Aluminum-plastic film layering stripping agent and preparation method and use method thereof

Abstract

The invention discloses an aluminum-plastic film layering stripping agent as well as a preparation method and a use method thereof. The aluminum-plastic film layering stripping agent comprises the following raw materials in percentage by weight: 75-85% of acetic acid, 2-5% of sodium dodecyl benzene sulfonate and 12-20% of a mixed solution consisting of absolute ethyl alcohol and petroleum ether. The aluminum-plastic film layering stripping agent provided by the invention can rapidly and conveniently strip a nylon layer and an aluminum layer on the surface of an aluminum-plastic film, so that subsequent further treatment on the aluminum-plastic film is facilitated; the reagent is safe in formula and simple in stripping operation, and does not need to be constantly monitored by operators.

Description

Technical Field

[0001] The invention belongs to the technical field of aluminum-plastic film delamination peeling agents, and in particular relates to an aluminum-plastic film delamination peeling agent and a preparation method and a use method thereof. Background Art

[0002] Soft-pack batteries have been widely used in consumer electronic products, such as smart phones, tablet computers, laptops, digital cameras, etc. With the continuous development of the soft-pack battery market, the safety performance of batteries is also crucial. Soft-pack lithium-ion batteries are mainly composed of positive and negative electrodes, electrolytes, separators, and aluminum-plastic films. The aluminum-plastic film is mainly divided into nylon layer, aluminum layer and polypropylene (PP) layer from the outside to the inside. The nylon layer and the aluminum layer are bonded with an adhesive, and the aluminum layer and the polypropylene layer are bonded with an adhesive containing modified PP. See the literature "Liu Yaming, Wang Yanfei, Huang Lei, Zhou Lianliang, Prediction method of aluminum-plastic film corrosion of lithium-ion batteries, Battery, Vol. 47, No. 1, February 2017".

[0003] The aluminum-plastic film packaging in soft-pack batteries is mainly sealed by a vacuum heat sealer to ensure that the internal environment of the battery is free of water and oxygen. In the prior art, in order to determine the sealing and fusion effect between the inner layer of the aluminum-plastic film and the tab glue, the commonly used method is to directly immerse the soft-pack battery shell made of aluminum-plastic film in an HF solution to corrode the aluminum layer and the nylon layer to leave only the transparent PP layer, and then use a colored penetrant to spray to detect whether the PP layer is damaged. See the document "Liu Yaming, Wang Yanfei, Huang Lei, Zhou Lianliang, Prediction method of aluminum-plastic film corrosion of lithium-ion batteries, Battery, Vol. 47, No. 1, February 2017".

[0004] However, after experiments conducted by the applicant, it was found that the corrosion effect of HF solution on aluminum foil was not as good as recorded in the literature, and incomplete corrosion of the aluminum layer often occurred. In addition, hydrofluoric acid is highly corrosive and volatile, and has a high risk factor for use, causing great harm to the operator. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides an aluminum-plastic film delamination stripping agent and a preparation method and a use method thereof. The aluminum-plastic film delamination stripping agent provided by the present invention can quickly and conveniently strip the nylon layer and the aluminum layer on the surface of the aluminum-plastic film, which is convenient for further processing of the aluminum-plastic film; the agent formula is safe, the stripping operation is simple, and no operator needs to monitor at all times.

[0006] The technical solution adopted by the present invention is as follows:

[0007] The invention discloses an aluminum-plastic film delamination stripping agent, wherein the raw material composition and weight percentage of the aluminum-plastic film delamination stripping agent are: 75-85% of acetic acid, 2-5% of sodium dodecylbenzene sulfonate, and 12-20% of a mixed solution composed of anhydrous ethanol and petroleum ether.

[0008] Furthermore, the volume ratio of anhydrous ethanol to petroleum ether is 1:1-5, preferably 1:2.5.

[0009] The raw material composition and weight percentage of the aluminum-plastic film delamination stripping agent are preferably: 80% acetic acid, 3% sodium dodecylbenzene sulfonate, and 17% mixed solution of anhydrous ethanol and petroleum ether in a volume ratio of 1:2.5.

[0010] The raw material composition and weight percentage of the aluminum-plastic film delamination stripping agent are preferably: 75% acetic acid, 5% sodium dodecylbenzene sulfonate, and 20% mixed solution of anhydrous ethanol and petroleum ether in a volume ratio of 1:2.5.

[0011] The raw material composition and weight percentage of the aluminum-plastic film delamination stripping agent are preferably: 75% acetic acid, 5% sodium dodecylbenzene sulfonate, and 20% mixed solution of anhydrous ethanol and petroleum ether in a volume ratio of 1:2.5.

[0012] Furthermore, the acetic acid can be replaced by citric acid.

[0013] The invention also provides a preparation method of the aluminum-plastic film delamination stripping agent, which comprises mixing and stirring the raw materials in the formula amount evenly. The preparation method is simple and easy to operate.

[0014] The present invention also provides a method for using the aluminum-plastic film delamination stripping agent. The aluminum-plastic film is immersed in the aluminum-plastic film delamination stripping agent for 15 to 20 minutes to strip the nylon layer and the aluminum layer on the surface of the aluminum-plastic film, thereby achieving separation of the nylon layer and the aluminum layer.

[0015] In the aluminum-plastic film delamination stripping agent provided by the present invention, acetic acid is used as a main reaction reagent, and the binder between the nylon layer and the aluminum layer can be quickly dissolved; sodium dodecylbenzene sulfonate is used as a surfactant, which has good surface activity, strong hydrophilicity and lipophilicity, and effectively reduces the tension between the interface of the nylon layer and the aluminum layer to achieve emulsification; a mixed solution composed of anhydrous ethanol and petroleum ether is used as an auxiliary reagent, and the dissolved binder can be effectively dissolved into the solution, thereby ensuring the cleanliness of the material surface and improving the subsequent reaction speed of acetic acid.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The aluminum-plastic film delamination stripping agent provided by the present invention can quickly and conveniently strip the nylon layer and the aluminum layer on the surface of the aluminum-plastic film. After the two are stripped, by spraying or dripping 15-20% volume fraction of dilute hydrochloric acid on the surface of the aluminum layer, the aluminum layer can be quickly corroded within 3 minutes to obtain a transparent PP layer for subsequent testing.

[0018] 2. The aluminum-plastic film delamination stripping agent provided by the present invention has a safe reagent formula, and the stripping operation is simple, and no operator needs to monitor at all times.

[0019] 3. The raw material composition of the aluminum-plastic film delamination stripping agent provided by the present invention is simple, each raw material is a common laboratory reagent, easy to obtain, has a low price cost, is economical and practical, and is easy to prepare and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The peeling condition of the nylon layer and the aluminum layer in the aluminum-plastic film in Example 1;

[0021] Figure 2 The peeling condition of the nylon layer and the aluminum layer in the aluminum-plastic film in Example 2;

[0022] Figure 3 The peeling condition of the nylon layer and the aluminum layer in the aluminum-plastic film in Example 3;

[0023] Figure 4 The peeling condition of the nylon layer and the aluminum layer in the aluminum-plastic film in Comparative Example 1;

[0024] Figure 5 The peeling condition of the nylon layer and the aluminum layer in the aluminum-plastic film in Comparative Example 2;

[0025] Figure 6 The peeling condition of the nylon layer and the aluminum layer in the aluminum-plastic film in Comparative Example 3 is shown. DETAILED DESCRIPTION

[0026] The present invention is described in detail below with reference to the embodiments.

[0027] Example 1

[0028] An aluminum-plastic film delamination stripping agent has the following raw material composition and weight percentage: 80% acetic acid, 3% sodium dodecylbenzene sulfonate, and 17% mixed solution of anhydrous ethanol and petroleum ether in a volume ratio of 1:2.5. The agent is prepared by mixing and stirring the raw materials in the formula evenly.

[0029] Take 300 mL of the aluminum-plastic film delamination stripping agent prepared in this embodiment and put it into a beaker; cut the aluminum-plastic film into long strips, immerse part of it in the stripping agent for soaking, and take it out for observation every 5 minutes; after soaking for 15 minutes, it can be seen that the nylon layer on the surface of the aluminum-plastic film immersed in the stripping agent has been completely separated from the aluminum layer. This stripping agent formula has the shortest corrosion time for the aluminum-plastic film and is the best embodiment. Figure 1 shown.

[0030] Example 2

[0031] An aluminum-plastic film delamination stripping agent has the following raw material composition and weight percentage: 75% acetic acid, 5% sodium dodecylbenzene sulfonate, and 20% mixed solution of anhydrous ethanol and petroleum ether in a volume ratio of 1:2.5. The agent is prepared by mixing and stirring the raw materials in the formula evenly.

[0032] 300 mL of the aluminum-plastic film delamination stripping agent prepared in this embodiment was taken into a beaker; the aluminum-plastic film was cut into long strips, and part of it was immersed in the stripping agent for soaking, and it was taken out and observed every 5 minutes; after soaking for 20 minutes, it can be seen that the nylon layer on the surface of the aluminum-plastic film immersed in the stripping agent has been completely separated from the aluminum layer, as shown in FIG. Figure 2 shown.

[0033] Example 3

[0034] An aluminum-plastic film delamination stripping agent has the following raw material composition and weight percentage: 75% citric acid, 5% sodium dodecylbenzene sulfonate, and 20% mixed solution of anhydrous ethanol and petroleum ether in a volume ratio of 1:2.5. The agent is prepared by mixing and stirring the raw materials in the formula evenly.

[0035] 300 mL of the aluminum-plastic film delamination stripping agent prepared in this embodiment was taken into a beaker; the aluminum-plastic film was cut into long strips, and part of it was immersed in the stripping agent for soaking, and it was taken out and observed every 5 minutes; after soaking for 20 minutes, it can be seen that the nylon layer on the surface of the aluminum-plastic film immersed in the stripping agent has been completely separated from the aluminum layer, as shown in FIG. Figure 3 shown.

[0036] Comparative Example 1

[0037] Use only acetic acid as a stripping agent.

[0038] 300 mL of the aluminum-plastic film delamination stripping agent prepared in this embodiment was taken into a beaker; the aluminum-plastic film was cut into long strips, and part of it was immersed in the stripping agent for soaking, and it was taken out and observed every 5 minutes; when soaking for 60 minutes, the nylon layer and the aluminum layer on the surface of the aluminum-plastic film immersed in the stripping agent were still not seen to be peeled off, such as Figure 4 shown.

[0039] Comparative Example 2

[0040] The raw material composition and weight percentage of the stripping agent are: 85% acetic acid and 15% sodium dodecylbenzene sulfonate.

[0041] 300 mL of the aluminum-plastic film delamination stripping agent prepared in this embodiment was taken into a beaker; the aluminum-plastic film was cut into long strips, and part of it was immersed in the stripping agent for soaking, and it was taken out and observed every 5 minutes; when soaking for 60 minutes, the nylon layer and the aluminum layer on the surface of the aluminum-plastic film immersed in the stripping agent were still not seen to be peeled off, such as Figure 5 shown.

[0042] Comparative Example 3

[0043] The raw material composition and weight percentage of the stripping agent are: 60% acetic acid, 10% sodium dodecylbenzene sulfonate, and 30% mixed solution of anhydrous ethanol and petroleum ether in a volume ratio of 1:2.5.

[0044] 300 mL of the aluminum-plastic film delamination stripping agent prepared in this embodiment was taken into a beaker; the aluminum-plastic film was cut into long strips, and part of it was immersed in the stripping agent for soaking, and it was taken out and observed every 5 minutes; when soaked for 60 minutes, the nylon layer and the aluminum layer on the surface of the aluminum-plastic film immersed in the stripping agent showed signs of reaction, but the nylon layer and the aluminum layer on the surface of the aluminum-plastic film were still not peeled off, such as Figure 6 shown.

[0045] The detailed description of an aluminum-plastic film delamination release agent and its preparation method and use method with reference to the above-mentioned embodiments is illustrative rather than restrictive, and several embodiments can be listed according to the limited scope. Therefore, changes and modifications without departing from the overall concept of the present invention should fall within the scope of protection of the present invention.

Claims

1. An aluminum-plastic film delamination stripping agent, characterized in that: The raw material composition and weight percentage of the aluminum-plastic film delamination stripping agent are: 75-85% acetic acid, 2-5% sodium dodecylbenzene sulfonate, and 12-20% mixed solution of anhydrous ethanol and petroleum ether.

2. The aluminum-plastic film delamination release agent according to claim 1, characterized in that: The volume ratio of anhydrous ethanol and petroleum ether is 1:1~5.

3. The aluminum-plastic film delamination release agent according to claim 1, characterized in that: The volume ratio of anhydrous ethanol and petroleum ether is 1:2.

5.

4. The aluminum-plastic film delamination release agent according to any one of claims 1 to 3, characterized in that: The raw material composition and weight percentage of the aluminum-plastic film delamination stripping agent are: 80% acetic acid, 3% sodium dodecylbenzene sulfonate, and 17% mixed solution composed of anhydrous ethanol and petroleum ether in a volume ratio of 1:2.

5.

5. The aluminum-plastic film delamination release agent according to any one of claims 1 to 3, characterized in that: The raw material composition and weight percentage of the aluminum-plastic film delamination stripping agent are: 75% acetic acid, 5% sodium dodecylbenzene sulfonate, and 20% mixed solution composed of anhydrous ethanol and petroleum ether in a volume ratio of 1:2.

5.

6. The aluminum-plastic film delamination release agent according to any one of claims 1 to 3, characterized in that: The raw material composition and weight percentage of the aluminum-plastic film delamination stripping agent are: 75% acetic acid, 5% sodium dodecylbenzene sulfonate, and 20% mixed solution composed of anhydrous ethanol and petroleum ether in a volume ratio of 1:2.

5.

7. The aluminum-plastic film delamination release agent according to claim 1, characterized in that: The acetic acid was replaced by citric acid.

8. The method for preparing the aluminum-plastic film delamination release agent according to any one of claims 1 to 7, characterized in that: Mix the ingredients in the formula and stir evenly.

9. The method for using the aluminum-plastic film delamination release agent according to any one of claims 1 to 7, characterized in that: The aluminum-plastic film is immersed in the aluminum-plastic film delamination stripping agent for 15 to 20 minutes.

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