Compression-resistant foam tape and preparation method thereof

Abstract

The invention relates to the technical field of adhesive tapes, in particular to a compression-resistant foam adhesive tape and a preparation method thereof. The compression-resistant foam adhesive tape comprises a release film and an adhesive tape layer, wherein the adhesive tape layer comprises the following raw materials: acrylic acid, acrylic acid-2-hexyl ethyl ester, a curing agent, a molecular regulator, a photoinitiator, a coupling agent and a powder filler. The compression-resistant closed-cell foam adhesive tape is prepared through a unique formula. The adhesive tape has excellent bonding performance and rebound stability, can effectively relieve collision and friction between battery blocks, and improves the safety and reliability of a battery pack.

Description

Technical Field

[0001] The invention relates to the technical field of adhesive tapes, and in particular to a compression-resistant foam adhesive tape and a preparation method thereof. Background Art

[0002] With the improvement of global awareness of environmental protection and the rapid development of science and technology, the vigorous development of the new energy vehicle industry has promoted the continuous advancement of energy storage battery technology. Since battery packs are widely used as power sources in new energy equipment such as electric vehicles, and these battery packs are usually packaged by combining multiple battery blocks, how to effectively alleviate the collision and friction between battery blocks during the packaging process of the battery blocks has become a problem waiting to be solved. As shown in the Chinese invention patent with application number 202011098419.7, the traditional foam tape is formed by coating polyethylene emulsion, acrylic acid, polyurethane and other foaming materials on the substrate to form a foam layer. Although it can play a buffering role to a certain extent, when experiencing changes in external conditions such as compression and stretching, it often has problems such as excessive deformation and difficulty in restoring the original shape, which not only affects the overall performance of the battery pack, but also may bring safety hazards. Therefore, improving the bonding performance and rebound stability of the foam tape is of great significance to improving the safety and reliability of the battery pack. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a compression-resistant foam tape and a preparation method thereof.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a compression-resistant foam tape, including a release film and a tape layer, and the tape layer includes the following raw materials: acrylic acid, 2-hexylethyl acrylate, hydroxyethyl acrylate curing agent, molecular regulator, photoinitiator and powder filler.

[0005] Another technical solution adopted by the present invention is: the preparation method of the above-mentioned compression-resistant foam tape comprises the following steps: S1: uniformly mixing acrylic acid, 2-hexylethyl acrylate, hydroxyethyl acrylate, part of the molecular regulator and part of the photoinitiator, and then nitrogen filling and deoxygenating to obtain a prepolymer; S2: irradiating the prepolymer with UV to obtain a first solution; S3: adding the remaining raw materials to the first solution and stirring evenly to obtain a second solution; S4: degassing the second solution to obtain an acrylate polymer solution; S5: The acrylate polymer solution is sequentially sandwich-coated with a double-layer PET film and cured by UV light, and then laminated with a release film to obtain a compression-resistant foam tape.

[0006] The beneficial effect of the present invention is that the present invention prepares a compression-resistant closed-cell foam tape through a unique formula. The tape has excellent bonding performance and rebound stability, can effectively alleviate the collision and friction between battery blocks, and improve the safety and reliability of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a schematic diagram of the structure of the compression-resistant foam tape in a specific embodiment of the present invention.

[0008] Description of labels: 1. Release film; 2. Tape layer. DETAILED DESCRIPTION

[0009] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in combination with the implementation modes and the accompanying drawings.

[0010] Please refer to Figure 1 A compression-resistant foam tape comprises a release film and a tape layer, wherein the tape layer comprises the following raw materials: acrylic acid, 2-hexylethyl acrylate, hydroxyethyl acrylate, a curing agent, a molecular regulator, a photoinitiator and a powder filler.

[0011] From the above description, it can be seen that the beneficial effects of the present invention are: the compression-resistant foam tape of the present invention adds acrylic acid, 2-hexylethyl acrylate, curing agent, molecular regulator, photoinitiator, coupling agent and powder filler to the tape layer. Compared with conventional butyl acrylate, 2-hexylethyl acrylate can reduce the odor of the tape and improve the performance of the tape; hydroxyethyl acrylate and acrylic acid tools can improve the flexibility and impact resistance of the material; the curing agent can improve the rebound stability of the tape layer, the photoinitiator improves the speed and stability of the tape curing, the coupling agent can improve the adhesion and durability, and the powder filler improves the mechanical properties and thermal stability of the tape. The above components cooperate with each other to obtain a compression-resistant closed-cell foam tape with excellent bonding properties and rebound stability. When the tape is compressed to 30% of its original size, it can withstand a pressure of up to 450Kpa, and within 5 minutes after being compressed, its recovery rate can reach 85%. It has excellent stability and reliability during long-term use and is suitable for buffer packaging of battery packs.

[0012] Furthermore, the thickness of the PE film is 100-120 um, and the thickness of the tape layer is 1000-2300 um.

[0013] Furthermore, the tape layer includes the following raw materials, in parts by weight: 5 to 10 parts of acrylic acid, 40 to 60 parts of 2-hexylethyl acrylate, 6 to 10 parts of hydroxyethyl acrylate, 0.08 to 0.25 parts of curing agent, 0.03 to 0.07 parts of molecular regulator, 0.1 to 0.5 parts of photoinitiator and 6 to 10 parts of powder filler.

[0014] Furthermore, the tape layer also includes 0.1 to 1.0 parts of a coupling agent.

[0015] Furthermore, the coupling agent is a silane coupling agent.

[0016] As can be seen from the above description, the silane coupling agent can promote the adhesion between the tape and the substrate, thereby improving the bonding strength and durability.

[0017] Furthermore, the thickness of the PE film is 100-120 um, and the thickness of the tape layer is 1000-2300 um.

[0018] Furthermore, the tape layer also includes a defoamer and a color paste.

[0019] From the above description, it can be seen that the defoaming agent is used to remove bubbles formed during the production process to ensure the uniformity and appearance quality of the tape.

[0020] Furthermore, the tape layer includes 0.03-0.08 parts of defoaming agent and 0.05-0.1 parts of color paste in parts by weight.

[0021] Furthermore, the defoaming agent is polyoxyethylene ether.

[0022] Furthermore, the curing agent is 1,6-hexanediol diacrylate.

[0023] Furthermore, the molecular regulator is dodecanethiol.

[0024] From the above description, it can be seen that dodecanethiol can be used to adjust the molecular weight distribution of the polymer, thereby affecting the adhesive properties of the tape.

[0025] Furthermore, the photoinitiator is at least one of benzil and its derivatives, α-hydroxyketone derivatives, acylphosphorus oxides and anthraquinones.

[0026] From the above description, it can be seen that the photoinitiator can effectively induce a cross-linking reaction under ultraviolet irradiation, thereby improving the curing speed and stability of the adhesive tape.

[0027] Furthermore, the powder filler is a composition of fumed silica and glass microspheres.

[0028] From the above description, it can be seen that adding the composition of fumed silica and glass microspheres can improve the mechanical properties and thermal stability of the tape.

[0029] Furthermore, the mass ratio of the fumed silica to the glass microspheres in the composition of the fumed silica and the glass microspheres is 1-3:1-5.

[0030] Preferably, the mass ratio of fumed silica to glass microspheres in the composition of fumed silica and glass microspheres is 1:1, 1:2, 1:3, 1:4 or 3:5.

[0031] Another technical solution adopted by the present invention is: the preparation method of the above-mentioned compression-resistant foam tape comprises the following steps: S1: uniformly mixing acrylic acid, 2-hexylethyl acrylate, hydroxyethyl acrylate, part of the molecular regulator and part of the photoinitiator, and then nitrogen filling and deoxygenating to obtain a prepolymer; S2: irradiating the prepolymer with UV to obtain a first solution; S3: adding the remaining raw materials to the first solution and stirring evenly to obtain a second solution; S4: degassing the second solution to obtain an acrylate polymer solution; S5: The acrylate polymer solution is sequentially sandwich-coated with a double-layer PET film and cured by UV light, and then laminated with a release film to obtain a compression-resistant foam tape.

[0032] From the above description, it can be seen that the present invention adopts solvent-free polyacrylate integral molding technology to prepare compression-resistant foam tape. In the preparation process, part of the raw materials are added first, and the remaining raw materials are added after UV irradiation, which can ensure that there is no oxygen in the prepolymer and avoid oxygen affecting the viscosity of the prepolymer and product performance.

[0033] Furthermore, the mass of some molecular regulators in S1 is 1 / 10 to 3 / 10 of the mass of all molecular regulators.

[0034] Furthermore, the mass of the partial photoinitiator in S1 is 1 / 20 to 1 / 5 of the mass of the total photoinitiator.

[0035] Furthermore, the nitrogen filling and deoxygenation in S1 is specifically as follows: stirring is continued for 0.5 h under the premise of maintaining nitrogen filling.

[0036] Furthermore, the step S2 is specifically as follows: UV irradiates the prepolymer for 10 to 15 minutes to obtain a first solution.

[0037] Furthermore, the step S4 is specifically as follows: vacuum degassing the second solution while stirring until no bubbles float up to obtain an acrylate polymer solution.

[0038] Furthermore, the thickness of the PE film is 100-120 um, and the thickness of the tape layer is 1000-2300 um.

[0039] In the following examples, the black color paste is DIC UC-3128; the manufacturer of the glass microspheres is PETTER, and the model number is 7014; and the mass ratio of the fumed silica to the glass microspheres in the composition of the fumed silica and the glass microspheres is 1:2.

[0040] Please refer to Figure 1Embodiment 1 of the present invention is: a compression-resistant foam tape, comprising a laminated release film 1 with a thickness of 110 um and a tape layer 2 with a thickness of 2000 um; the tape layer is composed of the following raw materials in parts by weight: 7 kg of acrylic acid, 50 kg of 2-hexylethyl acrylate, 8 kg of hydroxyethyl acrylate, 0.2 kg of 1,6-hexanediol diacrylate, 0.05 kg of dodecanethiol, 0.3 kg of benzil, 0.5 kg of silane coupling agent, 8 kg of a combination of fumed silica and glass microbeads, 0.05 kg of polyoxyethylene ether and 0.5 kg of black color paste.

[0041] Embodiment 2 of the present invention is: a compression-resistant foam tape, comprising a laminated release film with a thickness of 100 um and a tape layer with a thickness of 1000 um; the tape layer is composed of the following raw materials, in parts by weight: 5 kg of acrylic acid, 40 kg of 2-hexylethyl acrylate, 6 kg of hydroxyethyl acrylate, 0.1 kg of 1,6-hexanediol diacrylate, 0.03 kg of dodecanethiol, 0.1 kg of α-hydroxyketone derivative, 6 kg of a composition of fumed silica and glass microbeads, 0.03 kg of polyoxyethylene ether and 0.05 kg of black color paste.

[0042] Embodiment 3 of the present invention is: a compression-resistant foam tape, comprising a laminated release film with a thickness of 120 um and a tape layer with a thickness of 300 um; the tape layer is composed of the following raw materials, in parts by weight: 10 kg of acrylic acid, 60 kg of 2-hexylethyl acrylate, 10 kg of hydroxyethyl acrylate, 0.25 kg of 1,6-hexanediol diacrylate, 0.07 kg of dodecanethiol, 0.5 kg of acylphosphine oxide, 1.0 kg of silane coupling agent, 10 kg of a combination of fumed silica and glass beads, 0.08 kg of polyoxyethylene ether and 0.1 kg of black color paste.

[0043] Embodiment 4 of the present invention is: a method for preparing a compression-resistant foam tape, the steps are as follows: S1: Add 7kg acrylic acid, 50kg 2-hexylethyl acrylate, 8kg hydroxyethyl acrylate, 0.005kg dodecanethiol and 0.1kg benzil into the reactor and stir for 3h until uniformly mixed; S2: nitrogen was charged into the reactor of S1, and stirring was continued for 0.5 h while nitrogen was charged, to obtain a prepolymer; S3: Turn on the UV lamp and keep irradiating the prepolymer with 80W light for 15 minutes to obtain the first solution; S4: Add 0.2 kg 1,6-hexanediol diacrylate, 0.045 kg dodecanethiol, 0.4 kg benzil, 1.0 kg silane coupling agent, 8 kg of a composition of fumed silica and glass microbeads, 0.03-0.08 kg polyoxyethylene ether and 0.5 kg black color paste to the first solution and stir for 4 hours until uniformly mixed to obtain a second solution; S5: Turn on the vacuum pump to perform vacuum degassing on the second solution while stirring, and maintain for 4 hours until no bubbles float up to obtain an acrylate polymer solution; S6: The acrylate polymer solution is sequentially sandwich-coated with a double-layer PET film and cured by UV light to obtain a tape layer with a thickness of 2000 um, which is then laminated with a release film with a thickness of 110 um to obtain a compression-resistant foam tape.

[0044] Comparative Example 1 of the present invention is: The only difference between Comparative Example 1 and Example 1 is that no photoinitiator is added and there is no S3 step.

[0045] Comparative Example 2 of the present invention is: The only difference between Comparative Example 2 and Example 1 is that no silane coupling agent is added.

[0046] Comparative Example 3 of the present invention is: The difference between Comparative Example 3 and Example 1 is that: S1: 7 kg of acrylic acid, 85 kg of 2-hexylethyl acrylate, 0.2 kg of 1,6-hexanediol diacrylate, 0.03-0.07 kg of dodecanethiol, 0.1-0.5 kg of benzil, 0.1 kg of silane coupling agent, 8 kg of a composition of fumed silica and glass microbeads, 0.05 kg of polyoxyethylene ether and 0.5 kg of black color paste were added to the reactor and stirred for 3 h until uniformly mixed; S2: nitrogen was charged into the reactor of S1, and stirring was continued for 0.5 h while nitrogen was charged, to obtain a prepolymer; S3: Turn on the UV lamp and keep irradiating the prepolymer with 80W light for 15 minutes to obtain the first solution; S4: Turn on the vacuum pump to perform vacuum degassing on the first solution while stirring, and maintain for 4 hours until no bubbles float up to obtain an acrylate polymer solution.

[0047] The adhesive properties and rebound stability of the foam tapes prepared in Example 4 and Comparative Examples 1 to 3 were tested, and the test results are shown in Table 1. The adhesive properties were tested using the test method for peel strength of adhesive tapes in GBT 2792-2014, and the compression method was tested using the test method in Sections 16-22 of ASTM D1056-20.

[0048] Table 1

[0049] Embodiment 5 of the present invention is: a method for preparing a compression-resistant foam tape, the steps are as follows: S1: Add 10 kg acrylic acid, 60 kg 2-hexylethyl acrylate, 10 kg hydroxyethyl acrylate, 0.021 kg dodecanethiol and 0.144 benzil to the reactor and stir for 3.5 hours until uniformly mixed; S2: nitrogen was charged into the reactor of S1, and stirring was continued for 0.5 h while nitrogen was charged, to obtain a prepolymer; S3: Turn on UV light, etc., keep 80W light irradiating the prepolymer for 10 minutes to obtain the first solution; S4: Add 0.2 kg 1,6-hexanediol diacrylate, 0.049 kg dodecanethiol, 0.336 kg benzil, 0.5 kg silane coupling agent, 8 kg of a composition of fumed silica and glass microbeads, 0.05 kg polyoxyethylene ether and 0.5 kg black color paste to the first solution and stir for 4.5 hours until uniformly mixed to obtain a second solution; S5: Turn on the vacuum pump to perform vacuum degassing on the second solution while stirring, and maintain for 4.5 hours until no bubbles float up, to obtain an acrylate polymer solution; S6: The acrylate polymer solution is sequentially sandwich coated with a double-layer PET film and cured by UV light to obtain a tape layer with a thickness of 2000 um, and then laminated with a release film with a thickness of 110 um to obtain a compression-resistant foam tape.

[0050] In summary, the compression-resistant foam tape and preparation method thereof provided by the present invention develop a closed-cell foam tape with high compression resistance and excellent rebound stability through a unique formula and preparation process. The tape can not only effectively alleviate the collision and friction between battery blocks, but also maintain stable bonding performance and rebound performance during long-term use, thereby significantly improving the safety and reliability of the battery pack.

[0051] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A compression-resistant foam tape, characterized in that: The invention comprises a release film and an adhesive tape layer, wherein the adhesive tape layer comprises the following raw materials: acrylic acid, 2-hexylethyl acrylate, hydroxyethyl acrylate, a curing agent, a molecular regulator, a photoinitiator and a powder filler.

2. The compression-resistant foam tape according to claim 1, characterized in that: The tape layer comprises the following raw materials in parts by weight: 5 to 10 parts of acrylic acid, 40 to 60 parts of 2-hexylethyl acrylate, 6 to 10 parts of hydroxyethyl acrylate, 0.08 to 0.25 parts of curing agent, 0.03 to 0.07 parts of molecular regulator, 0.1 to 0.5 parts of photoinitiator and 6 to 10 parts of powder filler.

3. The compression-resistant foam tape according to claim 1, characterized in that: The adhesive tape layer also includes a coupling agent.

4. The compression-resistant foam tape according to claim 1, characterized in that: The curing agent is 1,6-hexanediol diacrylate.

5. The compression-resistant foam tape according to claim 1, characterized in that: The molecular regulator is dodecanethiol.

6. The compression-resistant foam tape according to claim 1, characterized in that: The photoinitiator is at least one of benzil and its derivatives, α-hydroxyketone derivatives, acylphosphorus oxides and anthraquinones.

7. The compression-resistant foam tape according to claim 1, characterized in that: The powder filler is a composition of fumed silica and glass microspheres.

8. The method for preparing the compression-resistant foam tape according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1: uniformly mixing acrylic acid, 2-hexylethyl acrylate, hydroxyethyl acrylate, part of the molecular regulator and part of the photoinitiator, and then nitrogen filling and deoxygenating to obtain a prepolymer; S2: irradiating the prepolymer with UV to obtain a first solution; S3: adding the remaining raw materials to the first solution and stirring evenly to obtain a second solution; S4: degassing the second solution to obtain an acrylate polymer solution; S5: The acrylate polymer solution is sequentially sandwich-coated with a double-layer PET film and cured by UV light, and then laminated with a release film to obtain a compression-resistant foam tape.

9. The method for preparing the compression-resistant foam tape according to claim 8, characterized in that: The step S2 is specifically as follows: UV irradiates the prepolymer for 10 to 15 minutes to obtain a first solution.

10. The method for preparing the compression-resistant foam tape according to claim 8, characterized in that: The step S4 is specifically as follows: vacuum degassing the second solution while stirring until no bubbles float up to obtain an acrylate polymer solution.

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