the hexagonal exhaust grooves on the pressure-sensitive adhesive layer are comparable to the depth of the groove convex strips 132 of the mesh structure 13, the width of the groove convex strips and the size of the node structure 133.

[0051] Among them, we also found through research that the exhaust property and vanishability of the exhaust groove 221 on the surface of the pressure-sensitive adhesive layer 2 are a set of paradoxes, and the two are contradictory. If you want to ensure the exhaust property of the exhaust groove 221, you need to increase the physical size of the exhaust groove 221 (such as the depth of the exhaust groove 221 and the width of the exhaust groove 221), but the increase in the physical size of the exhaust groove 221 makes the vanishability of the exhaust groove 221 multiplied, which means that the vanishability of the exhaust groove 221 cannot be achieved. If you want to ensure the vanishability of the exhaust groove 221, you need to appropriately reduce the physical size of the exhaust groove 221, such as reducing the width of the exhaust groove 221 and the depth of the exhaust groove 221, but the bubbles in the exhaust groove 221 cannot be discharged smoothly. Therefore, it is necessary to find a balance between exhaust property and vanishability to ensure that these two properties can be achieved at the same time. In addition, since most of the bubbles in the exhaust groove 221 gather at the exhaust node position and are difficult to discharge, we have found through a large number of orthogonal experiments that, under the premise that the diameter of the circumscribed circle of the node structure 133 of the grid release film 1 is 15~30μm, when the depth of the pressed groove ridge 132 on the grid release film 1 is 5~10μm and the width of the pressed groove ridge 132 is 19~25μm, the exhaust groove 221 transferred on the surface of the pressure-sensitive adhesive layer 2 can be quickly discharged when the exhaust groove 221 is attached to the adhered object, whether it is the bubbles in the channel of the exhaust groove 221 or the bubbles in the exhaust node where the end of the exhaust groove 221 intersects, and the exhaust groove is also guaranteed to disappear within a preset time.

[0052] For example, Figure 3 As shown, the resin grid layer 12 includes a grid structure 13 and a first planar adhesive layer 121, and the first planar adhesive layer 121 is arranged between the grid structure 13 and the substrate layer 11. The grid structure 13 is arranged on the side of the first planar adhesive layer 121 away from the substrate layer 11, and the grid structure 13 protrudes from the first planar adhesive layer 121. The pressure-sensitive adhesive layer 2 includes a microstructure adhesive layer 22 and a second planar adhesive layer 21, and the second planar adhesive layer 21 is located between the microstructure adhesive layer 22 and the printing layer 3. The microstructure adhesive layer 22 is interlocked with the grid structure 13 and the release layer 14 thereon, and exhaust grooves 221 are formed on the microstructure adhesive layer 22, and the shape of these exhaust grooves 221 is hexagonal, and the hexagonal exhaust grooves 221 are interconnected to form a grid shape. Therefore, when the pressure-sensitive adhesive is coated on the release surface of the release layer 14 on the grid structure to form the pressure-sensitive adhesive layer 2, these groove convex strips on the grid structure are transferred to the surface of the pressure-sensitive adhesive layer, thereby forming a grid-shaped exhaust groove 221 on the surface of the pressure-sensitive adhesive layer 2.

[0053] For example, Figure 5As shown, the grooved convex strips 132 between adjacent hexagonal grids 131 intersect at the vertices of the hexagon to form a node structure 133. In the present application, the node structure 133 formed by the intersection of adjacent grooved convex strips 132 can be arranged in any of the following ways, including but not limited to: the grooved convex strips 132 between three adjacent hexagonal grids 131 intersect at one of the vertices of the hexagonal grid to form a node structure 133, and the shape of the node structure is a triangle. Figure 7 When the size of the node structure is slightly smaller, near the intersection, the two sides of the groove convex strip 132 gradually shrink inward, and the shape of the two sides is generally an outward convex arc shape, so that the width of the groove convex strip gradually decreases, so that the three groove convex strips 132 intersect to form a node structure 133.

[0054] Or, it can also be, Figure 8 As shown, when the size of the node structure 133 is slightly larger, near the intersection, the two side edges of the groove ridges 132 gradually expand outward, and the shape of the two side edges is generally an inwardly concave arc shape, so that the width of the groove ridges 132 gradually increases, so that the three groove ridges 132 converge to form a node structure 133.

[0055] Or, it can also be, Fig. 9 As shown, the width of the groove ridges 132 is constant. The groove ridges 132 meet to form a node structure 133.

[0056] In summary, the groove convex strip 132 is close to the node structure 133, and a transition section is formed between the groove convex strip 132 and the node structure 133. Towards the direction close to the node structure 133, the width of the transition section gradually decreases, or the width of the transition section gradually increases, or the width of the transition section remains unchanged.

[0057] The arrangement of the node structure formed by the intersection of the above-mentioned grooved convex strips needs to be adjusted accordingly according to the width of the grooved convex strips and the size of the node structure.

[0058] Since the resin grid layer is formed by embossing transfer with an anilox roller, a corresponding texture pattern can be engraved on the surface of the anilox roller in advance, and the structure and shape of the texture pattern correspond to the grid structure.

[0059] In some embodiments, the resin grid layer 12 is configured to be able to remain unchanged at at least 100°C, and the resin grid layer 12 is formed by UV resin liquid photocuring, and the UV resin liquid includes the following raw materials in parts by weight: 100 parts of UV glue, 3 to 12 parts (phr) of UV cross-linking agent, and 3 to 4 parts of UV initiator; wherein the UV cross-linking agent is a mixture of one or more of a bifunctional UV cross-linking agent, a trifunctional UV cross-linking agent, and a tetrafunctional UV cross-linking agent.

[0060] For example, the UV glue may be epoxy UV glue, and the available models include but are not limited to: Loctite EA3335, TSBD2640, and Loctite 3523.

[0061] The UV initiator can initiate a polymerization reaction when the material is exposed to ultraviolet light. Exemplarily, the UV initiator is a mixture of one or more of 1-hydroxycyclohexyl phenyl ketone (PI-184), diphenyl-(2,4,6-trimethylbenzoyl)phosphine oxide (TPO), 2-isopropylthioxanthone, and isopropylthioxanthone (ITX105).

[0062] Bifunctional UV crosslinkers include, but are not limited to, polyethylene glycol 400 diacrylate (PEG400DA), 1,6-hexanediol diacrylate (HDDA, also known as "1,6-hexanediol diacrylate"), and polyurethane-modified diacrylate oligomer (DOUBLEMER® 5222).

[0063] Trifunctional UV crosslinkers include, but are not limited to, trimethylolpropane tris[3-(2-methylaziridinyl) propionate] (TTMAP), trimethylolpropane triacrylate (TMPTA), and pentaerythritol triacrylate (PETA).

[0064] The tetrafunctional UV crosslinking agent includes, but is not limited to, pentaerythritoltetraallyl ether and tetrafunctional polyester acrylate (ETERCURE 6325-100).

[0065] In this embodiment, the resin mesh layer is formed by UV resin liquid light curing, so that the resin mesh layer is resistant to high temperature (the temperature is maintained at 90-150°C without deformation, and can even remain unchanged at above 150°C). Therefore, when the adhesive (i.e., pressure-sensitive adhesive) is coated on the surface of the release layer of the mesh release film and dried to form a pressure-sensitive adhesive layer, it can ensure that the entire mesh release film is not deformed, and the mesh structure is not deformed, thereby ensuring that the depth of the exhaust groove formed on the surface of the pressure-sensitive adhesive layer is consistent, and ensuring the exhaust stability and disappearance of the exhaust groove.

[0066] For example, in this embodiment, the grid release film is specifically prepared by the following method: comprising: The UV resin liquid is transferred and coated onto the surface of the substrate layer by an anilox roller, and then UV initial curing is performed to initially form a resin grid layer with a grid structure on the surface of the substrate layer. The UV exposure during UV initial curing is 500~2000 mj / cm 2 ; The substrate layer with the resin grid layer formed on the surface is subjected to UV secondary curing molding; wherein the UV exposure during UV secondary curing is 500~2000 mj / cm2 ; A release agent is coated on the surface of the grid structure of the resin grid layer to form a release layer.

[0067] In this embodiment, a UV resin liquid is added to the anilox roller, and the anilox roller transfers the UV resin liquid to the surface of the substrate layer in the form of embossing, and then UV primary curing is performed. After UV primary curing, a resin grid layer with a grid structure is formed on the surface of the substrate layer, and then further UV secondary curing is performed to form the resin grid layer on the surface of the substrate layer, further ensuring a stable connection between the resin grid layer and the substrate layer. It can be seen from this that the materials of the resin grid layer and the grid structure formed on one side are not only the same, but they are also one-step, integrated light-cured and formed on the surface of the substrate layer. Then a release agent (such as silicone oil) is applied on the surface of the grid structure to form a release layer.

[0068] In this embodiment, the coating process is used, which has more advantages in controlling the size and appearance than the conventional laminating process. The UV curing embossing molding is faster and more thorough, and the depth and width data of the formed grid structure are more stable.

[0069] In some embodiments, Figure 1 As shown, the foam tape of the present application further includes an anti-stick coating 6 , which is coated on the surface of the foam layer 5 facing away from the grid release film 1 .

[0070] For example, the anti-stick 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.

[0071] For example, the thickness of the anti-stick coating 6 is 4.5-13.5 μm. Exemplarily, the thickness of the anti-stick coating 6 is 4.5 μm, 5 μm, 7 μm, 9 μm, 11 μm, 13.5 μm. More preferably, the thickness of the anti-stick coating 6 is 9 μm.

[0072] For example, the surface tension of the anti-stick coating 6 is ≥52 dyne / cm. The anti-stick coating 6 has a strong adhesion effect with the foam layer 5 and good filling properties, and reduces the surface roughness of the foam layer 5.

[0073] For example, the second ink has a solid content of 31±2%, a viscosity of 10 to 14 seconds, a surface tension of 58 dyne, and a main component of polyurethane resin.

[0074] 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 agent includes but is not limited to: isophorone diisocyanate and hexamethylene diisocyanate.

[0075] 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 ≤400ppm, the adhesion of the second ink (Baige method) is 4B, and the main component of the second ink is polyurethane resin. Correspondingly, the second curing agent is hexamethylene diisocyanate.

[0076] After the second ink and the second curing agent are mixed and coated on the surface of the foam layer, the anti-stick coating 6 formed has no stickiness on the surface and has a strong adhesion effect with the foam layer 5. The anti-stick coating 6 formed has good filling properties and 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 the foam layer and the copper foil tape layer from stratifying. In addition, since the anti-stick coating has no stickiness, the foam layer can be debonded after coating, and the foam tape mother roll can be stored for a long time without the problem of anti-stickiness of the mother roll during long-term storage.

[0077] In summary, in this embodiment, by coating the surface of the foam layer 5 with a high filling and high surface energy anti-stick coating, the different concave and convex surfaces of the foam layer 5 are filled, so that the roughness of the foam layer 5 is improved, the product appearance is improved, and the product surface is smoother. In addition, the improvement of the surface energy significantly improves the bonding strength with the copper foil tape, solving the delamination problem caused by the low bonding strength between the copper foil tape and the foam layer 5 currently on the market. In addition, due to the presence of the anti-stick coating 6, the problem of high roughness of the foam layer is solved, so that after the copper foil tape is stacked on the anti-stick coating, there will be no orange peel pattern.

[0078] In addition, since the anti-stick coating 6 can make the foam layer lose its stickiness after being coated on the surface of the foam layer 5, the foam tape mother roll can be stored for a long time without the problem of anti-stickiness of the mother roll during long-term storage.

[0079] According to the second aspect of the present disclosure, Fig.10 As shown, the present invention further provides a functional composite tape, comprising the above-mentioned foam tape, and further comprising a functional layer 7 , wherein the functional layer 7 is laminated on the surface of the anti-sticking coating 6 facing away from the foam layer 5 .

[0080] 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.

[0081] Taking copper foil tape as an example, generally copper foil tape has a copper foil layer and an acrylic adhesive layer. Therefore, when the copper foil tape needs to be attached to the foam tape, it is only necessary to attach the acrylic adhesive layer of the copper foil tape to the anti-stick coating 6 of the foam tape, which can solve the copper foil orange peel phenomenon and avoid the delamination problem of the copper foil tape and the foam layer. In addition, since the foam layer contains elastic particles, 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.

[0082] The present application is further described in detail below with reference to specific embodiments: Example 1 1): If Figure 1 As shown, a foam tape comprises 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-stick coating 6 which are stacked in sequence from bottom to top.

[0083] The grid release film 1 includes a substrate layer 11 , a resin grid layer 12 and a release layer 14 which are stacked in sequence from bottom to top, and a grid structure 13 is formed on the side of the resin grid layer 12 contacting the release layer 14 .

[0084] The grid structure 13 is composed of a plurality of evenly arranged hexagonal grids 131 connected to each other, and grooved convex strips 132 are formed between adjacent hexagonal grids. The grooved convex strips 132 between adjacent hexagonal grids intersect at the vertex positions of the hexagonal grids to form a node structure 133. The shape of the node structure is a triangle, and the diameter of the circumscribed circle of the triangular node structure is 15-30 μm, the depth of the grooved convex strips 32 is 5-10 μm, and the width of the grooved convex strips 32 is 19-25 μm.

[0085] The material of the substrate layer 11 is PET, and the resin mesh layer 12 is formed by UV resin liquid photocuring, and 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).

[0086] The pressure-sensitive adhesive layer 2 is an acrylic pressure-sensitive adhesive layer with a thickness of 30 μm.

[0087] The high surface energy ink layer 4 is prepared from high surface energy ink A, which 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.

[0088] 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 68dyne, the halogen in the first ink is ≤100ppm, the adhesion of the first ink (by the 100 grid method) is 4B, and the main component of the first ink is polyurethane resin. The first curing agent is hexamethylene diisocyanate.

[0089] The foam layer 5 is prepared from the following raw materials in parts by weight: 100 parts of high modulus acrylic slurry and 1 part of elastic particles, wherein the particle size of the elastic particles 1 is 50 μm. The thickness of the foam layer 5 is 100 μm.

[0090] The color of the high modulus acrylic slurry is black, the solid content of the acrylic slurry is 50±2%, and the density of the acrylic slurry is 0.75±0.025 g / cm 3 , storage modulus is 710 KPa, TG (glass transition temperature) is 10℃, creep recovery rate at 25℃ is 85.4%, the main component of acrylic slurry is polyacrylate. The elastic particles are glass microspheres.

[0091] 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.

[0092] 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 ≤400ppm, the adhesion of the second ink (Baige method) is 4B, and the main component of the second ink is polyurethane resin. The second curing agent is hexamethylene diisocyanate 2): A method for preparing a foam tape: comprising the following steps: Step 1: Preparation of the grid release film 1: specifically comprising: Step 1-1): UV resin liquid is transferred and coated onto the surface of the substrate layer 11 by an anilox roller, and then UV initial curing is performed, thereby initially forming a resin grid layer 12 having a grid structure 13 on the surface of the substrate layer. The UV exposure during UV initial curing is 500 mj / cm 2 ; Step 1-2): The substrate layer with the resin grid layer formed on the surface is subjected to UV secondary curing molding; wherein the UV exposure during UV secondary curing is 500 mj / cm 2 ; Step 1-3): A release agent is coated on the surface of the grid structure of the resin grid layer to form a release layer 14.

[0093] Step 2: Preparation of the pressure-sensitive adhesive layer 2: coating a pressure-sensitive adhesive on the surface of the release layer facing away from the substrate layer, and drying the surface, thereby forming a pressure-sensitive adhesive layer on the surface of the release layer.

[0094] Step 3: Preparation of the printing layer 3: Prepare the printing layer 3 on the surface of the pressure-sensitive adhesive layer on the side facing away from the grid release film.

[0095] Step 4: Preparation of high surface energy ink layer 4: Coat high surface energy ink A on the surface of the printing layer 3 to form a high surface energy ink layer 4.

[0096] Step 5: Preparation of the foam layer 5: A mixed slurry formed by mixing acrylic slurry and elastic particles is coated on the surface of the high surface energy ink layer 4 to obtain the foam layer 5.

[0097] Step 6: Preparation of the anti-stick coating 6: A mixed coating consisting of a second ink and a second curing agent is coated on the surface of the foam layer 5 to obtain the anti-stick coating 6.

[0098] Example 2 The second embodiment is substantially the same as the first embodiment, except that the UV resin solution includes the following raw materials in parts by weight: 100 parts of UV glue, 6 parts of bifunctional UV crosslinking agent, 2 parts of trifunctional UV crosslinking agent, and 4 parts of UV initiator. The UV exposure during the UV primary curing and UV secondary curing is 1000 mj / cm 2 The bifunctional UV crosslinker is 1,6-hexanediol diacrylate, the trifunctional UV crosslinker is trimethylolpropane triacrylate, and the UV initiator is diphenyl-(2,4,6-trimethylbenzoyl)phosphine oxide (TPO).

[0099] Example 3 The present embodiment 3 is substantially the same as the embodiment 1, except that the UV resin solution comprises 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. The UV exposure during UV primary curing and UV secondary curing is 1500 mj / cm 2 Among them, the trifunctional UV crosslinker is pentaerythritol triacrylate, and the UV initiator is isopropylthioxanthone ITX1105.

[0100] Example 4 This embodiment 4 is substantially the same as embodiment 1, except that the UV resin solution includes the following raw materials in parts by weight: 100 parts of UV glue, 3 parts of a tetrafunctional UV crosslinking agent, and 4 parts of a UV initiator. The UV exposure during the UV primary curing and UV secondary curing is 1000 mj / cm 2 Among them, the tetrafunctional UV crosslinker is pentaerythritol tetraallyl ether, and the UV initiator is 1-hydroxycyclohexyl phenyl ketone (PI-184).

[0101] Example 5 This embodiment 5 is substantially the same as embodiment 1, except that the UV resin solution includes the following raw materials in parts by weight: 100 parts of UV glue, 5 parts of bifunctional UV crosslinking agent, 4 parts of trifunctional UV crosslinking agent, 3 parts of tetrafunctional UV crosslinking agent, and 3 parts of UV initiator. The UV exposure during UV primary curing and UV secondary curing is 2000 mj / cm 2 Among them, the bifunctional UV crosslinker is polyurethane modified diacrylate oligomer (DOUBLEMER® 5222), the trifunctional UV crosslinker is pentaerythritol triacrylate, the tetrafunctional UV crosslinker is tetrafunctional polyester acrylate (ETERCURE 6325-100), and the UV initiator is diphenyl-(2,4,6-trimethylbenzoyl)phosphine oxide (TPO).

[0102] Example 6 This embodiment 6 is substantially the same as the embodiment 1, except that in the raw material composition of the high surface energy ink A, the amount of the first curing agent added is 10 parts.

[0103] Example 7 The present embodiment 7 is substantially the same as the embodiment 1, except that: in the raw material composition of the foam layer 5, the amount of elastic particles added is 2 parts.

[0104] Example 8 The present embodiment 8 is substantially the same as the embodiment 1, except that: in the raw material composition of the foam layer 5, the amount of elastic particles added is 3 parts.

[0105] Example 9 The present embodiment 9 is substantially the same as the embodiment 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 amount of the elastic particles added is 3 parts.

[0106] Example 10 The present embodiment 10 is substantially the same as the embodiment 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 amount of the elastic particles added is 2 parts.

[0107] Embodiment 11 This embodiment 11 is substantially the same as the embodiment 1, except that the thickness of the anti-stick coating 6 is 9 μm.

[0108] Example 12 This embodiment 12 is substantially the same as the embodiment 1, except that the thickness of the anti-stick coating 6 is 13.5 μm.

[0109] Comparative Example 1 Comparative Example 1 is a grid release film prepared by the existing lamination process, wherein the material of the grid layer of the grid release film is PE material.

[0110] Comparative Example 2 Comparative Example 2 is substantially the same as Example 1, except that in the raw material composition of the high surface energy ink A, the amount of the first curing agent added is 0 parts.

[0111] Comparative Example 3 Comparative Example 3 is substantially the same as Example 1, except that the high surface energy ink layer 4 is prepared from high surface energy ink B, and the high surface energy ink B comprises the following raw materials in parts by weight: 100 parts of ink and 0 parts of curing agent; wherein the color of the ink is black, the solid content is 31±2%, the viscosity is 10~14 seconds, the surface tension is 46dyne, the halogen in the ink is ≤400ppm, the adhesion of the ink (Bai Ge method) is 4B, and the main component of the ink is polyurethane resin; and the curing agent is isophorone diisocyanate.

[0112] Comparative Example 4 Comparative Example 4 is substantially the same as Example 1, except that the high surface energy ink layer 4 is prepared from high surface energy ink B, and the high surface energy ink B comprises the following raw materials in parts by weight: 100 parts of ink and 5 parts of curing agent; wherein the color of the ink is black, the solid content is 31±2%, the viscosity is 10~14 seconds, the surface tension is 46dyne, the halogen in the ink is ≤400ppm, the adhesion of the ink (by the grid method) is 4B, and the main component of the ink is polyurethane resin; and the curing agent is isophorone diisocyanate.

[0113] Comparative Example 5 Comparative Example 5 is substantially the same as Example 1, except that the high surface energy ink layer 4 is prepared from high surface energy ink B, and the high surface energy ink B comprises the following raw materials in parts by weight: 100 parts of ink and 10 parts of curing agent; wherein the color of the ink is black, the solid content is 31±2%, the viscosity is 10~14 seconds, the surface tension is 46dyne, the halogen in the ink is ≤400ppm, the adhesion of the ink (Bai Ge method) is 4B, and the main component of the ink is polyurethane resin; and the curing agent is isophorone diisocyanate.

[0114] Comparative Example 6 Comparative Example 6 is substantially the same as Example 1, except that the surface of the foam layer 5 does not have an anti-stick coating 6 .

[0115] Comparative Example 7 Comparative Example 7 is substantially the same as Example 1, except that the thickness of the anti-stick coating 6 is 1 μm.

[0116] Related performance tests 1): The components of the resin grid layer in Examples 1-5 are listed in Table 2.

[0117] Table 2 Composition of resin grid layer

[0118] The temperature resistance test of the grid release films prepared in Examples 1-5 was carried out, and the results are shown in Table 3: Table 3 Experimental results of temperature resistance of the grid release films prepared in Examples 1-5 and Comparative Example 1

[0119] Comparative Example 1 is a grid release film prepared by using an existing lamination process, wherein the material of the grid layer of the grid release film is a PE material.

[0120] It can be concluded from Table 3 that the resin grid layer and the entire grid release film prepared using the UV resin liquid of the present application are resistant to high temperatures and can remain unchanged at 90-150°C, thereby ensuring that the exhaust grooves formed on the pressure-sensitive adhesive layer are of uniform depth and that the exhaust and disappearance properties of the exhaust grooves are ensured.

[0121] 2): Experiment on the correlation between the physical dimensions of the grooved convex strips of the grid structure of the grid release film and the air venting and disappearance properties of the air venting of the pressure-sensitive adhesive layer.

[0122] Next, we further discuss the correlation between the physical dimensions (such as depth and width) of the grooved convex strips and the node structure dimensions on the air venting and vanishing properties of the air vents formed on the pressure-sensitive adhesive layer: taking the circumscribed circle diameter of the node structure 133, the depth of the grooved convex strips 132 and the width of the grooved convex strips 132 as variables, and other conditions being the same (such as the use of hexagonal grids, the same composition and thickness of the UV resin grid layer, the same substrate layer material, etc.), to discuss the correlation between the physical dimensions of the grooved convex strips and the air venting and vanishing properties of the air vents, that is, to conduct an orthogonal correlation experiment (the influencing factors are shown in Table 4), and the orthogonal experiment results are shown in Table 5: Table 4: Influencing factors and solutions

[0123] Table 5 Orthogonal experiment results

[0124] Note: Both the exhaust effect and the disappearing effect need to be made into tape products for performance testing. This orthogonal experiment is conducted 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 from bottom to top) for comparative evaluation. The evaluation criteria are shown in Table 6: Table 6 Evaluation criteria for the venting effect and disappearing effect of the venting groove of the pressure-sensitive adhesive layer

[0125] Note: The mesh pattern here refers to the grid-like exhaust grooves.

[0126] Among them, (1): Exhaust test: Place the prepared grid single-sided tape in an environment with a temperature of 23±2℃ and a humidity of 65±5%, and cut the foam tape into a size of 50mm×50mm. Then stick the adhesive layer of the tape on the glass plate, and press the bubble in the middle of the tape clockwise with your fingers to check its exhaust speed and whether it can be exhausted.

[0127] (2): Disappearance test: Cut the prepared grid single-sided tape into a size of 50×50mm. Tear off the grid release film on the tape, and stick the grid adhesive surface flat on the white glass; roll back and forth with a 2kg rubber roller 3 times (speed 25mm / sec). Place the pasted sample at room temperature, use LED light and a magnifying glass to observe the disappearance of the mesh pattern every 1hr, and record the disappearance time (observe all positions, and record the disappearance time after confirming that the mesh pattern has completely disappeared).

[0128] Therefore, from the orthogonal experimental results - Table 5, we can conclude that: the depth (height) of the groove convex strip is 5-10um; the width of the groove convex strip is 19-25um; the node structure size formed by the intersection of the groove convex strips is less than or equal to 30um (that is, in the range of 15~30μm), which is the best range. Within this range, when the exhaust groove transferred to the surface of the pressure-sensitive adhesive is actually attached to the adhered object, the bubbles in the exhaust groove can be discharged and the exhaust groove can completely disappear.

[0129] More preferably, when the depth of the grooved convex strip is 5μm, the width of the grooved convex strip is 19μm, and the diameter of the circumscribed circle of the node structure is 25μm, the best exhaust effect and disappearance effect are achieved; or, when the depth of the grooved convex strip is 8μm, the width of the grooved convex strip is 25μm, and the diameter of the circumscribed circle of the node structure is 15μm, the best exhaust effect and disappearance effect are achieved; or, when the depth of the grooved convex strip is 10μm, the width of the grooved convex strip is 22μm, and the diameter of the circumscribed circle of the node structure is 15μm, the best exhaust effect and disappearance effect are achieved. Combined with the hexagonal grid and the UV resin grid layer, the prepared grid release film can have the characteristics of not deforming at high temperature, the bubbles in the exhaust groove transferred to the pressure-sensitive adhesive layer can be quickly discharged, and the disappearance effect can also be achieved.

[0130] Three): The high surface ink layer 4 prepared in Example 1, Example 6, and Comparative Examples 2-5 were respectively tested for surface tension, adhesion to the printing layer 3, and adhesion to the foam layer 5: the results are shown in Table 7.

[0131] Among them, surface tension test: test is carried out according to the standard dyne pen.

[0132] Adhesion test of the printed layer 3: Place the sample to be tested with the high surface ink layer 4 facing upwards, and then stick the 3M600 tape on the surface of the high surface energy ink layer 4 of the sample to be tested. Roll the 2kg roller back and forth once to ensure that the 3M600 tape is evenly attached. Peel it off quickly at a speed of ≥20cm / S to observe the ink shedding.

[0133] The adhesion test of the foam layer 5 is also carried out in accordance with the above method.

[0134] Table 7 Surface tension and adhesion test results of high surface ink layers of various embodiments and comparative examples

[0135] IV): The effects of the particle size and addition ratio of the elastic particles of the foam layer 5 with a thickness of 100 um prepared in the above embodiments on the cushioning force and roughness are discussed: the influencing factors are shown in Table 8 below, and the experimental results are shown in Table 9.

[0136] Among them, the impact absorption rate test includes: 1) taking the sample to be tested, the size is 75mm×75mm, and sticking it on a 0.7mm thick 75mm×75mm glass plate; 2) taking a 4.3g steel ball, adjusting the height of the steel ball to 10.1cm, the steel ball is magnetically adsorbed, and the platform below the steel ball is stainless steel with a sensor to test the initial impact force. In order to reduce the equipment error, it is necessary to test 3 groups of point impact blank tests as a control group to ensure that the values ​​of the 3 groups of blank tests are similar and take the average value to finally get the initial impact force; 3) After the blank test is completed, the glass plate with the sample to be tested is placed with the glass side facing down and the foam side facing up in the middle of the stainless steel platform to test the point impact force. After 3 tests, 3 groups of point impact force values ​​are obtained and the average value is taken to get the impact force II; 4) According to the formula: ((initial impact force-impact force II) / initial impact force)×100%, the point impact absorption rate is calculated.

[0137] Roughness test: including, 1) place the sample to be tested in an environment of 23±2℃ for more than 20 minutes, and cut the sample to be tested into 50mm×250mm; 2) connect the probe of the surface roughness tester and turn on the test instrument. After turning on, it will display "0.000μm", take out the calibration board for calibration, place the probe on the calibration board, make sure the test value is within the specified range, and complete the calibration. Note that the calibration board is placed on a horizontal table during calibration; 3) place the sample to be tested on the test pad with the test surface facing up, place the test instrument on the sample to be tested, and start the test; 4) repeat step 3), and take three different test points on the test surface of the sample to be tested for testing, and take the average value of the obtained values.

[0138] Table 8 Influencing factors of elastic particles

[0139] Table 9 Orthogonal experiment results

[0140] The overall design should take into account the impact absorption rate and appearance. Comprehensive consideration should be given to the data of experimental groups 4-6.

[0141] Therefore, it can be seen from the above Tables 8-9 that the foam layer 5 prepared in the above embodiments, especially in Embodiment 1 and Embodiments 7-10, has a suitable impact absorption rate and roughness.

[0142] V): The anti-sticking condition of the anti-sticking coating 6 prepared in Example 1, Examples 11-12, and Comparative Examples 6-7, the adhesion of the anti-sticking coating to the copper foil after the copper foil tape is attached, and the roughness of the prepared anti-sticking coating are tested respectively. The results are shown in Table 10 below: Table 10 Anti-sticking condition, copper foil adhesion and roughness test results of anti-stick coating 6

[0143] From Table 10, it can be determined that the thickness of the anti-stick coating 6 is 4.5-13.5um, which has good roughness and high adhesion with the copper foil tape (functional layer 7). Since the prepared anti-stick coating has no adhesion, the foam tape can be stored for a long time. Furthermore, from Table 10, we can also see that the thickness of the anti-stick coating 6 affects the roughness, anti-sticking and copper foil adhesion performance, among which the best anti-stick coating thickness is about 9um.

[0144] The copper foil adhesion test: the adhesive layer of the composite tape is attached to the middle part of the steel plate, and then rolled three times with an electric rolling roller at a speed of 300mm / min. The traction tape is attached to the non-test surface of the copper foil tape to obtain the test sample; after the treated sample is placed in an environment of 23±2℃ for 20 minutes, the steel plate is mounted on the mobile fixture of the tensile machine, the traction tape is fixed on the fixed fixture, and peeled off at an angle of 180° and a speed of 300mm / min to test the adhesion between the anti-stick coating and the copper foil tape.

[0145] The roughness is tested according to the above method.

[0146] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps recorded in the present disclosure can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solutions disclosed in the present disclosure can be achieved, and this document is not limited here. In addition, the terms "first" and "second" are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present disclosure, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. The above is only a specific embodiment of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any technician familiar with the technical field can easily think of changes or replacements within the technical scope disclosed in the present disclosure, which should be covered within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be based on the protection scope of the claims.

Claims

1. A foam tape, characterized in that: It includes a grid release film, a glue layer, a printing layer, a high surface energy ink layer and a foam layer which 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 to 10 parts of a first curing 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, 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 claim 1, characterized in that: 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 top corners of the hexagonal grids to form a node structure, and the diameter of the circumscribed circle of the node structure is 15 to 30 μm.

6. The foam tape according to claim 5, characterized in that: The depth of the groove convex strip is 5-10 μm, and the width of the groove convex strip is 19-25 μm.

7. The foam tape according to claim 5, characterized in that: 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 to 12 parts of UV cross-linking agent, and 3 to 4 parts of UV initiator; wherein the UV cross-linking agent is a mixture of one or more of a bifunctional UV cross-linking agent, a trifunctional UV cross-linking agent, and a tetrafunctional UV cross-linking agent.

8. The foam tape according to any one of claims 1 to 7, 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.

9. The foam tape according to claim 8, 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.

10. The foam tape according to claim 9, 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, and a main component of polyurethane resin; The second curing agent is an isocyanate curing agent.

11. A composite tape, characterized in that: The foam tape comprises the foam tape according to any one of claims 1 to 10, 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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