A room temperature non-adhesive double-sided tape, its preparation method and application

Abstract

The application discloses a room-temperature non-sticky double-sided adhesive tape and a preparation method and application thereof, and belongs to the technical field of adhesive tapes.The double-sided adhesive tape comprises a carrier film layer, a non-sticky layer, a base film layer, a hot-pressing layer and an optional cover film which are sequentially stacked; the non-sticky layer comprises a first polyolefin resin and an elastic material; the hot-pressing layer comprises a second polyolefin resin and an adhesion resin; the first polyolefin resin and the second polyolefin resin each comprise at least one of an alpha-olefin polymer resin and a modified polyolefin resin; the elastic material has a melt index of 1-100 g / 10 min under a load of 5.00 kg at a temperature of 190-230 DEG C; the room-temperature peeling force of the non-sticky layer and the carrier film layer is greater than the room-temperature peeling force of the hot-pressing layer and the cover film, but is less than the hot-pressing adhesion force of the hot-pressing layer. The double-sided adhesive tape basically maintains no stickiness at room temperature, and the cover film and the carrier film layer are smoothly peeled off before and after the hot-pressing adhesion of the hot-pressing layer through the difference in the adhesion force between the layers, so that problems, such as uneven adhesion of a traditional adhesive tape or peeling of the carrier film to take away electrode active materials, are effectively avoided.

Description

Technical Field

[0001] This invention relates to the field of lithium battery technology, particularly to tapes for lithium batteries, and especially to a room temperature non-adhesive double-sided tape, its preparation method, and its application. Background Technology

[0002] Lithium-ion batteries are widely used in mobile phones, laptops, wearable electronic devices, and energy storage devices due to their high energy density, multiple charge-discharge capability, long lifespan, and low pollution. In lithium-ion battery manufacturing, double-sided tape significantly improves battery safety, stability, and production efficiency through its bonding, sealing, and structural support functions, and is widely used. Using double-sided tape to protect tabs and solder joints to prevent short circuits and improve safety is currently one of the most important applications of double-sided tape. Tabs are typically fixed to the positive and negative current collectors of the battery using welding. If the welding areas of the tabs are not protected, weld slag and burrs can puncture the separator, causing internal short circuits. Furthermore, it can easily lead to lithium ion deposition at the tab welding areas, affecting battery performance. Currently, the protection of electrode tabs is mainly applied by hot-pressing adhesive tape. However, traditional double-sided tape is too sticky at room temperature, which can easily cause many problems when peeling off the carrier film, such as the accidental removal of electrode active materials. This not only wastes materials but may also significantly reduce battery performance. In addition, the excessive stickiness at room temperature can cause the tape to stick to the roller, which seriously affects the construction effect.

[0003] Invention CN117820972A discloses a double-sided protective tape for the welding area of ​​lithium-ion battery tabs and its preparation method. One side of the substrate of the double-sided protective tape is a rubber layer, and the other side is a pressure-sensitive adhesive layer that can dissolve in the electrolyte. This double-sided protective tape not only protects the welding area of ​​the tabs from lithium plating, but also promotes the dissociation of lithium salts after the adhesive layer dissolves, improving the battery's cycle performance and voltage polarization, and facilitating subsequent battery disassembly. However, due to its adhesive layer dissolution design, the tape may detach during battery cycling, and the adhesion after hot pressing cannot be maintained for a long time. The dissolved pressure-sensitive adhesive layer may also clog the battery separator, affecting ion transport inside the battery, reducing overall performance and posing safety hazards. Furthermore, this invention does not effectively solve the adhesion problem during carrier film peeling, making it difficult to completely avoid the risks of material loss and performance degradation.

[0004] Invention CN112920724A discloses a double-sided hot-melt pressure-sensitive adhesive tape for lithium batteries and its preparation method. The tape comprises seven layers from bottom to top: a double-sided release film, a first adhesive layer, a first base coating layer, a base film, a second base coating layer, a second adhesive layer, and a third adhesive layer. An aqueous base coating increases the adhesion between the hot-melt pressure-sensitive adhesive layer and the base film, and further blocks electrolyte penetration. SBS and SIS rubber elastomers are used on both sides to improve electrolyte resistance, increase adhesion and penetration. EVM rubber elastomer is used as a non-adhesive protective layer at room temperature, but it can generate adhesion under high-temperature conditions. This double-sided hot-melt pressure-sensitive adhesive tape has adhesion to aluminum foil and polyethylene film on one side at room temperature, but no adhesion to CPP surfaces on the other side at room temperature. Therefore, due to limitations in material selection and structural control, there is still a risk of accidental adhesion at room temperature, and the electrolyte barrier effect of the aqueous base coating may decrease with long-term immersion.

[0005] Therefore, how to provide a tape structure that can meet the bonding requirements of application scenarios, is easy to construct, and does not affect the electrode active materials or the electrochemical performance of the battery remains a problem that needs to be solved by those skilled in the art. Summary of the Invention

[0006] To address the shortcomings of the existing technologies, this invention provides a room-temperature non-adhesive double-sided tape, its preparation method, and its application. Through the design of the composition, performance, and interlayer adhesion of each layer, the optional cover film and carrier film layers can be smoothly peeled off before and after hot-pressing. While meeting the bonding requirements of application scenarios, especially the protection of electrode tabs, this invention avoids problems such as unstable adhesion of existing tapes, removal of electrode active materials by carrier film peeling, and sticking to rollers affecting construction.

[0007] In a first aspect, the present invention provides a room temperature non-adhesive double-sided tape, comprising a carrier film layer, a non-adhesive layer, a base film layer and a hot-pressing layer stacked sequentially.

[0008] The non-adhesive layer comprises, by weight:

[0009] 60-90 parts of the first polyolefin resin

[0010] 5-30 parts of elastic material;

[0011] By weight, the hot-pressed layer comprises:

[0012] 20-60 parts of the second polyolefin resin,

[0013] 30-70 parts of tackifying resin;

[0014] The first polyolefin resin and the second polyolefin resin each include at least one of α-olefin polymer resin and modified polyolefin resin;

[0015] The melt flow index of the elastic material is 1-100 g / 10 min under a temperature of 190-230℃ and a load of 5.00 kg.

[0016] The room temperature peel force between the non-adhesive layer and the carrier film layer is greater than that between the hot-pressed layer and the room temperature peel force, but less than that between the hot-pressed layers and the hot-pressed adhesive force.

[0017] Rubber is preferred as an elastic material, as it helps to improve the toughness and low-temperature resistance of the colloid.

[0018] Tackifying resins are mainly used to improve viscosity, wettability, and initial tack. Using tackifying resins with higher softening points also helps to improve the temperature resistance and chemical resistance of the colloid.

[0019] In the room temperature non-adhesive double-sided tape of the present invention, a base film layer provides good puncture strength for the tape; a hot-pressing layer with only weak or even negligible adhesion at room temperature provides a non-adhesive effect on one side of the double-sided tape, preventing the tape from adhering to external surfaces and causing damage to the electrode active material or the tape itself. In particular, the room temperature peel force between the non-adhesive layer and the carrier film layer is set to be greater than that of the hot-pressing layer. During the unwinding of the tape or the removal of the optional cover film from the hot-pressing layer, the adhesion and relative position of the non-adhesive layer and the carrier film layer are basically not affected, and there is no problem of tape slippage causing positioning deviation. On the other hand, after positioning and hot-pressing, the hot-pressing layer exhibits a hot-pressing adhesive force with the adhered object that is much greater than the room temperature peel force between the non-adhesive layer and the carrier film layer. Therefore, after hot-pressing adhesion, when the outermost carrier film layer is peeled off from the surface of the non-adhesive layer, the adhesive surface of the hot-pressing layer and the overall structure of the remaining tape are not affected. Furthermore, since the carrier film layer itself has virtually no adhesion, even if it is removed after hot-pressing, it will not stick to the electrode active material.

[0020] After hot-press bonding, the adhesive structure, consisting of a non-adhesive layer, a base film layer, and a hot-press layer, can be firmly stacked on the surface of the adhered object, for example, providing long-term stable protection for the tab solder marks. Furthermore, through the design of the adhesive layer material, the adhesive structure has good solvent resistance and can maintain a low dissolution rate and swelling rate even after long-term immersion in electrolyte.

[0021] Furthermore, room temperature non-adhesive double-sided tapes meet at least one of the following requirements:

[0022] 1) The carrier film is a single-sided or double-sided release film with a thickness of 15-100μm;

[0023] 2) The thickness of the non-adhesive layer is 0.5-12 μm;

[0024] 3) The thickness of the hot-pressed layer is 2-15μm;

[0025] 4) The thickness of the base film layer is 1-25μm, including at least one of PP film layer, PI film layer, PE film layer, PET film layer, PPS film layer and BOPP film layer.

[0026] Preferably, the carrier film layer is a double-sided release film, with its inner release surface connected to the non-adhesive layer and the inner release force being 5-60 g / inch, and its outer release surface connected to the hot-pressed layer during winding, with the outer release force being 0.1-10 g / inch.

[0027] Furthermore, a cover film is laminated on the outer side of the hot-pressed layer away from the base film layer. The cover film has a thickness of 10-40 μm, and the room temperature peel force between the hot-pressed layer and the cover film is 0.1-10 g / inch, which is less than the room temperature peel force between the non-adhesive layer and the carrier film layer. In this case, using a single-sided release film or a double-sided release film for the carrier film layer has essentially the same effect.

[0028] Furthermore, the cover film is a release film or an electrostatic film.

[0029] Furthermore, at least one of the non-adhesive layer, base film layer, and hot-pressed layer is a colored layer to facilitate identification during use.

[0030] Furthermore, the α-olefin polymer resin includes at least one of polyethylene resin (PE), polypropylene resin (PP), ethylene and octene copolymer resin (POE), and amorphous polyalphaolefin resin (APAO).

[0031] Modified polyolefin resins include at least one of maleic anhydride-modified polyolefin resins, (meth)acrylic acid-modified polyolefin resins, and copolymer-modified polyolefin resins. Specifically, they may include at least one of: MA-APAO, MA-POE, MA-PP, MA-PE, AA-APAO, AA-PP, AA-POE, AA-PE, MAA-PP, MAA-PE, MAA-POE, ethylene-acrylic acid copolymer (EAA), ethylene-methacrylic acid copolymer (EMAA), and ethylene-vinyl acetate copolymer (EVA).

[0032] Furthermore, in the first polyolefin resin, the mass ratio of α-olefin polymer resin to modified polyolefin resin is (5-65):(15-70), and the room temperature peel force between the non-adhesive layer and the carrier film layer is 5-60 g / inch.

[0033] In the second polyolefin resin, the mass ratio of α-olefin polymer resin to modified polyolefin resin is (5-30):(10-35), the room temperature peeling force of the hot-pressed layer is below 10 g / inch, and the hot-pressing adhesion force is above 100 N / m.

[0034] Furthermore, the first polyolefin resin and the second polyolefin resin may have different or the same resin composition.

[0035] Preferably, the first polyolefin resin and the second polyolefin resin use different types of resin composition. For example, in the first polyolefin resin of the non-adhesive layer, the α-olefin polymer resin can be a low molecular weight amorphous polyalphaolefin resin (APAO), which has an amorphous and irregular arrangement in its microstructure, and features low molecular weight (below 20,000), low viscosity (melt viscosity below 1500 mPa·s at 190℃), long open time, and low softening point (100-115℃); the modified polyolefin resin can be a copolymerized modified polyolefin resin, such as EAA, with a molecular weight below 50,000. In the second polyolefin resin of the hot-pressed layer, the α-olefin polymer resin can be a POE material with a molecular weight of 50,000-180,000, a high-performance thermoplastic elastomer material copolymerized from ethylene and α-olefins (such as octene and butene) through a metallocene catalyst; the modified polyolefin resin can be a maleic anhydride modified polyolefin resin, such as MA-PP, with a molecular weight of 60,000-180,000.

[0036] In general, the softening point and viscosity (or melt index) of α-olefin polymer resins have a significant impact. A softening point that is too low makes them prone to swelling or dissolving in the electrolyte, while a softening point that is too high prevents activation and good adhesion during hot pressing. Viscosity or melt index characterizes the molecular weight and processability of the material. The grafting rate of modified polyolefin resins has a significant impact, affecting the material's adhesion to metals. The preferred first polyolefin resin is one with a low molecular weight and high melt index, while the preferred second polyolefin resin is one with a high molecular weight and low melt index.

[0037] Preferably, the initial tack of the hot-pressed layer is above 200 N / m, and the liquid-soaked adhesive force of the hot-pressed layer is greater than the initial tack. Preferably, the liquid-soaked adhesive force is increased to above 250 N / m, and more preferably above 300 N / m.

[0038] Preferably, the swelling rate of the non-adhesive layer is less than 5%, more preferably less than 3%; and the dissolution rate of the non-adhesive layer is less than 5%, more preferably less than 3%.

[0039] Preferably, the swelling rate of the hot-pressed layer is less than 8%, more preferably less than 6%; the dissolution rate of the hot-pressed layer is less than 5%, preferably less than 3%.

[0040] In this invention, the overall softening point of the hot-pressed layer is relatively high, preferably above 120°C, and more preferably above 150°C. It exhibits virtually no stickiness at room temperature, preventing roller adhesion, yet maintains high hot-pressing adhesion, facilitating construction. The softening point of the hot-pressed layer is significantly higher than the immersion temperature of 85°C, resulting in excellent electrolyte resistance; the layer itself is almost unaffected by the electrolyte. Furthermore, the hot-pressed layer undergoes high-temperature and high-pressure activation treatment before immersion in the electrolyte. As the immersion time increases, the colloid in the hot-pressed layer fully wets the surface of the substrate being bonded, forming a stable "riveting effect." The electrolyte cannot corrode the tape's interior. Therefore, this invention demonstrates that the hot-pressing adhesion of the hot-pressed layer increases rather than decreases after immersion, surpassing the initial adhesion exhibited by the hot-pressed layer when initially immersing the substrate for a short time. Compared to other tape systems, where the colloid itself is easily swollen and dissolved by the electrolyte, resulting in a significant decrease in natural peel strength after immersion, or even complete disintegration, the tape of this invention is particularly suitable for lithium battery applications, such as tab solder protection.

[0041] Furthermore, by weight, the non-adhesive layer also contains 5-10 parts of the tackifying resin;

[0042] By weight, the hot-pressed layer also contains 1-20 parts of the elastic material and 1-20 parts of the viscosity modifier.

[0043] Furthermore, the tackifying resin includes at least one of rosin resin, terpene resin, and petroleum resin; preferably, the softening point of the tackifying resin is above 120°C, and a higher softening point is beneficial to improving the temperature resistance and chemical resistance of the adhesive layer.

[0044] Elastic materials include at least one of SBS, SIS, and SEBS rubber materials;

[0045] Viscosity modifiers include at least one of paraffin wax, microcrystalline wax, synthetic wax, polyethylene wax, polypropylene wax, and saxoline wax.

[0046] Preferably, the molecular weight of the elastic material is above 100,000 and the softening point is above 100°C. More preferably, the molecular weight of the elastic material is above 150,000 and the softening point is above 200°C. The melt index is 2-50 g / 10 min under a load of 5.00 kg at a temperature of 190-230°C. The styrene content is 15-35 wt%. The higher the styrene content, the higher the strength of the material itself; the lower the styrene content, the better the flexibility of the material.

[0047] Secondly, the present invention also provides a method for preparing the aforementioned room temperature non-adhesive double-sided adhesive tape, comprising the following steps:

[0048] Step 1: Apply a non-adhesive coating liquid to one side of the carrier film layer, dry it, and then heat-press it onto one side of the base film layer;

[0049] Step 2: Apply a hot-press coating liquid to the other side of the base film layer and dry it to obtain the room temperature non-adhesive double-sided tape.

[0050] Furthermore, the non-adhesive coating liquid is a solvent-based coating liquid or an aqueous coating liquid.

[0051] Furthermore, the hot-pressed coating liquid is a solvent-based coating liquid or an aqueous coating liquid.

[0052] Specifically, the solvent-based coating solution is prepared through the following steps:

[0053] A. Add the solvent to the reaction vessel and stir at a speed of 15-30 rpm;

[0054] B. Weigh and feed the materials, and according to the resin softening point, turn on the reactor and heat it to 130-170℃;

[0055] C. Increase the stirring speed to 50-70 rpm and stir for 45-90 minutes to fully dissolve;

[0056] D. After the solid content test is qualified, start the cooling process. When the temperature is ≤60℃, filter the material to obtain the solvent-based coating liquid.

[0057] The solvent content is adjusted according to the coating solid content, and the solid content is controlled between 4-50 wt%. The solvent is selected from at least one of aromatic hydrocarbon solvents, ketone solvents, and aliphatic hydrocarbon solvents.

[0058] When preparing a non-adhesive coating liquid, the preferred order of feeding raw materials is: elastic material, optional tackifying resin, and first polyolefin resin.

[0059] When preparing the hot-press coating liquid, the preferred order of feeding raw materials is: optional elastic material, tackifying resin, second polyolefin resin, and optional viscosity modifier.

[0060] Specifically, the aqueous coating solution is prepared through the following steps:

[0061] A. Weighing and feeding: Add the solvent and raw materials into the reaction vessel, and start stirring. The stirring speed is ≥30 rpm, and the temperature is set to 60-160℃ until a clear mixture A without solid particles is obtained.

[0062] B. In another new reactor, weigh and add deionized water and emulsifier in sequence. Set the temperature to 30-50℃ and mix and stir at a speed of 20-40 rpm for 45-90 min to obtain mixture B.

[0063] C. Add mixture B to the above mixture A, set the temperature to 30-50℃ and mix and stir at a speed of 60-80 rpm for 15-45 minutes to obtain mixture C.

[0064] D. The mixture C is sheared or homogenized using a high-speed shearing machine or a homogenizer;

[0065] E. Distill the treated mixture C to remove the solvent, controlling the temperature at 80-90℃ and the stirring speed at 40-50 rpm, to obtain an aqueous coating solution.

[0066] When preparing a non-adhesive coating liquid, the preferred order of feeding raw materials is: elastic material, optional tackifying resin, and first polyolefin resin.

[0067] When preparing the hot-press coating liquid, the preferred order of feeding raw materials is: optional elastic material, tackifying resin, second polyolefin resin, and optional viscosity modifier.

[0068] Furthermore, following step two, the following steps are also included:

[0069] Die-cut along a direction perpendicular to the carrier film layer to remove the stacked non-adhesive layer, base film layer and hot-pressed layer from the carrier film layer, forming multiple spaced adhesive units on the carrier film layer;

[0070] Optionally, a cover film may be attached to the outer side of the hot-pressed layer away from the base film layer.

[0071] The size and shape of the bonding unit can be obtained by die-cutting as described above according to the actual application requirements. Each bonding unit has a non-adhesive layer, a base film layer and a hot-pressing layer.

[0072] Thirdly, based on the structure, composition and performance characteristics of the aforementioned room temperature non-adhesive double-sided tape, the present invention provides an application of the aforementioned room temperature non-adhesive double-sided tape in tab protection, electrode protection, electrode edge insulation protection, and finishing tape.

[0073] The application of the aforementioned room temperature non-adhesive double-sided tape includes the following steps:

[0074] S1: Simply peel off the cover film (if there is a cover film), align the heat-pressed layer with the object to be adhered, and gently stick it on.

[0075] S2: Achieve stable bonding between the hot-pressed layer and the adherend through hot-pressing activation. The hot-pressing conditions are, for example, 80-100℃, 0.1-1.5MPa, and 0.2-0.5s.

[0076] S3: Remove the carrier film layer to complete the application of the tape.

[0077] The room temperature non-adhesive double-sided tape provided by this invention has at least the following beneficial effects:

[0078] (1) The room temperature non-adhesive double-sided tape of the present invention has different adhesive properties for each layer through material selection and composition adjustment. In particular, the room temperature peel strength between the non-adhesive layer and the carrier film layer is greater than that between the hot-pressed layer and the hot-pressed layer, but less than that between the hot-pressed layers. It has at least the following advantages:

[0079] Before use, the double-sided tape remains essentially non-sticky at room temperature, making it difficult to adhere to other parts and thus preventing unwanted wear or slippage.

[0080] When in use, the cover film can be easily peeled off without causing the carrier film layer and the non-adhesive layer to peel off or shift, which helps to accurately bond the hot-pressed layer to the object to be bonded.

[0081] A stable bond between the hot-pressed layer and the substrate is achieved through hot-press activation, and the hot-pressed layer has a fast thermal activation speed, which can achieve good bonding in a short time.

[0082] The carrier film layer is removed because it is non-adhesive, so the removal process will not remove the electrode active material. Furthermore, the room temperature peel force between the non-adhesive layer and the carrier film layer is less than the hot-pressing adhesion force of the hot-pressed layer, so the removal process will not cause any risk of damage to the bonding interface of the hot-pressed layer.

[0083] (2) The room temperature non-adhesive double-sided tape of the present invention has excellent comprehensive performance, strong resistance to electrolyte, very low swelling and dissolution rate in electrolyte, and can maintain high adhesion for a long time. It has broad application prospects in the field of lithium battery.

[0084] (3) The preparation method of room temperature non-adhesive double-sided tape is simple. The non-adhesive coating liquid and the hot-pressing coating liquid can be solvent-based or water-based coating liquid, which can be completed by drying and hot pressing processes, making it suitable for large-scale automated production. Attached Figure Description

[0085] Figure 1 This is a schematic diagram of the structure of the first embodiment of the present invention;

[0086] Figure 2 This is a schematic diagram of the structure of the second embodiment of the present invention.

[0087] Explanation of reference numerals in the attached drawings: 10-carrier film layer, 20-non-adhesive layer, 30-base film layer, 40-hot-pressed layer, 50-cover film, 100-adhesive unit. Detailed Implementation

[0088] To better understand the above technical solutions, a detailed description of the solutions will be provided below in conjunction with the accompanying drawings and specific embodiments. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0089] The terminology used in the embodiments of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms “a,” “the,” and “the” as used in the embodiments of this invention and the appended claims are also intended to include the plural forms, and “multiple” generally includes at least two unless the context clearly indicates otherwise.

[0090] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or device. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or device that includes said element.

[0091] See appendix Figure 1-2 A room temperature non-adhesive double-sided tape, comprising, in sequence: a carrier film layer 10, a non-adhesive layer 20, a base film layer 30, a hot-pressing layer 40, and an optional cover film 50;

[0092] The thickness of the carrier film layer 10 is 15-100μm, and it is a single-sided release film or a double-sided release film, preferably a silicon-containing release film. The carrier film layer 10 is disposed on the outer side of the non-adhesive layer 20.

[0093] The cover film 50 has a thickness of 10-40 μm and is a release film, preferably a silicon-containing release film or an electrostatic film. The cover film 50 is disposed on the outer side of the hot-pressed layer 40.

[0094] The adhesive structure includes a non-adhesive layer 20, a base film layer 30, and a hot-pressed layer 40, with an overall thickness D of 8-40 μm, preferably 10-30 μm. The specific structure is as follows:

[0095] (1) Non-adhesive layer 20, with a thickness of 0.5-12 μm, comprising, by weight:

[0096] 60-90 parts of the first polyolefin resin

[0097] 5-30 parts of elastic material

[0098] 0-10 parts of tackifying resin;

[0099] The first polyolefin resin includes at least one of α-olefin polymer resin and modified polyolefin resin; preferably, the α-olefin polymer resin in the first polyolefin resin is a low molecular weight amorphous polyα-olefin resin (APAO), which has the characteristics of low molecular weight (below 20,000), low viscosity (melt viscosity at 190°C below 1500 mPa·s), long open time and low softening point (100-115°C); the modified polyolefin resin is a copolymerized modified polyolefin resin, such as EAA, with a molecular weight below 50,000.

[0100] The elastic material includes at least one of SBS, SIS, and SEBS rubber materials. Preferably, the molecular weight of the elastic material is above 100,000 and the softening point is above 100°C. More preferably, the molecular weight of the elastic material is above 150,000 and the softening point is above 200°C. The melt index is 2-50 g / 10 min under a load of 5 kg at a temperature of 190-230°C, and the styrene content is 15-35 wt%.

[0101] The tackifying resin is preferably 5-10 parts, including at least one of rosin resin, terpene resin, and petroleum resin.

[0102] Preferably, in the first polyolefin resin, the mass ratio of α-olefin polymer resin to modified polyolefin resin is (5-65):(15-70), and after hot pressing, the room temperature peel force between the non-adhesive layer 20 and the carrier film layer 10 is 5-60 g / inch, preferably 10-60 g / inch.

[0103] (2) Base film layer 30, with a thickness of 1-25μm, including at least one of PP film layer, PI film layer, PE film layer, PET film layer, PPS film layer and BOPP film layer;

[0104] (3) Hot-pressed layer 40, with a thickness of 2-15 μm, comprising, by weight:

[0105]

[0106] The second polyolefin resin includes at least one of α-olefin polymer resin and modified polyolefin resin; preferably, the α-olefin polymer resin in the second polyolefin resin is selected from POE material with a molecular weight of 50,000 to 180,000, which is a high-performance thermoplastic elastomer material copolymerized from ethylene and α-olefins (such as octene and butene) through a metallocene catalyst; the modified polyolefin resin is selected from maleic anhydride modified polyolefin resin, such as MA-PP, with a molecular weight of 60,000 to 180,000.

[0107] Tackifying resins include at least one of rosin resin, terpene resin, and petroleum resin;

[0108] The elastic material is preferably 1-20 parts, including at least one of SBS, SIS, and SEBS rubber materials. Preferably, the molecular weight of the elastic material is above 100,000 and the softening point is above 100°C. More preferably, the molecular weight of the elastic material is above 150,000 and the softening point is above 200°C. The melt index is 2-50 g / 10 min under a load of 5 kg at a temperature of 190-230°C, and the styrene content is 15-35 wt%.

[0109] The viscosity modifier is preferably 1-20 parts, including at least one of paraffin wax, microcrystalline wax, synthetic wax, polyethylene wax, polypropylene wax, and saxoline wax.

[0110] Preferably, in the second polyolefin resin, the mass ratio of α-olefin polymer resin to modified polyolefin resin is (5-30):(10-35), and the hot-pressed layer can have weak tackiness at room temperature, for example, the room temperature peeling force is less than 10 g / inch, while the hot-pressing adhesion force is more than 100 N / m.

[0111] The room temperature peel force between the non-adhesive layer 20 and the carrier film layer 10 is greater than that between the hot-pressed layer 40 and the room temperature peel force, but less than that between the hot-pressed layer 40 and the hot-pressed adhesive force. During winding, unwinding, storage, transportation, or removal of the cover film 50 from the surface of the hot-pressed layer 40, the adhesion and relative position between the non-adhesive layer 20 and the carrier film layer 10 are not affected. Furthermore, during the removal of the carrier film layer 10 after hot-pressing adhesion, the adhesive structure is not torn off along with the non-adhesive layer, nor does it adhere to or damage the electrode active material.

[0112] Based on the aforementioned exemplary material selection, specifically, the α-olefin polymer resin includes at least one of polyethylene resin (PE), polypropylene resin (PP), ethylene and octene copolymer resin (POE), and amorphous polyalphaolefin resin (APAO);

[0113] Modified polyolefin resins include at least one of maleic anhydride-modified polyolefin resins, (meth)acrylic acid-modified polyolefin resins, and copolymer-modified polyolefin resins. Specifically, they include at least one of: MA-APAO, MA-POE, MA-PP, MA-PE, AA-APAO, AA-PP, AA-POE, AA-PE, MAA-PP, MAA-PE, MAA-POE, ethylene-acrylic acid copolymer (EAA), ethylene-methacrylic acid copolymer (EMAA), and ethylene-vinyl acetate copolymer (EVA).

[0114] See appendix Figure 1 In the first embodiment, the carrier film layer 10, the non-adhesive layer 20, the base film layer 30, and the hot-pressed layer 40 are sequentially stacked and prepared by the following method:

[0115] Step 1: Apply non-adhesive layer 20 coating liquid to one side of the carrier film layer 10, dry it, and then heat press it to one side of the base film layer 30.

[0116] Step 2: Apply a hot-pressing layer 40 coating liquid to the other side of the base film layer 30 and dry it to obtain the room temperature non-adhesive double-sided tape.

[0117] Optionally, a cover film 50 may be attached to the outer side of the hot-pressed layer 40 away from the base film layer 30.

[0118] See appendix Figure 2 In the second embodiment, the following steps are included after step two:

[0119] Die-cutting is performed along a direction perpendicular to the carrier film layer 10. Since the adhesive force between the non-adhesive layer 20 and the carrier film layer 10 is relatively weak, a portion of the stacked non-adhesive layer 20, base film layer 30, and hot-pressed layer 40 is removed from the carrier film layer 10, forming multiple spaced adhesive units 100 on the carrier film layer. Each adhesive unit 100 has an adhesive structure including the non-adhesive layer 20, base film layer 30, and hot-pressed layer 40. Along a direction parallel to the carrier film layer 10, the cross-sectional shape and size of the adhesive unit 100 are determined and die-cut according to the application scenario to match the adhesive protection requirements of different battery specifications and areas, including but not limited to continuous patterns, discontinuous patterns, and combinations thereof.

[0120] For example, taking the extension direction X (or longitudinal direction) of the double-sided tape and the perpendicular direction Y (or transverse direction) of the tape extension direction as references, when the bonding unit 100 is die-cut into a rectangular cross-sectional shape with intervals, the following options are available:

[0121] 1) The length of the adhesive unit 100 in the extension direction X is 1-5mm (i.e., the width of the rectangle);

[0122] 2) The length of the bonding unit 100 in the vertical Y direction is 5-20mm (i.e., the long side of the rectangle);

[0123] 3) The spacing between adjacent bonding units 100 in the extension direction X is 5-20mm (i.e., the spacing between the adjacent long sides of two spaced rectangles).

[0124] The non-adhesive areas between the spaced adhesive units 100 retain their non-adhesive function because they lack an adhesive structure. That is, after bonding, the non-adhesive carrier film layer 10 can be peeled off to leave a space. The size of the die-cut pieces varies depending on the production line process requirements. In other words, the cross-sectional shape, size, and spacing of the adhesive units 100 can be set and combined in various ways, and need to be determined and die-cut according to the application scenario.

[0125] Alternatively, a cover film 50 may be attached to the outer side of the hot-pressed layer 40 of the adhesive unit 100 away from the base film layer 30. In this case, multiple adhesive units 100 are spaced apart between the carrier film layer 10 and the cover film 50.

[0126] The aforementioned non-adhesive layer 20 coating liquid and hot-press layer 40 coating liquid can be solvent-based or water-based coating liquids.

[0127] Taking the room temperature non-adhesive double-sided tape described in the above embodiments as an example, its use includes, but is not limited to, the following steps:

[0128] (1) Uncover the cover film 50 and attach the hot-pressed layer 40 to the object to be adhered;

[0129] (2) Hot pressing, which heats and activates the hot pressing layer 40 to bond it to the object to be bonded;

[0130] (3) Remove the carrier film layer 10. Since the carrier film layer 10 is not sticky, the removal process will not stick to the electrode active layer material.

[0131] The specific grades and corresponding physicochemical parameters of the main raw materials in each embodiment of the present invention are shown in Table 1:

[0132] Table 1:

[0133]

[0134]

[0135] Example 1

[0136] The room temperature non-adhesive double-sided tape of Example 1 comprises a carrier film layer 10, a non-adhesive layer 20, a base film layer 30, a hot-pressing layer 40, and a cover film 50, stacked sequentially. See Appendix. Figure 1 Specifically:

[0137] (1) The carrier film layer 10 has a thickness of 50μm and is a silicone release film for PET substrate;

[0138] (2) Non-adhesive layer 20, with a thickness of 2 μm, comprises, by weight:

[0139] The first polyolefin resin includes:

[0140]

[0141] (3) The base film layer 30 is a PET film with a thickness of 5μm;

[0142] (4) Hot-pressed layer 40, with a thickness of 5 μm, comprises, by weight:

[0143] The second polyolefin resin includes:

[0144] α-Polyolefin 3588FL 20 parts

[0145] Modified polyolefin QF551, 20 parts;

[0146] 46 parts of petroleum resin P125;

[0147] 8 parts of SIS rubber D1114;

[0148] 6 parts of viscosity modifier LP130;

[0149] (5) Cover film 50, with a thickness of 25μm, is made of PET substrate silicone release film;

[0150] The room temperature non-adhesive double-sided tape of Example 1 was prepared by the following method:

[0151] Step 1: Apply non-adhesive layer 20 coating liquid to one side of the carrier film layer 10, dry it, and then heat press it to one side of the base film layer 30.

[0152] Step 2: Apply a hot-pressing layer 40 coating liquid to the other side of the base film layer 30 and dry it to obtain the room temperature non-adhesive double-sided tape.

[0153] Step 3: Attach the cover film 50 to the outer side of the hot-pressed layer 40 away from the base film layer.

[0154] Among them, the non-adhesive layer 20 coating liquid and the hot-pressed layer 40 coating liquid are solvent-based coating liquids.

[0155] Specifically, the non-adhesive coating solution is prepared through the following steps:

[0156] A. Add the organic solvent (aromatic solvent) into the reaction vessel, turn on the stirrer, and stir at a speed of 20 rpm;

[0157] B. Weigh and feed the materials in sequence, adding SEBS rubber, petroleum resin and first polyolefin resin in that order, and turn on the reactor to heat to 150±10℃.

[0158] C. Increase the stirring speed to 60 rpm and stir for 60 minutes to fully dissolve;

[0159] D. Set the solid content to 10-15wt%. After the test is passed, start the cooling process. When the temperature is ≤60℃, filter the material using a metal filter screen and discharge it after demagnetization to obtain a solvent-based non-stick coating liquid.

[0160] The hot-press coating liquid is prepared through the following steps:

[0161] A. Add the organic solvent (aromatic solvent) into the reaction vessel, turn on the stirrer, and stir at a speed of 20 rpm;

[0162] B. Weigh and feed the materials in sequence, adding SIS rubber, petroleum resin, second polyolefin resin and viscosity modifier in order, and turn on the reactor to heat to 150±10℃.

[0163] C. Increase the stirring speed to 60 rpm and stir for 60 minutes to fully dissolve;

[0164] D. The solid content is set at 20-25wt%. After the test is passed, the cooling is turned on. When the temperature is ≤60℃, the material is filtered with a metal filter and discharged after demagnetization to obtain a solvent-based hot-press coating liquid.

[0165] Application Example 1

[0166] The order and composition of the layers of the room temperature non-adhesive double-sided tape in Application Example 1 are the same as in Example 1, except that a die-cutting step is included after step two:

[0167] Die-cutting is performed along a direction perpendicular to the carrier film layer 10, removing the entire stacked non-adhesive layer 20, base film layer 30, and hot-pressed layer 40 from the carrier film layer 10, forming multiple spaced adhesive units 100 on the carrier film layer 10. Each adhesive unit 100 has an adhesive structure including the non-adhesive layer 20, base film layer 30, and hot-pressed layer 40, such as... Figure 2 As shown. With reference to the extension direction X of the double-sided tape and the perpendicular direction Y of the tape extension direction, the adhesive unit 100 is die-cut into rectangular cross-sectional shapes spaced apart:

[0168] The length of the adhesive unit 100 in the extension direction X is 2.5 mm;

[0169] The length of the adhesive unit 100 in the vertical Y direction is 11mm;

[0170] The spacing between adjacent adhesive units 100 in the extension direction X is 8 mm.

[0171] Application Example 2

[0172] Application Example 2 has the same basic structure and composition as Application Example 1, see [link / reference] Figure 2 As shown, the difference lies in the different dimensions of the 100-gauge adhesive unit of the room temperature non-adhesive double-sided tape. The specific differences are as follows:

[0173] The length of the adhesive unit 100 in the extension direction X is 2.2 mm;

[0174] The length of the adhesive unit 100 in the vertical Y direction is 5.5 mm;

[0175] The spacing between adjacent adhesive units 100 in the extension direction X is 13mm.

[0176] Example 2

[0177] The difference between this embodiment and Embodiment 1 is that the composition of each layer is slightly different, as detailed below:

[0178] (1) The thickness of the carrier film layer 10 is 50 μm, and the material is a PET substrate silicone release film;

[0179] (2) The thickness of the non-adhesive layer 20 is 1 μm, and its composition is the same as that in Example 1;

[0180] (3) The base film layer 30 is a BOPP film with a thickness of 8μm;

[0181] (4) The thickness of the hot-pressed layer 40 is 3 μm, and its composition is the same as that of Example 1;

[0182] (5) The thickness of the cover film 50 is 25μm, and the material is PET substrate silicone release film.

[0183] Example 3

[0184] The difference between this embodiment and Embodiment 1 is that the composition of each layer is slightly different, as detailed below:

[0185] (1) The thickness of the carrier film layer 10 is 50 μm, and the material is a PET substrate silicone release film;

[0186] (2) The thickness of the non-adhesive layer 20 is 5 μm, and its composition is the same as that in Example 1;

[0187] (3) The base film layer 30 is a PI film with a thickness of 5.5 μm;

[0188] (4) The thickness of the hot-pressed layer 40 is 8 μm, and its composition is the same as that of Example 1;

[0189] (5) The thickness of the cover film 50 is 25μm, and the material is PET substrate silicone release film.

[0190] Example 4

[0191] The room temperature non-adhesive double-sided tape of Example 4 has the same structure and composition as that of Example 1, except that the non-adhesive coating liquid and the hot-press coating liquid of Example 4 are aqueous coating liquids. The non-adhesive coating liquid is prepared by the following steps:

[0192] A. Weighing and feeding: Add the solvent cyclohexane, elastic material, optional tackifying resin, and first polyolefin resin into the reactor, and start stirring at a speed of about 45 rpm and a temperature of 70±10℃ until a clear mixture A without solid particles is obtained.

[0193] B. In another new reactor, weigh and add deionized water and emulsifier in sequence. Set the temperature to 40℃ and mix and stir at a speed of 30 rpm for 60 minutes to obtain mixture B.

[0194] C. Add mixture B to the above mixture A, set the temperature to 45±2℃ and mix and stir at a stirring speed of 70 rpm for 30 min to obtain mixture C;

[0195] D. The mixture C is homogenized twice using a homogenizer;

[0196] E. Distill the homogenized mixture C to remove the solvent, control the temperature at 85±2℃ and the stirring speed at 45rpm to obtain a non-adhesive aqueous coating solution.

[0197] The hot-press coating liquid is prepared through the following steps:

[0198] A. Weighing and feeding: Add solvent cyclohexane, optional elastic material, tackifying resin, second polyolefin resin, and optional viscosity modifier into the reactor, and start stirring at a speed of 45 rpm and a temperature of 70±10℃ until a clear mixture A without solid particles is obtained.

[0199] B. In another new reactor, weigh and add deionized water and emulsifier in sequence. Set the temperature to 40℃ and mix and stir at a speed of 30 rpm for 60 minutes to obtain mixture B.

[0200] C. Add mixture B to the above mixture A, set the temperature to 45±2℃ and mix and stir at a stirring speed of 75 rpm for 30 min to obtain mixture C.

[0201] D. The mixture C is homogenized twice using a homogenizer;

[0202] E. Distill the homogenized mixture C to remove the solvent, control the temperature at 85±2℃ and the stirring speed at 45rpm to obtain the water-based coating liquid for the hot-pressed layer.

[0203] The differences between Examples 1 to 4 are detailed in Table 2:

[0204] Table 2:

[0205]

[0206] Examples 5-9 and Comparative Examples 1-2

[0207] The difference between Examples 5-9 and Comparative Examples 1-2 and Example 1 lies in the different raw material ratios in the non-adhesive layer and the hot-pressed layer. Specific differences are shown in Table 3.

[0208] Table 3. Raw material composition of non-adhesive and hot-pressed layers in Examples 1, 5-9 and Comparative Examples 1-2

[0209]

[0210]

[0211] Comparative Example 3

[0212] The difference between Comparative Example 3 and Example 1 is that the non-adhesive layer and the hot-pressed layer in the non-adhesive double-sided tape of Comparative Example 3 are both acrylic adhesive (acrylic resin).

[0213] Test methods and results

[0214] Samples were prepared for performance testing based on the composition parameters of each layer in Examples 1-9 and the comparative examples: a non-adhesive coating liquid was applied to one side of the carrier film layer, and after drying, it was bonded to the base film layer by hot pressing. A hot pressing coating liquid was applied to the other side of the base film layer, and after drying, it was cut to a size of 20mm×100mm. A cover film was pasted on the surface of the hot pressing layer away from the base film layer to obtain the corresponding tape samples. Each tape sample was tested, and the results are shown in Table 4.

[0215] (1) Test of peeling force of carrier film layer: Remove the cover film of the tape sample and press it onto the steel plate by hot pressing. The peeling force of the carrier film layer at 180° between the carrier film layer and the non-adhesive layer is the peeling force of the carrier film layer. The peeling speed is 300mm / min.

[0216] (2) Hot-pressing initial tack test @Al foil: Remove the cover film of the tape sample, heat press it onto the aluminum foil, then stick the aluminum foil onto the steel plate with double-sided tape, remove the carrier film layer, and test the 180° peel force between the hot-pressed layer and the aluminum foil. The peeling speed is 300mm / min.

[0217] (3) Immersion adhesive strength test: Remove the cover film of the tape sample, press it onto the aluminum foil by heat, remove the carrier film layer, immerse it in the electrolyte, place it in an 85℃ oven for aging for 4 hours, take it out and wipe it dry, and test the adhesive strength according to the above method (2), which is the immersion adhesive strength.

[0218] (4) Swelling rate test: Take 2±0.1g of non-adhesive layer and hot-pressed layer respectively, record the mass as M1, soak in 50g of electrolyte, place in an 85℃ oven and age for 24 hours, take out the glue block, wipe off the electrolyte on its surface, weigh to obtain M2, and calculate the swelling rate according to the formula (M2-M1)×100% / M1.

[0219] (5) Dissolution rate test: Take 1.4±0.1g of non-adhesive layer and hot-pressed layer respectively, and record the mass as M1. Soak them in 7±0.5g of electrolyte, and record the mass as M2. Then seal them in a vial and place them in an 85℃ oven. After aging for 24 hours, take 20±5mg of the clear liquid. Heat it to 300℃ at a rate of 10℃ / min using a thermogravimetric analyzer (TGA) and read the weight percentage of the residual material, and record it as A. Calculate the dissolution rate according to the formula A×M2 / M1.

[0220] Table 4 Test results of Examples 1-9 and Comparative Examples 1-3

[0221]

[0222] The test results show that the room temperature peel force between the non-adhesive layer and the carrier film layer in the above samples (preferably 10-40 g / inch, more preferably 12-25 g / inch) is greater than the room temperature peel force between the hot-pressed layer and the cover film (preferably 0.1-5 g / inch, more preferably 0.5-2.5 g / inch). When removing the cover film before using tape, it will not have much impact on the structure of the carrier film layer and the adhesive layer. Secondly, after hot pressing, the adhesion force between the hot-pressed layer and the adhered object (e.g., aluminum foil) (above 190 N / m) is much greater than the peel force between the non-adhesive layer and the carrier film layer. Therefore, the carrier film layer can be easily peeled off from the surface of the non-adhesive layer without much impact on the structure of the adhesive layer. Furthermore, due to the non-adhesive nature of the carrier film layer, it will not stick to the electrode active layer material when peeled off after hot pressing, and will not have a negative impact on the battery. Furthermore, based on the swelling and dissolution test results of the non-adhesive layer and the hot-pressed layer in the electrolyte, it can be seen that the swelling rate of the non-adhesive layer of the tape in the electrolyte is less than 5%, more preferably less than 3%, and the dissolution rate is less than 5%, more preferably less than 3%; the swelling rate of the hot-pressed layer is less than 8%, more preferably less than 6%, and the dissolution rate is less than 5%, more preferably less than 3%, demonstrating strong resistance to electrolyte. Moreover, after soaking in the electrolyte, the soaking adhesion of the hot-pressed layer increases to over 250 N / m, preferably over 300 N / m. The hot-pressed layer undergoes high-temperature and high-pressure activation treatment before immersion in the electrolyte. As the immersion time increases, the colloid of the hot-pressed layer fully wets the surface of the substrate to be bonded, forming a stable "riveting effect," and the electrolyte cannot corrode the interior of the tape. Therefore, this invention demonstrates that the hot-pressing adhesion of the hot-pressed layer after soaking does not decrease but rather increases, which is superior to the initial adhesion exhibited by the hot-pressed layer when initially immersing the substrate for a short time. This is particularly suitable for applications in the lithium battery field, such as tab solder protection. In contrast, in Comparative Example 1, the composition of the non-adhesive layer was outside the material composition range, resulting in a low room temperature peel force between the non-adhesive layer and the carrier film layer, only 3 g / inch (less than 5 g / inch), similar to the peel force of the cover film. This meant the adhesive layer was easily carried away when the cover film was removed. In Comparative Example 2, the composition of the hot-pressing layer was outside the material composition range, resulting in poor thermal activation in a short time when measuring the initial hot-pressing tack. The adhesive layer and Al foil did not achieve good wetting, leading to a low initial tack. Furthermore, the adhesive layer had a high dissolution rate in the electrolyte, and its adhesive strength decreased significantly after soaking. In addition, the bonding performance, electrolyte resistance, and other comprehensive properties of the bonding units in Application Examples 1 and 2 of this invention are similar to those in Example 1, demonstrating various designs and applications of the bonding units.

[0223] In summary, the present invention, through the design of the structure of each layer, the bonding unit, and the bonding force of the room temperature non-adhesive double-sided tape, enables the room temperature non-adhesive double-sided tape to better meet the construction process and effectively protect the electrode tab solder marks.

[0224] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention. Clearly, those skilled in the art can make various alterations and modifications to the invention without departing from its spirit and scope. Thus, if these modifications and modifications of the invention fall within the scope of the claims and their equivalents, the invention is also intended to include these modifications and modifications.

Claims

1. A room temperature non-adhesive double-sided tape, characterized in that, It includes a carrier film layer, a non-adhesive layer, a base film layer, and a hot-pressed layer stacked in sequence; The non-adhesive layer comprises, by weight: 60-90 parts of the first polyolefin resin 5-30 parts of elastic material; By weight, the hot-pressed layer comprises: 20-60 parts of the second polyolefin resin, 30-70 parts of tackifying resin; The carrier film layer is a single-sided release film or a double-sided release film with a thickness of 15-100 μm, the non-adhesive layer has a thickness of 0.5-12 μm, and the hot-pressed layer has a thickness of 2-15 μm. The thickness of the base film layer is 1-25 μm, including at least one of PP film layer, PI film layer, PE film layer, PET film layer, PPS film layer, and BOPP film layer; In the first polyolefin resin, the mass ratio of α-olefin polymer resin to modified polyolefin resin is (5-65):(15-70). In the second polyolefin resin, the mass ratio of α-olefin polymer resin to modified polyolefin resin is (5-30):(10-35); The melt flow index of the elastic material is 1-100 g / 10 min under a temperature of 190-230℃ and a load of 5.00 kg. The room temperature peel force between the non-adhesive layer and the carrier film layer is greater than that between the hot-pressed layer and the room temperature peel force, but less than that between the hot-pressed layers and the hot-pressed adhesive force.

2. The room temperature non-adhesive double-sided tape as described in claim 1, characterized in that, A cover film is also stacked on the outer side of the hot-pressed layer away from the base film layer. The thickness of the cover film is 10-40 μm. The room temperature peel force between the hot-pressed layer and the cover film is 0.1-10 g / inch, which is less than the room temperature peel force between the non-adhesive layer and the carrier film layer.

3. The room temperature non-adhesive double-sided tape as described in claim 1, characterized in that, α-olefin polymer resins include at least one of polyethylene resin (PE), polypropylene resin (PP), ethylene and octene copolymer resin (POE), and amorphous polyα-olefin resin (APAO); Modified polyolefin resins include at least one of maleic anhydride modified polyolefin resins, (meth)acrylic acid modified polyolefin resins, and copolymer modified polyolefin resins.

4. The room temperature non-adhesive double-sided tape as described in claim 3, characterized in that, The room temperature peel force between the non-adhesive layer and the carrier film layer is 5-60 g / inch; The room temperature peeling force of the hot-pressed layer is below 10g / inch, and the hot-pressing adhesion force is above 100N / m.

5. The room temperature non-adhesive double-sided tape as described in claim 4, characterized in that, The non-adhesive layer further comprises 5-10 parts of the tackifying resin by weight; By weight, the hot-pressed layer also contains 1-20 parts of the elastic material and 1-20 parts of the viscosity modifier.

6. The room temperature non-adhesive double-sided tape as described in claim 5, characterized in that, Tackifying resins include at least one of rosin resin, terpene resin, and petroleum resin; Elastic materials include at least one of SBS, SIS, and SEBS rubber materials; Viscosity modifiers include at least one of paraffin wax, microcrystalline wax, synthetic wax, polyethylene wax, polypropylene wax, and saxoline wax.

7. The method for preparing room temperature non-adhesive double-sided tape according to any one of claims 1-6, characterized in that, Includes the following steps: Step 1: Apply a non-adhesive coating liquid to one side of the carrier film layer, dry it, and then heat-press it onto one side of the base film layer; Step 2: Apply a hot-press coating liquid to the other side of the base film layer and dry it to obtain the room temperature non-adhesive double-sided tape.

8. The preparation method according to claim 7, characterized in that, The following steps are included after step two: Die-cut along a direction perpendicular to the carrier film layer to remove the stacked non-adhesive layer, base film layer and hot-pressed layer from the carrier film layer, forming multiple spaced adhesive units on the carrier film layer; Optionally, a cover film may be attached to the outer side of the hot-pressed layer away from the base film layer.

9. The application of the room temperature non-adhesive double-sided tape as described in any one of claims 1-6 in tab protection, electrode protection, electrode edge insulation protection, and finishing tape.

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