Rubber composite material as well as preparation method and application thereof

Abstract

The invention provides a rubber composite material as well as a preparation method and application thereof, and belongs to the technical field of bridge supports. The rubber composite material comprises the following raw materials in parts by mass: 100 parts of matrix resin, 35-45 parts of hydroxyl modified fumed silica, 8-12 parts of a plasticizer, 3-5 parts of nano-zinc oxide, 3-5 parts of a composite anti-aging agent, 3-4 parts of a coloring agent, 2-2.8 parts of a cross-linking agent, 1-2 parts of a coupling agent and 0.05-0.1 part of a platinum complex catalyst, wherein the composite anti-aging agent comprises a hindered amine stabilizer and an organic tin antioxidant. The obtained rubber composite material is excellent in weather resistance, free of cracking after ozone exposure and wide in temperature adaptability, the tensile strength is improved by 20%, the compression set is reduced by 52%, the mechanical property is obviously improved, the rubber composite material is applied to a bridge support, the service life of the prepared support can reach 60 years or above, and the service life of the bridge support is greatly prolonged.

Description

Technical Field

[0001] This invention relates to the field of bridge bearing technology, and in particular to a rubber composite material, its preparation method, and its application. Background Technology

[0002] Currently, the commonly used rubber materials for bridge bearings are mainly natural rubber and neoprene rubber, which are formed by laminating and vulcanizing steel plates with the rubber. These bearings are prone to problems such as rubber layer cracking and aging hardening under ultraviolet radiation, temperature fluctuations (-20℃~60℃), and humid environments, leading to a decrease in the bearing's cushioning performance, mainly manifested as: 1. Insufficient weather resistance: Under ultraviolet radiation, the molecular chains of conventional rubber break down, and the hardness increases by 10-15 Shore A per year, losing its shock absorption function after 5 years. 2. Poor mechanical stability: The rate of change of elastic modulus under temperature fluctuations is >30%, and significant hardening occurs below -10℃, resulting in uneven deformation of the support; 3. Weak ozone resistance: Ozone (concentration 20~40pphm) in vehicle exhaust around bridges accelerates rubber cracking, and traditional formulas cannot guarantee no cracking at this concentration. For example, after 5 years of outdoor service, the tensile strength retention rate of traditional plate rubber bearings is usually <60%, and the crack depth can reach more than 0.5mm after ozone exposure (concentration 50pphm), which cannot meet the requirements for long-term service. Summary of the Invention

[0003] The purpose of this invention is to provide a rubber composite material, its preparation method and application. Through the synergistic design of matrix resin and functional additives, a high-durability rubber composite material suitable for bridge bearings is prepared, solving the performance degradation problem of existing bridge bearings under extreme environments and achieving maintenance-free service for more than 60 years.

[0004] To achieve the above-mentioned objectives, the present invention provides the following technical solution: This invention provides a rubber composite material comprising the following raw materials in parts by weight: 100 parts of matrix resin, 35-45 parts of hydroxyl-modified fumed silica, 8-12 parts of plasticizer, 3-5 parts of nano zinc oxide, 3-5 parts of composite anti-aging agent, 3-4 parts of colorant, 2.0-2.8 parts of crosslinking agent, 1-2 parts of coupling agent, and 0.05-0.1 parts of platinum complex catalyst; The hydroxyl content of the hydroxyl-modified fumed silica is 1.8~2.2 mmol / g; The particle size of the nano zinc oxide is 50~100nm; The composite anti-aging agent includes hindered amine stabilizers and organotin antioxidants.

[0005] Preferably, the matrix resin includes vinyl-terminated polydimethylsiloxane, polymethylsiloxane, polymethylphenylsiloxane, or polymethylhydrosiloxane; The vinyl-terminated polydimethylsiloxane has a viscosity of 10000 mPa·s and a vinyl content of 0.15 mol.

[0006] Preferably, the preparation process of the hydroxyl-modified fumed silica includes the following steps: mixing fumed silica with water, mixing the resulting fumed silica suspension with hydrochloric acid with a mass concentration of 1%, stirring at 55~65℃ for 4 hours, and then centrifuging and drying to obtain hydroxyl-modified fumed silica.

[0007] Preferably, the plasticizer comprises methylphenyl silicone oil or dimethyl silicone oil; The methylphenyl silicone oil has a phenyl content of 15% and a viscosity of 100 mPa·s.

[0008] Preferably, the mass ratio of the hindered amine stabilizer to the organotin antioxidant is 2~3:1~2; The hindered amine stabilizer is HALS-770, and the organotin antioxidant is antioxidant 1076.

[0009] Preferably, the colorant comprises N330 carbon black; The crosslinking agent includes hydrogen-containing silicone oil or methyltrimethoxysilane; the hydrogen-containing silicone oil has a hydrogen content of 1.6 wt% and is vinyl-terminated; The coupling agent includes vinyltrimethoxysilane or vinyltriethoxysilane; The platinum complex catalyst includes chloroplatinic acid, and the platinum content in the platinum complex catalyst is 200 ppm.

[0010] The present invention also provides a method for preparing the above-mentioned rubber composite material, comprising the following preparation steps: The matrix resin, hydroxyl-modified fumed silica, colorant and coupling agent are mixed and subjected to a first compounding process to obtain the first compounded product. The first compound product, plasticizer, nano zinc oxide and composite anti-aging agent are mixed and then mixed again to obtain the second compound product. The second compound product, crosslinking agent and platinum complex catalyst are mixed and then subjected to a third compounding to obtain the third compound product. The third compound product is vulcanized and molded to obtain a support blank; The support blank is post-vulcanized to obtain a rubber composite material.

[0011] Preferably, the temperature of the first mixing step is ≤60℃, the time is 12~16min, and the rotation speed is 26~30r / min; The second mixing temperature is 75~85℃, and the time is 8~12min; The temperature of the third mixing step is <100℃, and the time is 3~4 minutes.

[0012] Preferably, the vulcanization molding temperature is 158~162℃, the pressure is 10~12MPa, and the time is 45min; The post-vulcanization is carried out in an air atmosphere, and the temperature of the post-vulcanization is 170~200℃, and the time is 4~6h.

[0013] The present invention also provides the application of the above-mentioned rubber composite material or the rubber composite material prepared by the above-mentioned preparation method in bridge bearings.

[0014] The beneficial effects of this invention are: This invention establishes a gradient reinforcement system of hydroxyl-modified silica and nano-zinc oxide in the raw materials. When the hydroxyl content of silica is moderate, the physical properties of the rubber are improved. The smaller the particle size of zinc oxide, the better the anti-aging efficiency and dispersibility, which can help improve mechanical properties. By controlling the hydroxyl content of silica and the particle size of zinc oxide, the hydroxyl content of silica can reduce the surface polarity. Small-diameter zinc oxide forms hydrogen bonds with the hydroxyl groups on the surface of silica, promoting the uniform dispersion of both in the matrix, achieving the effect of increasing interface and complementary anti-aging, and realizing the synergistic improvement of mechanical properties and weather resistance. At the same time, the molar ratio of crosslinking agent to coupling agent is controlled at 1.3-1.5:1~1.2 to ensure the uniformity of the crosslinking network and avoid stress concentration when the support deforms.

[0015] The rubber composite material obtained by this invention not only achieves a breakthrough in weather resistance, showing no cracking after ozone exposure and retaining 60% better performance after UV aging, meeting the requirements of harsh environments such as marine climates and high-altitude areas with strong UV radiation, but also exhibits wide temperature adaptability, with an elastic modulus change rate of <15% within the range of -40℃ to 80℃, solving the problem of low-temperature hardening of traditional rubber and making it suitable for regions with large temperature differences. Furthermore, the tensile strength of the rubber composite material obtained by this invention is increased by 20%, compression set is reduced by 52%, and the fatigue life reaches 10 years under bridge dynamic loads (frequency 0.5Hz). 7 The second cycle showed no damage, and the mechanical properties were significantly improved. According to the calculation through accelerated aging test, the bridge bearing made of the rubber composite material obtained by this invention can have a service life of more than 60 years, which is 2.5 times that of traditional chloroprene rubber bearings, and the maintenance cost is reduced by 70%, which greatly extends the service life of bridge bearings. Detailed Implementation

[0016] This invention provides a rubber composite material comprising the following raw materials in parts by weight: 100 parts of matrix resin, 35-45 parts of hydroxyl-modified fumed silica, 8-12 parts of plasticizer, 3-5 parts of nano zinc oxide, 3-5 parts of composite anti-aging agent, 3-4 parts of colorant, 2-2.8 parts of crosslinking agent, 1-2 parts of coupling agent, and 0.05-0.1 parts of platinum complex catalyst; The hydroxyl content of the hydroxyl-modified fumed silica is 1.8~2.2 mmol / g; The particle size of the nano zinc oxide is 50~100nm; The composite anti-aging agent includes hindered amine stabilizers and organotin antioxidants.

[0017] In this invention, unless otherwise specified, all raw materials required for preparation are commercially available products well known to those skilled in the art.

[0018] In the rubber composite material provided by the present invention, the matrix resin is preferably 100 parts by mass; the matrix resin preferably includes vinyl-terminated polydimethylsiloxane, polymethylsiloxane, polymethylphenylsiloxane or polymethylhydrosiloxane, and is more preferably vinyl-terminated polydimethylsiloxane.

[0019] In this invention, the viscosity of the vinyl-terminated polydimethylsiloxane is preferably 10000 mPa·s, and the vinyl content is preferably 0.15 mol%; this invention does not impose any special limitation on the source of the matrix resin, and the vinyl-terminated polydimethylsiloxane in the embodiments is sourced from Shenzhen Jipeng Silicon Fluorine Materials Co., Ltd.

[0020] In the rubber composite material provided by the present invention, the mass fraction of the hydroxyl-modified fumed silica is preferably 35-45 parts, more preferably 38-40 parts; the preparation method of the hydroxyl-modified fumed silica preferably includes the following steps: dispersing fumed silica in water and stirring to obtain a fumed silica suspension; adding 1% hydrochloric acid to the fumed silica suspension, stirring at 55-65°C for 4 hours, and then centrifuging and drying to obtain hydroxyl-modified fumed silica.

[0021] In this invention, the hydroxyl content of the hydroxyl-modified fumed silica is preferably 1.8~2.2 mmol / g, more preferably 2 mmol / g; the specific surface area of ​​the hydroxyl-modified fumed silica is preferably 250 m² / g. 2 / g; This invention does not impose any special restrictions on the source of the fumed silica used. In the examples, the fumed silica used was sourced from Inner Mongolia Hengxing Chemical Co., Ltd.

[0022] In the rubber composite material provided by the present invention, the plasticizer is preferably 8 to 12 parts by mass, more preferably 8 to 10 parts by mass; the plasticizer preferably includes methylphenyl silicone oil or dimethyl silicone oil, more preferably methylphenyl silicone oil; the present invention does not specifically limit the source of methylphenyl silicone oil, and the methylphenyl silicone oil in the embodiments is from Shandong Xiya Chemical Co., Ltd.

[0023] In this invention, the phenyl content of the methylphenyl silicone oil is preferably 15%, and the viscosity is preferably 100 mPa·s.

[0024] In the rubber composite material provided by the present invention, the mass fraction of the nano zinc oxide is preferably 3 to 5 parts, more preferably 3.5 to 4 parts; the present invention does not specifically limit the source of the nano zinc oxide, and the nano zinc oxide used in the examples is from Hebei Wanqiao Chemical Technology Co., Ltd.

[0025] In this invention, the particle size of the nano zinc oxide is preferably 50~100nm, and more preferably 80nm.

[0026] In the rubber composite material provided by the present invention, the composite anti-aging agent preferably comprises 3 to 5 parts by mass, more preferably 3 to 4 parts by mass, and the composite anti-aging agent preferably includes a hindered amine stabilizer and an organotin antioxidant. The mass ratio of the hindered amine stabilizer to the organotin antioxidant is preferably 2 to 3: 1 to 2, more preferably 2 to 2.5: 1 to 1.5.

[0027] In this invention, the hindered amine stabilizer is preferably HALS-770, and the organotin antioxidant is preferably antioxidant 1076. This invention does not impose any special limitation on the source of the hindered amine stabilizer HALS-770 and the organotin antioxidant 1076. The hindered amine stabilizer HALS-770 and the organotin antioxidant 1076 used in the examples are both from Tianjin Lianlong New Materials Co., Ltd.

[0028] In the rubber composite material provided by the present invention, the colorant is preferably 3 to 4 parts by mass, more preferably 3 parts; the colorant preferably includes N330 carbon black; the present invention does not specifically limit the source of the colorant, and the N330 carbon black used in the embodiments is from Longxing Technology Co., Ltd.

[0029] In the rubber composite material provided by the present invention, the mass fraction of the crosslinking agent is preferably 2 to 2.8 parts, more preferably 2.2 to 2.5 parts; the crosslinking agent preferably includes hydrogen-containing silicone oil or methyltrimethoxysilane, more preferably hydrogen-containing silicone oil; the present invention does not specifically limit the source of the crosslinking agent, and the hydrogen-containing silicone oil used in the examples is from Shandong Chenqian Nanotechnology Co., Ltd.

[0030] In this invention, the hydrogen content of the hydrogen-containing silicone oil is preferably 1.6 wt%, and it is vinyl-terminated.

[0031] In the rubber composite material provided by the present invention, the coupling agent is preferably 1 to 2 parts by mass, more preferably 1.2 to 1.5 parts by mass; the coupling agent preferably includes vinyltrimethoxysilane or vinyltriethoxysilane, more preferably vinyltrimethoxysilane; the present invention does not specifically limit the source of the coupling agent, and the vinyltrimethoxysilane used in the examples is from Shandong Bosheng Chemical Co., Ltd.

[0032] In the rubber composite material provided by the present invention, the mass fraction of the platinum complex catalyst is preferably 0.05~0.1 parts, more preferably 0.06~0.08 parts; the present invention does not specifically limit the source of the platinum complex catalyst, and the platinum complex catalyst used in the examples comes from Lanzhou Petrochemical Company Catalyst Plant.

[0033] In this invention, the platinum complex catalyst preferably comprises chloroplatinic acid; the platinum content in the platinum complex catalyst is preferably 200 ppm.

[0034] The present invention also provides a method for preparing the above-mentioned rubber composite material, comprising the following preparation steps: The matrix resin, hydroxyl-modified fumed silica, colorant and coupling agent are mixed and subjected to a first compounding process to obtain the first compounded product. The first compound product, plasticizer, nano zinc oxide and composite anti-aging agent are mixed and then mixed again to obtain the second compound product. The second compound product, crosslinking agent and platinum complex catalyst are mixed and then subjected to a third compounding to obtain the third compound product. The third compound product is vulcanized and molded to obtain a support blank; The support blank is post-vulcanized to obtain a rubber composite material. The present invention adopts a two-stage temperature-controlled vulcanization process (molding + post-vulcanization), which eliminates the internal stress at the interface between the rubber compound and the steel plate by step-by-step temperature increase and improves the interlayer adhesion strength. The anti-aging agent is added in stages in the second stage of mixing using gradient addition technology to ensure that the hindered amine stabilizer HALS-770 and hindered amine stabilizer 1076 form a nanoscale dispersion network in the matrix resin.

[0035] In this invention, the hydroxyl-modified fumed silica and the matrix resin are preferably pretreated separately. Specifically, the fumed silica is vacuum dried at 150°C for 6 hours, and the matrix resin is dehydrated under reduced pressure at 80°C for 4 hours. The purpose of pretreating the hydroxyl-modified fumed silica and the matrix resin is to remove impurities and avoid their influence on the experiment.

[0036] Preferably, after pretreatment, the matrix resin, hydroxyl-modified fumed silica, colorant and coupling agent are mixed and then first mixed in a two-roll mill to obtain a first mixed product.

[0037] In this invention, the temperature of the first mixing is preferably ≤60℃, more preferably 60℃, the time is preferably 12~16min, more preferably 15min, and the rotation speed is preferably 26~30r / min, more preferably 28r / min.

[0038] Preferably, the present invention continues to add plasticizer, nano zinc oxide and composite anti-aging agent to the open mill, so that the above-mentioned first compound product, plasticizer, nano zinc oxide and composite anti-aging agent are mixed and a second compounding is carried out to obtain the second compound product.

[0039] In this invention, the temperature of the second mixing is preferably 75~85℃, more preferably 80℃, and the time is preferably 8~12min, more preferably 10min.

[0040] In this invention, it is preferable to continue adding a crosslinking agent and a platinum complex catalyst to the open mill, so that the above-mentioned second compound product, crosslinking agent and platinum complex catalyst are mixed, and a third compounding is carried out to obtain a third compound product.

[0041] In this invention, the temperature of the third mixing is preferably <100°C, more preferably <95°C, and the time is preferably 1~4 min, more preferably 1~3 min.

[0042] The present invention preferably involves vulcanizing the third compound product to obtain a support blank, and then performing post-vulcanization in an air atmosphere to eliminate internal stress, thereby obtaining a rubber composite material.

[0043] In this invention, the vulcanization temperature is preferably 158~162℃, more preferably 160℃, the pressure is preferably 10~12MPa, more preferably 12MPa, and the time is preferably 45min; the post-vulcanization temperature is preferably 170~200℃, more preferably 200℃, and the time is preferably 4~6h, more preferably 6h.

[0044] The present invention also provides the application of the above-mentioned rubber composite material or the rubber composite material prepared by the above-mentioned preparation method in bridge bearings.

[0045] The technical solutions provided by the present invention will be described in detail below with reference to the embodiments, but they should not be construed as limiting the scope of protection of the present invention.

[0046] The vinyl-terminated polydimethylsiloxane used in Examples 1-3 and Comparative Example 1 was sourced from Shenzhen Jipeng Silicon Fluorine Materials Co., Ltd. The fumed silica is sourced from Inner Mongolia Hengxing Chemical Co., Ltd., and its product model number is 005. The hydrogen-containing silicone oil is sourced from Shandong Chenqian Nanotechnology Co., Ltd. The platinum complex catalyst was sourced from the catalyst plant of Lanzhou Petrochemical Company. The methylphenyl silicone oil is sourced from Shandong Xiya Chemical Co., Ltd. The nano zinc oxide comes from Hebei Wanqiao Chemical Technology Co., Ltd., and has a particle size of 30nm. HALS-770 is sourced from Tianjin Lianlong New Materials Co., Ltd. 1076 originates from Tianjin Lianlong New Materials Co., Ltd. Vinyltrimethoxysilane is sourced from Shandong Bosheng Chemical Co., Ltd. N330 carbon black is sourced from Longxing Technology Co., Ltd.

[0047] Example 1

[0048] In this embodiment, the rubber composite material comprises the following parts by weight of raw materials: Vinyl-terminated polydimethylsiloxane 100 parts, hydroxyl-modified fumed silica 40 parts, methylphenyl silicone oil 10 parts, nano zinc oxide 4 parts, HALS-770 2.5 parts, 1076 1.5 parts, N330 carbon black 3 parts, hydrogen-containing silicone oil 2.5 parts, vinyltrimethoxysilane 1.5 parts (1.3:1), chloroplatinic acid 0.08 parts; The preparation method includes the following steps: Hydroxyl-modified fumed silica was vacuum dried at 150°C for 6 hours to obtain pretreated fumed silica. Vinyl-terminated polydimethylsiloxane was dehydrated under reduced pressure at 80°C for 4 hours to obtain pretreated vinyl-terminated polydimethylsiloxane. Pretreated vinyl-terminated polydimethylsiloxane, hydroxyl-modified fumed silica, N330 carbon black and vinyltrimethoxysilane were mixed and firstly mixed in a two-roll mill at 60°C and 28 r / min for 15 min to obtain the first mixed product. Continue adding methylphenyl silicone oil, nano zinc oxide, HALS-770 and 1076 to the open mill, raise the temperature to 80°C, and carry out the second mixing for 10 minutes to obtain the second mixed product. Continue to add hydrogen-containing silicone oil and chloroplatinic acid to the open mill to mix the above second compound product, hydrogen-containing silicone oil and chloroplatinic acid, and carry out a third compounding at 95°C for 1 minute to obtain the third compound product. The third compound product was vulcanized and molded at 160°C and 12MPa for 45 minutes to form a support blank. Then, it was post-vulcanized at 200°C in air for 6 hours to obtain a rubber composite material.

[0049] Example 2

[0050] The only difference from Example 1 is: In this embodiment, the rubber composite material comprises the following parts by weight of raw materials: 100 parts of vinyl-terminated polydimethylsiloxane, 38 parts of hydroxyl-modified fumed silica, 8 parts of methylphenyl silicone oil, 3.5 parts of nano zinc oxide, 2 parts of HALS-770, 1 part of 1076, 3 parts of N330 carbon black, 2.2 parts of hydrogen-containing silicone oil, 1.2 parts of vinyltrimethoxysilane, and 0.06 parts of platinum catalyst.

[0051] Comparative Example 1

[0052] The only difference from Example 1 is: The rubber composite material in this comparative example includes the following parts by mass of raw materials: 100 parts of chloroprene rubber, 5 parts of nano zinc oxide, 2 parts of stearic acid, 2.2 parts of antioxidant 4010Na, 2 parts of antioxidant RD, 4 parts of microcrystalline wax, 21 parts of N330 carbon black, 18 parts of light calcium carbonate, 4 parts of accelerator CZ, 1.3 parts of accelerator DM, and 2 parts of sulfur. The preparation method includes the following steps: The above raw materials were mixed in parts by mass and subjected to vulcanization molding in one step, wherein the molding temperature was 140℃, the pressure was 10MPa, and the time was 40min, to obtain the rubber composite material of Comparative Example 1.

[0053] Performance testing

[0054] 1. The rubber composite materials prepared in Examples 1-2 and Comparative Example 1 were tested for ozone crack resistance, heat aging, and tear strength. The ozone crack resistance was determined according to GB / T 7762-2014, the heat aging performance was determined according to GB / T 3512-2014, and the mechanical properties were determined according to GB / T528-2008. The results are recorded in Table 1.

[0055] Table 1. Performance test results of rubber composite materials in Examples 1-2 and Comparative Example 1

[0056] As shown in Table 1, compared with the rubber composite material with chloroprene rubber as the main material in Comparative Example 1, the rubber composite material prepared in Examples 1-2 of this application has much greater mechanical properties than the traditional chloroprene rubber bearing, and its weather resistance and ozone resistance are far superior to those of the traditional method.

[0057] 2. Cut the rubber composite materials obtained in Examples 1-2 and Comparative Example 1 into 400mm plates according to the JT / T4-2019 standard for rubber bearings. 600 99mm support, steel plate size is 395 595 4mm thick, 7 layers in total, with the middle single layer adhesive being 400mm thick. 600 The support consists of 5 layers, each 11mm thick, with top and bottom 2.5mm thick rubber layers, stacked and vulcanized. Pre-vulcanization is performed at 140℃, and the vulcanization time is 1.8 times the height of the support under rated pressure. After vulcanization, a post-vulcanization stage is carried out by placing the support in a constant temperature chamber at 220℃ for 4 hours to complete the vulcanization process.

[0058] The bridge bearings obtained above were subjected to aging shear tests: the finished products were placed in an aging chamber and removed after 168 hours at 70℃±2. After being placed in an environment of 23℃ for 48 hours, the shear modulus was tested (the test method was carried out according to Appendix D3.2 of GB / T20688.4-2023). The results are shown in Table 2. Table 2. Aging shear test results of supports made from the materials of Examples 1-2 and Comparative Example 1

[0059] As shown in Table 2, comparing the shear test results of the rubber bearings prepared by Examples 1-2 and Comparative Example 1, it can be found that the change value of the rubber bearing made of the high-durability rubber composite material prepared in this invention is about 3 times that of the traditional rubber bearing.

[0060] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A rubber composite material, characterized in that, The raw materials include the following parts by weight: 100 parts of matrix resin, 35-45 parts of hydroxyl-modified fumed silica, 8-12 parts of plasticizer, 3-5 parts of nano zinc oxide, 3-5 parts of composite anti-aging agent, 3-4 parts of colorant, 2-2.8 parts of crosslinking agent, 1-2 parts of coupling agent, and 0.05-0.1 parts of platinum complex catalyst; The hydroxyl content of the hydroxyl-modified fumed silica is 1.8~2.2 mmol / g; The particle size of the nano zinc oxide is 50~100nm; The composite anti-aging agent includes hindered amine stabilizers and organotin antioxidants.

2. The rubber composite material according to claim 1, characterized in that, The matrix resin includes vinyl-terminated polydimethylsiloxane, polymethylsiloxane, polymethylphenylsiloxane, or polymethylhydrosiloxane. The vinyl-terminated polydimethylsiloxane has a viscosity of 10000 mPa·s and a vinyl content of 0.15 mol.

3. The rubber composite material according to claim 1, characterized in that, The preparation process of the hydroxyl-modified fumed silica includes the following steps: mixing fumed silica with water, mixing the resulting fumed silica suspension with hydrochloric acid with a mass concentration of 1%, stirring at 55~65℃ for 4 hours, and then centrifuging and drying to obtain hydroxyl-modified fumed silica.

4. The rubber composite material according to claim 1, characterized in that, The plasticizer includes methylphenyl silicone oil or dimethyl silicone oil; The methylphenyl silicone oil has a phenyl content of 15% and a viscosity of 100 mPa·s.

5. The rubber composite material according to claim 1, characterized in that, The mass ratio of the hindered amine stabilizer to the organotin antioxidant is 2~3:1~2; The hindered amine stabilizer is HALS-770, and the organotin antioxidant is antioxidant 1076.

6. The rubber composite material according to claim 1, characterized in that, The colorant includes N330 carbon black; The crosslinking agent includes hydrogen-containing silicone oil or methyltrimethoxysilane; the hydrogen-containing silicone oil has a hydrogen content of 1.6 wt% and is vinyl-terminated; The coupling agent includes vinyltrimethoxysilane or vinyltriethoxysilane; The platinum complex catalyst includes chloroplatinic acid, and the platinum content in the platinum complex catalyst is 200 ppm.

7. The method for preparing the rubber composite material according to any one of claims 1 to 6, characterized in that, The preparation steps include the following: The matrix resin, hydroxyl-modified fumed silica, colorant and coupling agent are mixed and subjected to a first compounding process to obtain the first compounded product. The first compound product, plasticizer, nano zinc oxide and composite anti-aging agent are mixed and then mixed again to obtain the second compound product. The second compound product, crosslinking agent and platinum complex catalyst are mixed and then subjected to a third compounding to obtain the third compound product. The third compound product is vulcanized and molded to obtain a support blank; The support blank is post-vulcanized to obtain a rubber composite material.

8. The preparation method according to claim 7, characterized in that, The temperature of the first mixing process is ≤60℃, the time is 12~16min, and the rotation speed is 26~30r / min; The second mixing temperature is 75~85℃, and the time is 8~12min; The temperature of the third mixing step is <100℃, and the time is 3~4 minutes.

9. The preparation method according to claim 7, characterized in that, The vulcanization molding temperature is 158~162℃, the pressure is 10~12MPa, and the time is 45min; The post-vulcanization is carried out in an air atmosphere, and the temperature of the post-vulcanization is 170~200℃, and the time is 4~6h.

10. The application of the rubber composite material according to any one of claims 1 to 6 or the rubber composite material prepared by the preparation method according to any one of claims 7 to 9 in bridge bearings.

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