High-performance water-based automotive interior adhesive and preparation method thereof

Abstract

The invention discloses a high-performance water-based automotive interior adhesive and a preparation method thereof, and relates to the technical field of automotive interior adhesives. The high-performance water-based automotive interior adhesive is prepared from the following components in parts by mass: 30 to 50 parts of modified water-based polyurethane emulsion, 15 to 30 parts of acrylic emulsion, 5 to 15 parts of tackifying resin, 2 to 6 parts of coalescing agent, 0.5 to 3 parts of cross-linking agent, 0.1 to 0.5 part of flatting agent, 0.1 to 0.5 part of defoaming agent, 0.2 to 1 part of thickening agent, 0.05 to 0.3 part of preservative and 10 to 25 parts of deionized water. The water-based polyurethane emulsion is subjected to surface modification through the coupling agent with a specific structure, the bottleneck that the interface bonding force between a traditional water-based adhesive and PP and other low-surface-energy and non-polar base materials is insufficient is broken through, and high peel strength can be achieved without flame, corona or prime coat or other pretreatment procedures on the PP base materials; and the bonding process flow of the automotive interior trim parts is greatly simplified.

Description

Technical Field

[0001] This invention relates to the field of automotive interior adhesive technology, specifically to a high-performance water-based automotive interior adhesive and its preparation method. Background Technology

[0002] Automotive interior adhesives are key materials used for bonding interior parts in automobile production. As the automotive industry develops towards green, environmentally friendly, and high-performance directions, traditional solvent-based automotive interior adhesives have high emissions of volatile organic compounds (VOCs), which do not meet current environmental regulations and the industry's low-carbon development requirements. Water-based automotive interior adhesives have become the mainstream trend to replace solvent-based adhesives.

[0003] While current water-based automotive interior adhesives offer advantages such as low VOCs and no pollution, they suffer from significant shortcomings in adhesive performance, particularly weak adhesion to polypropylene (PP) automotive interior substrates. Polypropylene has low surface energy and strong non-polarity, resulting in insufficient interfacial bonding between existing water-based adhesives and PP substrates. In practical applications, pretreatment processes such as flame treatment and corona treatment are required for the PP substrate, increasing manufacturing steps and costs, and potentially affecting bonding consistency if not properly controlled. Furthermore, existing water-based automotive interior adhesives struggle to balance film-forming properties and temperature resistance. Some products sacrifice film flexibility to improve adhesion, or are prone to delamination and cracking under high and low temperature cycling conditions, failing to meet the long-term performance requirements of automotive interior parts. In addition, some water-based adhesives have complex preparation processes, poor emulsion compatibility, and are prone to delamination and demulsification, leading to insufficient product stability.

[0004] Therefore, developing a high-performance water-based automotive interior adhesive that does not require pretreatment of the polypropylene substrate and has high adhesion has become an urgent technical problem to be solved in the field of automotive interior adhesives. Summary of the Invention

[0005] The purpose of this invention is to address the problems of weak adhesion to polypropylene substrates, the need for pretreatment, and the difficulty in achieving both good and bad temperature resistance in existing water-based automotive interior adhesives. This invention provides a high-performance water-based automotive interior adhesive and its preparation method. This water-based automotive interior adhesive achieves high peel strength to polypropylene substrates without requiring pretreatment such as flame or corona treatment, while also possessing excellent overall performance.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A high-performance water-based automotive interior adhesive, comprising the following components by weight: 30-50 parts modified water-based polyurethane emulsion, 15-30 parts acrylic emulsion, 5-15 parts tackifying resin, 2-6 parts film-forming aid, 0.5-3 parts crosslinking agent, 0.1-0.5 parts leveling agent, 0.1-0.5 parts defoamer, 0.2-1 parts thickener, 0.05-0.3 parts preservative, and 10-25 parts deionized water;

[0008] The modified waterborne polyurethane emulsion is formed by modifying the surface of a waterborne polyurethane emulsion with a coupling agent;

[0009] The chemical structure of the coupling agent is as follows: .

[0010] Furthermore, the aqueous polyurethane emulsion is an aliphatic aqueous polyurethane emulsion with a solid content of 35-55%.

[0011] Furthermore, the preparation method of the modified waterborne polyurethane emulsion is as follows:

[0012] Step 1: Place the aqueous polyurethane emulsion in a constant temperature water bath, control the temperature at 35-45℃, stir at 150-250 r / min, stir for 15-25 min to remove air bubbles from the emulsion, and obtain a pretreated emulsion.

[0013] Step 2: Add the coupling agent to anhydrous ethanol, stir to dissolve, and prepare a coupling agent ethanol solution. During the stirring process, control the temperature at 25-30℃ and the stirring speed at 100-150 r / min until the solution is homogeneous and transparent.

[0014] Step 3: Slowly add the coupling agent ethanol solution to the pretreated emulsion at a rate of 1-3 mL / min. During the addition, maintain a stirring speed of 200-300 r / min and a reaction temperature of 40-50℃. After the addition is completed, continue stirring at a constant temperature for 2-4 hours to complete the modification of the surface of the waterborne polyurethane emulsion by the coupling agent.

[0015] Step 4: Cool the emulsion after the reaction in Step 3 to room temperature, adjust the pH value of the emulsion to 7.0-8.0, and then filter it with a 100-200 mesh filter to remove insoluble impurities, thereby obtaining the modified waterborne polyurethane emulsion.

[0016] Furthermore, the mass concentration of the coupling agent ethanol solution in step 2 is 8-12%.

[0017] Furthermore, the pH adjuster in step 4 is triethanolamine or diethanolamine.

[0018] Furthermore, the acrylic emulsion is a pure acrylic emulsion with a glass transition temperature of -20°C to 15°C and a solid content of 40%-50%.

[0019] Furthermore, the tackifying resin is one or more of rosin resin, terpene resin, and petroleum resin.

[0020] Furthermore, the film-forming aid is one or more of dipropylene glycol butyl ether, ethylene glycol butyl ether, and dodecyl alcohol ester.

[0021] Furthermore, the crosslinking agent is trimethylolpropane-tris(2-aziridinyl)propionate.

[0022] Furthermore, the leveling agent is one or more of BYK-300 and BYK-306.

[0023] Furthermore, the defoamer is one or more of BYK-024 and polyether ester GPE-10.

[0024] Furthermore, the thickener is hydroxyethyl cellulose, carbomer 940, or Rheolate 255.

[0025] Furthermore, the preservative is one or more of methylchloroisothiazolinone and benzisothiazolinone.

[0026] Furthermore, EPDM rubber can be added to the automotive interior adhesive.

[0027] A method for preparing a high-performance water-based automotive interior adhesive includes the following steps:

[0028] Step A: Add the deionized water to the reaction vessel, turn on the stirrer, control the stirring speed to be 180-280 r / min and the temperature to be 25-35℃, add the tackifying resin and film-forming aid in sequence, stir for 20-30 min until the mixture is uniform, and obtain the mixed base liquid;

[0029] Step B: Add the modified waterborne polyurethane emulsion and acrylic emulsion to the mixed base liquid, control the dropping rate to 2-4 mL / min, keep the stirring speed constant during the dropping process, and continue stirring for 30-45 min after the dropping is completed to obtain the composite emulsion;

[0030] Step C: Add the crosslinking agent, leveling agent, and defoamer to the composite emulsion in sequence, stir for 15-25 minutes, then add the thickener, adjust the stirring speed to 150-200 r / min, stir for 10-15 minutes until the system viscosity is uniform, then add the preservative, and continue stirring for 5-10 minutes to obtain a uniform mixture.

[0031] Step D: Filter the homogeneous mixture through a 150-250 mesh filter to remove insoluble impurities, and then let it stand in a constant temperature environment of 25-30℃ for 1-2 hours to remove residual air bubbles in the system, thus obtaining a high-performance water-based automotive interior adhesive.

[0032] Furthermore, in step C, the viscosity of the system is adjusted to 2500-5000 mPa·s.

[0033] Furthermore, in step D, during the settling process, ultrasonic degassing is performed for 5-10 minutes every 30 minutes, with an ultrasonic power of 100-150W.

[0034] A high-performance water-based automotive interior adhesive is used for bonding PP substrates of automotive interior materials to leather, fabric, PVC, and ABS substrates. After bonding, the adhesive is cured at 25°C and 50%RH for 24 hours without requiring flame, corona, or primer pretreatment of the PP substrate.

[0035] This invention addresses the technical problems of existing water-based automotive interior adhesives—namely, weak adhesion to PP substrates, the need for pretreatment, difficulty in balancing film-forming properties and temperature resistance, and poor product stability—through the precise synergistic combination of various formulation components. These problems are addressed from multiple dimensions, including interfacial bonding, film-forming performance, system stability, and process compatibility. The core component, a modified water-based polyurethane emulsion, is modified with a specific structural coupling agent. One end of its surface-grafted functional groups forms a strong bond with the polyurethane emulsion, while the other end achieves efficient interfacial bonding with the low surface energy, non-polar PP substrate. This overcomes the bottleneck of insufficient interfacial bonding between traditional water-based adhesives and PP substrates, achieving high adhesion without pretreatment. Simultaneously, this modified emulsion retains the excellent flexibility and temperature resistance of polyurethane and improves compatibility with other components. The core-shell acrylic emulsion is compounded with the modified water-based polyurethane emulsion. The excellent film-forming and weather-resistant properties of the acrylic emulsion complement the high elasticity and adhesion of the polyurethane emulsion, further enhancing the overall adhesive performance and high / low temperature resistance of the adhesive, avoiding the problems associated with film formation by a single emulsion. The system addresses issues such as easy delamination and cracking. Tackifying resins enhance the overall adhesion and initial tack of the system; film-forming aids optimize the film-forming effect of each emulsion, resulting in a denser and more uniform film; crosslinking agents enhance the cohesive strength, temperature resistance, and aging resistance of the film by constructing a three-dimensional crosslinking network; leveling agents and defoamers improve the adhesive's flowability and defoaming effect, respectively, preventing defects such as pinholes and bubbles from affecting the bonding effect after application; and thickeners adjust the system viscosity to 2500-5000 mPa·s, balancing application requirements. The process ensures operability and coating uniformity, while the preservatives guarantee the stability of the system during storage and prevent microbial growth that could lead to demulsification and stratification. Deionized water serves as the dispersion medium, and the proportions and addition processes of each component ensure good compatibility and dispersibility of the entire adhesive system, effectively avoiding stratification and demulsification. Each component performs its own function while working synergistically to ultimately produce a high-performance water-based automotive interior adhesive that requires no pretreatment of the PP substrate, has high adhesion, and also possesses excellent film-forming properties, temperature resistance, stability, and environmental friendliness.

[0036] Compared with the prior art, the beneficial effects of the present invention are:

[0037] 1. Significantly improves adhesion performance to low surface energy substrates, achieving pretreatment-free bonding: This invention modifies the surface of waterborne polyurethane emulsion with a specific structural coupling agent, breaking through the bottleneck of insufficient interfacial bonding between traditional waterborne adhesives and low surface energy, non-polar substrates such as PP. High peel strength can be achieved without pretreatment processes such as flame, corona, or primer on PP substrates, greatly simplifying the bonding process of automotive interior parts.

[0038] 2. Balancing excellent film-forming properties, flexibility, and temperature resistance and durability: The modified waterborne polyurethane emulsion improves interfacial adhesion while retaining the excellent film-forming properties, flexibility, and temperature resistance of polyurethane itself. Through synergistic compounding with core-shell acrylic emulsion, it effectively solves the problems of traditional waterborne adhesives in achieving both film-forming properties and temperature resistance, as well as the problem of easy debonding and cracking under high and low temperature cycling conditions, ensuring the reliability of the adhesive film for long-term use. Attached Figure Description

[0039] Figure 1 This is a comparison of the infrared spectra of the modified waterborne polyurethane emulsion and the waterborne polyurethane emulsion of the present invention. Detailed Implementation

[0040] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are merely 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.

[0041] Example 1

[0042] Preparation of a high-performance water-based automotive interior adhesive:

[0043] 1. Preparation of coupling agents:

[0044] ;

[0045] CAS number for raw material 1: 2530-83-8;

[0046] CAS number for raw material 2: 6281-42-1;

[0047] Under continuous nitrogen protection, 2.87 g of raw material 2 was first added to the reaction flask, followed by the injection of 25.0 mL of anhydrous methanol using an anhydrous syringe. Stirring was started until the solid was completely dissolved. The reaction flask was then placed in an ice-water bath at 0°C. 4.7 mL of raw material 1 was transferred to a dry constant-pressure dropping funnel and slowly added dropwise to the reaction solution over 15 minutes with stirring at 0°C. After the addition was complete, the ice-water bath was removed, and the reaction system was allowed to return to room temperature naturally. The reaction flask was then transferred to a preheated oil bath and heated to 60°C for reflux reaction. Stirring was continued for 16 hours under nitrogen protection. After the reaction was completed, the reaction solution was cooled to room temperature. First, most of the solvent was removed using a rotary evaporator. Ice water was added to quench the remaining viscous liquid. Then, the mixture was transferred to a separatory funnel, and dichloromethane was added for separation extraction. The organic phase was collected, and the aqueous phase was extracted again with dichloromethane. The organic phases were combined and washed with ice-saturated brine. The washed organic layer was transferred to an Erlenmeyer flask, dried with anhydrous sodium sulfate for 30 minutes, filtered, and the filter cake was washed with a small amount of dichloromethane. The mixture was concentrated using a rotary evaporator to obtain the crude product. The crude product was placed in a high-vacuum short-path distillation apparatus and heated at 0.1 mmHg vacuum and 80°C for 2 hours to completely remove residual solvent, trace amounts of water, and volatile impurities, yielding 6.06 g of coupling agent.

[0048] Structural assessment:

[0049] NMR of coupling agents 1 HNMR(Chloroform-d)δ:5.56(t,1H),3.89-3.70(m,2H),3.70-3.61(m,2H),3.59(s ,9H),3.49-3.31(m,9H),3.02-2.83(m,3H),2.67(m,1H),1.65(s,2H),0.75(t,2H).

[0050] 2. Preparation of modified waterborne polyurethane emulsion:

[0051] Step 1: Place the aqueous polyurethane emulsion in a constant temperature water bath, control the temperature at 40℃, stir at 200r / min, stir for 20min to remove air bubbles from the emulsion, and obtain a pretreated emulsion.

[0052] Step 2: Add the coupling agent to anhydrous ethanol, stir to dissolve, and prepare a coupling agent ethanol solution with a mass concentration of 10%. During the stirring process, control the temperature at 27°C and the stirring speed at 120 r / min until the solution is homogeneous and transparent, and set aside for later use.

[0053] Step 3: Slowly add the coupling agent ethanol solution to the pretreated emulsion at a dropping rate of 2 mL / min. During the dropping process, maintain a stirring speed of 250 r / min and a reaction temperature of 45°C. After the dropping is completed, continue stirring at a constant temperature for 3 hours to complete the modification of the surface of the waterborne polyurethane emulsion by the coupling agent.

[0054] Step 4: Cool the emulsion after the reaction in Step 3 to room temperature, adjust the pH of the emulsion to 7.2 with triethanolamine, and then filter it through a 140-mesh filter to remove insoluble impurities, thereby obtaining the modified waterborne polyurethane emulsion.

[0055] 3. Raw material components by weight:

[0056] 40 parts of modified waterborne polyurethane emulsion: the modified waterborne polyurethane emulsion prepared in the above steps;

[0057] 22 parts of acrylic emulsion: S-05 pure acrylic emulsion with a glass transition temperature of 12℃ and a solid content of 48±1%, purchased from Jiangsu Shengda New Material Technology Co., Ltd.

[0058] 10 parts of tackifying resin: terpene resin;

[0059] 4 parts of film-forming aid: dipropylene glycol butyl ether;

[0060] Crosslinking agent 1.5 parts: trimethylolpropane-tris(2-aziridinyl)propionate;

[0061] 0.3 parts of leveling agent: BYK-306 leveling agent;

[0062] 0.3 parts of defoamer: BYK-024 defoamer;

[0063] Thickener 0.6 parts: Hydroxyethyl cellulose thickener;

[0064] Preservative 0.1 parts: methylchloroisothiazolinone;

[0065] 18 parts deionized water.

[0066] 4. Preparation method:

[0067] Step A: Add the above-mentioned proportion of deionized water to the reactor, start stirring, control the stirring speed at 230 r / min and the temperature inside the reactor at 30℃, add the tackifying resin and film-forming aid in sequence, and continue stirring for 25 min until the raw materials are completely mixed and homogeneous to obtain the mixed base liquid.

[0068] Step B: Slowly add modified waterborne polyurethane emulsion and acrylic emulsion dropwise to the mixed base liquid, controlling the drop rate at 3 mL / min. Keep the stirring speed constant during the dropwise addition. After the dropwise addition is completed, continue stirring for 40 min to obtain the composite emulsion.

[0069] Step C: Add crosslinking agent, leveling agent and defoamer to the composite emulsion in sequence, stir continuously for 20 min, then add thickener, adjust the stirring speed to 180 r / min, stir for 12 min until the system viscosity is uniform, adjust the system viscosity to 3500 mPa·s, then add preservative, and continue stirring for 8 min to obtain a uniform mixture.

[0070] Step D: Filter the homogeneous mixture through a 200-mesh filter to remove insoluble impurities from the system. Then, place the filtered mixture in a constant temperature environment of 28°C and let it stand for 1.5 hours. During the standing process, use 120W ultrasonic power to degas the mixture for 8 minutes every 30 minutes to completely remove residual air bubbles from the system, thus obtaining a high-performance water-based automotive interior adhesive.

[0071] Example 2

[0072] The preparation of a high-performance water-based automotive interior adhesive is carried out by referring to the preparation method in Example 1, except that the mass fractions of each raw material in the components are replaced, and other operations are kept the same as in Example 1.

[0073] Raw material components by weight:

[0074] The mixture contains 30 parts modified waterborne polyurethane emulsion, 15 parts acrylic emulsion, 5 parts tackifying resin, 2 parts film-forming aid, 0.5 parts crosslinking agent, 0.1 parts leveling agent, 0.1 parts defoamer, 0.2 parts thickener, 0.05 parts preservative, and 10 parts deionized water.

[0075] Example 3

[0076] The preparation of a high-performance water-based automotive interior adhesive is carried out by referring to the preparation method in Example 1, except that the mass fractions of each raw material in the components are replaced, and other operations are kept the same as in Example 1.

[0077] Raw material components by weight:

[0078] 50 parts modified waterborne polyurethane emulsion, 30 parts acrylic emulsion, 15 parts tackifying resin, 6 parts film-forming aid, 3 parts crosslinking agent, 0.5 parts leveling agent, 0.5 parts defoamer, 1 part thickener, 0.3 parts preservative, and 25 parts deionized water.

[0079] Comparative Example 1

[0080] The preparation of a high-performance waterborne automotive interior adhesive follows the same procedure as in Example 1, except that the modified waterborne polyurethane emulsion is replaced with a regular waterborne polyurethane emulsion, while other operations remain the same as in Example 1.

[0081] Comparative Example 2

[0082] The preparation of a high-performance water-based automotive interior adhesive follows the same procedure as in Example 1, except that the coupling agent is replaced with silane coupling agent KH-550, and all other operations remain the same as in Example 1.

[0083] Comparative Example 3

[0084] The preparation of a high-performance water-based automotive interior adhesive follows the preparation method in Example 1, but without the addition of a crosslinking agent, and other operations are the same as in Example 1.

[0085] Comparative Example 4

[0086] The preparation of a high-performance waterborne automotive interior adhesive follows the same procedure as in Example 1, except that the mass fraction of the modified waterborne polyurethane emulsion is replaced with 15 parts, while other operations remain the same as in Example 1.

[0087] Performance testing

[0088] 1.180° Peel Strength Test: In accordance with GB / T 2790-1995 standard, the 180° peel strength of the automotive interior adhesives prepared in the examples and comparative examples was tested, and the results are shown in the table below.

[0089] 2. Tensile shear strength test: According to GB / T 7124-2008 standard, the tensile shear strength of the automotive interior adhesive prepared in the examples and comparative examples was tested as maximum breaking load / bond area. The results are shown in the table below.

[0090] 3. Moisture and heat resistance test: The bonded sample was placed in a constant temperature and humidity chamber at a temperature of (60±2)℃ and a relative humidity of (90±5)% for 7 days. After being removed, it was allowed to recover at room temperature for 2 hours. The tensile shear strength was tested after aging, and the tensile shear strength retention rate was calculated. The results are shown in the table below.

[0091] 4. Volatile Organic Compound (VOC) Content Test: In accordance with GB 33372-2020 standard, the VOC content of the automotive interior adhesives prepared in the examples and comparative examples was tested by gas chromatography. The results are shown in the table below.

[0092] Table 1. Performance Test Results

[0093] 180° peel strength (N / 25mm) Tensile shear strength (MPa) Tensile shear strength retention rate (%) VOC content (g / L) Example 1 45.6 7.6 90.2 18.2 Example 2 38.8 7.0 84.4 12.1 Example 3 42.7 7.9 86.9 21.6 Comparative Example 1 12.1 2.5 65.1 19.5 Comparative Example 2 25.4 4.4 72.6 17.6 Comparative Example 3 35.9 5.0 58.3 16.8 Comparative Example 4 28.7 4.2 75.1 15.7

[0094] Performance test results show that the interior adhesive prepared using the formulation of this invention is significantly superior to the comparative examples in terms of peel strength, shear strength, and resistance to humid heat. This fully demonstrates the core role of modifying waterborne polyurethane emulsion with a specific structural coupling agent in improving the adhesion to non-polar substrates. Data trend comparisons reveal that using ordinary polyurethane emulsions, replacing with other types of coupling agents, lacking crosslinking agents, or reducing the proportion of core components all lead to a significant decrease in the mechanical strength and environmental durability of the adhesive. However, the embodiments of this invention, through precise synergy of components, achieve stronger interfacial bonding and long-term stability while maintaining the environmental advantage of low volatility.

[0095] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-performance water-based automotive interior adhesive, characterized in that, The product is composed of the following components by weight: 30-50 parts modified waterborne polyurethane emulsion, 15-30 parts acrylic emulsion, 5-15 parts tackifying resin, 2-6 parts film-forming aid, 0.5-3 parts crosslinking agent, 0.1-0.5 parts leveling agent, 0.1-0.5 parts defoamer, 0.2-1 part thickener, 0.05-0.3 parts preservative, and 10-25 parts deionized water. The modified waterborne polyurethane emulsion is formed by modifying the surface of a waterborne polyurethane emulsion with a coupling agent; The chemical structure of the coupling agent is as follows: .

2. The high-performance water-based automotive interior adhesive according to claim 1, characterized in that, The aqueous polyurethane emulsion is an aliphatic aqueous polyurethane emulsion with a solid content of 35-55%.

3. The high-performance water-based automotive interior adhesive according to claim 1, characterized in that, The modified waterborne polyurethane emulsion is prepared by: Step 1: Place the aqueous polyurethane emulsion in a constant temperature water bath, control the temperature at 35-45℃, stir at 150-250 r / min, stir for 15-25 min to remove air bubbles from the emulsion, and obtain a pretreated emulsion. Step 2: Add the coupling agent to anhydrous ethanol, stir to dissolve, and prepare a coupling agent ethanol solution. During the stirring process, control the temperature at 25-30℃ and the stirring speed at 100-150 r / min until the solution is homogeneous and transparent. Step 3: Slowly add the coupling agent ethanol solution to the pretreated emulsion at a rate of 1-3 mL / min. During the addition, maintain a stirring speed of 200-300 r / min and a reaction temperature of 40-50℃. After the addition is completed, continue stirring at a constant temperature for 2-4 hours to complete the modification of the surface of the waterborne polyurethane emulsion by the coupling agent. Step 4: Cool the emulsion after the reaction in Step 3 to room temperature, adjust the pH value of the emulsion to 7.0-8.0, and then filter it with a 100-200 mesh filter to remove insoluble impurities, thereby obtaining the modified waterborne polyurethane emulsion.

4. The high-performance water-based automotive interior adhesive according to claim 1, characterized in that, The acrylic emulsion is a pure acrylic emulsion with a glass transition temperature of -20°C to 15°C and a solid content of 40%-50%.

5. The high-performance water-based automotive interior adhesive according to claim 1, characterized in that, The tackifying resin is one or more of rosin resin, terpene resin, and petroleum resin.

6. The high-performance water-based automotive interior adhesive according to claim 1, characterized in that, The film-forming aid is one or more of dipropylene glycol butyl ether, ethylene glycol butyl ether, and dodecyl alcohol ester; The crosslinking agent is trimethylolpropane-tris(2-aziridinyl)propionate.

7. The high-performance water-based automotive interior adhesive according to claim 1, characterized in that, The leveling agent is one or more of BYK-300 and BYK-306; The defoamer is one or more of BYK-024 and polyether ester GPE-10; The thickener is hydroxyethyl cellulose, carbomer 940, and rheolate 255; The preservative is one or more of methylchloroisothiazolinone and benzisothiazolinone.

8. A method for preparing a high-performance water-based automotive interior adhesive according to any one of claims 1-7, characterized in that, Includes the following steps: Step A: Add the deionized water to the reaction vessel, turn on the stirrer, control the stirring speed to be 180-280 r / min and the temperature to be 25-35℃, add the tackifying resin and film-forming aid in sequence, stir for 20-30 min until the mixture is uniform, and obtain the mixed base liquid; Step B: Add the modified waterborne polyurethane emulsion and acrylic emulsion to the mixed base liquid, control the dropping rate to 2-4 mL / min, keep the stirring speed constant during the dropping process, and continue stirring for 30-45 min after the dropping is completed to obtain the composite emulsion; Step C: Add the crosslinking agent, leveling agent, and defoamer to the composite emulsion in sequence, stir for 15-25 minutes, then add the thickener, adjust the stirring speed to 150-200 r / min, stir for 10-15 minutes until the system viscosity is uniform, then add the preservative, and continue stirring for 5-10 minutes to obtain a uniform mixture. Step D: Filter the homogeneous mixture through a 150-250 mesh filter to remove insoluble impurities, and then let it stand in a constant temperature environment of 25-30℃ for 1-2 hours to remove residual air bubbles in the system, thus obtaining a high-performance water-based automotive interior adhesive.

9. The method for preparing a high-performance water-based automotive interior adhesive according to claim 8, characterized in that, In step C, the viscosity of the system is adjusted to 2500-5000 mPa·s; In step D, during the settling process, ultrasonic degassing is performed for 5-10 minutes every 30 minutes, with an ultrasonic power of 100-150W.

10. A high-performance water-based automotive interior adhesive according to any one of claims 1-7, characterized in that, The interior adhesive is used to bond PP substrates for automotive interiors to leather, fabric, PVC, and ABS substrates. After bonding, it is cured at 25°C and 50%RH for 24 hours, and there is no need to pre-treat the PP substrate with flame, corona, or primer.

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