High-performance acrylic foam tape and preparation method thereof

Abstract

The invention discloses a high-performance acrylic foam tape and a preparation method thereof. The foam tape comprises a base material layer, a first release film layer, a first adhesive layer, a buffer layer, a base material layer, a second adhesive layer and a second release film layer, the performance of the acrylic foam tape is controlled through regulation and stable synthesis of the acrylic resin, and excellent impact resistance, falling resistance, rebound resistance and easy removal of the tape can be met at the same time; the buffer layer prepared by adding the foaming microspheres into the glue is used for replacing traditional foam, so that the cost is reduced, the adaptability of the glue layer to the buffer layer is improved, and meanwhile, the die cutting performance is also improved; according to the invention, the tackifying resin is used after being pretreated by a special method, so that the performance of the prepared adhesive tape can be improved.

Description

Technical Field

[0001] The invention relates to the field of foam adhesive materials, and in particular to a high-performance acrylic foam tape and a preparation method thereof. Background Art

[0002] With the update and iteration of global communication technology, mobile phones have become an important tool for the development of human communication tools. Various smart phone component materials are also constantly developing. The bonding performance of internal and external structural components directly determines the service life of the product, which puts higher requirements on the bonding solutions of various components in smart phones. Mobile phone manufacturers must also keep up with the mobile phone design cycle and design high-performance adhesives that meet or even exceed customer expectations to meet the needs. PET reinforced acrylic foam tape came into being. With its excellent impact resistance, drop resistance, rebound resistance and easy removal, it can be widely used in mobile phone front and back covers, mobile phone cameras and other components. In addition, the use of PET reinforced tape is more conducive to die cutting.

[0003] The internal stress and deformation caused by the process of the mobile phone have a great influence on the bonding of the front and rear covers or the camera. If the internal stress is large and the deformation is large, there are high requirements for the anti-warping performance of the tape. In addition, the front and rear covers and the camera of the mobile phone are in direct contact with the outside world and are easily affected by various external forces, so the adhesive used for bonding is required to be high. Some acrylic foam tapes currently on the market generally have good adhesion, but poor anti-warping performance, or good warping performance does not take into account the performance of impact resistance and drop resistance. Therefore, it is an urgent problem to develop a high-performance acrylic foam tape that has excellent impact resistance, drop resistance, warping resistance, high viscosity and easy removability. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a high-performance acrylic foam tape and a preparation method thereof in view of the deficiencies in the above-mentioned prior art.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows: In a first aspect of the present invention, a high-performance acrylic foam tape is provided, comprising a substrate layer, a first release film layer, a first adhesive layer, a buffer layer, a substrate layer, a second adhesive layer and a second release film layer stacked in sequence;

[0006] The buffer layer is obtained by coating a buffer glue composition on the surface of the substrate layer and then curing the composition. The buffer glue composition includes the following raw material components in parts by weight:

[0007] 80-120 parts of acrylic glue, 21-60 parts of tackifying resin, 0.5-3.5 parts of curing agent, and 0.7-1.4 parts of foamed microspheres.

[0008] Preferably, the raw materials for preparing the acrylic glue include the following components by weight:

[0009] 30-65 parts of butyl acrylate, 20-50 parts of isooctyl acrylate, 10-20 parts of cyclohexyl acrylate, 5-10 parts of isobornyl acrylate, 3-5 parts of acrylic acid, 0.1-1 parts of hydroxyethyl acrylate, 0.1-0.5 parts of initiator, and 80-120 parts of solvent.

[0010] Preferably, the initiator is a mixture of initiator AIBN and initiator HTP-65W.

[0011] Preferably, the acrylic glue is prepared by the following method:

[0012] Butyl acrylate, isooctyl acrylate, cyclohexyl acrylate, isobornyl acrylate, acrylic acid and hydroxyethyl acrylate are uniformly mixed to obtain a monomer mixture, part of the monomer mixture and solvent are added to a reaction container, the temperature is raised to 35-45°C, nitrogen is passed for 15-60 minutes, and then the temperature is raised to 60-65°C, nitrogen is passed, initiator AIBN is added, and the reaction is performed for 0.5-3 hours, and then the remaining monomer mixture is added dropwise for 0.5-3 hours. After the addition is completed, the reaction is continued for 15-60 minutes, the temperature is raised to 68-72°C, initiator HTP-65W is added, and the reaction is continued at this temperature for 2-8 hours to obtain acrylate glue.

[0013] Preferably, the acrylic glue is prepared by the following method:

[0014] Butyl acrylate, isooctyl acrylate, cyclohexyl acrylate, isobornyl acrylate, acrylic acid and hydroxyethyl acrylate are mixed evenly to obtain a monomer mixture, part of the monomer mixture and solvent are added to a reaction vessel, the temperature is raised to 40°C, nitrogen is passed for 30 minutes, then the temperature is raised to 63°C, nitrogen is kept passing, initiator AIBN is added, and the remaining monomer mixture is added dropwise after reacting for 1.5 hours, the dropping time is 1.5 hours, and the reaction is continued for 0.5 hours after the dropping is completed. The temperature is raised to 70°C, initiator HTP-65W is added, and the reaction is continued at this temperature for 4 hours to obtain acrylate glue.

[0015] Preferably, the tackifying resin is selected from a mixture of tackifying resin AS-5100F, tackifying resin TP-2040, and tackifying resin AS-2125D.

[0016] Preferably, the first adhesive layer and the second adhesive layer are obtained by coating an acrylic adhesive composition and then curing it. The raw materials for preparing the acrylic adhesive composition include the following components by weight: 80-120 parts of acrylic glue, 21-60 parts of tackifying resin, and 0.5-3.5 parts of curing agent.

[0017] A second aspect of the present invention provides a method for preparing the high-performance acrylic foam tape as described above, comprising the following steps:

[0018] S1, weighing a tackifying resin in advance and pre-treating it, and then uniformly mixing the pre-treated tackifying resin with acrylate glue, a curing agent, and foaming microspheres to obtain a buffering glue composition;

[0019] S2, uniformly coating the buffer glue composition on the first surface of the substrate layer, drying and curing to form a buffer layer, and obtaining a semi-finished product;

[0020] S3, mixing the pretreated tackifying resin with the acrylic glue and the curing agent to obtain an acrylic glue composition;

[0021] S4, taking a portion of the acrylic ester adhesive composition and evenly coating it on the first release film layer, drying and curing it to form a first adhesive layer, and then laminating the first adhesive layer to the buffer layer of the semi-finished product;

[0022] The remaining part of the acrylic ester adhesive composition is evenly coated on the second surface of the substrate layer, dried and solidified to form a second adhesive layer, and a second release film layer is attached to the second adhesive layer to obtain the high-performance acrylic foam tape.

[0023] Preferably, the pretreatment method of the tackifying resin is:

[0024] Add the tackifying resin into a hydrochloric acid solution with a concentration of 3-5wt% and soak for 2-4 hours, then rinse with a hydrochloric acid solution of the same concentration, the ratio of the volume of the hydrochloric acid solution used for elution to the mass of the tackifying resin is 5-7mL / g, and then rinse with deionized water until the pH of the water is neutral;

[0025] The tackifying resin is then added to a sodium hydroxide solution with a concentration of 2-10wt% and soaked for 2-4 hours, then rinsed with a sodium hydroxide solution of the same concentration, the ratio of the volume of the sodium hydroxide solution used for elution to the mass of the tackifying resin being 5-7mL / g, then rinsed with deionized water until the pH of the effluent is neutral, and dried to complete the pretreatment of the tackifying resin.

[0026] Preferably, the method for preparing the high-performance acrylic foam tape comprises the following steps:

[0027] S1, weighing a tackifying resin in advance and pre-treating it, and then uniformly mixing the pre-treated tackifying resin with acrylate glue, a curing agent, and foaming microspheres to obtain a buffering glue composition;

[0028] S2, uniformly coating the buffer glue composition on the first surface of the 25 μm black PET substrate layer, drying at 120° C. for 5 min to solidify to form a buffer layer with a thickness of 95 μm, to obtain a semi-finished product;

[0029] S3, mixing the pretreated tackifying resin with the acrylic glue and the curing agent to obtain an acrylic glue composition;

[0030] S4, evenly coating a portion of the acrylic ester adhesive composition on a first release film layer with a thickness of 50 μm, drying at 120° C. for 5 min to solidify to form a first adhesive layer with a thickness of 90 μm, and then laminating the first adhesive layer to the buffer layer of the semi-finished product;

[0031] The remaining part of the acrylic adhesive composition is evenly coated on the second surface of the substrate layer, and dried at 120° C. for 5 min to solidify to form a second adhesive layer with a thickness of 90 μm, and a second release film layer with a thickness of 50 μm is attached to the second adhesive layer to obtain the high-performance acrylic foam tape.

[0032] The beneficial effects of the present invention are:

[0033] The present invention prepares a PET reinforced acrylic foam tape with the properties of impact resistance, drop resistance, rebound resistance, easy removal and the like, and a preparation method thereof. The present invention realizes the control of the performance of the acrylic foam tape by regulating and stabilizing the synthesis of acrylic resin, and can simultaneously meet the excellent impact resistance, drop resistance, rebound resistance and easy removal of the tape; the present invention uses a buffer layer made of foamed microspheres added to glue to replace traditional foam, which not only reduces the cost and improves the adaptability of the glue layer to the buffer layer, but also improves the die-cutting performance; the present invention can improve the performance of the prepared tape by pre-treating the tackifying resin by a special method and then using it. DETAILED DESCRIPTION

[0034] The present invention is further described in detail below in conjunction with embodiments so that those skilled in the art can implement the invention with reference to the description.

[0035] It should be understood that the terms such as “having”, “including” and “comprising” used herein do not exclude the existence or addition of one or more other elements or combinations thereof.

[0036] The test methods used in the following examples are conventional methods unless otherwise specified. The materials and reagents used in the following examples are all commercially available unless otherwise specified. In the following examples, if no specific conditions are specified, the experiments were carried out under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used, if the manufacturer is not specified, are all conventional products that can be purchased commercially.

[0037] The present invention provides a high-performance acrylic foam tape, comprising a substrate layer, a first release film layer, a first adhesive layer, a buffer layer, a substrate layer, a second adhesive layer and a second release film layer which are sequentially stacked;

[0038] The buffer layer is obtained by coating a buffer glue composition on the surface of the substrate layer and then curing the composition. The buffer glue composition includes the following raw material components in parts by weight:

[0039] 80-120 parts of acrylic glue, 21-60 parts of tackifying resin, 0.5-3.5 parts of curing agent, and 0.7-1.4 parts of foamed microspheres.

[0040] In a preferred embodiment, the raw materials for preparing the acrylic glue include the following components by weight:

[0041] 30-65 parts of butyl acrylate, 20-50 parts of isooctyl acrylate, 10-20 parts of cyclohexyl acrylate, 5-10 parts of isobornyl acrylate, 3-5 parts of acrylic acid, 0.1-1 parts of hydroxyethyl acrylate, 0.1-0.5 parts of initiator, and 80-120 parts of solvent.

[0042] In a preferred embodiment, the initiator is a mixture of initiator AIBN and initiator HTP-65W.

[0043] In a preferred embodiment, the acrylate glue is prepared by the following method:

[0044] Butyl acrylate, isooctyl acrylate, cyclohexyl acrylate, isobornyl acrylate, acrylic acid and hydroxyethyl acrylate are uniformly mixed to obtain a monomer mixture, part of the monomer mixture and solvent are added to a reaction container, the temperature is raised to 35-45°C, nitrogen is passed for 15-60 minutes, and then the temperature is raised to 60-65°C, nitrogen is passed, initiator AIBN is added, and the reaction is performed for 0.5-3 hours, and then the remaining monomer mixture is added dropwise for 0.5-3 hours. After the addition is completed, the reaction is continued for 15-60 minutes, the temperature is raised to 68-72°C, initiator HTP-65W is added, and the reaction is continued at this temperature for 2-8 hours to obtain acrylate glue.

[0045] In a preferred embodiment, the acrylic ester glue is prepared by the following method:

[0046] Butyl acrylate, isooctyl acrylate, cyclohexyl acrylate, isobornyl acrylate, acrylic acid and hydroxyethyl acrylate are mixed evenly to obtain a monomer mixture, part of the monomer mixture and solvent are added to a reaction vessel, the temperature is raised to 40°C, nitrogen is passed for 30 minutes, then the temperature is raised to 63°C, nitrogen is kept passing, initiator AIBN is added, and the remaining monomer mixture is added dropwise after reacting for 1.5 hours, the dropping time is 1.5 hours, and the reaction is continued for 0.5 hours after the dropping is completed. The temperature is raised to 70°C, initiator HTP-65W is added, and the reaction is continued at this temperature for 4 hours to obtain acrylate glue.

[0047] In a preferred embodiment, the tackifying resin is selected from a mixture of tackifying resin AS-5100F, tackifying resin TP-2040, and tackifying resin AS-2125D.

[0048] In a preferred embodiment, the first adhesive layer and the second adhesive layer are obtained by coating an acrylic adhesive composition and then curing it. The raw materials for preparing the acrylic adhesive composition include the following components by weight: 80-120 parts of acrylic glue, 21-60 parts of tackifying resin, and 0.5-3.5 parts of curing agent.

[0049] The present invention also provides a method for preparing the high-performance acrylic foam tape as above, comprising the following steps:

[0050] S1, weighing a tackifying resin in advance and pre-treating it, and then mixing the pre-treated tackifying resin with acrylate glue, a curing agent, and foaming microspheres to obtain a buffering glue composition;

[0051] S2, uniformly coating the buffer glue composition on the first surface of the substrate layer, drying and curing to form a buffer layer, and obtaining a semi-finished product;

[0052] S3, mixing the pretreated tackifying resin with the acrylic glue and the curing agent to obtain an acrylic glue composition;

[0053] S4, taking a portion of the acrylic ester adhesive composition and evenly coating it on the first release film layer, drying and curing it to form a first adhesive layer, and then laminating the first adhesive layer to the buffer layer of the semi-finished product;

[0054] The remaining part of the acrylic ester adhesive composition is evenly coated on the second surface of the substrate layer, dried and solidified to form a second adhesive layer, and a second release film layer is attached to the second adhesive layer to obtain a high-performance acrylic foam tape.

[0055] Tackifying resins generally have residual inert solvents and may be contaminated after a certain period of normal storage, which will affect the performance of the tape product. Therefore, pretreatment before use can improve its effect. In a preferred embodiment, the pretreatment method of the tackifying resin is:

[0056] Add the tackifying resin into a hydrochloric acid solution with a concentration of 3-5wt% and soak for 2-4 hours (the liquid level of the solution is 10-20 cm higher than the tackifying resin), then rinse with a hydrochloric acid solution of the same concentration, the ratio of the volume of the hydrochloric acid solution used for elution to the mass of the tackifying resin is 5-7mL / g, and then rinse with deionized water until the pH of the water is neutral;

[0057] Then, the tackifier resin is added to a sodium hydroxide solution with a concentration of 2-10wt% and soaked for 2-4 hours (the liquid level of the solution is 10-20 cm higher than the tackifier resin), and then rinsed with a sodium hydroxide solution of the same concentration, the ratio of the volume of the sodium hydroxide solution used for elution to the mass of the tackifier resin is 5-7mL / g, and then rinsed with deionized water until the pH of the water is neutral, and dried to complete the pretreatment of the tackifier resin.

[0058] In a preferred embodiment, the method for preparing the high-performance acrylic foam tape comprises the following steps:

[0059] S1, weighing a tackifying resin in advance and pre-treating it, and then mixing the pre-treated tackifying resin with acrylate glue, a curing agent, and foaming microspheres to obtain a buffering glue composition;

[0060] S2, uniformly coating the buffer glue composition on the first surface of the 25 μm black PET substrate layer, drying at 120° C. for 5 min to solidify to form a buffer layer with a thickness of 95 μm, to obtain a semi-finished product;

[0061] S3, mixing the pretreated tackifying resin with the acrylic glue and the curing agent to obtain an acrylic glue composition;

[0062] S4, evenly coating a portion of the acrylic ester adhesive composition on a first release film layer with a thickness of 50 μm, drying at 120° C. for 5 min to solidify to form a first adhesive layer with a thickness of 90 μm, and then laminating the first adhesive layer to the buffer layer of the semi-finished product;

[0063] The remaining part of the acrylic adhesive composition was evenly coated on the second surface of the substrate layer, and dried at 120° C. for 5 min to solidify to form a second adhesive layer with a thickness of 90 μm. A second release film layer with a thickness of 50 μm was attached to the second adhesive layer to obtain a high-performance acrylic foam tape.

[0064] The above is the overall concept of the present invention, and detailed embodiments and comparative examples are provided below on the basis of the overall concept of the present invention to further illustrate the present invention.

[0065] The main raw materials in the following examples and comparative examples are from the following sources:

[0066] AS-5100F (tackifying resin): Guangzhou Yabiao Technology Co., Ltd.

[0067] TP-2040 (tackifying resin): Shenzhen Dansong Plastic

[0068] AS-2125D (tackifying resin): Guangzhou Yabiao Technology Co., Ltd.

[0069] AS-2085EP (tackifying resin): Guangzhou Yabiao Technology Co., Ltd.

[0070] Foamed microspheres: MFL-81GCA, Fosman Technology Co., Ltd.

[0071] The pretreatment method of the tackifying resin involved in the following examples and comparative examples is:

[0072] The tackifying resin is added to a hydrochloric acid solution with a concentration of 5wt% and soaked for 4 hours (the liquid level of the solution is 20 cm higher than the tackifying resin), and then rinsed with a hydrochloric acid solution of the same concentration, the ratio of the volume of the hydrochloric acid solution used for elution to the mass of the tackifying resin is 7mL / g (i.e., 7mL of hydrochloric acid solution is used for elution per gram of tackifying resin), and then rinsed with deionized water until the pH of the water is neutral;

[0073] Then add the tackifier resin into a 5wt% sodium hydroxide solution and soak it for 4 hours (the solution level is 20 cm higher than the tackifier resin), then rinse it with a sodium hydroxide solution of the same concentration, the ratio of the volume of the sodium hydroxide solution used for elution to the mass of the tackifier resin is 5-7mL / g, then rinse it with deionized water until the pH of the water is neutral, dry it, and complete the pretreatment of the tackifier resin.

[0074] Example 1

[0075] A high-performance acrylic foam tape, the preparation method of which comprises the following steps:

[0076] Pre-prepare acrylic glue:

[0077] According to weight, 60.5 parts of butyl acrylate, 20 parts of isooctyl acrylate, 10 parts of cyclohexyl acrylate, 6 parts of isobornyl acrylate, 3 parts of acrylic acid and 0.5 parts of hydroxyethyl acrylate were weighed and mixed evenly to obtain a mixed monomer. 30wt% of the mixed monomer and 90 parts of ethyl acetate were placed in a four-necked flask equipped with a stirrer, a condenser and a nitrogen tube, and a water bath was turned on for heating. When the temperature was raised to 40°C, nitrogen was introduced at a flow rate of 100ml / min. After nitrogen was introduced for 30min, 0.1 part of initiator AIBN was added at 63°C, and the nitrogen flow rate was reduced to 30ml / min. After reacting at this temperature for 1.5h, the remaining 70% of the monomer was added dropwise, and the addition time was 1.5h. After the addition was completed, the reaction continued for 0.5h. The temperature was raised to 70°C, and 0.1 part of high-temperature initiator HTP-65W was added. The reaction continued at this temperature for 4h to obtain acrylate glue.

[0078] Weigh the tackifying resin in advance for pretreatment before use.

[0079] S1, weigh 100 parts of glue, 10 parts of AS-5100F (tackifying resin), 15 parts of TP-2040 (tackifying resin), 16 parts of AS-2125D (tackifying resin), 1 part of foamed microspheres, 1.5 parts of isocyanate crosslinking agent (TDI), and 0.2 parts of epoxy curing agent (TETRAD-X), mix them evenly to obtain a buffered glue composition;

[0080] S2, uniformly coating the buffer glue composition on the first surface of the 25 μm black PET substrate layer, drying at 120° C. for 5 min to solidify to form a buffer layer with a thickness of 95 μm, to obtain a semi-finished product;

[0081] S3, weigh 100 parts of glue, 10 parts of AS-5100F (tackifying resin), 15 parts of TP-2040 (tackifying resin), 16 parts of AS-2125D (tackifying resin), 1.5 parts of isocyanate crosslinking agent (TDI), and 0.2 parts of epoxy curing agent (TETRAD-X), and mix them evenly to obtain an acrylate glue composition;

[0082] S4, evenly coating a portion of the acrylic ester adhesive composition on a first release film layer with a thickness of 50 μm, drying at 120° C. for 5 min to solidify to form a first adhesive layer with a thickness of 90 μm, and then laminating the first adhesive layer to the buffer layer of the semi-finished product;

[0083] The remaining part of the acrylic adhesive composition was evenly coated on the second surface of the substrate layer, and dried at 120° C. for 5 min to solidify to form a second adhesive layer with a thickness of 90 μm. A second release film layer with a thickness of 50 μm was attached to the second adhesive layer to obtain a high-performance acrylic foam tape.

[0084] Example 2

[0085] A high-performance acrylic foam tape, the preparation method of which comprises the following steps:

[0086] Pre-prepare acrylic glue:

[0087] According to weight, 62.5 parts of butyl acrylate, 20 parts of isooctyl acrylate, 14 parts of cyclohexyl acrylate, 3 parts of acrylic acid and 0.5 parts of hydroxyethyl acrylate were weighed and mixed evenly to obtain a mixed monomer. 30wt% of the mixed monomer and 90 parts of ethyl acetate were placed in a four-necked flask equipped with a stirrer, a condenser and a nitrogen tube, and a water bath was turned on for heating. When the temperature was raised to 40°C, nitrogen was introduced at a flow rate of 100ml / min. After nitrogen was introduced for 30min, 0.1 part of initiator AIBN was added at 63°C, and the nitrogen flow rate was reduced to 30ml / min. After reacting at this temperature for 1.5h, the remaining 70% of the monomer was added dropwise, and the addition time was 1.5h. After the addition was completed, the reaction continued for 0.5h. The temperature was raised to 70°C, and 0.1 part of high-temperature initiator HTP-65W was added. The reaction continued at this temperature for 4h to obtain acrylate glue.

[0088] Weigh the tackifying resin in advance for pretreatment before use.

[0089] S1, weigh 100 parts of glue, 10 parts of AS-5100F (tackifying resin), 15 parts of TP-2040 (tackifying resin), 16 parts of AS-2125D (tackifying resin), 1 part of foamed microspheres, 1.5 parts of isocyanate crosslinking agent (TDI), and 0.2 parts of epoxy curing agent (TETRAD-X), mix them evenly to obtain a buffered glue composition;

[0090] S2, uniformly coating the buffer glue composition on the first surface of the 25 μm black PET substrate layer, drying at 120° C. for 5 min to solidify to form a buffer layer with a thickness of 95 μm, to obtain a semi-finished product;

[0091] S3, weigh 100 parts of glue, 10 parts of AS-5100F (tackifying resin), 15 parts of TP-2040 (tackifying resin), 16 parts of AS-2125D (tackifying resin), 1.5 parts of isocyanate crosslinking agent (TDI), and 0.2 parts of epoxy curing agent (TETRAD-X), and mix them evenly to obtain an acrylate glue composition;

[0092] S4, evenly coating a portion of the acrylic ester adhesive composition on a first release film layer with a thickness of 50 μm, drying at 120° C. for 5 min to solidify to form a first adhesive layer with a thickness of 90 μm, and then laminating the first adhesive layer to the buffer layer of the semi-finished product;

[0093] The remaining part of the acrylic adhesive composition was evenly coated on the second surface of the substrate layer, and dried at 120° C. for 5 min to solidify to form a second adhesive layer with a thickness of 90 μm. A second release film layer with a thickness of 50 μm was attached to the second adhesive layer to obtain a high-performance acrylic foam tape.

[0094] Example 3

[0095] A high-performance acrylic foam tape, the preparation method of which comprises the following steps:

[0096] Pre-prepare acrylic glue:

[0097] According to weight, 62.5 parts of butyl acrylate, 20 parts of isooctyl acrylate, 14 parts of cyclohexyl acrylate, 3 parts of acrylic acid and 0.5 parts of hydroxyethyl acrylate were weighed and mixed evenly to obtain a mixed monomer. 30wt% of the mixed monomer and 90 parts of ethyl acetate were placed in a four-necked flask equipped with a stirrer, a condenser and a nitrogen tube, and a water bath was turned on for heating. When the temperature was raised to 40°C, nitrogen was introduced at a flow rate of 100ml / min. After nitrogen was introduced for 30min, 0.1 part of initiator AIBN was added at 63°C, and the nitrogen flow rate was reduced to 30ml / min. After reacting at this temperature for 1.5h, the remaining 70% of the monomer was added dropwise, and the addition time was 1.5h. After the addition was completed, the reaction continued for 0.5h. The temperature was raised to 70°C, and 0.1 part of high-temperature initiator HTP-65W was added. The reaction continued at this temperature for 4h to obtain acrylate glue.

[0098] Weigh the tackifying resin in advance for pretreatment before use.

[0099] S1, weigh 100 parts of glue, 10 parts of AS-5100F (tackifying resin), 20 parts of TP-2040 (tackifying resin), 16 parts of AS-2125D (tackifying resin), 1 part of foamed microspheres, 1.5 parts of isocyanate crosslinking agent (TDI), and 0.2 parts of epoxy curing agent (TETRAD-X), mix them evenly to obtain a buffered glue composition;

[0100] S2, uniformly coating the buffer glue composition on the first surface of the 25 μm black PET substrate layer, drying at 120° C. for 5 min to solidify to form a buffer layer with a thickness of 95 μm, to obtain a semi-finished product;

[0101] S3, weigh 100 parts of glue, 10 parts of AS-5100F (tackifying resin), 15 parts of TP-2040 (tackifying resin), 16 parts of AS-2125D (tackifying resin), 1.5 parts of isocyanate crosslinking agent (TDI), and 0.2 parts of epoxy curing agent (TETRAD-X), and mix them evenly to obtain an acrylate glue composition;

[0102] S4, evenly coating a portion of the acrylic ester adhesive composition on a first release film layer with a thickness of 50 μm, drying at 120° C. for 5 min to solidify to form a first adhesive layer with a thickness of 90 μm, and then laminating the first adhesive layer to the buffer layer of the semi-finished product;

[0103] The remaining part of the acrylic adhesive composition was evenly coated on the second surface of the substrate layer, and dried at 120° C. for 5 min to solidify to form a second adhesive layer with a thickness of 90 μm. A second release film layer with a thickness of 50 μm was attached to the second adhesive layer to obtain a high-performance acrylic foam tape.

[0104] Comparative Example 1

[0105] A high-performance acrylic foam tape, the preparation method of which comprises the following steps:

[0106] Pre-prepare acrylic glue:

[0107] According to weight, 75 parts of butyl acrylate, 21 parts of isooctyl acrylate, 3 parts of acrylic acid and 1 part of hydroxyethyl acrylate were weighed and mixed evenly to obtain a mixed monomer. 30wt% of the mixed monomer and 90 parts of ethyl acetate were placed in a four-necked flask equipped with a stirrer, a condenser and a nitrogen tube, and a water bath was turned on for heating. When the temperature was raised to 40°C, nitrogen was introduced at a flow rate of 100ml / min. After nitrogen was introduced for 30min, 0.1 part of initiator AIBN was added at 63°C, and the nitrogen flow rate was reduced to 30ml / min. After reacting at this temperature for 1.5h, the remaining 70% of the monomer was added dropwise for 1.5h. After the addition was completed, the reaction was continued for 0.5h. The temperature was raised to 70°C, and 0.1 part of high-temperature initiator HTP-65W was added. The reaction was continued at this temperature for 4h to obtain acrylate glue.

[0108] Weigh the tackifying resin in advance for pretreatment before use.

[0109] S1, weigh 100 parts of glue, 10 parts of AS-5100F (tackifying resin), 15 parts of TP-2040 (tackifying resin), 16 parts of AS-2125D (tackifying resin), 1 part of foamed microspheres, 1.5 parts of isocyanate crosslinking agent (TDI), and 0.2 parts of epoxy curing agent (TETRAD-X), mix them evenly to obtain a buffered glue composition;

[0110] S2, uniformly coating the buffer glue composition on the first surface of the 25 μm black PET substrate layer, drying at 120° C. for 5 min to solidify to form a buffer layer with a thickness of 95 μm, to obtain a semi-finished product;

[0111] S3, weigh 100 parts of glue, 10 parts of AS-5100F (tackifying resin), 15 parts of TP-2040 (tackifying resin), 16 parts of AS-2125D (tackifying resin), 1.5 parts of isocyanate crosslinking agent (TDI), and 0.2 parts of epoxy curing agent (TETRAD-X), and mix them evenly to obtain an acrylate glue composition;

[0112] S4, evenly coating a portion of the acrylic ester adhesive composition on a first release film layer with a thickness of 50 μm, drying at 120° C. for 5 min to solidify to form a first adhesive layer with a thickness of 90 μm, and then laminating the first adhesive layer to the buffer layer of the semi-finished product;

[0113] The remaining part of the acrylic adhesive composition was evenly coated on the second surface of the substrate layer, and dried at 120° C. for 5 min to solidify to form a second adhesive layer with a thickness of 90 μm. A second release film layer with a thickness of 50 μm was attached to the second adhesive layer to obtain a high-performance acrylic foam tape.

[0114] Comparative Example 2

[0115] A high-performance acrylic foam tape, the preparation method of which comprises the following steps:

[0116] Pre-prepare acrylic glue:

[0117] According to weight, 60.5 parts of butyl acrylate, 20 parts of isooctyl acrylate, 10 parts of cyclohexyl acrylate, 6 parts of isobornyl acrylate, 3 parts of acrylic acid and 0.5 parts of hydroxyethyl acrylate were weighed and mixed evenly to obtain a mixed monomer. 30wt% of the mixed monomer and 90 parts of ethyl acetate were placed in a four-necked flask equipped with a stirrer, a condenser and a nitrogen tube, and a water bath was turned on for heating. When the temperature was raised to 40°C, nitrogen was introduced at a flow rate of 100ml / min. After nitrogen was introduced for 30min, 0.1 part of initiator AIBN was added at 63°C, and the nitrogen flow rate was reduced to 30ml / min. After reacting at this temperature for 1.5h, the remaining 70% of the monomer was added dropwise, and the addition time was 1.5h. After the addition was completed, the reaction continued for 0.5h. The temperature was raised to 70°C, and 0.1 part of high-temperature initiator HTP-65W was added. The reaction continued at this temperature for 4h to obtain acrylate glue.

[0118] Weigh the tackifying resin in advance for pretreatment before use.

[0119] S1, weigh 100 parts of glue, 10 parts of AS-5100F (tackifying resin), 15 parts of TP-2040 (tackifying resin), 16 parts of AS-2125D (tackifying resin), 1 part of foamed microspheres, 1.5 parts of isocyanate crosslinking agent (TDI), and 0.2 parts of epoxy curing agent (TETRAD-X), mix them evenly to obtain a buffered glue composition;

[0120] S2, uniformly coating the buffer glue composition on the first surface of the 25 μm black PET substrate layer, drying at 120° C. for 5 min to solidify to form a buffer layer with a thickness of 95 μm, to obtain a semi-finished product;

[0121] S3, weigh 100 parts of glue, 10 parts of AS-5100F (tackifying resin), 15 parts of TP-2040 (tackifying resin), 16 parts of AS-2125D (tackifying resin), 1.5 parts of isocyanate crosslinking agent (TDI), and 0.2 parts of epoxy curing agent (TETRAD-X), and mix them evenly to obtain an acrylate glue composition;

[0122] S4, evenly coating a portion of the acrylic ester adhesive composition on a first release film layer with a thickness of 50 μm, drying at 120° C. for 5 min to solidify to form a first adhesive layer with a thickness of 90 μm, and then laminating the first adhesive layer to the buffer layer of the semi-finished product;

[0123] The remaining part of the acrylic adhesive composition was evenly coated on the second surface of the substrate layer, and dried at 120° C. for 5 min to solidify to form a second adhesive layer with a thickness of 90 μm. A second release film layer with a thickness of 50 μm was attached to the second adhesive layer to obtain a high-performance acrylic foam tape.

[0124] Comparative Example 3

[0125] A high-performance acrylic foam tape, the preparation method of which comprises the following steps:

[0126] Pre-prepare acrylic glue:

[0127] According to weight, 62.5 parts of butyl acrylate, 20 parts of isooctyl acrylate, 14 parts of cyclohexyl acrylate, 3 parts of acrylic acid and 0.5 parts of hydroxyethyl acrylate were weighed and mixed evenly to obtain a mixed monomer. 30wt% of the mixed monomer and 90 parts of ethyl acetate were placed in a four-necked flask equipped with a stirrer, a condenser and a nitrogen tube, and a water bath was turned on for heating. When the temperature was raised to 40°C, nitrogen was introduced at a flow rate of 100ml / min. After nitrogen was introduced for 30min, 0.1 part of initiator AIBN was added at 63°C, and the nitrogen flow rate was reduced to 30ml / min. After reacting at this temperature for 1.5h, the remaining 70% of the monomer was added dropwise, and the addition time was 1.5h. After the addition was completed, the reaction continued for 0.5h. The temperature was raised to 70°C, and 0.1 part of high-temperature initiator HTP-65W was added. The reaction continued at this temperature for 4h to obtain acrylate glue.

[0128] Weigh the tackifying resin in advance for pretreatment before use.

[0129] S1, weigh 100 parts of glue, 10 parts of AS-5100F (tackifying resin), 15 parts of AS-2085EP (tackifying resin), 16 parts of AS-2125D (tackifying resin), 1 part of foaming microspheres, 1.5 parts of isocyanate crosslinking agent (TDI), and 0.2 parts of epoxy curing agent (TETRAD-X), and mix them evenly to obtain a buffered glue composition;

[0130] S2, uniformly coating the buffer glue composition on the first surface of the 25 μm black PET substrate layer, drying at 120° C. for 5 min to solidify to form a buffer layer with a thickness of 95 μm, to obtain a semi-finished product;

[0131] S3, weigh 100 parts of glue, 10 parts of AS-5100F (tackifying resin), 15 parts of AS-2085EP (tackifying resin), 16 parts of AS-2125D (tackifying resin), 1.5 parts of isocyanate crosslinking agent (TDI), and 0.2 parts of epoxy curing agent (TETRAD-X), and mix them evenly to obtain an acrylate glue composition;

[0132] S4, evenly coating a portion of the acrylic ester adhesive composition on a first release film layer with a thickness of 50 μm, drying at 120° C. for 5 min to solidify to form a first adhesive layer with a thickness of 90 μm, and then laminating the first adhesive layer to the buffer layer of the semi-finished product;

[0133] The remaining part of the acrylic adhesive composition was evenly coated on the second surface of the substrate layer, and dried at 120° C. for 5 min to solidify to form a second adhesive layer with a thickness of 90 μm. A second release film layer with a thickness of 50 μm was attached to the second adhesive layer to obtain a high-performance acrylic foam tape.

[0134] Comparative Example 4

[0135] A high-performance acrylic foam tape, the preparation method of which comprises the following steps:

[0136] Pre-prepare acrylic glue:

[0137] According to weight, 62.5 parts of butyl acrylate, 20 parts of isooctyl acrylate, 14 parts of cyclohexyl acrylate, 3 parts of acrylic acid and 0.5 parts of hydroxyethyl acrylate were weighed and mixed evenly to obtain a mixed monomer. 30wt% of the mixed monomer and 90 parts of ethyl acetate were placed in a four-necked flask equipped with a stirrer, a condenser and a nitrogen tube, and a water bath was turned on for heating. When the temperature was raised to 40°C, nitrogen was introduced at a flow rate of 100ml / min. After nitrogen was introduced for 30min, 0.1 part of initiator AIBN was added at 63°C, and the nitrogen flow rate was reduced to 30ml / min. After reacting at this temperature for 1.5h, the remaining 70% of the monomer was added dropwise, and the addition time was 1.5h. After the addition was completed, the reaction continued for 0.5h. The temperature was raised to 70°C, and 0.1 part of high-temperature initiator HTP-65W was added. The reaction continued at this temperature for 4h to obtain acrylate glue.

[0138] In this example, the tackifying resin was used directly without any pretreatment.

[0139] S1, weigh 100 parts of glue, 10 parts of AS-5100F (tackifying resin), 15 parts of TP-2040 (tackifying resin), 16 parts of AS-2125D (tackifying resin), 1 part of foamed microspheres, 1.5 parts of isocyanate crosslinking agent (TDI), and 0.2 parts of epoxy curing agent (TETRAD-X), mix them evenly to obtain a buffered glue composition;

[0140] S2, uniformly coating the buffer glue composition on the first surface of the 25 μm black PET substrate layer, drying at 120° C. for 5 min to solidify to form a buffer layer with a thickness of 95 μm, to obtain a semi-finished product;

[0141] S3, weigh 100 parts of glue, 10 parts of AS-5100F (tackifying resin), 15 parts of TP-2040 (tackifying resin), 16 parts of AS-2125D (tackifying resin), 1.5 parts of isocyanate crosslinking agent (TDI), and 0.2 parts of epoxy curing agent (TETRAD-X), and mix them evenly to obtain an acrylate glue composition;

[0142] S4, evenly coating a portion of the acrylic ester adhesive composition on a first release film layer with a thickness of 50 μm, drying at 120° C. for 5 min to solidify to form a first adhesive layer with a thickness of 90 μm, and then laminating the first adhesive layer to the buffer layer of the semi-finished product;

[0143] The remaining part of the acrylic adhesive composition was evenly coated on the second surface of the substrate layer, and dried at 120° C. for 5 min to solidify to form a second adhesive layer with a thickness of 90 μm. A second release film layer with a thickness of 50 μm was attached to the second adhesive layer to obtain a high-performance acrylic foam tape.

[0144] The performance tests were performed on the high-performance acrylic foam tapes prepared in the examples and comparative examples:

[0145] 1. 180° peel strength test method:

[0146] One side of the 25mm wide tape was attached to a standard steel plate, and rolled back and forth twice with a 2kg roller (600mm / min), and placed at room temperature (23±2℃, relative humidity 50%) for 20 minutes. Then, a universal tensile testing machine was used to perform 180° peeling at 300mm / min, and the test was repeated three times to obtain the average value.

[0147] 2. Push-out force test method: Make the tape into a hollow sample with an outer diameter of 33mm*33mm and an inner diameter of 29mm*29mm, stick the two sides to the PC board, press with a force of 248N for 5 seconds, place it at room temperature (23±2℃, relative humidity 50%) for 24h, and then use a universal tensile testing machine to test at a push-out speed of 10mm / min. Test 3 times and take the average value.

[0148] 3. Ball drop test method: make the tape into a hollow sample with an outer diameter of 33mm*33mm and an inner diameter of 29mm*29mm, stick the PC boards on both sides, press them with a force of 248N for 5 seconds, place them at room temperature (23±2℃, relative humidity 50%) for 24h, then use a 67g steel ball to freely fall from different heights to hit the sample, the value of the sample rupture is recorded as the value at that height, test 3 times and take the average value.

[0149] 4. Anti-rebound ability, test method: make a 150mm long and 20mm wide strip of tape, stick it on the surface of a standard aluminum plate (specification: 150mm*20mm*0.5mm), roll it back and forth with a 4kg roller twice (10m / min), place it at room temperature (23±2℃, relative humidity 50%) for 24 hours, then place it in a 50℃, 95%RH test environment, and measure the warping height (mm) at both ends after 15min, 30min, 1h, 2h, 4h, 24h, and 48h. Warping height (mm) = left height + right height. If the warping height is 0-5mm: very good, 6-15mm: good, 16-25mm: average, 26-40mm: poor.

[0150] The test results are shown in Table 1 below:

[0151] Table 1

[0152]

[0153] According to the test results in Table 1, it can be seen that the performance of various tests of Examples 1-3 is relatively excellent. The performance of Comparative Example 1 is significantly reduced due to the difference in monomer types; Comparative Example 2 changes the monomer ratio and also causes most of the performance to be significantly reduced; Comparative Example 3 replaces one of the tackifying resins, resulting in a significant decrease in peel strength, which illustrates the advantages of the specially formulated tackifying resin combination in the present invention; The tackifying resin in Comparative Example 4 has not been pretreated, and various performances have been significantly reduced.

[0154] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to specific details.

Claims

1. A high-performance acrylic foam tape, characterized in that: It includes a substrate layer, a first release film layer, a first adhesive layer, a buffer layer, a substrate layer, a second adhesive layer and a second release film layer which are stacked in sequence; The buffer layer is obtained by coating a buffer glue composition on the surface of the substrate layer and then curing the composition. The buffer glue composition includes the following raw material components in parts by weight: 80-120 parts of acrylic glue, 21-60 parts of tackifying resin, 0.5-3.5 parts of curing agent, and 0.7-1.4 parts of foamed microspheres.

2. The high performance acrylic foam tape according to claim 1, characterized in that: The raw materials for preparing the acrylic glue include the following components by weight: 30-65 parts of butyl acrylate, 20-50 parts of isooctyl acrylate, 10-20 parts of cyclohexyl acrylate, 5-10 parts of isobornyl acrylate, 3-5 parts of acrylic acid, 0.1-1 parts of hydroxyethyl acrylate, 0.1-0.5 parts of initiator, and 80-120 parts of solvent.

3. The high performance acrylic foam tape according to claim 2, characterized in that: The initiator is a mixture of initiator AIBN and initiator HTP-65W.

4. The high performance acrylic foam tape according to claim 3, characterized in that: The acrylic glue is prepared by the following method: Butyl acrylate, isooctyl acrylate, cyclohexyl acrylate, isobornyl acrylate, acrylic acid and hydroxyethyl acrylate are uniformly mixed to obtain a monomer mixture, part of the monomer mixture and solvent are added to a reaction container, the temperature is raised to 35-45°C, nitrogen is passed for 15-60 minutes, and then the temperature is raised to 60-65°C, nitrogen is passed, initiator AIBN is added, and the reaction is performed for 0.5-3 hours, and then the remaining monomer mixture is added dropwise for 0.5-3 hours. After the addition is completed, the reaction is continued for 15-60 minutes, the temperature is raised to 68-72°C, initiator HTP-65W is added, and the reaction is continued at this temperature for 2-8 hours to obtain acrylate glue.

5. The high performance acrylic foam tape according to claim 4, characterized in that: The acrylic glue is prepared by the following method: Butyl acrylate, isooctyl acrylate, cyclohexyl acrylate, isobornyl acrylate, acrylic acid and hydroxyethyl acrylate are mixed evenly to obtain a monomer mixture, part of the monomer mixture and solvent are added to a reaction vessel, the temperature is raised to 40°C, nitrogen is passed for 30 minutes, then the temperature is raised to 63°C, nitrogen is kept passing, initiator AIBN is added, and the remaining monomer mixture is added dropwise after reacting for 1.5 hours, the dropping time is 1.5 hours, and the reaction is continued for 0.5 hours after the dropping is completed. The temperature is raised to 70°C, initiator HTP-65W is added, and the reaction is continued at this temperature for 4 hours to obtain acrylate glue.

6. The high performance acrylic foam tape according to claim 1, characterized in that: The tackifying resin is selected from a mixture of tackifying resin AS-5100F, tackifying resin TP-2040, and tackifying resin AS-2125D.

7. The high performance acrylic foam tape according to claim 1, characterized in that: The first adhesive layer and the second adhesive layer are both obtained by coating an acrylic adhesive composition and then curing it. The raw materials for preparing the acrylic adhesive composition include the following components by weight: 80-120 parts of acrylic glue, 21-60 parts of tackifying resin, and 0.5-3.5 parts of curing agent.

8. A method for preparing a high-performance acrylic foam tape as claimed in any one of claims 1 to 7, characterized in that: The following steps are involved: S1, weighing a tackifying resin in advance and pre-treating it, and then uniformly mixing the pre-treated tackifying resin with acrylate glue, a curing agent, and foaming microspheres to obtain a buffering glue composition; S2, uniformly coating the buffer glue composition on the first surface of the substrate layer, drying and curing to form a buffer layer, and obtaining a semi-finished product; S3, mixing the pretreated tackifying resin with the acrylic glue and the curing agent to obtain an acrylic glue composition; S4, taking a portion of the acrylic ester adhesive composition and evenly coating it on the first release film layer, drying and curing it to form a first adhesive layer, and then laminating the first adhesive layer to the buffer layer of the semi-finished product; The remaining part of the acrylic ester adhesive composition is evenly coated on the second surface of the substrate layer, dried and solidified to form a second adhesive layer, and a second release film layer is attached to the second adhesive layer to obtain the high-performance acrylic foam tape.

9. The method for preparing the high-performance acrylic foam tape according to claim 8, characterized in that: The pretreatment method of the tackifying resin is: Add the tackifying resin into a hydrochloric acid solution with a concentration of 3-5wt% and soak for 2-4 hours, then rinse with a hydrochloric acid solution of the same concentration, the ratio of the volume of the hydrochloric acid solution used for elution to the mass of the tackifying resin is 5-7mL / g, and then rinse with deionized water until the pH of the water is neutral; The tackifying resin is then added to a sodium hydroxide solution with a concentration of 2-10wt% and soaked for 2-4 hours, then rinsed with a sodium hydroxide solution of the same concentration, the ratio of the volume of the sodium hydroxide solution used for elution to the mass of the tackifying resin being 5-7mL / g, then rinsed with deionized water until the pH of the effluent is neutral, and dried to complete the pretreatment of the tackifying resin.

10. The method for preparing the high-performance acrylic foam tape according to claim 8, characterized in that: The following steps are involved: S1, weighing a tackifying resin in advance and pre-treating it, and then uniformly mixing the pre-treated tackifying resin with acrylate glue, a curing agent, and foaming microspheres to obtain a buffering glue composition; S2, uniformly coating the buffer glue composition on the first surface of the 25 μm black PET substrate layer, drying at 120° C. for 5 min to solidify to form a buffer layer with a thickness of 95 μm, to obtain a semi-finished product; S3, mixing the pretreated tackifying resin with the acrylic glue and the curing agent to obtain an acrylic glue composition; S4, evenly coating a portion of the acrylic ester adhesive composition on a first release film layer with a thickness of 50 μm, drying at 120° C. for 5 min to solidify to form a first adhesive layer with a thickness of 90 μm, and then laminating the first adhesive layer to the buffer layer of the semi-finished product; The remaining part of the acrylic adhesive composition is evenly coated on the second surface of the substrate layer, and dried at 120° C. for 5 min to solidify to form a second adhesive layer with a thickness of 90 μm, and a second release film layer with a thickness of 50 μm is attached to the second adhesive layer to obtain the high-performance acrylic foam tape.

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