A TPU composite material for new energy batteries and its preparation method

Abstract

This application relates to the field of polyurethane membrane materials for batteries, and discloses a TPU composite material for new energy batteries and its preparation method. The TPU composite material for new energy batteries consists of a cloth film layer, an adhesive film layer, and a TPU film layer. The TPU film layer is obtained by melt casting of TPU hot melt adhesive, which is made from the following raw materials in parts by weight: 60-80 parts of polyurethane elastomer, 20-30 parts of toughening agent, 15-25 parts of flame retardant, 8-15 parts of thermal conductive agent, 2-4 parts of lubricant, and 1-3 parts of antioxidant. The toughening agent is composed of POE elastomer, long-chain alkyl glycidyl ether, itaconic acid dibutyl ester, and vinyl dimethyl-terminated dimethyl-methyltrifluoropropyl polysiloxane copolymer. The TPU composite material of this application, when applied to new energy batteries, exhibits good cushioning and shock absorption, puncture resistance, flame retardancy, and thermal conductivity.

Description

Technical Field

[0001] This application relates to the field of polyurethane membrane materials for batteries, and more specifically, it relates to a TPU composite material for new energy batteries and a method for preparing the same. Background Technology

[0002] As the power source for new energy vehicles, new energy batteries need to possess excellent physical and chemical properties and a long service life. Due to the limited internal space in new energy vehicles, new energy batteries must be closely arranged and connected to form battery packs.

[0003] When new energy vehicles operate under alternating driving conditions such as high speed, low speed, acceleration, and deceleration, the battery pack discharges at different rates, generating a large amount of heat. This heat accumulates unevenly over time and due to spatial factors. If the battery pack cannot dissipate heat in time, it can lead to excessively high system temperature or uneven temperature distribution, reducing the battery's charge-discharge cycle efficiency. In severe cases, it can even cause thermal runaway, affecting the battery's safety and reliability. Furthermore, during operation, new energy vehicles encounter bumpy road conditions, causing the battery pack to be subjected to occasional impacts, which can easily lead to punctures and damage, affecting the safety performance and lifespan of the battery pack.

[0004] To address the aforementioned issues, existing technologies optimize the structure of new energy batteries by coating them with a protective film, which provides better protection. This protective film is typically a single-layer insulating PVC film or polyurethane film. While it offers good protection and insulation, this type of film has poor shock absorption and puncture resistance, and also exhibits low thermal conductivity, resulting in low protection efficiency for the new energy battery. Summary of the Invention

[0005] To address the problem that existing protective films used in new energy batteries have poor shock absorption and puncture resistance, as well as low thermal conductivity, thus reducing the protection efficiency of new energy batteries, this application provides a TPU composite material for new energy batteries and its preparation method.

[0006] In a first aspect, this application provides a TPU composite material for new energy batteries, employing the following technical solution:

[0007] A TPU composite material for new energy batteries comprises a fabric film layer, an adhesive film layer, and a TPU film layer. The TPU film layer is obtained by melt casting of TPU hot melt adhesive, which is made from the following raw materials in parts by weight:

[0008] 60-80 parts of polyurethane elastomer

[0009] 20-30 parts toughening agent

[0010] 15-25 parts flame retardant

[0011] 8-15 parts of thermal conductive agent

[0012] 2-4 parts lubricant

[0013] Antioxidant 1-3 parts;

[0014] The toughening agent is composed of POE elastomer, long-chain alkyl glycidyl ether, itaconic acid dibutyl ester, and vinyl dimethyl-terminated dimethyl-methyltrifluoropropyl polysiloxane copolymer.

[0015] By adopting the above technical solution, the TPU composite material of this application consists of a cloth film layer, an adhesive film layer, and a TPU film layer. The cloth film layer can improve the mechanical strength and puncture resistance of the TPU composite material. Under the action of the adhesive film layer, the cloth film layer and the TPU film layer are tightly and stably bonded together. The TPU film layer has excellent mechanical strength, flame retardancy, and flexibility, and can effectively absorb and disperse external impact forces, significantly improving the safety of new energy batteries under high temperature conditions and bumpy road conditions. At the same time, the TPU film layer can effectively conduct and dissipate the heat generated by the battery, avoiding performance degradation or even thermal runaway caused by local overheating.

[0016] This application uses polyurethane elastomer as a thermoplastic elastomer material, and combines it with toughening agents, flame retardants, thermal conductive agents, lubricants and antioxidants to prepare TPU hot melt adhesive. TPU film is obtained by hot melt casting of TPU hot melt adhesive. Polyurethane elastomer has excellent elasticity and mechanical properties, which can provide excellent elasticity for TPU film. The toughening agent is composed of POE elastomer, long-chain alkyl glycidyl ether, itaconic acid dibutyl ester, and vinyl dimethyl-terminated dimethyl-methyltrifluoropropyl polysiloxane copolymer. POE elastomer has excellent toughness and impact resistance, which can reinforce the performance of polyurethane elastomer. Long-chain alkyl glycidyl ether and itaconic acid dibutyl ester both have excellent flexibility, which can further produce a good synergistic effect with vinyl dimethyl-terminated dimethyl-methyltrifluoropropyl polysiloxane. They are interwoven and dispersed in POE elastomer, further improving the temperature resistance and flexibility of POE elastomer. The obtained POE elastomer can further improve the flexibility and impact resistance of polyurethane elastomer, while also further improving the dispersion uniformity of flame retardant and thermal conductive agent with the system. This improves the adhesion stability, mechanical strength, thermal conductivity and flame retardancy of the obtained TPU film layer. As a result, the TPU composite material obtained in this application has excellent shock absorption and puncture resistance, while also having good flame retardancy and thermal conductivity.

[0017] Preferably, the toughening agent is prepared from the following raw materials in parts by weight:

[0018] 120-150 parts of POE elastomer

[0019] 10-15 parts of long-chain alkyl glycidyl ether

[0020] 8-12 parts of dibutyl itaconic acid

[0021] 5-8 parts of vinyl dimethyl-terminated dimethyl-methyltrifluoropropyl polysiloxane copolymer; the long-chain alkyl glycidyl ether is dodecyl glycidyl ether and / or tetradecyl glycidyl ether.

[0022] Preferably, the toughening agent is prepared by the following steps:

[0023] A toughening agent was prepared by melt extrusion granulation of POE elastomer, long-chain alkyl glycidyl ether, itaconic acid dibutyl ester, and vinyl dimethyl-terminated dimethyl-methyltrifluoropropyl polysiloxane copolymer.

[0024] By adopting the above technical solution and optimizing the proportions and dosages of each component in the toughening agent and the preparation process of the toughening agent, the overall performance of the obtained TPU film, such as mechanical strength, flame retardancy, and thermal conductivity, can be further improved.

[0025] Preferably, the flame retardant is composed of melamine cyanurate, ammonium phosphate and magnesium hydroxide in a weight ratio of (0.2-0.4):1:(1-2).

[0026] By adopting the above technical solution, using melamine cyanurate, ammonium phosphate, and magnesium hydroxide in a more optimized weight ratio as flame retardants, it helps to quickly dissipate the heat generated by the battery pack, preventing the risk of battery performance degradation or even thermal runaway due to excessive temperature. Furthermore, it can effectively suppress the spread of flames in the event of combustion, improving the overall safety of new energy batteries.

[0027] Preferably, the thermal conductive agent is a combination of at least two of boron nitride, aluminum nitride, and silicon carbide.

[0028] By adopting the above technical solution, the above thermal conductive agent has excellent thermal conductivity and good dispersion compatibility with polyurethane elastomer, which can significantly improve the thermal conductivity of TPU composite materials.

[0029] Preferably, the fabric membrane layer is any one of nylon fabric or polypropylene fiber fabric.

[0030] By adopting the above technical solution, the film layer is made of nylon cloth or polypropylene fiber cloth, which can effectively improve the mechanical strength and durability of TPU composite materials and enhance the puncture resistance and shock absorption of TPU composite materials.

[0031] Preferably, the adhesive film layer is a polyurethane adhesive film layer, which is obtained by curing polyurethane adhesive, and the polyurethane adhesive is obtained from the following raw materials in parts by weight:

[0032] 30-40 parts of diisocyanate

[0033] 8-12 parts of polyether diol

[0034] 10-15 parts of polycaprolactone diol

[0035] 5-10 parts of chain extender

[0036] Catalyst 0.2-0.4 parts.

[0037] Preferably, the chain extender is composed of hydroxyl polyethylene glycol acrylamide and castor oil-modified polyol in a weight ratio of 1:(2-3).

[0038] By adopting the above technical solution, the adhesive film layer of this application is a polyurethane adhesive film. This application uses a preferred weight ratio of hydroxyl-modified polyethylene glycol acrylamide and castor oil-modified polyol as chain extenders to introduce amide groups and soft castor oil segments into the polyurethane system, thereby improving the bonding stability between the fabric layer and the TPU film layer. Simultaneously, the preferred ratio and selection of the chain extender components further enhance the flexibility of the adhesive film layer, thereby improving the shock absorption and puncture resistance of the resulting TPU composite material.

[0039] Preferably, the thickness of the adhesive film layer is 5-10 μm, and the thickness of the TPU film layer is 20-30 μm.

[0040] By adopting the above technical solutions, the thickness of the adhesive film layer is controlled within the range of 5-10μm, ensuring good adhesion and flexibility. The thickness of the TPU film layer is controlled within the range of 20-30μm, ensuring sufficient thermal conductivity and shock absorption capacity, which helps to quickly dissipate the heat generated by the battery, reduce the performance degradation of the battery pack caused by uneven temperature, and improve the safety and reliability of the battery pack.

[0041] Secondly, this application provides a method for preparing TPU composite materials for new energy batteries, employing the following technical solution:

[0042] A method for preparing a TPU composite material for new energy batteries includes the following steps:

[0043] S1. Apply polyurethane adhesive to the surface of the fabric film layer and dry it to form an adhesive film layer;

[0044] S2. Melt and cast TPU hot melt adhesive onto the surface of the adhesive film layer, cool, and roll up to obtain a TPU composite material for new energy batteries.

[0045] By adopting the above technical solution, polyurethane adhesive is first coated onto the film layer and dried, and then TPU hot melt adhesive is cast and bonded to the film layer. This preparation process can effectively improve the bonding strength and heat resistance of TPU composite materials, while ensuring good thermal conductivity and mechanical properties, thereby improving the safety and service life of new energy batteries.

[0046] In summary, this application includes at least one of the following beneficial technical effects:

[0047] 1. The TPU composite material for new energy batteries of this application consists of a cloth film layer, an adhesive film layer, and a TPU film layer. The TPU film layer uses polyurethane elastomer as the thermoplastic elastomer material, compounded with toughening agents, flame retardants, thermal conductive agents, lubricants, and antioxidants to prepare a TPU hot melt adhesive. This hot melt adhesive is obtained by hot melt casting. The toughening agent consists of POE elastomer, long-chain alkyl glycidyl ether, itaconic acid dibutyl ester, and vinyl dimethyl-terminated dimethyl-methyltrifluoropropyl polysiloxane copolymer. These three components exhibit good... The synergistic effect, interwoven and dispersed in the POE elastomer, further improves the temperature resistance and flexibility of the POE elastomer. The resulting POE elastomer not only further improves the flexibility and impact resistance of the polyurethane elastomer, but also further enhances the dispersion uniformity of the flame retardant and thermal conductive agent with the system. This, in turn, improves the adhesion stability, mechanical strength, thermal conductivity, and flame retardancy of the resulting TPU film. As a result, the TPU composite material obtained in this application has excellent shock absorption and puncture resistance, while also exhibiting good flame retardancy and thermal conductivity.

[0048] 2. The adhesive film layer of this application is a polyurethane adhesive film. This application uses hydroxyl-modified polyethylene glycol acrylamide and castor oil modified polyol in a preferred weight ratio as chain extenders to introduce amide groups and soft castor oil segments into the polyurethane system, thereby improving the bonding stability between the fabric layer and the TPU film layer. At the same time, the preferred ratio and selection of chain extenders further improve the flexibility of the adhesive film layer, thereby improving the shock absorption and puncture resistance of the obtained TPU composite material.

[0049] 3. The preparation process of this application is simple and easy to operate, suitable for industrial continuous production, and produces TPU composite materials with stable performance. Detailed Implementation

[0050] The present application will be further described in detail below with reference to the embodiments.

[0051] The following are some of the sources and specifications of the raw materials used in this application. The raw materials used in the preparation examples and embodiments of this application can all be obtained commercially, including but not limited to the following models and manufacturers of raw materials. Raw materials with equivalent performance can also be used:

[0052] 1. Polyurethane elastomer: BASF 1198A (Germany);

[0053] 2. POE elastomer: Dow 8411;

[0054] 3. Vinyl dimethyl-terminated dimethyl-methyltrifluoropropyl polysiloxane copolymer: Sisbo Organosilicon,

[0055] 4. Melamine cyanurate: CAS No. 37640-57-6, Greenlink Chemicals, FR-MC25S;

[0056] 5. Nylon fabric: Specification 210D, weight 143g, thickness 18mm, plain weave, Suzhou Wenchangxiang Textile Co., Ltd.

[0057] 6. Polyether diol: Polytetramethylene ether diol, molecular weight 1000-2000;

[0058] 7. Polycaprolactone diol: molecular weight 2000-3000;

[0059] 8. Hydroxy-coated polyethylene glycol acrylamide: molecular weight 600-800;

[0060] 9. Castor oil modified polyol: Guangzhou Chubu Chemical Co., Ltd., THCM-1300.

[0061] Preparation example of toughening agent

[0062] Preparation Example 1

[0063] Preparation Example 1 discloses a toughening agent, which is prepared by the following steps:

[0064] 12 kg of POE elastomer, 1.5 kg of dodecyl glycidyl ether (as a long-chain alkyl glycidyl ether), 0.8 kg of itaconic acid dibutyl ester, and 0.5 kg of vinyl dimethyl-terminated dimethyl-methyltrifluoropropyl polysiloxane copolymer were melt-extruded using a screw extruder. The melt extrusion temperatures were controlled as follows: Zone 1 temperature 80℃, Zone 2 temperature 80℃, Zone 3 temperature 85℃, Zone 4 temperature 90℃, Zone 5 temperature 85℃, and die temperature 80℃. After extrusion, the mixture was cooled and pelletized to obtain the toughening agent.

[0065] Preparation Examples 2-3

[0066] The difference between Preparation Example 2-3 and Preparation Example 1 lies in the amount of raw materials used and the preparation conditions, as detailed in Table 1 below.

[0067] Table 1. Parameters for Preparation Examples 1-3

[0068]

[0069]

[0070] Preparation of Comparative Example 1

[0071] The difference between Comparative Example 1 and Preparation Example 1 is that dodecyl glycidyl ether was replaced with an equal amount of methyl glycidyl ether, otherwise the same as Preparation Example 1.

[0072] Preparation of Comparative Example 2

[0073] The difference between Comparative Example 2 and Preparation Example 1 is that dibutyl itaconic acid was replaced with an equal amount of dodecyl glycidyl ether, otherwise the same as Preparation Example 1.

[0074] Preparation of Comparative Example 3

[0075] The difference between Comparative Example 3 and Preparation Example 1 is that vinyl dimethyl-terminated dimethyl-methyltrifluoropropyl polysiloxane copolymer was replaced with vinyl triethoxysilane in equal amounts, while the rest was the same as Preparation Example 1.

[0076] Example of TPU hot melt adhesive preparation

[0077] Preparation Example 4

[0078] Preparation Example 4 discloses a TPU hot melt adhesive, which is prepared by the following steps:

[0079] 6 kg of polyurethane elastomer, 3 kg of toughening agent prepared in Preparation Example 1, 1.5 kg of flame retardant (composed of melamine cyanurate, ammonium phosphate and magnesium hydroxide in a weight ratio of 0.2:1:1), 1.5 kg of thermal conductive agent (composed of boron nitride and aluminum nitride in a weight ratio of 2:1), 0.2 kg of stearic acid as a lubricant and 0.1 kg of antioxidant (composed of antioxidant 1010 and antioxidant 168 in a weight ratio of 2:1) were added to a screw extruder. The melt temperature was controlled as follows: Zone 1 temperature 220℃, Zone 2 temperature 225℃, Zone 3 temperature 230℃, Zone 4 temperature 235℃, Zone 5 temperature 225℃ and die temperature 220℃. The mixture was melt extruded, cooled, and pelletized to obtain TPU hot melt adhesive.

[0080] Preparation Examples 5-6

[0081] The difference between Preparation Examples 5-6 and Preparation Example 1 lies in the amount of raw materials used and the preparation conditions, as detailed in Table 2 below.

[0082] Table 2 Parameter table for preparation examples 4-6

[0083]

[0084]

[0085] Preparation Example 7

[0086] The difference between Preparation Example 7 and Preparation Example 4 is that the toughening agent is derived from Preparation Comparative Example 1, while the rest is the same as Preparation Example 4.

[0087] Preparation Example 8

[0088] The difference between Preparation Example 8 and Preparation Example 4 is that the toughening agent is derived from Preparation Comparative Example 2, while the rest is the same as Preparation Example 4.

[0089] Preparation Example 9

[0090] The difference between Preparation Example 9 and Preparation Example 4 is that the toughening agent is derived from Preparation Comparative Example 3, while the rest is the same as Preparation Example 4.

[0091] Preparation Example 10

[0092] The difference between Preparation Example 10 and Preparation Example 4 is that the toughening agent is SBS thermoplastic elastomer, and the SBS thermoplastic elastomer is Baling Petrochemical YH-815. Otherwise, they are the same as Preparation Example 4.

[0093] Preparation example of polyurethane adhesive

[0094] Preparation Example 11

[0095] Preparation Example 11 discloses a polyurethane adhesive, which is prepared by the following steps:

[0096] 3 kg of isophorone diisocyanate, 0.8 kg of polyether diol, 1 kg of polycaprolactone diol, 0.5 kg of chain extender (composed of butanediol and castor oil modified polyol in a weight ratio of 1:2) and 0.02 kg of dibutyltin dilaurate were added to a reaction vessel as catalysts, heated to 80°C, and reacted for 2 hours to obtain polyurethane adhesive.

[0097] Preparation Examples 12-13

[0098] The difference between Preparation Examples 12-13 and Preparation Example 1 lies in the amount of raw materials used and the preparation conditions, as detailed in Table 3 below.

[0099] Table 3 Parameter table for preparation examples 11-13

[0100]

[0101]

[0102] Preparation Example 14

[0103] The difference between Preparation Example 14 and Preparation Example 11 is that the chain extender is composed of hydroxyl polyethylene glycol acrylamide and castor oil-modified polyol in a weight ratio of 1:2, while the rest is the same as Preparation Example 11.

[0104] Preparation Example 15

[0105] The difference between Preparation Example 15 and Preparation Example 11 is that the chain extender is composed of hydroxyl polyethylene glycol acrylamide and castor oil-modified polyol in a weight ratio of 1:3, while the rest is the same as Preparation Example 11.

[0106] Example

[0107] Example 1

[0108] Example 1 discloses a TPU composite material for new energy batteries, which consists of a cloth film layer, an adhesive film layer and a TPU film layer. The cloth film layer can be any one of nylon cloth or polypropylene fiber cloth. Preferably, the cloth film layer in Example 1 is nylon cloth, the adhesive film layer has a thickness of 5 μm, and the TPU film layer has a thickness of 30 μm.

[0109] The TPU composite material used in new energy batteries is prepared by the following steps:

[0110] S1. The polyurethane adhesive obtained in Preparation Example 1 is coated onto the surface of the cloth film layer and dried to form an adhesive film layer with a thickness of 5 μm.

[0111] S2. The TPU hot melt adhesive obtained in Preparation Example 4 is hot melted and extruded at a screw speed of 20 r / min to form a TPU film with a thickness of 30 μm. The film is then rolled and bonded to the surface of the adhesive film layer. After rolling and cooling, the film is wound up to obtain a TPU composite material for new energy batteries.

[0112] Example 2-3

[0113] The difference between Examples 2-3 and Example 1 lies in the different preparation process parameters, as detailed in Table 4 below.

[0114] Table 4 Parameter Table for Examples 1-3

[0115]

[0116] Example 4

[0117] The difference between Example 4 and Example 1 is that the polyurethane adhesive is derived from Preparation Example 14, while the rest is the same as Example 1.

[0118] Example 5

[0119] The difference between Example 5 and Example 1 is that the polyurethane adhesive is derived from Preparation Example 15, while the rest is the same as Example 1.

[0120] Comparative Example

[0121] Comparative Example 1

[0122] The difference between Comparative Example 1 and Example 1 is that the TPU hot melt adhesive was derived from Preparation Example 7, while the rest is the same as Example 1.

[0123] Comparative Example 2

[0124] The difference between Comparative Example 2 and Example 1 is that the TPU hot melt adhesive was derived from Preparation Example 8, while the rest was the same as Example 1.

[0125] Comparative Example 3

[0126] The difference between Comparative Example 3 and Example 1 is that the TPU hot melt adhesive was derived from Preparation Example 9, while the rest was the same as Example 1.

[0127] Comparative Example 4

[0128] The difference between Comparative Example 4 and Example 1 is that the TPU hot melt adhesive was derived from Preparation Example 10, while the rest is the same as Example 1.

[0129] Comparative Example 5

[0130] The difference between Comparative Example 5 and Example 1 is that the TPU hot melt adhesive obtained in Preparation Example 4 was hot melted and extruded at a screw speed of 20 r / min to form a TPU film with a thickness of 30 μm. The film was then directly rolled and bonded to the surface of the fabric film layer. After rolling and cooling, the film was wound up to obtain a TPU composite material for new energy batteries. The fabric film layer was made of nylon fabric.

[0131] Performance testing was conducted on the TPU composite materials prepared in Examples 1-5 and Comparative Examples 1-5 as follows:

[0132] 1. Puncture resistance test:

[0133] Using a puncture strength tester, pressure is applied to the surface of the TPU film layer of the TPU composite material to test the maximum force when the TPU composite material is punctured, which is recorded as the puncture resistance strength (unit: N / mm). Test and record the test results.

[0134] 2. Impact resistance test:

[0135] According to the test method in GB / T 8809, test the impact energy (unit: J) of TPU composite material, and record the test results;

[0136] 3. Flame retardancy test:

[0137] Refer to the UL-94 vertical burning test for the flame retardancy rating of TPU composite materials, test and record the test results;

[0138] 4. Thermal conductivity test:

[0139] According to the test method in ASTM-D5470, test the thermal conductivity of TPU composite material (unit: W / (m·K)), and record the test results;

[0140] The following are the performance test data of the TPU composite materials of Examples 1-5 and Comparative Examples 1-5 of this application, as detailed in Table 5 below.

[0141] Table 5. Data for TPU composite materials of Examples 1-5 and Comparative Examples 1-5

[0142]

[0143] Based on Examples 1-3, Examples 4-5, Comparative Example 5, and Table 5, it can be concluded that using the polyurethane adhesive of this application to prepare the adhesive film layer and bonding the fabric film layer and the TPU film layer results in a TPU composite material with good shock absorption and puncture resistance. In Examples 4-5, the type and ratio of chain extenders in the polyurethane adhesive were optimized, resulting in improved puncture resistance and impact resistance of the TPU composite material. In Comparative Example 1, no adhesive film layer was used, and the fabric film layer and the TPU film layer were directly bonded together. The resulting TPU composite material exhibited reduced impact resistance and puncture resistance, and a slight decrease in thermal conductivity. This may be because the absence of polyurethane adhesive reduced the bonding effect between the fabric film layer and the TPU film layer, thereby reducing the mechanical strength and thermal conductivity of the resulting TPU composite film.

[0144] Combining Examples 1-3 and Comparative Examples 1-4 with Table 5, it can be concluded that using the toughening agent of this application, prepared from POE elastomer, long-chain alkyl glycidyl ether, itaconic acid dibutyl ester, and vinyl dimethyl-terminated dimethyl-methyltrifluoropropyl polysiloxane copolymer, and compounding it with polyurethane elastomer, along with thermal conductive agents and flame retardants, as a TPU...

[0145] The TPU composite material prepared with the film layer exhibits good shock absorption and puncture resistance, as well as good thermal conductivity and flame retardancy. In Comparative Examples 1-3, the types and proportions of toughening additives were changed, resulting in decreased puncture strength and impact energy, as well as reduced thermal conductivity. This may be due to reduced flexibility and dispersion properties between the toughening additives and the polyurethane system, thereby decreasing the flexibility and impact resistance of the TPU film layer. In Comparative Example 4, directly replacing the toughening additives with SBS thermoplastic elastomer resulted in decreased puncture strength and impact energy, along with significantly reduced flame retardancy and thermal conductivity. This may be because the change in toughening additives affected the dispersion compatibility of the flame retardant and thermally conductive agent in the system, thus reducing the mechanical properties, flame retardancy, and thermal conductivity of the TPU composite material.

[0146] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A TPU composite material for new energy batteries, characterized in that: It consists of a fabric film layer, an adhesive film layer, and a TPU film layer. The TPU film layer is obtained by melt casting of TPU hot melt adhesive, which is made from the following raw materials in parts by weight: 60-80 parts of polyurethane elastomer 20-30 parts toughening agent 15-25 parts flame retardant 8-15 parts of thermal conductive agent 2-4 parts lubricant Antioxidant 1-3 parts; The toughening agent is prepared from the following raw materials in parts by weight: 120-150 parts of POE elastomer 10-15 parts of long-chain alkyl glycidyl ether 8-12 parts of dibutyl itaconic acid 5-8 parts of vinyl dimethyl-terminated dimethyl-methyltrifluoropropyl polysiloxane copolymer; the long-chain alkyl glycidyl ether is dodecyl glycidyl ether and / or tetradecyl glycidyl ether; The adhesive film layer is a polyurethane adhesive film layer, which is obtained by curing polyurethane adhesive. The polyurethane adhesive is made from the following raw materials in parts by weight: 30-40 parts of diisocyanate 8-12 parts of polyether diol 10-15 parts of polycaprolactone diol 5-10 parts of chain extender Catalyst 0.2-0.4 parts; The chain extender is composed of hydroxyl polyethylene glycol acrylamide and castor oil-modified polyol in a weight ratio of 1:(2-3).

2. The TPU composite material for new energy batteries according to claim 1, characterized in that: The toughening agent is prepared by the following steps: A toughening agent was prepared by melt extrusion granulation of POE elastomer, long-chain alkyl glycidyl ether, itaconic acid dibutyl ester, and vinyl dimethyl-terminated dimethyl-methyltrifluoropropyl polysiloxane copolymer.

3. The TPU composite material for new energy batteries according to claim 1, characterized in that: The flame retardant is composed of melamine cyanurate, ammonium phosphate and magnesium hydroxide in a weight ratio of (0.2-0.4):1:(1-2).

4. The TPU composite material for new energy batteries according to claim 1, characterized in that: The thermal conductive agent is a combination of at least two of boron nitride, aluminum nitride, and silicon carbide.

5. The TPU composite material for new energy batteries according to claim 1, characterized in that: The fabric layer can be either nylon fabric or polypropylene fiber fabric.

6. The TPU composite material for new energy batteries according to claim 1, characterized in that: The thickness of the adhesive film layer is 5-10µm, and the thickness of the TPU film layer is 20-30µm.

7. A preparation process for a TPU composite material for new energy batteries as described in any one of claims 1-6, characterized in that: Includes the following steps: S1. Apply polyurethane adhesive to the surface of the fabric film layer and dry it to form an adhesive film layer; S2. Melt and cast TPU hot melt adhesive onto the surface of the adhesive film layer, cool, and roll up to obtain a TPU composite material for new energy batteries.

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