Acrylic foam tape as well as preparation method and application thereof

Abstract

The invention relates to an acrylic foam tape as well as a preparation method and application thereof. The acrylic foam adhesive tape comprises an acrylic foam layer and a release layer which are arranged in sequence, the preparation raw materials of the acrylic foam layer comprise the following components in parts by weight: 80-90 parts of an acrylic prepolymer; 1-3 parts of a first hard monomer; 5-10 parts of a first functional monomer; 0.06 to 0.2 part of a second functional monomer; 5-9 parts of hollow glass beads; 1.5 to 3 parts of fumed silica; 0.2 to 0.4 part of a first photoinitiator; and 0.1 to 0.5 part of color paste. The acrylic foam tape provided by the invention has excellent high-temperature resistance and also has good mechanical properties and compression recovery performance.

Description

Technical Field

[0001] This invention relates to the field of adhesive tape technology, and in particular to an acrylic foam tape, its preparation method, and its application. Background Technology

[0002] Currently, with the vigorous development of new energy vehicles, the safety performance requirements for batteries are becoming increasingly stringent, and the sealing process and sealing strips of the battery pack frame play a decisive role in its safety.

[0003] Generally, foam tape has a temperature resistance of 80℃, which is not high. When used, foam tape adheres to different material surfaces. Under high temperature conditions, it is prone to falling off due to low adhesion and poor bonding performance. As a result, when foam tape is used for bonding equipment, it is easy to fail due to the heat generated by the equipment surface.

[0004] Therefore, designing and providing a foam tape with high-temperature resistance has become an urgent problem to be solved. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides an acrylic foam tape, its preparation method, and its applications. The acrylic foam tape provided by this invention possesses excellent high-temperature resistance, as well as good mechanical properties and compression recovery performance.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] In a first aspect, the present invention provides an acrylic foam tape, the acrylic foam tape comprising an acrylic foam layer and a release layer disposed sequentially thereon;

[0008] The raw materials for preparing the acrylic foam layer include the following components in parts by weight:

[0009] 80-90 parts of acrylic prepolymer;

[0010] 1-3 parts of the first hard monomer;

[0011] 5-10 parts of the first functional monomer;

[0012] Secondary functional monomer 0.06-2 parts;

[0013] 5-9 parts of hollow glass microspheres;

[0014] 1.5-3 parts of fumed silica;

[0015] 0.2-0.4 parts of the first photoinitiator;

[0016] 0.1-0.5 parts of colorant.

[0017] This invention designs the raw material components for preparing acrylic foam layers. By combining components in specific weight proportions, the resulting acrylic foam tape exhibits excellent high-temperature resistance, stable adhesion, and superior bonding effect. The acrylic foam tape maintains long-term adhesion at 180°C, with a high-temperature holding power greater than 168 hours without falling off. It can maintain short-term use at ultra-high temperatures of 220°C. It demonstrates stable peel strength at room temperature (25°C, 72 hours) and high temperature (150°C, 168 hours) for interfaces such as SUS (mirror steel plate), painted panels, glass, and PC. It also possesses good mechanical properties (such as tensile strength, elongation at break, dynamic shear strength, and pull-out strength) and compression recovery performance.

[0018] It should be noted that the present invention does not have any special limitations on the specific selection of the release layer. Commonly used release layer materials in the art are applicable, including but not limited to polyethylene (PE) release film.

[0019] The acrylic prepolymer in the raw materials for preparing the acrylic foam layer provided by this invention has a weight ratio of 80 parts, 81 parts, 82 parts, 83 parts, 84 parts, 85 parts, 86 parts, 87 parts, 88 parts, 89 parts, or the specific values ​​between the above values. Due to space limitations and for the sake of brevity, this invention will not exhaustively list the specific values ​​included in the range.

[0020] The raw materials for preparing the acrylic foam layer provided by this invention contain 1 part, 1.2 parts, 1.5 parts, 1.8 parts, 2 parts, 2.2 parts, 2.5 parts, 2.8 parts, or 3 parts by weight, as well as specific values ​​between the above values. Due to space limitations and for the sake of brevity, this invention will not exhaustively list all the specific values ​​included in the range.

[0021] The raw materials for preparing the acrylic foam layer provided by this invention contain 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, or 10 parts by weight of the first functional monomer, as well as specific values ​​between the above values. Due to space limitations and for the sake of brevity, this invention will not exhaustively list all the specific values ​​included in the range.

[0022] The weight percentages of the second functional monomer in the raw materials for preparing the acrylic foam layer provided by this invention are 0.06 parts, 0.08 parts, 0.1 parts, 0.12 parts, 0.14 parts, 0.16 parts, 0.18 parts, or 0.2 parts, as well as specific values ​​between the above-mentioned values. Due to space limitations and for the sake of brevity, this invention will not exhaustively list the specific values ​​included in the range.

[0023] The hollow glass microspheres in the raw materials for preparing the acrylic foam layer provided by this invention are 5 parts, 5.5 parts, 6 parts, 6.5 parts, 7 parts, 7.5 parts, 8 parts, 8.5 parts, or 9 parts by weight, as well as specific values ​​between the above-mentioned values. Due to space limitations and for the sake of brevity, this invention will not exhaustively list the specific values ​​included in the range.

[0024] The raw materials for preparing the acrylic foam layer provided by this invention contain 1.5 parts, 1.8 parts, 2 parts, 2.2 parts, 2.5 parts, 2.8 parts, 2.9 parts, or 3 parts by weight of fumed silica, as well as specific values ​​between the above-mentioned values. Due to space limitations and for the sake of brevity, this invention will not exhaustively list all the specific values ​​included in the range.

[0025] The weight parts of the first photoinitiator in the raw materials for preparing the acrylic foam layer provided by the present invention are 0.2 parts, 0.22 parts, 0.25 parts, 0.28 parts, 0.3 parts, 0.32 parts, 0.35 parts, 0.38 parts or 0.4 parts, as well as specific values ​​between the above-mentioned values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0026] The color paste in the raw materials for preparing the acrylic foam layer provided by this invention has a weight ratio of 0.1 parts, 0.15 parts, 0.2 parts, 0.25 parts, 0.3 parts, 0.35 parts, 0.4 parts, 0.45 parts, or 0.5 parts, as well as specific values ​​between the above values. Due to space limitations and for the sake of brevity, this invention will not exhaustively list the specific values ​​included in the range.

[0027] The following are preferred technical solutions of the present invention, but are not intended to limit the technical solutions provided by the present invention. The purpose and beneficial effects of the present invention can be better achieved and realized through the following preferred technical solutions.

[0028] As a preferred embodiment of the present invention, the raw materials for preparing the acrylic prepolymer include the following components in parts by weight:

[0029] 65-75 parts of the first soft monomer;

[0030] 10-15 parts of the second hard monomer;

[0031] 15-20 parts of the third functional monomer;

[0032] 0.01-0.1 parts of the second photoinitiator;

[0033] Chain transfer agent 0.001-0.005 parts.

[0034] This invention optimizes the design of raw materials for preparing acrylic prepolymers by combining a second hard monomer and a third functional monomer, which can effectively exert a synergistic effect. This, combined with other raw material components, results in acrylic foam tapes with superior high-temperature resistance and mechanical properties.

[0035] The raw materials for preparing the acrylic acid prepolymer provided by this invention contain 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, or 75 parts by weight, as well as specific values ​​between the above values. Due to space limitations and for the sake of brevity, this invention will not exhaustively list all the specific values ​​included in the range.

[0036] The weight parts of the second hard monomer in the raw materials for preparing the acrylic acid prepolymer provided by the present invention are 10 parts, 10.5 parts, 11 parts, 11.5 parts, 12 parts, 12.5 parts, 13 parts, 13.5 parts, 14 parts, 14.5 parts, or 15 parts, as well as specific values ​​between the above-mentioned values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0037] The weight parts of the third functional monomer in the raw materials for preparing the acrylic acid prepolymer provided by the present invention are 15 parts, 15.5 parts, 16 parts, 16.5 parts, 17 parts, 17.5 parts, 18 parts, 18.5 parts, 19 parts, 19.5 parts, or 20 parts, as well as specific values ​​between the above-mentioned values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0038] The weight parts of the second photoinitiator in the raw materials for preparing the acrylic prepolymer provided by the present invention are 0.01 parts, 0.02 parts, 0.03 parts, 0.04 parts, 0.05 parts, 0.06 parts, 0.07 parts, 0.08 parts, 0.09 parts, or 0.1 parts, as well as specific values ​​between the above-mentioned values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0039] The chain transfer agent in the raw materials for preparing the acrylic acid prepolymer provided by this invention is present in weight parts of 0.001 parts, 0.0015 parts, 0.002 parts, 0.0025 parts, 0.003 parts, 0.0035 parts, 0.004 parts, 0.0045 parts, or 0.005 parts, as well as specific values ​​between the above values. Due to space limitations and for the sake of brevity, this invention will not exhaustively list all the specific values ​​included in the range.

[0040] Preferably, the first soft monomer comprises any one or a combination of at least two of butyl acrylate (BA), isooctyl acrylate (EHA), 2-ethylhexyl acrylate (EHA), isodecanyl acrylate, lauryl methacrylate, or lauryl acrylate.

[0041] Preferably, the second hard monomer comprises any one or a combination of at least two of methyl methacrylate (MMA), hydroxyethyl acrylate (HEA), acrylic acid (AA), or 4-hydroxybutyl acrylate (HBA) and vinyl acetate.

[0042] Preferably, the third functional monomer includes any one or a combination of at least two of N-hydroxymethylacrylamide (NMA), n-hexyl acrylate, hydroxyethyl methacrylate (HEMA), or N,N-dimethylacrylamide (DMAA).

[0043] Preferably, the second photoinitiator comprises any one or a combination of at least two of 1-hydroxycyclohexylphenyl ketone (photoinitiator 184), 2,4,6-trimethylbenzoyl-diphenylphosphine oxide (photoinitiator TPO), benzoyldimethyl ketal (photoinitiator 651), or phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide (photoinitiator 819).

[0044] Preferably, the chain transfer agent comprises any one or a combination of at least two of thiols, thioethers, or carbon tetrachloride.

[0045] Preferably, the thiol comprises dodecyl thiol (NDDM).

[0046] Preferably, the acrylic acid prepolymer is prepared by polymerization of a first soft monomer, a second hard monomer, a third functional monomer, a second photoinitiator, and a chain transfer agent.

[0047] Preferably, the polymerization reaction further includes a mixing step.

[0048] Preferably, the mixing temperature is 20-30℃, for example, it can be 20℃, 21℃, 22℃, 23℃, 24℃, 25℃, 26℃, 27℃, 28℃, 29℃ or 30℃, as well as specific values ​​between the above points. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0049] Preferably, the mixing time is 30-50 min, for example, it can be 30 min, 32 min, 35 min, 38 min, 40 min, 42 min, 45 min, 48 min or 50 min, as well as specific values ​​between the above values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0050] Preferably, the mixing is carried out in a protective gas atmosphere.

[0051] Preferably, the protective gas includes any one or a combination of at least two of nitrogen, argon, or helium.

[0052] Preferably, the polymerization reaction is carried out under a low-pressure mercury lamp.

[0053] Preferably, the temperature rise range of the polymerization reaction is 15-25℃, for example, it can be 15℃, 15.5℃, 16℃, 16.5℃, 17℃, 17.5℃, 18℃, 19℃, 20℃, 22℃ or 25℃, as well as specific values ​​between the above points. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0054] In this invention, when the temperature rises to 15-25°C during the preparation of the acrylic acid prepolymer, it indicates that the polymerization reaction is complete. Here, "temperature rise" refers to the temperature increase based on the initial temperature.

[0055] Preferably, the mass ratio of the first hard monomer to the first functional monomer in the raw materials for preparing the acrylic foam layer is 1:(3.5-5), wherein (3.5-5) can be, for example, 3.5, 3.7, 4, 4.2, 4.4, 4.6, 4.8 or 5, and specific values ​​between the above values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0056] In this invention, by optimizing the mass ratio of the first hard monomer and the first functional monomer in the raw materials for preparing the acrylic foam layer, the overall performance of the resulting acrylic foam tape in terms of high-temperature resistance, mechanical properties, and compression recovery properties can be further improved. When the mass ratio of the two is low, i.e., the proportion of the first functional monomer is high, the mechanical properties deteriorate; when the mass ratio of the two is high, i.e., the proportion of the first hard monomer is high, the hardness of the adhesive layer increases, the compression recovery performance deteriorates, and the peel force and high-temperature peel force decrease, affecting subsequent applications.

[0057] Preferably, the first hard monomer comprises any one or a combination of at least two of isobornyl acrylate, acrylic acid, methyl methacrylate or dicyclopentadiene acrylate.

[0058] Preferably, the first functional monomer comprises any one or a combination of at least two of isodecanyl acrylate, dodecyl 2-acrylate, β-carboxyethyl acrylate, or cyclohexylamine.

[0059] Preferably, the second functional monomer comprises any one or a combination of at least two of lauryl acrylate, hydroxyethyl acrylate, 1,6-hexanediol diacrylate, or N-vinylpyrrolidone.

[0060] Preferably, the first photoinitiator comprises any one or a combination of at least two of 1-hydroxycyclohexylphenyl ketone, diphenyl-(2,4,6-trimethylbenzoyl)phosphine oxide, or phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide.

[0061] Preferably, the first photoinitiator is selected from a combination of 1-hydroxycyclohexylphenyl ketone, diphenyl-(2,4,6-trimethylbenzoyl)phosphine oxide and phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide.

[0062] Preferably, the weight percentage of 1-hydroxycyclohexylphenyl ketone in the first photoinitiator is 0.1-0.2 parts, for example, 0.1 parts, 0.11 parts, 0.12 parts, 0.13 parts, 0.14 parts, 0.15 parts, 0.16 parts, 0.17 parts, 0.18 parts, 0.19 parts, or 0.2 parts, as well as specific values ​​between the above-mentioned values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0063] Preferably, the weight fraction of diphenyl-(2,4,6-trimethylbenzoyl)phosphine oxychloride in the first photoinitiator is 0.05-0.1 parts, for example, 0.05 parts, 0.06 parts, 0.07 parts, 0.08 parts, 0.09 parts or 0.1 parts, and specific values ​​between the above values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0064] Preferably, the weight percentage of phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide in the first photoinitiator is 0.05-0.1 parts, for example, 0.05 parts, 0.06 parts, 0.07 parts, 0.08 parts, 0.09 parts or 0.1 parts, and specific values ​​between the above-mentioned values. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0065] It should be noted that the present invention does not have any special limitation on the specific type of pigment. Commonly used pigments in the art are applicable, including but not limited to commercially available blue pigments, red pigments, black pigments, etc.

[0066] Preferably, the release layer comprises a polyolefin release film and / or a polyester release film.

[0067] Preferably, the polyolefin release film includes a polypropylene (PP) release film and / or a polyethylene (PE) release film.

[0068] Preferably, the polyester release film comprises polyethylene terephthalate (PET) release film.

[0069] It should be noted that there is no special limitation on the thickness of the release layer in this invention, and the release layer thickness commonly used in the art is applicable.

[0070] In a second aspect, the present invention provides a method for preparing acrylic foam tape as described in the first aspect, the method comprising the following steps:

[0071] The raw materials for preparing the acrylic foam layer are mixed and coated onto the release layer, then cured to obtain the acrylic foam tape.

[0072] It should be noted that the present invention does not have a special limitation on the mixing temperature of the raw materials for preparing the acrylic foam layer; mixing at room temperature is sufficient, but is exemplarily limited to, but not limited to, 20-30°C.

[0073] Preferably, the mixing time is 90-120 min, for example, it can be 90 min, 95 min, 100 min, 105 min, 110 min, 115 min or 120 min, as well as specific values ​​between the above points. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list the specific values ​​included in the range.

[0074] Preferably, the curing method includes low-pressure functional light curing with a light intensity of 5-10 mw / cm². 2 For example, it can be 5mw / cm 2 5.5 mw / cm 2 6 mw / cm 2 6.5 mw / cm 2 7 mw / cm 2 7.5 mw / cm 2 8 mw / cm 2 8.5 mw / cm 2 9mw / cm 2 9.5 mw / cm 2 Or 10 mw / cm 2 As well as the specific point values ​​between the above point values, due to space limitations and for the sake of brevity, this invention will not exhaustively list the specific point values ​​included in the range.

[0075] Preferably, the curing energy is 1500-2500 mJ / cm². 2 For example, it can be 1500 mj / cm 2 1600 mj / cm 2 1700 mj / cm2 1800 mj / cm 2 1900 mj / cm 2 2000 mj / cm 2 2100 mj / cm 2 2200 mj / cm 2 2300 mj / cm 2 2400 mj / cm 2 Or 2500 mj / cm 2 As well as the specific point values ​​between the above point values, due to space limitations and for the sake of brevity, this invention will not exhaustively list the specific point values ​​included in the range.

[0076] Thirdly, the present invention provides an application of the acrylic foam tape as described in the first aspect in the fields of electronics, building materials, medical devices, or automobile manufacturing.

[0077] Compared with the prior art, the present invention has at least the following beneficial effects:

[0078] (1) The present invention designs the raw material components for the preparation of acrylic foam layer. By matching the components in specific weight proportions, the resulting acrylic foam tape can have excellent high temperature resistance. The acrylic foam tape can maintain a long-term adhesive effect at 180°C and retain its high temperature force for more than 168 hours without falling off. It can maintain short-term use at ultra-high temperature of 220°C. It has stable room temperature and high temperature peel strength for interfaces such as SUS / painted board / glass / PC, and also has good mechanical properties and compression recovery properties.

[0079] (2) The acrylic foam tape provided by this invention exhibits a static shear strength of not less than 168 h at both room temperature and high temperature; its peel strength at room temperature to the interfaces of SUS, glass, and painted panels is 3.148-3.660 N / mm, 3.154-3.580 N / mm, and 3.067-3.690 N / mm, respectively, and its peel strength at high temperature to the interfaces of SUS, glass, and painted panels is 3.484-4.350 N / mm, 3.535-4.420 N / mm, and 3.446-4.310 N / mm, respectively; its tensile strength is 0.55-0.70 MPa, and its elongation at break is 600-750%; its dynamic shear strength is 0.56-0.75 MPa; its pull-out strength is 0.58-0.75 MPa; and its compressive stress at compression rates of 20%, 40%, and 60% is 0.425-0.654 MPa, respectively. MPa, 1.158-2.082 MPa, 4.842-6.325 MPa. Detailed Implementation

[0080] To facilitate understanding of the present invention, the following embodiments are provided. Those skilled in the art should understand that these embodiments are merely illustrative and should not be construed as limiting the scope of the invention.

[0081] Unless otherwise specified, all reagents and raw materials used in the following examples and comparative examples are commercially available products. Some raw material information is as follows:

[0082] The release layer is made of polyethylene (PE) release film;

[0083] The hollow glass microspheres are FN-80GSD;

[0084] The fumed silica is Evonik R972.

[0085] Example 1

[0086] This embodiment provides an acrylic foam tape and its preparation method, wherein the acrylic foam tape comprises an acrylic foam layer and a release layer arranged sequentially.

[0087] The raw materials for preparing the acrylic foam layer include the following components in parts by weight:

[0088] 90 parts of acrylic prepolymer;

[0089] 2 parts of isoborneol acrylate;

[0090] 8 parts of β-carboxyethyl acrylate;

[0091] 0.1 part of 1,6-hexanediol diacrylate;

[0092] Six portions of hollow glass microspheres;

[0093] 2 parts of fumed silica;

[0094] 0.16 parts of 1-hydroxycyclohexylphenyl ketone;

[0095] 0.08 parts of diphenyl-(2,4,6-trimethylbenzoyl)phosphine oxide;

[0096] 0.08 parts of phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide;

[0097] 0.3 parts of black pigment.

[0098] The raw materials for preparing the acrylic acid prepolymer include the following components in parts by weight:

[0099] 70 parts of isooctyl acrylate;

[0100] 10 parts acrylic acid;

[0101] 20 parts of N,N-dimethylacrylamide;

[0102] 0.05 parts of 1-hydroxycyclohexylphenyl ketone;

[0103] 0.0025 parts of n-dodecyl mercaptan.

[0104] The preparation method of the acrylic foam tape includes the following steps:

[0105] Under a nitrogen atmosphere, isooctyl acrylate, acrylic acid, N,N-dimethacrylamide, 1-hydroxycyclohexylphenyl ketone and n-dodecyl mercaptan were mixed at 25°C for 40 min, and then polymerized under a low-pressure mercury lamp to obtain the acrylic acid prepolymer. The polymerization temperature was increased to 20°C.

[0106] Acrylic prepolymer, isoborneol acrylate, β-carboxyethyl acrylate, 1,6-hexanediol diacrylate, hollow glass microspheres, fumed silica, 1-hydroxycyclohexylphenyl ketone, diphenyl-(2,4,6-trimethylbenzoyl)phosphine oxide, phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide, and black pigment were mixed and stirred at 25°C for 120 min, and then coated onto the release layer surface. The mixture was then subjected to a light intensity of 8 mw / cm². 2 The acrylic foam tape was cured under a low-pressure mercury lamp for 4 minutes to obtain the acrylic foam tape.

[0107] Example 2

[0108] This embodiment provides an acrylic foam tape and its preparation method, wherein the acrylic foam tape comprises an acrylic foam layer and a release layer arranged sequentially.

[0109] The raw materials for preparing the acrylic foam layer include the following components in parts by weight:

[0110] 87 parts of acrylic prepolymer;

[0111] 3 parts of isoborneol acrylate;

[0112] 5 parts of β-carboxyethyl acrylate;

[0113] 0.06 parts of 1,6-hexanediol diacrylate;

[0114] 5 parts of hollow glass microspheres;

[0115] 1.5 parts of fumed silica;

[0116] 0.2 parts of 1-hydroxycyclohexylphenyl ketone;

[0117] 0.1 parts of diphenyl-(2,4,6-trimethylbenzoyl)phosphine;

[0118] 0.1 parts of phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide;

[0119] 0.5 parts of black pigment.

[0120] The raw materials for preparing the acrylic acid prepolymer include the following components in parts by weight:

[0121] 75 parts of isooctyl acrylate;

[0122] 12 parts acrylic acid;

[0123] 18 parts of N,N-dimethylacrylamide;

[0124] 0.01 parts of 1-hydroxycyclohexylphenyl ketone;

[0125] 0.001 parts of n-dodecyl mercaptan.

[0126] The preparation method of the acrylic foam tape includes the following steps:

[0127] Under a nitrogen atmosphere, isooctyl acrylate, acrylic acid, N,N-dimethacrylamide, 1-hydroxycyclohexylphenyl ketone and n-dodecyl mercaptan were mixed at 20°C for 50 min, and then polymerized under a low-pressure mercury lamp to obtain the acrylic acid prepolymer. The polymerization temperature was increased to 18°C.

[0128] Acrylic prepolymer, isoborneol acrylate, β-carboxyethyl acrylate, 1,6-hexanediol diacrylate, hollow glass microspheres, fumed silica, 1-hydroxycyclohexylphenyl ketone, diphenyl-(2,4,6-trimethylbenzoyl)phosphine oxide, phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide, and black pigment were mixed at 20°C for 110 min and then coated onto the release layer surface. The mixture was then subjected to a light intensity of 5 mw / cm². 2 The acrylic foam tape was cured under a low-pressure mercury lamp for 5 minutes to obtain the acrylic foam tape.

[0129] Example 3

[0130] This embodiment provides an acrylic foam tape and its preparation method, wherein the acrylic foam tape comprises an acrylic foam layer and a release layer arranged sequentially.

[0131] The raw materials for preparing the acrylic foam layer include the following components in parts by weight:

[0132] 81 parts of acrylic prepolymer;

[0133] 1 part isoborneol acrylate;

[0134] 10 parts of β-carboxyethyl acrylate;

[0135] 0.2 parts of 1,6-hexanediol diacrylate;

[0136] Nine portions of hollow glass microspheres;

[0137] 3 parts of fumed silica;

[0138] 0.1 parts of 1-hydroxycyclohexylphenyl ketone;

[0139] 0.05 parts of diphenyl-(2,4,6-trimethylbenzoyl)phosphine;

[0140] 0.05 parts of phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide;

[0141] 0.1 parts of black pigment.

[0142] The raw materials for preparing the acrylic acid prepolymer include the following components in parts by weight:

[0143] 65 parts of isooctyl acrylate;

[0144] 15 parts acrylic acid;

[0145] 15 parts of N,N-dimethylacrylamide;

[0146] 0.1 parts of 1-hydroxycyclohexylphenyl ketone;

[0147] 0.005 parts of n-dodecyl mercaptan.

[0148] The preparation method of the acrylic foam tape includes the following steps:

[0149] Under a nitrogen atmosphere, isooctyl acrylate, acrylic acid, N,N-dimethacrylamide, 1-hydroxycyclohexylphenyl ketone and n-dodecyl mercaptan were mixed at 30°C for 30 min, and then polymerized under a low-pressure mercury lamp to obtain the acrylic acid prepolymer. The polymerization temperature was increased to 15°C.

[0150] Acrylic prepolymer, isoborneol acrylate, β-carboxyethyl acrylate, 1,6-hexanediol diacrylate, hollow glass microspheres, fumed silica, 1-hydroxycyclohexylphenyl ketone, diphenyl-(2,4,6-trimethylbenzoyl)phosphine oxide, phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide, and black pigment were mixed at 30°C for 90 min and then coated onto the release layer surface. The mixture was then subjected to a light intensity of 10 mw / cm². 2 The acrylic foam tape was obtained by curing it under a low-pressure mercury lamp for 3 minutes.

[0151] Example 4

[0152] This embodiment provides an acrylic foam tape and its preparation method. The only difference between this embodiment and Example 1 is that acrylic acid is not added to the raw materials for preparing the acrylic prepolymer, and its reduced weight parts are allocated to N,N-dimethylacrylamide. The other components, weight parts and preparation methods are the same as in Example 1.

[0153] Example 5

[0154] This embodiment provides an acrylic foam tape and its preparation method. The only difference between this embodiment and Example 1 is that N,N-dimethylacrylamide is not added to the raw materials for preparing the acrylic prepolymer. Instead, its reduced weight parts are allocated to acrylic acid. The other components, weight parts, and preparation methods are the same as in Example 1.

[0155] Example 6

[0156] This embodiment provides an acrylic foam tape and its preparation method. The only difference between this embodiment and Example 1 is that the weight of isoborneol acrylate in the raw materials for preparing the acrylic foam layer is adjusted from 2 parts to 2.2 parts, and the weight of β-carboxyethyl acrylate is adjusted from 8 parts to 7.8 parts. The other components, weights, and preparation methods are the same as in Example 1.

[0157] Example 7

[0158] This embodiment provides an acrylic foam tape and its preparation method. The only difference between this embodiment and Example 1 is that the weight of isoborneol acrylate in the raw materials for preparing the acrylic foam layer is adjusted from 2 parts to 1.7 parts, and the weight of β-carboxyethyl acrylate is adjusted from 8 parts to 8.3 parts. The other components, weights, and preparation methods are the same as in Example 1.

[0159] Example 8

[0160] This embodiment provides an acrylic foam tape and its preparation method. The only difference between this embodiment and Example 1 is that the weight of isoborneol acrylate in the raw materials for preparing the acrylic foam layer is adjusted from 2 parts to 2.5 parts, and the weight of β-carboxyethyl acrylate is adjusted from 8 parts to 7.5 parts. The other components, weights, and preparation methods are the same as in Example 1.

[0161] Example 9

[0162] This embodiment provides an acrylic foam tape and its preparation method. The only difference between this embodiment and Example 1 is that the weight of isoborneol acrylate in the raw materials for preparing the acrylic foam layer is adjusted from 2 parts to 1.4 parts, and the weight of β-carboxyethyl acrylate is adjusted from 8 parts to 8.6 parts. The other components, weights, and preparation methods are the same as in Example 1.

[0163] Comparative Example 1

[0164] This comparative example provides an acrylic foam tape and its preparation method. The only difference between this example and Example 1 is that 1,6-hexanediol diacrylate is not added to the raw materials for preparing the acrylic foam layer. The other components, weight parts and preparation methods are the same as in Example 1.

[0165] Comparative Example 2

[0166] This comparative example provides an acrylic foam tape and its preparation method, wherein the acrylic foam tape comprises an acrylic foam layer and a release layer arranged sequentially.

[0167] The raw materials for preparing the acrylic foam layer include the following components in parts by weight:

[0168] 100 parts of acrylic prepolymer;

[0169] 8 parts acrylic acid;

[0170] 0.2 parts of 1,6-hexanediol diacrylate;

[0171] Six portions of hollow glass microspheres;

[0172] 2 parts of fumed silica;

[0173] 0.2 parts of 1-hydroxycyclohexylphenyl ketone;

[0174] 0.1 parts of diphenyl-(2,4,6-trimethylbenzoyl)phosphine;

[0175] 0.5 parts black pigment;

[0176] 0.2 parts of silane coupling agent KBM-403.

[0177] The raw materials for preparing the acrylic acid prepolymer include the following components in parts by weight:

[0178] 92 parts of isooctyl acrylate;

[0179] 8 parts acrylic acid;

[0180] 0.02 parts of 1-hydroxycyclohexylphenyl ketone;

[0181] 0.0025 parts of n-dodecyl mercaptan.

[0182] The preparation method of the acrylic foam tape is the same as that in Example 1.

[0183] The performance of the acrylic foam tapes provided in Examples 1-9 and Comparative Examples 1-2 was tested using the following methods / standards:

[0184] (1) Tensile strength: Cut acrylic foam tape into 25 mm × 75 mm strips, and test the tensile strength and fracture growth rate with a tensile testing machine with a gauge length of 25 mm;

[0185] (2) Peel strength: The peel strength of acrylic foam tape on different material surfaces was tested according to ASTM D3330 at room temperature (25℃, 72 h) and high temperature (150℃, 168 h).

[0186] (3) Static shearing: Refer to ASTM D3654 to test whether the shearing time of acrylic foam tape at room temperature (25℃, 1000 g) and high temperature (180℃, 500 g) is not less than 168 h;

[0187] (4) Dynamic shear performance: The dynamic shear strength of acrylic foam tape at 25℃ for 72 h was tested according to ASTM D1002.

[0188] (5) Pull-out strength: The pull-out strength of acrylic foam tape at 25°C for 72 h was tested according to ASTM D897.

[0189] (6) Compression recovery performance: Cut acrylic foam tape into 20mm×50mm samples, stack the samples to form a 20mm×50mm×2mm specimen, and use a press to test it. Record the compression stress of acrylic foam tape when the compression rate is 20%, 40% and 60%.

[0190] The test results are shown in Tables 1 and 2.

[0191] Table 1

[0192]

[0193] Table 2

[0194]

[0195] The test results show that:

[0196] (1) As can be seen from Examples 1 to 9, the present invention can make the acrylic foam tape with excellent high temperature resistance and good mechanical properties and compression recovery performance by combining components in specific weight parts. The acrylic foam tape provided by this invention exhibits static shear strength of no less than 168 h at both room temperature and high temperature. Its peel strength at room temperature to the interfaces of SUS, glass, and painted panels is 3.148-3.660 N / mm, 3.154-3.580 N / mm, and 3.067-3.690 N / mm, respectively; and at high temperature, the peel strength to the interfaces of SUS, glass, and painted panels is 3.484-4.350 N / mm, 3.535-4.420 N / mm, and 3.446-4.310 N / mm, respectively. Its tensile strength is 0.55-0.70 MPa, and its elongation at break is 600-750%. Its dynamic shear strength is 0.56-0.75 MPa; its pull-out strength is 0.58-0.75 MPa; and its compressive stress at compression rates of 20%, 40%, and 60% is 0.425-0.654 MPa, 1.158-2.082 MPa, and 1.158-2.082 MPa, respectively. MPa, 4.842-6.325 MPa.

[0197] (2) By comparing Example 1 with Examples 4 and 5, it can be seen that when the second hard monomer (Example 4) or the third functional monomer (Example 5) is not added to the raw materials for preparing acrylic prepolymer, the peel force of the resulting acrylic foam tape at high temperature in different interfaces is significantly reduced. At the same time, the elongation at break, dynamic shear strength and pull-out strength of the resulting acrylic foam tape are reduced, and the mechanical properties are worse. This shows that the specific combination of the second hard monomer and the third functional monomer in the acrylic prepolymer of the present invention can enable the two to play a good synergistic role, thereby improving the high temperature resistance and mechanical properties of the resulting acrylic foam tape.

[0198] (3) By comparing Examples 1 and Examples 6-9, it can be seen that the content of the first functional monomer in Example 8 is relatively low, resulting in a higher mass of the first hard monomer and the first functional monomer. This leads to an increase in the compressive stress of the resulting acrylic foam layer, a worse compression recovery performance, and a decrease in peel force and high-temperature peel force. In Example 9, the content of the first functional monomer is relatively high, resulting in a lower mass of the first hard monomer and the first functional monomer. This leads to a significant decrease in the dynamic shear strength and pull-out strength of the resulting acrylic foam layer, and a worse mechanical property. This shows that by controlling the mass ratio of the first hard monomer and the first functional monomer, the present invention can further improve the overall effect of the high-temperature resistance, compression recovery performance and mechanical properties of the resulting acrylic foam tape.

[0199] (4) By comparing Example 1 and Comparative Example 1, it can be seen that the addition of the second functional monomer in the present invention can solidify into a film. When the second functional monomer (Comparative Example 1) is missing, it cannot solidify into a film, that is, acrylic foam tape cannot be obtained.

[0200] (5) By comparing Examples 1-9 with Comparative Example 2, it can be seen that the high-temperature static shear effect of the acrylic foam tape obtained in Comparative Example 2 is not good. The high-temperature peel force at different interfaces is lower than that of Examples 1-9. Moreover, due to the excessive hardness of the adhesive layer, its elongation at break is significantly lower than that of Examples 1-9. The compressive stress is too high and the compression recovery performance is poor. This shows that the acrylic foam tape provided by the present invention has better high-temperature resistance and good elongation at break and compression recovery performance.

[0201] The applicant declares that the above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention fall within the protection and disclosure scope of the present invention.

Claims

1. An acrylic foam tape, characterized in that, The acrylic foam tape includes an acrylic foam layer and a release layer arranged sequentially. The raw materials for preparing the acrylic foam layer include the following components in parts by weight: 80-90 parts of acrylic prepolymer; 1-3 parts of the first hard monomer; 5-10 parts of the first functional monomer; Secondary functional monomer: 0.06-0.2 parts; 5-9 parts of hollow glass microspheres; 1.5-3 parts of fumed silica; 0.2-0.4 parts of the first photoinitiator; 0.1-0.5 parts of colorant.

2. The acrylic foam tape according to claim 1, characterized in that, The raw materials for preparing the acrylic prepolymer include the following components in parts by weight: 65-75 parts of the first soft monomer; 10-15 parts of the second hard monomer; 15-20 parts of the third functional monomer; 0.01-0.1 parts of the second photoinitiator; Chain transfer agent 0.001-0.005 parts.

3. The acrylic foam tape according to claim 2, characterized in that, The first soft monomer includes any one or a combination of at least two of butyl acrylate, isooctyl acrylate, 2-ethylhexyl acrylate, isodecanyl acrylate, lauryl methacrylate, or lauryl acrylate. Preferably, the second hard monomer comprises any one or a combination of at least two of methyl methacrylate, hydroxyethyl acrylate, acrylic acid or 4-hydroxybutyl acrylate and vinyl acetate; Preferably, the third functional monomer includes any one or a combination of at least two of N-hydroxymethylacrylamide, n-hexyl acrylate, hydroxyethyl methacrylate, or N,N-dimethylacrylamide; Preferably, the second photoinitiator comprises any one or a combination of at least two of 1-hydroxycyclohexylphenyl ketone, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, benzoyldimethyl ketal, or phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide; Preferably, the chain transfer agent comprises any one or a combination of at least two of thiols, thioethers, or carbon tetrachloride; Preferably, the thiol comprises dodecyl thiol.

4. The acrylic foam tape according to claim 2 or 3, characterized in that, The acrylic acid prepolymer is prepared by polymerization reaction of a first soft monomer, a second hard monomer, a third functional monomer, a second photoinitiator and a chain transfer agent; Preferably, the polymerization reaction further includes a mixing step; Preferably, the mixing temperature is 20-30°C; Preferably, the mixing time is 30-50 min; Preferably, the mixing is carried out under a protective gas atmosphere; Preferably, the protective gas includes any one or a combination of at least two of nitrogen, argon, or helium; Preferably, the polymerization reaction is carried out under a low-pressure mercury lamp; Preferably, the temperature rise range of the polymerization reaction is 15-25°C.

5. The acrylic foam tape according to any one of claims 1-4, characterized in that, The mass ratio of the first hard monomer to the first functional monomer in the raw materials for preparing the acrylic foam layer is 1:(3.5-5).

6. The acrylic foam tape according to any one of claims 1-5, characterized in that, The first hard monomer includes any one or a combination of at least two of isobornyl acrylate, acrylic acid, methyl methacrylate or dicyclopentadiene acrylate; Preferably, the first functional monomer comprises any one or a combination of at least two of isodecanyl acrylate, dodecyl 2-acrylate, β-carboxyethyl acrylate, or cyclohexylamine; Preferably, the second functional monomer comprises any one or a combination of at least two of lauryl acrylate, hydroxyethyl acrylate, 1,6-hexanediol diacrylate, or N-vinylpyrrolidone.

7. The acrylic foam tape according to any one of claims 1-6, characterized in that, The first photoinitiator includes any one or a combination of at least two of 1-hydroxycyclohexylphenyl ketone, diphenyl-(2,4,6-trimethylbenzoyl)phosphine oxide or phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide; Preferably, the first photoinitiator is selected from a combination of 1-hydroxycyclohexylphenyl ketone, diphenyl-(2,4,6-trimethylbenzoyl)phosphine oxide and phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide; Preferably, the first photoinitiator contains 0.1-0.2 parts by weight of 1-hydroxycyclohexylphenyl ketone; Preferably, the first photoinitiator contains 0.05-0.1 parts by weight of diphenyl-(2,4,6-trimethylbenzoyl)phosphine oxychloride; Preferably, the first photoinitiator contains 0.05-0.1 parts by weight of phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide.

8. A method for preparing acrylic foam tape as described in any one of claims 1-7, characterized in that, The preparation method includes the following steps: The raw materials for preparing the acrylic foam layer are mixed and coated onto the release layer, then cured to obtain the acrylic foam tape.

9. The method for preparing acrylic foam tape according to claim 8, characterized in that, The mixing time is 90-120 min; Preferably, the curing method includes performing the curing under a low-pressure mercury lamp; Preferably, the luminous intensity of the low-pressure mercury lamp is 5-10 mw / cm². 2 ; Preferably, the curing time is 3-5 minutes.

10. The application of an acrylic foam tape as described in any one of claims 1-7 in the fields of electronics, building materials, medical devices, or automobile manufacturing.

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