A pressure-sensitive adhesive paper containing a heat-sensitive coating and a silicone release agent

Abstract

The invention discloses a pressure-sensitive adhesive paper containing a heat-sensitive coating and an organosilicon release agent, and belongs to the technical field of pressure-sensitive adhesive paper. It includes base paper, a heat-sensitive coating, an organosilicon release agent and a pressure-sensitive adhesive; tripropylene glycol diacrylate, vinyl polydimethylsiloxane, tert-butyl vinyl carbonate, triphenylsulfonium hexafluoride phosphite, polyethylene glycol, polyoxyethylene castor oil, phytic acid, and KH550 are mixed to obtain the organosilicon release agent; acrylic resin, dimethylbenzene, butyl ester, 2,2-bis(4-hydroxyphenyl)propane, 1,1,3-tris(2-methyl-4-hydroxy-5-tert-butylphenyl)butane, 2-phenylamino-3-methyl-6-dibutylaminofluoran, 1,2-diphenoxyethane, OP-10, gul gum, zinc chloride, and β-hydroxyalkylamide are mixed to obtain a color layer liquid; an impermeable film is formed by the organosilicon release agent and the color layer liquid to prevent the penetration of organosilicon, thereby improving the release effect of the adhesive paper.

Description

Technical Field

[0001] The invention belongs to the technical field of pressure-sensitive adhesive paper, and in particular relates to a pressure-sensitive adhesive paper containing a heat-sensitive coating and an organic silicon release agent. Background Art

[0002] Release paper, also known as isolation paper or anti-stick paper, is a kind of anti-stick paper that can prevent pressure-sensitive adhesive from sticking and protect it from contamination. It is widely used in electronic products, automotive foam, packaging industry, advertising, printing and other fields. There are many release papers on the market, and most of them are made by coating a thermosetting release emulsion or a self-drying release agent on the paper. Silicone release paper is a paper product with a special surface treatment. Its production process is to cover a single side surface of ordinary base paper with a layer of heat-sensitive film, and then coat a layer of silicone film on the outside of the heat-sensitive film. This design is designed to effectively separate paper from other surfaces, so that the coating (such as adhesives, inks, etc.) can be easily peeled off from the paper without affecting its surface quality. However, silicone has a certain permeability and will penetrate into the base paper, causing poor curing, affecting the structural stability of the paper, and making it difficult to peel off. Summary of the invention

[0003] The invention discloses a pressure-sensitive adhesive paper containing a heat-sensitive coating and an organosilicon release agent, and belongs to the technical field of pressure-sensitive adhesive paper. The invention comprises base paper, a heat-sensitive coating, an organosilicon release agent and a pressure-sensitive adhesive; tripropylene glycol diacrylate, vinyl polydimethylsiloxane, tert-butylethylene carbonate, triphenylsulfonium hexafluoride phosphite, polyethylene glycol, polyoxyethylene castor oil, phytic acid and KH550 are mixed to obtain the organosilicon release agent; acrylic resin, xylene, butyl ester, 2,2-bis(4-hydroxyphenyl)propane, 1,1,3-tris(2-methyl-4-hydroxy-5-tert-butylphenyl)butane, 2-phenylamino-3-methyl-6-dibutylaminofluoran, 1,2-diphenoxyethane, OP-10, gul gum, zinc chloride and β-hydroxyalkylamide are mixed to obtain a color-forming layer liquid; an impermeable film is formed by the organosilicon release agent and the color-forming layer liquid to prevent the penetration of organosilicon, thereby improving the release effect of the adhesive paper.

[0004] The technical problem to be solved by the present invention is to improve the release effect of pressure-sensitive adhesive paper.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A pressure-sensitive adhesive paper containing a heat-sensitive coating and an organosilicon release agent comprises base paper, a heat-sensitive coating, an organosilicon release agent and a pressure-sensitive adhesive; the heat-sensitive coating is coated on one side of the base paper, the pressure-sensitive adhesive is coated on the other side of the base paper, and the organosilicon release agent is coated on the side of the heat-sensitive coating away from the base paper.

[0007] As a preferred technical solution of the present invention, the heat-sensitive coating comprises a base liquid and a chromogenic layer liquid, the base liquid is coated on the surface of the base paper, and the chromogenic layer liquid is coated on the surface of the base liquid; the coating amount of the base liquid is 8-15g / m 2 The coating amount of the color-forming layer liquid is 2-8 g / m 2 .

[0008] As a preferred technical solution of the present invention, the preparation of the pressure-sensitive adhesive comprises the following steps:

[0009] S1, tetrahydrofurfuryl methacrylate, rosin acrylate, lauryl methacrylate, acrylic acid, and ethyl acetate are placed in a reaction kettle, heated to 75-80° C. in a nitrogen atmosphere, and azobisisobutyronitrile is added, and reacted for 3-4 hours to obtain material A;

[0010] S2. Mix the material A, triethylene glycol diacrylate and 2-hydroxy-2-methylpropiophenone, stir for 2-3 hours, apply, light cure and dry to obtain the pressure-sensitive adhesive.

[0011] As a preferred technical solution of the present invention, in step S1, the mass ratio of tetrahydrofurfuryl methacrylate, rosin acrylate, lauryl methacrylate, acrylic acid, ethyl acetate, and azobisisobutyronitrile is 10-12:10-12:35-45:1-2:7-8:0.5-0.8.

[0012] As a preferred technical solution of the present invention, in step S2, the mass ratio of material A, triethylene glycol diacrylate, and 2-hydroxy-2-methylpropiophenone is 10-15:2-3:0.15-0.25.

[0013] As a preferred technical solution of the present invention, the preparation of the silicone release agent comprises the following steps:

[0014] Take tripropylene glycol diacrylate, vinyl polydimethylsiloxane, versatate, triphenylsulfonium phosphine hexafluoride, polyethylene glycol, and polyoxyethylene castor oil, mix them, stir for 1-2 hours, add fumed silica, stir for 20-30 minutes, add phytic acid and KH550, and continue stirring for 1-2 hours to obtain the silicone release agent.

[0015] As a preferred technical solution of the present invention, the mass ratio of tripropylene glycol diacrylate, vinyl polydimethylsiloxane, versatate, triphenylsulfonium phosphine hexafluoride, polyethylene glycol, polyoxyethylene castor oil, fumed silica, phytic acid, and KH550 is 10-20:40-50:20-35:1-2:100:2-3:30-40:30-40:1-2.

[0016] As a preferred technical solution of the present invention, the preparation of the bottom layer liquid comprises the following steps:

[0017] Take calcined kaolin, light calcium carbonate and polyvinyl alcohol and mix them, stir for 2-3 hours to obtain a bottom layer liquid;

[0018] The mass ratio of the calcined kaolin, light calcium carbonate and polyvinyl alcohol is 60-65:20-35:10-12.

[0019] As a preferred technical solution of the present invention, the preparation of the chromogenic layer liquid comprises the following steps:

[0020] Take acrylic resin, xylene, and butyl ester, mix them, stir for 2-3 hours, add 2,2-bis(4-hydroxyphenyl)propane, 1,1,3-tris(2-methyl-4-hydroxy-5-tert-butylphenyl)butane, 2-phenylamino-3-methyl-6-dibutylaminofluoran, 1,2-diphenoxyethane, OP-10, Gul gum, zinc chloride, and β-hydroxyalkylamide, mix them, stir for 4-6 hours, and obtain a color-forming layer liquid;

[0021] The mass ratio of the acrylic resin, xylene, butyl ester, 2,2-bis(4-hydroxyphenyl)propane, 1,1,3-tris(2-methyl-4-hydroxy-5-tert-butylphenyl)butane, 2-phenylamino-3-methyl-6-dibutylaminofluoran, 1,2-diphenoxyethane, OP-10, gul gum, zinc chloride and beta-hydroxyalkylamide is 20-30:40-50:30-40:20-30:20-25:10-12:10-12:30-40:20-30:8-10:6-8.

[0022] Beneficial effects of the present invention:

[0023] In a pressure-sensitive adhesive tape containing a heat-sensitive coating and a silicone release agent disclosed in the present invention, phytic acid, on the one hand, forms a dense film through a cross-linking reaction with a silane coupling agent, and covers the surface of the heat-sensitive coating to prevent silicone penetration; on the other hand, phytic acid chelates with zinc ions to form support sites, thereby enhancing the structural stability of the film, preventing it from sinking or falling off, and improving the coverage stability of the film, thereby preventing silicone from penetrating into the base paper, avoiding poor curing, and difficulty in peeling. DETAILED DESCRIPTION

[0024] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are described in detail below in combination with the embodiments.

[0025] Example 1

[0026] A pressure-sensitive adhesive paper containing a heat-sensitive coating and an organosilicon release agent comprises base paper, a heat-sensitive coating, an organosilicon release agent and a pressure-sensitive adhesive; the heat-sensitive coating is coated on one side of the base paper, the pressure-sensitive adhesive is coated on the other side of the base paper, and the organosilicon release agent is coated on the side of the heat-sensitive coating away from the base paper.

[0027] The heat-sensitive coating includes a bottom layer liquid and a color-forming layer liquid. The bottom layer liquid is coated on the surface of the base paper, and the color-forming layer liquid is coated on the surface of the bottom layer liquid. The coating amount of the bottom layer liquid is 8 g / m 2 The coating amount of the color-forming layer liquid is 2 g / m 2 .

[0028] The preparation of the bottom layer liquid comprises the following steps:

[0029] Calcined kaolin, light calcium carbonate and polyvinyl alcohol are mixed and stirred for 2 hours to obtain a bottom liquid; the mass ratio of the calcined kaolin, light calcium carbonate and polyvinyl alcohol is 60:20:10.

[0030] The preparation of the chromogenic layer liquid comprises the following steps:

[0031] Acrylic resin, xylene and butyl ester were mixed and stirred for 2 hours, and 2,2-bis(4-hydroxyphenyl)propane, 1,1,3-tris(2-methyl-4-hydroxy-5-tert-butylphenyl)butane, 2-phenylamino-3-methyl-6-dibutylaminofluoran, 1,2-diphenoxyethane, OP-10, Gul gum, zinc chloride and β-hydroxyalkylamide were added and mixed, and stirred for 4 hours to obtain a color-forming layer liquid;

[0032] The mass ratio of the acrylic resin, xylene, butyl ester, 2,2-bis(4-hydroxyphenyl)propane, 1,1,3-tris(2-methyl-4-hydroxy-5-tert-butylphenyl)butane, 2-phenylamino-3-methyl-6-dibutylaminofluoran, 1,2-diphenoxyethane, OP-10, gul gum, zinc chloride and beta-hydroxyalkylamide is 20:40:30:20:20:10:10:30:20:8:6.

[0033] The preparation of the pressure-sensitive adhesive comprises the following steps:

[0034] S1. Tetrahydrofurfuryl methacrylate, rosin acrylate, lauryl methacrylate, acrylic acid, and ethyl acetate are placed in a reaction kettle, heated to 75° C. in a nitrogen atmosphere, and azobisisobutyronitrile is added. The reaction is carried out for 3 hours to obtain material A; the mass ratio of tetrahydrofurfuryl methacrylate, rosin acrylate, lauryl methacrylate, acrylic acid, ethyl acetate, and azobisisobutyronitrile is 10:10:35:1:7:0.5;

[0035] S2. Mix the material A, triethylene glycol diacrylate and 2-hydroxy-2-methylpropiophenone, stir for 2 hours, apply, photocure and dry to obtain the pressure-sensitive adhesive; the mass ratio of the material A, triethylene glycol diacrylate and 2-hydroxy-2-methylpropiophenone is 10:2:0.15.

[0036] The preparation of the silicone release agent comprises the following steps:

[0037] Take tripropylene glycol diacrylate, vinyl polydimethylsiloxane, versatate, triphenylsulfonium phosphonium hexafluoride, polyethylene glycol, and polyoxyethylene castor oil, mix them, stir for 1 hour, add fumed silica, stir for 20 minutes, add phytic acid and KH550, and continue stirring for 1 hour to obtain the silicone release agent; the mass ratio of tripropylene glycol diacrylate, vinyl polydimethylsiloxane, versatate, triphenylsulfonium phosphonium hexafluoride, polyethylene glycol, polyoxyethylene castor oil, fumed silica, phytic acid, and KH550 is 10:40:20:1:100:2:30:30:1.

[0038] Example 2

[0039] A pressure-sensitive adhesive paper containing a heat-sensitive coating and an organosilicon release agent comprises base paper, a heat-sensitive coating, an organosilicon release agent and a pressure-sensitive adhesive; the heat-sensitive coating is coated on one side of the base paper, the pressure-sensitive adhesive is coated on the other side of the base paper, and the organosilicon release agent is coated on the side of the heat-sensitive coating away from the base paper.

[0040] The thermosensitive coating includes a bottom layer liquid and a color-forming layer liquid, the bottom layer liquid is coated on the surface of the base paper, and the color-forming layer liquid is coated on the surface of the bottom layer liquid; the coating amount of the bottom layer liquid is 12g / m 2 The coating amount of the color-forming layer liquid is 5 g / m 2 .

[0041] The preparation of the bottom layer liquid comprises the following steps:

[0042] Calcined kaolin, light calcium carbonate and polyvinyl alcohol were mixed and stirred for 2.5 hours to obtain a bottom liquid; the mass ratio of the calcined kaolin, light calcium carbonate and polyvinyl alcohol was 63:28:11.

[0043] The preparation of the chromogenic layer liquid comprises the following steps:

[0044] Acrylic resin, xylene and butyl ester were mixed and stirred for 2.5 hours, and 2,2-bis(4-hydroxyphenyl)propane, 1,1,3-tris(2-methyl-4-hydroxy-5-tert-butylphenyl)butane, 2-phenylamino-3-methyl-6-dibutylaminofluoran, 1,2-diphenoxyethane, OP-10, Gul gum, zinc chloride and β-hydroxyalkylamide were added and mixed, and stirred for 5 hours to obtain a color-forming layer liquid;

[0045] The mass ratio of the acrylic resin, xylene, butyl ester, 2,2-bis(4-hydroxyphenyl)propane, 1,1,3-tris(2-methyl-4-hydroxy-5-tert-butylphenyl)butane, 2-phenylamino-3-methyl-6-dibutylaminofluoran, 1,2-diphenoxyethane, OP-10, gul gum, zinc chloride and beta-hydroxyalkylamide is 25:45:35:25:22:11:11:35:25:9:7.

[0046] The preparation of the pressure-sensitive adhesive comprises the following steps:

[0047] S1. Tetrahydrofurfuryl methacrylate, rosin acrylate, lauryl methacrylate, acrylic acid, and ethyl acetate are placed in a reaction kettle, heated to 78° C. in a nitrogen atmosphere, and azobisisobutyronitrile is added. The reaction is carried out for 3.5 hours to obtain material A; the mass ratio of tetrahydrofurfuryl methacrylate, rosin acrylate, lauryl methacrylate, acrylic acid, ethyl acetate, and azobisisobutyronitrile is 11:11:40:1.5:7.5:0.65;

[0048] S2. Mix the material A, triethylene glycol diacrylate and 2-hydroxy-2-methylpropiophenone, stir for 2.5 hours, apply, photocure and dry to obtain the pressure-sensitive adhesive; the mass ratio of the material A, triethylene glycol diacrylate and 2-hydroxy-2-methylpropiophenone is 13:2.5:0.22.

[0049] The preparation of the silicone release agent comprises the following steps:

[0050] Take tripropylene glycol diacrylate, vinyl polydimethylsiloxane, versatate, triphenylsulfonium phosphonium hexafluoride, polyethylene glycol, and polyoxyethylene castor oil, mix them, stir for 1.5 hours, add fumed silica, stir for 25 minutes, add phytic acid and KH550, and continue stirring for 1.5 hours to obtain the silicone release agent; the mass ratio of the tripropylene glycol diacrylate, vinyl polydimethylsiloxane, versatate, triphenylsulfonium phosphonium hexafluoride, polyethylene glycol, polyoxyethylene castor oil, fumed silica, phytic acid, and KH550 is 15:45:25:1.5:100:2.5:35:35:1.5.

[0051] Example 3

[0052] A pressure-sensitive adhesive paper containing a heat-sensitive coating and an organosilicon release agent comprises base paper, a heat-sensitive coating, an organosilicon release agent and a pressure-sensitive adhesive; the heat-sensitive coating is coated on one side of the base paper, the pressure-sensitive adhesive is coated on the other side of the base paper, and the organosilicon release agent is coated on the side of the heat-sensitive coating away from the base paper.

[0053] The thermosensitive coating includes a bottom layer liquid and a color-forming layer liquid, wherein the bottom layer liquid is coated on the surface of the base paper, and the color-forming layer liquid is coated on the surface of the bottom layer liquid; the coating amount of the bottom layer liquid is 15 g / m 2 The coating amount of the color-forming layer liquid is 8 g / m 2 .

[0054] The preparation of the bottom layer liquid comprises the following steps:

[0055] Calcined kaolin, light calcium carbonate and polyvinyl alcohol were mixed and stirred for 3 hours to obtain a bottom liquid; the mass ratio of the calcined kaolin, light calcium carbonate and polyvinyl alcohol was 65:35:12.

[0056] The preparation of the chromogenic layer liquid comprises the following steps:

[0057] Acrylic resin, xylene and butyl ester were mixed and stirred for 3 hours, 2,2-bis(4-hydroxyphenyl)propane, 1,1,3-tris(2-methyl-4-hydroxy-5-tert-butylphenyl)butane, 2-phenylamino-3-methyl-6-dibutylaminofluoran, 1,2-diphenoxyethane, OP-10, Gul gum, zinc chloride and β-hydroxyalkylamide were added and stirred for 6 hours to obtain a color-forming layer liquid;

[0058] The mass ratio of the acrylic resin, xylene, butyl ester, 2,2-bis(4-hydroxyphenyl)propane, 1,1,3-tris(2-methyl-4-hydroxy-5-tert-butylphenyl)butane, 2-phenylamino-3-methyl-6-dibutylaminofluoran, 1,2-diphenoxyethane, OP-10, gul gum, zinc chloride and beta-hydroxyalkylamide is 30:50:40:30:25:12:12:40:30:10:8.

[0059] The preparation of the pressure-sensitive adhesive comprises the following steps:

[0060] S1, tetrahydrofurfuryl methacrylate, rosin acrylate, lauryl methacrylate, acrylic acid, and ethyl acetate are placed in a reaction kettle, heated to 80°C in a nitrogen atmosphere, and azobisisobutyronitrile is added, and the reaction is carried out for 4 hours to obtain material A; the mass ratio of tetrahydrofurfuryl methacrylate, rosin acrylate, lauryl methacrylate, acrylic acid, ethyl acetate, and azobisisobutyronitrile is 12:12:45:2:8:0.8;

[0061] S2. Mix the material A, triethylene glycol diacrylate and 2-hydroxy-2-methylpropiophenone, stir for 3 hours, apply, photocure and dry to obtain the pressure-sensitive adhesive; the mass ratio of the material A, triethylene glycol diacrylate and 2-hydroxy-2-methylpropiophenone is 15:3:0.25.

[0062] The preparation of the silicone release agent comprises the following steps:

[0063] Take tripropylene glycol diacrylate, vinyl polydimethylsiloxane, versatate, triphenylsulfonium phosphonium hexafluoride, polyethylene glycol, and polyoxyethylene castor oil, mix them, stir for 2 hours, add fumed silica, stir for 30 minutes, add phytic acid and KH550, and continue stirring for 2 hours to obtain the silicone release agent; the mass ratio of the tripropylene glycol diacrylate, vinyl polydimethylsiloxane, versatate, triphenylsulfonium phosphonium hexafluoride, polyethylene glycol, polyoxyethylene castor oil, fumed silica, phytic acid, and KH550 is 20:50:35:2:100:3:40:40:2.

[0064] Comparative Example 1

[0065] The difference from Example 1 is that zinc chloride is not added during the preparation of the color-forming layer liquid.

[0066] Comparative Example 2

[0067] The difference from Example 1 is that no phytic acid is added during the preparation of the silicone release agent.

[0068] Comparative Example 3

[0069] The difference from Example 1 is that KH550 is not added during the preparation of the silicone release agent.

[0070] Performance Testing

[0071] The pressure-sensitive adhesive tapes containing the heat-sensitive coating and the silicone release agent obtained in the above Examples 1-3 and Comparative Examples 1-3 were subjected to the following performance tests: 20-min release force, release force, aged release force, and residual rate.

[0072] The 20min release force test method is as follows: first TM 7475 tape was attached to the release surface of the pressure-sensitive adhesive paper containing the heat-sensitive coating and the silicone release agent obtained in the above Examples 1-3 and Comparative Examples 1-3, and rolled back and forth three times with a 2kg roller, and then cut to obtain a 25mm*130mm sample strip. The sample strip was placed at room temperature for 20 minutes and then attached to the adhesive steel plate. The tensile test machine was used to peel the tesa at an angle of 180 degrees and a peeling speed of 300mm / min. TM For 7475 tape, the reading on the tensile testing machine is the 20-min release force.

[0073] The above specimen placement conditions are changed to room temperature*24h, and the specimen is placed under a glass plate and pressed tightly, while other conditions remain unchanged. When the time is up, the specimen is taken out and the measured result is the release force.

[0074] The conditions for placing the above-mentioned specimens are changed to 70℃*24h, and the specimens are pressed under a 3kg weight, while the rest remain unchanged. When the time is up, the specimens are taken out and the measured result is the aged release force.

[0075] The residual rate test method is as follows:

[0076] 1. Standard tape N ITTO TM 31B is attached to the release surface to be tested, and rolled back and forth three times with a 2kg roller. The sample strips with a size of 25mm*300mm are cut and placed horizontally between two glass plates.

[0077] 2. Place the glass plate at 70℃, 50% RH, and 2kg weight pressure for 20 hours, then cool it at room temperature for 4 hours and take out the sample. TM 31 B standard tape is slowly peeled off from the release film and then attached to the steel plate. A 2kg electric roller is used to roll back and forth twice at a speed of 300mm / min under its own weight. After leaving it for 20 minutes, the tape is peeled off on a tensile testing machine at a speed of 300mm / min. The average peeling force of the tensile testing machine reading is recorded as L1.

[0078] 3. Put the new NI TTO TM 31B standard tape (the same roll as the tape used for sticking the specimen) is directly attached to the steel plate, rolled back and forth twice at a speed of 300 mm / min under its own weight, left for 20 minutes, and peeled off the tape at a speed of 300 mm / min on a tensile testing machine. The average peeling force of the tensile testing machine reading is recorded as L0.

[0079] 4. The residual rate is calculated as follows:

[0080]

[0081] The higher the residual rate, the smaller the release force, which means the better the release performance and the smaller the effect on the stickiness of the sticky material attached to its surface; the samples with low residual rate are mainly because the silicone in the silicone release agent penetrates into the base paper of the pressure-sensitive adhesive paper, causing poor curing, affecting the structural stability of the paper, and making it difficult to peel off.

[0082] The test results are shown in Table 1 below.

[0083] Table 1

[0084]

[0085] It can be seen from Table 1 that the pressure-sensitive adhesive tape containing a heat-sensitive coating and a silicone release agent prepared in Examples 1-3 of the present application has an excellent release effect; Comparative Examples 1-3 are prepared on the basis of Example 1, and since no barrier is formed between the heat-sensitive coating and the silicone release agent to block the penetration of silicone, the release effect of the pressure-sensitive adhesive tape containing a heat-sensitive coating and a silicone release agent prepared in Comparative Examples 1-3 becomes poor and difficult to peel off.

[0086] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A pressure-sensitive adhesive tape containing a heat-sensitive coating and a silicone release agent, characterized in that: It comprises base paper, a heat-sensitive coating, a silicone release agent and a pressure-sensitive adhesive; the heat-sensitive coating is coated on one side of the base paper, the pressure-sensitive adhesive is coated on the other side of the base paper, and the silicone release agent is coated on the side of the heat-sensitive coating away from the base paper; The thermosensitive coating comprises a bottom layer liquid and a color-forming layer liquid, wherein the bottom layer liquid is coated on the surface of the base paper, and the color-forming layer liquid is coated on the surface of the bottom layer liquid; the coating amount of the bottom layer liquid is 8-15 g / m 2 The coating amount of the color-forming layer liquid is 2-8 g / m 2 ; The preparation of the pressure-sensitive adhesive comprises the following steps: S1, tetrahydrofurfuryl methacrylate, rosin acrylate, lauryl methacrylate, acrylic acid, and ethyl acetate are placed in a reaction kettle, heated to 75-80° C. in a nitrogen atmosphere, and azobisisobutyronitrile is added, and reacted for 3-4 hours to obtain material A; S2, taking the material A, triethylene glycol diacrylate, and 2-hydroxy-2-methylpropiophenone, mixing, stirring for 2-3 hours, coating, light curing, and drying to obtain the pressure-sensitive adhesive; In step S1, the mass ratio of tetrahydrofurfuryl methacrylate, rosin acrylate, lauryl methacrylate, acrylic acid, ethyl acetate, and azobisisobutyronitrile is 10-12:10-12:35-45:1-2:7-8:0.5-0.8; In step S2, the mass ratio of material A, triethylene glycol diacrylate, and 2-hydroxy-2-methylpropiophenone is 10-15:2-3:0.15-0.25; The preparation of the silicone release agent comprises the following steps: Take tripropylene glycol diacrylate, vinyl polydimethylsiloxane, versatate, triphenylsulfonium phosphine hexafluoride, polyethylene glycol, and polyoxyethylene castor oil, mix them, stir for 1-2 hours, add fumed silica, stir for 20-30 minutes, add phytic acid and KH550, continue stirring for 1-2 hours, and obtain the silicone release agent; The preparation of the bottom layer liquid comprises the following steps: Take calcined kaolin, light calcium carbonate and polyvinyl alcohol and mix them, stir for 2-3 hours to obtain a bottom layer liquid; The mass ratio of the calcined kaolin, light calcium carbonate and polyvinyl alcohol is 60-65:20-35:10-12; The preparation of the chromogenic layer liquid comprises the following steps: Take acrylic resin, xylene and butyl ester, mix them, stir for 2-3 hours, add 2,2-bis(4-hydroxyphenyl)propane, 1,1,3-tris(2-methyl-4-hydroxy-5-tert-butylphenyl)butane, 2-phenylamino-3-methyl-6-dibutylaminofluoran, 1,2-diphenoxyethane, OP-10, gul gum, zinc chloride and β-hydroxyalkylamide, mix them, stir for 4-6 hours to obtain a color layer liquid.

2. A pressure-sensitive adhesive tape containing a heat-sensitive coating and a silicone release agent according to claim 1, characterized in that: The mass ratio of tripropylene glycol diacrylate, vinyl polydimethylsiloxane, versatate, triphenylsulfonium phosphine hexafluoride, polyethylene glycol, polyoxyethylene castor oil, fumed silica, phytic acid and KH550 is 10-20:40-50:20-35:1-2:100:2-3:30-40:30-40:1-2.

3. The pressure-sensitive adhesive tape containing a heat-sensitive coating and a silicone release agent according to claim 1, characterized in that: The mass ratio of the acrylic resin, xylene, butyl ester, 2,2-bis(4-hydroxyphenyl)propane, 1,1,3-tris(2-methyl-4-hydroxy-5-tert-butylphenyl)butane, 2-phenylamino-3-methyl-6-dibutylaminofluoran, 1,2-diphenoxyethane, OP-10, gul gum, zinc chloride and beta-hydroxyalkylamide is 20-30:40-50:30-40:20-30:20-25:10-12:10-12:30-40:20-30:8-10:6-8.

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