High temperature non-stick material, method for preparing the same and use thereof

Abstract

The application discloses a high-temperature non-tackifying material and a preparation method and application thereof, and belongs to the technical field of new energy battery protection films. The self-adhesive layer composition provided by the application comprises the following components in parts by weight: 25-52 parts of a styrene thermoplastic elastomer, 4-28 parts of a tackifying resin, 28-62 parts of a polyolefin substance and 0.008-1.05 parts of a lubricant. The lubricant comprises ethylene bis-stearamide. The polyolefin substance is an ethylene / alpha-olefin copolymer. The high-temperature non-tackifying material provided by the application has a certain peeling force, and after high-temperature treatment, the peeling force change range is within a reasonable range, which is beneficial to peeling after high-temperature treatment and actual application requirements. The application also provides a preparation method of the high-temperature non-tackifying material and application of the high-temperature non-tackifying material in power battery protection films for new energy vehicles.

Description

Technical Field

[0001] This invention relates to the field of new energy battery protective film technology, specifically to a high-temperature non-adhesive material, its preparation method, and its application. Background Technology

[0002] In recent years, energy and environmental issues have become increasingly serious. With economic and social development, while pursuing high-quality products, people have also raised new demands for environmental protection. One of the most effective solutions to pollution caused by automobiles is the development of new energy vehicles. Power batteries are a crucial component of new energy vehicles. During production and assembly, a protective film is often used to protect the aluminum foil casing of the battery from scratches. Battery fluid is then poured into the aluminum foil casing, heat-sealed, and baked at 80°C for 12 hours. The film is then peeled off for further processing. However, traditional acrylic adhesives undergo a significant high-temperature tackification process during this process, with an tackification rate exceeding 100%. This tackification makes the subsequent film difficult to peel off, thus compromising the integrity of the aluminum foil.

[0003] Currently, commonly used high-temperature self-adhesive protective films on the market have a multi-layer structure, consisting of a surface layer, an intermediate layer, and a self-adhesive layer. The self-adhesive layer provides the necessary adhesion for the protective film. However, ordinary adhesives, during use, require additional adhesion. A traditional protection method involves adding an expanding material to the adhesive layer. At high temperatures, the particles expand, increasing the gap between the adhesive and the aluminum foil, thereby reducing interfacial adhesion and achieving a less sticky effect. However, this method is difficult to control; the expanding material may detach from the self-adhesive film during aluminum foil transfer. For example, patent CN109294464A discloses a method for preparing a heat-resistant adhesive protective film. It adds a self-expanding microsphere foaming agent to the adhesive layer structure. When the ambient temperature is higher than 80°C, the microspheres expand, which plays a good role in reducing adhesion. However, the finished film prepared by this method has a significant reduction in adhesion at high temperatures. During the high-temperature treatment, the viscosity reduction is too large, resulting in low bonding strength and affecting subsequent processing. Furthermore, due to the significant decrease in viscosity at high temperatures, this protective film has high storage requirements. The warehouse temperature in summer should not exceed 80°C. The severe viscosity reduction makes it unsuitable for use in the production process of power battery cells. Summary of the Invention

[0004] Based on the shortcomings of existing technologies, the purpose of this invention is to provide a high-temperature non-adhesive material, its preparation method, and its application.

[0005] To achieve the above objectives, in a first aspect of the present invention, the present invention provides a self-adhesive layer composition comprising the following components in parts by weight: 25-52 parts of a styrene-based thermoplastic elastomer, 4-28 parts of a tackifying resin, 28-62 parts of a polyolefin substance, and 0.008-1.05 parts of a lubricant.

[0006] The lubricant includes ethylene bis-stearamide;

[0007] The polyolefin material is an ethylene / α-olefin copolymer.

[0008] This invention provides a self-adhesive layer composition. By selecting appropriate mass proportions of components and defining component parameters, the resulting self-adhesive layer composition, when applied to the preparation of subsequent high-temperature non-tackifying materials, produces a product that possesses a certain peel strength while exhibiting a small increase in viscosity after high-temperature treatment, or even a reduction in viscosity. The reduction in viscosity is moderate, ensuring that the prepared product maintains a suitable peel strength range before and after high-temperature treatment, meeting practical application requirements. Specifically, this invention selects ethylene bis-stearamide as a lubricant and an appropriate mass percentage of the matrix resin ethylene / α-olefin copolymer. The copolymer has poor binding ability for small molecules of the lubricant. The synergistic effect of these two components allows the lubricant ethylene bis-stearamide to partially and controllably migrate to the surface of the protective film under high-temperature conditions, forming a thin protective layer between the adhesive layer and the protected surface. This reduces the rivet structure formed by the flow of the protective film, thereby achieving a small increase in viscosity, or even a reduction in viscosity, after high-temperature treatment.

[0009] As a preferred embodiment of the self-adhesive layer composition of the present invention, the mass percentage of the polyolefin substance is ≥35% based on the total mass parts of the styrene-based thermoplastic elastomer, tackifying resin, and polyolefin substance.

[0010] Preferably, based on the total mass percentage of the styrene-based thermoplastic elastomer, tackifying resin, and polyolefin, the mass percentage of the polyolefin is 35-62%.

[0011] The present invention has found that when the total mass percentage of the polyolefin substance, based on the styrene-based thermoplastic elastomer, tackifying resin, and polyolefin substance is within the range given in the present invention, it can better synergize with the lubricant, achieving a finished product with a small increase in viscosity after high-temperature treatment, or even a reduction in viscosity.

[0012] For example, based on the total mass percentage of the styrene-based thermoplastic elastomer, tackifying resin, and polyolefin, the mass percentage of the polyolefin can be 35%, 38%, 40%, 42%, 45%, 48%, 50%, 52%, 55%, 58%, 60%, 62%, etc.

[0013] In a preferred embodiment of the self-adhesive layer composition of the present invention, the polyolefin material is ethylene-butene copolymer (POE).

[0014] In a preferred embodiment of the self-adhesive layer composition of the present invention, the mass percentage of polyolefin substances in the self-adhesive layer composition is 30% or more.

[0015] For example, the self-adhesive layer composition comprises the following components in parts by weight: 27-50 parts of styrene-based thermoplastic elastomer, 5-25 parts of tackifying resin, 30-60 parts of polyolefin, and 0.01-1 parts of lubricant; specifically, the mass parts of the styrene-based thermoplastic elastomer can be any point value or any two points within a range between 27 and 50 parts, such as 27 parts, 29 parts, 31 parts, 33 parts, 35 parts, 37 parts, 39 parts, 41 parts, 43 parts, 45 parts, 47 parts, 49 parts, 50 parts, etc.; the mass parts of the tackifying resin can be any point value or any two points within a range between 5 and 25 parts, such as 5 parts, 8 parts, 10 parts, 12 parts, 15 parts, 18 parts, 20 parts, 23 parts, 25 parts, etc. The mass fraction of the polyolefin substance can be any point value or any two-point range between 30 and 60 parts, such as 30 parts, 32 parts, 35 parts, 38 parts, 40 parts, 42 parts, 45 parts, 47 parts, 50 parts, 52 parts, 55 parts, 58 parts, 60 parts, etc.; the lubricant can be any point value or any two-point range between 0.01 and 1 part, such as 0.01 parts, 0.05 parts, 0.1 parts, 0.15 parts, 0.2 parts, 0.25 parts, 0.3 parts, 0.35 parts, 0.4 parts, 0.45 parts, 0.5 parts, 0.55 parts, 0.6 parts, 0.65 parts, 0.7 parts, 0.75 parts, 0.8 parts, 0.85 parts, 0.9 parts, 0.95 parts, 1 part, etc.

[0016] As a preferred embodiment of the self-adhesive protective film of the present invention, the self-adhesive layer comprises the following components in parts by weight: 30-40 parts of styrene-based thermoplastic elastomer, 10-20 parts of tackifying resin, 40-50 parts of polyolefin substance, and 0.2-0.6 parts of lubricant.

[0017] The inventors discovered that the mass fraction of the components in the self-adhesive layer further affects the material's performance. When the mass fraction of the product components is further optimized to be within the aforementioned range, the resulting material exhibits a smaller increase in peel force before and after high-temperature treatment, and demonstrates a reduced-tack effect. Furthermore, when the components in the self-adhesive layer are within the aforementioned range, the main resin matrix is ​​a polyolefin, which can better synergize with the lubricant, resulting in a smaller increase in viscosity after high-temperature treatment, and even a moderate reduction in viscosity.

[0018] In a preferred embodiment of the self-adhesive protective film of the present invention, the lubricant further includes at least one of polyethylene wax, silicone, organosilicon wax, and polytetrafluoroethylene.

[0019] In a preferred embodiment of the self-adhesive protective film of the present invention, the lubricant is ethylene bis-stearamide and polytetrafluoroethylene.

[0020] In a preferred embodiment of the self-adhesive protective film of the present invention, the lubricant contains 20-80% by mass of ethylene bis-stearamide.

[0021] Preferably, the lubricant contains 30-55% ethylene bis-stearamide by mass.

[0022] This invention has discovered that when at least one of polyethylene wax, silicone, organosilicon wax, and polytetrafluoroethylene is introduced into the lubricant, the introduced substance can interact with ethylene bis-stearamide, thereby allowing more lubricant to migrate to the surface of the protective film during subsequent high-temperature processes. This forms a thin protective layer between the adhesive layer and the protected interface, further reducing the rivet structure formed by material flow and achieving a smaller viscosity increase after high-temperature treatment. In particular, when ethylene bis-stearamide and polytetrafluoroethylene are selected as the lubricant, the resulting product exhibits a more prominent viscosity reduction effect after high-temperature treatment, with a moderate viscosity reduction range, and the viscosity after viscosity reduction meets the requirements of actual production applications.

[0023] As a preferred embodiment of the self-adhesive protective film of the present invention, the styrene-based thermoplastic elastomer is at least one of styrene-butadiene-styrene block copolymer (SBS), styrene-ethylene-butene-styrene block copolymer (SEBS), styrene-isoprene-styrene triblock copolymer (SIS), and hydrogenated styrene-isoprene diblock copolymer (SEPS).

[0024] Preferably, the styrene-based thermoplastic elastomer is SEBS.

[0025] This invention has found that when the styrene-based thermoplastic elastomer is further optimized to be SEBS, the overall performance of the material is even better.

[0026] In a preferred embodiment of the self-adhesive protective film of the present invention, the tackifying resin is at least one of hydrogenated petroleum resin, terpene resin, and rosin ester.

[0027] Preferably, the tackifying resin is a hydrogenated petroleum resin.

[0028] The present invention has found that when the tackifying resin is further specified to be of the type described above, the overall effect of the obtained product is even better.

[0029] In a preferred embodiment of the self-adhesive protective film of the present invention, the melt index of the polyolefin material is 2-15 g / 10 min.

[0030] The melt index of the polyolefin material was determined according to GB / T 3682-2000, specifically at 190℃ and 2.16Kg.

[0031] This invention has found that when the melt index of the polyolefin material is further selected to be 2-15 g / 10 min, not only is the processing performance better, but the high-temperature non-adhesion effect of the resulting protective film is also better. For example, the melt index of the polyolefin material can be any point value or any two points within the range of 2-15 g / 10 min, such as 2 g / 10 min, 3 g / 10 min, 4 g / 10 min, 5 g / 10 min, 6 g / 10 min, 7 g / 10 min, 8 g / 10 min, 9 g / 10 min, 10 g / 10 min, 11 g / 10 min, 12 g / 10 min, 13 g / 10 min, 14 g / 10 min, 15 g / 10 min, etc.

[0032] Preferably, the melt index of the polyolefin is 4-10 g / 10 min.

[0033] In a preferred embodiment of the self-adhesive protective film of the present invention, the number-average molecular weight of the styrene-based thermoplastic elastomer is 30,000-100,000.

[0034] The number-average molecular weight of styrene-based thermoplastic elastomers was characterized using gel permeation chromatography (GPC).

[0035] For example, the number-average molecular weight of the styrene-based thermoplastic elastomer can be any value between 30,000 and 100,000, or any value between any two points. For instance, it can be in the range of 30,000-50,000, 50,000-60,000, 60,000-80,000, or even values ​​such as 30,000, 32,000, 35,000, 38,000, 40,000, 42,000, 45,000, 48,000, 50,000, 52,000, 55,000, 58,000, 60,000, 62,000, 65,000, 68,000, 70,000, 72,000, 75,000, 78,000, 80,000, 82,000, 85,000, 88,000, 90,000, 92,000, 95,000, 98,000, and 100,000. Within the range of 30,000 to 100,000 provided in this invention, the technical effects of this invention can be achieved.

[0036] Preferably, the number-average molecular weight of the styrene-based thermoplastic elastomer is 50,000 to 70,000; within this range, the overall performance of the obtained product is superior.

[0037] In a preferred embodiment of the self-adhesive protective film of the present invention, the softening point of the tackifying resin is 80-150°C.

[0038] Preferably, the softening point of the tackifying resin is 90-125℃.

[0039] The softening point of the tackifying resin was tested according to ASTM E28-2018.

[0040] For example, the softening point of the tackifying resin may be 90°C, 95°C, 100°C, 105°C, 110°C, 115°C, 120°C, 125°C, etc.

[0041] In a preferred embodiment of the self-adhesive layer assembly of the present invention, the self-adhesive layer further includes 0-1 parts of processing aid.

[0042] Preferably, the processing aid includes at least one of antioxidants and weather-resistant agents.

[0043] For example, the antioxidant may be at least one of RIANOX 1010, SONOX 168, and IRGANOX 245, and the weathering agent may be at least one of RIASORB UV-P, RIASORB UV-234, and CHIGUARD 5411.

[0044] In a second aspect, the present invention provides a high-temperature non-adhesive material comprising, from bottom to top, a self-adhesive layer, a core layer and a surface layer, wherein the self-adhesive layer comprises the self-adhesive layer composition described in the present invention.

[0045] In a preferred embodiment of the high-temperature non-adhesive material of the present invention, the thickness of the self-adhesive layer is 5-15 μm, and the thickness ratio of the self-adhesive layer, the core layer and the surface layer is 1:2-6:1.

[0046] As a preferred embodiment of the high-temperature non-tackifying material of the present invention, the core layer comprises the following components in parts by weight: matrix resin A 99-100 parts, additive A 0-1 parts;

[0047] And / or, the surface layer comprises the following components in parts by weight: 99-100 parts of matrix resin B and 0-1 parts of additive B.

[0048] Preferably, the matrix resin A and matrix resin B are each independently selected from polypropylene or polyethylene, and the additives A and B are each independently selected from at least one of antioxidants, weathering agents, opening agents, and slip agents.

[0049] More preferably, the melt index of the polypropylene or polyethylene is 3-15 g / 10 min. The test conditions for the melt index of the polypropylene are 230°C and 2.16 kg, and the test conditions for the melt index of the polyethylene are 190°C and 2.16 kg.

[0050] The effects of this invention can be achieved within the range of melt flow index of polypropylene or polyethylene given in this invention; for example, the melt flow index of the polypropylene or polyethylene can be 3g / 10min, 4g / 10min, 5g / 10min, 6g / 10min, 7g / 10min, 8g / 10min, 9g / 10min, 10g / 10min, 11g / 10min, 12g / 10min, 13g / 10min, 14g / 10min, or 15g / 10min.

[0051] For example, the antioxidant is at least one of RIANOX 1010, SONOX 168, and IRGANOX 245; the weathering agent is at least one of RIASORB UV-P, RIASORB UV-234, and CHIGUARD 5411; the opening agent is at least one of silica and diatomaceous earth; and the slip agent is at least one of EBS P400, oleamide, Armoslip CP, and erucamide.

[0052] In a third aspect, the present invention provides a method for preparing the high-temperature non-adhesive material, the method comprising the following steps:

[0053] (1) Mix the components of the self-adhesive layer, core layer and surface layer separately to obtain self-adhesive layer premix, core layer premix and surface layer premix;

[0054] (2) Extrude and granulate the self-adhesive layer premix to obtain the self-adhesive layer material;

[0055] (3) The self-adhesive layer material, the core layer premix and the surface layer premix are co-blown into a film to obtain the high-temperature non-adhesive material.

[0056] The method for preparing the high-temperature non-adhesive material described in this invention is simple and can produce products with different layer thicknesses and different overall thicknesses according to actual use needs, with high efficiency for industrial-scale production.

[0057] As a preferred embodiment of the preparation method of the present invention, in step (3), the core layer premix, the surface layer premix and the self-adhesive layer material are respectively fed into the core layer material tank, the surface layer material tank and the self-adhesive layer material tank of the blown film machine, and then co-blown into a film.

[0058] In a preferred embodiment of the preparation method of the present invention, the extrusion granulation temperature in step (2) is 160-190°C.

[0059] In a fourth aspect, the present invention provides the application of the high-temperature non-adhesive material in the protective film for power batteries of new energy vehicles.

[0060] The beneficial effects of this invention are:

[0061] This invention provides a high-temperature non-adhesive material that, while possessing a certain peel strength, exhibits minimal change in peel strength after high-temperature treatment. This is beneficial for peeling after high temperatures and maintaining a certain level of adhesion during high-temperature processes, meeting practical application requirements. Specifically, the peel strength of the obtained product against a standard steel plate, and the peel strength against a standard steel plate after high-temperature treatment, are between 0.25-0.49 N / 25 mm, with the increase in peel strength against a standard steel plate after high-temperature treatment ranging from -24.2% to 13.9%. This invention also provides a method for preparing the aforementioned high-temperature non-adhesive material and its application in protective films for power batteries used in new energy vehicles. Detailed Implementation

[0062] To better illustrate the purpose, technical solution, and advantages of this invention, the invention will be further described below with reference to specific embodiments and comparative examples. The purpose of this description is to provide a detailed understanding of the invention, not to limit its scope. All other embodiments obtained by those skilled in the art without inventive effort are within the protection scope of this invention. Unless otherwise specified, the experimental reagents and instruments designed in the embodiments and comparative examples of this invention are commonly used reagents and instruments; and the raw materials used in the parallel experiments of the embodiments and comparative examples of this invention are consistent.

[0063] The raw materials used in the various embodiments, comparative examples, and effect examples of this invention are as follows:

[0064] SBCs-1: SEBS, number-average molecular weight of 50,000, model SEBS G1645, manufacturer is Kronen;

[0065] SBCs-2: SEPS, with a number-average molecular weight of 70,000, model number SEPS G1730, manufactured by Kronen.

[0066] SBCs-3: SEBS, number-average molecular weight of 80,000, model SEBS G1642, manufacturer is Kronen;

[0067] Tackifying resin-1: Hydrogenated petroleum resin, softening point 90℃, model PZX-H1090, manufacturer Puyang Zhongke;

[0068] Tackifying resin-2: Terpene resin, softening point 124℃, model SYLVARES TR7125, manufacturer is Kraton, USA;

[0069] Tackifying Resin-3: Hydrogenated petroleum resin, softening point 140℃, model HH140, manufacturer Guangdong Xinhua Yue Resin Technology Co., Ltd.

[0070] Polyolefin material-1: POE, melt index 5 g / 10 min, model number POE 7447, manufacturer: Dow Chemical Company, USA;

[0071] Polyolefin material-2: POE, melt index 3g / 10min, model POE 8450, manufacturer: Dow Chemical Company, USA;

[0072] Polyolefin material-3: POE, melt index 14 g / 10 min, model POE 8137, manufacturer: Dow Chemical Company, USA;

[0073] Polyolefin material-4: ethylene-propylene copolymer, melt index of 8 g / 10 min, model VISTAMAXX 3980, manufacturer ExxonMobil, USA;

[0074] Ethylene bis-stearamide 1: EBS dispersant, Shandong Benniu Chemical Co., Ltd.;

[0075] Ethylene bis-stearamide 2: B50, Guangzhou Taili Chemical Co., Ltd.;

[0076] Polyethylene wax: commercially available; Polytetrafluoroethylene: model SN80-SA7, manufactured by Guangzhou Entropy Energy Innovation Materials Co., Ltd.

[0077] Silicone: Commercially available;

[0078] Polyethylene-1: Melt index is 3.5 g / 10 mol, model is LLDPE 3518CA, manufacturer is ExxonMobil, USA;

[0079] Polyethylene-2: Melt index is 15g / 10mol, model is LLDPE 5815, manufacturer is Dow Chemical (USA);

[0080] Antioxidant: A mixture of antioxidant 1010 and antioxidant 168 in a 1:1 mass ratio, commercially available;

[0081] Weather resistant agent: 2-hydroxy-4-n-octyloxybenzophenone, UV-531, commercially available;

[0082] Opening agent: Diatomaceous earth, commercially available;

[0083] Slip agent: Erucamide, commercially available.

[0084] Examples 1-16 and Comparative Examples 1-5

[0085] The present invention provides a high-temperature non-adhesive material in embodiments and comparative examples. The components (parts by weight) of the self-adhesive layer of the high-temperature non-adhesive material are shown in Tables 1-2. The core layer comprises the following components in parts by weight: 89.8 parts polyethylene 1, 10 parts polyethylene 2, 0.1 parts antioxidant, and 0.1 parts weathering agent. The surface layer comprises the following components in parts by weight: 100 parts polyethylene 1, 0.1 parts antioxidant, 0.1 parts weathering agent, 0.5 parts opening agent, and 0.3 parts slip agent.

[0086] Table 1

[0087]

[0088]

[0089] Table 2

[0090]

[0091] The preparation methods of the embodiments and comparative examples of this invention are as follows:

[0092] (1) Mix the components of the self-adhesive layer, core layer and surface layer separately to obtain self-adhesive layer premix, core layer premix and surface layer premix;

[0093] (2) Extrude and granulate the self-adhesive layer premix to obtain the self-adhesive layer material;

[0094] (3) The core layer premix, the surface layer premix and the self-adhesive layer material are respectively fed into the core layer material tank, the surface layer material tank and the self-adhesive layer material tank of the blown film machine, and then co-blown into a film;

[0095] In Examples 1-16 and Comparative Examples 1-5, the thickness of the self-adhesive layer is 5 μm, and the thickness ratio of the self-adhesive layer, core layer, and surface layer is 1:3:1.

[0096] Example of effect

[0097] The peel strength of the high-temperature non-adhesive materials prepared in Examples 1-16 and Comparative Examples 1-5 was verified by the following examples: After the high-temperature non-adhesive materials were bonded to the substrates, their peel strength against standard steel plates was tested according to GB / T2792-2014. Then, the same batch of test materials were placed at 80°C for 12 hours and their peel strength against standard steel plates was tested according to GB / T2792-2014. The increase in peel strength after high-temperature treatment was calculated as follows: increase = (peel strength after high-temperature treatment - peel strength before high-temperature treatment) / peel strength before high-temperature treatment * 100%. The results are shown in Table 3.

[0098] Table 3

[0099]

[0100]

[0101] As can be seen from Table 3, the viscosity change rate of the product obtained by adopting the technical solution of the present invention is small after high temperature treatment, ranging from -24.2% to 12.0%. That is, the product prepared by the technical solution of the present invention has a good high temperature non-tackification effect. Furthermore, since the viscosity change rate of the technical solution provided by the present invention is small before and after high temperature treatment, the peel force can be maintained between 0.25-0.49 N / 25 mm before and after high temperature treatment, avoiding the impact of excessive viscosity change rate before and after treatment on the bonding performance.

[0102] As can be seen from Examples 1-3, the mass fraction of the self-adhesive layer components affects the product performance. When the optimal composition is further optimized with 30-40 parts of styrene-based thermoplastic elastomer, 10-20 parts of tackifying resin, 40-50 parts of polyolefin, and 0.2-0.6 parts of lubricant, the resulting product exhibits superior overall performance. As can be seen from Examples 1 and Comparative Example 1, when no lubricant is added, the viscosity of the prepared product increases significantly after high-temperature treatment, reaching an increase of 97.4%, leading to ineffective peeling during subsequent applications. As can be seen from Examples 1 and Comparative Example 3, when too much lubricant is added, the viscosity change rate of the resulting product after high-temperature treatment is too large, resulting in a low peeling force of only 0.04 N / 25 mm, which cannot meet the actual application requirements of the product. As can be seen from Examples 1 and Comparative Example 4, when too much polyolefin is added, the peeling force of the resulting product before high-temperature treatment is low, only 0.08 N / 25 mm, which also cannot meet the actual application requirements of the product.

[0103] As can be seen from Examples 1, 4-7, and Comparative Example 2, the type of lubricant affects the high-temperature viscosity-increasing effect of the product. When the lubricant is further selected as either ethylene bis-stearamide or polyethylene wax or polytetrafluoroethylene, the viscosity of the obtained product shows a moderate decreasing trend after high-temperature treatment. When the lubricant used in Comparative Example 2 is not the lubricant of this invention, the high-temperature viscosity-increasing effect of the obtained product is obvious, and the viscosity increases by 71.9% after high-temperature treatment. As can be seen from Examples 1 and 8-10, the mass ratio of ethylene bis-stearamide to other lubricants also affects the high-temperature viscosity-increasing ability of the product. When the mass percentage of ethylene bis-stearamide in the lubricant is further selected as 30-55%, the viscosity of the obtained product shows a moderate decreasing trend after high-temperature treatment, that is, while maintaining the decrease, it does not lead to excessively low peel force after high-temperature treatment, thus affecting practical applications.

[0104] As can be seen from Examples 1 and 11-14, the selection of SBCs and tackifying resins also has a certain impact on the high-temperature tackifying ability and peeling force of the product. When the parameters of SBCs and tackifying resins are further optimized within the range given in this invention, the viscosity of the obtained product after high-temperature treatment can show a suitable downward trend.

[0105] As can be seen from Examples 1, 15-16 and Comparative Example 5, the type of polyolefin and its melt index also affect the overall performance of the product. When the selected polyolefin is not POE in this invention, the peel strength of the obtained product changes significantly at high temperature, with an increase of 146.2%. When the melt index of the selected polyolefin is within the preferred range of this invention, the viscosity of the obtained product after high-temperature treatment shows a suitable decreasing trend.

[0106] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A self-adhesive layer composition, characterized in that, The self-adhesive layer composition comprises the following components by weight: styrene thermoplastic elastomer 29-37 parts, tackifying resin 10-20 parts, polyolefin substance 40-50 parts, lubricant 0.2-0.6 parts; The lubricant is ethylene bis-stearamide and polytetrafluoroethylene; The polyolefin substance is ethylene / α-olefin copolymer.

2. The self-adhesive layer composition according to claim 1, wherein The mass percentage of ethylene bis-stearamide in the lubricant is 20-80%.

3. The self-adhesive layer composition according to claim 1, wherein At least one of (a)-(f): (a) The styrene thermoplastic elastomer is at least one of SBS, SEBS, SIS, SEPS; (b) The tackifying resin is at least one of hydrogenated petroleum resin, terpene resin, rosin ester; (c) The polyolefin substance has a melt index of 2-15 g / 10 min; (d) The styrene thermoplastic elastomer has a number average molecular weight of 30,000-100,000; (e) The tackifying resin has a softening point of 80-150℃; (f) The polyolefin substance is ethylene-butene copolymer.

4. A high temperature no-flow material characterized by, From bottom to top, sequentially comprising a self-adhesive layer, a core layer and a surface layer, the self-adhesive layer comprises the self-adhesive layer composition according to any one of claims 1-3.

5. The elevated temperature no-adhesion material of claim 4, wherein, The thickness of the self-adhesive layer is 5-15 μm, and the thickness ratio of the self-adhesive layer, the core layer and the surface layer is self-adhesive layer:core layer:surface layer=1:2-6:1; And / or, the core layer comprises the following components by weight: base resin A 99-100 parts, auxiliary A 0-1 parts; And / or, the surface layer comprises the following components by weight: base resin B 99-100 parts, auxiliary B 0-1 parts.

6. The method of making a high temperature, no-flow adhesive material according to any one of claims 4-5, wherein, Comprising the following steps: (1) mixing the components of the self-adhesive layer, the core layer and the surface layer respectively to obtain self-adhesive layer premix, core layer premix and surface layer premix; (2) extruding and granulating the self-adhesive layer premix to obtain self-adhesive layer material; (3) co-blowing the self-adhesive layer material, the core layer premix and the surface layer premix to obtain the high-temperature non-tackifying material.

7. Use of the high-temperature non-tackifying material according to any one of claims 4-5 in the protection film of power battery for new energy vehicles.

Images