Preparation method and application of phase change adhesive film material

Abstract

The invention provides a preparation method and application of a phase change adhesive film material, and belongs to the technical field of material science and engineering. The phase-change adhesive film material is prepared by mixing butyl acrylate, styrene, vinyl acetate, methyl methacrylate, liquid paraffin and other raw materials according to a specific proportion, and customization of different enthalpy values, phase-change temperatures and mechanical properties is realized by adjusting monomer composition. The preparation method comprises the steps of raw material dispersion, polymerization, filtration and the like. The phase change adhesive film material is suitable for lithium battery thermal management, has the characteristics of excellent thermal management performance, good processing performance, environmental protection and energy saving, and can effectively reduce battery temperature fluctuation and improve battery performance and safety. The method has a wide application prospect in the fields of lithium battery manufacturing and other thermal management.

Description

Technical Field

[0001] The present invention relates to the field of material science and engineering technology, and in particular to a method for preparing a phase change adhesive film material and an application thereof. Background Art

[0002] In modern industrial production, especially in the field of lithium battery manufacturing, thermal management is a crucial link. Lithium batteries generate a lot of heat during the charging and discharging process. If the heat cannot be dissipated in a timely and effective manner, it will lead to a decline in battery performance and even cause safety problems. Although traditional heat dissipation methods, such as fan heat dissipation and liquid cooling, can solve the heat dissipation problem to a certain extent, they often have disadvantages such as high cost, complex structure, and high energy consumption.

[0003] In recent years, with the continuous progress of materials science, the application of phase change materials in the field of thermal management has gradually attracted attention. Phase change materials can absorb or release a large amount of heat within a certain temperature range while keeping the temperature relatively stable, so they are very suitable for thermal management of lithium batteries. However, existing phase change materials often have problems such as phase change temperature mismatch, insufficient phase change enthalpy, and poor mechanical properties, which limit their widespread application in lithium battery manufacturing.

[0004] In order to solve the above problems, the present invention proposes a new phase change film material and a preparation method thereof. The material can adjust different enthalpy values ​​and phase change temperatures by adjusting the monomer composition and the ratio of paraffin wax, and has good mechanical properties and processing properties, and is very suitable for thermal management of lithium batteries. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a method for preparing a phase change adhesive film material and an application thereof, which solves the problems raised in the above-mentioned background technology.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: A method for preparing a phase change film material, comprising the following steps:

[0007] (1) Stir the emulsifier and deionized water evenly and add them into a four-necked bottle, introduce nitrogen, and continue to disperse in an 80°C water bath for 30 minutes;

[0008] (2) Add liquid paraffin, vinyl acetate and methyl methacrylate and stir and disperse for 30 minutes;

[0009] (3) Add three quarters of the initiator solution to enter the seed polymerization stage, which is the start time of the reaction;

[0010] (4) 80 minutes after the start of the reaction, add one eighth of the initiator solution and continue the reaction for 10 minutes;

[0011] (5) Add the pre-emulsified mixture of butyl acrylate and styrene monomers dropwise into a four-necked flask. The shell monomers are all added within 4 hours. The remaining initiator aqueous solution is added three times at 170 min, 230 min and 290 min of reaction time.

[0012] (6) Continue the reaction for 70 minutes and then discharge the material. After the emulsion is cooled to room temperature, it is filtered with a sieve to obtain a phase change film material.

[0013] Furthermore, the phase change film material contains the following components by weight: 14%-18% butyl acrylate, 8%-12% styrene, 9%-17% vinyl acetate, 4%-8% methyl methacrylate, 0.8% initiator, 14.63%-20.63% deionized water, 1.5% emulsifier, 0.07% thiol, and 30%-36% liquid paraffin.

[0014] Furthermore, the phase change film material specifically contains the following components by weight: 18% butyl acrylate, 12% styrene, 9% vinyl acetate, 8% methyl methacrylate, 0.8% initiator, 14.63% deionized water, 1.5% emulsifier, 0.07% thiol, and 36% liquid paraffin.

[0015] Furthermore, the phase change film material specifically contains the following components by weight: 14% butyl acrylate, 12% styrene, 17% vinyl acetate, 4% methyl methacrylate, 0.8% initiator, 20.63% deionized water, 1.5% emulsifier, 0.07% thiol, and 30% liquid paraffin.

[0016] Furthermore, the phase change film material specifically contains the following components by weight: 14% butyl acrylate, 8% styrene, 13% vinyl acetate, 12% methyl methacrylate, 0.8% initiator, 20.63% deionized water, 1.5% emulsifier, 0.07% thiol, and 30% liquid paraffin.

[0017] Furthermore, the phase change film material prepared by the above preparation method is used in the production and processing of lithium batteries to absorb the heat of the pole pieces and improve production efficiency.

[0018] The present invention provides a method for preparing a phase change adhesive film material and its application. Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. Excellent thermal management performance: The phase change film material provided by the present invention can absorb or release a large amount of heat within a certain temperature range, effectively reducing the temperature fluctuation of the lithium battery during the charging and discharging process, and improving the performance and safety of the battery.

[0020] 2. Strong customizability: By adjusting the ratio of butyl acrylate, styrene, vinyl acetate, methyl methacrylate and liquid paraffin, the enthalpy value, phase change temperature and mechanical properties of the phase change film material can be flexibly adjusted to meet the thermal management requirements of different lithium batteries.

[0021] 3. Good processing performance: The phase change film material provided by the present invention has good processing performance and can be easily coated on a substrate such as a PET film to form a uniform phase change layer, thereby improving the production efficiency and product quality of lithium batteries.

[0022] 4. Environmental protection and energy saving: Compared with the traditional heat dissipation method, the phase change film material provided by the present invention does not require additional energy consumption, and the material itself is non-toxic and harmless, meeting environmental protection requirements.

[0023] In summary, the phase change film material and preparation method thereof provided by the present invention have broad application prospects in the field of lithium battery manufacturing. They can not only improve the performance and safety of lithium batteries, but also reduce production costs and energy consumption, and have important economic and social benefits. DETAILED DESCRIPTION

[0024] The technical solutions of the present invention are described in detail below through specific embodiments. However, it should be clearly stated that these embodiments are for illustration only and are not to be construed as limiting the scope of the present invention.

[0025] Example 1

[0026] A phase change adhesive film material contains the following components by weight: 18% butyl acrylate, 12% styrene, 9% vinyl acetate, 8% methyl methacrylate, 0.8% initiator, 14.63% deionized water, 1.5% emulsifier, 0.07% mercaptan and 36% liquid paraffin.

[0027] Example 2

[0028] A phase change adhesive film material contains the following components by weight: 14% butyl acrylate, 12% styrene, 17% vinyl acetate, 4% methyl methacrylate, 0.8% initiator, 20.63% deionized water, 1.5% emulsifier, 0.07% mercaptan and 30% liquid paraffin.

[0029] Example 3

[0030] A phase change adhesive film material contains the following components by weight: 14% butyl acrylate, 8% styrene, 13% vinyl acetate, 12% methyl methacrylate, 0.8% initiator, 20.63% deionized water, 1.5% emulsifier, 0.07% mercaptan and 30% liquid paraffin.

[0031] The preparation method of the phase change film material in the above-mentioned embodiment 1, embodiment 2 and embodiment 3 comprises the following steps:

[0032] (1) Stir the emulsifier and deionized water evenly and add them into a four-necked bottle, introduce nitrogen, and continue to disperse in an 80°C water bath for 30 minutes;

[0033] (2) Add liquid paraffin, vinyl acetate and methyl methacrylate and stir and disperse for 30 minutes;

[0034] (3) Add three quarters of the initiator solution to enter the seed polymerization stage, which is the start time of the reaction;

[0035] (4) 80 minutes after the start of the reaction, add one eighth of the initiator solution and continue the reaction for 10 minutes;

[0036] (5) Add the pre-emulsified mixture of butyl acrylate and styrene monomers dropwise into a four-necked flask. The shell monomers are all added within 4 hours. The remaining initiator aqueous solution is added three times at 170 min, 230 min and 290 min of reaction time.

[0037] (6) Continue the reaction for 70 minutes and then discharge the material. After the emulsion is cooled to room temperature, it is filtered with a sieve to obtain a phase change film material.

[0038] The phase change film materials in the above-mentioned Embodiment 1, Embodiment 2 and Embodiment 3 are used in the production and processing of lithium batteries after being manufactured to absorb the heat of the pole pieces and improve the production efficiency.

[0039] The products of the above examples 1, 2 and 3 were coated between two layers of 6um PET films, and the coating thickness of the phase change emulsion layer was 38um. The corresponding properties were tested according to the relevant test standards as follows:

[0040]

[0041] It can be found from the above examples that by adjusting the monomer composition of the phase change emulsion and the proportion of paraffin wax, different enthalpy values, phase change temperatures and phase change layer strengths can be adjusted.

[0042] In summary, the phase change film material and its preparation method have broad application prospects in the field of lithium battery manufacturing. They can not only improve the performance and safety of lithium batteries, but also reduce production costs and energy consumption, and have important economic and social benefits.

Claims

1. A method for preparing a phase change film material, characterized in that: The steps include: (1) Stir the emulsifier and deionized water evenly and add them into a four-necked bottle, introduce nitrogen, and continue to disperse in an 80°C water bath for 30 minutes; (2) Add liquid paraffin, vinyl acetate and methyl methacrylate and stir and disperse for 30 minutes; (3) Add three quarters of the initiator solution to enter the seed polymerization stage, which is the start time of the reaction; (4) 80 minutes after the start of the reaction, add one eighth of the initiator solution and continue the reaction for 10 minutes; (5) Add the pre-emulsified mixture of butyl acrylate and styrene monomers dropwise into a four-necked flask. The shell monomers are all added within 4 hours. The remaining initiator aqueous solution is added three times at 170 min, 230 min and 290 min of reaction time. (6) Continue the reaction for 70 minutes and then discharge the material. After the emulsion is cooled to room temperature, it is filtered with a sieve to obtain a phase change film material.

2. The method for preparing a phase change adhesive film material according to claim 1, characterized in that: The phase change adhesive film material contains the following components by weight: 14%-18% butyl acrylate, 8%-12% styrene, 9%-17% vinyl acetate, 4%-8% methyl methacrylate, 0.8% initiator, 14.63%-20.63% deionized water, 1.5% emulsifier, 0.07% thiol, and 30%-36% liquid paraffin.

3. The method for preparing a phase change adhesive film material according to claim 2, characterized in that: The phase change adhesive film material specifically contains the following components by weight: 18% butyl acrylate, 12% styrene, 9% vinyl acetate, 8% methyl methacrylate, 0.8% initiator, 14.63% deionized water, 1.5% emulsifier, 0.07% thiol, and 36% liquid paraffin.

4. The method for preparing a phase change adhesive film material according to claim 2, characterized in that: The phase change adhesive film material specifically contains the following components by weight: 14% butyl acrylate, 12% styrene, 17% vinyl acetate, 4% methyl methacrylate, 0.8% initiator, 20.63% deionized water, 1.5% emulsifier, 0.07% thiol, and 30% liquid paraffin.

5. The method for preparing a phase change adhesive film material according to claim 2, characterized in that: The phase change adhesive film material specifically contains the following components by weight: 14% butyl acrylate, 8% styrene, 13% vinyl acetate, 12% methyl methacrylate, 0.8% initiator, 20.63% deionized water, 1.5% emulsifier, 0.07% thiol, and 30% liquid paraffin.

6. The phase change film material obtained by the preparation method according to any one of claims 1 to 4, characterized in that: The phase change adhesive film material is used in the production and processing of lithium batteries to absorb the heat of the pole pieces and increase production efficiency.

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