A novel filling function swelling adhesive tape and a preparation method thereof

Abstract

The present application belongs to the technical field of swelling adhesive tape, and specifically discloses a novel filling function swelling adhesive tape and a preparation method thereof. The novel filling function swelling adhesive tape comprises, from outside to inside, a substrate layer, a swelling base layer, a vacuum plating layer and a pressure-sensitive adhesive layer. The swelling base layer is made by transferring and coating a high-molecular resin composition on the substrate layer. The vacuum plating layer is composed of a plurality of support units in a dot distribution, and is formed on the surface of the swelling base layer by vacuum plating of inorganic compounds. The pressure-sensitive adhesive layer is transferred and coated on the surface of the vacuum plating layer. The present application prevents deformation of the substrate by transfer printing, ensures uniform thickness of the substrate layer, and expands the selection range of the substrate layer. By combining low-temperature evaporation of pure oil ink and fine dot pattern gravure printing with vacuum plating of inorganic compounds, incomplete plating is realized, a dot-shaped plating layer is formed, and the problem of dissolution and shrinkage of the base layer is avoided. Compared with the prior art, the present application is more flexible, efficient and accurate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of swelling adhesive tape, in particular to a novel filling function swelling adhesive tape and a preparation method thereof. BACKGROUND

[0002] When the battery is assembled, there will be a gap between the cell and the shell. The existence of the gap will cause the cell to move when subjected to external impact, affecting the normal operation of the battery, and there is a safety hazard. Therefore, a swelling adhesive tape is usually used between the cell and the shell to fill the gap. The swelling adhesive tape generally comprises a substrate layer, a pressure-sensitive adhesive layer and a swelling layer arranged between the two. The swelling layer swells and expands in volume after being heated or contacted with electrolyte, thereby filling the gap and fixing the battery.

[0003] The traditional swelling adhesive tape has the following defects: first, the swelling layer is coated on the substrate layer by a mesh roller. The substrate needs to be heated by an oven. After heating, it is easy to deform, resulting in poor thickness uniformity of the finished product. Therefore, a high-temperature-resistant substrate is required, which has high requirements for the material of the substrate layer and limits the market application. Second, the resin of the swelling layer will be dissolved and corroded after being contacted with some acidic or alkaline substances in the electrolyte, resulting in local shrinkage of the swelling layer and difficulty in achieving the expected swelling rate, which cannot achieve tight filling. At present, there is a countermeasure of setting a support layer between the swelling layer and the pressure-sensitive adhesive layer. The support layer is a PE film containing titanium white powder coated on the surface of the swelling layer. The good mechanical properties (strength and hardness) of titanium white powder are used to support the swelling layer, avoiding the problem of shrinkage of the swelling layer due to dissolution. This method can effectively improve the performance of the adhesive tape, but it is time-consuming and will greatly reduce the production efficiency. SUMMARY

[0004] To solve the above problems, one of the purposes of the present application is to provide a novel filling function swelling adhesive tape with high swelling rate and uniform thickness.

[0005] To achieve the above purposes, the specific technical solutions adopted by the present application are as follows:

[0006] A novel filling function swelling adhesive tape, from outside to inside, comprises a substrate layer, a swelling base layer, a vacuum plating layer and a pressure-sensitive adhesive layer. The swelling base layer is made by transferring and coating a high molecular resin composition on the substrate layer. The vacuum plating layer is composed of a plurality of support units in a dot distribution and is formed on the surface of the swelling base layer by vacuum plating of inorganic compounds. The pressure-sensitive adhesive layer is transferred and coated on the surface of the vacuum plating layer.

[0007] Unlike the existing swelling adhesive tape, the swelling substrate layer of the present application is formed by transfer printing on the substrate layer, instead of the original substrate layer web roll coating method, and the heating in the oven is completed on the release paper, avoiding the heating deformation of the substrate layer, expanding the selection range of the substrate layer while ensuring the uniform thickness of the substrate layer: the thickness uniformity of the swelling adhesive tape as a whole is improved from millimeter level to micrometer level, thereby greatly improving the filling accuracy of the lithium battery gap, and the filling accuracy reaches micrometer level; the substrate layer can not only select high-strength and high-temperature-resistant materials (such as PET, PA, PI, PC, PS, etc.), but also select soft and non-high-temperature-resistant materials (such as PE, CPP, EVA, PP, etc.), greatly expanding the application range.

[0008] And for the shrinkage problem of the substrate layer in the prior art, the present application solves it through structural combination and process innovation. Specifically, the present application is provided with a net dot shaped plating layer on the surface of the swelling substrate layer by vacuum plating, each net dot being a support unit, playing a supporting role for the swelling substrate layer and a barrier role for the electrolyte, and the interval between the support units provides space for the electrolyte to penetrate into the swelling substrate layer to make it swell. When the support unit locally dissolves after the swelling substrate layer contacts with the electrolyte, it plays a role similar to that of a reinforced structure, suppressing the shrinkage trend of the swelling substrate layer when it dissolves, ensuring the structural stability, maintaining a high swelling rate, and avoiding the problem that the swelling substrate layer cannot be tightly filled due to the gap caused by shrinkage. As can be seen, unlike the prior art of coating a whole layer of PE film containing titanium white powder, the present application is an incomplete plating, thus forming a partition structure (barrier area and penetration area), which has obvious advantages compared with the existing uniform coating structure: the relative area of the barrier area and the penetration area can be adjusted to artificially design the penetration rate of the electrolyte, meeting the diversified swelling needs. The adjustment of the relative area depends on the vacuum plating process used in the present application. As long as different offset printing patterns are designed to change the size and distribution of the net dots during vacuum plating, the process can be realized, which is more efficient, has higher processing precision, and is more flexible compared with the coating process used in the prior art.

[0009] Preferably, the thickness of the vacuum plating layer is < 80 nm, and the plating area of the vacuum plating layer on the surface of the swelling substrate layer is < 80%. The plating area is the coverage area of the support unit on the surface of the swelling substrate layer. The thickness of a normal surface complete vacuum plating film is 100-450 nm, while the present application is an incomplete plating with a plating area of less than 80%, and the thickness of the plating layer is controlled to be less than 80 nm, forming an ultra-thin net dot shaped plating layer that can support and not completely block the electrolyte (acid and alkali solution), providing space for the electrolyte to penetrate, and the swelling substrate layer does not shrink after being dissolved and can maintain a swelling rate of ≥ 130%. Of course, in some cases, the product needs very small swelling rate, and the swelling adhesive tape with such special design requires that the thickness of the vacuum plating layer is not more than 400 nm.

[0010] Preferably, the support units are evenly distributed in the form of net points to ensure the uniformity of the swelling of the base layer.

[0011] Preferably, the inorganic compound is a metal oxide or sulfide, and is specifically selected from substances with high mechanical properties, such as titanium oxide, aluminum oxide, silicon oxide, silicon dioxide, zinc sulfide, etc.

[0012] Preferably, the high-molecular resin composition is at least mixed from the following raw materials: thermoplastic polyurethane resin (TPU), thermosetting polyurethane resin, and curing agent. For example, in the battery electrolyte at 85℃, the mixed resin of TPU and EVA reacts with the curing agent to form an expanded body with expanded area and volume to realize gap filling. The curing agent can be polyurethane, butanol-modified isocyanate, m-phenylenediamine, diamine-based diphenyl methane, etc. In addition to the thermoplastic polyurethane resin, thermosetting polyurethane resin, and curing agent, according to the functional requirements of the actual product, optional additives such as defoaming agent, leveling agent, antistatic agent, defoaming agent, tackiness thickening agent, wetting tension regulator, etc. can also be added.

[0013] Preferably, the thermosetting polyurethane resin is a composition of polyol and polyisocyanate. The equivalent ratio of the hydroxyl group (OH) of the polyol to the isocyanate group (NCO) of the polyisocyanate is basically 1:1, but in actual application, the specifications of the battery are various, and the gap with the shell is also different, so different swelling rates of the adhesive tape are required, and therefore the equivalent ratio can also be changed according to the different swelling strain requirements. The raw material selection and amount of the thermosetting polyurethane resin can be adjusted according to the different swelling requirements, and the application market is wide. More specifically, the polyol can be one or more of dipropylene glycol, neopentyl glycol, alkylene glycol, dialkylene glycol, benzenediol (o-dihydroxybenzene, m-dihydroxybenzene, p-dihydroxybenzene), benzene triol (1,2,3-benzene triol), diol amine, triol amine, arabitol, mannitol, isomaltitol, glycerol, xylitol, sorbitol, maltitol, erythritol, ribitol, dulcitol, lactitol, threitol, iditol, polysaccharide alcohol, etc. The alkylene contained in the polyisocyanate in the alkylene or dialkylene glycol can include alkylene containing 1 to 20 carbon atoms, 1 to 16 carbon atoms, 1 to 12 carbon atoms, 1 to 8 carbon atoms, 1 to 4 carbon atoms.

[0014] Preferably, the material of the pressure-sensitive adhesive layer is acrylic pressure-sensitive adhesive.

[0015] The second purpose of the present application is to provide a more specific preparation method of the above-mentioned novel filling function swelling adhesive tape, comprising the following steps:

[0016] S1. Using a transfer coating machine to coat a solution of a polymer resin composition on the surface of a release film as a swelling base layer, drying the film through an oven and transferring it to the substrate layer to be wound into a roll film;

[0017] S2. Using a vacuum plating and offset printing integrated machine, placing the roll film in the vacuum and offset printing integrated chamber, offset printing a pure oil ink on the designed fine dot pattern, the pure oil ink being an oil substance with a melting point lower than 100℃ (a melting point that is too high is easy to cause the base layer to deform, and a conventional water-based ink is easy to cause evaporation residue, and a single component water solution printing is easy to cause diffusion and cause the pattern to be blurred); then using an inorganic compound as the plating material to perform vacuum plating on the surface of the roll film after offset printing to form a vacuum plating layer;

[0018] Under normal conditions, the inorganic compound placed at the bottom of the vacuum chamber is heated and melted by a large current to evaporate, and the temperature control range is different according to the melting point of the inorganic compound, for example, the evaporation temperature of silicon oxide is 1200-1600℃, the evaporation temperature of zinc sulfide is 10 -2 The evaporation temperature of the pure oil ink is 1200℃ under a vacuum degree of 10 Pa, and the pure oil ink can be evaporated by the residual heat of the inorganic compound.

[0019] S3. Using a transfer coating process to coat a transfer pressure-sensitive adhesive on the surface of the vacuum plating layer to form a pressure-sensitive adhesive layer;

[0020] S4. According to the specified size of the product, the roll cutting and packaging are completed.

[0021] Preferably, in step S2, the pure oil ink is a soybean ink with 100% soybean oil as the component, which can be completely evaporated and is inexpensive.

[0022] Preferably, in step S2, the distance between the pure oil ink evaporation unit and the inorganic compound evaporation unit in the vacuum and offset printing integrated chamber is 45-55 cm, and is further preferably 50 cm. If the distance is too large, the pure oil ink is easy to solidify and cannot be effectively evaporated, and if the distance is too small, the substrate film is easy to deform.

[0023] The new type of filling function swelling adhesive tape prepared according to the above method has the main characteristics of preventing the substrate from deforming by transfer and controlling the swelling strain function by plating, and is a combination of a transfer coating process, an ultra-thin plating layer, and a vacuum plating process according to an offset printing dot pattern. The special vacuum plating process is used to combine the low-temperature evaporation of a pure oil ink offset printing fine dot pattern and inorganic vacuum plating to achieve incomplete plating, and the principle is as follows: during the vacuum plating process, when the evaporated inorganic compound hot vapor falls by gravity, it approaches the surface of the pure oil ink at the printed pattern, the pure oil ink is evaporated by the residual heat to become steam, effectively preventing the formation of a plating layer at the position, so that only the position without the printed ink has a plating layer, and finally a fine dot plating pattern of the inorganic compound is formed.

[0024] It is known that the special vacuum plating process adopted by the present application has significant technical innovation in the adhesive tape industry, which breaks through the thinking limitations of a single industry and combines ink printing and vacuum plating in one. In the plating industry, ink printing is generally used to form decorative patterns, and vacuum plating is rarely applied, even if it is applied, it is to plate an entire layer of film, and the two technologies are obviously separate means, and the present application creatively combines the two to achieve dot plating. The final purpose of such dot design and process implementation is to serve as a control swelling adhesive tape deformation and to achieve a supporting role. More specifically, the present application adopts an ink printing process and selects pure oil ink for offset printing. Unlike the traditional use of water-based ink printing to form decorative patterns, the present application uses the low-temperature evaporation characteristics of pure oil ink as a barrier medium and a barrier plating layer material. It goes through a process from nothing to something and then to nothing on the substrate layer. Whether it is from ink selection or mechanism, it is different from traditional printing. At the same time, the present application combines vacuum plating process with pure oil ink printing. Compared with the evaporation of plating material in conventional vacuum plating process, the present application involves the relative hindering evaporation of two types of substances, plating material and pure oil ink, which is obviously more difficult to control. In the vacuum plating process, the relative distance and temperature control of the two evaporation units must be done well to enable the two to smoothly and synchronously undergo relative evaporation. Thus, the present application successfully combines ink printing and vacuum plating to plate the dot-shaped plating layer of the present application.

[0025] The present application has the following beneficial effects:

[0026] 1. The swelling substrate layer is formed by transfer printing coating on the substrate layer, replacing the original substrate layer web roll coating method, avoiding the heating deformation of the substrate layer, ensuring the uniformity of the thickness of the substrate layer, improving the uniformity from millimeter level to micrometer level, achieving micrometer level filling precision of lithium battery gap, expanding the selection range of the substrate layer, and greatly expanding the application range of the product.

[0027] 2. The dot-shaped plating layer is formed by incomplete vacuum plating of inorganic compounds, which simultaneously realizes the supporting effect on the swelling substrate layer and provides the infiltration space for the electrolyte, avoids the problem of dissolution and shrinkage of the substrate layer, controls the plating area to be less than 80%, controls the plating layer thickness to be less than 80 nm, and ensures that the adhesive tape can maintain a swelling rate of ≥130% of the area, ensuring the tight filling of the gap during use.

[0028] 3. The present application adopts a special vacuum plating process, uses low-temperature evaporation of pure oil ink offset printing micro-dot pattern and vacuum plating of inorganic matter to realize incomplete plating. Through the design of the offset printing pattern, the penetration efficiency of the electrolyte can be artificially adjusted. Compared with the existing technology of forming a whole layer of PE film containing titanium white powder by coating process, the present application has structural and process innovation, can meet the diversified swelling needs, is more flexible, has higher efficiency and higher processing precision, and has obvious advantages.

[0029] 4. This invention combines transfer coating process with special vacuum coating process, which not only improves product performance but also expands the scope of application. It can meet the needs of products with different swelling rates and different mechanical properties and can be applied to industries such as home appliances, automobiles, machinery, instruments, batteries, and decoration. Specifically, it can be used for gap filling in home appliances, automobiles, lithium batteries, instruments, and various mechanical parts under specific environments. Attached Figure Description

[0030] Figure 1 : A schematic diagram of the structure of the novel filling-functional swelling tape of the present invention.

[0031] Figure 2 : A schematic diagram of the vacuum coating structure in the novel filling functional swelling tape of this invention.

[0032] Figure 3 : Schematic diagram of the integrated vacuum and offset printing chamber of this invention.

[0033] In the figure, 1-substrate layer, 2-swollen base layer, 3-vacuum plating layer, 4-pressure-sensitive adhesive layer, 5-cavity, 6-ink tank, 7-plating material tank, 8-heating module, 9-rubber roller; 31-support unit, 32-ink printing area. Detailed Implementation

[0034] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0035] Example 1

[0036] A novel type of filling-functional swelling tape, such as Figure 1 As shown, from the outside in, it includes a substrate layer 1, a swollen base layer 2, a vacuum-plated layer 3, and a pressure-sensitive adhesive layer 4; the substrate layer 1 is a 30μm thick PET film layer; the swollen base layer 2 is formed by transferring a polymer resin composition onto the substrate layer 1, and has a thickness of 5μm; the vacuum-plated layer 3 is composed of a plurality of support units 31 with uniformly distributed dots (e.g., ...). Figure 2 As shown, the vacuum coating layer 3 is formed on the surface of the swollen substrate layer 2 by an inorganic compound through a vacuum coating process. The thickness of the vacuum coating layer 3 is 75 nm and the coating area is 70%. The pressure-sensitive adhesive layer 4 is an acrylic pressure-sensitive adhesive layer with a thickness of 8 μm, which is formed on the surface of the vacuum coating layer 3 by a transfer coating process.

[0037] The specific preparation method of the novel filling-functional swelling tape is as follows:

[0038] S1. Preparation of the swollen base layer 2 by transfer coating:

[0039] a. Preparation of high molecular resin composition solution: the high molecular resin composition is mixed by thermoplastic polyurethane resin, thermosetting polyurethane resin, curing agent and defoaming agent; specifically, the thermosetting polyurethane resin is a composition of polyol and polyisocyanate, the equivalent ratio of hydroxyl (OH) of the polyol to isocyanate group (NCO) of the polyisocyanate is 1:1; the polyol is dipropylene glycol which can improve the flexibility and corrosion resistance of the modified polyurethane adhesive and neopentyl glycol which can improve the corrosion resistance, especially the alkali resistance and hydrolysis resistance of the modified polyurethane adhesive, the polyisocyanate is toluene diisocyanate (TDI) and trimethyl ethane diisocyanate (TMDI), the curing agent is m-phenylenediamine and diamine-based diphenyl methane, and the defoaming agent is purchased from Henkel, Germany;

[0040] b. Using a transfer coating machine, the solution of the high molecular resin composition is coated on the surface of the PET release film with a width of 1250 mm as a swelling base layer 2; after drying through an oven, the film is transferred to the substrate layer 1 and wound, the width of the transferred base layer resin is 1220 mm, the coating thickness is 5 μm, and the wound film is obtained (the transfer coating process parameters are controlled as follows: the oven temperature is set at 95-110 ℃, the transfer machine speed is set at 80-150 m / min, and in this embodiment, the oven temperature is set at 100 ℃ and the transfer machine speed is set at 100 m / min);

[0041] S2. Using a vacuum plating and offset printing integrated machine, the offset printing and film plating of the entire dot design pattern on the swelling base layer 2 are performed: the wound film is placed in the vacuum and offset printing integrated chamber, the designed micro-dot pattern is offset printed with soybean ink containing 100% soybean oil, the offset printing width is 1230 mm, and the ink printing area 32 is as shown in Figure 2 Then, the vacuum plating layer 3 is formed by vacuum plating inorganic compound titanium oxide on the surface of the offset printed wound film (the vacuum plating film process control parameters are as follows: the wetting tension of the base layer resin surface is detected to be greater than or equal to 38 N / M; the plating machine speed is set at 180-300 m / min; the dry ink thickness of the offset printing is less than or equal to 2 μm, and the dot is 0.1 mm, and in this embodiment, the plating machine speed is set at 200 m / min and the dry ink thickness of the offset printing is set at 2 μm);

[0042] S3. Using a transfer coating process, the transfer acrylic pressure sensitive adhesive is coated on the surface of the vacuum plating layer to form a pressure sensitive adhesive layer 4, and the adhesive layer thickness is 8 μm;

[0043] S4. The product is cut into rolls and packaged according to the specified size.

[0044] The structure of the vacuum and offset printing integrated chamber in step S2 of the present application is shown in Figure 3As shown, including the cavity 5 and disposed in the cavity 5 ink tank 6 and plating tank 7; the ink tank 6 is loaded with pure oil ink, ink tank 6 is provided with rubber roller 9; the plating tank 7 is loaded with inorganic compound powder, plating tank 7 bottom is provided with heating module 8. After completing the transfer coating film into the cavity 5, first through the rubber roller 9 in the surface with pure oil ink printing grid pattern; then the film is transported to the plating tank 7 above, heating module to the plating tank 7 heating, inorganic compounds evaporate, the film above the plating tank 7 is also evaporated by the residual heat pure oil ink, forming two evaporation unit, the distance between the two evaporation unit (i.e. the distance between the plating tank 7 and the film) is 50 cm; pure oil ink vapor hinder its position plating layer, thus successfully forming the grid pattern on the film plating layer, finally transport winding.

[0045] Example 2

[0046] A new type of filling function of the swelling tape, from the outside to the inside including the substrate layer 1, swelling base layer 2, vacuum plating layer 3 and pressure sensitive adhesive layer 4, the most important difference with example 1 is the use of different material substrate layer 1. Specifically, the substrate layer 1 is a PE film layer with a thickness of 30 μm; the swelling base layer 2 is made by transfer coating of high molecular resin composition on the substrate layer 1, with a thickness of 5 μm; the vacuum plating layer 3 is composed of a plurality of support units 31 uniformly distributed in grid points, which is formed by vacuum plating process of inorganic compound on the surface of the swelling base layer 2, the thickness of the vacuum plating layer 3 is 75 nm, and the plating area is 70%; the pressure sensitive adhesive layer 4 is an acrylic pressure sensitive adhesive layer with a thickness of 10 μm, which is formed on the surface of the vacuum plating layer 3 by transfer coating process.

[0047] The preparation method of the new type of filling function of the swelling tape is as follows:

[0048] S1. transfer coating to prepare the swelling base layer 2:

[0049] a. preparation of high molecular resin composition solution: same as example 1;

[0050] b. using transfer coating machine, coating the solution of high molecular resin composition on the surface of the Grasen release film with a width of 990 mm as the swelling base layer 2; after drying through the oven, film is formed, and then transferred to the substrate layer 1 and wound up; the width of the transferred base layer resin is 970 mm, the coating thickness is 5 μm, and the wound film is obtained (the transfer coating process parameters are controlled as follows: the oven temperature is set at 95-110 ℃, and the transfer machine speed is set at 50-80 m / min; in this embodiment, the oven temperature is set at 100 ℃ and the transfer machine speed is set at 60 m / min);

[0051] S2. Using the vacuum plating and offset printing integrated machine, performing offset printing and plating of the entire dot design pattern on the swelling base layer 2: placing the film in the vacuum and offset printing integrated chamber, offset printing the designed fine dot pattern with soybean ink composed of 100% soybean oil, offset printing width 970 mm; then vacuum plating the surface of the offset printed film with titanium oxide as the plating material, forming a vacuum plating layer 3 (vacuum plating process control parameters are as follows: the wetting tension of the resin surface of the base layer is ≥38 N / M; the plating machine speed is set at 80-120 m / min; the ink offset printing dry ink thickness is ≤2 μm, and the dot is 0.12 mm, and in this embodiment, the plating machine speed is set at 100 m / min and the offset printing dry ink thickness is set at 2 μm) ;

[0052] S3. Using a transfer coating process, coating a transfer acrylic pressure-sensitive adhesive on the surface of the vacuum plating layer to form a pressure-sensitive adhesive layer 4, with a glue layer thickness of 10 μm;

[0053] S4. Cutting into rolls and packaging according to the specified size of the product.

[0054] Example 3

[0055] A new type of filling function swelling adhesive tape, which is basically the same as example 1, the difference is that in this embodiment, the inorganic compound used for vacuum plating is zinc sulfide.

[0056] Example 4

[0057] A new type of filling function swelling adhesive tape, which is basically the same as example 1, the difference is that in this embodiment, the size of the vacuum plating layer 3 is different from example 1, specifically as follows: the thickness of the vacuum plating layer 3 is 60 nm, and the plating area is 60%.

[0058] The following performance tests are performed on examples 1-4:

[0059] (1) Deformation measurement

[0060] a. Measurement method: measuring the change in parallelism before and after immersion in electrolyte, specifically taking a 5 cm*5 cm*45 μm swelling adhesive tape, and actually recording the initial thickness data; then immersing the swelling adhesive tape in a wide-mouth bottle containing electrolyte at room temperature, sealing the cap, and detecting the bending deformation of the swelling adhesive tape after 24 hours of sealing.

[0061] b. Test results: the bending deformation of examples 1-4 is within 1%.

[0062] (2) Swelling rate measurement

[0063] a. Measurement method: refer to the national standard "GB-7763-87 Swelling Index of Vulcanized Rubber Determination Method", only change the weight ratio in the method to the volume (length * width * thickness); change the weight ratio (swelling index) to the volume ratio (swelling rate). The specific steps are as follows: take a piece of 5cm*5cm*(45μm±0.005) swelling tape, and record the initial length, width and thickness data; then immerse the swelling tape in a wide-mouth bottle containing electrolyte at room temperature, seal the bottle with a cap, and detect the length, width and thickness data of the swelling tape after sealing for 24 hours; finally, calculate according to the following formula: swelling rate = (volume after immersion / volume before immersion) * 100%.

[0064] b. Test results: the swelling rates of examples 1-4 are all in the range of 140-150%.

[0065] Comparative example 1

[0066] In this comparative example, the conventional soybean ink (specifically, a purchased multi-component water-based soybean ink containing resin, filler and solvent) is used to replace 100% soybean oil in step S3 of example 1 for offset printing. The result is that the soybean ink cannot be completely evaporated, there is residual, and the penetration zone between the support units 31 cannot be successfully formed.

[0067] Comparative example 2

[0068] In this comparative example, the extracted soybean oil (the content of the extracted soybean oil prepared by extraction cannot reach 100%, and there are solvents and other impurities) is used to replace 100% soybean oil in step S3 of example 1 for offset printing. The result is that the extracted soybean oil cannot be completely evaporated, there is residual, and the penetration zone between the support units 31 cannot be successfully formed.

[0069] Comparative example 3

[0070] In this comparative example, micro-printing is used to replace the special vacuum plating process in step S3 of example 1 to form the support units 31 with dot distribution. The result is failure: on the one hand, the micro-printing film thickness is large, and it cannot reach the thickness level below 80nm, on the other hand, the inorganic compound cannot be completely stuck on the swelling substrate layer 2, the boundary of the dot pattern is not clear, and the frame is very blurred.

[0071] Comparative example 4

[0072] In this comparative example, a separate printing device and a vacuum plating machine are used to replace the vacuum plating and offset printing all-in-one machine in step S3. The result is that the dot pattern made is not neat, and there are burrs on the edge.

[0073] This specific embodiment is only an explanation of the present application, and is not a limitation of the present application. Any change made by a person skilled in the art after reading the specification of the present application, as long as it is within the scope of the claims of the present application, will be protected by the patent law.

Claims

1. A filled functional swelling tape, characterized by: From outside to inside, it includes substrate layer (1), swelling base layer (2), vacuum plating layer (3) and pressure sensitive adhesive layer (4). The swelling base layer (2) is made by transferring and coating a high polymer resin composition on the substrate layer (1). The vacuum plating layer (3) is composed of a plurality of support units (31) in dot distribution, and is formed by vacuum plating of inorganic compounds on the surface of the swelling base layer (2); the thickness of the vacuum plating layer (3) is less than 80 nm, and the plating area of the vacuum plating layer (3) on the surface of the swelling base layer (2) is less than 80%; the inorganic compounds are metal oxides or sulfides; the vacuum plating layer (3) is prepared by the following steps: A vacuum plating and offset printing integrated machine is used to place the roll film in a vacuum and offset printing integrated chamber, offset print pure oil ink on the designed fine dot pattern, and then vacuum plating on the surface of the offset printed roll film with inorganic compounds to form the vacuum plating layer (3); the pure oil ink is an oil substance with a melting point lower than 100℃ and a purity of 100%; the distance between the pure oil ink evaporation unit and the inorganic compound evaporation unit in the vacuum and offset printing integrated chamber is 45-55 cm; The pressure sensitive adhesive layer (4) is transferred and coated on the surface of the vacuum plating layer (3).

2. The filled functional swelling tape of claim 1, wherein: The support units (31) are uniformly distributed in dots.

3. The filled functional swelling tape of claim 1, wherein: The high polymer resin composition is at least mixed from the following raw materials: thermoplastic polyurethane resin, thermosetting polyurethane resin and curing agent.

4. The filled functional swelling tape of claim 3, wherein: The thermosetting polyurethane resin is a composition of polyol and polyisocyanate.

5. The filled functional swelling tape of claim 1, wherein: The material of the substrate layer (1) is PE, CPP, EVA, PP, PET, PA, PI, PC or PS.

6. The filled functional swelling tape of claim 1, wherein: The material of the pressure sensitive adhesive layer (4) is acrylic pressure sensitive adhesive.

7. The method of producing a filled functional swelling tape according to any one of claims 1 to 6, characterized by: The following steps are included: S1. Using a transfer coating machine, coat a solution of high polymer resin composition on the surface of the release film as the swelling base layer (2), dry the film through the oven, and then transfer and wind on the substrate layer (1) to become a roll film; S2. Using a vacuum plating and offset printing integrated machine, place the roll film in a vacuum and offset printing integrated chamber, offset print pure oil ink on the designed fine dot pattern; then vacuum plating on the surface of the offset printed roll film with inorganic compounds to form the vacuum plating layer (3); S3. Using a transfer coating process, coat and transfer pressure sensitive adhesive on the surface of the vacuum plating layer to form the pressure sensitive adhesive layer (4); S4. According to the specified size of the product, complete the slitting and winding and packaging.

8. The method for preparing the filling-functional swelling tape according to claim 7, characterized in that: In step S2, the pure oil ink is soybean ink with 100% soybean oil as the ingredient.

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