Waterproof adhesive tape for electronic products and preparation method of waterproof adhesive tape

Abstract

The invention relates to a waterproof adhesive tape for electronic products and a preparation method thereof, and belongs to the technical field of adhesive tapes. The waterproof adhesive tape sequentially comprises a release film, an adhesive layer, a gradient aperture foam composite layer, a bottom coating layer, a base material, a bottom coating layer, a gradient aperture foam composite layer, an adhesive layer and a release film from the upper layer to the lower layer, the gradient aperture foam composite layer is composed of the buffer layer, the transition layer and the group water layer and has uniform waterproofness, the unicity of material waterproofness is optimized structurally, in addition, modified nano silicon dioxide is introduced into the adhesive layer, so that the adhesive tape has super-hydrophobic performance, the adhesive tape is endowed with an excellent waterproof function, and the waterproof performance of the adhesive tape is improved. The prepared adhesive tape is suitable for waterproof sealing of electronic products such as smart phones and new energy automobile battery modules.

Description

Technical Field

[0001] The invention belongs to the technical field of adhesive tapes and relates to a waterproof adhesive tape for electronic products and a preparation method thereof. Background Art

[0002] Electronic products are related products that use electricity as the basis for their work, mainly including: watches, smart phones, etc. Because early products mainly used vacuum tubes as basic components, they are called electronic products.

[0003] In addition to providing a secure bond, border tape also needs to perform other functional functions. First, vertical light blocking is essential to prevent light leakage from the screen, with black being the optimal color. Second, cushioning is essential to mitigate damage to electronic products caused by drops or placement. To achieve higher product quality and customer satisfaction, waterproofing is a key requirement for electronic products, primarily to prevent prolonged exposure to high humidity and even short periods of submersion in water. Summary of the Invention

[0004] The present invention relates to a waterproof tape for electronic products and a preparation method thereof, belonging to the technical field of tapes. The waterproof tape disclosed in the present invention comprises, from the upper layer to the lower layer, a release film-adhesive layer-gradient aperture foam composite layer-primer coating-base material-primer coating-gradient aperture foam composite layer-adhesive layer-release film; the gradient aperture foam composite layer introduced in the present invention is composed of a buffer layer, a transition layer and a water-forming layer, which has uniform waterproof properties, and optimizes the singleness of waterproofing by relying on materials from a structural perspective. In addition, the adhesive layer has super-hydrophobic properties by introducing modified nano-silica, which gives the tape excellent waterproof function. The tape prepared by the present invention is suitable for waterproof sealing of electronic products such as smart phones and new energy vehicle battery modules.

[0005] The purpose of the present invention can be achieved through the following technical solutions: A waterproof tape for electronic products, the structure of the waterproof tape for electronic products comprising, from upper layer to lower layer, a release film - an adhesive layer - a gradient pore size foam composite layer - a primer layer - a substrate - a primer layer - a gradient pore size foam composite layer - an adhesive layer - a release film.

[0006] Furthermore, the adhesive layer is composed of acrylic glue, modified nano-silica and epoxy curing agent in a mass ratio of 100-120:5-10:0.1-0.3, wherein the preparation method of the modified nano-silica is: under the condition of passing nitrogen, perfluorosilane and γ-aminopropyltriethoxysilane are added together to anhydrous ethanol and stirred for 2-3 hours, and then the anhydrous ethanol is removed by reduced pressure distillation to obtain material a, nano-silica, ethanol and deionized water are mixed, and then material a is added and mixed and stirred, filtered, and the solid is dried to obtain modified silica.

[0007] Furthermore, the mass ratio of the perfluorosilane, γ-aminopropyltriethoxysilane and anhydrous ethanol is 1:0.8-1:2, wherein the perfluorosilane is perfluorodecyltriethoxysilane, the pressure and time of the reduced pressure distillation are -0.08 MPa and 15-30 min, respectively, the mass ratio of the nano-silica, ethanol, deionized water and material a is 1-2:30:20-30:0.5-0.6, wherein the mass fraction of ethanol is 75%, the mixing and stirring time is 3-5 h, and the drying temperature is 50-70 ° C.

[0008] Furthermore, the preparation method of the gradient pore size foam composite layer is: (1) SBS, thermoplastic polyurethane rubber and foamed microspheres are compounded into material A in a mass ratio of 1-2:1:0.02-0.03 and set aside; (2) Thermoplastic polyurethane rubber and silicon carbide fiber are compounded into material B in a mass ratio of 100:3-5 and set aside; (3) Thermoplastic polyurethane rubber and hydrophobic nano-silica are compounded into material C in a mass ratio of 100:10-12, and set aside; (4) Material A, material B and material C are respectively put into a three-channel extruder for extrusion.

[0009] Furthermore, in step (4), the mass ratio of material A, material B and material C is 1:0.5-0.8:1.5, the foaming temperatures of material A, material B and material C are 160-165°C, 140-145°C and 100-110°C respectively, and the extrusion temperature is 160-180°C.

[0010] Furthermore, the method for preparing the waterproof tape for electronic products comprises the following steps: A1: Apply primer on both sides of the substrate, then cover the gradient pore size foam composite layer on both sides of the primer with material A facing downwards; A2: The adhesive is applied to a release film and then transferred to the gradient pore size foam composite layer. After curing, a waterproof tape for electronic products is obtained.

[0011] Furthermore, the substrate in step A1 is PET with a thickness of 12-20 μm, the thickness of the primer layer is 4-6 μm, and the thickness of the gradient pore size foam composite layer is 30-35 μm.

[0012] Furthermore, the adhesive coating thickness in step A2 is 30-33 μm, and the aging temperature and time are 50-65° C. and 2-3 days, respectively.

[0013] Beneficial effects of the present invention: The gradient pore size foam composite layer introduced in the present invention consists of a buffer layer, a transition layer and a water-organizing layer. It has uniform waterproof properties and optimizes the singleness of waterproofing relying on materials from a structural perspective. In addition, the adhesive layer has super-hydrophobic properties by introducing modified nano-silica, which gives the tape excellent waterproof function. The tape prepared by the present invention is suitable for waterproof sealing of electronic products such as smart phones and new energy vehicle battery modules. DETAILED DESCRIPTION

[0014] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation methods, structures, features and effects of the present invention are described in detail below in combination with the embodiments.

[0015] The acrylic glue involved in the present invention was purchased from Shanghai Youen Chemical Co., Ltd., model SAC-100; the epoxy curing agent was purchased from Jinan Zesheng Chemical Co., Ltd., and perfluorodecyltriethoxysilane was purchased from Qufu Yishun Chemical Co., Ltd.; SBS was purchased from Dongguan Yingxiang Plastic Raw Materials Co., Ltd., brand F875; thermoplastic polyurethane rubber was purchased from Dongguan Yingxiang Plastic Raw Materials Co., Ltd., brand 2280A, and foamed microspheres were purchased from Changzhou Rongren Trading Co., Ltd., with a particle size of 15-25 μm; silicon carbide fiber was purchased from Qinghe Chaotai Metal Materials Co., Ltd., CAS number 1344-2-2; hydrophobic nano-silica was purchased from Shouguang Changtai New Materials Co., Ltd., CAS number 10; styrene copolymer was purchased from Hebei Wenchang Energy Saving Technology Co., Ltd.; maleic anhydride modified rosin resin was purchased from Dongguan Zhangmutou Hongji Plastics Trading Co., Ltd. Example 1

[0016] A waterproof tape for electronic products, the structure of the waterproof tape for electronic products comprising, from upper layer to lower layer, a release film - an adhesive layer - a gradient pore size foam composite layer - a primer layer - a substrate - a primer layer - a gradient pore size foam composite layer - an adhesive layer - a release film.

[0017] The adhesive layer is composed of acrylic glue, modified nano-silica and epoxy curing agent in a mass ratio of 100:5:0.1. The preparation method of the modified nano-silica is as follows: under the condition of nitrogen, perfluorosilane and γ-aminopropyltriethoxysilane are added together to anhydrous ethanol and stirred for 2 hours, then the anhydrous ethanol is removed by reduced pressure distillation to obtain material a, nano-silica, ethanol and deionized water are mixed, and then material a is added to the mixture and mixed and stirred, filtered, and the solid is dried to obtain the modified silica.

[0018] The mass ratio of the perfluorosilane, γ-aminopropyltriethoxysilane and anhydrous ethanol is 1:0.8:2, wherein the perfluorosilane is perfluorodecyltriethoxysilane, the pressure and time of the reduced pressure distillation are -0.08 MPa and 15 min, respectively, the mass ratio of the nano-silica, ethanol, deionized water and material a is 1:30:20:0.5, wherein the mass fraction of ethanol is 75%, the mixing and stirring time is 3 h, and the drying temperature is 50°C.

[0019] The preparation method of the gradient pore size foam composite layer is as follows: (1) SBS, thermoplastic polyurethane rubber and foamed microspheres are compounded into material A in a mass ratio of 1:1:0.02 and set aside; (2) Thermoplastic polyurethane rubber and silicon carbide fiber are compounded into material B in a mass ratio of 100:3 and set aside; (3) Thermoplastic polyurethane rubber and hydrophobic nano-silica are compounded into material C in a mass ratio of 100:10 and set aside; (4) Material A, material B and material C are respectively put into a three-channel extruder for extrusion.

[0020] In the step (4), the mass ratio of material A, material B and material C is 1:0.5:1.5, the foaming temperatures of material A, material B and material C are 160°C, 140°C and 100°C respectively, and the extrusion temperature is 160°C.

[0021] The preparation method of the waterproof tape for electronic products comprises the following steps: A1: Apply primer on both sides of the substrate, then cover the gradient pore size foam composite layer on both sides of the primer with material A facing downwards; A2: The adhesive is applied to a release film and then transferred to the gradient pore size foam composite layer. After curing, a waterproof tape for electronic products is obtained.

[0022] The substrate in step A1 is PET with a thickness of 12 μm, the thickness of the primer layer is 4 μm, and the thickness of the gradient pore size foam composite layer is 30 μm.

[0023] The thickness of the adhesive coating in step A2 is 30 μm, and the aging temperature and time are 50° C. and 2 days, respectively.

[0024] The preparation method of the primer liquid is as follows: styrene copolymer and toluene are mixed in a mass ratio of 1:6 to form a mixed liquid a, maleic anhydride-modified rosin resin and toluene are mixed in a mass ratio of 1:3 to form a mixed liquid b, the two solutions are mixed in a volume ratio of 2:1, and mixed uniformly using a high-speed disperser to obtain the primer liquid. Example 2

[0025] A waterproof tape for electronic products, the structure of the waterproof tape for electronic products comprising, from upper layer to lower layer, a release film - an adhesive layer - a gradient pore size foam composite layer - a primer layer - a substrate - a primer layer - a gradient pore size foam composite layer - an adhesive layer - a release film.

[0026] The adhesive layer is composed of acrylic glue, modified nano-silica and epoxy curing agent in a mass ratio of 110:8:0.2. The preparation method of the modified nano-silica is as follows: under the condition of nitrogen, perfluorosilane and γ-aminopropyltriethoxysilane are added together to anhydrous ethanol and stirred for 2.5 hours, then the anhydrous ethanol is removed by reduced pressure distillation to obtain material a, nano-silica, ethanol and deionized water are mixed, and then material a is added to the mixture and mixed and stirred, filtered, and the solid is dried to obtain the modified silica.

[0027] The mass ratio of the perfluorosilane, γ-aminopropyltriethoxysilane and anhydrous ethanol is 1:0.9:2, wherein the perfluorosilane is perfluorodecyltriethoxysilane, the pressure and time of the reduced pressure distillation are -0.08 MPa and 20 min, respectively, the mass ratio of the nano-silica, ethanol, deionized water and material a is 1.5:30:25:0.55, wherein the mass fraction of ethanol is 75%, the mixing and stirring time is 4 h, and the drying temperature is 60°C.

[0028] The preparation method of the gradient pore size foam composite layer is as follows: (1) SBS, thermoplastic polyurethane rubber and foamed microspheres are compounded into material A in a mass ratio of 1.5:1:0.025 and set aside; (2) Thermoplastic polyurethane rubber and silicon carbide fiber are compounded into material B in a mass ratio of 100:4 and set aside; (3) Thermoplastic polyurethane rubber and hydrophobic nano-silica are compounded into material C in a mass ratio of 100:11 and set aside; (4) Material A, material B and material C are respectively put into a three-channel extruder for extrusion.

[0029] In the step (4), the mass ratio of material A, material B and material C is 1:0.6:1.5, the foaming temperatures of material A, material B and material C are 163°C, 142°C and 105°C respectively, and the extrusion temperature is 170°C.

[0030] The preparation method of the waterproof tape for electronic products comprises the following steps: A1: Apply primer on both sides of the substrate, then cover the gradient pore size foam composite layer on both sides of the primer with material A facing downwards; A2: The adhesive is applied to a release film and then transferred to the gradient pore size foam composite layer. After curing, a waterproof tape for electronic products is obtained.

[0031] The substrate in step A1 is PET with a thickness of 18 μm, the thickness of the primer layer is 5 μm, and the thickness of the gradient pore size foam composite layer is 33 μm.

[0032] The thickness of the adhesive coating in step A2 is 31 μm, and the aging temperature and time are 58° C. and 2.5 days, respectively.

[0033] The preparation method of the primer liquid is as follows: styrene copolymer and toluene are mixed in a mass ratio of 1:6 to form a mixed liquid a, maleic anhydride-modified rosin resin and toluene are mixed in a mass ratio of 1:3 to form a mixed liquid b, the two solutions are mixed in a volume ratio of 2:1, and mixed uniformly using a high-speed disperser to obtain the primer liquid. Example 3

[0034] A waterproof tape for electronic products, the structure of the waterproof tape for electronic products comprising, from upper layer to lower layer, a release film - an adhesive layer - a gradient pore size foam composite layer - a primer layer - a substrate - a primer layer - a gradient pore size foam composite layer - an adhesive layer - a release film.

[0035] The adhesive layer is composed of acrylic glue, modified nano-silica and epoxy curing agent in a mass ratio of 120:10:0.3. The preparation method of the modified nano-silica is as follows: under the condition of nitrogen, perfluorosilane and γ-aminopropyltriethoxysilane are added together to anhydrous ethanol and stirred for 3 hours, then the anhydrous ethanol is removed by reduced pressure distillation to obtain material a, nano-silica, ethanol and deionized water are mixed, and then material a is added to the mixture and mixed and stirred, filtered, and the solid is dried to obtain the modified silica.

[0036] The mass ratio of the perfluorosilane, γ-aminopropyltriethoxysilane and anhydrous ethanol is 1:1:2, wherein the perfluorosilane is perfluorodecyltriethoxysilane, the pressure and time of the reduced pressure distillation are -0.08 MPa and 30 min, respectively, the mass ratio of the nano-silica, ethanol, deionized water and material a is 2:30:30:0.6, wherein the mass fraction of ethanol is 75%, the mixing and stirring time is 5 h, and the drying temperature is 70°C.

[0037] The preparation method of the gradient pore size foam composite layer is as follows: (1) SBS, thermoplastic polyurethane rubber and foamed microspheres are compounded into material A in a mass ratio of 2:1:0.03 and set aside; (2) Thermoplastic polyurethane rubber and silicon carbide fiber are compounded into material B in a mass ratio of 100:5 and set aside; (3) Thermoplastic polyurethane rubber and hydrophobic nano-silica are compounded into material C in a mass ratio of 100:12 and set aside; (4) Material A, material B and material C are respectively put into a three-channel extruder for extrusion.

[0038] In the step (4), the mass ratio of material A, material B and material C is 1:0.8:1.5, the foaming temperatures of material A, material B and material C are 165°C, 145°C and 110°C respectively, and the extrusion temperature is 180°C.

[0039] The preparation method of the waterproof tape for electronic products comprises the following steps: A1: Apply primer on both sides of the substrate, then cover the gradient pore size foam composite layer on both sides of the primer with material A facing downwards; A2: The adhesive is applied to a release film and then transferred to the gradient pore size foam composite layer. After curing, a waterproof tape for electronic products is obtained.

[0040] The substrate in step A1 is PET with a thickness of 20 μm, the thickness of the primer layer is 6 μm, and the thickness of the gradient pore size foam composite layer is 35 μm.

[0041] The thickness of the adhesive coating in step A2 is 33 μm, and the aging temperature and time are 65° C. and 3 days, respectively.

[0042] The preparation method of the primer liquid is as follows: styrene copolymer and toluene are mixed in a mass ratio of 1:6 to form a mixed liquid a, maleic anhydride-modified rosin resin and toluene are mixed in a mass ratio of 1:3 to form a mixed liquid b, the two solutions are mixed in a volume ratio of 2:1, and mixed uniformly using a high-speed disperser to obtain the primer liquid.

[0043] Comparative Example 1 On the basis of Example 2, step (2) in the preparation process of the gradient pore size instant noodle composite layer was removed, and the material B was replaced by the material C of the same mass. The other conditions were the same as those in Example 2.

[0044] Comparative Example 2 On the basis of Example 2, step (3) in the preparation process of the gradient pore size instant noodle composite layer was removed, and the material C was replaced by material C of equal mass. Other conditions were consistent with Example 2.

[0045] Comparative Example 3 On the basis of Example 2, the gradient pore size foam was removed and replaced with polyurethane foam of equal mass. Other conditions were the same as those in Example 2.

[0046] Comparative Example 4 On the basis of Example 2, the perfluorodecyltriethoxysilane in the process of modifying silica was removed and replaced with an equal mass of heptadecafluorodecyltriethoxysilane, and the other conditions were the same as those in Example 2.

[0047] Performance Testing The waterproof tapes for electronic products prepared in Examples 1-3 and Comparative Examples 1-4 were used as samples. The peel strength and static shear strength of the samples were tested according to ASTM D3330 and FINAT 8, and the waterproof grade of the samples was determined according to IEC 60529. The results are shown in Table 1.

[0048] Table 1 Test results Analysis of the results in Table 1 reveals that Examples 1-3 and 4 have similar mechanical properties, exhibiting excellent mechanical properties. However, the waterproofing properties of Comparative Examples 1-4 are inferior to those of Examples 1-3. In Comparative Examples 1-3, removing the buffer layer or water-blocking layer or replacing it with a polyurethane sponge results in a larger pore size gradient and a decrease in mechanical properties. Furthermore, the increased pore size decreases the interception of water molecules, further impairing the waterproofing effect. Polyurethane sponges do not exhibit high waterproofing properties. Comparative Example 4 uses silica modified with heptadecafluorodecyltriethoxysilane, resulting in a reduced hydrophobic effect.

[0049] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, make some changes or modifications to equivalent embodiments using the technical contents disclosed above. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A waterproof tape for electronic products, characterized in that: The structure of the waterproof tape for electronic products includes, from the upper layer to the lower layer, a release film, an adhesive layer, a gradient pore foam composite layer, a primer layer, a substrate, a primer layer, a gradient pore foam composite layer, an adhesive layer, and a release film.

2. The waterproof tape for electronic products according to claim 1, characterized in that: The adhesive layer is composed of acrylic glue, modified nano-silica and epoxy curing agent in a mass ratio of 100-120:5-10:0.1-0.

3. The preparation method of the modified nano-silica is as follows: under the condition of nitrogen, perfluorosilane and γ-aminopropyltriethoxysilane are added together to anhydrous ethanol and stirred for 2-3 hours, then the anhydrous ethanol is removed by reduced pressure distillation to obtain material a, nano-silica, ethanol and deionized water are mixed, and then material a is added to the mixture and mixed and stirred, filtered, and the solid is dried to obtain the modified silica.

3. The waterproof tape for electronic products according to claim 2, characterized in that: The mass ratio of the perfluorosilane, γ-aminopropyltriethoxysilane and anhydrous ethanol is 1:0.8-1:2, wherein the perfluorosilane is perfluorodecyltriethoxysilane, the pressure and time of the reduced pressure distillation are -0.08 MPa and 15-30 min, respectively, the mass ratio of the nano-silica, ethanol, deionized water and material a is 1-2:30:20-30:0.5-0.6, wherein the mass fraction of ethanol is 75%, the mixing and stirring time is 3-5 h, and the drying temperature is 50-70 ° C.

4. The waterproof tape for electronic products according to claim 1, characterized in that: The preparation method of the gradient pore size foam composite layer is as follows: (1) SBS, thermoplastic polyurethane rubber and foamed microspheres are compounded into material A in a mass ratio of 1-2:1:0.02-0.03 and set aside; (2) Thermoplastic polyurethane rubber and silicon carbide fiber are compounded into material B in a mass ratio of 100:3-5 and set aside; (3) Thermoplastic polyurethane rubber and hydrophobic nano-silica are compounded into material C in a mass ratio of 100:10-12, and set aside; (4) Material A, material B and material C are respectively put into a three-channel extruder for extrusion.

5. The waterproof tape for electronic products according to claim 4, characterized in that: In the step (4), the mass ratio of material A, material B and material C is 1:0.5-0.8:1.5, the foaming temperatures of material A, material B and material C are 160-165°C, 140-145°C and 100-110°C respectively, and the extrusion temperature is 160-180°C.

6. The waterproof tape for electronic products according to claim 1, characterized in that: The preparation method of the waterproof tape for electronic products comprises the following steps: A1: Apply primer on both sides of the substrate, then cover the gradient pore size foam composite layer on both sides of the primer with material A facing downwards; A2: The adhesive is applied to a release film and then transferred to the gradient pore size foam composite layer. After curing, a waterproof tape for electronic products is obtained.

7. The waterproof tape for electronic products according to claim 6, characterized in that: The substrate in step A1 is PET with a thickness of 12-20 μm, the thickness of the primer layer is 4-6 μm, and the thickness of the gradient pore size foam composite layer is 30-35 μm.

8. The waterproof tape for electronic products according to claim 6, characterized in that: The thickness of the adhesive coating in step A2 is 30-33 μm, and the aging temperature and time are 50-65° C. and 2-3 days, respectively.

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