A water-based UV insulating coating for soft package battery aluminum plastic film, a preparation method and application thereof

Abstract

The application discloses a kind of water-based UV insulating coating for soft package battery aluminum plastic film and its preparation method and application, belong to coating technical field, including the following weight percentage components: 50~80% water-based UV resin, 5~15% water-based polyolefin emulsion, 0.5~3% di(acetylacetone) titanium diisopropyl titanate, 2~6% photoinitiator, 0.5~3% auxiliary agent, 2~8 fast drying agent, 0~6% flatting agent, 0~15% pigment, 0~10% water;The water-based UV resin is bifunctional aliphatic polyurethane acrylate oligomer dispersion.The water-based UV insulating coating for soft package battery aluminum plastic film has excellent performance water-based UV insulating coating, the water-based UV insulating coating has excellent electrical insulation performance, corrosion resistance and adhesion, simultaneously has excellent bonding adhesion performance, and the adhesion on aluminum plastic film is good, greatly improves the yield of soft package battery.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of paint technology, in particular to a water-based UV insulating coating for soft package battery aluminum plastic film, and a preparation method and application thereof. BACKGROUND

[0002] The aluminum plastic film outside the soft package battery is a multi-layer film structure, and the outermost layer is a nylon layer. After being punched into a shape, the aluminum plastic film for soft package batteries is generally protected by coating glue on the nylon layer to attach PET and PI films, and finally filled with electrolyte. However, this film attachment method is relatively slow, and the multi-layer overlapping at the closed joint is prone to blistering during the battery attachment and use process, and the process is complex.

[0003] Patent CN116102978A discloses a lithium battery soft package aluminum plastic film electrolyte-resistant coating and a preparation method and application thereof. The coating is mainly composed of water-based polyester modified silicone resin, fast-drying water-based alkyd resin, and water-based isocyanate curing agent to improve curing ability and reduce baking curing temperature. However, this scheme requires high-temperature baking at 100-115°C, which poses a potential danger in the battery factory, and electrolyte filling must be performed after the coating is sprayed.

[0004] Therefore, it is necessary to provide a water-based UV insulating coating with good electrical performance, electrolyte resistance, and adhesive performance. SUMMARY

[0005] The present application aims to overcome the shortcomings of the prior art and provide a water-based UV insulating coating for soft package battery aluminum plastic film, a preparation method and application thereof, a water-based UV insulating coating with excellent performance, which has excellent electrical insulation performance, corrosion resistance, and adhesion, as well as excellent adhesive performance, good adhesion on aluminum plastic film, and significantly improved yield of soft package batteries.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the present application is as follows:

[0007] A water-based UV insulating coating for soft package battery aluminum plastic film, comprising the following components by weight percentage: 50-80% water-based UV resin, 5-15% water-based polyolefin emulsion, 0.5-3% di(acetylacetone) titanium diisopropyl titanate, 2-6% photoinitiator, 0.5-3% auxiliary agent, 2-8% fast-drying agent, 0-6% matting agent, 0-15% pigment, and 0-10% water.

[0008] The water-based UV resin is a difunctional aliphatic polyurethane acrylate oligomer dispersion.

[0009] This invention combines the above-mentioned raw materials in a specific ratio to obtain a water-based UV insulating coating with excellent performance. The water-based UV insulating coating has excellent electrical insulation properties, corrosion resistance and adhesion, as well as excellent adhesive properties. It has good adhesion to aluminum-plastic film, which greatly improves the yield of soft-pack batteries.

[0010] Compared with the commonly used insulating film application methods, the water-based UV insulating coating for aluminum-plastic film of soft-pack batteries described in this invention is more convenient, more efficient, and lower in cost. At the same time, different decorative and protective coatings can be quickly prepared by adding different color pastes, making it easier for manufacturers to distinguish and select.

[0011] The water-based UV insulating coating for the aluminum-plastic film of the soft-pack battery of the present invention can be dried / cured by UV at low temperature and in a short time, without the need for high temperature above 100°C (which would damage the soft-pack battery and cause an explosion hazard). Therefore, the final spraying and curing can be carried out after the electrolyte is filled into the soft-pack battery to protect the soft-pack battery, thus saving process steps.

[0012] This invention creatively combines waterborne UV resin and waterborne polyolefin emulsion. The polar groups in the difunctional aliphatic polyurethane acrylate oligomer dispersion and the non-polar carbon chains of the polyolefin emulsion form a uniform dispersed phase through physical entanglement or microscopic phase separation. This effectively eliminates phase separation in the system, improves film stability and uniformity, and enhances coating stability. The difunctional aliphatic polyurethane acrylate oligomer, as a flexible matrix, imparts good ductility and impact resistance to the film, preventing cracking caused by mechanical stress after film formation. The waterborne polyolefin emulsion provides high strength and hardness, and the combination of the two forms a composite film that combines rigidity and flexibility. In the waterborne system, the smaller particle size of the difunctional aliphatic polyurethane acrylate oligomer dispersion helps form a dense and smooth film on the substrate surface. The larger particles in the polyolefin emulsion provide skeletal support for the film. The urethane dispersion fills the micropores between the polyolefin particles, improving the film's density. The aliphatic polyurethane acrylate oligomer dispersion with difunctional groups exhibits high tolerance to acidic and alkaline environments, and the crosslinking of the acrylate further enhances the chemical stability of the membrane. The composite membrane formed by the combination of these two components possesses excellent corrosion resistance. Simultaneously, the compatibility of the waterborne polyolefin emulsion with the plastic matrix allows the coating to bond better with non-polar plastic substrates. Through the synergistic effect of these two components, the performance of the coating is significantly improved, resulting in a high-performance waterborne UV insulating coating. This waterborne UV insulating coating exhibits excellent electrical insulation properties, corrosion resistance, and adhesion, as well as excellent adhesive properties, showing good adhesion to aluminum-plastic films, thus significantly improving the yield rate of pouch batteries.

[0013] As a preferred embodiment of the present application, the viscosity of the aqueous UV resin at 25 DEG C is 80-140 mPa S, and the pH value of the aqueous UV resin is 7.4-7.6.

[0014] As a preferred embodiment of the present application, the viscosity of the aqueous polyolefin emulsion at 25 DEG C is ≤600 mPa S, and the particle size of the aqueous polyolefin emulsion is <300 nm.

[0015] As a preferred embodiment of the present application, the weight ratio of the aqueous UV resin to the aqueous polyolefin emulsion is (5-9) : 1.

[0016] As a preferred embodiment of the present application, the photoinitiator comprises at least one of 1-hydroxycyclohexyl phenyl ketone, 2-methyl-1-(4-methylthiophenyl)-2-morpholinyl-1-propanone, 2-hydroxy-2-methylbenzophenone, and phenyl bis(2,4,6-trimethylbenzoyl) phosphine oxide.

[0017] As a preferred embodiment of the present application, the auxiliary agent comprises at least one of a leveling agent, a defoaming agent, and a wetting agent.

[0018] As a preferred embodiment of the present application, the quick-drying agent comprises at least one of propylene glycol methyl ether, dipropylene glycol methyl ether, and ethanol.

[0019] The matting agent comprises at least one of fumed silica and precipitated silica.

[0020] The pigment comprises at least one of pigment red 254, phthalocyanine blue BGS, carbon black, titanium white, iron red, and iron black.

[0021] The present application also provides a preparation method of the aqueous UV insulating coating for soft package battery aluminum plastic film.

[0022] The aqueous UV resin, the aqueous polyolefin emulsion, the photoinitiator, the auxiliary agent, the quick-drying agent, the pigment, and water are mixed uniformly to obtain the aqueous UV insulating coating for soft package battery aluminum plastic film.

[0023] The present application also provides an application of the aqueous UV insulating coating for soft package battery aluminum plastic film in the field of soft package battery corrosion prevention and insulation.

[0024] As a preferred embodiment of the present application, the electrolyte is filled in the soft package battery, the aqueous UV insulating coating for soft package battery aluminum plastic film is coated on the surface of the nylon layer of the soft package battery aluminum plastic film, and baking is performed at 50-60 DEG C until the moisture is volatilized, and then curing is performed into a film under the irradiation of an ultraviolet lamp to form a corrosion prevention and insulation coating layer.

[0025] The application has the advantages that: (1) the water-based UV insulating coating has excellent electrical insulation performance, corrosion resistance and adhesion, and has excellent bonding adhesion performance, good adhesion on the aluminum plastic film, and greatly improves the yield of the soft package battery.

[0026] (2) The water-based UV insulating coating for the soft package battery aluminum plastic film is more convenient, more efficient and lower in cost compared with the current commonly used insulating film application scheme, and different color paste can be added to quickly adjust different decorative protective coatings, facilitating the selection of manufacturers.

[0027] (3) The water-based UV insulating coating for the soft package battery aluminum plastic film can be dried / UV cured at low temperature for a short time to form a film, without using high temperature (100 DEG C or higher) which can cause damage and explosion danger to the soft package battery, so that the last spraying construction and curing film forming can be carried out after the electrolyte is filled into the soft package battery to realize the protection of the soft package battery, saving the process flow. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme of the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0029] In the present application, the technical features described in an open manner include both the closed technical scheme consisting of the listed features and the open technical scheme containing the listed features.

[0030] In the present application, if no special description is provided, the above numerical range is considered to be continuous and includes the minimum value and the maximum value of the range, and each value between the minimum value and the maximum value. Further, when a range is referred to as an integer, each integer between the minimum value and the maximum value of the range is included. In addition, when multiple ranges are provided to describe a feature or a characteristic, the ranges can be combined. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all sub-ranges included therein.

[0031] In the present application, the specific dispersion and stirring treatment method is not particularly limited.

[0032] The raw materials used in the examples and comparative examples are described as follows:

[0033] Waterborne UV Resin-1: A difunctional aliphatic polyurethane acrylate oligomer dispersion with a viscosity of 110 mPa·s at 25°C. The pH value of the waterborne UV resin is 7.5. It is sourced from Guangdong Yunhai New Materials Co., Ltd., and its brand name is HYF6021.

[0034] Waterborne UV Resin-2: Sourced from Guangzhou Wuxing Materials Technology Co., Ltd., brand name WU3202.

[0035] Waterborne UV Resin-3: Sourced from Guangzhou Haohui New Materials Co., Ltd., brand name CR92001.

[0036] Waterborne UV Resin-3: Sourced from Guangzhou Lankelu New Materials Co., Ltd., brand name L-9821.

[0037] Waterborne polyolefin emulsion-1: viscosity at 25℃ ≤600mPa·S; particle size of the waterborne polyolefin emulsion <300nm, sourced from Jiaxing Ruishi Chemical, grade RS6799.

[0038] Waterborne polyolefin emulsion-2: sourced from Nanjing Tianshi New Materials, brand name Twax-7054.

[0039] Waterborne polyolefin emulsion-3: sourced from Shanghai Haoren International Trade, brand name AC3100.

[0040] Diisopropyl titanate (DI) (acetylacetone): Shanghai Huiyan New Materials, brand name HY-AA-75.

[0041] Photoinitiator: 2-methyl-1-(4-methylthiophenyl)-2-morpholino-1-propanone.

[0042] Wetting agent: BYK346, purchased from BYK.

[0043] Defoamer: Brand 902w, purchased from Digo.

[0044] Leveling agent: BYK-348, purchased from BYK.

[0045] Quick-drying agent: propylene glycol methyl ether.

[0046] Matting agent: Tosoh SILICA Co., Ltd., brand name E-1011.

[0047] Pigment: Phthalocyanine Blue BGS.

[0048] Unless otherwise specified, all components, raw materials, or instruments used in the embodiments and comparative examples of this invention are commercially available, and the same type of components and raw materials are used in each parallel experiment.

[0049] The following embodiments are provided to facilitate understanding of the invention. These embodiments are not intended to limit the scope of the claims.

[0050] Examples 1-6, Comparative Examples 1-9

[0051] The formulations of the water-based UV insulating coating for soft package battery aluminum-plastic film of Examples 1-6 and Comparative Examples 1-9 are shown in Table 1 (all in weight percent).

[0052] The preparation method of the water-based UV insulating coating for soft package battery aluminum-plastic film of Examples 1-6 and Comparative Examples 1-9 includes the following steps:

[0053] The water-based UV resin, water-based polyolefin emulsion, photoinitiator, auxiliary agent, quick-drying agent, pigment, and water are mixed uniformly to obtain the water-based UV insulating coating for soft package battery aluminum-plastic film.

[0054] Table 1

[0055]

[0056]

[0057] Performance test

[0058] The performance of the water-based UV insulating coating obtained in the above examples and comparative examples is characterized, and the specific test items, test methods, and results are as follows:

[0059] The above water-based UV insulating coating is sprayed onto the surface of the soft package battery aluminum-plastic film nylon layer that has been filled with electrolyte and subjected to laser plasma treatment, and is dried at 55°C for 2 min until the water is volatilized, with a dry film thickness of 15±0.5um. Subsequently, it is irradiated and cured into a film under a 1200 mJ / cm 2 of ultraviolet lamp.

[0060] The adhesion is determined according to GB / T9286-1998, wherein the lower the grade value, the better the adhesion; the voltage breakdown resistance is tested using a voltage breakdown tester BJC-50KV according to GB / T 1695-2005; the solvent resistance (95% ethanol) is tested using a BGD rubbing tester with a pressure of 500g and a back-and-forth rubbing test of 30 times per minute, and the coating discoloration is observed; the salt spray resistance (10% NaCl solution) is tested using a BGD rubbing tester with a pressure of 500g and a back-and-forth rubbing test of 30 times per minute, and the coating discoloration is observed, and the test results are shown in Table 2.

[0061] Table 1

[0062]

[0063]

[0064] As can be seen from Table 2, the water-based UV insulating coating described in the application has excellent electrical insulation performance, corrosion resistance and adhesion, and at the same time has excellent bonding adhesion performance, and has good adhesion on the aluminum plastic film, greatly improving the yield of soft package batteries.

[0065] As can be seen from Comparative Examples 2-3 and Examples 1-4, by controlling the weight ratio of the water-based UV resin and the water-based polyolefin emulsion to be (5-9):1, the electrical insulation performance, corrosion resistance and adhesion are further improved.

[0066] As can be seen from Comparative Examples 2, 5-6 and Comparative Examples 1-2, by controlling the amount of the photoinitiator within the range of the application, the electrical insulation performance, corrosion resistance and adhesion are further improved.

[0067] As can be seen from Comparative Example 2 and Comparative Examples 5-7, the application uses a difunctional aliphatic polyurethane acrylate oligomer dispersion as the water-based UV resin, and controls the viscosity thereof at 25℃ to be 80-140 mPa·S, and the pH value of the water-based UV resin is 7.4-7.6, effectively improving the electrical insulation performance, corrosion resistance and adhesion.

[0068] As can be seen from Comparative Example 2 and Comparative Examples 8-9, the application uses a water-based polyolefin emulsion with the brand RS6799, effectively improving the electrical insulation performance, corrosion resistance and adhesion.

[0069] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the application and not to limit the protection scope of the application. Although the application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the application can be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the application.

Claims

1. A water-based UV insulating paint for a pouch battery aluminum laminate film, characterized by, The components include the following weight percentages: 50-80% water-based UV resin, 5-15% water-based polyolefin emulsion, 0.5-3% di(acetylacetone) titanium diisopropyl, 2-6% photoinitiator, 0.5-3% auxiliary agent, 2-8% fast drying agent, 0-6% flatting agent, 0-15% pigment, 0-10% water; The water-based UV resin is a difunctional aliphatic polyurethane acrylate oligomer dispersion; The viscosity of the water-based UV resin at 25℃ is 80-140 mPa·S, and the pH value of the water-based UV resin is 7.4-7.6; The viscosity of the water-based polyolefin emulsion at 25℃ is ≤600 mPa·S, and the particle size of the water-based polyolefin emulsion is <300 nm; The weight ratio of the water-based UV resin to the water-based polyolefin emulsion is (5-9):

1.

2. The water-based UV insulating paint for pouch battery aluminum plastic film according to claim 1, characterized by, The photoinitiator includes at least one of 1-hydroxycyclohexyl phenyl ketone, 2-methyl-1-(4-methylthiophenyl)-2-morpholinyl-1-propanone, 2-hydroxy-2-methylbenzophenone, and phenyl bis(2,4,6-trimethylbenzoyl) phosphine oxide. 3.The water-based UV insulating coating for pouch battery aluminum plastic film according to claim 1, characterized in that, The auxiliary agent includes at least one of a leveling agent, a defoaming agent, and a wetting agent. 4.The water-based UV insulating coating for soft-pack battery aluminum plastic film according to claim 1, characterized in that, The fast drying agent includes at least one of propylene glycol methyl ether, dipropylene glycol methyl ether, and ethanol. The flatting agent includes at least one of fumed silica and precipitated silica. The pigment includes at least one of pigment red 254, phthalocyanine blue BGS, carbon black, titanium dioxide, iron red, and iron black.

5. The method for preparing the water-based UV insulating coating for the pouch battery aluminum plastic film according to any one of claims 1 to 4, characterized in that, The steps include: Mixing the water-based UV resin, the water-based polyolefin emulsion, the photoinitiator, the auxiliary agent, the fast drying agent, the pigment, and water uniformly to obtain a water-based UV insulating coating for soft package battery aluminum plastic film.

6. The application of the water-based UV insulating coating for soft package battery aluminum plastic film in the field of soft package battery corrosion prevention and insulation according to any one of claims 1-4.

7. Use according to claim 6, characterized in that, Filling the electrolyte into the soft package battery, coating the water-based UV insulating coating for soft package battery aluminum plastic film on the surface of the nylon layer of the soft package battery aluminum plastic film, baking at 50-60℃ until the water is volatilized, and curing into a film under the irradiation of an ultraviolet lamp to form a corrosion prevention and insulation coating.

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