High-temperature-resistant masking tape and preparation method thereof

Abstract

The invention discloses a high-temperature-resistant masking tape and a preparation method thereof. The masking tape comprises a release layer, a first base material layer, a first adhesive layer, a second base material layer and a second adhesive layer which are sequentially laminated, the second adhesive layer comprises olefin polysiloxane, vinyl silicone resin, a cross-linking agent, a platinum catalyst, an anchoring agent, a physical foaming agent and a solvent; and the foaming temperature of the physical foaming agent is 150-230 DEG C. The masking tape disclosed by the invention has good insulating property, chemical resistance and fitting property; the high-temperature shielding film is suitable for the fields of electroplating, powder spraying and the like needing high-temperature shielding protection, has the characteristics of quick film tearing, no brittle failure and no adhesive residue, is adaptive to an automatic equipment film tearing process, greatly improves the production efficiency and reduces the cost.

Description

Technical Field

[0001] The invention relates to the technical field of masking tapes, and in particular to a high temperature resistant masking tape and a preparation method thereof. Background Art

[0002] When electroplating or spraying home decorations, furniture, cars, ships and other objects, it is often necessary to mask specific parts to avoid affecting the quality and appearance of the product. For example, in the spraying process, before the spraying operation, it is necessary to mask the specific parts that do not need to be sprayed. At the same time, in order to improve the performance of the spray coating, the objects to be sprayed after masking need to be acid-washed and alkaline-washed to remove the sundries and grease on the surface of the objects to be sprayed. This requires the masking tape to have good conformability and chemical resistance.

[0003] In addition, after the spraying operation, the coating is cured by baking at high temperature (above 150°C), and the final coating thickness is as high as about 400μm, and the coating is mostly epoxy resin coating. After ordinary masking tape is attached with epoxy coating, due to the high rigidity of epoxy coating, it is easy to break when the film is torn off, and after high temperature baking, ordinary pressure-sensitive adhesive is easy to have residual adhesive, which affects the appearance performance of the product after the film is torn off.

[0004] In view of the shortcomings of the existing technology, it is urgent to develop a high temperature resistant masking tape to solve the problem that the existing masking tape is easily broken when the film is torn off and there is residual adhesive after the film is torn off. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a high-temperature resistant masking tape and a preparation method thereof. Two substrate layers are used to provide reinforcement to avoid the problem of brittle fracture when the film is torn off. The bottom adhesive is a high-temperature resistant adhesive, and a high-temperature resistant physical foaming agent is added. Rapid foaming at high temperature reduces the adhesion to avoid the problem of residual adhesive when the film is torn off. At the same time, the brittle fracture when the film is torn off is further avoided by reducing the adhesion. In addition, the tape has good insulation performance, chemical resistance, and conformability, and is suitable for fields such as electroplating and powder spraying that require high-temperature (above 150°C) shielding protection.

[0006] In order to solve the above technical problems, the present invention provides a high temperature resistant masking tape, comprising a release layer, a first substrate layer, a first adhesive layer, a second substrate layer and a second adhesive layer stacked in sequence;

[0007] Wherein, the second adhesive layer comprises the following components in parts by weight:

[0008] 50-80 parts of olefin polysiloxane,

[0009] 10-40 parts of vinyl silicone resin,

[0010] 0.2-2.5 parts of cross-linking agent,

[0011] 0.5-1.5 parts of platinum catalyst,

[0012] 0.5-1.5 parts of anchoring agent,

[0013] 5-15 parts of physical foaming agent,

[0014] 100-300 parts of solvent;

[0015] The physical foaming agent has a foaming temperature of 150-230°C.

[0016] The present invention adopts a double-layer substrate composite structure of a first substrate layer and a second substrate layer, and the two are bonded together by a first adhesive layer. The first substrate layer is a substrate layer of a coating such as electroplating or powder spraying, and this layer is prone to embrittlement. The second substrate layer is a reinforcement layer, which plays a role in rapid film tearing without brittle breakage. The two layers of substrate have a reinforcement effect, avoiding the problem of brittle breakage when tearing the film.

[0017] A high-temperature resistant physical foaming agent with a foaming temperature of 150-230°C is added to the second adhesive layer of the bottom layer. When the coating is baked at high temperature, the foaming agent foams quickly to reduce adhesion and avoid residual glue when the film is torn off. At the same time, the reduced adhesion can further avoid the phenomenon of brittle breakage when the film is torn off. The tape has good insulation properties, chemical resistance, and conformability, and is suitable for fields that require high-temperature shielding protection, such as electroplating and powder coating.

[0018] Furthermore, the physical foaming agent is a microsphere foaming agent with a core-shell structure, wherein the shell layer is a thermoplastic acrylic resin polymer and the core layer is an alkane gas.

[0019] Furthermore, the particle size of the physical foaming agent is 2-30 μm.

[0020] Furthermore, the vinyl content of the olefin polysiloxane is 0.05%-0.5%, and the weight average molecular weight is 100,000-300,000;

[0021] And / or, the vinyl content in the vinyl silicone resin is 0.5% to 2.0%.

[0022] Further, the cross-linking agent is a side-end hydrogen-containing silicone oil, and its hydrogen content is 0.05% to 1.0%;

[0023] And / or, the catalyst is a platinum catalyst, such as platinum catalyst DC-4000, including but not limited to this.

[0024] Furthermore, the anchoring agent is anchoring agent KL-298, including but not limited to this.

[0025] Furthermore, the solvent is toluene and / or ethyl acetate, including but not limited to these.

[0026] Furthermore, the release layer includes one or more of an organic silicon release agent, a fluorine release agent, and a non-silicon release agent;

[0027] And / or, the release layer has a thickness of 0.1-1 μm.

[0028] Furthermore, the non-silicone release agent is polyethylene octadecyl urethane, including but not limited to this.

[0029] Furthermore, the first substrate layer and the second substrate layer are independently selected from one or more of a polyester film, a polyimide (PI) film, and a polyolefin polymer film;

[0030] And / or, the thickness of the first substrate layer and the second substrate layer are independently 5-75 μm.

[0031] Furthermore, the polyester film is a polyethylene terephthalate (PET) film, including but not limited to this.

[0032] Furthermore, the polyolefin polymer film is a polypropylene (PP) film or a polyethylene (PE) film, including but not limited to these.

[0033] Furthermore, the first adhesive layer includes a pressure-sensitive adhesive or a hot-melt adhesive;

[0034] And / or, the thickness of the first adhesive layer is 5-50 μm.

[0035] Furthermore, the pressure-sensitive adhesive is one or more of an acrylic pressure-sensitive adhesive, a silicone pressure-sensitive adhesive, and a rubber pressure-sensitive adhesive; the hot-melt adhesive is one or more of a polyester hot-melt adhesive, an EVA (ethylene-vinyl acetate copolymer) hot-melt adhesive, a POE (polyolefin elastomer) hot-melt adhesive, and a polyurethane hot-melt adhesive.

[0036] The second aspect of the present invention provides a method for preparing the high temperature resistant masking tape according to the first aspect, comprising the following steps:

[0037] S1, coating a release layer on one side of the first substrate layer, and coating a first adhesive layer on the other side;

[0038] S2, laminating the second substrate layer on the first adhesive layer of the first substrate layer;

[0039] S3, coating a second adhesive layer on the second substrate layer, and rolling up to obtain the masking tape.

[0040] Beneficial effects of the present invention:

[0041] The present invention adopts a double-layer substrate composite structure, and the two are bonded together by a first adhesive layer. The first substrate layer is a substrate layer of a coating such as electroplating or powder spraying, which is prone to brittleness. The second substrate layer is a reinforcement layer, which plays a role in rapid film tearing without brittle breakage. The two layers of substrate have a reinforcement effect, avoiding the problem of brittle breakage when tearing the film.

[0042] The present invention adds a high-temperature resistant physical foaming agent with a foaming temperature of 150-230°C to the second adhesive layer of the bottom layer. When the coating is baked at a high temperature (greater than 150°C), the foaming agent foams quickly to reduce adhesion, thereby avoiding residual adhesive when the film is torn off; at the same time, the reduced adhesion can further avoid the phenomenon of brittle breakage when the film is torn off.

[0043] The masking tape of the present invention has good insulation performance, chemical resistance and conformability, is suitable for fields requiring high-temperature shielding protection such as electroplating and powder spraying, and is compatible with the film-tearing process of automated equipment, greatly improving production efficiency and reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0045] Figure 1 It is a schematic structural diagram of the high temperature resistant masking tape of the present invention;

[0046] Explanation of the numbers in the figure: 1, release layer, 2, first substrate layer, 3, first adhesive layer, 4, second substrate layer, 5, second adhesive layer. DETAILED DESCRIPTION

[0047] The technical solution of the present invention will be described clearly and completely below in conjunction with the specific embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] Reference Figure 1 As shown, this embodiment provides a high temperature resistant masking tape, comprising a release layer 1, a first substrate layer 2, a first adhesive layer 3, a second substrate layer 4 and a second adhesive layer 5 which are sequentially stacked.

[0049] As a preferred embodiment, the second adhesive layer includes the following components in parts by weight: 50-80 parts of olefin polysiloxane, such as 50 parts, 60 parts, 70 parts, 80 parts, etc., including but not limited to these; 10-40 parts of vinyl silicone resin, such as 10 parts, 20 parts, 30 parts, 40 parts, etc., including but not limited to these; 0.2-2.5 parts of cross-linking agent, such as 0.2 parts, 0.5 parts, 1 parts, 1.5 parts, 2 parts, 2.5 parts, etc., including but not limited to these; 0.5 -1.5 parts of platinum catalyst, such as 0.5 parts, 1 parts, 1.5 parts, etc., including but not limited to this; 0.5-1.5 parts of anchoring agent, such as 0.5 parts, 1 parts, 1.5 parts, etc., including but not limited to this; 5-15 parts of physical foaming agent, such as 5 parts, 7.5 parts, 10 parts, 12.5 parts, 15 parts, etc., including but not limited to this; 100-300 parts of solvent; such as 100 parts, 150 parts, 200 parts, 250 parts, 300 parts, etc., including but not limited to this.

[0050] As a specific example, the foaming temperature of the physical foaming agent is 150-230°C; the physical foaming agent is a microsphere foaming agent with a core-shell structure, wherein the shell layer is a thermoplastic acrylic resin polymer and the core layer is an alkane gas; the particle size of the physical foaming agent is 2-30μm, for example 2μm, 5μm, 10μm, 15μm, 20μm, 25μm, 30μm, etc., including but not limited to these.

[0051] As a specific example, the vinyl content in the olefin polysiloxane is 0.05%-0.5%, and the weight-average molecular weight is 100,000-300,000; the vinyl content in the vinyl silicone resin is 0.5%~2.0%; the cross-linking agent is side-end hydrogenated silicone oil, and its hydrogen content is 0.05%~1.0%; the catalyst is a platinum catalyst, such as platinum catalyst DC-4000, including but not limited to this; the anchoring agent is anchoring agent KL-298, including but not limited to this; the solvent is toluene and / or ethyl acetate, including but not limited to this.

[0052] As a specific example, the release layer includes one or more of a silicone release agent, a fluorine release agent, and a non-silicone release agent. The non-silicone release agent is polyethylene octadecyl urethane, including but not limited to this. The thickness of the release layer is 0.1-1 μm.

[0053] As a specific example, the first substrate layer and the second substrate layer are independently selected from one or more of polyester film, PI film, and polyolefin polymer film; the polyester film is a PET film, including but not limited to these; the polyolefin polymer film is a PP film or a PE film, including but not limited to these; the thickness of the first substrate layer and the second substrate layer is independently 5-75μm.

[0054] As a specific example, the first adhesive layer includes a pressure-sensitive adhesive or a hot melt adhesive. The pressure-sensitive adhesive is one or more of an acrylic pressure-sensitive adhesive, a silicone pressure-sensitive adhesive, and a rubber pressure-sensitive adhesive; the hot melt adhesive is one or more of a polyester hot melt adhesive, an EVA (ethylene-vinyl acetate copolymer) hot melt adhesive, a POE (polyolefin elastomer) hot melt adhesive, and a polyurethane hot melt adhesive. The thickness of the first adhesive layer is 5-50 μm.

[0055] Another embodiment provides a method for preparing the high temperature resistant masking tape described in the above embodiment, comprising the following steps:

[0056] S1, coating a release layer on one side of the first substrate layer, and coating a first adhesive layer on the other side;

[0057] S2, laminating the second substrate layer on the first adhesive layer of the first substrate layer;

[0058] S3, coating a second adhesive layer on the second substrate layer, and rolling up to obtain the masking tape.

[0059] The present invention adopts a double-layer substrate composite structure of a first substrate layer and a second substrate layer, and the two are bonded by a first adhesive layer. The first substrate layer is a substrate layer of a coating such as electroplating or powder spraying, and this layer is prone to brittleness. The second substrate layer is a reinforcement layer, which plays a role in rapid film tearing without brittle fracture. The two layers of substrate have a reinforcement effect, avoiding the problem of brittle fracture when the film is torn. A high-temperature resistant physical foaming agent with a foaming temperature of 150-230°C is added to the second adhesive layer of the bottom layer. When the coating is baked at high temperature, the foaming agent foams quickly to reduce adhesion, avoiding residual glue when the film is torn; at the same time, the reduced adhesion can further avoid the phenomenon of brittle fracture when the film is torn; the tape has good insulation performance, chemical resistance, and compliant performance, and is suitable for fields such as electroplating and powder spraying that require high-temperature shielding protection.

[0060] The following are specific embodiments.

[0061] Example 1

[0062] This embodiment relates to a high temperature resistant masking tape, comprising a release layer with a thickness of less than 500 nm, a PET film with a thickness of 25 μm, a first adhesive layer with a thickness of 15 μm, a PET film with a thickness of 25 μm and a second adhesive layer with a thickness of 25 μm, which are sequentially stacked.

[0063] The material of the release layer is the silicone release agent Dow Corning 7458, and the material of the first adhesive layer is the acrylic pressure-sensitive adhesive Anzo Chemical Y-1411.

[0064] In parts by weight, the components of the second adhesive layer include 65 parts of olefin polysiloxane, 35 parts of vinyl silicone resin, 1 part of cross-linking agent, 1 part of platinum catalyst DC 4000, 1 part of anchoring agent KL-298, 7.5 parts of physical foaming agent, 125 parts of toluene, and 125 parts of ethyl acetate; wherein the olefin polysiloxane is vinyl polysiloxane with a vinyl content of 0.05%~0.5% and a molecular weight of 100,000-300,000; the vinyl silicone resin is vinyl MQ silicone resin with a vinyl content of 0.1%~2.0%; the cross-linking agent is side-end hydrogenated silicone oil with a hydrogen content of 0.05%~1.0%; the physical foaming agent is a core-shell structure with a particle size of 2-30μm, the shell layer is a thermoplastic acrylic resin polymer, and the core layer is an alkane gas.

[0065] The coating liquid preparation method of the second adhesive layer is as follows: olefin polysiloxane and toluene are added to a stirring kettle in sequence, mechanically stirred for 60 minutes, ethyl acetate is added after sufficient dispersion, vinyl silicone resin, physical foaming agent, hydrogen-containing silicone oil crosslinking agent, and anchoring agent are added in sequence, mechanically stirred at high speed for 30 minutes, a platinum catalyst is added, and stirring is continued for 30 minutes to obtain a coating liquid.

[0066] Example 2

[0067] This embodiment relates to a high temperature resistant masking tape, comprising a release layer with a thickness of less than 500 nm, a PET film with a thickness of 25 μm, a first adhesive layer with a thickness of 15 μm, a PET film with a thickness of 25 μm and a second adhesive layer with a thickness of 25 μm, which are sequentially stacked.

[0068] The material of the release layer is the silicone release agent Dow Corning 7458, and the material of the first adhesive layer is the acrylic pressure-sensitive adhesive Anzo Chemical Y-1411.

[0069] In parts by weight, the components of the second adhesive layer include 65 parts of olefin polysiloxane, 35 parts of vinyl silicone resin, 1 part of cross-linking agent, 1 part of platinum catalyst DC 4000, 1 part of anchoring agent KL-298, 15 parts of physical foaming agent, 125 parts of toluene, and 125 parts of ethyl acetate; wherein the olefin polysiloxane is vinyl polysiloxane with a vinyl content of 0.05%~0.5% and a molecular weight of 100,000-300,000; the vinyl silicone resin is vinyl MQ silicone resin with a vinyl content of 0.1%~2.0%; the cross-linking agent is side-end hydrogenated silicone oil with a hydrogen content of 0.05%~1.0%; the physical foaming agent is a core-shell structure with a particle size of 2-30μm, the shell layer is a thermoplastic acrylic resin polymer, and the core layer is an alkane gas.

[0070] The coating liquid preparation method of the second adhesive layer is as follows: olefin polysiloxane and toluene are added to a stirring kettle in sequence, mechanically stirred for 60 minutes, ethyl acetate is added after sufficient dispersion, vinyl silicone resin, physical foaming agent, hydrogen-containing silicone oil crosslinking agent, and anchoring agent are added in sequence, mechanically stirred at high speed for 30 minutes, a platinum catalyst is added, and stirring is continued for 30 minutes to obtain a coating liquid.

[0071] Comparative Example 1

[0072] The comparative example relates to a masking tape, comprising a release layer with a thickness of less than 500 nm, a PET film with a thickness of 25 μm, a first adhesive layer with a thickness of 15 μm, a PET film with a thickness of 25 μm and a second adhesive layer with a thickness of 25 μm, which are sequentially laminated.

[0073] The material of the release layer is the silicone release agent Dow Corning 7458, and the material of the first adhesive layer is the acrylic pressure-sensitive adhesive Anzo Chemical Y-1411.

[0074] In parts by weight, the components of the second adhesive layer include 65 parts of olefin polysiloxane, 35 parts of vinyl silicone resin, 1 part of cross-linking agent, 1 part of platinum catalyst DC 4000, 1 part of anchoring agent KL-298, 3 parts of physical foaming agent, 125 parts of toluene, and 125 parts of ethyl acetate; wherein the olefin polysiloxane is vinyl polysiloxane with a vinyl content of 0.05%~0.5% and a molecular weight of 100,000-300,000; the vinyl silicone resin is vinyl MQ silicone resin with a vinyl content of 0.1%~2.0%; the cross-linking agent is side-end hydrogenated silicone oil with a hydrogen content of 0.05%~1.0%; the physical foaming agent is a core-shell structure with a particle size of 2-30μm, the shell layer is a thermoplastic acrylic resin polymer, and the core layer is an alkane gas.

[0075] The coating liquid preparation method of the second adhesive layer is as follows: olefin polysiloxane and toluene are added to a stirring kettle in sequence, mechanically stirred for 60 minutes, ethyl acetate is added after sufficient dispersion, vinyl silicone resin, physical foaming agent, hydrogen-containing silicone oil crosslinking agent, and anchoring agent are added in sequence, mechanically stirred at high speed for 30 minutes, a platinum catalyst is added, and stirring is continued for 30 minutes to obtain a coating liquid.

[0076] Comparative Example 2

[0077] The comparative example relates to a masking tape, comprising a release layer with a thickness of less than 500 nm, a PET film with a thickness of 25 μm, a first adhesive layer with a thickness of 15 μm, a PET film with a thickness of 25 μm and a second adhesive layer with a thickness of 25 μm, which are sequentially laminated.

[0078] The material of the release layer is the silicone release agent Dow Corning 7458, and the material of the first adhesive layer is the acrylic pressure-sensitive adhesive Anzo Chemical Y-1411.

[0079] In parts by weight, the components of the second adhesive layer include 65 parts of olefin polysiloxane, 35 parts of vinyl silicone resin, 1 part of cross-linking agent, 1 part of platinum catalyst DC 4000, 0 parts of anchoring agent KL-298, 15 parts of physical foaming agent, 125 parts of toluene, and 125 parts of ethyl acetate; wherein the olefin polysiloxane is vinyl polysiloxane with a vinyl content of 0.05%~0.5% and a molecular weight of 100,000-300,000; the vinyl silicone resin is vinyl MQ silicone resin with a vinyl content of 0.1%~2.0%; the cross-linking agent is side-end hydrogenated silicone oil with a hydrogen content of 0.05%~1.0%; the physical foaming agent is a core-shell structure with a particle size of 2-30μm, the shell layer is a thermoplastic acrylic resin polymer, and the core layer is an alkane gas.

[0080] The coating liquid preparation method of the second adhesive layer is as follows: olefin polysiloxane and toluene are added to a stirring kettle in sequence, mechanically stirred for 60 minutes, ethyl acetate is added after sufficient dispersion, vinyl silicone resin, physical foaming agent, hydrogen-containing silicone oil crosslinking agent, and anchoring agent are added in sequence, mechanically stirred at high speed for 30 minutes, a platinum catalyst is added, and stirring is continued for 30 minutes to obtain a coating liquid.

[0081] Comparative Example 3

[0082] The comparative example is a conventional masking tape, comprising a release layer with a thickness of less than 500 nm, a PET film with a thickness of 25 μm, and an adhesive layer with a thickness of 25 μm, wherein the release layer is made of an organic silicone release agent, and the adhesive layer is made of an acrylic pressure-sensitive adhesive.

[0083] Test Case

[0084] The masking tapes of the embodiments and comparative examples were subjected to performance tests, and the test items included room temperature adhesion, high temperature adhesion, whether brittle fracture occurred when the film was quickly torn off, and whether residual adhesive occurred when the film was quickly torn off. The test results are shown in Table 1. The specific test method is as follows:

[0085] Room temperature adhesion: Cut the tape into strips with a width of 25 mm, and use a 2 kg weight to attach the tape to a SUS standard test specimen. After placing it in a standard environment (23 ± 2 ° C, 55 ± 5% RH) for 20 minutes, use a tensile test machine to test the 180° peel strength of the tape at a tensile speed of 300 mm / min.

[0086] High temperature adhesion: Cut the sample strip to a width of 25mm, use a 2Kg weight to stick the tape to the SUS standard test specimen, place it at 200℃ for 15min, take it out and let it stand at room temperature for 2h, then use a tensile machine to test the 180° peel strength of the tape at a tensile speed of 300mm / min.

[0087] Whether brittle breakage and residual glue occur when tearing off the film quickly: cut the sample strips with a width of 22mm*length of 2m, stick them on the aluminum plate, use electrostatic spray epoxy coating with a thickness of 200-250μm, put them in a 200℃ curing furnace to cure for 15min, take them out and let them stand for 2h, and tear off the film quickly at a tearing speed of 30m / min to observe whether brittle breakage and residual glue occur.

[0088] Table 1

[0089] It can be seen from Table 1 that the masking tapes prepared in Examples 1-2 of the present invention have good adhesion at room temperature, which is convenient for firm bonding with the object to be processed. The adhesion decreases significantly after high temperature, which is convenient for rapid film tearing, and there is no brittle breakage or residual glue when the film is quickly torn off. From the comparison between Example 1 and Comparative Example 1, it can be seen that when the content of the physical foaming agent is relatively small, the adhesion cannot be effectively reduced during high-temperature treatment, and the problem of residual glue occurs when the film is quickly torn off. From the comparison between Example 1 and Comparative Example 2, it can be seen that when no anchoring agent is added, due to the low adhesion between the second adhesive layer and the second substrate layer, the problem of residual glue is prone to occur when the film is quickly torn off. The conventional masking tape in Comparative Example 3 uses a single-layer substrate layer, which is prone to brittle breakage when the film is quickly torn off, and the adhesive layer has no physical foaming agent added, and the adhesion is high, so the problem of residual glue is prone to occur when the film is quickly torn off.

[0090] The present invention has been described in detail above in conjunction with specific implementations and exemplary examples, but these descriptions cannot be understood as limiting the present invention. Those skilled in the art understand that, without departing from the spirit and scope of the present invention, a variety of equivalent substitutions, modifications or improvements may be made to the technical solution of the present invention and its implementation methods, all of which fall within the scope of the present invention. The scope of protection of the present invention shall be subject to the attached claims.

Claims

1. A high temperature resistant masking tape, characterized in that: It comprises a release layer, a first substrate layer, a first adhesive layer, a second substrate layer and a second adhesive layer which are sequentially stacked; Wherein, the second adhesive layer comprises the following components in parts by weight: 50-80 parts of olefin polysiloxane, 10-40 parts of vinyl silicone resin, 0.2-2.5 parts of cross-linking agent, 0.5-1.5 parts of platinum catalyst, 0.5-1.5 parts of anchoring agent, 5-15 parts of physical foaming agent, 100-300 parts of solvent; The physical foaming agent has a foaming temperature of 150-230°C.

2. The high temperature resistant masking tape according to claim 1, characterized in that: The physical foaming agent is a microsphere foaming agent with a core-shell structure, wherein the shell layer is a thermoplastic acrylic resin polymer and the core layer is an alkane gas.

3. The high temperature resistant masking tape according to claim 2, characterized in that: The particle size of the physical foaming agent is 2-30 μm.

4. The high temperature resistant masking tape according to claim 1, characterized in that: The vinyl content of the olefin polysiloxane is 0.05%-0.5%, and the weight average molecular weight is 100,000-300,000; And / or, the vinyl content in the vinyl silicone resin is 0.5% to 2.0%.

5. The high temperature resistant masking tape according to claim 1, characterized in that: The cross-linking agent is a side-end hydrogen-containing silicone oil, and its hydrogen content is 0.05% to 1.0%; And / or, the catalyst is a platinum catalyst.

6. The high temperature resistant masking tape according to claim 1, characterized in that: The release layer includes one or more of an organic silicon release agent, a fluorine release agent, and a non-silicon release agent; And / or, the release layer has a thickness of 0.1-1 μm.

7. The high temperature resistant masking tape according to claim 1, characterized in that: The first substrate layer and the second substrate layer are independently selected from one or more of a polyester film, a polyimide film, and a polyolefin polymer film; And / or, the thickness of the first substrate layer and the second substrate layer are independently 5-75 μm.

8. The high temperature resistant masking tape according to claim 1, characterized in that: The first adhesive layer includes a pressure-sensitive adhesive or a hot-melt adhesive; And / or, the thickness of the first adhesive layer is 5-50 μm.

9. The high temperature resistant masking tape according to claim 8, characterized in that: The pressure-sensitive adhesive is one or more of an acrylic pressure-sensitive adhesive, a silicone pressure-sensitive adhesive, and a rubber pressure-sensitive adhesive; the hot-melt adhesive is one or more of a polyester hot-melt adhesive, an EVA hot-melt adhesive, a POE hot-melt adhesive, and a polyurethane hot-melt adhesive.

10. A method for preparing the high temperature resistant masking tape according to any one of claims 1 to 9, characterized in that: The steps include: S1, coating a release layer on one side of the first substrate layer, and coating a first adhesive layer on the other side; S2, laminating the second substrate layer on the first adhesive layer of the first substrate layer; S3, coating a second adhesive layer on the second substrate layer, and rolling up to obtain the masking tape.

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