Rubber Structure Dispersant and Its Preparation Method, Rubber Adhesive and Termination Tape

Abstract

The present invention discloses a rubber structure dispersant, a preparation method thereof, a rubber adhesive and a termination tape. The rubber structure dispersant of the present invention is prepared by reacting a polybutadiene grafted polyethylene glycol copolymer with a trimethylhexamethylene diisocyanate partially blocked with aziridine. The components of the rubber adhesive of the present invention include a carboxyl-terminated polybutadiene acrylonitrile rubber, a carboxyl-terminated polybutadiene rubber, a polyisobutylene rubber, a tackifying resin, a rubber structure dispersant, an inorganic pigment and an organic solvent. The rubber structure dispersant of the present invention has a good dispersion effect on inorganic pigments and good compatibility with the rubber adhesive system, and the finally obtained colored termination tape has good high-voltage electrolyte resistance performance and is suitable for use in high-energy density lithium-ion batteries.

Description

Technical Field

[0001] The present invention relates to the technical field of termination tapes, and specifically relates to a rubber structure dispersant and its preparation method, a rubber adhesive, and a termination tape. Background Art

[0002] In the assembly and production process of lithium-ion batteries, special tapes are generally required to fix, insulate, and protect the battery cores, electrode tabs, termination parts, etc. of lithium-ion batteries. There are many types of special tapes for lithium-ion batteries, which can be mainly divided into acrylate, rubber, and other hybrid systems according to the main materials. The composition of rubber-based pressure-sensitive adhesives includes rubber elastomers, tackifiers, softeners, anti-aging agents, etc. It has many advantages such as low polarity, good chemical resistance, and excellent electrolyte resistance, and has good application prospects. However, the rubber-based pressure-sensitive adhesive has poor adhesion to the substrate, and the compatibility between the adhesive system and the color paste is not good. The quality of the product is unstable and it is difficult to fully meet the actual application requirements. At present, dispersants are mainly added to improve the compatibility between the color paste and the adhesive system, but since the dispersant is easily migrated into the electrolyte, it will ultimately affect the safety of lithium-ion batteries.

[0003] Therefore, it is of great significance to develop rubber structure dispersants, rubber adhesives, and termination tapes with more excellent performance.

[0004] The above statements only provide background information related to the present invention and do not necessarily constitute prior art. Summary of the Invention

[0005] The purpose of the present invention is to provide a rubber structure dispersant and its preparation method, a rubber adhesive, and a termination tape.

[0006] The technical solution adopted by the present invention is as follows:

[0007] A rubber structure dispersant is prepared by reacting a polybutadiene grafted polyethylene glycol copolymer and trimethylhexamethylene diisocyanate partially blocked with aziridine in a mass ratio of 1:0.3 to 0.5; the polybutadiene grafted polyethylene glycol copolymer is prepared by reacting epoxidized hydroxyl-terminated polybutadiene and O-(2-mercaptoethyl)-O'-methyl-poly(ethylene glycol) in a mass ratio of 1:0.3 to 0.4; the trimethylhexamethylene diisocyanate partially blocked with aziridine is prepared by reacting 1-hydroxyethyl aziridine and trimethylhexamethylene diisocyanate in a mass ratio of 1:2.2 to 2.6.

[0008] Preferably, the content of epoxy groups in the epoxidized hydroxyl-terminated polybutadiene is 1.0 mmol / g to 2.4 mmol / g, and the content of hydroxyl groups is 0.3 mmol / g to 1.0 mmol / g.

[0009] Preferably, the number-average molecular weight of the O-(2-mercaptoethyl)-O'-methyl-poly(ethylene glycol) is 200 to 2,000.

[0010] A preparation method of the rubber structure dispersant as described above includes the following steps:

[0011] 1) Disperse 1-hydroxyethyl aziridine and trimethyl hexane diisocyanate in an organic solvent for reaction to obtain trimethyl hexane diisocyanate partially blocked with aziridine;

[0012] 2) Disperse epoxy-terminated hydroxyl polybutadiene, O-(2-mercaptoethyl)-O'-methyl-poly(ethylene glycol) and a catalyst in an organic solvent for reaction to obtain a polybutadiene grafted polyethylene glycol copolymer;

[0013] 3) Disperse the trimethyl hexane diisocyanate partially blocked with aziridine and the polybutadiene grafted polyethylene glycol copolymer in an organic solvent for reaction to obtain the rubber structure dispersant.

[0014] Preferably, the organic solvent in steps 1), 2) and 3) is at least one of toluene, chloroform and dichloromethane.

[0015] Preferably, the reaction in step 1) is carried out at 50°C to 80°C for 3 h to 5 h.

[0016] Preferably, the catalyst in step 2) is at least one of tetrabutylammonium fluoride, benzyltriethylammonium chloride and triethylamine.

[0017] Preferably, the reaction in step 2) is carried out at 40°C to 80°C for 3 h to 10 h.

[0018] Preferably, the reaction in step 3) is carried out at 50°C to 90°C for 3 h to 10 h.

[0019] A rubber adhesive, which comprises the following components in parts by mass:

[0020] Carboxyl-terminated polybutadiene acrylonitrile rubber: 100 parts;

[0021] Carboxyl-terminated polybutadiene rubber: 60 parts to 200 parts;

[0022] Polyisobutene rubber: 300 parts to 1,000 parts;

[0023] Tackifying resin: 40 parts to 100 parts;

[0024] The above rubber structure dispersant: 40 parts to 100 parts;

[0025] Inorganic pigment: 20 parts to 100 parts;

[0026] Organic solvent: 100 parts to 1300 parts.

[0027] Preferably, the content of carboxyl groups in the carboxyl-terminated polybutadiene acrylonitrile rubber is 0.3 mmol / g to 0.5 mmol / g, and the mass percentage content of cyano groups is 22% to 26%.

[0028] Preferably, the content of carboxyl groups in the carboxyl-terminated polybutadiene rubber is 0.3 mmol / g to 0.5 mmol / g.

[0029] Preferably, the weight average molecular weight of the polyisobutene rubber is 500,000 to 1,200,000.

[0030] Preferably, the tackifying resin is at least one of terpene resin and C9 petroleum resin.

[0031] Preferably, the inorganic pigment is cobalt green.

[0032] Preferably, the particle size of the inorganic pigment is 1 μm to 100 μm.

[0033] Preferably, the organic solvent is at least one of toluene, chloroform, and dichloromethane.

[0034] A method for preparing the rubber adhesive as described above includes the following steps: mixing a rubber structural dispersant, an inorganic pigment, and a part of the organic solvent for grinding, and then adding the carboxyl-terminated polybutadiene acrylonitrile rubber, carboxyl-terminated polybutadiene rubber, polyisobutene rubber, tackifying resin, and the remaining organic solvent and mixing evenly to obtain the rubber adhesive.

[0035] A termination tape includes a release layer, a base film, and an adhesive layer stacked in sequence; the adhesive layer contains the above rubber adhesive.

[0036] Preferably, the release layer contains a non-silicon release agent.

[0037] Preferably, the non-silicon release agent is the non-silicon release agent RL-600 of Guangzhou Meigu Chemical Co., Ltd.

[0038] Preferably, the thickness of the release layer is 0.2 μm to 2 μm.

[0039] Preferably, the base film is a polyethylene terephthalate film.

[0040] Preferably, the thickness of the base film is 5 μm to 20 μm.

[0041] Preferably, the thickness of the adhesive layer is 3 μm to 15 μm.

[0042] A method for preparing the termination tape as described above includes the following steps:

[0043] 1) Coat the release agent on one side of the base film, and then cure it to form a release layer;

[0044] 2) Coat the rubber adhesive on the other side of the base film, and then cure it to form an adhesive layer, thus obtaining the termination tape.

[0045] Preferably, the curing in step 1) is carried out at 100°C to 200°C, and the curing time is 2 min to 10 min.

[0046] Preferably, the curing in step 2) is carried out at 100°C to 200°C, and the curing time is 2 min to 10 min.

[0047] The beneficial effects of the present invention are as follows: The rubber structure dispersant of the present invention has a good dispersion effect on inorganic pigments and good compatibility with the rubber adhesive system. The finally obtained colored termination tape has good high-voltage electrolyte resistance performance and is suitable for high-energy density lithium-ion batteries.

[0048] Specifically:

[0049] 1) The present invention synthesizes a rubber-type dispersant with a new structure, which can efficiently disperse inorganic pigments. Applying it to the rubber adhesive system can well solve the problem of difficult dispersion of inorganic pigments;

[0050] 2) The rubber structure dispersant of the present invention contains aziridine functional groups, which can enable the rubber to be efficiently crosslinked to form a three-dimensional network structure, thereby enhancing the cohesion of the rubber. At the same time, it also solves the problem that small molecule dispersants are easy to precipitate and pollute the electrolyte;

[0051] 3) The termination tape of the present invention has good high-voltage electrolyte resistance performance, is suitable for high-energy density lithium-ion batteries, and has broad application prospects. Description of the Drawings

[0052] Figure 1 It is the synthesis route diagram of the rubber structure dispersant of the present invention.

[0053] Figure 2 It is the optical microscope photograph of the termination tapes of Examples 1 to 4 and the comparative example. Detailed Embodiments

[0054] The present invention will be further explained and illustrated below with specific embodiments.

[0055] Example 1:

[0056] A rubber structure dispersant (the synthesis route diagram is as Figure 1 shown), and its preparation method includes the following steps:

[0057] 1) Disperse 1 part by mass of 1-hydroxyethylaziridine and 2.4 parts by mass of trimethylhexane diisocyanate in 10 parts by mass of toluene, react at 50 °C for 5 h, remove toluene, and obtain trimethylhexane diisocyanate partially blocked by aziridine;

[0058] 2) Disperse 1 part by mass of epoxy-terminated hydroxyl polybutadiene (the content of epoxy groups is 1.0 mmol / g and the content of hydroxyl groups is 0.5 mmol / g), 0.4 part by mass of O-(2-mercaptoethyl)-O'-methyl-poly(ethylene glycol) (number average molecular weight is 357), and 0.1 part by mass of tetrabutylammonium fluoride in 10 parts by mass of toluene, react at 60 °C (epoxy-mercapto point chemical reaction) for 10 h, remove toluene, and obtain polybutadiene grafted polyethylene glycol copolymer;

[0059] 3) Disperse 0.4 part by mass of trimethylhexane diisocyanate partially blocked by aziridine and 1 part by mass of polybutadiene grafted polyethylene glycol copolymer in 10 parts by mass of toluene, react at 80 °C for 5 h, remove toluene, and obtain the rubber structure dispersant.

[0060] A rubber adhesive, the preparation method of which includes the following steps:

[0061] Mix 1 part by mass of the above rubber structure dispersant, 0.7 part by mass of cobalt green (particle size is 1 μm to 100 μm), and 2 parts by mass of toluene and grind for 1 h, then add 2 parts by mass of carboxyl-terminated polybutadiene acrylonitrile rubber (carboxyl content is 0.4 mmol / g, mass percentage content of cyano group is 24%; Zibo Qilong Chemical Co., Ltd.), 2 parts by mass of carboxyl-terminated polybutadiene rubber (carboxyl content is 0.34 mmol / g; Zibo Qilong Chemical Co., Ltd.), 8 parts by mass of polyisobutylene rubber (weight average molecular weight is 1,000,000), 1 part by mass of terpene resin A115 and 10 parts by mass of toluene and mix evenly to obtain the rubber adhesive.

[0062] A termination tape, the preparation method of which includes the following steps:

[0063] 1) Evenly coat the non-silicone release agent RL-600 (Guangzhou Meigu Chemical Co., Ltd.) on one side of a polyethylene terephthalate film with a thickness of 20 μm, and then place it at 200 °C for heat preservation and curing for 2 min to form an isolation layer (thickness is 2 μm);

[0064] 2) Coat the above rubber adhesive on the other side of the polyethylene terephthalate film, and then place it at 200 °C for heat preservation and curing for 2 min to form an adhesive layer (thickness is 15 μm), wind up and slit to obtain the termination tape.

[0065] Example 2:

[0066] A rubber structure dispersant, and its preparation method comprises the following steps:

[0067] 1) Disperse 2 parts by mass of 1-hydroxyethylaziridine and 4.8 parts by mass of trimethylhexamethylene diisocyanate in 20 parts by mass of chloroform, react at 80 °C for 3 h, remove chloroform, and obtain trimethylhexamethylene diisocyanate partially blocked by aziridine;

[0068] 2) Disperse 2 parts by mass of epoxy-terminated hydroxy polybutadiene (the content of epoxy groups is 1.0 mmol / g, and the content of hydroxyl groups is 0.5 mmol / g), 0.7 parts by mass of O-(2-mercaptoethyl)-O'-methyl-poly(ethylene glycol) (number average molecular weight is 357), and 0.2 parts by mass of benzyltriethylammonium chloride in 50 parts by mass of chloroform, react at 40 °C for 5 h, remove chloroform, and obtain polybutadiene grafted polyethylene glycol copolymer;

[0069] 3) Disperse 0.8 parts by mass of trimethylhexamethylene diisocyanate partially blocked by aziridine and 2 parts by mass of polybutadiene grafted polyethylene glycol copolymer in 20 parts by mass of chloroform, react at 50 °C for 8 h, remove chloroform, and obtain the rubber structure dispersant.

[0070] A rubber adhesive, and its preparation method comprises the following steps:

[0071] Mix 2 parts by mass of the above rubber structure dispersant, 1.4 parts by mass of cobalt green (particle size is 1 μm to 100 μm), and 10 parts by mass of chloroform, grind for 3 h, then add 5 parts by mass of carboxyl-terminated polybutadiene acrylonitrile rubber (carboxyl content is 0.4 mmol / g, mass percentage content of cyano group is 24%; Zibo Qilong Chemical Co., Ltd.), 3 parts by mass of carboxyl-terminated polybutadiene rubber (carboxyl content is 0.34 mmol / g; Zibo Qilong Chemical Co., Ltd.), 16 parts by mass of polyisobutylene rubber (weight average molecular weight is 1,200,000), 5 parts by mass of C9 petroleum resin, and 20 parts by mass of chloroform, mix evenly, and obtain the rubber adhesive.

[0072] A termination tape, and its preparation method comprises the following steps:

[0073] 1) Evenly coat one side of a polyethylene terephthalate film with a thickness of 5 μm with a non-silicon release agent RL-600 (Guangzhou Meigu Chemical Co., Ltd.), and then place it at 100 °C for heat preservation and curing for 10 min to form an isolation layer (thickness is 0.2 μm);

[0074] 2) Coat the other side of the polyethylene terephthalate film with the above rubber adhesive, and then place it at 100 °C for heat preservation and curing for 10 min to form an adhesive layer (thickness is 3 μm), wind up and slit, and obtain the termination tape.

[0075] Example 3:

[0076] A rubber structure dispersant, and its preparation method comprises the following steps:

[0077] 1) Disperse 3 parts by mass of 1-hydroxyethylaziridine and 7.2 parts by mass of trimethylhexamethylene diisocyanate in 40 parts by mass of dichloromethane, react at 50 °C for 4 h, remove dichloromethane, and obtain trimethylhexamethylene diisocyanate partially blocked by aziridine;

[0078] 2) Disperse 3 parts by mass of epoxy-terminated hydroxy polybutadiene (with an epoxy group content of 1.0 mmol / g and a hydroxyl group content of 0.5 mmol / g), 1 part by mass of O-(2-mercaptoethyl)-O'-methyl-poly(ethylene glycol) (number-average molecular weight of 357), and 0.2 part by mass of triethylamine in 30 parts by mass of toluene, react at 60 °C for 6 h, remove toluene, and obtain a polybutadiene grafted poly(ethylene glycol) copolymer;

[0079] 3) Disperse 1.2 parts by mass of trimethylhexamethylene diisocyanate partially blocked by aziridine and 3 parts by mass of the polybutadiene grafted poly(ethylene glycol) copolymer in 30 parts by mass of toluene, react at 70 °C for 4 h, remove toluene, and obtain the rubber structure dispersant.

[0080] A rubber adhesive, and its preparation method comprises the following steps:

[0081] Mix 3 parts by mass of the above rubber structure dispersant, 2.1 parts by mass of cobalt green (particle size of 1 μm to 100 μm), and 8 parts by mass of toluene, grind for 4 h, then add 3 parts by mass of carboxyl-terminated polybutadiene acrylonitrile rubber (carboxyl content of 0.4 mmol / g, mass percentage of cyanide group of 24%; Zibo Qilong Chemical Co., Ltd.), 6 parts by mass of carboxyl-terminated polybutadiene rubber (carboxyl content of 0.34 mmol / g; Zibo Qilong Chemical Co., Ltd.), 30 parts by mass of polyisobutene rubber (weight-average molecular weight of 500,000), 3 parts by mass of C9 petroleum resin, and 30 parts by mass of chloroform, and mix evenly to obtain the rubber adhesive.

[0082] A termination tape, and its preparation method comprises the following steps:

[0083] 1) Evenly coat one side of a polyethylene terephthalate film with a thickness of 10 μm with a non-silicon release agent RL-600 (Guangzhou Meigu Chemical Co., Ltd.), and then place it at 150 °C for heat preservation and curing for 5 min to form an isolation layer (thickness of 1 μm);

[0084] 2) Coat the other side of the polyethylene terephthalate film with the above rubber adhesive, and then place it at 150 °C for heat preservation and curing for 5 min to form an adhesive layer (thickness of 5 μm), wind up and slit to obtain the termination tape.

[0085] Example 4:

[0086] A rubber structure dispersant, and its preparation method includes the following steps:

[0087] 1) Disperse 3 parts by mass of 1-hydroxyethylaziridine and 7.2 parts by mass of trimethylhexane diisocyanate in 30 parts by mass of toluene, react at 70 °C for 3 h, remove toluene, and obtain trimethylhexane diisocyanate partially blocked by aziridine;

[0088] 2) Disperse 4 parts by mass of epoxy-terminated hydroxy polybutadiene (the content of epoxy groups is 1.0 mmol / g, and the content of hydroxyl groups is 0.5 mmol / g), 1.4 parts by mass of O-(2-mercaptoethyl)-O'-methyl-poly(ethylene glycol) (number average molecular weight is 357), and 0.4 parts by mass of triethylamine in 40 parts by mass of chloroform, react at 50 °C for 5 h, remove chloroform, and obtain polybutadiene grafted polyglycol copolymer;

[0089] 3) Disperse 1.6 parts by mass of trimethylhexane diisocyanate partially blocked by aziridine and 4 parts by mass of polybutadiene grafted polyglycol copolymer in 30 parts by mass of toluene, react at 60 °C for 5 h, remove toluene, and obtain the rubber structure dispersant.

[0090] A rubber adhesive, and its preparation method includes the following steps:

[0091] Mix 4 parts by mass of the above rubber structure dispersant, 2.8 parts by mass of cobalt green (particle size is 1 μm - 100 μm), and 10 parts by mass of chloroform, grind for 5 h, then add 5 parts by mass of carboxyl-terminated polybutadiene acrylonitrile rubber (carboxyl content is 0.4 mmol / g, mass percentage content of cyano group is 24%; Zibo Qilong Chemical Co., Ltd.), 5 parts by mass of carboxyl-terminated polybutadiene rubber (carboxyl content is 0.34 mmol / g; Zibo Qilong Chemical Co., Ltd.), 35 parts by mass of polyisobutylene rubber (weight average molecular weight is 700000), 2 parts by mass of C9 petroleum resin, and 30 parts by mass of toluene, and mix evenly to obtain the rubber adhesive.

[0092] A termination tape, and its preparation method includes the following steps:

[0093] 1) Evenly coat one side of a polyethylene terephthalate film with a thickness of 15 μm with a non-silicon release agent RL-600 (Guangzhou Meigu Chemical Co., Ltd.), and then place it at 170 °C for heat preservation and curing for 4 min to form an isolation layer (thickness is 1.5 μm);

[0094] 2) Coating the above rubber adhesive on the other side of the polyethylene terephthalate film, then placing it at 170 °C for heat preservation and curing for 4 min to form an adhesive layer (with a thickness of 10 μm), winding and slitting to obtain the termination tape.

[0095] Comparative example:

[0096] A rubber adhesive, the preparation method of which comprises the following steps:

[0097] Mixing 2.8 parts by mass of cobalt green (particle size of 1 μm to 100 μm) and 10 parts by mass of chloroform and grinding for 5 h, then adding 5 parts by mass of carboxyl-terminated polybutadiene acrylonitrile rubber (carboxyl content of 0.4 mmol / g, mass percentage content of cyano group of 24%; Zibo Qilong Chemical Co., Ltd.), 5 parts by mass of carboxyl-terminated polybutadiene rubber (carboxyl content of 0.34 mmol / g; Zibo Qilong Chemical Co., Ltd.), 35 parts by mass of polyisobutylene rubber (weight average molecular weight of 700,000), 2 parts by mass of C9 petroleum resin and 30 parts by mass of toluene and mixing evenly to obtain the rubber adhesive.

[0098] A termination tape, the preparation method of which comprises the following steps:

[0099] 1) Uniformly coating the non-silicon release agent RL-600 (Guangzhou Meigu Chemical Co., Ltd.) on one side of the polyethylene terephthalate film with a thickness of 15 μm, then placing it at 170 °C for heat preservation and curing for 4 min to form an isolation layer (with a thickness of 1.5 μm);

[0100] 2) Coating the above rubber adhesive on the other side of the polyethylene terephthalate film, then placing it at 170 °C for heat preservation and curing for 4 min to form an adhesive layer (with a thickness of 10 μm), winding and slitting to obtain the termination tape.

[0101] Performance test:

[0102] Testing the appearance and bonding performance of the termination tapes of Examples 1 to 4 and the comparative example, and the obtained optical microscope photos are as Figure 2 (The magnification is 100 times, and a to e are the termination tapes of Examples 1 to 4 and the comparative example in sequence) shown, and the test results of appearance and bonding performance are shown in the following table:

[0103] Table 1 Test results of appearance and bonding performance of the termination tapes of Examples 1 to 4 and the comparative example

[0104]

[0105] Note: The high-voltage type lithium-ion electrolyte used in the test process is the high-voltage type electrolyte KLE-C106V (Xianghe Kunlun New Energy Materials Co., Ltd.).

[0106] 180° peel strength: The test was carried out with reference to "GB / T 2792-2014 Test method for peel strength of adhesive tapes".

[0107] From Figure 2 and Table 1, it can be seen that the termination tapes of Examples 1 to 4 have uniform color and excellent electrolyte resistance (the highest 180° peel strength retention rate can reach 94.4%), while the termination tapes of the comparative example have non-uniform color and much worse electrolyte resistance (the 180° peel strength retention rate is only 39.1%). The reason is that the termination tape of the comparative example does not use the rubber structure dispersant of the present invention to disperse inorganic pigments, resulting in poor dispersion of inorganic pigments, non-uniform color, and a significant decrease in the electrolyte resistance of the termination tape.

[0108] The above embodiments are the preferred embodiments of the present invention, but the embodiments of the present invention are not limited by the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention shall be equivalent replacement methods and are all included in the protection scope of the present invention.

Claims

1. A rubber structure dispersant, characterized in that, It is prepared by reacting a polybutadiene-grafted polyethylene glycol copolymer with trimethylhexamethylene diisocyanate partially blocked by aziridine in a mass ratio of 1:0.3 to 0.5; the polybutadiene-grafted polyethylene glycol copolymer is prepared by reacting epoxidized hydroxyl-terminated polybutadiene with O-(2-mercaptoethyl)-O'-methyl-poly(ethylene glycol) in a mass ratio of 1:0.3 to 0.4; the trimethylhexamethylene diisocyanate partially blocked by aziridine is prepared by reacting 1-hydroxyethyl aziridine with trimethylhexamethylene diisocyanate in a mass ratio of 1:2.2 to 2.

6.

2. The rubber structure dispersant according to claim 1, wherein: The content of epoxy groups in the epoxidized hydroxyl-terminated polybutadiene is 1.0 mmol / g to 2.4 mmol / g, and the content of hydroxyl groups is 0.3 mmol / g to 1.0 mmol / g.

3. The rubber structure dispersant according to claim 1 or 2, characterized in that: The number average molecular weight of the O-(2-mercaptoethyl)-O'-methyl-poly(ethylene glycol) is 200 to 2000.

4. A method for preparing a rubber structure dispersant according to any one of claims 1 to 3, characterized in that, It includes the following steps: 1) Disperse 1-hydroxyethyl aziridine and trimethylhexamethylene diisocyanate in an organic solvent for reaction to obtain trimethylhexamethylene diisocyanate partially blocked by aziridine; 2) Disperse epoxidized hydroxyl-terminated polybutadiene, O-(2-mercaptoethyl)-O'-methyl-poly(ethylene glycol) and a catalyst in an organic solvent for reaction to obtain a polybutadiene-grafted polyethylene glycol copolymer; 3) Disperse the trimethylhexamethylene diisocyanate partially blocked by aziridine and the polybutadiene-grafted polyethylene glycol copolymer in an organic solvent for reaction to obtain the rubber structure dispersant.

5. The preparation method according to claim 4, characterized in that: The organic solvent in steps 1), 2) and 3) is at least one of toluene, chloroform and dichloromethane; the catalyst in step 2) is at least one of tetrabutylammonium fluoride, benzyltriethylammonium chloride and triethylamine.

6. The preparation method according to claim 4 or 5, characterized in that: The reaction in step 1) is carried out at 50 °C to 80 °C, and the reaction time is 3 h to 5 h; the reaction in step 2) is carried out at 40 °C to 80 °C, and the reaction time is 3 h to 10 h; The reaction in step 3) is carried out at 50 °C to 90 °C, and the reaction time is 3 h to 10 h.

7. A rubber adhesive, characterized in that, It includes the following components in parts by mass: Carboxyl-terminated polybutadiene acrylonitrile rubber: 100 parts; Carboxyl-terminated polybutadiene rubber: 60 parts to 200 parts; Polyisobutylene rubber: 300 parts to 1000 parts; Tackifying resin: 40 parts to 100 parts; The rubber structure dispersant according to any one of claims 1 to 3: 40 parts to 100 parts; Inorganic pigment: 20 parts to 100 parts; Organic solvent: 100 parts to 1300 parts.

8. The rubber adhesive according to claim 7, wherein: The content of carboxyl groups in the carboxyl-terminated polybutadiene acrylonitrile rubber is 0.3 mmol / g to 0.5 mmol / g, and the mass percentage content of cyano groups is 22% to 26%; the content of carboxyl groups in the carboxyl-terminated polybutadiene rubber is 0.3 mmol / g to 0.5 mmol / g; the weight average molecular weight of the polyisobutylene rubber is 500000 to 1200000.

9. The rubber adhesive according to claim 7 or 8, characterized in that: The tackifying resin is at least one of terpene resin and C9 petroleum resin.

10. A termination tape, characterized in that, It includes a release layer, a base film and an adhesive layer stacked in sequence; the adhesive layer contains the rubber adhesive according to any one of claims 7 to 9.

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