High-viscosity and easy-to-peel adhesive and preparation method thereof

Abstract

The invention discloses a high-viscosity and easy-to-peel adhesive and a preparation method of the high-viscosity and easy-to-peel adhesive, and relates to the technical field of adhesives. Comprising the following components in parts by weight: 45-65 parts of an acrylate copolymer, 10-20 parts of tackifying resin, 5-15 parts of a stripping accelerator, 3-5 parts of a curing agent, 0.5-1.5 parts of a photoinitiator, 0.6-1 part of tris (2-acryloyloxyethyl) isocyanurate, 3-6 parts of carboxyl modified nanofiller and 10-20 parts of a solvent, the acrylate copolymer comprises a structural unit introduced by free radical polymerization of the following monomers: acrylic acid, butyl acrylate, hydroxyethyl methylacrylate and other polymerizable monomers. The adhesive is sufficient in viscidity, firm in combination with a base material, easy to peel off and small in residual adhesive amount.

Description

Technical Field

[0001] The present invention relates to the technical field of adhesives, and particularly to a highly viscous and easily peelable adhesive and a preparation method thereof. Background Art

[0002] In many industrial fields and daily life, adhesives play a crucial role. With the continuous development of technology and the increasing diversification of application scenarios, the requirements for the performance of adhesives are becoming more and more stringent. In the industrial and consumer fields, adhesives need to simultaneously meet the characteristics of high bonding strength and easy peelability. For example, in scenarios such as the temporary fixation of screens in electronic devices and the detachable bonding of automotive interior parts, the adhesive needs to not only firmly bond the substrate but also achieve residue-free peeling under specific conditions (such as temperature and external force). However, currently commercially available adhesives (such as acrylate-based and polyurethane-based adhesives) generally have the problem that it is difficult to balance the bonding strength and the peeling performance.

[0003] To solve the above problems, researchers in the industry have made a large number of attempts. For example, by adding a release agent (such as silicone oil and fluorocarbon surfactant) to reduce the peeling force, but the bonding strength will be significantly weakened. Another study uses a microsphere foaming structure or physical crosslinking to achieve controllable peeling, but the process is complex and costly, and the heat resistance is poor (the microspheres rupture and fail at > 80°C). There is also the use of dynamic covalent bonds (such as Diels - Alder bonds and hydrogen bonds) to endow the adhesive with reversible adhesiveness. However, such systems often require specific triggering conditions (such as light and pH value), and the stability of the dynamic bonds is insufficient, resulting in a significant decrease in the bonding strength after long-term use.

[0004] For example, the Chinese invention patent with the application publication number CN116042165A discloses a highly elastic and easily peelable cured adhesive, and its raw material ratio is as follows: 20 - 35 parts of prepolymer, 70 - 100 parts of monomer ester, 2 - 3 parts of photoinitiator, and 1 part of antioxidant; the prepolymer includes the following components: 33 - 60 parts of isocyanate, 100 parts of polyether polyol, 1 part of tin catalyst, and 33 - 40 parts of acrylate. The invention also provides a preparation method of a highly elastic and easily peelable cured adhesive. The purpose of this invention is to solve the technical problem that the existing UV-cured adhesive as an intermediate layer (bonding layer) cannot be completely peeled off from the product, which thus limits its wide use in the field of optical materials, thereby enhancing the elasticity and easy peelability of the UV-cured adhesive, and having excellent comprehensive properties such as high strength, good toughness, and wear resistance. However, the viscosity of this adhesive still needs to be further improved, and the easy peelability still needs to be further improved.

[0005] It can be seen that there is still a need in this field for a highly viscous and easily peelable adhesive with sufficient viscosity, firm bonding with the substrate, easy peeling, and less residual glue, as well as a preparation method thereof. Summary of the Invention

[0006] The main object of the present invention is to provide a highly viscous and easily peelable adhesive with sufficient viscosity, firm bonding to the substrate, easy peeling, and less residual glue, and a preparation method thereof.

[0007] To achieve the above object, the present invention provides a highly viscous and easily peelable adhesive, which comprises the following components by weight: 45-65 parts of acrylate copolymer, 10-20 parts of tackifying resin, 5-15 parts of peeling promoter, 3-5 parts of curing agent, 0.5-1.5 parts of photoinitiator, 0.6-1 part of tris(2-acryloyloxyethyl) isocyanurate, 3-6 parts of carboxyl-modified nano filler, and 10-20 parts of solvent; the acrylate copolymer comprises structural units introduced by free radical polymerization of the following monomers: acrylic acid, butyl acrylate, 2-hydroxyethyl methacrylate, and other polymerizable monomers.

[0008] Preferably, the other polymerizable monomers are a mixture of diphenyl(4-vinylphenyl)phosphine oxide, bis(trimethylsilyl)vinyl phosphate, and dicyclopentenyloxyethyl methacrylate in a mass ratio of (1-3):1:(0.8-1.2).

[0009] Preferably, the preparation method of the acrylate copolymer comprises the following steps: adding acrylic acid, butyl acrylate, 2-hydroxyethyl methacrylate, other polymerizable monomers, and an initiator into an organic solvent, and stirring and reacting at 60-70 °C for 3-6 h in an inert gas atmosphere to obtain the acrylate copolymer.

[0010] Preferably, the mass ratio of acrylic acid, butyl acrylate, 2-hydroxyethyl methacrylate, other polymerizable monomers, initiator, and organic solvent is 0.5:(0.8-1.2):1:(0.3-0.5):(0.03-0.05):(9-15).

[0011] Preferably, the initiator is azobisisobutyronitrile; the inert gas is at least one of nitrogen, helium, neon, and argon; the organic solvent is ethyl acetate.

[0012] Preferably, the tackifying resin is at least one of hydrogenated rosin glyceride, C5 petroleum resin, and terpene resin T-100.

[0013] Preferably, the peeling promoter comprises the following components by weight: 10-20 parts of diisocyanate polyethylene glycol and 8-14 parts of carboxyvinyl silicone oil.

[0014] Preferably, the M of the diisocyanate polyethylene glycol n = 400, provided by Guangdong Wengjiang Chemical Reagent Co., Ltd.; the product parameters of the carboxyvinyl silicone oil are SCV-1098, provided by Yuyao Huihong Plastic Factory.

[0015] Preferably, the curing agent is aziridine crosslinking agent XR-100.

[0016] Preferably, the photoinitiator is benzoin ethyl ether.

[0017] Preferably, the carboxyl-modified nanofiller is a carboxylated multi-walled carbon nanotube with a particle size of 8 nm, provided by Xi'an Qiyue Biotechnology Co., Ltd.

[0018] Preferably, the solvent is any one of ethyl acetate and acetone.

[0019] Another object of the present invention is to provide a method for preparing the highly viscous and easily peelable adhesive, comprising the following steps: uniformly mixing the components by weight, stirring at 50-60° C. for 1-2 hours, filtering through a 200-mesh filter, and discharging the material after defoaming to obtain a highly viscous and easily peelable adhesive.

[0020] Due to the application of the above technical solution, the present invention has the following beneficial effects: (1) The method for preparing the high-viscosity and easy-to-peel adhesive disclosed in the present invention has simple process, convenient operation and control, low dependence on equipment, mild conditions, high preparation efficiency and finished product qualification rate, is suitable for large-scale industrial production, and has very good practical value.

[0021] (2) The high-viscosity and easily peelable adhesive disclosed in the present invention comprises the following components in parts by weight: 45-65 parts of an acrylate copolymer, 10-20 parts of a tackifying resin, 5-15 parts of a peeling accelerator, 3-5 parts of a curing agent, 0.5-1.5 parts of a photoinitiator, 0.6-1 parts of tris(2-acryloxyethyl)isocyanurate, 3-6 parts of a carboxyl-modified nanofiller, and 10-20 parts of a solvent; the acrylate copolymer comprises structural units introduced by free radical polymerization of the following monomers: acrylic acid, butyl acrylate, hydroxyethyl methacrylate, and other polymerizable monomers. Through the mutual cooperation and joint action of the components, the prepared high-viscosity and easy-to-peel adhesive has sufficient viscosity, is firmly bonded to the substrate, is easy to peel, and has a small amount of residual adhesive; the other polymerizable monomers are prepared by mixing diphenyl (4-vinylphenyl) phosphine oxide, bistrimethylsilyl vinyl phosphate, and dicyclopentene methacrylate in a mass ratio of (1-3):1:(0.8-1.2); through the reasonable selection of monomer types and usage ratios, a specific acrylic ester copolymer is formed, and the added tackifying resin, curing agent, tris (2-acryloyloxyethyl) isocyanurate and carboxyl-modified nano filler cooperate to form a stable three-dimensional network structure of the adhesive, thereby greatly improving the viscosity of the adhesive.

[0022] (3) The highly viscous and easily peelable adhesive disclosed by the present invention, the release promoter comprises the following components by weight: 10-20 parts of diisocyanate polyethylene glycol, 8-14 parts of carboxyl vinyl silicone oil. The diisocyanate polyethylene glycol contains terminal isocyanate groups (-NCO), which form reversible crosslinks with the hydroxyl or carboxyl groups in the acrylate copolymer, reducing the peel force; achieving a dynamic balance between bonding strength and peelability; the carboxyl vinyl silicone oil forms a microscopic isolation layer inside the adhesive; when peeling is required, it can effectively reduce the adhesion between the adhesive and the adherend, achieving easy peeling, and there is basically no residual adhesive on the surface of the adherend after peeling.

[0023] (4) The highly viscous and easily peelable adhesive disclosed by the present invention, the carboxyl-modified nano filler added is carboxylated multi-walled carbon nanotubes, which are compounded with other components, and through the synergistic effect of nano particle enhanced cohesion and interfacial weak layer, effectively solve the contradiction between bonding / peeling, making the prepared adhesive not only highly viscous but also easily peelable and removable.

[0024] (5) The highly viscous and easily peelable adhesive disclosed by the present invention, the components containing carboxyl can undergo crosslinking and curing reactions with the aziridine crosslinking agent XR-100, and at the same time, the components containing unsaturated double bonds can undergo copolymerization and curing reactions under the action of a photoinitiator, so that a multiple interpenetrating network structure is introduced into the adhesive film at the same time, effectively improving the viscosity and easy peelability. Detailed implementation manners

[0025] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments in the following description are only examples, and other obvious variations can be thought of by those skilled in the art. Example 1

[0026] A highly viscous and easily peelable adhesive, by weight, comprises the following components: 45 parts of acrylate copolymer, 10 parts of tackifying resin, 5 parts of release promoter, 3 parts of curing agent, 0.5 part of photoinitiator, 0.6 part of tris(2-acryloyloxyethyl) isocyanurate, 3 parts of carboxyl-modified nano filler, 10 parts of solvent; the acrylate copolymer comprises structural units introduced by free radical polymerization of the following monomers: acrylic acid, butyl acrylate, 2-hydroxyethyl methacrylate, other polymerizable monomers; the other polymerizable monomers are composed of diphenyl(4-vinylphenyl)phosphine oxide, bis(trimethylsilyl)vinyl phosphate, dicyclopentene methacrylate mixed in a mass ratio of 1:1:0.8.

[0027] The preparation method of the acrylic acid ester copolymer comprises the following steps: adding acrylic acid, butyl acrylate, hydroxyethyl methacrylate, other polymerizable monomers and an initiator into an organic solvent, stirring and reacting at 60° C. for 3 hours in an inert gas range to obtain the acrylic acid ester copolymer; the mass ratio of the acrylic acid, butyl acrylate, hydroxyethyl methacrylate, other polymerizable monomers, initiator and organic solvent is 0.5:0.8:1:0.3:0.03:9; the initiator is azobisisobutyronitrile; the inert gas is nitrogen; and the organic solvent is ethyl acetate.

[0028] The tackifying resin is hydrogenated rosin glycerol ester; the peeling accelerator includes the following components by weight: 10 parts of diisocyanate polyethylene glycol and 8 parts of carboxyl vinyl silicone oil; n =400, provided by Guangdong Wengjiang Chemical Reagent Co., Ltd.; the product parameter of the carboxyvinyl silicone oil is SCV-1098, provided by Yuyao Huihong Plastic Factory.

[0029] The curing agent is aziridine crosslinking agent XR-100; the photoinitiator is benzoin ethyl ether; the carboxyl-modified nanofiller is carboxylated multi-walled carbon nanotubes with a particle size of 8 nm, provided by Xi'an Qiyue Biotechnology Co., Ltd.; and the solvent is ethyl acetate.

[0030] A preparation method of the highly viscous and easily peelable adhesive comprises the following steps: uniformly mixing the components by weight, stirring at 50° C. for 1 hour, filtering through a 200-mesh filter, and discharging the material after defoaming to obtain the highly viscous and easily peelable adhesive. Example 2

[0031] A high-viscosity and easily peelable adhesive comprises the following components in parts by weight: 50 parts of an acrylate copolymer, 13 parts of a tackifying resin, 7 parts of a peeling accelerator, 3.5 parts of a curing agent, 0.8 parts of a photoinitiator, 0.7 parts of tris(2-acryloyloxyethyl)isocyanurate, 4 parts of a carboxyl-modified nanofiller, and 12 parts of a solvent; the acrylate copolymer comprises structural units introduced by free radical polymerization of the following monomers: acrylic acid, butyl acrylate, hydroxyethyl methacrylate, and other polymerizable monomers; the other polymerizable monomers are prepared by mixing diphenyl(4-vinylphenyl)phosphine oxide, bistrimethylsilyl vinyl phosphate, and dicyclopentene methacrylate in a mass ratio of 1.5:1:0.9.

[0032] The preparation method of the acrylic acid ester copolymer comprises the following steps: adding acrylic acid, butyl acrylate, hydroxyethyl methacrylate, other polymerizable monomers and an initiator into an organic solvent, stirring and reacting at 63° C. for 4 hours in an inert gas range to obtain the acrylic acid ester copolymer; the mass ratio of the acrylic acid, butyl acrylate, hydroxyethyl methacrylate, other polymerizable monomers, initiator and organic solvent is 0.5:0.9:1:0.35:0.035:11; the initiator is azobisisobutyronitrile; the inert gas is helium; and the organic solvent is ethyl acetate.

[0033] The tackifying resin is C5 petroleum resin; the stripping accelerator includes the following components in parts by weight: 13 parts of diisocyanate polyethylene glycol and 10 parts of carboxyl vinyl silicone oil; the Mn of the diisocyanate polyethylene glycol is 400, which is provided by Guangdong Wengjiang Chemical Reagent Co., Ltd.; the product parameter of the carboxyl vinyl silicone oil is SCV-1098, which is provided by Yuyao Huihong Plastic Factory; the curing agent is aziridine crosslinking agent XR-100; the photoinitiator is benzoin ethyl ether; the carboxyl-modified nanofiller is carboxylated multi-walled carbon nanotubes with a particle size of 8 nm, which are provided by Xi'an Qiyue Biotechnology Co., Ltd.; the solvent is acetone.

[0034] A method for preparing the highly viscous and easily peelable adhesive comprises the following steps: uniformly mixing the components by weight, stirring at 53° C. for 1.2 hours, filtering through a 200-mesh filter, and discharging the material after defoaming to obtain the highly viscous and easily peelable adhesive. Example 3

[0035] A high-viscosity and easily peelable adhesive comprises the following components in parts by weight: 55 parts of an acrylate copolymer, 15 parts of a tackifying resin, 10 parts of a peeling accelerator, 4 parts of a curing agent, 1 part of a photoinitiator, 0.8 parts of tris(2-acryloyloxyethyl)isocyanurate, 4.5 parts of a carboxyl-modified nanofiller, and 15 parts of a solvent; the acrylate copolymer comprises structural units introduced by free radical polymerization of the following monomers: acrylic acid, butyl acrylate, hydroxyethyl methacrylate, and other polymerizable monomers; the other polymerizable monomers are prepared by mixing diphenyl(4-vinylphenyl)phosphine oxide, bistrimethylsilyl vinyl phosphate, and dicyclopentene methacrylate in a mass ratio of 2:1:1.

[0036] The preparation method of the acrylic acid ester copolymer comprises the following steps: adding acrylic acid, butyl acrylate, hydroxyethyl methacrylate, other polymerizable monomers and an initiator into an organic solvent, stirring and reacting at 65° C. for 4.5 hours in an inert gas range to obtain the acrylic acid ester copolymer; the mass ratio of the acrylic acid, butyl acrylate, hydroxyethyl methacrylate, other polymerizable monomers, the initiator and the organic solvent is 0.5:1:1:0.4:0.04:12; the initiator is azobisisobutyronitrile; the inert gas is neon; and the organic solvent is ethyl acetate.

[0037] The tackifying resin is terpene resin T-100; the stripping accelerator includes the following components in parts by weight: 15 parts of diisocyanate polyethylene glycol and 12 parts of carboxyl vinyl silicone oil; the Mn of the diisocyanate polyethylene glycol is 400, which is provided by Guangdong Wengjiang Chemical Reagent Co., Ltd.; the product parameter of the carboxyl vinyl silicone oil is SCV-1098, which is provided by Yuyao Huihong Plastic Factory; the curing agent is aziridine crosslinking agent XR-100; the photoinitiator is benzoin ethyl ether; the carboxyl-modified nanofiller is carboxylated multi-walled carbon nanotubes with a particle size of 8 nm, which are provided by Xi'an Qiyue Biotechnology Co., Ltd.; the solvent is ethyl acetate.

[0038] A method for preparing the highly viscous and easily peelable adhesive comprises the following steps: uniformly mixing the components by weight, stirring at 55° C. for 1.5 hours, filtering through a 200-mesh filter, and discharging the material after defoaming to obtain the highly viscous and easily peelable adhesive. Example 4

[0039] A high-viscosity and easily peelable adhesive comprises the following components in parts by weight: 60 parts of an acrylate copolymer, 18 parts of a tackifying resin, 14 parts of a peeling accelerator, 4.5 parts of a curing agent, 1.3 parts of a photoinitiator, 0.9 parts of tris(2-acryloyloxyethyl)isocyanurate, 5.5 parts of a carboxyl-modified nanofiller, and 18 parts of a solvent; the acrylate copolymer comprises structural units introduced by free radical polymerization of the following monomers: acrylic acid, butyl acrylate, hydroxyethyl methacrylate, and other polymerizable monomers; the other polymerizable monomers are prepared by mixing diphenyl(4-vinylphenyl)phosphine oxide, bistrimethylsilyl vinyl phosphate, and dicyclopentene methacrylate in a mass ratio of 2.5:1:1.1.

[0040] The preparation method of the acrylic acid ester copolymer comprises the following steps: adding acrylic acid, butyl acrylate, hydroxyethyl methacrylate, other polymerizable monomers and an initiator into an organic solvent, stirring and reacting at 68° C. for 5.5 hours in an inert gas range to obtain the acrylic acid ester copolymer; the mass ratio of the acrylic acid, butyl acrylate, hydroxyethyl methacrylate, other polymerizable monomers, the initiator and the organic solvent is 0.5:1.1:1:0.45:0.045:14; the initiator is azobisisobutyronitrile; the inert gas is argon; and the organic solvent is ethyl acetate.

[0041] The tackifying resin is a mixture of hydrogenated rosin glycerol ester, C5 petroleum resin, and terpene resin T-100 in a mass ratio of 1:2:1; the stripping accelerator includes the following components in parts by weight: 18 parts of diisocyanate polyethylene glycol and 13 parts of carboxyl vinyl silicone oil; the Mn of the diisocyanate polyethylene glycol is 400, which is provided by Guangdong Wengjiang Chemical Reagent Co., Ltd.; the product parameter of the carboxyl vinyl silicone oil is SCV-1098, which is provided by Yuyao Huihong Plastic Factory; the curing agent is aziridine crosslinking agent XR-100; the photoinitiator is benzoin ethyl ether; the carboxyl-modified nanofiller is a carboxylated multi-walled carbon nanotube with a particle size of 8 nm, which is provided by Xi'an Qiyue Biotechnology Co., Ltd.; the solvent is a mixture of ethyl acetate and acetone in a mass ratio of 1:1.

[0042] A method for preparing the highly viscous and easily peelable adhesive comprises the following steps: uniformly mixing the components by weight, stirring at 58° C. for 1.8 hours, filtering through a 200-mesh filter, and discharging the material after defoaming to obtain the highly viscous and easily peelable adhesive. Example 5

[0043] A high-viscosity and easily peelable adhesive comprises the following components in parts by weight: 65 parts of an acrylate copolymer, 20 parts of a tackifying resin, 15 parts of a peeling accelerator, 5 parts of a curing agent, 1.5 parts of a photoinitiator, 1 part of tris(2-acryloyloxyethyl)isocyanurate, 6 parts of a carboxyl-modified nanofiller, and 20 parts of a solvent; the acrylate copolymer comprises structural units introduced by free radical polymerization of the following monomers: acrylic acid, butyl acrylate, hydroxyethyl methacrylate, and other polymerizable monomers; the other polymerizable monomers are prepared by mixing diphenyl(4-vinylphenyl)phosphine oxide, bistrimethylsilyl vinyl phosphate, and dicyclopentene methacrylate in a mass ratio of 3:1:1.2.

[0044] The preparation method of the acrylic acid ester copolymer comprises the following steps: adding acrylic acid, butyl acrylate, hydroxyethyl methacrylate, other polymerizable monomers and an initiator into an organic solvent, stirring and reacting at 70° C. for 6 hours in an inert gas range to obtain the acrylic acid ester copolymer; the mass ratio of the acrylic acid, butyl acrylate, hydroxyethyl methacrylate, other polymerizable monomers, initiator and organic solvent is 0.5:1.2:1:0.5:0.05:15; the initiator is azobisisobutyronitrile; the inert gas is nitrogen; and the organic solvent is ethyl acetate.

[0045] The tackifying resin is hydrogenated rosin glycerol ester; the stripping accelerator includes the following components in parts by weight: 20 parts of diisocyanate polyethylene glycol and 14 parts of carboxyl vinyl silicone oil; the Mn of the diisocyanate polyethylene glycol is 400, which is provided by Guangdong Wengjiang Chemical Reagent Co., Ltd.; the product parameter of the carboxyl vinyl silicone oil is SCV-1098, which is provided by Yuyao Huihong Plastic Factory; the curing agent is aziridine crosslinking agent XR-100; the photoinitiator is benzoin ethyl ether; the carboxyl-modified nanofiller is carboxylated multi-walled carbon nanotubes with a particle size of 8 nm, which is provided by Xi'an Qiyue Biotechnology Co., Ltd.; the solvent is ethyl acetate.

[0046] A method for preparing the highly viscous and easily peelable adhesive comprises the following steps: uniformly mixing the components by weight, stirring at 60° C. for 2 hours, filtering through a 200-mesh filter, and discharging the material after defoaming to obtain the highly viscous and easily peelable adhesive.

[0047] Comparative Example 1 A high-viscosity and easily peelable adhesive and a preparation method thereof, which are substantially the same as those in Example 1, except that tris(2-acryloyloxyethyl)isocyanurate and carboxyl-modified nanofiller are not added.

[0048] Comparative Example 2 A high-viscosity and easily peelable adhesive and a preparation method thereof, which are substantially the same as those in Example 1, except that no other polymerizable monomers and diisocyanate polyethylene glycol are added.

[0049] In order to further illustrate the beneficial technical effects of the high-viscosity and easy-to-peel adhesives involved in each embodiment of the present invention, relevant performance tests were carried out on the high-viscosity and easy-to-peel adhesives involved in Examples 1-5 and Comparative Examples 1-2. The test results are shown in Table 1. The test method is as follows: The adhesives prepared in the above embodiments and comparative examples were respectively coated on a PO substrate with a thickness of 100 μm, and the coating amount was 30 g / cm 2 , baked at 80°C for 5 min to form a uniform coating with a thickness of 12 μm to obtain an adhesive tape; 1. Initial adhesion: Tested in accordance with GB / T 4852-2002.

[0050] 2. Peel performance test: The test was carried out with reference to GB / T 2792-2014 to measure the 180° peel strength of the tape after curing from the stainless steel plate; and visually observed whether there was residual glue after peeling; Curing conditions: Using a 110W / cm high-pressure mercury lamp, irradiating at room temperature for 50 seconds, and then heat-treating at 85°C for 5 minutes.

[0051] Table 1 Performance test results of high-viscosity and easy-peeling adhesives Project Initial Adhesion Force Peel Strength Residual Adhesive after Peeling Unit Steel Ball No. N / cm — Example 1 18 1.2 No Residual Adhesive Example 2 20 0.9 No Residual Adhesive Example 3 21 0.7 No Residual Adhesive Example 4 21 0.6 No Residual Adhesive Example 5 23 0.4 No Residual Adhesive Comparative Example 1 14 2.0 Residual Adhesive Comparative Example 2 16 2.4 Residual Adhesive As can be seen from Table 1, the high-viscosity and easy-peeling adhesive disclosed in the embodiments of the present invention has higher viscosity, better easy-peeling performance, and no residual glue after peeling than the products of the comparative examples; The combined use of tris(2-acryloyloxyethyl) isocyanurate, carboxyl-modified nano-fillers, other polymerizable monomers and diisocyanate polyethylene glycol is beneficial to improving the above properties.

[0052] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and what is described in the above embodiments and the specification is only the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-viscosity and easily peelable adhesive, characterized in that: The invention comprises the following components in parts by weight: 45-65 parts of acrylate copolymer, 10-20 parts of tackifying resin, 5-15 parts of peeling accelerator, 3-5 parts of curing agent, 0.5-1.5 parts of photoinitiator, 0.6-1 parts of tris(2-acryloxyethyl)isocyanurate, 3-6 parts of carboxyl-modified nanofiller and 10-20 parts of solvent; the acrylate copolymer comprises structural units introduced by free radical polymerization of the following monomers: acrylic acid, butyl acrylate, hydroxyethyl methacrylate and other polymerizable monomers.

2. The high-viscosity and easily peelable adhesive according to claim 1, characterized in that: The other polymerizable monomers are prepared by mixing diphenyl (4-vinylphenyl) phosphine oxide, bistrimethylsilyl vinyl phosphate and dicyclopentene methacrylate in a mass ratio of (1-3):1:(0.8-1.2).

3. The high-viscosity and easily peelable adhesive according to claim 1, characterized in that: The preparation method of the acrylic ester copolymer comprises the following steps: adding acrylic acid, butyl acrylate, hydroxyethyl methacrylate, other polymerizable monomers and an initiator into an organic solvent, stirring and reacting at 60-70° C. in an inert gas range for 3-6 hours to obtain the acrylic ester copolymer.

4. The high-viscosity and easily peelable adhesive according to claim 3, characterized in that: The mass ratio of acrylic acid, butyl acrylate, hydroxyethyl methacrylate, other polymerizable monomers, initiator and organic solvent is 0.5:(0.8-1.2):1:(0.3-0.5):(0.03-0.05):(9-15).

5. The high-viscosity and easily peelable adhesive according to claim 3, characterized in that: The initiator is azobisisobutyronitrile; the inert gas is at least one of nitrogen, helium, neon and argon; and the organic solvent is ethyl acetate.

6. The high-viscosity and easily peelable adhesive according to claim 1, characterized in that: The tackifying resin is at least one of hydrogenated rosin glycerol ester, C5 petroleum resin, and terpene resin T-100.

7. The high-viscosity and easily peelable adhesive according to claim 1, characterized in that: The stripping accelerator comprises the following components by weight: 10-20 parts of diisocyanate polyethylene glycol and 8-14 parts of carboxyl vinyl silicone oil; n =400.

8. The high-viscosity and easily peelable adhesive according to claim 1, characterized in that: The curing agent is aziridine crosslinking agent XR-100; the photoinitiator is benzoin ethyl ether; the carboxyl-modified nanofiller is carboxylated multi-walled carbon nanotubes with a particle size of 8 nm; and the solvent is any one of ethyl acetate and acetone.

9. A method for preparing the high-viscosity and easily peelable adhesive according to any one of claims 1 to 8, characterized in that: The method comprises the following steps: uniformly mixing the components according to weight, stirring at 50-60° C. for 1-2 hours, filtering through a 200-mesh filter, and discharging the material after defoaming to obtain a highly viscous and easily peelable adhesive.