Stable rod bush rubber secondary bonding glue and its preparation method and application

Abstract

The application belongs to the technical field of rubber bonding glue, and specifically provides a stable rod bushing rubber secondary bonding glue, a preparation method and application thereof. The glue comprises, by weight, 100 parts of water-based polyurethane dispersion, 3-20 parts of LA amphiphilic coupling agent, 0.5-5 parts of thixotropic filler, and 0.1-3 parts of crosslinking agent. The LA amphiphilic coupling agent is an amphiphilic coupling agent prepared by grafting reaction of corn fiber glue and thioctic acid. The preparation method comprises the following steps: dissolving the LA amphiphilic coupling agent in water, adding the water-based polyurethane dispersion, stirring and mixing, adding the thixotropic filler, the crosslinking agent and optional additives, and filtering to obtain the glue. In application, the glue is coated on the inner surface of the stable rod bushing, and is subjected to compression assembly and heating and curing. The glue is environmentally friendly, has high bonding strength, good moisture and heat aging resistance, and is suitable for secondary bonding of vulcanized rubber bushing and metal stable rod.

Description

Technical Field

[0001] This application belongs to the field of rubber adhesive technology, and in particular relates to a secondary adhesive for bonding stabilizer bar bushing rubber, its preparation method and application. Background Technology

[0002] The stabilizer bar in a car's suspension system is a key component for suppressing body roll and improving driving stability. The stabilizer bar is typically connected to the car body or frame via rubber bushings, which provide vibration damping, cushioning, and sound insulation. In traditional manufacturing processes, the rubber bushing and metal stabilizer bar are often bonded together using vulcanization, meaning the rubber and metal frame are integrally formed during the vulcanization process. However, with the development of platform-based and modular automotive production, and the demands of the aftermarket repair and modification industry, there is an increasing need for secondary bonding between the vulcanized rubber bushing and the metal stabilizer bar. This involves using adhesives at room temperature or medium temperature to assemble and bond the inner hole of the vulcanized rubber bushing to the outer surface of the metal stabilizer bar.

[0003] Compared to primary vulcanization bonding, secondary bonding faces more demanding interfacial conditions. Vulcanized rubber surfaces have formed a complete cross-linked network with few surface-active groups and low surface energy. Furthermore, during processing, storage, and transportation, low-molecular-weight substances such as release agents, plasticizers, antioxidants, and waxes easily remain on the surface of rubber products, further weakening the bonding strength at the interface. Metal stabilizer bars typically have a phosphated film or electrophoretic coating. On the one hand, this anti-corrosion layer needs to be retained to ensure the stabilizer bar's corrosion resistance; on the other hand, the weak boundary layer effect of the phosphated film also increases the bonding difficulty. In addition, stabilizer bar bushings are subjected to complex dynamic shear, compression, and torsional loads during vehicle operation and are exposed to harsh environments such as high temperature, high humidity, salt spray, and oil contamination for extended periods. Therefore, the secondary bonding layer not only needs sufficient initial bond strength but also excellent aging resistance, damp heat resistance, and fatigue resistance.

[0004] Currently, adhesives used for secondary bonding of stabilizer bar bushings mainly include solvent-based neoprene rubber, solvent-based polyurethane adhesives, reactive epoxy adhesives, and some water-based adhesives. While solvent-based adhesives offer advantages such as fast drying, high initial tack, and good wettability on low surface energy substrates, they contain large amounts of organic solvents, resulting in high emissions of volatile organic compounds and limiting their application. Reactive epoxy adhesives typically require long curing times, lack flexibility, and struggle to adapt to stresses generated at the rubber-metal interface due to differences in thermal expansion coefficients and dynamic deformation. Existing water-based adhesives, while more environmentally friendly, generally suffer from insufficient adhesion to vulcanized rubber and metal surfaces with phosphate coatings, as well as poor water resistance and resistance to humid heat aging. Water-based polyurethane adhesives, in particular, contain polar groups such as urethane esters in their molecular chains, exhibiting some adhesion to metals, but often lack sufficient bonding strength to non-polar or weakly polar vulcanized rubber surfaces, making the interface prone to hydrolysis and failure in humid and hot environments.

[0005] Therefore, developing an environmentally friendly, easy-to-apply, and highly adhesive bonding agent for stabilizer bar bushing rubber that exhibits excellent bonding strength to both vulcanized rubber and phosphated metal surfaces, while also possessing good aging resistance, has significant engineering application value and market potential. Summary of the Invention

[0006] To address the aforementioned issues, this application provides a secondary adhesive for bonding stabilizer bar bushing rubber, its preparation method, and its application.

[0007] This application first provides a secondary adhesive for bonding stabilizer bar bushing rubber, comprising the following components by weight: 100 parts of waterborne polyurethane dispersion; 3-20 parts of LA biparental coupling agent; Thixotropic filler 0.5~5 parts; Crosslinking agent 0.1~3 parts; The LA amphiphilic coupling agent is an amphiphilic coupling agent prepared by grafting corn cellulose gum and thioctic acid.

[0008] Furthermore, the aqueous polyurethane dispersion is a castor oil-based aqueous polyurethane dispersion with a solid content of 20% to 50%; the amount of the LA amphiphilic coupling agent is 5 to 10 parts; the crosslinking agent is selected from at least one of crosslinking agent WHT-100, crosslinking agent 202, and crosslinking agent XR-100, and the amount is 0.5 to 2 parts.

[0009] Furthermore, it also includes 0.1 to 1.5 parts of antioxidant and / or 0.05 to 1 part of defoamer; the antioxidant is a hindered phenolic antioxidant, and the defoamer is an organosilicon defoamer or a polyether defoamer.

[0010] Furthermore, it also includes 0.1 to 8 parts of Al-Si composite sol; the Al-Si composite sol is prepared from mercaptosilane and aluminum lactate.

[0011] Furthermore, the Al-Si composite sol is prepared by the following method: 3-mercaptopropyltrimethoxysilane is condensed in a surfactant and an alkaline aqueous solution to form a silica sol; the silica sol is mixed with an aluminum lactate solution, the pH is adjusted to neutral, and rotary evaporated until the solid content is 65%. Preferably, the surfactant is poloxamer F127. The alkaline aqueous solution is 30% ammonia solution by mass concentration.

[0012] More preferably, the Al-Si composite sol is prepared by the following method: 500 mg of poloxamer F127 is added to 10 mL of deionized water and stirred to dissolve. Then, 500 μL of 30% ammonia water and 400 μL of 3-mercaptopropyltrimethoxysilane are added and stirred continuously overnight to obtain a silica sol. Then, 15 mL of the silica sol is mixed with 35 mL of deionized water, and then 100 mL of 2.5 g / L aluminum lactate solution is added. The mixture is stirred at 500 r / min for 12 h at room temperature, the pH is adjusted to neutral, and then the mixture is centrifuged at 10000 r / min. The supernatant is discarded to obtain the final product.

[0013] Furthermore, the thixotropic filler is at least one of fumed silica, precipitated silica, and organobentonite.

[0014] Furthermore, the preparation method of the LA amphiphilic coupling agent includes the following steps: Corn fiber gum is dissolved in deionized water to prepare a pretreatment solution with a mass concentration of 5% to 20%. Add ascorbic acid and hydrogen peroxide to the pre-prepared solution, stir, and then add an ethanol solution of thioctic acid to carry out the grafting reaction; The pH was adjusted to 9-11 with alkali, the precipitate was removed by centrifugation, the supernatant was dialyzed and lyophilized to obtain the LA amphiphilic coupling agent.

[0015] This application provides a method for preparing the above-mentioned secondary adhesive for bonding stabilizer bar bushing rubber, comprising the following steps: The LA amphiphilic coupling agent was dissolved in deionized water to obtain an aqueous solution of the coupling agent; The aqueous coupling agent solution was added to the aqueous polyurethane dispersion and stirred for 20-40 min at 30-50°C and 200-500 r / min to obtain a mixture. Add thixotropic filler, crosslinking agent, and optional antioxidant and / or defoamer to the mixture, and continue stirring for 20-40 minutes; pass through a 150-250 mesh filter to obtain the secondary adhesive for bonding the stabilizer bushing rubber.

[0016] Furthermore, when the adhesive raw materials include Al-Si composite sol, the Al-Si composite sol is added together with the thixotropic filler and crosslinking agent.

[0017] This application also provides an application of a secondary adhesive for bonding stabilizer bar bushing rubber, characterized in that: the use of the above-mentioned secondary adhesive for bonding stabilizer bar bushing rubber includes the following steps: Pre-treatment is performed on the surface of the stabilizer bar and the inner hole of the stabilizer bar bushing. The adhesive is applied to the inner surface of the stabilizer bar bushing and / or the outer surface of the stabilizer bar to form a wet film; Press the stabilizer bar into the inner hole of the stabilizer bar bushing before the wet film is surface dry; The press-fitted components are cured with hot air to obtain a secondary bonded assembly of stabilizer bar and stabilizer bar bushing.

[0018] Compared with the prior art, this application has the following beneficial effects: 1. This application utilizes an LA amphiphilic coupling agent prepared by grafting corn cellulose rubber with thioctic acid. The corn cellulose rubber molecular chain is rich in polar groups such as hydroxyl groups, which can form physical cross-linking points with the waterborne polyurethane molecular chain, increasing the cohesive strength of the adhesive layer. The grafted thioctic acid groups can undergo sulfur exchange reactions with the residual vulcanization cross-linking network on the surface of the vulcanized rubber, forming covalent bonds. Furthermore, it coordinates with iron and zinc ions in the phosphate film on the surface of the metal stabilizer, forming interfacial chemical bonds. During the adhesive curing process, this amphiphilic coupling agent can spontaneously migrate and accumulate at the rubber / metal interface, reducing interfacial tension and forming a gradient interfacial layer, thereby significantly improving secondary bonding strength and resistance to damp heat aging.

[0019] 2. This application introduces a crosslinking agent and an Al-Si composite sol. The crosslinking agent forms a coordination crosslinking network with the LA amphiphilic coupling agent, improving the toughness and fatigue resistance of the adhesive layer. Simultaneously, the iron salt catalyzes the interfacial sulfur exchange reaction, promoting covalent bonding between the coupling agent and the vulcanized rubber surface. The silicon-based portion of the Al-Si composite sol can form Al-O-Si and Si-O-Si networks, enhancing adhesive strength. Aluminum ions possess Lewis acidity, further activating disulfide bonds and sulfur exchange reactions, enabling the adhesive layer to achieve a high crosslinking density within a shorter curing time, thereby improving initial adhesive strength and fatigue resistance. Attached Figure Description

[0020] Figure 1 This is a comparative schematic diagram of the initial structure and the structure after secondary adhesive spraying of the stabilizer bar bushing of this application.

[0021] Figure 2 This is a schematic diagram of the Z (closed-end) analysis of the secondary bonding assembly of the stabilizer bar and stabilizer bar bushing in Embodiment 1 of this application.

[0022] Figure 3 This is a schematic diagram of the Z (closed-angle) stress-displacement curve of the secondary bonding assembly of the stabilizer bar and stabilizer bar bushing in Embodiment 1 of this application.

[0023] Figure 4 This is a schematic diagram of the X (opening) analysis of the secondary bonding assembly of the stabilizer bar and stabilizer bar bushing in Embodiment 1 of this application.

[0024] Figure 5 This is a schematic diagram of the X (opening) stress-displacement curve of the secondary bonding assembly of the stabilizer bar and stabilizer bar bushing in Embodiment 1 of this application.

[0025] Figure 6 This is a schematic diagram of the Y (axial) analysis of the secondary bonding assembly of the stabilizer bar and stabilizer bar bushing in Embodiment 1 of this application.

[0026] Figure 7 This is a schematic diagram of the Y (axial) stress-displacement curve of the secondary bonding assembly of the stabilizer bar and stabilizer bar bushing in Embodiment 1 of this application.

[0027] Figure 8 This is a schematic diagram of the Ry (torsion) analysis of the secondary bonding assembly of the stabilizer bar and stabilizer bar bushing in Embodiment 1 of this application.

[0028] Figure 9 This is a schematic diagram of the Ry (torsional) torque-angle curve of the secondary bonding assembly of the stabilizer bar and stabilizer bar bushing in Embodiment 1 of this application.

[0029] Figure 10 This is a schematic diagram showing the test analysis of the damaged area after the secondary bonding assembly of the stabilizer bar and stabilizer bar bushing in Embodiment 1 of this application.

[0030] Figure 11 This is a schematic diagram of the test and analysis of the damaged area after the secondary bonding assembly of the stabilizer bar and stabilizer bar bushing in Embodiment 2 of this application is bonded.

[0031] Figure 12 This is a schematic diagram illustrating the test and analysis of the damaged area after the secondary bonding assembly of the stabilizer bar and stabilizer bar bushing, which is a comparative example of this application.

[0032] Figure 13 This is a schematic diagram showing the test results of the secondary adhesive bonding performance of the stabilizer bar bushing rubber in Examples 1-2 and the comparative example of this application.

[0033] Figure 14 This is a schematic diagram of the test process of the glue bonding area grid method for the secondary bonding of stabilizer bar bushing rubber in Examples 1-2 and the comparative example of this application.

[0034] Figure 15This is a schematic diagram illustrating the statistical process of the number of adhesive grids for the secondary bonding area of ​​the stabilizer bushing rubber in Examples 1-2 and the comparative example of this application. Detailed Implementation

[0035] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the embodiments of this application. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0037] When using “including,” “having,” and “contains” as described herein, the intention is to cover non-exclusive inclusion, unless an explicit qualifying term such as “only,” “consisting of,” etc., is used, in which case another component may be added.

[0038] The terms "preferred," "more preferably," "better," and "even better" used in this application refer to embodiments of this application that provide certain beneficial effects under certain circumstances. However, other embodiments may also be preferred under the same or other circumstances. Furthermore, the description of one or more preferred embodiments does not imply that other embodiments are unavailable, nor is it intended to exclude other embodiments from the scope of this application. That is, in this application, "preferred," "more preferably," "better," and "even better" are merely descriptions of implementations or embodiments with better effects, but do not constitute a limitation on the scope of protection of this application.

[0039] In this application, terms such as "further," "even more," and "particularly" are used for descriptive purposes and indicate differences in content, but should not be construed as limiting the scope of protection of this application.

[0040] In this application, "at least one" means one or more, such as one, two, or more. "Multiple" or "several" means at least two, such as two, three, etc., and "multi-layered" means at least two layers, such as two layers, three layers, etc., unless otherwise explicitly specified. In the description of this application, "several" means at least one, such as one, two, etc., unless otherwise explicitly specified.

[0041] When a numerical range is disclosed herein, the range is considered continuous and includes the minimum and maximum values ​​of the range, as well as every value between the minimum and maximum values. Furthermore, when the range refers to integers, it includes every integer between the minimum and maximum values ​​of the range. Additionally, when multiple ranges are provided to describe a feature or characteristic, the ranges may be combined. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all subranges to which they are incorporated.

[0042] Unless otherwise specified, all steps in this application may be performed sequentially or randomly. For example, the method comprising steps (a) and (b) indicates that the method may include steps (a) and (b) performed sequentially, or it may include steps (b) and (a) performed sequentially. For example, the mention that the method may also include step (c) indicates that step (c) may be added to the method in any order; for example, the method may include steps (a), (b), and (c), or it may include steps (a), (c), and (b), or it may include steps (c), (a), and (b), etc. Unless otherwise stated, singular terms may include plural forms and should not be construed as having a quantity of one.

[0043] The present application will be further illustrated by the following examples, but these examples do not limit the scope of the present application.

[0044] When numerical ranges are given in the embodiments, it should be understood that, unless otherwise stated in this application, both endpoints of each numerical range and any value between the two endpoints may be selected. Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. All reagents or instruments whose manufacturers are not specified are conventional products that can be purchased commercially. In addition to the specific methods, equipment, and materials used in the embodiments, based on the knowledge of the prior art possessed by one of ordinary skill in the art and the description in this application, any prior art methods, equipment, and materials similar to or equivalent to those described, used, or made by the methods, equipment, and materials in the embodiments of this application may be used to implement this application.

[0045] Unless otherwise specified, all raw materials used in this application are commercially available.

[0046] The castor oil-based waterborne polyurethane dispersion was prepared by reacting castor oil, polyether N210, toluene diisocyanate, and dimethylolpropionic acid. DMPA = 5 wt%, the mass ratio of polyether N210 to castor oil was 7:3, the NCO / OH molar ratio was 1.3, and the solid content of the castor oil-based waterborne polyurethane dispersion was 30%. The average particle size of the fumed silica was 30 nm. The silicone defoamer was designated AFE-3168.

[0047] Preparation Example The preparation method of LA amphiphilic coupling agent includes the following steps: 20g of corn cellulose gum is added to deionized water and fully dissolved to prepare a pretreatment solution with a mass concentration of 10%. Then, 0.75g of ascorbic acid and 1.5mL of 30% hydrogen peroxide are added to the pretreatment solution. After stirring for 30min, anhydrous ethanol solution containing 5g of lipoic acid is slowly added. The mixture is stirred overnight at room temperature. Then, the pH is slowly adjusted to 10 with 5mol / L sodium hydroxide solution. The precipitate is removed by centrifugation, and the resulting supernatant is dialyzed and lyophilized to obtain the final product.

[0048] Example 1 The secondary adhesive for bonding the stabilizer bushing rubber in this embodiment comprises the following raw materials in parts by weight: 100 parts of 30% solid content castor oil-based waterborne polyurethane dispersion, 7.5 parts of LA amphiphilic coupling agent, 1 part of fumed silica, 0.5 parts of antioxidant 1010, 0.3 parts of silicone defoamer, and 1 part of crosslinking agent WHT-100.

[0049] The preparation method of the secondary adhesive for the stabilizer bushing rubber in this embodiment includes the following steps: dissolving the LA amphiphilic coupling agent in a small amount of deionized water and then adding it to the dispersion, stirring at 40°C and 300 r / min for 30 min, then adding the remaining additives in sequence, stirring for 30 min, and filtering through a 200 mesh to obtain the final product.

[0050] The secondary adhesive used in this embodiment for bonding the stabilizer bar bushing rubber is used for secondary bonding of the stabilizer bar and stabilizer bar bushing. The specific bonding process is as follows: Substrate pretreatment: Wipe the surface of the stabilizer bar with anhydrous ethanol to remove grease, retaining the original phosphating film; wipe the inner hole of the bushing with anhydrous ethanol to remove surface impurities, and let it air dry for 10 minutes; Glue application and assembly: such as Figure 1 As shown, the glue is sprayed onto the inner surface of the stabilizer bar bushing (material is NR-60 ShA, secondary vulcanization), the wet film thickness is about 150μm, and the stabilizer bar is pressed into place within 30s; Curing: Curing at 160°C for 1 hour in the assembly line drying tunnel, then cooling to room temperature to obtain a secondary bonded assembly of the stabilizer bar and stabilizer bar bushing.

[0051] Example 2 The difference between this embodiment and Example 1 is that 3 parts of Al-Si composite sol are added to the adhesive formulation. During preparation, this sol is added along with other additives. The rest is the same as in Example 1.

[0052] Comparative Example The difference between this comparative example and Example 1 is that an equal amount of silane coupling agent KH-550 is used instead of LA amphiphilic coupling agent.

[0053] Performance testing 1. Take the secondary bonding assembly of the stabilizer bar and stabilizer bar bushing from Example 1, and analyze it in four dimensions: Z (closed), X (open), Y (axial), and Ry (torsion). Obtain the stress-displacement curves for Z (closed), X (open), and Y (axial), and the torque-angle curve for Ry (torsion). The test results are as follows: Figures 2-9 As shown.

[0054] 2. Take the secondary bonding assemblies of stabilizer bars and stabilizer bar bushings from Examples 1-2 and the comparative examples, and conduct post-bonding damage tests and analyses. The results are as follows: Figures 10-12 As shown.

[0055] 3. Take the secondary adhesive for bonding stabilizer bar bushings from Examples 1-2 and the comparative example, and conduct bonding performance tests. The test method is as follows: Select a stabilizer bar sample with a diameter of 25mm, clean it with alcohol and wipe it clean before use, and set it aside; spray the adhesive onto the inner surface of the stabilizer bar bushing, with a wet film thickness of about 150μm; use clamps and tooling fixtures to assemble the stabilizer bar sample with the stabilizer bar bushing, cure it in an oven at 160℃ for 1 hour, cool it to room temperature, and then place it in a humid heat aging chamber for aging at 60℃ and 90%RH for 15 days. Take it out and conduct bonding tests. The test conditions are: test speed 30mm / min, axial compression until the stabilizer bar bushing separates from the sample, and the peak force is the bonding force value. The test results are as follows. Figure 13 As shown (sample 1 is Example 1, sample 2 is Example 2, and sample 3 is a comparative example).

[0056] Determination of bonded area: The bonded area is determined and recorded using a grid method. A transparent plastic grid is wrapped around the sample rod after compression. The total number of grids in the bonded area is calculated, and the number of grids in the unbonded area is also counted. The ratio of well-bonded grids to the total number of grids is the bonded area ratio. The testing process is as follows: Figure 14 and Figure 15 As shown.

[0057] analyze Figures 1-15 It can be seen that the secondary adhesive used for the stabilizer bar bushing in this application has strong bonding strength, which can firmly fix the stabilizer bar to the bushing, reducing abnormal noise and wear of the stabilizer bar bushing during service and extending its service life. From Figures 2-9It can be seen that the bonding force between the stabilizer bar and the bushing is strong in all stress directions, with no adverse stress fluctuations or abrupt changes, and the interface adhesion is good. From Figure 13 As can be seen, the adhesive of this application has higher bonding strength and larger bonding area, providing higher initial bonding strength and fatigue resistance for subsequent service processes.

[0058] Although this application 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 this application should be included within the protection scope of this application.

Claims

1. A secondary adhesive for bonding stabilizer bar bushing rubber, characterized in that: By weight, it includes the following components: 100 parts of waterborne polyurethane dispersion; 3-20 parts of LA biparental coupling agent; Thixotropic filler 0.5~5 parts; Crosslinking agent 0.1~3 parts; The LA amphiphilic coupling agent is an amphiphilic coupling agent prepared by grafting corn cellulose gum and thioctic acid.

2. The secondary adhesive for bonding stabilizer bar bushing rubber according to claim 1, characterized in that: The aqueous polyurethane dispersion is a castor oil-based aqueous polyurethane dispersion with a solid content of 20% to 50%; the amount of the LA amphiphilic coupling agent is 5 to 10 parts; the crosslinking agent is selected from at least one of crosslinking agent WHT-100, crosslinking agent 202, and crosslinking agent XR-100, and the amount is 0.5 to 2 parts.

3. The secondary adhesive for bonding stabilizer bar bushing rubber according to claim 1, characterized in that: It also includes 0.1 to 1.5 parts of antioxidant and / or 0.05 to 1 part of defoamer; the antioxidant is a hindered phenolic antioxidant, and the defoamer is an organosilicon defoamer or a polyether defoamer.

4. The secondary adhesive for bonding stabilizer bar bushing rubber according to claim 1, characterized in that: It also includes 0.1 to 8 parts of Al-Si composite sol; the Al-Si composite sol is prepared from mercaptosilane and aluminum lactate.

5. The secondary adhesive for bonding stabilizer bar bushing rubber according to claim 4, characterized in that: The Al-Si composite sol was prepared by the following method: 3-mercaptopropyltrimethoxysilane was condensed in a surfactant and an alkaline aqueous solution to form a silica sol; the silica sol was mixed with an aluminum lactate solution, the pH was adjusted to neutral, centrifuged, and the supernatant was discarded to obtain the final product.

6. The secondary adhesive for bonding stabilizer bar bushing rubber according to claim 1, characterized in that: The thixotropic filler is at least one of fumed silica, precipitated silica, and organobentonite.

7. The secondary adhesive for bonding stabilizer bar bushing rubber according to claim 1, characterized in that: The preparation method of the LA amphiphilic coupling agent includes the following steps: Corn fiber gum is dissolved in deionized water to prepare a pretreatment solution with a mass concentration of 5% to 20%. Add ascorbic acid and hydrogen peroxide to the pre-prepared solution, stir, and then add an ethanol solution of thioctic acid to carry out the grafting reaction; The pH was adjusted to 9-11 with alkali, the precipitate was removed by centrifugation, the supernatant was dialyzed and lyophilized to obtain the LA amphiphilic coupling agent.

8. A method for preparing a secondary adhesive for bonding stabilizer bar bushing rubber as described in any one of claims 1 to 7, characterized in that: Includes the following steps: The LA amphiphilic coupling agent was dissolved in deionized water to obtain an aqueous solution of the coupling agent; The aqueous coupling agent solution was added to the aqueous polyurethane dispersion and stirred for 20-40 min at 30-50°C and 200-500 r / min to obtain a mixture. Add thixotropic filler, crosslinking agent, and optional antioxidant and / or defoamer to the mixture, and continue stirring for 20-40 minutes; pass through a 150-250 mesh filter to obtain the secondary adhesive for bonding the stabilizer bushing rubber.

9. The method for preparing the secondary adhesive for bonding stabilizer bar bushing rubber according to claim 8, characterized in that: When the adhesive raw materials include Al-Si composite sol, the Al-Si composite sol is added together with the thixotropic filler and crosslinking agent.

10. An application of a secondary adhesive for bonding stabilizer bar bushing rubber, characterized in that: The method of using the secondary adhesive for bonding stabilizer bar bushing rubber according to any one of claims 1 to 7 includes the following steps: Pre-treatment is performed on the surface of the stabilizer bar and the inner hole of the stabilizer bar bushing. The adhesive is applied to the inner surface of the stabilizer bar bushing and / or the outer surface of the stabilizer bar to form a wet film; Press the stabilizer bar into the inner hole of the stabilizer bar bushing before the wet film is surface dry; The press-fitted components are cured with hot air to obtain a secondary bonded assembly of stabilizer bar and stabilizer bar bushing.

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