UV-curable battery core insulating paint and preparation method thereof

Abstract

The invention discloses a UV-curable battery core insulating paint and a preparation method thereof, and belongs to the technical field of photocureable paints. The UV-curable battery core insulating paint comprises urethane acrylate, self-made vinyl ether modified urethane acrylate, epoxy acrylate, an acrylate monomer, mercaptan, a coupling agent, color paste, a photoinitiator and a leveling agent. The preparation method comprises the following steps: mixing the polyurethane acrylate, the epoxy acrylate, the acrylate monomer and the mercaptan, stirring at normal temperature for 60-120 minutes, adding the coupling agent, the color paste and the flatting agent, stirring at a high speed for 1-3 hours, adding the photoinitiator in a dark place, and stirring for 20-60 minutes to obtain the UV battery core insulating paint. The diluting capacity and the chemical resistance are considered, and the insufficient performance of matrix resin is supplemented; the combination of a photo-initiation system ensures efficient and rapid curing, adaptability to each light source and effective resistance to oxygen inhibition.

Description

Technical Field

[0001] The invention relates to the technical field of photocurable coatings, in particular to a UV-curable battery insulating varnish and a preparation method thereof. Background Art

[0002] With the continuous development of lithium battery technology, lithium battery blue film, as an important component of lithium batteries, is used for the insulation and protection of lithium batteries. Traditional lithium battery blue film uses pressure-sensitive adhesive for bonding, which has the advantages of easy construction and low cost, but has disadvantages such as low bonding force, insufficient strength, low yield, difficult rework, and large rework loss. With the structural changes of the new generation of power batteries, the battery cell can be directly bonded to the PACK cover or the chassis of the vehicle body, and the bonding shear force requirements are further increased, while the bonding performance of the blue film PSA back glue is limited. Therefore, the research and development of an insulating material with good mechanical properties has become an urgent problem that needs to be solved.

[0003] There are already some solutions in the prior art that can be used for lithium battery insulation protection, such as using epoxy powder coating for battery cell protection. Compared with traditional blue film, it greatly improves the shear strength, but there are still problems such as complex construction process, harsh curing conditions, high repair rate, difficult film thickness control, serious waste, etc., and the actual use cost is relatively high.

[0004] The problems existing in the prior art mainly include complex processes and high waste. Traditional powder coatings require a long time of baking and curing at a curing temperature of about 180°C. The shell needs to be sprayed before the battery cell is assembled, and then assembled after completion. The damage during the assembly and transfer process needs to be repaired separately. The whole process has high energy consumption and low yield. Therefore, it is necessary to develop a new type of insulating coating that is easy to apply and cures quickly to meet the use requirements of lithium batteries in complex environments. Summary of the invention

[0005] The purpose of this section is to summarize some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0006] Therefore, the object of the present invention is to provide a UV-curable battery core insulating varnish and a preparation method thereof to solve the problems raised in the above background technology.

[0007] To solve the above technical problems, according to one aspect of the present invention, the present invention provides the following technical solutions: A UV-curable battery insulating varnish, comprising, by weight: Polyurethane acrylate: 20-50 parts, epoxy acrylate: 10-30 parts, self-made vinyl ether modified polyurethane acrylate 20 parts, acrylate monomer: 40-80 parts, thiol: 5-10 parts, coupling agent: 1-5 parts, color paste: 3-5 parts, photoinitiator: 5-10 parts, cationic photoinitiator PAG-201 and PSS-002 composition 0.3 parts, leveling agent: 0.2-1 parts; The ratio of polyurethane acrylate to epoxy acrylate is 1:0.25-0.375, the polyurethane acrylate includes a mixture of CR93115 and B-270, and the epoxy acrylate is L-6117.

[0008] As a preferred embodiment of the UV-curable battery core insulating paint described in the present invention, the acrylate monomer is one or more of isobornyl methacrylate, cyclotrimethylolpropane formal acrylate, tripropylene glycol diacrylate, trimethylolpropane triacrylate, acryloyl morpholine, and dipentaerythritol hexaacrylate.

[0009] As a preferred embodiment of the UV-curable battery core insulating varnish described in the present invention, the thiol is one or more of n-dodecyl mercaptan, tert-dodecyl mercaptan, mercaptoethanol, UV-640, UV-6643, and PE1.

[0010] As a preferred embodiment of the UV-curable battery core insulating paint described in the present invention, the coupling agent is one or more of A-171, A-172, KH570, and A-151.

[0011] As a preferred embodiment of the UV-curable battery core insulating paint described in the present invention, the leveling agent is one or more of BYK333, BYK381, BYK361N, BYK-354, Tego-410, and Tego-450.

[0012] As a preferred embodiment of the UV-curable battery core insulating varnish described in the present invention, the photoinitiator is ITX.

[0013] A method for preparing a UV-curable battery insulating paint, the specific steps are as follows: Weigh 20-50 parts of polyurethane acrylate, 10-30 parts of epoxy acrylate, 20 parts of self-made vinyl ether modified polyurethane acrylate, 40-80 parts of acrylate monomer, and 5-10 parts of mercaptan in proportion, mix and stir at room temperature for 60-120 minutes; Then add 1-5 parts of coupling agent, 3-5 parts of color paste, 0.2-1 parts of leveling agent and stir at high speed for 1-3 hours, add 5-10 parts of photoinitiator and 0.3 parts of the composition of cationic photoinitiator PAG-201 and PSS-002 in a dark environment, stir for 20-60 minutes to obtain UV battery core insulating paint.

[0014] As a preferred embodiment of the method for preparing a UV-curable battery insulating paint according to the present invention, the specific preparation steps of the self-made vinyl ether modified polyurethane acrylate are as follows: Heat the polyol to 65°C-75°C and add diisocyanate to react to the theoretical isocyanate value, then add hydroxy acrylate and hydroxy vinyl ether to cap at 90-95°C; Wherein, the molar ratio of the polyol:isocyanate:hydroxy acrylate:hydroxy vinyl ether is 1.5-2:2.5-3.5:0.75-1.25:1-1.5.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention uses insulating coating to protect the battery cell. Compared with traditional blue film, it has a higher degree of automation, reduces the human risk in the manufacturing process, and also has much higher mechanical properties than blue film. It uses a light curing system with fast curing speed and low energy consumption. Compared with the process of powder coating that requires spraying and curing, assembly, and repair, it can be assembled first and then sprayed and cured, simplifying the production line process.

[0016] 2. The key technical points of the present invention are: the screening and compatibility of photocurable resins to ensure flexibility and strength, and strong resistance to electrolyte and water vapor; the selection of monomers to take into account dilution ability, chemical resistance, and supplementation of the insufficient performance of the main resin; the combination of photoinitiator systems to ensure efficient and rapid curing, adaptability to various light sources, and effective resistance to oxygen inhibition.

[0017] 3. The present invention adopts self-made vinyl ether modified polyurethane acrylate, which can take into account free radical and cationic curing. The vinyl ether part can be free radical photocured or cationic photocured. Cationic photocuring is not affected by oxygen barrier and can improve the curing effect of the coating surface. At the same time, it has a post-curing effect, and it will continue to cure after leaving the light source, thereby improving the deep curing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the present invention will be described in detail below in combination with the accompanying drawings and detailed embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them: Figure 1 This is a performance test chart of the UV-curable battery insulating paint prepared in Examples 1-5 and Comparative Examples 1-3 provided by the present invention. DETAILED DESCRIPTION

[0019] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0020] Secondly, the present invention is described in detail with reference to schematic diagrams. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0021] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0022] The invention provides a UV-curable battery core insulating paint, which comprises, by mass, 20-50 parts of polyurethane acrylate, 10-30 parts of epoxy acrylate, 20 parts of self-made vinyl ether modified polyurethane acrylate, 40-80 parts of acrylate monomer, 5-10 parts of thiol, 1-5 parts of coupling agent, 3-5 parts of color paste, 5-10 parts of photoinitiator, 0.3 part of a combination of cationic photoinitiators PAG-201 and PSS-002, and 0.2-1 part of leveling agent, wherein the ratio of polyurethane acrylate to epoxy acrylate is 1:0.25-0.375, the polyurethane acrylate comprises a mixture of CR93115 and B-270, and the epoxy acrylate is L-6117.

[0023] Preferably, in the present embodiment, the self-made vinyl ether modified polyurethane acrylate comprises a polyol, an isocyanate, a hydroxy acrylate and a hydroxy vinyl ether in a molar ratio of 1.5-2: 2.5-3.5: 0.75-1.25: 1-1.5, the polyol is selected from one or more of polyester polyols, polycarbonate polyols, polyether polyols and polycaprolactone polyols, preferably polycaprolactone polyols, the diisocyanate is selected from one or more of toluene diisocyanate, isophorone diisocyanate and dicyclohexylmethane diisocyanate, preferably isophorone diisocyanate, the acrylate is selected from one or more of hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxybutyl acrylate and hydroxybutyl methacrylate, preferably hydroxyethyl acrylate, the hydroxy vinyl ether is selected from one or more of diethylene glycol monovinyl ether and 4-hydroxybutyl vinyl ether, preferably diethylene glycol monovinyl ether, and the acrylate monomer is isobornyl methacrylate (IBOMA), cyclotrimethylolpropane formal acrylate (CTF) and cyclotrimethylolpropane formal acrylate (CTF). A), one or more of tripropylene glycol diacrylate (TPGDA), trimethylolpropane triacrylate (TMPTA), acryloyl morpholine (ACMO), dipentaerythritol hexaacrylate (DPHA), more preferably a mixture of isobornyl methacrylate (IBOMA), cyclotrimethylolpropane methyl acrylate (CTFA), dipentaerythritol hexaacrylate (DPHA) in a ratio of 3:2:1, and the thiol is n-dodecyl mercaptan, tert-dodecyl mercaptan, mercaptoethanol , UV-640, UV-6643, PE1 or more, more preferably UV-640, the coupling agent is A-171, A-172, KH570, A-151 or more, more preferably KH570, the leveling agent is BYK333, BYK381, BYK361N, BYK-354, Tego-410, Tego-450 or more, more preferably Tego-410, and the photoinitiator is ITX.

[0024] In order to verify the performance and effect of a UV-curable battery core insulating paint of the present invention, the present invention provides the following Examples 1-5 and Comparative Examples 1-2. Example 1

[0025] A UV light-curable battery core insulating paint, the preparation method of which is as follows: After heating the polyol to 65°C-75°C, diisocyanate is added to react to the theoretical isocyanate value, and then hydroxy acrylate and hydroxy vinyl ether are added to block at 90-95°C to obtain a self-made vinyl ether modified polyurethane acrylate, wherein the molar ratio of the polyol: isocyanate: hydroxy acrylate: hydroxy vinyl ether is 1.8:3:1.2:1.3; A 1:1 mixture of 20 g of CR93115 and 20 g of B-270, 20 g of homemade vinyl ether modified polyurethane acrylate, 15 g of L-6117, 30 g of isobornyl methacrylate (IBOMA), 20 g of cyclotrimethylolpropane formal acrylate (CTFA) and 10 g of dipentaerythritol hexaacrylate (DPHA) in a ratio of 3:2:1, and 5 g of UV-640 were mixed and stirred at room temperature for 100 min, and then 3 g of KH570, 3 g of color paste, and 0.5 g of Tego-410 were added and stirred at high speed for 2 h. 3 g of ITX and 0.3 g of a combination of cationic photoinitiators PAG-201 and PSS-002 were added in a dark environment and stirred for 30 min to obtain a UV battery core insulating paint. Example 2

[0026] A UV light-curable battery core insulating paint, the preparation method of which is as follows: After heating the polyol to 65°C-75°C, diisocyanate is added to react to the theoretical isocyanate value, and then hydroxy acrylate and hydroxy vinyl ether are added to block at 90-95°C to obtain a self-made vinyl ether modified polyurethane acrylate, wherein the molar ratio of the polyol: isocyanate: hydroxy acrylate: hydroxy vinyl ether is 1.8:3:1.2:1.3; A 3:1 mixture of 30 g CR93115 and 10 g B-270, 20 g homemade vinyl ether modified polyurethane acrylate, 15 g L-6117, 20 g isobornyl methacrylate (IBOMA), 20 g cyclotrimethylolpropane formal acrylate (CTFA), 20 g dipentaerythritol hexaacrylate (DPHA) in a 1:1:1 mixture and 5 g UV-640 were mixed and stirred at room temperature for 100 min, and then 3 g KH570, 3 g color paste, and 0.5 g Tego-410 were added and stirred at high speed for 2 h. 3 g ITX and 0.3 g of a combination of cationic photoinitiators PAG-201 and PSS-002 were added in a dark environment and stirred for 30 min to obtain a UV battery core insulating paint. Example 3

[0027] A UV light-curable battery core insulating paint, the preparation method of which is as follows: After heating the polyol to 65°C-75°C, diisocyanate is added to react to the theoretical isocyanate value, and then hydroxy acrylate and hydroxy vinyl ether are added to block at 90-95°C to obtain a self-made vinyl ether modified polyurethane acrylate, wherein the molar ratio of the polyol: isocyanate: hydroxy acrylate: hydroxy vinyl ether is 1.8:3:1.2:1.3; A 1:1 mixture of 20 g of CR93115 and 20 g of B-270, 20 g of homemade vinyl ether modified polyurethane acrylate, 10 g of L-6117, 30 g of isobornyl methacrylate (IBOMA), 20 g of cyclotrimethylolpropane formal acrylate (CTFA) and 10 g of dipentaerythritol hexaacrylate (DPHA) in a ratio of 3:2:1, and 5 g of UV-640 were mixed and stirred at room temperature for 100 min, and then 3 g of KH570, 3 g of color paste, and 0.5 g of Tego-410 were added and stirred at high speed for 2 h. 3 g of ITX and 0.3 g of a combination of cationic photoinitiators PAG-201 and PSS-002 were added in a dark environment and stirred for 30 min to obtain a UV battery core insulating paint. Example 4

[0028] A UV light-curable battery core insulating paint, the preparation method of which is as follows: After heating the polyol to 65°C-75°C, diisocyanate is added to react to the theoretical isocyanate value, and then hydroxy acrylate and hydroxy vinyl ether are added to block at 90-95°C to obtain a self-made vinyl ether modified polyurethane acrylate, wherein the molar ratio of the polyol: isocyanate: hydroxy acrylate: hydroxy vinyl ether is 1.8:3:1.2:1.3; A 1:1 mixture of 20 g of CR93115 and 20 g of B-270, 20 g of homemade vinyl ether modified polyurethane acrylate, 15 g of L-6117, 30 g of isobornyl methacrylate (IBOMA), 20 g of cyclotrimethylolpropane formal acrylate (CTFA) and 10 g of dipentaerythritol hexaacrylate (DPHA) in a ratio of 3:2:1, and 5 g of UV-640 were mixed and stirred at room temperature for 100 min, and then 3 g of A-171, 3 g of color paste, and 0.5 g of Tego-410 were added and stirred at high speed for 2 h. 3 g of ITX and 0.3 g of a combination of cationic photoinitiators PAG-201 and PSS-002 were added in a dark environment and stirred for 30 min to obtain a UV battery core insulating paint. Example 5

[0029] A UV light-curable battery core insulating paint, the preparation method of which is as follows: After heating the polyol to 65°C-75°C, diisocyanate is added to react to the theoretical isocyanate value, and then hydroxy acrylate and hydroxy vinyl ether are added to block at 90-95°C to obtain a self-made vinyl ether modified polyurethane acrylate, wherein the molar ratio of the polyol: isocyanate: hydroxy acrylate: hydroxy vinyl ether is 1.8:3:1.2:1.3; A 1:1 mixture of 20 g of CR93115 and 20 g of B-270, 20 g of homemade vinyl ether modified polyurethane acrylate, 15 g of L-6117, 30 g of isobornyl methacrylate (IBOMA), 20 g of cyclotrimethylolpropane formal acrylate (CTFA) and 10 g of dipentaerythritol hexaacrylate (DPHA) in a ratio of 3:2:1, and 3 g of UV-640 were mixed and stirred at room temperature for 100 min, and then 3 g of KH570, 3 g of color paste, and 0.5 g of Tego-410 were added and stirred at high speed for 2 h. 3 g of ITX and 0.3 g of a combination of cationic photoinitiators PAG-201 and PSS-002 were added in a dark environment and stirred for 30 min to obtain a UV battery core insulating paint.

[0030] Comparative Example 1 A UV light-curable battery core insulating paint, the preparation method of which is as follows: After heating the polyol to 65°C-75°C, diisocyanate is added to react to the theoretical isocyanate value, and then hydroxy acrylate and hydroxy vinyl ether are added to block at 90-95°C to obtain a self-made vinyl ether modified polyurethane acrylate, wherein the molar ratio of the polyol: isocyanate: hydroxy acrylate: hydroxy vinyl ether is 1.8:3:1.2:1.3; A 1:1 mixture of 20 g of LP-030 and 20 g of B-270, 20 g of homemade vinyl ether modified polyurethane acrylate, 15 g of L-6114, 30 g of isobornyl methacrylate (IBOMA), 20 g of cyclotrimethylolpropane formal acrylate (CTFA) and 10 g of dipentaerythritol hexaacrylate (DPHA) in a ratio of 3:2:1, and 5 g of UV-640 were mixed and stirred at room temperature for 100 min, and then 3 g of KH570, 3 g of color paste, and 0.5 g of Tego-410 were added and stirred at high speed for 2 h. 3 g of ITX and 0.3 g of a combination of cationic photoinitiators PAG-201 and PSS-002 were added in a dark environment and stirred for 30 min to obtain a UV battery core insulating paint.

[0031] Comparative Example 2 A UV light-curable battery core insulating paint, the preparation method of which is as follows: After heating the polyol to 65°C-75°C, diisocyanate is added to react to the theoretical isocyanate value, and then hydroxy acrylate and hydroxy vinyl ether are added to block at 90-95°C to obtain a self-made vinyl ether modified polyurethane acrylate, wherein the molar ratio of the polyol: isocyanate: hydroxy acrylate: hydroxy vinyl ether is 1.8:3:1.2:1.3; A 1:1 mixture of 20 g of CR93013 and 20 g of B-270, 20 g of homemade vinyl ether modified polyurethane acrylate, 15 g of HE3201, 20 g of isobornyl methacrylate (IBOMA), 20 g of cyclotrimethylolpropane formal acrylate (CTFA), 20 g of a 1:1:1 mixture of dipentaerythritol hexaacrylate (DPHA), and 5 g of UV-640 were mixed and stirred at room temperature for 100 min, and then 3 g of KH570, 3 g of color paste, and 0.5 g of Tego-410 were added and stirred at high speed for 2 h. 3 g of ITX and 0.3 g of a combination of cationic photoinitiators PAG-201 and PSS-002 were added in a dark environment and stirred for 30 min to obtain a UV battery core insulating paint.

[0032] Comparative Example 3 A UV light-curable battery insulating paint, the preparation method of which is as follows: a 1:1 mixture of 20g of CR93115 and 20g of B-270, 15g of L-6117, 30g of isobornyl methacrylate (IBOMA), 20g of cyclotrimethylolpropane formal acrylate (CTFA) and 10g of dipentaerythritol hexaacrylate (DPHA) in a ratio of 3:2:1, and 5g of UV-640 are mixed, and the mixture is stirred at room temperature for 100min, and then 3g of PM-2, 3g of color paste, and 0.5g of Tego-410 are added, and the mixture is stirred at high speed for 2h, and 3g of ITX is added in a light-proof manner, and the mixture is stirred for 30min to obtain the UV battery insulating paint.

[0033] like Figure 1 It can be seen that the screening and matching of the photocurable resin of the present invention ensure flexibility and strength, and have strong resistance to electrolyte and water vapor; the selection of monomers takes into account dilution ability, chemical resistance, and supplementation of insufficient performance of the main resin; the combination of the photoinitiator system ensures efficient and rapid curing, adaptability to various light sources, and effective resistance to oxygen inhibition, and the selected resins CR93115, B-270 and L-6117 can provide good electrolyte resistance and moisture and heat resistance effects. Corresponding monomers are matched according to the performance characteristics of the main resin. CR93115 has good flexibility and fast curing speed, B-270 has low viscosity, good adhesion, and fast curing, L-6117 has good toughness, good chemical resistance, and good water resistance. CR93115 provides basic performance, B-270 adjusts viscosity within the qualified performance range, and L-6117 is used to supplement chemical resistance and water resistance. DPHA has a faster reaction speed. Increasing the dosage will reduce the curing energy, but will increase the system shrinkage and affect the bending performance and moisture and heat resistance stability.

[0034] By comparing Comparative Example 3 with Example 1, it can be seen that the homemade vinyl ether modified polyurethane acrylate can take into account both free radical and cationic curing. The vinyl ether part can be free radical photocured and cationic photocured. Cationic photocuring is not affected by oxygen barrier and can improve the curing effect of the coating surface. At the same time, it has a post-curing effect, and it will continue to cure after leaving the light source, which improves the deep curing effect.

[0035] Although the present invention has been described above with reference to the embodiments, various modifications may be made thereto and parts thereof may be replaced by equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the various features in the embodiments disclosed in the present invention may be used in combination with each other in any manner, and the fact that these combinations are not exhaustively described in this specification is only for the sake of omitting space and saving resources. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A UV-curable battery insulating paint, characterized in that: Included by mass: Polyurethane acrylate: 20-50 parts, epoxy acrylate: 10-30 parts, self-made vinyl ether modified polyurethane acrylate 20 parts, acrylate monomer: 40-80 parts, thiol: 5-10 parts, coupling agent: 1-5 parts, color paste: 3-5 parts, photoinitiator: 5-10 parts, cationic photoinitiator PAG-201 and PSS-002 composition 0.3 parts, leveling agent: 0.2-1 parts; The ratio of the polyurethane acrylate to the epoxy acrylate is 1:0.25-0.375, the polyurethane acrylate includes a mixture of CR93115 and B-270, and the epoxy acrylate is L-6117.

2. The UV-curable battery core insulating paint according to claim 1, characterized in that: The acrylate monomer is one or more of isobornyl methacrylate, cyclotrimethylolpropane formal acrylate, tripropylene glycol diacrylate, trimethylolpropane triacrylate, acryloyl morpholine, and dipentaerythritol hexaacrylate.

3. The UV-curable battery core insulating paint according to claim 1, characterized in that: The mercaptan is one or more of n-dodecyl mercaptan, tert-dodecyl mercaptan, mercaptoethanol, UV-640, UV-6643, and PE1.

4. The UV-curable battery core insulating paint according to claim 1, characterized in that: The coupling agent is one or more of A-171, A-172, KH570, and A-151.

5. The UV-curable battery core insulating paint according to claim 1, characterized in that: The leveling agent is one or more of BYK333, BYK381, BYK361N, BYK-354, Tego-410, and Tego-450.

6. The UV-curable battery core insulating paint according to claim 1, characterized in that: The photoinitiator is ITX.

7. A method for preparing a UV-curable battery core insulating varnish as claimed in claim 1, characterized in that: The specific steps are as follows: Weigh 20-50 parts of polyurethane acrylate, 10-30 parts of epoxy acrylate, 20 parts of self-made vinyl ether modified polyurethane acrylate, 40-80 parts of acrylate monomer, and 5-10 parts of mercaptan in proportion, mix and stir at room temperature for 60-120 minutes; Then add 1-5 parts of coupling agent, 3-5 parts of color paste, 0.2-1 parts of leveling agent and stir at high speed for 1-3 hours, add 5-10 parts of photoinitiator and 0.3 parts of the composition of cationic photoinitiator PAG-201 and PSS-002 in a dark environment, stir for 20-60 minutes to obtain UV battery core insulating paint.

8. The method for preparing a UV-curable battery core insulating varnish according to claim 7, characterized in that: The specific preparation steps of the self-made vinyl ether modified polyurethane acrylate are as follows: Heat the polyol to 65°C-75°C and add diisocyanate to react to the theoretical isocyanate value, then add hydroxy acrylate and hydroxy vinyl ether to cap at 90-95°C; Wherein, the molar ratio of the polyol:isocyanate:hydroxy acrylate:hydroxy vinyl ether is 1.5-2:2.5-3.5:0.75-1.25:1-1.5.

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