Indene-modified sbs adhesive and method for preparing the same

Abstract

The present application belongs to the technical field of adhesive, and particularly relates to an indene modified SBS adhesive and a preparation method thereof. The adhesive components include SBS, indene, initiator, coupling agent, anti-aging agent, catalyst and solvent. The preparation method of the adhesive comprises the following steps: pretreatment of raw materials: removing the polymerization inhibitor from SBS and indene through vacuum distillation, dehydrating the initiator, coupling agent, anti-aging agent and catalyst with a drying agent to obtain pretreated raw materials; preparation of polymerization liquid: placing SBS and solvent into a reaction kettle, cooling, continuously stirring until completely dissolved after nitrogen replacement, continuously reacting by adding indene, initiator and anti-aging agent into the reaction kettle, controlling the temperature to room temperature, and adding the coupling agent and catalyst dropwise to obtain the polymerization liquid; vacuum distillation of the polymerization liquid to obtain the indene modified SBS adhesive. The adhesive prepared by the present application is heat resistant, has excellent aging resistance, is storage stable, has better compatibility with polar materials, has good adhesion, and expands the application range.

Description

Technical Field

[0001] This invention belongs to the field of adhesive technology, specifically relating to an indene-modified SBS adhesive and its preparation method. Background Technology

[0002] Polystyrene-butadiene-styrene block copolymer (SBS) is currently the world's most produced thermoplastic elastomer. Due to its structure, which has a flexible rubber middle segment (PB segment) and a hard plastic end segment (PS segment), SBS has both the solubility and thermoplasticity of polystyrene and the flexibility and resilience of cis-butadiene rubber. SBS has excellent tensile properties, good low-temperature resistance, air permeability, solubility, and excellent anti-slip properties, which makes SBS widely used in rubber products, adhesives, asphalt, and resin modification.

[0003] Patent application CN105153986B discloses a polyurethane-modified SBS adhesive and its preparation method. The method involves polymerizing an NCO-terminated polyurethane prepolymer with styrene-butadiene rubber in a reactor to obtain a polyurethane-modified SBS adhesive, which improves the fracture growth rate and tensile shear strength of the SBS adhesive.

[0004] However, the unsaturated bonds in the SBS molecular chain make it sensitive to light, heat, and oxygen, resulting in poor aging resistance. In addition, SBS is a non-polar material, which has low compatibility and adhesion to polar materials such as polyvinyl chloride, cement, and metals. Therefore, considering the above patent applications and the characteristics of SBS, the existing SBS adhesives have relatively poor heat resistance and aging resistance, which can easily lead to storage instability. Moreover, their compatibility with polar materials is relatively poor, and their adhesion is not good, which limits their application areas. Summary of the Invention

[0005] The purpose of this invention is to provide an indene-modified SBS adhesive and its preparation method, so that the prepared adhesive has excellent heat resistance, aging resistance, storage stability, good compatibility with polar materials, and good adhesion, thereby expanding its application range.

[0006] An indene-modified SBS adhesive comprises the following components by mass fraction:

[0007] SBS 30-40wt%, Indene 10-20wt%, Initiator 1-1.5wt%, Coupling agent 7-10wt%, Anti-aging agent 1-1.5wt%, Catalyst 1-3wt%, Solvent 40-45wt%.

[0008] Using the above technical solution, indene, an important aromatic hydrocarbon, is mainly found in the C9 fraction of ethylene cracking byproducts and coal tar. Indene exhibits excellent photoelectric and thermal properties, attracting widespread attention from scholars both domestically and internationally. Brown conducted preliminary research on indene polymerization in the 1920s, and Carmody synthesized indene-coumarone resin from coal tar byproducts in the 1940s. Blending indene with coumarone resin can impart good adhesive properties to rubber. Therefore, this application of indene-modified SBS can overcome the shortcomings of SBS itself and expand its application areas.

[0009] Preferably, the initiator includes at least one of the following: azo initiator AIBN, organic peroxide initiator BPO, and LPO.

[0010] Preferably, the anti-aging agent includes at least one of amine anti-aging agents and phenolic anti-aging agents.

[0011] Preferably, the solvent includes at least one selected from toluene, cyclohexane, methyl ethyl ketone, and dichloroethane.

[0012] Preferably, the catalyst is a moisture-curing catalyst, and the coupling agent includes at least one of silane coupling agents and titanate coupling agents.

[0013] Another object of the present invention is to provide a method for preparing the indene-modified SBS adhesive, comprising the following steps:

[0014] (1) Pretreatment of raw materials: SBS and indene are depolymerized by vacuum distillation to remove polymerization inhibitors, initiators, coupling agents, anti-aging agents and catalysts. The raw materials are placed in a container and dehydrated with a desiccant until the water content is below 10 ppm before use to obtain pretreated raw materials.

[0015] (2) Preparation of polymer solution by SBS polymerization: Weigh SBS and solvent into a reaction vessel, cool to 0-10℃, purge with nitrogen for 10-30 min and continue stirring until completely dissolved, add indene, initiator and anti-aging agent into the reaction vessel and continue reaction, control the temperature to room temperature, add coupling agent and catalyst dropwise and react for 3-5 h to obtain polymer solution, wherein SBS, indene, initiator, anti-aging agent, coupling agent and catalyst are all pretreated raw materials obtained in step (1);

[0016] (3) The polymer solution prepared in step (2) is subjected to vacuum distillation to remove solvent and impurities, and a copolymer is obtained, which is the indene-modified SBS adhesive.

[0017] Preferably, in step (1), the vacuum degree of the reduced pressure distillation is -0.085 to -0.095 MPa, the distillation temperature is 120 to 160°C, and the distillation time is 3 to 5 hours.

[0018] Preferably, in step (1), the desiccant includes at least one of calcium chloride, soda lime, and quicklime, and the amount of the desiccant used is 30-50g.

[0019] Preferably, in step (2), the reaction time is 3 to 5 hours.

[0020] Preferably, in step (3), the vacuum degree of vacuum distillation is -0.085 to -0.095 MPa, the distillation temperature is 120 to 160°C, and the distillation time is 3 to 5 hours.

[0021] The beneficial effects of this invention are:

[0022] First, this application utilizes the structural characteristics of indene aromatic hydrocarbons to endow SBS with excellent heat resistance and aging resistance;

[0023] Second, the indene-SBS copolymer prepared in this application has good compatibility with polar resins. Good compatibility results in good adhesion. Indene molecules contain highly chemically active olefin bonds, which are prone to polymerization or addition reactions.

[0024] In summary, the adhesive prepared in this application has excellent heat resistance, aging resistance, storage stability, good compatibility with polar materials, and good adhesion, thus expanding its application range. Attached Figure Description

[0025] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0026] In the attached diagram:

[0027] Figure 1 This is a schematic diagram of the preparation process of the present invention. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Unless otherwise specified, the reagents used in the examples are readily available from commercial companies.

[0030] Example 1

[0031] An indene-modified SBS adhesive, the formulation of which is shown in Table 1 below:

[0032] Table 1

[0033] formula Components Step (2) Specific parameters SBS / 40g Indene / 10g Initiator AIBN 1g Coupling agent Silane coupling agents 7g Anti-aging agents Amine anti-aging agents 1g catalyst Dibutyltin dilaurate 1g solvent Toluene 40g

[0034] Reference Figure 1 The preparation of indene-modified SBS adhesive includes the following steps:

[0035] (1) Raw material pretreatment: Take excess SBS and indene and add them to a vacuum distillation apparatus to remove the polymerization inhibitor. The vacuum distillation vacuum degree is -0.085MPa, the distillation temperature is 120℃, and the distillation time is 3h. Then, place excess initiator, coupling agent, anti-aging agent, and catalyst in a 1L desiccator and add 30g of calcium chloride to dehydrate and dry until the water content is reduced to below 10ppm to obtain the pretreated raw material.

[0036] (2) Preparation of polymer solution by modified SBS polymerization: including catalytic polymerization, specifically: referring to Table 1 above, weigh SBS and toluene and inject them into the reactor. Cool the reactants to 0°C by cooling circulation pump, purge with nitrogen for 10 min, turn on the mechanical stirrer and stir until SBS is completely dissolved in toluene. Then add indene, AIBN and amine anti-aging agent to the reactor and stir continuously for 3 h. Control the temperature to room temperature, add coupling agent and catalyst dropwise to the reactor, and continue the reaction for 3 h to obtain polymer solution. SBS, indene, initiator, anti-aging agent, coupling agent and catalyst are all pretreated raw materials obtained in step (1).

[0037] (3) Preparation of indene-modified SBS adhesive: including catalyst removal and vacuum distillation, specifically: the polymer solution prepared in step (2) is taken out from the reactor and transferred to a vacuum distillation apparatus for vacuum distillation to remove solvent and impurities, and a copolymer is obtained. The copolymer is indene-modified SBS adhesive. The vacuum degree of vacuum distillation is -0.085MPa, the distillation temperature is 120℃, and the distillation time is 3h.

[0038] Example 2

[0039] An indene-modified SBS adhesive, the formulation of which is shown in Table 2 below:

[0040] Table 2

[0041] formula Components Step (2) Specific parameters SBS / 35g Indene / 12g Initiator BPO 1.5g Coupling agent Titanate coupling agents 7g Anti-aging agents Phenolic anti-aging agents 1.5g catalyst Dibutyltin dilaurate 1g solvent Cyclohexane 42g

[0042] Reference Figure 1 The preparation of indene-modified SBS adhesive includes the following steps:

[0043] (1) Raw material pretreatment: Take excess SBS and indene and add them to a vacuum distillation apparatus to remove the polymerization inhibitor. The vacuum distillation vacuum degree is -0.090MPa, the distillation temperature is 130℃, and the distillation time is 4h. Then, place excess initiator, coupling agent, anti-aging agent, and catalyst in a 1L desiccator and add 40g of quicklime to dehydrate and dry until the water content is reduced to below 10ppm to obtain the pretreated raw material.

[0044] (2) Preparation of polymer solution by modified SBS polymerization: including catalytic polymerization, specifically: referring to Table 2 above, weigh SBS and cyclohexane and inject them into the reactor. Cool the reactants to 4°C by cooling circulation pump, purge with nitrogen for 10 min, turn on the mechanical stirrer and stir until SBS is completely dissolved in cyclohexane. Then add indene, BPO and phenolic anti-aging agent to the reactor and stir continuously for 4 h. Control the temperature to room temperature, add coupling agent and catalyst dropwise to the reactor, and continue the reaction for 4 h to obtain polymer solution. SBS, indene, initiator, anti-aging agent, coupling agent and catalyst are all pretreated raw materials obtained in step (1).

[0045] (3) Preparation of indene-modified SBS adhesive: including catalyst removal and vacuum distillation, specifically: the polymer solution prepared in step (2) is taken out from the reactor and transferred to a vacuum distillation apparatus for vacuum distillation to remove solvent and impurities, and a copolymer is obtained. The copolymer is indene-modified SBS adhesive. The vacuum degree of vacuum distillation is -0.090 MPa, the distillation temperature is 130℃, and the distillation time is 4h.

[0046] Example 3

[0047] An indene-modified SBS adhesive, the formulation of which is shown in Table 3 below:

[0048] Table 3

[0049] formula Components Step (2) Specific parameters SBS / 30g Indene / 13g Initiator LPO 1.5g Coupling agent Titanate coupling agents 10g Anti-aging agents Phenolic anti-aging agents 1.5g catalyst Dibutyltin dilaurate 1g solvent Methyl ethyl ketone 43g

[0050] Reference Figure 1 The preparation of indene-modified SBS adhesive includes the following steps:

[0051] (1) Raw material pretreatment: Take excess SBS and indene and add them to a vacuum distillation apparatus to remove the polymerization inhibitor. The vacuum distillation vacuum degree is -0.095MPa, the distillation temperature is 150℃, and the distillation time is 5h. Then, place excess initiator, coupling agent, anti-aging agent, and catalyst in a 1L desiccator and add 50g of quicklime to dehydrate and dry until the water content is reduced to below 10ppm to obtain the pretreated raw material.

[0052] (2) Preparation of polymer solution by modified SBS polymerization: including catalytic polymerization, specifically: referring to Table 3 above, weigh SBS and methyl ethyl ketone and inject into the reactor. Cool the reactants to 4°C by cooling circulation pump, purge with nitrogen for 10 min, turn on mechanical stirring device and stir until SBS is completely dissolved in methyl ethyl ketone. Then add indene, LPO and phenolic anti-aging agent to the reactor and continue stirring for 4 h. Control the temperature to room temperature, add coupling agent and catalyst dropwise to the reactor, and continue the reaction for 4 h to obtain polymer solution. SBS, indene, initiator, anti-aging agent, coupling agent and catalyst are all pretreated raw materials obtained in step (1).

[0053] (3) Preparation of indene-modified SBS adhesive: including catalyst removal and vacuum distillation, specifically: the polymer solution prepared in step (2) is taken out from the reactor and transferred to a vacuum distillation apparatus for vacuum distillation to remove solvent and impurities, and a copolymer is obtained. The copolymer is indene-modified SBS adhesive. The vacuum degree of vacuum distillation is -0.095MPa, the distillation temperature is 150℃, and the distillation time is 5h.

[0054] Example 4

[0055] An indene-modified SBS adhesive, the formulation of which is shown in Table 4 below:

[0056] Table 4

[0057] formula Components Step (2) Specific parameters SBS / 30g Indene / 13g Initiator LPO 1g Coupling agent Titanate coupling agents 7g Anti-aging agents Phenolic anti-aging agents 1g catalyst Dibutyltin dilaurate 3g solvent Methyl ethyl ketone 45g

[0058] Reference Figure 1 The preparation of indene-modified SBS adhesive includes the following steps:

[0059] (1) Raw material pretreatment: Take excess SBS and indene and add them to a vacuum distillation apparatus to remove the polymerization inhibitor. The vacuum distillation vacuum degree is -0.095MPa, the distillation temperature is 160℃, and the distillation time is 5h. Then, place excess initiator, coupling agent, anti-aging agent, and catalyst in a 1L desiccator and add 45g of calcium chloride to dehydrate and dry until the water content is reduced to below 10ppm to obtain the pretreated raw material.

[0060] (2) Preparation of polymer solution by modified SBS polymerization: including catalytic polymerization, specifically: referring to Table 4 above, weigh SBS and methyl ethyl ketone and inject into the reactor. Cool the reactants to 4°C by cooling circulation pump, purge with nitrogen for 10 min, turn on mechanical stirring device and stir until SBS is completely dissolved in methyl ethyl ketone. Then add indene, LPO and phenolic anti-aging agent to the reactor and stir continuously for 4 h. Control the temperature to room temperature, add coupling agent and catalyst dropwise to the reactor, and continue to react for 4 h to obtain polymer solution. SBS, indene, initiator, anti-aging agent, coupling agent and catalyst are all pretreated raw materials obtained in step (1).

[0061] (3) Preparation of indene-modified SBS adhesive: including catalyst removal and vacuum distillation, specifically: the polymer solution prepared in step (2) is taken out from the reactor and transferred to a vacuum distillation apparatus for vacuum distillation to remove solvent and impurities, and a copolymer is obtained. The copolymer is indene-modified SBS adhesive. The vacuum degree of vacuum distillation is -0.095MPa, the distillation temperature is 150℃, and the distillation time is 5h.

[0062] Example 5

[0063] An indene-modified SBS adhesive, the formulation of which is shown in Table 5 below:

[0064] Table 5

[0065] formula Components Step (2) Specific parameters SBS / 30g Indene / 20g Initiator LPO 1g Coupling agent Titanate coupling agents 7g Anti-aging agents Phenolic anti-aging agents 1g catalyst Dibutyltin dilaurate 1g solvent dichloroethane 40g

[0066] Reference Figure 1 The preparation of indene-modified SBS adhesive includes the following steps:

[0067] (1) Raw material pretreatment: Take excess SBS and indene and add them to a vacuum distillation apparatus to remove the polymerization inhibitor. The vacuum distillation vacuum degree is -0.095MPa, the distillation temperature is 160℃, and the distillation time is 5h. Then, place excess initiator, coupling agent, anti-aging agent, and catalyst in a 1L desiccator and add 40g of quicklime to dehydrate and dry until the water content is reduced to below 10ppm to obtain the pretreated raw material.

[0068] (2) Preparation of polymer solution by modified SBS polymerization: including catalytic polymerization, specifically: referring to Table 5 above, weigh SBS and dichloroethane and inject them into the reactor. Cool the reactants to 4°C by cooling circulation pump, purge with nitrogen for 10 min, turn on the mechanical stirring device and stir until SBS is completely dissolved in dichloroethane. Then add indene, LPO and phenolic anti-aging agent to the reactor and stir continuously for 4 h. Control the temperature to room temperature, add coupling agent and catalyst dropwise to the reactor, and continue to react for 4 h to obtain polymer solution. SBS, indene, initiator, anti-aging agent, coupling agent and catalyst are all pretreated raw materials obtained in step (1).

[0069] (3) Preparation of indene-modified SBS adhesive: including catalyst removal and vacuum distillation, specifically: the polymer solution prepared in step (2) is taken out from the reactor and transferred to a vacuum distillation apparatus for vacuum distillation to remove solvent and impurities, and a copolymer is obtained. The copolymer is indene-modified SBS adhesive. The vacuum degree of vacuum distillation is -0.095MPa, the distillation temperature is 150℃, and the distillation time is 5h.

[0070] Comparative Example 1

[0071] An SBS adhesive, the formulation of which is shown in Table 6 below:

[0072] Table 6

[0073] formula Components Step (2) Specific parameters SBS / 50g Coupling agent Silane coupling agents 9g Anti-aging agents Amine anti-aging agents 1g solvent Toluene 40g

[0074] The preparation of SBS adhesive includes the following steps:

[0075] (1) Raw material pretreatment: Take excess SBS and add it to a vacuum distillation apparatus to remove the polymerization inhibitor. The vacuum distillation vacuum degree is -0.085MPa, the distillation temperature is 120℃, and the distillation time is 3h. Then, place excess coupling agent and anti-aging agent in a 1L desiccator, add 30g of calcium chloride to dehydrate and dry until the water content is reduced to below 10ppm to obtain the pretreated raw material.

[0076] (2) Preparation of SBS polymer solution: According to Table 6 above, weigh SBS and toluene and inject them into the reactor. Cool the reactants to 0°C by cooling circulation pump, purge with nitrogen for 10 min, turn on mechanical stirring device and stir until SBS is completely dissolved in toluene. Then add amine anti-aging agent to the reactor and stir continuously for 3 h. Control the temperature to room temperature, add coupling agent dropwise to the reactor, and continue to react for 3 h to obtain polymer solution. SBS, coupling agent and anti-aging agent are all pretreated raw materials obtained in step (1).

[0077] (3) Preparation of SBS adhesive: The polymer solution prepared in step (2) is taken out from the reactor and transferred to a vacuum distillation apparatus for vacuum distillation to remove solvent and impurities, and a copolymer is obtained. The copolymer is SBS adhesive. The vacuum degree of vacuum distillation is -0.085MPa, the distillation temperature is 120℃, and the distillation time is 3h.

[0078] Comparative Example 2

[0079] An indene-modified SBS adhesive, the formulation of which is shown in Table 7 below:

[0080] Table 7

[0081] formula Components Step (2) Specific parameters SBS / 35g Indene / 13g Initiator BPO 1g Coupling agent Titanate coupling agents 7g Anti-aging agents Phenolic anti-aging agents 1g catalyst Dibutyltin dilaurate 1g solvent Cyclohexane 42g

[0082] The preparation of indene-modified SBS adhesive includes the following steps:

[0083] (1) Raw material pretreatment: Place the excess initiator, coupling agent, anti-aging agent and catalyst in a 1L desiccator, add 40g of quicklime to dehydrate and dry until the water content is reduced to below 10ppm, and obtain the pretreated raw material.

[0084] (2) Preparation of polymer solution by SBS polymerization: Referring to Table 7 above, weigh SBS and cyclohexane and inject them into the reactor. Cool the reactants to 4°C by cooling circulation pump, purge with nitrogen for 10 min, turn on mechanical stirring device and stir until SBS is completely dissolved in cyclohexane. Then add indene, BPO and phenolic anti-aging agent to the reactor and stir continuously for 4 h. Control the temperature to room temperature, add coupling agent and catalyst dropwise to the reactor, and continue to react for 4 h to obtain polymer solution. Initiator, coupling agent, anti-aging agent and catalyst are all pretreated raw materials obtained in step (1).

[0085] (3) Preparation of indene-modified SBS adhesive: The polymer solution prepared in step (2) is taken out from the reactor and transferred to a vacuum distillation apparatus for vacuum distillation to remove solvent and impurities, and a copolymer is obtained. The copolymer is an indene-modified SBS adhesive. The vacuum degree of vacuum distillation is -0.090 MPa, the distillation temperature is 130℃, and the distillation time is 4h.

[0086] Comparative Example 3

[0087] An indene-modified SBS adhesive, the formulation of which is shown in Table 8 below:

[0088] Table 8

[0089]

[0090]

[0091] The preparation of indene-modified SBS adhesive includes the following steps:

[0092] (1) Raw material pretreatment: Take excess SBS and indene and add them to a vacuum distillation apparatus to remove the polymerization inhibitor. The vacuum distillation vacuum degree is -0.095MPa, the distillation temperature is 150℃, and the distillation time is 5h. Then, place excess initiator, coupling agent, and catalyst in a 1L desiccator and add 50g of quicklime to dehydrate and dry until the water content is reduced to below 10ppm to obtain the pretreated raw material.

[0093] (2) Preparation of polymer solution by modified SBS polymerization: including catalytic polymerization, specifically: referring to Table 8 above, weigh SBS and methyl ethyl ketone and inject into the reactor. Cool the reactants to 4°C by cooling circulation pump, purge with nitrogen for 10 min, turn on mechanical stirring device and stir until SBS is completely dissolved in methyl ethyl ketone. Then add indene and LPO into the reactor and stir continuously for 4 h. Control the temperature to room temperature, add coupling agent and catalyst dropwise into the reactor, and continue the reaction for 4 h to obtain polymer solution. SBS, indene, initiator, coupling agent and catalyst are all pretreated raw materials obtained in step (1).

[0094] (3) Preparation of indene-modified SBS adhesive: including catalyst removal and vacuum distillation, specifically: the polymer solution prepared in step (2) is taken out from the reactor and transferred to a vacuum distillation apparatus for vacuum distillation to remove solvent and impurities, and a copolymer is obtained. The copolymer is indene-modified SBS adhesive. The vacuum degree of vacuum distillation is -0.095MPa, the distillation temperature is 150℃, and the distillation time is 5h.

[0095] Samples of the indene-modified SBS adhesives of Examples 1-5 and the SBS adhesives of Comparative Examples 1-3 with the same parameters were tested. The specific test contents were as follows: (1) Softening point was tested using the ring and ball method according to standard GB / 2294-2019; (2) Aging resistance test conditions: the sample was placed in an aging chamber at 160℃ and aged for 30 days to test the retention rate of tensile shear strength; (3) Viscosity was tested according to GB / T 2794-2013; (4) Peel strength was tested according to GB / T 2791-1995; (5) Compatibility was tested by melt blending the sample with polyvinyl chloride and observing its surface morphology after hot pressing. The test results are shown in Table 9 below:

[0096] Table 9

[0097]

[0098] Results Analysis: Referring to Table 9, it can be seen from Comparative Example 1 that, compared with existing SBS adhesives, indene-modified SBS adhesives have better compatibility with polar PVC resin; the difference in tensile shear strength retention between Examples 1-5 and Comparative Examples 1-3 can reach 36%, the viscosity difference can reach 285 mPa·s, and the peel strength difference can reach 4.2 N·25 mm. -1 The softening point difference can reach 12℃; therefore, this indicates that the adhesive prepared in this application has excellent heat resistance, aging resistance, storage stability, good compatibility with polar materials, and good adhesion, thus expanding its application range.

[0099] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An indene-modified SBS adhesive, characterized in that, It consists of the following components by mass fraction: SBS 30-40wt%, Indene 10-20wt%, Initiator 1-1.5wt%, Coupling Agent 7-10wt%, Anti-aging Agent 1-1.5wt%, Catalyst 1-3wt%, Solvent 40-45wt%; The preparation method of the indene-modified SBS adhesive includes the following steps: (1) Pretreatment of raw materials: SBS and indene are depolymerized by vacuum distillation to remove the polymerization inhibitor, initiator, coupling agent, anti-aging agent and catalyst are placed in a container and dehydrated with desiccant to less than 10 ppm before use to obtain the pretreated raw materials; (2) Preparation of polymer solution by SBS polymerization: Weigh SBS and solvent into a reactor, cool to 0~10℃, purge with nitrogen for 10~30 min and stir continuously until completely dissolved, add indene, initiator and anti-aging agent into the reactor and continue to react, control the temperature to room temperature, add coupling agent and catalyst dropwise and react for 3~5 h to obtain polymer solution, wherein SBS, indene, initiator, anti-aging agent, coupling agent and catalyst are all pretreated raw materials obtained in step (1); (3) The polymer solution prepared in step (2) is subjected to vacuum distillation to remove solvent and impurities to obtain a copolymer, which is the indene-modified SBS adhesive.

2. The indene-modified SBS adhesive according to claim 1, characterized in that, The initiator includes at least one of the following: azo initiator AIBN, organic peroxide initiator BPO, and LPO.

3. The indene-modified SBS adhesive according to claim 2, characterized in that, The anti-aging agent includes at least one of amine anti-aging agents and phenolic anti-aging agents.

4. The indene-modified SBS adhesive according to claim 3, characterized in that, The solvent includes at least one of toluene, cyclohexane, methyl ethyl ketone, and dichloroethane.

5. The indene-modified SBS adhesive according to claim 4, characterized in that, The catalyst is a moisture-curing catalyst, and the coupling agent includes at least one of silane coupling agents and titanate coupling agents.

6. The indene-modified SBS adhesive according to claim 1, characterized in that, In step (1), the vacuum degree of the reduced pressure distillation is -0.085 to -0.095 MPa, the distillation temperature is 120 to 160°C, and the distillation time is 3 to 5 hours.

7. The indene-modified SBS adhesive according to claim 1, characterized in that, In step (1), the desiccant includes at least one of calcium chloride, soda lime, and quicklime, and the amount of the desiccant used is 30-50g.

8. The indene-modified SBS adhesive according to claim 1, characterized in that, In step (2), the reaction time is 3 to 5 hours.

9. The indene-modified SBS adhesive according to claim 1, characterized in that, In step (3), the vacuum degree of vacuum distillation is -0.085~-0.095MPa, the distillation temperature is 120~160℃, and the distillation time is 3~5h.

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