A special adhesive tape for printing and preparation method thereof

Abstract

The present invention provides a special printing adhesive tape and a preparation method thereof, belonging to the technical field of adhesive tapes. The preparation method comprises the following steps: uniformly mixing a modified acrylic resin, a modified liquid silicone resin, a diluent, a terpene phenol resin, a photoinitiator and a leveling agent to obtain a pressure-sensitive adhesive solution; coating and printing ink on one side of a substrate layer to form a printing layer; coating the pressure-sensitive adhesive solution on the other side of the substrate layer, and then curing it with ultraviolet light to form a pressure-sensitive adhesive layer; and obtaining the special printing adhesive tape. The modified acrylic resin is obtained by reacting polyisobutylene, ethyl acrylate, hydroxypropyl acrylate, octadecyl methacrylate, pentaerythritol tetramethacrylate, pentaerythritol triacrylate and allyl tris(trimethylsiloxy)silane. The special printing adhesive tape prepared by the present invention has good adhesion and durability, can maintain excellent holding power, and will not easily debond at high temperatures.

Description

Technical Field

[0001] The invention belongs to the technical field of adhesive tapes, and in particular relates to an adhesive tape specially used for printing and a preparation method thereof. Background Art

[0002] Printed tape is a versatile material widely used in packaging, carton sealing, label making and various creative purposes. It not only provides sealing and fixing functions, but also can increase the visual appeal and market recognition of products by customizing printed patterns, text or brand logos. It plays an indispensable role in both commercial and personal use. With the advancement of technology and the growth of market demand, tape has gradually evolved into today's highly professional and diverse product type. Printed tape usually consists of three parts: substrate, coating and printing layer. The substrate is the basis for the entire structure. Different materials such as cloth, paper, plastic film can be selected to meet specific application requirements; the coating is the key component that gives the tape stickiness, which determines the adhesiveness, durability and adhesion to different surfaces of the tape; in order to achieve good printing effects, advanced printing technology and inks are also used to ensure clear images, bright and lasting colors, and not easy to fade or fall off.

[0003] At present, printed tapes still face many challenges in practical applications, and these problems are particularly prominent in specific environments. Among them, low adhesion is a common problem, which causes the tape to gradually lose its stickiness after a period of use, especially in humid, dusty or temperature-changing environments. This phenomenon is more obvious. Insufficient adhesion affects the adhesion of the tape to surfaces of different materials. For example, on smooth, greasy or uneven surfaces, the tape may not provide sufficient fixing force and may easily fall off or shift. Insufficient durability is also a major concern. The tape may age due to ultraviolet radiation, moisture invasion or chemical erosion, which in turn affects its function and appearance. In addition, in high temperature environments, the tape is easy to soften or even melt, destroying its structural integrity and may cause damage to the items it fixes; under low temperature conditions, the tape may become brittle, lose elasticity, and fail to work properly, especially in application scenarios that require frequent bending or stretching. This problem is even more serious.

[0004] In order to improve the holding power and adhesion, the adhesive formula of the tape is generally improved, such as using stronger synthetic rubber or acrylic polymers. These materials can provide stronger initial viscosity and long-term bonding effects, but this enhanced adhesive performance may cause residue problems when the tape is removed, especially on uneven or rough surfaces. In order to improve heat resistance and low temperature resistance, the prior art will introduce additional materials such as silicone, polyimide and fluoropolymer, which can maintain good performance at extreme temperatures, but these materials are often expensive, limiting their wide application. In order to improve durability, a protective film is added to the surface of the tape or a multi-layer structure is used to resist the erosion of ultraviolet rays, moisture and chemicals, thereby extending the service life of the tape, but in some cases the additional coating may reduce the transparency of the tape or affect the printing quality. Therefore, there is an urgent need for a special printing tape with excellent comprehensive performance. Summary of the invention

[0005] The purpose of the present invention is to provide a special printing tape and a preparation method thereof. By adding homemade modified acrylic resin, modified liquid silicone resin and terpene phenol resin to form a pressure-sensitive adhesive solution, the adhesion and durability of the special printing tape are further improved, so that it maintains excellent adhesion and can avoid the problem of easy debonding at high temperature.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] The present invention provides a method for preparing a special printing tape, comprising the following steps:

[0008] S1, 80-100 parts by weight of modified acrylic resin, 5-15 parts by weight of modified liquid silicone resin, 10-30 parts by weight of diluent, 3-7 parts by weight of terpene phenol resin, 1-2 parts by weight of photoinitiator and 0.4-0.6 parts by weight of leveling agent are mixed uniformly to obtain a pressure-sensitive adhesive solution;

[0009] S2. Apply ink to one side of the substrate layer by flexographic printing to form a printing layer; apply a pressure-sensitive adhesive solution to the other side of the substrate layer, and then cure it with ultraviolet light for 5-10 seconds to form a pressure-sensitive adhesive layer; and obtain the special printing tape.

[0010] The present invention uses a specific modified acrylic resin as the main component of the pressure-sensitive adhesive liquid, thereby achieving the effect of significantly improving the adhesive tape's bonding ability and high and low temperature resistance. The core of the invention is that: on the one hand, allyl tris (trimethylsiloxy) silane monomer is introduced, and this monomer has a high silicon content, which can significantly improve the high temperature resistance of acrylate. Since its structure contains a highly reactive double bond, it can easily copolymerize with acrylate monomers, which not only enhances the thermal stability of the material, but also improves the stability of the entire system due to its multi-branched silane structure, effectively preventing the occurrence of microphase separation, which makes the modified acrylate molecular structure more solid, thereby greatly improving the adhesive tape's bonding ability; on the other hand, polyisobutylene is also introduced to give the modified acrylic resin rubber-based flexibility and low-temperature soft elasticity. Under the action of an initiator, the free radicals formed by the acrylate monomer can be linked to a network structure with the free radicals generated by the double bond ring opening in the polyisobutylene. This process greatly increases the cohesion and adhesion of the pressure-sensitive adhesive system, and the tape can also maintain good elasticity and adhesion under low temperature conditions, ensuring its reliability in various environments. In addition, the present invention also adopts multifunctional acrylate monomers pentaerythritol tetramethacrylate and pentaerythritol triacrylate. The introduction of these monomers not only improves the crosslinking density of the system, but also realizes chemical bonding with the silicone resin under the action of the initiator, thereby maintaining good plasticity while improving the crosslinking density, so that the pressure-sensitive adhesive has excellent adhesion and temperature resistance.

[0011] Preferably, the preparation method of the modified acrylic resin comprises the following steps:

[0012] 40-60 parts by weight of toluene, 30-50 parts by weight of ethyl acetate and 8-12 parts by weight of polyisobutylene are mixed, stirred for 0.2-0.6h at 60-70°C, 100-250r / min and nitrogen atmosphere, and then 0.03-0.07 parts by weight of azobisisobutyronitrile are added and stirred for 2-3h; then the temperature is raised to 80-90°C, 10-15 parts by weight of ethyl acrylate, 6-10 parts by weight of hydroxypropyl acrylate, 10-15 parts by weight of octadecyl methacrylate, 6-10 parts by weight of pentaerythritol tetramethacrylate, 3-6 parts by weight of pentaerythritol triacrylate, 2-5 parts by weight of allyl tris(trimethylsiloxy)silane and 0.03-0.06 parts by weight of azobisisobutyronitrile are added and stirred for 4-6h to obtain a modified acrylic resin.

[0013] The present invention also adds a specific modified liquid silicone resin to the pressure-sensitive adhesive liquid, further improving the adhesive tape's bonding ability and heat resistance. As a macromolecular crosslinking agent, it forms a soft-hard interpenetrating network structure with modified acrylic resin and terpene phenol resin through multiple crosslinking methods, which helps to enhance the synergy between the components and improve the overall performance of the tape. The high silicon content and unique molecular structure of the modified liquid silicone resin enable it to have excellent heat resistance, and it can remain stable under high temperature environments, and will not soften or melt like traditional tapes. In addition, since the thiol and other reactive functional groups in the silicone resin can undergo multiple crosslinking methods with modified acrylic resin and terpene phenol resin, a three-dimensional interpenetrating network is formed, so that the interaction between the components is more closely, and the overall cohesion and strength of the material are enhanced, especially the existence of the soft-hard interpenetrating network, which not only ensures the softness and plasticity of the tape at room temperature, but also gives it rigidity and stability under high temperature conditions. The addition of surface-modified inorganic fillers such as nano-silica and calcium sulfate whiskers further improves the physical properties of the tape. After surface modification, it can be better compatible with organic components, reduce interface defects, and improve the uniformity and density of the overall structure. It not only helps to prevent microphase separation, but also promotes the synergistic effect between the components, so that the tape can maintain stable bonding performance after long-term use.

[0014] Preferably, the method for preparing the modified liquid silicone resin comprises the following steps:

[0015] 8-12 parts by weight of an inorganic filler is mixed with 40-50 parts by weight of toluene and 40-50 parts by weight of ethyl acetate, and then ultrasonically dispersed for 0.3-0.6 hours, and then 0.7-1 parts by weight of triethylsilyl chloride and 0.3-0.5 parts by weight of 7-octyldimethylsilyl chloride are added, stirred for 3-5 hours, filtered, and dried to obtain a surface-modified inorganic filler;

[0016] Take 30-50 parts by weight of hexamethyldisiloxane, 10-20 parts by weight of mercaptopropyltrimethoxysilane, 4-6 parts by weight of mercaptoethyltriethoxysilane, 10-20 parts by weight of n-propyltriethoxysilane, 4-6 parts by weight of triethoxysilane, 7-10 parts by weight of water and 0.1-0.3 parts by weight of concentrated hydrochloric acid, mix them and stir to react for 10-30 minutes, then add 0.2-0.5 parts by weight of 1-hydroxycyclohexyl phenyl ketone, 1-3 parts by weight of surface-modified inorganic filler and 0.1-0.2 parts by weight of concentrated hydrochloric acid, stir to react for 20-40 minutes, and obtain a modified liquid silicone resin.

[0017] Preferably, the inorganic filler is composed of nano-silicon dioxide and calcium sulfate whiskers in a weight ratio of 3:1-5.

[0018] Furthermore, the preparation method of the modified liquid silicone resin comprises the following steps:

[0019] 8-12 parts by weight of an inorganic filler is mixed with 40-50 parts by weight of toluene and 40-50 parts by weight of ethyl acetate, and ultrasonically dispersed for 0.3-0.6 hours at an ultrasonic frequency of 20-30 kHz and an ultrasonic power of 100-300 W, and then 0.7-1 parts by weight of triethylsilyl chloride and 0.3-0.5 parts by weight of 7-octyldimethylsilyl chloride are added, and stirred at 40-50° C. and 200-400 r / min for 3-5 hours, filtered, and dried to obtain a surface-modified inorganic filler;

[0020] Take 30-50 parts by weight of hexamethyldisiloxane, 10-20 parts by weight of mercaptopropyltrimethoxysilane, 4-6 parts by weight of mercaptoethyltriethoxysilane, 10-20 parts by weight of n-propyltriethoxysilane, 4-6 parts by weight of triethoxysilane, 7-10 parts by weight of water and 0.1-0.3 parts by weight of 33-36wt% concentrated hydrochloric acid, stir and react at 40-50°C for 10-30min, filter to remove solid impurities, then add 0.2-0.5 parts by weight of 1-hydroxycyclohexylphenyl ketone, 1-3 parts by weight of surface-modified inorganic filler, 0.1-0.2 parts by weight of 33-36wt% concentrated hydrochloric acid, stir and react at 45-60°C for 20-40min, and evacuate at 80-90°C to remove low-boiling impurities to obtain a modified liquid silicone resin.

[0021] Preferably, the material of the substrate layer is any one of PET film, BOPP film, PVC film and PE film.

[0022] Preferably, the thickness of the substrate layer is 40-60 μm; the thickness of the printing layer is 4-6 μm; and the thickness of the pressure-sensitive adhesive layer is 20-30 μm.

[0023] Preferably, the ink is any one of water-based ink, solvent-based ink and UV ink.

[0024] Preferably, the illumination intensity of the ultraviolet light is 800-1000mW / cm².

[0025] Preferably, the diluent is any one of toluene, N,N-dimethylformamide and N-methylpyrrolidone.

[0026] Preferably, the photoinitiator is any one of photoinitiator 2959, photoinitiator 1173, photoinitiator 6992, photoinitiator 819, and photoinitiator 307.

[0027] Preferably, the leveling agent is any one of BYK331 leveling agent, BYK349 ​​leveling agent, TEGO410 leveling agent, and TEGO450 leveling agent.

[0028] The invention also provides a special printing adhesive tape prepared by the method.

[0029] Compared with the prior art, the advantages and beneficial effects of the present invention are:

[0030] 1. The present invention provides a special adhesive tape for printing and a preparation method thereof. The adhesive tape for printing is significantly improved in adhesion and durability by adopting a modified acrylic resin obtained by reacting polyisobutylene, ethyl acrylate, hydroxypropyl acrylate, octadecyl methacrylate, pentaerythritol tetramethacrylate, pentaerythritol triacrylate and allyl tris(trimethylsiloxy)silane, and a modified liquid silicone resin made of hexamethyldisiloxane, mercaptopropyl trimethoxysilane, mercaptoethyl triethoxysilane, n-propyl triethoxysilane, triethoxysilane and a surface-modified inorganic filler, so that the adhesive tape for printing is maintained with excellent holding power and the problem of easy debonding at high temperature is avoided.

[0031] 2. The present invention uses a specific modified acrylic resin as the main component of the pressure-sensitive adhesive liquid, thereby significantly improving the adhesive ability and high and low temperature resistance of the tape. On the one hand, the allyl tris(trimethylsiloxy)silane monomer is introduced, which can significantly improve the high temperature resistance of acrylate, and its multi-branched silane structure improves the stability of the entire system, thereby greatly improving the adhesive ability of the tape; on the other hand, polyisobutylene is introduced to give the modified acrylic resin rubber-based flexibility and low-temperature soft elasticity, so that the tape can maintain good elasticity and adhesion properties under low temperature conditions, ensuring its reliability in various environments.

[0032] 3. The present invention also adopts the addition of a specific modified liquid silicone resin to further improve the adhesive ability and heat resistance of the tape. As a macromolecular crosslinking agent, it forms a soft-hard interpenetrating network structure with the modified acrylic resin and the terpene-phenol resin through a variety of crosslinking methods, which helps to enhance the synergistic effect between the components and improve the overall performance of the tape. Since the thiol and other reactive functional groups in the silicone resin can be crosslinked with the modified acrylic resin and the terpene-phenol resin in a variety of ways, a three-dimensional interpenetrating network is formed, which makes the interaction between the components closer and enhances the overall cohesion and strength of the material. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. 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.

[0034] Terpene phenol resin, model: TP300, average molecular weight: 790, manufacturer: Kraton, USA.

[0035] Polyisobutylene, model: PB1300, average molecular weight: 1300, manufacturer: Dalin, South Korea.

[0036] Example 1

[0037] This embodiment provides a method for preparing a special printing tape, comprising the following steps:

[0038] S1. 90 parts by weight of modified acrylic resin, 10 parts by weight of modified liquid silicone resin, 20 parts by weight of diluent, 5 parts by weight of terpene phenol resin, 1.5 parts by weight of photoinitiator and 0.5 parts by weight of leveling agent are mixed evenly to obtain a pressure-sensitive adhesive solution; the diluent is N,N-dimethylformamide; the photoinitiator is photoinitiator 2959; and the leveling agent is BYK331 leveling agent;

[0039] S2. Apply the ink on one side of the substrate layer by flexographic printing to form a printing layer; apply the pressure-sensitive adhesive liquid on the other side of the substrate layer, and then cure it with ultraviolet light (UV) for 5 seconds with a light intensity of 1000mW / cm² to form a pressure-sensitive adhesive layer; and obtain the special printing tape. The substrate layer is made of PET film with a thickness of 50μm; the printing layer is 5μm thick; and the pressure-sensitive adhesive layer is 25μm thick.

[0040] The preparation method of the modified acrylic resin comprises the following steps:

[0041] 50 parts by weight of toluene, 40 parts by weight of ethyl acetate and 10 parts by weight of polyisobutylene are mixed, stirred at 65°C, 200 r / min and nitrogen atmosphere for 0.5 h, then 0.05 parts by weight of azobisisobutyronitrile are added and stirring is continued for 2.5 h; then the temperature is raised to 85°C, 12 parts by weight of ethyl acrylate, 8 parts by weight of hydroxypropyl acrylate, 12 parts by weight of octadecyl methacrylate, 8 parts by weight of pentaerythritol tetramethacrylate, 5 parts by weight of pentaerythritol triacrylate, 3 parts by weight of allyl tris(trimethylsiloxy)silane and 0.05 parts by weight of azobisisobutyronitrile are added and stirred for 5 h to obtain a modified acrylic resin.

[0042] The preparation method of the modified liquid silicone resin comprises the following steps:

[0043] 10 parts by weight of an inorganic filler are mixed with 45 parts by weight of toluene and 45 parts by weight of ethyl acetate, and ultrasonically dispersed for 0.5 h at an ultrasonic frequency of 25 kHz and an ultrasonic power of 200 W, and then 0.8 parts by weight of triethylsilyl chloride and 0.4 parts by weight of 7-octyldimethylsilyl chloride are added, and stirred for 3.5 h at 45° C. and 300 r / min, filtered, and dried to obtain a surface-modified inorganic filler; the inorganic filler is composed of nano-silicon dioxide (average particle size of 200 nm) and calcium sulfate whiskers (average length of 60 μm, average aspect ratio of 40) in a weight ratio of 3:2;

[0044] Take 40 parts by weight of hexamethyldisiloxane, 15 parts by weight of mercaptopropyltrimethoxysilane, 5 parts by weight of mercaptoethyltriethoxysilane, 15 parts by weight of n-propyltriethoxysilane, 5 parts by weight of triethoxysilane, 8 parts by weight of water and 0.2 parts by weight of 35wt% concentrated hydrochloric acid, stir and react at 40°C for 20 minutes, filter to remove solid impurities, then add 0.3 parts by weight of 1-hydroxycyclohexyl phenyl ketone, 1.2 parts by weight of surface-modified inorganic filler, 0.1 parts by weight of 35wt% concentrated hydrochloric acid, stir and react at 50°C for 30 minutes, and evacuate at 80°C to remove low-boiling impurities to obtain a modified liquid silicone resin.

[0045] Example 2

[0046] This embodiment provides a special printing tape, comprising the following raw materials in parts by weight:

[0047] S1. 80 parts by weight of modified acrylic resin, 5 parts by weight of modified liquid silicone resin, 10 parts by weight of diluent, 3 parts by weight of terpene phenol resin, 1 part by weight of photoinitiator and 0.4 parts by weight of leveling agent are mixed evenly to obtain a pressure-sensitive adhesive solution; the diluent is N,N-dimethylformamide; the photoinitiator is photoinitiator 2959; and the leveling agent is BYK331 leveling agent;

[0048] S2. Apply the ink on one side of the substrate layer by flexographic printing to form a printing layer; apply the pressure-sensitive adhesive liquid on the other side of the substrate layer, and then cure it with ultraviolet light (UV) for 5 seconds with a light intensity of 800mW / cm² to form a pressure-sensitive adhesive layer; and obtain the special printing tape. The substrate layer is made of PET film with a thickness of 40μm; the printing layer is 4μm thick; and the pressure-sensitive adhesive layer is 20μm thick.

[0049] The modified acrylic resin is the same as that in Example 1.

[0050] The modified liquid silicone resin is the same as that in Example 1.

[0051] Example 3

[0052] This embodiment provides a special printing tape, comprising the following raw materials in parts by weight:

[0053] S1. 100 parts by weight of modified acrylic resin, 15 parts by weight of modified liquid silicone resin, 30 parts by weight of diluent, 7 parts by weight of terpene phenol resin, 2 parts by weight of photoinitiator and 0.6 parts by weight of leveling agent are mixed uniformly to obtain a pressure-sensitive adhesive solution; the diluent is N,N-dimethylformamide; the photoinitiator is photoinitiator 2959; and the leveling agent is BYK331 leveling agent;

[0054] S2. Apply the ink on one side of the substrate layer by flexographic printing to form a printing layer; apply the pressure-sensitive adhesive liquid on the other side of the substrate layer, and then cure it with ultraviolet light (UV) for 10 seconds with a light intensity of 1000mW / cm² to form a pressure-sensitive adhesive layer; and obtain the special printing tape. The substrate layer is made of PET film with a thickness of 60μm; the printing layer is 6μm thick; and the pressure-sensitive adhesive layer is 30μm thick.

[0055] The modified acrylic resin is the same as that in Example 1.

[0056] The modified liquid silicone resin is the same as that in Example 1.

[0057] Comparative Example 1

[0058] The difference between this comparative example and Example 1 is that the preparation method of the modified acrylic resin is different, which is as follows: The preparation method of the modified acrylic resin comprises the following steps:

[0059] 50 parts by weight of toluene and 40 parts by weight of ethyl acetate were mixed, and 12 parts by weight of ethyl acrylate, 8 parts by weight of hydroxypropyl acrylate, 12 parts by weight of octadecyl methacrylate, 8 parts by weight of pentaerythritol tetramethacrylate, 5 parts by weight of pentaerythritol triacrylate, 3 parts by weight of allyl tris(trimethylsiloxy)silane and 0.1 parts by weight of azobisisobutyronitrile were added at 85°C, 200 r / min and nitrogen atmosphere, and the mixture was stirred for reaction for 5 hours to obtain a modified acrylic resin.

[0060] Comparative Example 2

[0061] The difference between this comparative example and Example 1 is that the preparation method of the modified acrylic resin is different, which is as follows: The preparation method of the modified acrylic resin comprises the following steps:

[0062] 50 parts by weight of toluene, 40 parts by weight of ethyl acetate and 10 parts by weight of polyisobutylene are mixed, stirred at 65°C, 200 r / min and nitrogen atmosphere for 0.5 h, then 0.05 parts by weight of azobisisobutyronitrile are added and stirring is continued for 2.5 h; then the temperature is raised to 85°C, 12 parts by weight of ethyl acrylate, 8 parts by weight of hydroxypropyl acrylate, 12 parts by weight of octadecyl methacrylate, 8 parts by weight of pentaerythritol tetramethacrylate, 5 parts by weight of pentaerythritol triacrylate and 0.05 parts by weight of azobisisobutyronitrile are added and stirred for 5 h to obtain a modified acrylic resin.

[0063] Comparative Example 3

[0064] The difference between this comparative example and Example 1 is that the preparation method of the modified acrylic resin is different, which is as follows: The preparation method of the modified acrylic resin comprises the following steps:

[0065] 50 parts by weight of toluene, 40 parts by weight of ethyl acetate and 10 parts by weight of polyisobutylene were mixed, stirred at 65°C, 200 r / min and nitrogen atmosphere for 0.5 h, then 0.05 parts by weight of azobisisobutyronitrile were added and stirring was continued for 2.5 h; then the temperature was raised to 85°C, 12 parts by weight of ethyl acrylate, 21 parts by weight of hydroxypropyl acrylate, 12 parts by weight of octadecyl methacrylate, 3 parts by weight of allyl tris(trimethylsiloxy)silane and 0.05 parts by weight of azobisisobutyronitrile were added and stirred for 5 h to obtain a modified acrylic resin.

[0066] Comparative Example 4

[0067] The difference between this comparative example and Example 1 is that the preparation method of the modified liquid organic silicone resin is different, which is as follows: The preparation method of the modified liquid organic silicone resin comprises the following steps:

[0068] Take 40 parts by weight of hexamethyldisiloxane, 15 parts by weight of mercaptopropyltrimethoxysilane, 5 parts by weight of mercaptoethyltriethoxysilane, 15 parts by weight of n-propyltriethoxysilane, 5 parts by weight of triethoxysilane, 8 parts by weight of water and 0.2 parts by weight of 35wt% concentrated hydrochloric acid, stir and react at 40°C for 20min, filter to remove solid impurities, then add 0.3 parts by weight of 1-hydroxycyclohexylphenyl ketone, 1.2 parts by weight of inorganic filler, 0.1 parts by weight of 35wt% concentrated hydrochloric acid, stir and react at 50°C for 30min, vacuum at 80°C to remove low-boiling impurities, and obtain a modified liquid silicone resin. The inorganic filler is composed of nano-silicon dioxide (average particle size of 200nm) and calcium sulfate whiskers (average length of 60μm, average aspect ratio of 40) in a weight ratio of 3:2.

[0069] Comparative Example 5

[0070] The difference between this comparative example and Example 1 is that the preparation method of the modified liquid organic silicone resin is different, which is as follows: The preparation method of the modified liquid organic silicone resin comprises the following steps:

[0071] 10 parts by weight of an inorganic filler is mixed with 45 parts by weight of toluene and 45 parts by weight of ethyl acetate, and ultrasonically dispersed for 0.5 h at an ultrasonic frequency of 25 kHz and an ultrasonic power of 200 W, and then 0.8 parts by weight of triethylchlorosilane and 0.4 parts by weight of 7-octyldimethylchlorosilane are added, and stirred for 3.5 h at 45° C. and 300 r / min, filtered, and dried to obtain a surface-modified inorganic filler; the inorganic filler is nano-silicon dioxide (with an average particle size of 200 nm);

[0072] Take 40 parts by weight of hexamethyldisiloxane, 15 parts by weight of mercaptopropyltrimethoxysilane, 5 parts by weight of mercaptoethyltriethoxysilane, 15 parts by weight of n-propyltriethoxysilane, 5 parts by weight of triethoxysilane, 8 parts by weight of water and 0.2 parts by weight of 35wt% concentrated hydrochloric acid, stir and react at 40°C for 20 minutes, filter to remove solid impurities, then add 0.3 parts by weight of 1-hydroxycyclohexyl phenyl ketone, 1.2 parts by weight of surface-modified inorganic filler, 0.1 parts by weight of 35wt% concentrated hydrochloric acid, stir and react at 50°C for 30 minutes, and evacuate at 80°C to remove low-boiling impurities to obtain a modified liquid silicone resin.

[0073] Comparative Example 6

[0074] The difference between this comparative example and Example 1 is that the preparation method of the modified liquid organic silicone resin is different, which is as follows: The preparation method of the modified liquid organic silicone resin comprises the following steps:

[0075] 10 parts by weight of an inorganic filler is mixed with 45 parts by weight of toluene and 45 parts by weight of ethyl acetate, and ultrasonically dispersed for 0.5 h at an ultrasonic frequency of 25 kHz and an ultrasonic power of 200 W, and then 0.8 parts by weight of triethylsilyl chloride and 0.4 parts by weight of 7-octyldimethylsilyl chloride are added, and stirred for 3.5 h at 45° C. and 300 r / min, filtered, and dried to obtain a surface-modified inorganic filler; the inorganic filler is calcium sulfate whiskers (average length of 60 μm, average aspect ratio of 40);

[0076] Take 40 parts by weight of hexamethyldisiloxane, 15 parts by weight of mercaptopropyltrimethoxysilane, 5 parts by weight of mercaptoethyltriethoxysilane, 15 parts by weight of n-propyltriethoxysilane, 5 parts by weight of triethoxysilane, 8 parts by weight of water and 0.2 parts by weight of 35wt% concentrated hydrochloric acid, stir and react at 40°C for 20 minutes, filter to remove solid impurities, then add 0.3 parts by weight of 1-hydroxycyclohexyl phenyl ketone, 1.2 parts by weight of surface-modified inorganic filler, 0.1 parts by weight of 35wt% concentrated hydrochloric acid, stir and react at 50°C for 30 minutes, and evacuate at 80°C to remove low-boiling impurities to obtain a modified liquid silicone resin.

[0077] Comparative Example 7

[0078] The difference between this comparative example and Example 1 is that the preparation method of the modified liquid organic silicone resin is different, which is as follows: The preparation method of the modified liquid organic silicone resin comprises the following steps:

[0079] 10 parts by weight of an inorganic filler are mixed with 45 parts by weight of toluene and 45 parts by weight of ethyl acetate, and ultrasonically dispersed for 0.5 h at an ultrasonic frequency of 25 kHz and an ultrasonic power of 200 W, and then 0.8 parts by weight of triethylsilyl chloride and 0.4 parts by weight of 7-octyldimethylsilyl chloride are added, and stirred for 3.5 h at 45° C. and 300 r / min, filtered, and dried to obtain a surface-modified inorganic filler; the inorganic filler is composed of nano-silicon dioxide (average particle size of 200 nm) and calcium sulfate whiskers (average length of 60 μm, average aspect ratio of 40) in a weight ratio of 3:2;

[0080] Take 40 parts by weight of hexamethyldisiloxane, 30 parts by weight of n-propyltriethoxysilane, 10 parts by weight of triethoxysilane, 8 parts by weight of water and 0.2 parts by weight of 35wt% concentrated hydrochloric acid, stir and react at 40°C for 20 minutes, filter to remove solid impurities, then add 0.3 parts by weight of 1-hydroxycyclohexyl phenyl ketone, 1.2 parts by weight of surface-modified inorganic filler, and 0.1 parts by weight of 35wt% concentrated hydrochloric acid, stir and react at 50°C for 30 minutes, and vacuum at 80°C to remove low-boiling impurities to obtain a modified liquid silicone resin.

[0081] Control group

[0082] The difference between this control group and Example 1 is that the preparation method of the pressure-sensitive adhesive is different, specifically as follows: 90 parts by weight of commercial acrylic resin, 10 parts by weight of commercial silicone resin, 20 parts by weight of diluent, 5 parts by weight of terpene phenol resin, 1.5 parts by weight of photoinitiator and 0.5 parts by weight of leveling agent are mixed evenly to obtain a pressure-sensitive adhesive. The diluent is N,N dimethylformamide; the photoinitiator is photoinitiator 2959; the leveling agent is BYK331 leveling agent; the commercially available acrylic resin is an acrylic structural adhesive produced by Zhejiang Runhe Silicone New Materials Co., Ltd., model RH-AC5326, and the viscosity (20°C) is 18000mPa.s; the commercially available silicone resin is a vinyl MQ resin produced by Hubei Longsheng Sihai New Materials Co., Ltd., model SH-5202N, the viscosity (25°C) is 30000cp, and the vinyl content is 0.5-3%.

[0083] Performance Testing

[0084] The peel strength of the special printing tapes obtained in the above Examples 1-3 and Comparative Examples 1-7 was measured with reference to Method 1 (Test method for 180° peel strength of adhesive tape and stainless steel plate) in the standard GB 2792-2014; the tapes were placed in an oven at 180°C for baking, and the time when the tapes were thermally peeled (viscousness disappeared) was recorded. Then, based on the time when the control group was thermally peeled, the ratio of the time when the special printing tapes obtained in Examples 1-3 and Comparative Examples 1-7 were thermally peeled to the time when the control group was thermally peeled was calculated, and recorded as the relative heat resistance time. The results are shown in Table 1.

[0085] Table 1: Peel strength and heat resistance test results

[0086]

[0087] It can be seen from the above performance test results that the special printing tapes prepared in Examples 1-3 have excellent peel strength, heat resistance and low temperature resistance, especially the comprehensive performance of the special printing tape in Example 1 is the most outstanding. This is because the present invention significantly improves the peel strength, heat resistance and low temperature resistance of the special printing tape by adopting specific modified acrylic resin and modified liquid silicone resin as the main components of the pressure-sensitive adhesive solution.

[0088] In comparison, since Comparative Examples 1-7 did not adopt the necessary technical solutions, their corresponding performance tests were significantly worse than those of Examples 1-3. No specific modified acrylic resin was used in Comparative Examples 1-3, and no modified liquid silicone resin prepared by a specific method was used in Comparative Examples 4-7. It can be seen from the results that the peel strength, heat resistance and low temperature resistance of the special printing tape were reduced. The above experimental results further prove the importance of the technical solution defined in the present invention for its technical effect.

[0089] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for preparing a special printing tape, characterized in that: The following steps are involved: S1, 80-100 parts by weight of modified acrylic resin, 5-15 parts by weight of modified liquid silicone resin, 10-30 parts by weight of diluent, 3-7 parts by weight of terpene phenol resin, 1-2 parts by weight of photoinitiator and 0.4-0.6 parts by weight of leveling agent are mixed uniformly to obtain a pressure-sensitive adhesive solution; The modified acrylic resin is obtained by reacting polyisobutylene, ethyl acrylate, hydroxypropyl acrylate, octadecyl methacrylate, pentaerythritol tetramethacrylate, pentaerythritol triacrylate and allyl tris(trimethylsiloxy)silane; S2, applying ink to one side of the substrate layer to form a printed layer; applying a pressure-sensitive adhesive solution to the other side of the substrate layer, and then curing it with ultraviolet light for 5-10 seconds to form a pressure-sensitive adhesive layer; thus, the printing tape is obtained; The polyisobutylene is produced by Daelim of South Korea, model number is PB1300; The preparation method of the modified liquid silicone resin comprises the following steps: 8-12 parts by weight of an inorganic filler is mixed with 40-50 parts by weight of toluene and 40-50 parts by weight of ethyl acetate, and then ultrasonically dispersed for 0.3-0.6 hours, and then 0.7-1 parts by weight of triethylsilyl chloride and 0.3-0.5 parts by weight of 7-octyldimethylsilyl chloride are added, stirred for 3-5 hours, filtered, and dried to obtain a surface-modified inorganic filler; Take 30-50 parts by weight of hexamethyldisiloxane, 10-20 parts by weight of mercaptopropyltrimethoxysilane, 4-6 parts by weight of mercaptoethyltriethoxysilane, 10-20 parts by weight of n-propyltriethoxysilane, 4-6 parts by weight of triethoxysilane, 7-10 parts by weight of water and 0.1-0.3 parts by weight of concentrated hydrochloric acid, mix them and stir to react for 10-30 minutes, then add 0.2-0.5 parts by weight of 1-hydroxycyclohexyl phenyl ketone, 1-3 parts by weight of surface-modified inorganic filler and 0.1-0.2 parts by weight of concentrated hydrochloric acid, stir to react for 20-40 minutes, and obtain a modified liquid silicone resin.

2. The method for preparing the special printing tape according to claim 1, characterized in that: The preparation method of the modified acrylic resin comprises the following steps: 40-60 parts by weight of toluene, 30-50 parts by weight of ethyl acetate and 8-12 parts by weight of polyisobutylene are mixed, stirred for 0.2-0.6h at 60-70°C, 100-250r / min and nitrogen atmosphere, and then 0.03-0.07 parts by weight of azobisisobutyronitrile are added and stirred for 2-3h; then the temperature is raised to 80-90°C, 10-15 parts by weight of ethyl acrylate, 6-10 parts by weight of hydroxypropyl acrylate, 10-15 parts by weight of octadecyl methacrylate, 6-10 parts by weight of pentaerythritol tetramethacrylate, 3-6 parts by weight of pentaerythritol triacrylate, 2-5 parts by weight of allyl tris(trimethylsiloxy)silane and 0.03-0.06 parts by weight of azobisisobutyronitrile are added and stirred for 4-6h to obtain a modified acrylic resin.

3. The method for preparing the special printing tape according to claim 2, characterized in that: The inorganic filler is composed of nano silicon dioxide and calcium sulfate whiskers in a weight ratio of 3:1-5.

4. The method for preparing the special printing tape according to claim 3, characterized in that: The preparation method of the modified liquid silicone resin comprises the following steps: 8-12 parts by weight of an inorganic filler is mixed with 40-50 parts by weight of toluene and 40-50 parts by weight of ethyl acetate, and ultrasonically dispersed for 0.3-0.6 hours at an ultrasonic frequency of 20-30 kHz and an ultrasonic power of 100-300 W, and then 0.7-1 parts by weight of triethylsilyl chloride and 0.3-0.5 parts by weight of 7-octyldimethylsilyl chloride are added, and stirred at 40-50° C. and 200-400 r / min for 3-5 hours, filtered, and dried to obtain a surface-modified inorganic filler; Take 30-50 parts by weight of hexamethyldisiloxane, 10-20 parts by weight of mercaptopropyltrimethoxysilane, 4-6 parts by weight of mercaptoethyltriethoxysilane, 10-20 parts by weight of n-propyltriethoxysilane, 4-6 parts by weight of triethoxysilane, 7-10 parts by weight of water and 0.1-0.3 parts by weight of 33-36wt% concentrated hydrochloric acid, stir and react at 40-50°C for 10-30min, filter to remove solid impurities, then add 0.2-0.5 parts by weight of 1-hydroxycyclohexylphenyl ketone, 1-3 parts by weight of surface-modified inorganic filler, 0.1-0.2 parts by weight of 33-36wt% concentrated hydrochloric acid, stir and react at 45-60°C for 20-40min, and evacuate at 80-90°C to remove low-boiling impurities to obtain a modified liquid silicone resin.

5. The method for preparing the special printing tape according to claim 1, characterized in that: The thickness of the substrate layer is 40-60 μm; the thickness of the printing layer is 4-6 μm; and the thickness of the pressure-sensitive adhesive layer is 20-30 μm.

6. The method for preparing the special printing tape according to claim 1, characterized in that: The diluent is any one of toluene, N,N-dimethylformamide and N-methylpyrrolidone.

7. The method for preparing the special printing tape according to claim 1, characterized in that: The photoinitiator is any one of photoinitiator 2959, photoinitiator 1173, photoinitiator 6992, photoinitiator 819, and photoinitiator 307.

8. The method for preparing the special printing tape according to claim 1, characterized in that: The leveling agent is any one of BYK331 leveling agent, BYK349 ​​leveling agent, TEGO410 leveling agent and TEGO450 leveling agent.

9. A special printing tape prepared according to the method according to any one of claims 1 to 8.

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