Anti-aging rubber runway and production process thereof

Abstract

The invention discloses an anti-aging rubber runway and a production process thereof, and relates to the technical field of rubber runways. The anti-aging rubber runway is prepared from the following raw materials in parts by weight: 400 to 600 parts of modified rubber, 200 to 300 parts of modified polyurethane elastomer, 100 to 200 parts of environment-friendly hydrophobic filler, 30 to 50 parts of antioxidant, 20 to 40 parts of plasticizer, 10 to 20 parts of cross-linking agent, 10 to 20 parts of activated zinc oxide, 5 to 15 parts of nano titanium dioxide, 2 to 8 parts of graphene, 1 to 5 parts of antibacterial agent and 10 to 30 parts of hollow glass beads. The anti-aging rubber runway disclosed by the invention shows excellent performance through a unique raw material formula and process. The modified rubber and the polyurethane elastomer synergistically improve aging resistance and wear resistance; the environment-friendly hydrophobic filler enhances hydrophobic and environment-friendly characteristics; the ultraviolet resistance is enhanced by nano titanium dioxide and graphene; the antibacterial agent inhibits the growth of bacteria; the hollow glass beads reduce the density and improve the elasticity and impact resistance. The whole fabric has excellent weather resistance, wear resistance, antibacterial performance and environmental protection performance, and is suitable for various outdoor sports fields.

Description

Technical Field

[0001] The invention relates to the technical field of runway materials, in particular to an aging-resistant rubber runway and a production process thereof. Background Art

[0002] In the current booming modern sports industry, rubber tracks, as a key sports venue facility, are widely used in various sports venues such as schools, gymnasiums, and athletic fields. It not only provides athletes with a comfortable sports experience, but also effectively reduces sports injuries, so it is very popular. However, the existing rubber tracks have exposed many problems in actual use, which seriously restricts their further development and application.

[0003] First of all, poor aging resistance is a prominent problem. The rubber track is exposed to the natural environment for a long time, and factors such as ultraviolet rays, oxygen, and temperature changes will affect it. After a long period of light exposure, the track is easy to fade, and the surface material gradually ages and becomes brittle, and then cracks and peeling appear. This not only affects the aesthetics of the track, but also greatly reduces its service life and increases maintenance costs. Secondly, insufficient hydrophobicity is also a major problem. On rainy days or in humid environments, water easily accumulates on the surface of traditional rubber tracks. Not only does the accumulated water make the surface of the track slippery, increasing the risk of athletes slipping and getting injured, but the accumulated water will also penetrate into the track for a long time, accelerating the damage of the track material and shortening the overall service life of the track. In addition, the traditional rubber track also has defects in antibacterial properties. Because the track is often in a humid and warm environment, it is very suitable for the growth of bacteria and mold. The reproduction of these microorganisms not only produces odors, affects the hygiene of the sports environment, but also may pose a potential threat to the health of users.

[0004] As people's requirements for the quality and safety of sports venues continue to increase, the existing rubber track can no longer meet the demand. Developing a new type of rubber track with excellent aging resistance, good hydrophobicity and high-efficiency antibacterial properties and its production process has become an important issue that needs to be solved in the current sports facilities field. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides an aging-resistant rubber runway and a production process thereof, which solve the problems of poor aging resistance and weak hydrophobicity of the above-mentioned rubber runway.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: An aging-resistant rubber track comprises the following raw materials in parts by weight: 400-600 parts of modified rubber, 200-300 parts of modified polyurethane elastomer, 100-200 parts of environmentally friendly hydrophobic filler, 30-50 parts of antioxidant, 20-40 parts of plasticizer, 10-20 parts of cross-linking agent, 10-20 parts of active zinc oxide, 5-15 parts of nano titanium dioxide, 2-8 parts of graphene, 1-5 parts of antibacterial agent and 10-30 parts of hollow glass microspheres.

[0007] Furthermore, the modified rubber is prepared by the following steps: A1. Add butyl rubber into an internal mixer, heat to 110°C, stir at 100r / min, then slowly add nano-silica and silane coupling agent KH550 in sequence, and continue mixing for 35 minutes to obtain pretreated rubber; the dosage ratio of butyl rubber, nano-silica and silane coupling agent KH550 is 500g:50g:31.71mL; A2. The pretreated rubber was transferred to an open mill, the roller temperature was cooled to 80°C, the rubber was placed between the rollers of the open mill, and the rubber was repeatedly squeezed and sheared by the rollers. While the rubber passed through the rollers, the hindered amine light stabilizer GW-540 and the ultraviolet absorber UV-531 were evenly added, and the mixing was continued for 20 minutes to obtain a secondary modified rubber; the amount ratio of the pretreated rubber, the hindered amine light stabilizer GW-540, and the ultraviolet absorber UV-531 was 450g:20g:15g; A3. Put the rubber after secondary modification into a reactor, introduce ozone, and react for 2 hours at a temperature of 45°C and an ozone concentration of 6 mg / L. After the reaction is completed, purge with nitrogen for 20 minutes to remove excess ozone to obtain modified rubber.

[0008] In step A1, when the silane coupling agent contacts nano-silica, the silanol group in the molecule reacts with the hydroxyl group to undergo hydrolysis, and the Si-O bond in the silanol group breaks to form a silanol group, which can react with the hydroxyl group on the surface of the nano-silica to form a stable Si-O-Si bond, thereby firmly connecting the silane coupling agent to the surface of the nano-silica. This process not only consumes part of the hydroxyl group on the surface of the nano-silica, reduces the tendency of agglomeration between the nano-silica particles due to the interaction of hydroxyl groups, but also introduces a reactive organic group on the surface of the nano-silica. At the same time, the organic group at the other end of the silane coupling agent molecule reacts chemically with the active group on the rubber molecular chain, such as an unsaturated double bond, to form a chemical bond connection, which can greatly enhance the interfacial bonding force between the two, so that the nano-silica can be evenly dispersed in the rubber matrix to avoid the occurrence of agglomeration. When the rubber is subjected to external force, the nano-silica can effectively transmit stress, reduce the stress concentration inside the rubber, thereby effectively improving the wear resistance of the rubber. In step A2, when ultraviolet rays irradiate the rubber material, the chemical bonds in the ultraviolet absorber molecules absorb the energy of ultraviolet photons, and the electrons transition from the ground state to the excited state. In the excited state, the molecules release the absorbed ultraviolet energy in harmless forms such as heat energy through the internal energy conversion process, thereby avoiding the direct effect of ultraviolet energy on the rubber molecular chain and inhibiting the photooxidative degradation reaction of the rubber molecules. Specific structures such as hindered amine structures in the light stabilizer molecules can react with free radicals generated by chemical bonds broken by ultraviolet rays in rubber molecules, converting free radicals into relatively stable compounds, interrupting the chain reaction, thereby effectively delaying the aging process of rubber and improving the aging resistance and weather resistance of rubber. In step A3, ozone reacts with unsaturated double bonds in the rubber molecular chain. The π electron cloud of the ozone molecule interacts with the π electron cloud in the rubber molecular chain, resulting in an oxygen atom of the ozone molecule and a carbon atom in the rubber molecular chain forming an unstable ozonide intermediate. This ozone intermediate rapidly decomposes, breaking the C=C double bond in the rubber molecular chain to form polar groups such as C=O and -COOH, which can change the chemical properties of the rubber molecule and change its affinity for certain chemicals, thereby improving the chemical corrosion resistance of the rubber. In addition, the presence of ozone will also trigger a cross-linking reaction between rubber molecular chains. The free radicals generated by the action of ozone on the rubber molecular chain can react with the active sites on the adjacent rubber molecular chains to form intermolecular chemical bonds, so that the rubber molecular chains are interconnected to form a three-dimensional network structure, which restricts the relative movement of the rubber molecular chains, increases the strength and hardness of the rubber material, and further enhances the wear resistance of the rubber.

[0009] Furthermore, the modified polyurethane elastomer is prepared by the following steps: B1. Pre-fill the reactor with nitrogen for 10 minutes to remove air and moisture, then add polyoxypropylene glycol and toluene diisocyanate into the reactor, slowly heat up to 85°C, stir at 200-300r / min for 2 hours to generate a prepolymer, then add nano-calcium carbonate, continue stirring for 2 hours, and the whole process is carried out under nitrogen protection to obtain intermediate 1; the amount ratio of polyoxypropylene glycol, toluene diisocyanate, and nano-calcium carbonate is 198.02mL:81.97mL:30g; Polyoxypropylene glycol and toluene diisocyanate react. During this process, the OH bond in the hydroxyl group breaks, the hydrogen atom combines with the nitrogen atom in the isocyanate group, and the oxygen atom connects with the carbon atom to form a carbamate bond, thus realizing the connection between polyoxypropylene glycol and toluene diisocyanate to form a prepolymer. The active sites on the surface of nano-calcium carbonate can interact with the polar groups on the prepolymer molecular chain, such as the carbonyl group in the carbamate bond, through physical adsorption or weak chemical action, to form a physical cross-linking point between the polyurethane molecular chains; on the other hand, the nano-calcium carbonate particles themselves have high hardness and rigidity, and play a reinforcing and supporting role between the polyurethane molecular chains. When the polyurethane elastomer is stretched by external force, the nano-calcium carbonate can effectively transmit stress and prevent relative sliding between the molecular chains, thereby improving the hardness and tensile strength of the polyurethane elastomer.

[0010] B2, cool the intermediate 1 to 60°C, slowly add ethylenediamine chain extender, then add silicone rubber powder, and react for 2 hours to obtain intermediate 2; the usage ratio of intermediate 1, ethylenediamine chain extender, and silicone rubber powder is 200g:16.67mL:20g; The ethylenediamine chain extender reacts with the isocyanate group in the prepolymer, the N=C double bond in the isocyanate group is polarized, the NH bond in the primary amine group is broken, the hydrogen atom combines with the nitrogen atom in the isocyanate group, and the nitrogen atom is connected to the carbon atom to form a urea bond, connecting the ethylenediamine to the prepolymer molecular chain, so that the polyurethane molecular chain can grow. As the reaction proceeds, more ethylenediamine molecules react with the prepolymer molecular chain to form a longer and more complex molecular chain structure, which not only increases the degree of mutual entanglement between the molecular chains, but also provides a more favorable molecular basis for the subsequent synergistic effect of silicone rubber powder. When silicone rubber powder is dispersed in the polyurethane system after chain extension, there is physical entanglement and intermolecular force between the silicone rubber powder molecular chain and the polyurethane molecular chain. This interaction enables the silicone rubber powder to play a dual role in the polyurethane elastomer similar to that of a plasticizer and a reinforcing agent.

[0011] B3. Place the intermediate 2 into a mold and perform hot pressing vulcanization treatment at a temperature of 110° C. and a pressure of 8 MPB for 40 minutes to obtain a modified polyurethane elastomer.

[0012] During the hot-press vulcanization process, under hot-pressing conditions, the isocyanate groups on the molecular chain react with the amino or hydroxyl groups on the adjacent molecular chains to form new chemical bonds, connecting different molecular chains. This cross-linking reaction continues, causing the polyurethane molecular chains to gradually form a complex three-dimensional network structure, improving its hardness, elasticity and anti-slip properties.

[0013] Furthermore, the environmentally friendly hydrophobic material is prepared by the following steps: 150 parts of diatomaceous earth, 10 parts of stearic acid, and 5 parts of polytetrafluoroethylene emulsion were weighed by weight, and stirred in a reactor at 80° C. for 2 hours to obtain an environmentally friendly hydrophobic filler.

[0014] During the reaction, stearic acid and polytetrafluoroethylene emulsion will form a hydrophobic layer on the surface of diatomite, making the filler hydrophobic. At the same time, the porous structure and large specific surface area of ​​diatomite help to absorb harmful substances in the rubber track and achieve environmental protection.

[0015] Furthermore, the antioxidant is one of antioxidant 1010 and antioxidant 300.

[0016] Furthermore, the plasticizer is one of dioctyl phthalate, epoxy soybean oil, and tributyl citrate.

[0017] Furthermore, the cross-linking agent is one of dicumyl peroxide, sulfur, and triallyl isocyanurate.

[0018] Furthermore, the antibacterial agent is one of nano zinc oxide, silver ion antibacterial agent, and didecyl dimethyl ammonium chloride.

[0019] A method for preparing an aging-resistant rubber runway comprises the following steps: Weigh each raw material by weight. First, add the modified rubber and modified polyurethane elastomer into an internal mixer, heat it to 120-130℃, and stir at 100-150r / min to mix evenly. Then add active zinc oxide, nano titanium dioxide, graphene, antibacterial agent and hollow glass microspheres in turn, stir evenly, then add environmentally friendly hydrophobic filler, antioxidant, plasticizer and cross-linking agent and mix thoroughly. Then transfer the materials to an open mixer for thin-pass mixing 5-8 times, put the mixed rubber into a mold, increase the temperature to 150-160℃, set the pressure to 8-15MPB for hot pressing, and keep it for 40 minutes. After the hot pressing is completed, slowly reduce the pressure and temperature, and after the mold cools to room temperature, take out the rubber material, control the ambient temperature at 20-30℃, and the relative humidity at 40-60% for curing for 7-10 days to finally obtain an aging-resistant rubber runway material.

[0020] Beneficial effects of the present invention: 1. In terms of aging resistance, the preparation process of modified rubber plays a key role. By adding nano-silica and silane coupling agent KH550 in the internal mixer, the wear resistance of the rubber is enhanced; the addition of hindered amine light stabilizer GW-540 and ultraviolet absorber UV-531 effectively inhibits the photo-oxidative degradation reaction of rubber molecules and improves aging resistance and weather resistance; ozone treatment introduces polar groups, improves chemical corrosion resistance and wear resistance. At the same time, the introduction of nano-titanium dioxide and graphene further enhances the anti-ultraviolet and anti-aging capabilities of the runway. These ingredients work together to greatly extend the service life of the rubber runway, reduce frequent replacement due to aging, and reduce maintenance costs.

[0021] 2. In terms of physical properties, the modified polyurethane elastomer has been significantly improved through multi-step reactions. Polyoxypropylene glycol and toluene diisocyanate react to form a prepolymer, and the addition of nano-calcium carbonate increases the hardness and tensile strength; ethylenediamine chain extender increases the molecular chain, silicone rubber powder increases elasticity, and the three-dimensional network structure formed by hot pressing vulcanization treatment further improves hardness, elasticity and anti-slip performance. In addition, the addition of hollow glass microspheres not only reduces the density of the material, but also improves the elasticity and impact resistance of the runway, providing users with a more comfortable and safe sports experience and reducing the risk of sports injuries.

[0022] 3. Environmentally friendly hydrophobic filler is made of diatomite, stearic acid and polytetrafluoroethylene emulsion. Stearic acid and polytetrafluoroethylene emulsion form a hydrophobic layer on the surface of diatomite, which makes the runway have good hydrophobic properties, can quickly drain water, keep the surface dry, and reduce the damage to the runway caused by water accumulation. At the same time, the porous structure and large specific surface area of ​​diatomite can absorb harmful substances in the rubber runway, realize environmental protection function, conform to the development concept of green environmental protection, and reduce pollution to the environment.

[0023] 4. In terms of antibacterial performance, the added antibacterial agents such as nano zinc oxide, silver ion antibacterial agents or didecyl dimethyl ammonium chloride effectively inhibit the growth of bacteria and mold, keep the surface of the runway clean and hygienic, and create a healthier sports environment for users. It is especially suitable for crowded sports venues and reduces the risk of pathogen transmission. DETAILED DESCRIPTION

[0024] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] Example 1, preparing modified rubber, the specific steps are as follows: A1. Add 500 g of butadiene rubber into a mixer, heat to 110° C., stir at 100 r / min, then slowly add 50 g of nano-silica and 31.71 mL of silane coupling agent KH550, and continue mixing for 35 minutes to obtain pretreated rubber; A2, take 450g of pretreated rubber and transfer it to an open mill, cool the roller temperature to 80°C, place the rubber between the rollers of the open mill, and repeatedly squeeze and shear the rubber through the rollers. While the rubber passes through the rollers, evenly add 20g of hindered amine light stabilizer GW-540 and 15g of ultraviolet absorber UV-531, and continue mixing for 20 minutes to obtain a secondary modified rubber; A3, putting the rubber after secondary modification into a reactor, introducing ozone, reacting for 2 hours at a temperature of 45°C and an ozone concentration of 6 mg / L. After the reaction, purging with nitrogen for 20 minutes to remove excess ozone, thereby obtaining a modified rubber; Example 2, preparing a modified polyurethane elastomer, the specific steps are as follows: B1. Pre-flow nitrogen into the reactor for 10 minutes to remove air and moisture, then add 198.02 mL of polyoxypropylene glycol and 81.97 mL of toluene diisocyanate into the reactor, heat to 85° C., stir at 200-300 r / min for 2 hours to generate a prepolymer, then add 30 g of nano calcium carbonate, continue stirring for 2 hours, and the whole process is carried out under nitrogen protection to obtain intermediate 1; B2, cool 200g of intermediate 1 to 60°C, slowly add 16.67mL of ethylenediamine chain extender, then add 20g of silicone rubber powder, and react for 2 hours to obtain intermediate 2; B3. Place the intermediate 2 into a mold and perform hot pressing vulcanization treatment at a temperature of 110° C. and a pressure of 8 MPa for 40 minutes to obtain a modified polyurethane elastomer.

[0026] Example 3, preparing environmentally friendly hydrophobic filler, the specific steps are as follows: 150 parts of diatomaceous earth, 10 parts of stearic acid, and 5 parts of polytetrafluoroethylene emulsion were weighed by weight, and stirred in a reactor at 80° C. for 2 hours to obtain an environmentally friendly hydrophobic filler.

[0027] Example 4, preparing an aging-resistant rubber runway, the specific steps are as follows: Weigh each raw material by weight. First, add 400 parts of the modified rubber prepared in Example 1 and 200 parts of the modified polyurethane elastomer prepared in Example 2 into an internal mixer, raise the temperature to 120°C, and stir and mix evenly at 100 r / min. Then, add 10 parts of active zinc oxide, 5 parts of nano titanium dioxide, 2 parts of graphene, 1 part of nano zinc oxide and 10 parts of hollow glass microspheres in sequence, stir evenly, and then add 100 parts of the environmentally friendly hydrophobic filler prepared in Example 3, 30 parts of antioxidant Agent 1010, 20 parts of dioctyl phthalate and 10 parts of diisopropylbenzene peroxide are fully mixed; then the materials are transferred to an open mixing mill for thin-pass mixing 5 times, the mixed rubber is put into a mold, the temperature is increased to 150°C, the pressure is set to 8MPB for hot pressing, and maintained for 40 minutes; after the hot pressing is completed, the pressure and temperature are slowly reduced, and after the mold is cooled to room temperature, the rubber material is taken out, the ambient temperature is controlled at 20°C, and the relative humidity is controlled at 40% for curing for 7 days, and finally an aging-resistant rubber runway material is obtained.

[0028] Example 5, preparing an aging-resistant rubber runway, the specific steps are as follows: Weigh each raw material by weight. First, add 600 parts of the modified rubber prepared in Example 1 and 300 parts of the modified polyurethane elastomer prepared in Example 2 into an internal mixer, raise the temperature to 130°C, and stir and mix evenly at 150r / min; then add 20 parts of active zinc oxide, 15 parts of nano titanium dioxide, 8 parts of graphene, 5 parts of silver ion antibacterial agent and 30 parts of hollow glass microspheres in sequence, stir evenly, then add 200 parts of the environmentally friendly hydrophobic filler prepared in Example 3, 50 parts of antioxidant 300, 40 parts of epoxy soybean oil and 20 parts of sulfur and mix well; then transfer the material to an open mixer for thin-pass rubber mixing 8 times, put the refined rubber into a mold, raise the temperature to 160°C, set the pressure to 15MPB for hot pressing molding, and keep it for 40 minutes; after the hot pressing is completed, slowly reduce the pressure and temperature, and after the mold is cooled to room temperature, take out the rubber material, control the ambient temperature at 30°C, and control the relative humidity at 60% for curing for 10 days, and finally obtain an aging-resistant rubber runway material.

[0029] Example 6, preparing an aging-resistant rubber runway, the specific steps are as follows: Weigh each raw material by weight. First, add 500 parts of the modified rubber prepared in Example 1 and 250 parts of the modified polyurethane elastomer prepared in Example 2 into an internal mixer, raise the temperature to 125°C, and stir and mix evenly at 125r / min. Then, add 15 parts of active zinc oxide, 10 parts of nano titanium dioxide, 5 parts of graphene, 3 parts of didecyl dimethyl ammonium chloride and 20 parts of hollow glass microspheres in sequence, stir evenly, and then add 150 parts of the environmentally friendly hydrophobic filler prepared in Example 3, 40 300 parts of antioxidant, 30 parts of tributyl citrate and 15 parts of triallyl isocyanurate are fully mixed; then the materials are transferred to an open mixing mill for thin-pass mixing 6 times, the mixed rubber is put into a mold, the temperature is increased to 155°C, the pressure is set to 11MPB for hot pressing, and maintained for 40 minutes; after the hot pressing is completed, the pressure and temperature are slowly reduced, and after the mold is cooled to room temperature, the rubber material is taken out, the ambient temperature is controlled at 25°C, and the relative humidity is controlled at 50% for curing for 8 days, and finally an aging-resistant rubber runway material is obtained.

[0030] Comparative Example 1: An aging-resistant rubber track is prepared. The specific preparation steps are as follows: The remaining steps remain unchanged, except that the modified rubber in Example 5 is replaced by rubber that has not been treated in any way, to prepare a rubber track material.

[0031] Comparative Example 2 The remaining steps remain unchanged, only the modified polyurethane elastomer in Example 5 is replaced by an untreated polyurethane elastomer to prepare a rubber track material.

[0032] Comparative Example 3 The remaining steps remain unchanged, except that the modified rubber in Example 5 is replaced by a rubber that has not been treated in any way, and the modified polyurethane elastomer is replaced by an untreated polyurethane elastomer, to prepare a rubber track material.

[0033] Performance Testing Test method: 1. Aging resistance: According to GB / T16422.2-2014 "Plastic Laboratory Light Source Exposure Test Method Part 2: Xenon Arc Lamp" standard, use a xenon arc lamp aging test chamber to conduct artificial accelerated aging tests. Put the prepared rubber runway sample into the test chamber to simulate the light, temperature, humidity and other conditions in the natural environment. Set the light intensity to 550W / m² (wavelength range 300-800nm), the blackboard temperature to 65℃, the relative humidity to 50%, the rainfall cycle to 18min / 102min (raining for 18min, no raining for 102min), and continue the test for 1000 hours. After the test, observe the surface of the sample with the naked eye to see if there are any discoloration, cracking, peeling and other phenomena, and use an electronic universal material testing machine to test the tensile strength in accordance with GB / T528-2009 "Determination of Tensile Stress-Strain Properties of Vulcanized Rubber or Thermoplastic Rubber" standard, and calculate the tensile strength retention rate, tensile strength retention rate = (tensile strength after aging / tensile strength before aging) × 100%.

[0034] 2. Wear resistance: Refer to GB / T1689-2014 "Determination of wear resistance of vulcanized rubber or thermoplastic rubber (using Akron abrasion tester)" standard, and use Akron abrasion tester for testing. The rubber runway sample is made into a standard test piece and installed on the tester. The contact pressure between the grinding wheel and the sample is set to 2.67N, the test stroke is 4001.6m, and the test temperature is controlled at (23±2)℃. After the test, the mass of the sample before and after the test is weighed with an electronic balance with an accuracy of 0.001g, and the wear amount is calculated based on the mass loss.

[0035] 3. Hydrophobic performance: The test is conducted using a self-designed hydrophobic performance test device. On a horizontal test bench, fix the rubber track sample with an area of ​​no less than 20cm×20cm. Use a graduated funnel to evenly pour 100mL of water on the surface of the sample within 3s, and start a stopwatch to observe and record the time it takes for the water to completely penetrate or flow away. Test each sample 5 times, and take the average value as the final hydrophobic performance test result.

[0036] 4. Antibacterial performance: According to GB / T21510-2008 "Test Method for Antibacterial Performance of Nano-inorganic Materials", the plate counting method is used for testing. Cut the rubber track sample into small discs with a diameter of 5 mm and put them into a sterile culture dish. Add 10 mL of a bacterial count of (1-5) × 10 6CFU / mL suspension of Escherichia coli or Aspergillus niger, immerse the sample completely in the bacterial solution, and culture it in a constant temperature incubator at (37±1)℃ for 24h (Escherichia coli) or 72h (Aspergillus niger). After the culture is completed, rinse the bacterial solution on the surface of the sample into a sterile test tube with sterile physiological saline and shake it evenly. Then, dilute the bacterial solution to an appropriate concentration using the ten-fold dilution method, take 0.1mL of the diluted bacterial solution and evenly spread it on a nutrient agar medium plate (nutrient agar medium for Escherichia coli and red Bengal medium for Aspergillus niger), and culture it in a constant temperature incubator at (37±1)℃ (Escherichia coli) or (28±1)℃ (Aspergillus niger) for 48h (Escherichia coli) or 72h (Aspergillus niger). After the culture is completed, use a colony counter to count the number of colonies on the plate and calculate the number of bacteria and mold colonies per square centimeter of the sample surface.

[0037] 5. Elasticity and impact resistance: According to GB / T10654-2001 "Determination of tensile strength and elongation at break of porous polymer elastic materials", the test is carried out using a falling ball impact tester. The rubber track sample is placed on a horizontal rigid base with a sample size of 100mm×100mm×20mm. A steel ball with a mass of 500g is selected and freely dropped from a height of 1m from the sample surface to impact the sample. The height of the steel ball rebounding after impact is measured by the displacement sensor installed on the test device. Each sample is tested 5 times, and the average value is taken as the rebound height to evaluate the elasticity and impact resistance of the rubber track.

[0038] Test items Example 4 Example 5 Example 6 Comparative Example 1 Comparative Example 2 Comparative Example 3 Aging resistance The surface is slightly discolored, and the tensile strength retention rate is 85%. The surface is slightly discolored, and the tensile strength retention rate is 88% The surface is slightly discolored, and the tensile strength retention rate is 86%. The surface is severely cracked and faded, and the tensile strength retention rate is 50% Obvious cracks appeared on the surface, and the tensile strength retention rate was 60% The surface is severely cracked and faded, and the tensile strength retention rate is 35%. Wear resistance (wear volume) 0.05cm³ / 1.61km 0.04cm³ / 1.61km 0.045cm³ / 1.61km 0.1cm³ / 1.61km 0.08cm³ / 1.61km 0.15cm³ / 1.61km Hydrophobic properties Water flows away in 5 seconds Water flows away in 4 seconds The water flows away in 4.5 seconds Water penetrates within 15 seconds Water penetrates within 12 seconds Water penetrates within 20 seconds Antimicrobial properties Bacterial colony count <10CFU / cm², no mold detected Bacterial colony count <10CFU / cm², no mold detected Bacterial colony count <10CFU / cm², no mold detected Bacterial colony count <50CFU / cm², mold 10CFU / cm² Bacterial colony count <40CFU / cm², mold 8CFU / cm² Bacterial colony count <80CFU / cm², mold 20CFU / cm² Elasticity and impact resistance Rebound height 80cm Rebound height 82cm Rebound height 81cm Rebound height 65cm Rebound height 70cm Rebound height 50cm Judging from the test data, the aging-resistant rubber runway of Examples 4-6 has significant advantages in various performances. In terms of aging resistance, after 1000 hours of artificial accelerated aging test, the surface of the example was only slightly discolored, and the tensile strength retention rate reached 85%-88%, while the comparative examples 1-3 showed serious cracking and fading, and the tensile strength retention rate was only 35% at the lowest, indicating that the modified rubber and polyurethane elastomer of the present invention greatly improved the aging resistance. In terms of wear resistance, the wear amount of the example was between 0.04-0.05cm³ / 1.61km, which was much lower than that of the comparative example. This was due to the synergistic effect between the raw materials, which enhanced the wear resistance of the runway. In the hydrophobic performance test, the water of the example flowed away quickly within 4-5 seconds, while the comparative example had a long penetration time, indicating that the addition of environmentally friendly hydrophobic fillers effectively improved the hydrophobic performance of the runway. In terms of antibacterial performance, the bacterial colony count of the example was <10CFU / cm² and no mold was detected, while the comparative example had a large colony count, and the use of antibacterial agents effectively inhibited the growth of microorganisms. In terms of elasticity and impact resistance, the rebound height of the embodiment reaches 80-82cm, which is significantly higher than that of the comparative example. The addition of hollow glass microspheres improves the elasticity and impact resistance of the runway, providing athletes with a better sports experience. Comparative Example 3 is also obviously inferior to Comparative Examples 1 and 2, which shows that the performance of the two materials has been improved after modification. Comprehensively considering various tests, the aging-resistant rubber runway of the present invention has excellent performance and can meet the needs of various outdoor sports venues.

[0039] The above contents are merely examples and explanations of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the invention or exceed the scope defined by the claims, they shall all fall within the protection scope of the present invention.

Claims

1. An anti-aging rubber track, characterized by: The invention comprises the following raw materials in parts by weight: 400-600 parts of modified rubber, 200-300 parts of modified polyurethane elastomer, 100-200 parts of environmentally friendly hydrophobic filler, 30-50 parts of antioxidant, 20-40 parts of plasticizer, 10-20 parts of cross-linking agent, 10-20 parts of active zinc oxide, 5-15 parts of nano titanium dioxide, 2-8 parts of graphene, 1-5 parts of antibacterial agent and 10-30 parts of hollow glass microspheres; Wherein, the modified rubber is prepared by the following steps: A1. Add cis-1,4-butadiene rubber, nano-silica and silane coupling agent KH550 into an internal mixer, heat to 110°C, stir and internally mix for 35 minutes to obtain pretreated rubber; A2. Transfer the pretreated rubber to an open mixing mill, cool it to 80°C, add the hindered amine light stabilizer GW-540 and the ultraviolet absorber UV-531, and mix them together for 20 minutes to obtain a secondary modified rubber; A3. Put the rubber after secondary modification into a reactor, introduce ozone, and react for 2 hours at a temperature of 45°C and an ozone concentration of 6 mg / L. After the reaction is completed, purge with nitrogen to remove excess ozone to obtain modified rubber.

2. The anti-aging rubber track according to claim 1, characterized in that: The modified polyurethane elastomer is prepared by the following steps: B1, polyoxypropylene glycol and toluene diisocyanate were added to the reaction kettle, heated to 85°C and stirred for 2 hours to generate a prepolymer, and nano calcium carbonate was added and stirred for another 2 hours to obtain intermediate 1; B2, cooling the intermediate 1 to 60°C, adding ethylenediamine chain extender and silicone rubber powder, and reacting for 2 hours to obtain intermediate 2; B3. Place the intermediate 2 into a mold and perform hot pressing vulcanization treatment at a temperature of 110° C. and a pressure of 8 MPa for 40 minutes to obtain a modified polyurethane elastomer.

3. The anti-aging rubber track according to claim 1, characterized in that: The environmentally friendly hydrophobic material is prepared by the following steps: 150 parts of diatomaceous earth, 10 parts of stearic acid, and 5 parts of polytetrafluoroethylene emulsion were weighed by weight, and stirred in a reactor at 80° C. for 2 hours to obtain an environmentally friendly hydrophobic filler.

4. The anti-aging rubber track according to claim 1, characterized in that: The dosage ratio of butadiene rubber, nano-silica and silane coupling agent KH550 in step A1 is 500 g:50 g:31.71 mL.

5. The anti-aging rubber track according to claim 1, characterized in that: The amount ratio of the pretreated rubber, the hindered amine light stabilizer GW-540, and the ultraviolet absorber UV-531 in step A2 is 450g:20g:15g.

6. The anti-aging rubber track according to claim 2, characterized in that: The dosage ratio of polyoxypropylene glycol, toluene diisocyanate and nano-calcium carbonate in step B1 is 198.02 mL:81.97 mL:30 g.

7. The anti-aging rubber track according to claim 2, characterized in that: The usage ratio of the intermediate 1, ethylenediamine chain extender and silicone rubber powder in step B2 is 200 g: 16.67 mL: 20 g.

8. The anti-aging rubber track according to claim 1, characterized in that: The antioxidant is one of antioxidant 1010 and antioxidant 300; the plasticizer is one of dioctyl phthalate, epoxy soybean oil, and tributyl citrate; and the crosslinking agent is one of diisopropylbenzene peroxide, sulfur, and triallyl isocyanurate.

9. The anti-aging rubber track according to claim 1, characterized in that: The antibacterial agent is one of nano zinc oxide, silver ion antibacterial agent and didecyl dimethyl ammonium chloride.

10. The method for preparing an aging-resistant rubber runway according to claim 1, characterized in that: The specific steps include: Weigh each raw material by weight, first add the modified rubber and modified polyurethane elastomer into an internal mixer, raise the temperature and stir evenly, then add active zinc oxide, nano titanium dioxide, graphene, antibacterial agent and hollow glass microspheres in sequence, stir evenly, then add environmentally friendly hydrophobic filler, antioxidant, plasticizer and cross-linking agent and mix well; then transfer the materials to an open mixer for thin rubber mixing, and then put them into a mold for hot pressing; after the hot pressing is completed, wait for the mold to cool to room temperature, take out the rubber, and cure it at room temperature to finally obtain aging-resistant rubber.