Thermoplastic elastomer material for artificial turf

Abstract

The invention relates to the technical field of artificial turf, and provides a thermoplastic elastomer material for artificial turf. The thermoplastic elastomer material for the artificial turf is prepared from the following raw materials in parts by weight: 40 to 60 parts of bio-based polyester elastomer, 20 to 30 parts of modified bamboo fiber, 15 to 20 parts of polypropylene, 15 to 25 parts of nano silicon dioxide, 10 to 16 parts of flexibilizer, 8 to 12 parts of epoxidized soybean oil, 3 to 5 parts of porous polylactic acid microspheres, 0.4 to 1 part of antioxidant and 0.6 to 0.8 part of anti-ultraviolet agent. According to the thermoplastic elastomer material for the artificial turf, the wear resistance is improved, and meanwhile a safer and more comfortable exercise environment is provided for athletes.

Description

Technical Field

[0001] The invention relates to the technical field of artificial turf, and in particular to a thermoplastic elastomer material for artificial turf. Background Art

[0002] With the booming development of the sports industry and the increasing awareness of environmental protection, artificial turf, as a new type of sports field material, has been widely used and popularized. Among them, thermoplastic elastomer (TPE) as a filling material for artificial turf has become a hot topic in industry research due to its unique physical properties and environmental characteristics.

[0003] TPE is a new type of polymer material between rubber and plastic, which has both the elasticity of rubber and the processing convenience of plastic. It can soften and shape when heated, and restore elasticity after cooling. This characteristic makes TPE widely used in many fields, especially in the field of artificial turf.

[0004] In artificial turf, TPE particles are used as filling materials, which not only give the turf a softer and shock-absorbing sports surface, effectively reducing the risk of injury to athletes, but also achieve a level of sports characteristics comparable to natural turf. In addition, TPE particles also have the advantages of natural color, good wear resistance, and low dust generation, providing athletes with a fresh and healthy sports environment.

[0005] Although TPE materials have many advantages in the field of artificial turf, existing TPE materials still have some problems. Some TPE particles have poor wear resistance and are easily worn during use, generating dust, which affects the performance of the venue and the health of athletes. The hardness of some TPE particles is too high or too low, resulting in the inappropriate hardness of the filled turf, affecting the athletes' sports experience and the service life of the turf.

[0006] In order to further improve the performance of thermoplastic elastomer materials for artificial turf and meet the dual demands of market and environmental protection, it is necessary to improve and innovate the existing TPE materials. Based on this, the present invention proposes a thermoplastic elastomer material for artificial turf. Summary of the invention

[0007] The invention provides a thermoplastic elastomer material for artificial turf, aiming at improving the wear resistance and aging resistance of the material.

[0008] The technical solution of the present invention is as follows: The invention provides a thermoplastic elastomer material for artificial turf, which is composed of the following raw materials in parts by weight: 40-60 parts of bio-based polyester elastomer, 20-30 parts of modified bamboo fiber, 15-20 parts of polypropylene, 15-25 parts of nano silicon dioxide, 10-16 parts of toughening agent, 8-12 parts of epoxy soybean oil, 3-5 parts of porous polylactic acid microspheres, 0.4-1 parts of antioxidant and 0.6-0.8 parts of anti-ultraviolet agent.

[0009] As a further technical solution, the preparation method of the modified bamboo fiber includes: immersing the bamboo fiber in an ethanol solution of silane coupling agent KH-550 with a mass fraction of 5%-9%, ultrasonically treating the bamboo fiber at 60-70°C for 30-40 minutes, and drying at 110-120°C to a moisture content of ≤0.3%.

[0010] As a further technical solution, the bamboo fiber has a length of 0.5-1.2 mm and a diameter of 15-30 μm.

[0011] As a further technical solution, the bio-based polyester elastomer includes PEPBSS; the toughening agent includes polybutylene terephthalate-adipate.

[0012] As a further technical solution, the preparation method of the porous polylactic acid microspheres includes: vacuum drying the polylactic acid at 70-80°C for 3-4 hours; ball milling the sodium bicarbonate to a particle size of less than 10 μm; then blending the polylactic acid, sodium bicarbonate, polyethylene glycol and stearic acid and extruding granulation to a particle diameter of 1-2 mm; treating the particles in water vapor for 10-15 minutes to form porous microspheres.

[0013] As a further technical solution, the weight ratio of the polylactic acid to sodium bicarbonate, polyethylene glycol and stearic acid is 100:4-6:4-5:1-1.2.

[0014] As a further technical solution, the extrusion is carried out through a twin-screw extruder at an extrusion temperature of 165-175° C. and a screw speed of 120-140 rpm.

[0015] As a further technical solution, the antioxidant includes antioxidant 168 and antioxidant 1010 in a weight ratio of 1:2-3.

[0016] As a further technical solution, the anti-ultraviolet agent is the anti-ultraviolet agent UV-531.

[0017] The present invention also proposes a preparation method of the thermoplastic elastomer material for artificial turf, which comprises the following steps: premixing the bio-based elastomer with polypropylene in an internal mixer at 90-100° C. for 5-10 minutes at a rotation speed of 50-60 rpm; adding modified bamboo fiber, nano-silicon dioxide, porous polylactic acid microspheres, a toughening agent, epoxy soybean oil, an anti-aging agent and an anti-ultraviolet agent, heating to 120-140° C., increasing the rotation speed to 80-90 rpm, and mixing for 5-10 minutes; and melt extruding and granulating the material using a twin-screw extruder, wherein the screw speed is 200-250 rpm, the temperature of the first zone of the extruder is 160-170° C., the temperature of the second zone is 180-190° C., and the head temperature is 160-170° C.

[0018] The working principle and beneficial effects of the present invention are: The present invention immerses bamboo fiber in an ethanol solution of silane coupling agent KH-550 and performs ultrasonic treatment and drying. The silane coupling agent can form a chemically bonded film on the surface of the bamboo fiber. This film not only improves the interfacial bonding force between the bamboo fiber and the thermoplastic elastomer matrix, but also reduces the hydrophilicity of the bamboo fiber, thereby improving the overall strength and water resistance of the material. In addition, the alkoxy groups in the silane molecules undergo hydrolysis and condensation reactions with the hydroxyl groups on the surface of the bamboo fiber to form Si-OC covalent bonds, and the Si-OH and -OH groups of the bamboo fiber are dehydrated to form a stable interface layer. This chemical bonding significantly improves the compatibility of the fiber with bio-based polyester elastomers (such as PEPBSS); In the present invention, the fiber length is strictly controlled to be 0.5-1.2 mm and the diameter is 15-30 μm. By constructing a three-dimensional network reinforcement structure with a height-to-diameter ratio (50-80), it can ensure good dispersion and reinforcement effects in the thermoplastic elastomer matrix. This optimization not only improves the mechanical properties of the material, but also ensures the uniformity and stability of the material. When the short fibers are randomly distributed in the matrix, when the critical length meets the stress transfer requirements, they can effectively bear external forces. At the same time, ultrasonic treatment makes the fibers evenly dispersed to avoid stress concentration.

[0019] In the present invention, sodium bicarbonate is used as a physical foaming agent, which decomposes and produces CO2 gas during the twin-screw extrusion process at 165-175°C. By precisely controlling the extrusion temperature to be higher than the melting point of PLA but lower than the threshold for drastic gas release, the gas forms a closed-cell structure in the molten PLA matrix, and the water vapor post-treatment further expands the porosity to form a multi-level pore structure. When subjected to external forces, this porous structure can absorb and disperse energy through the pores, thereby improving the material's wear resistance and toughness. In addition, polylactic acid, as a bio-based material, has good biocompatibility and degradability. By optimizing the ratio of polylactic acid to sodium bicarbonate, polyethylene glycol and stearic acid, the stability and performance of the porous microspheres can be ensured.

[0020] In the present invention, the modified bamboo fiber and nano-SiO2 form a "rigid skeleton", and the porous microspheres serve as "flexible nodes" to form an interpenetrating network that is both rigid and flexible. Nano-SiO2 is adsorbed on the fiber surface through van der Waals force to form a ternary stress transfer channel of "fiber-nanoparticle-microsphere". The modified bamboo fiber provides an effective reinforcement effect for the thermoplastic elastomer matrix with its high strength and rigidity; while the porous polylactic acid microspheres provide the material with excellent toughness and wear resistance through their porous structure and energy absorption capacity. The synergistic effect of the two makes the thermoplastic elastomer material for artificial turf have good toughness and wear resistance while maintaining high strength. DETAILED DESCRIPTION

[0021] 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.

[0022] It should be noted that the model of polypropylene is PPK8003; the model of polylactic acid is PLA3052D; the model of polyethylene glycol is PEG-4000; the model of stearic acid is 1805; PEPBSS is prepared by the method of Example 1 in the patent publication number CN114517001B; and the model of polybutylene terephthalate-adipate is C1200.

[0023] Example 1 In this embodiment, a thermoplastic elastomer material for artificial turf is provided, which is composed of the following raw materials in parts by weight: 50 parts of bio-based polyester elastomer, 25 parts of modified bamboo fiber, 17 parts of polypropylene, 20 parts of nano-silicon dioxide, 13 parts of toughening agent, 10 parts of epoxy soybean oil, 4 parts of porous polylactic acid microspheres, 0.7 parts of antioxidant, and 0.7 parts of anti-ultraviolet agent.

[0024] The preparation method of the modified bamboo fiber includes: immersing the bamboo fiber in an ethanol solution of silane coupling agent KH-550 with a mass fraction of 7%, ultrasonically treating the bamboo fiber at 65°C for 35 minutes, and drying the bamboo fiber at 115°C until the moisture content is ≤0.3%; the length of the bamboo fiber is 0.9 mm and the diameter is 22 μm; The bio-based polyester elastomer is PEPBSS; the toughening agent is polybutylene terephthalate-adipate; the antioxidant includes antioxidant 168 and antioxidant 1010 in a weight ratio of 1:2.5; the anti-ultraviolet agent is anti-ultraviolet agent UV-531; Among them, the preparation method of porous polylactic acid microspheres includes: vacuum drying polylactic acid at 75°C for 3.5 hours; ball-milling sodium bicarbonate to a particle size of less than 10 μm; then blending polylactic acid, sodium bicarbonate, polyethylene glycol and stearic acid for extrusion granulation, the extrusion temperature is 170°C, the screw speed is 130 rpm, and the average diameter of the extruded granulated particles is 1.5 mm; treating the particles in water vapor for 12 minutes to form porous microspheres; the weight ratio of polylactic acid to sodium bicarbonate, polyethylene glycol and stearic acid is 100:5:4.5:1.1.

[0025] The preparation steps of the thermoplastic elastomer material for artificial turf include: premixing the bio-based elastomer and polypropylene in an internal mixer at 95° C. for 7 minutes at a rotation speed of 55 rpm; adding modified bamboo fiber, nano-silicon dioxide, porous polylactic acid microspheres, a toughening agent, epoxy soybean oil, an anti-aging agent and an anti-ultraviolet agent, heating to 130° C., increasing the rotation speed to 85 rpm, and mixing for 7 minutes; and melt-extruding and granulating the material using a twin-screw extruder, wherein the screw speed is 220 rpm, the temperature of the first zone of the extruder is 165° C., the temperature of the second zone is 185° C., and the head temperature is 165° C.

[0026] Example 2 In this embodiment, a thermoplastic elastomer material for artificial turf is provided, which is composed of the following raw materials in parts by weight: 40 parts of bio-based polyester elastomer, 20 parts of modified bamboo fiber, 15 parts of polypropylene, 15 parts of nano-silicon dioxide, 10 parts of toughening agent, 8 parts of epoxy soybean oil, 3 parts of porous polylactic acid microspheres, 0.4 parts of antioxidant, and 0.6 parts of anti-ultraviolet agent.

[0027] The preparation method of the modified bamboo fiber includes: immersing the bamboo fiber in an ethanol solution of silane coupling agent KH-550 with a mass fraction of 5%, ultrasonically treating the bamboo fiber at 60°C for 30 minutes, and drying the bamboo fiber at 110°C until the moisture content is ≤0.3%; the length of the bamboo fiber is 0.5 mm and the diameter is 15 μm; The bio-based polyester elastomer is PEPBSS; the toughening agent includes polybutylene terephthalate-adipate; the antioxidant includes antioxidant 168 and antioxidant 1010 in a weight ratio of 1:2; the anti-ultraviolet agent is anti-ultraviolet agent UV-531; Among them, the preparation method of porous polylactic acid microspheres includes: vacuum drying polylactic acid at 70°C for 3 hours; ball milling sodium bicarbonate to a particle size of less than 10 μm; then blending polylactic acid, sodium bicarbonate, polyethylene glycol and stearic acid for extrusion granulation, the extrusion temperature is 165°C, the screw speed is 120rpm, and the average diameter of the extruded granulated particles is 1mm; treating the particles in water vapor for 10 minutes to form porous microspheres; the weight ratio of polylactic acid to sodium bicarbonate, polyethylene glycol and stearic acid is 100:4:4:1.

[0028] The preparation steps of the thermoplastic elastomer material for artificial turf include: premixing the bio-based elastomer and polypropylene in an internal mixer at 90° C. for 5 minutes at a rotation speed of 50 rpm; adding modified bamboo fiber, nano-silicon dioxide, porous polylactic acid microspheres, a toughening agent, epoxy soybean oil, an anti-aging agent and an anti-ultraviolet agent, heating to 120° C., increasing the rotation speed to 80 rpm, and mixing for 5 minutes; and melt-extruding and granulating the material using a twin-screw extruder, wherein the screw speed is 200 rpm, the temperature of the first zone of the extruder is 160° C., the temperature of the second zone is 180° C., and the temperature of the die head is 160° C.

[0029] Example 3 In this embodiment, a thermoplastic elastomer material for artificial turf is provided, which is composed of the following raw materials in parts by weight: 60 parts of bio-based polyester elastomer, 30 parts of modified bamboo fiber, 20 parts of polypropylene, 25 parts of nano-silicon dioxide, 16 parts of toughening agent, 12 parts of epoxy soybean oil, 5 parts of porous polylactic acid microspheres, 1 part of antioxidant, and 0.8 parts of anti-ultraviolet agent.

[0030] The preparation method of the modified bamboo fiber includes: immersing the bamboo fiber in an ethanol solution of silane coupling agent KH-550 with a mass fraction of 9%, ultrasonically treating the bamboo fiber at 70°C for 40 minutes, and drying the bamboo fiber at 120°C until the moisture content is ≤0.3%; the length of the bamboo fiber is 1.2 mm and the diameter is 30 μm; The bio-based polyester elastomer is PEPBSS; the toughening agent includes polybutylene terephthalate-adipate; the antioxidant includes antioxidant 168 and antioxidant 1010 in a weight ratio of 1:3; the anti-ultraviolet agent is anti-ultraviolet agent UV-531; Among them, the preparation method of porous polylactic acid microspheres includes: vacuum drying polylactic acid at 80°C for 4 hours; ball-milling sodium bicarbonate to a particle size of less than 10 μm; then blending polylactic acid, sodium bicarbonate, polyethylene glycol and stearic acid for extrusion granulation, the extrusion temperature is 175°C, the screw speed is 140 rpm, and the average diameter of the extruded granulated particles is 2 mm; treating the particles in water vapor for 15 minutes to form porous microspheres; the weight ratio of polylactic acid to sodium bicarbonate, polyethylene glycol and stearic acid is 100:6:5:1.2.

[0031] The preparation steps of the thermoplastic elastomer material for artificial turf include: premixing the bio-based elastomer and polypropylene in an internal mixer at 100°C for 10 minutes at a rotation speed of 60 rpm; adding modified bamboo fiber, nano-silicon dioxide, porous polylactic acid microspheres, a toughening agent, epoxy soybean oil, an anti-aging agent and an anti-ultraviolet agent, heating to 140°C, increasing the rotation speed to 90 rpm, and mixing for 10 minutes; and using a twin-screw extruder for melt extrusion granulation to obtain the material, wherein the screw speed is 250 rpm, the temperature of the first zone of the extruder is 170°C, the temperature of the second zone is 190°C, and the temperature of the die head is 170°C.

[0032] Example 4 In this embodiment, a thermoplastic elastomer material for artificial turf is provided, which is composed of the following raw materials in parts by weight: 40 parts of bio-based polyester elastomer, 20 parts of modified bamboo fiber, 20 parts of polypropylene, 15 parts of nano-silicon dioxide, 16 parts of toughening agent, 8 parts of epoxy soybean oil, 5 parts of porous polylactic acid microspheres, 0.4 parts of antioxidant, and 0.8 parts of anti-ultraviolet agent.

[0033] The preparation method of the modified bamboo fiber includes: immersing the bamboo fiber in an ethanol solution of silane coupling agent KH-550 with a mass fraction of 5%, ultrasonically treating the bamboo fiber at 70°C for 30 minutes, and drying the bamboo fiber at 120°C until the moisture content is ≤0.3%; the length of the bamboo fiber is 1.2 mm and the diameter is 15 μm; The bio-based polyester elastomer is PEPBSS; the toughening agent includes polybutylene terephthalate-adipate; the antioxidant includes antioxidant 168 and antioxidant 1010 in a weight ratio of 1:3; the anti-ultraviolet agent is anti-ultraviolet agent UV-531; Among them, the preparation method of porous polylactic acid microspheres includes: vacuum drying polylactic acid at 80°C for 3 hours; ball milling sodium bicarbonate to a particle size of less than 10 μm; then blending polylactic acid, sodium bicarbonate, polyethylene glycol and stearic acid for extrusion granulation, the extrusion temperature is 165°C, the screw speed is 140rpm, and the average diameter of the extruded granulated particles is 2mm; treating the particles in water vapor for 10 minutes to form porous microspheres; the weight ratio of polylactic acid to sodium bicarbonate, polyethylene glycol and stearic acid is 100:6:4:1.2.

[0034] The preparation steps of the thermoplastic elastomer material for artificial turf include: premixing the bio-based elastomer and polypropylene in an internal mixer at 100°C for 5 minutes at a rotation speed of 50 rpm; adding modified bamboo fiber, nano-silicon dioxide, porous polylactic acid microspheres, a toughening agent, epoxy soybean oil, an anti-aging agent and an anti-ultraviolet agent, heating to 140°C, increasing the rotation speed to 90 rpm, and mixing for 5 minutes; and using a twin-screw extruder for melt extrusion granulation to obtain the material, wherein the screw speed is 250 rpm, the temperature of the first zone of the extruder is 160°C, the temperature of the second zone is 190°C, and the head temperature is 160°C.

[0035] Comparative Example 1 The present comparative example provides a thermoplastic elastomer material for artificial turf, which is composed of the following raw materials in parts by weight: 50 parts of bio-based polyester elastomer, 25 parts of bamboo fiber, 17 parts of polypropylene, 20 parts of nano-silicon dioxide, 13 parts of toughening agent, 10 parts of epoxy soybean oil, 4 parts of porous polylactic acid microspheres, 0.7 parts of antioxidant, and 0.7 parts of anti-ultraviolet agent.

[0036] Among them, the length of bamboo fiber is 0.9mm and the diameter is 22μm; The bio-based polyester elastomer is PEPBSS; the toughening agent is polybutylene terephthalate-adipate; the antioxidant includes antioxidant 168 and antioxidant 1010 in a weight ratio of 1:2.5; the anti-ultraviolet agent is anti-ultraviolet agent UV-531; Among them, the preparation method of porous polylactic acid microspheres includes: vacuum drying polylactic acid at 75°C for 3.5 hours; ball-milling sodium bicarbonate to a particle size of less than 10 μm; then blending polylactic acid, sodium bicarbonate, polyethylene glycol and stearic acid for extrusion granulation, the extrusion temperature is 170°C, the screw speed is 130 rpm, and the average diameter of the extruded granulated particles is 1.5 mm; treating the particles in water vapor for 12 minutes to form porous microspheres; the weight ratio of polylactic acid to sodium bicarbonate, polyethylene glycol and stearic acid is 100:5:4.5:1.1.

[0037] The preparation steps of the thermoplastic elastomer material for artificial turf include: premixing the bio-based elastomer with polypropylene in an internal mixer at 95° C. for 7 minutes at a rotation speed of 55 rpm; adding bamboo fiber, nano-silicon dioxide, porous polylactic acid microspheres, a toughening agent, epoxy soybean oil, an anti-aging agent and an anti-ultraviolet agent, heating to 130° C., increasing the rotation speed to 85 rpm, and mixing for 7 minutes; and melt-extruding and granulating the material using a twin-screw extruder, wherein the screw speed is 220 rpm, the temperature of the first zone of the extruder is 165° C., the temperature of the second zone is 185° C., and the temperature of the die head is 165° C.

[0038] Comparative Example 2 The present comparative example provides a thermoplastic elastomer material for artificial turf, which is composed of the following raw materials in parts by weight: 50 parts of bio-based polyester elastomer, 25 parts of modified bamboo fiber, 17 parts of polypropylene, 20 parts of nano-silicon dioxide, 13 parts of toughening agent, 10 parts of epoxidized soybean oil, 0.7 parts of antioxidant, and 0.7 parts of anti-ultraviolet agent.

[0039] The preparation method of the modified bamboo fiber includes: immersing the bamboo fiber in an ethanol solution of silane coupling agent KH-550 with a mass fraction of 7%, ultrasonically treating the bamboo fiber at 65°C for 35 minutes, and drying the bamboo fiber at 115°C until the moisture content is ≤0.3%; the length of the bamboo fiber is 0.9 mm and the diameter is 22 μm; The bio-based polyester elastomer is PEPBSS; the toughening agent is polybutylene terephthalate-adipate; the antioxidant includes antioxidant 168 and antioxidant 1010 in a weight ratio of 1:2.5; the anti-ultraviolet agent is anti-ultraviolet agent UV-531; The preparation steps of the thermoplastic elastomer material for artificial turf include: premixing the bio-based elastomer and polypropylene in an internal mixer at 95°C for 7 minutes at a rotation speed of 55 rpm; adding modified bamboo fiber, nano-silicon dioxide, a toughening agent, epoxy soybean oil, an anti-aging agent and an anti-ultraviolet agent, heating to 130°C, increasing the rotation speed to 85 rpm, and mixing for 7 minutes; and melt extruding and granulating the material using a twin-screw extruder, wherein the screw speed is 220 rpm, the temperature of the first zone of the extruder is 165°C, the temperature of the second zone is 185°C, and the head temperature is 165°C.

[0040] Comparative Example 3 The present comparative example provides a thermoplastic elastomer material for artificial turf, which is composed of the following raw materials in parts by weight: 50 parts of bio-based polyester elastomer, 25 parts of bamboo fiber, 17 parts of polypropylene, 20 parts of nano-silicon dioxide, 13 parts of toughening agent, 10 parts of epoxy soybean oil, 0.7 parts of antioxidant, and 0.7 parts of anti-ultraviolet agent.

[0041] Among them, the length of bamboo fiber is 0.9mm and the diameter is 22μm; The bio-based polyester elastomer is PEPBSS; the toughening agent is polybutylene terephthalate-adipate; the antioxidant includes antioxidant 168 and antioxidant 1010 in a weight ratio of 1:2.5; the anti-ultraviolet agent is anti-ultraviolet agent UV-531; The preparation steps of the thermoplastic elastomer material for artificial turf include: premixing the bio-based elastomer with polypropylene in an internal mixer at 95° C. for 7 minutes at a rotation speed of 55 rpm; adding bamboo fiber, nano-silicon dioxide, a toughening agent, epoxy soybean oil, an anti-aging agent and an anti-ultraviolet agent, heating to 130° C., increasing the rotation speed to 85 rpm, and mixing for 7 minutes; and melt-extruding and granulating the material using a twin-screw extruder, wherein the screw speed is 220 rpm, the temperature of the first zone of the extruder is 165° C., the temperature of the second zone is 185° C., and the temperature of the die head is 165° C.

[0042] Comparative Example 4 The present comparative example provides a thermoplastic elastomer material for artificial turf, which is composed of the following raw materials in parts by weight: 50 parts of bio-based polyester elastomer, 25 parts of modified bamboo fiber, 17 parts of polypropylene, 20 parts of nano-silicon dioxide, 13 parts of toughening agent, 10 parts of epoxy soybean oil, 4 parts of porous polylactic acid microspheres, 0.7 parts of antioxidant, and 0.7 parts of anti-ultraviolet agent.

[0043] The preparation method of the modified bamboo fiber includes: immersing the bamboo fiber in an ethanol solution of silane coupling agent KH-550 with a mass fraction of 7%, ultrasonically treating the bamboo fiber at 65°C for 35 minutes, and drying the bamboo fiber at 115°C until the moisture content is ≤0.3%; the length of the bamboo fiber is 0.9 mm and the diameter is 22 μm; The bio-based polyester elastomer is PEPBSS; the toughening agent is polybutylene terephthalate-adipate; the antioxidant includes antioxidant 168 and antioxidant 1010 in a weight ratio of 1:2.5; the anti-ultraviolet agent is anti-ultraviolet agent UV-531; Among them, the preparation method of porous polylactic acid microspheres includes: vacuum drying polylactic acid at 75°C for 3.5 hours; ball milling sodium bicarbonate to a particle size of less than 10 μm; then blending polylactic acid, sodium bicarbonate, polyethylene glycol and stearic acid for extrusion granulation, the extrusion temperature is 170°C, the screw speed is 130 rpm, and the average diameter of the extruded granulated particles is 1.5 mm; treating the particles in water vapor for 12 minutes to form porous microspheres; the weight ratio of polylactic acid to sodium bicarbonate, polyethylene glycol and stearic acid is 100:2.5:4.5:1.1.

[0044] The preparation steps of the thermoplastic elastomer material for artificial turf include: premixing the bio-based elastomer and polypropylene in an internal mixer at 95° C. for 7 minutes at a rotation speed of 55 rpm; adding modified bamboo fiber, nano-silicon dioxide, porous polylactic acid microspheres, a toughening agent, epoxy soybean oil, an anti-aging agent and an anti-ultraviolet agent, heating to 130° C., increasing the rotation speed to 85 rpm, and mixing for 7 minutes; and melt-extruding and granulating the material using a twin-screw extruder, wherein the screw speed is 220 rpm, the temperature of the first zone of the extruder is 165° C., the temperature of the second zone is 185° C., and the head temperature is 165° C.

[0045] Comparative Example 5 The present comparative example provides a thermoplastic elastomer material for artificial turf, which is composed of the following raw materials in parts by weight: 50 parts of bio-based polyester elastomer, 25 parts of modified bamboo fiber, 17 parts of polypropylene, 20 parts of nano-silicon dioxide, 13 parts of toughening agent, 10 parts of epoxy soybean oil, 4 parts of porous polylactic acid microspheres, 0.7 parts of antioxidant, and 0.7 parts of anti-ultraviolet agent.

[0046] The preparation method of the modified bamboo fiber includes: immersing the bamboo fiber in an ethanol solution of silane coupling agent KH-550 with a mass fraction of 7%, ultrasonically treating the bamboo fiber at 65°C for 35 minutes, and drying the bamboo fiber at 115°C until the moisture content is ≤0.3%; the length of the bamboo fiber is 0.9 mm and the diameter is 22 μm; The bio-based polyester elastomer is PEPBSS; the toughening agent is polybutylene terephthalate-adipate; the antioxidant includes antioxidant 168 and antioxidant 1010 in a weight ratio of 1:2.5; the anti-ultraviolet agent is anti-ultraviolet agent UV-531; Among them, the preparation method of porous polylactic acid microspheres includes: vacuum drying polylactic acid at 75°C for 3.5 hours; ball-milling sodium bicarbonate to a particle size of less than 10 μm; then blending polylactic acid, sodium bicarbonate, polyethylene glycol and stearic acid for extrusion granulation, the extrusion temperature is 170°C, the screw speed is 130 rpm, and the average diameter of the extruded granulated particles is 1.5 mm; treating the particles in water vapor for 12 minutes to form porous microspheres; the weight ratio of polylactic acid to sodium bicarbonate, polyethylene glycol and stearic acid is 100:5:4.5:1.1.

[0047] The preparation steps of the thermoplastic elastomer material for artificial turf include: adding modified bamboo fiber, nano-silicon dioxide, porous polylactic acid microspheres, toughening agent, epoxy soybean oil, anti-aging agent and anti-ultraviolet agent to bio-based elastomer and polypropylene, heating to 130°C, increasing the speed to 85rpm, and kneading for 7 minutes; and using a twin-screw extruder for melt extrusion granulation to obtain the material, wherein the screw speed is 220rpm, the temperature of the first zone of the extruder is 165°C, the temperature of the second zone is 185°C, and the head temperature is 165°C.

[0048] Comparative Example 6 The present comparative example provides a thermoplastic elastomer material for artificial turf, which is composed of the following raw materials in parts by weight: 50 parts of bio-based polyester elastomer, 25 parts of modified bamboo fiber, 17 parts of polypropylene, 20 parts of talcum powder, 13 parts of toughening agent, 10 parts of epoxy soybean oil, 4 parts of porous polylactic acid microspheres, 0.7 parts of antioxidant, and 0.7 parts of anti-ultraviolet agent.

[0049] The preparation method of the modified bamboo fiber includes: immersing the bamboo fiber in an ethanol solution of silane coupling agent KH-550 with a mass fraction of 7%, ultrasonically treating the bamboo fiber at 65°C for 35 minutes, and drying the bamboo fiber at 115°C until the moisture content is ≤0.3%; the length of the bamboo fiber is 0.9 mm and the diameter is 22 μm; The bio-based polyester elastomer is PEPBSS; the toughening agent is polybutylene terephthalate-adipate; the antioxidant includes antioxidant 168 and antioxidant 1010 in a weight ratio of 1:2.5; the anti-ultraviolet agent is anti-ultraviolet agent UV-531; Among them, the preparation method of porous polylactic acid microspheres includes: vacuum drying polylactic acid at 75°C for 3.5 hours; ball-milling sodium bicarbonate to a particle size of less than 10 μm; then blending polylactic acid, sodium bicarbonate, polyethylene glycol and stearic acid for extrusion granulation, the extrusion temperature is 170°C, the screw speed is 130 rpm, and the average diameter of the extruded granulated particles is 1.5 mm; treating the particles in water vapor for 12 minutes to form porous microspheres; the weight ratio of polylactic acid to sodium bicarbonate, polyethylene glycol and stearic acid is 100:5:4.5:1.1.

[0050] The preparation steps of the thermoplastic elastomer material for artificial turf include: premixing the bio-based elastomer and polypropylene in an internal mixer at 95° C. for 7 minutes at a rotation speed of 55 rpm; adding modified bamboo fiber, talcum powder, porous polylactic acid microspheres, a toughening agent, epoxy soybean oil, an anti-aging agent and an anti-ultraviolet agent, heating to 130° C., increasing the rotation speed to 85 rpm, and mixing for 7 minutes; and using a twin-screw extruder for melt extrusion granulation to obtain the material, wherein the screw speed is 220 rpm, the temperature of the first zone of the extruder is 165° C., the temperature of the second zone is 185° C., and the head temperature is 165° C.

[0051] Test Example 1: The thermoplastic elastomer materials prepared in the above-mentioned Examples 1-4 and Comparative Examples 1-6 were tested as follows: 1. Wear resistance: Referring to ISO 4649, the thermoplastic elastomer materials prepared in Examples 1-4 and Comparative Examples 1-6 were made into cylindrical specimens with a diameter of 16±0.2 mm and a thickness of ≥6 mm. The specimens were polished with 60-mesh aluminum oxide sandpaper. The specimens were installed and a normal force of 10 N was applied. The roller was started to rub for 40 m. The wear debris on the surface of the sandpaper was cleaned after every 10 m of travel. Relative wear amount = ΔV 试样 / ΔV 标准 ×100%, standard rubber volume loss ΔV 标准 =250±20mm 3 ; 2. Tensile strength: The tensile strength was measured according to ASTM D638, using a universal material testing machine at a tensile speed of 50 mm / min; 3. Heat aging resistance: refer to ASTM D3045 test, aging conditions 120℃×168h; 4. Water absorption: refer to ASTM D570 test, the test conditions are immersion in water at 23℃ for 24h; The test results are shown in Table 1 below: Table 1

[0052] Combined with the above data, it can be seen that the tensile strength of comparative example 1 is significantly lower than that of example 1, and the water absorption rate is higher, indicating that the silane coupling agent treatment effectively improves the interfacial bonding between the fiber and the matrix and reduces the hydrophilicity. The wear resistance of comparative example 2 is inferior to that of example 1, indicating that the microspheres absorb energy through the pore structure and improve the wear resistance. However, the tensile strength of comparative example 4 decreases, indicating that sufficient foaming agent is the key to forming an effective porous structure. The tensile strength of comparative example 5 is lower than that of example 1, proving that premixing can optimize the compatibility of elastomers and polypropylene and ensure uniform dispersion of fillers. The wear resistance and tensile strength of comparative example 6 are significantly reduced, indicating that the high specific surface area of ​​nano-silica can more effectively improve the rigidity and wear resistance of the material. Example 3 achieves the best tensile strength and wear resistance through a high content of bio-based elastomer and an optimized filler ratio, but the water absorption rate is slightly high, and it is necessary to balance the bio-based content and water absorption.

[0053] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A thermoplastic elastomer material for artificial turf, characterized in that: The invention is composed of the following raw materials in parts by weight: 40-60 parts of bio-based polyester elastomer, 20-30 parts of modified bamboo fiber, 15-20 parts of polypropylene, 15-25 parts of nano silicon dioxide, 10-16 parts of toughening agent, 8-12 parts of epoxy soybean oil, 3-5 parts of porous polylactic acid microspheres, 0.4-1 parts of antioxidant and 0.6-0.8 parts of anti-ultraviolet agent.

2. The thermoplastic elastomer material for artificial turf according to claim 1, characterized in that: The preparation method of the modified bamboo fiber comprises: immersing the bamboo fiber in an ethanol solution of silane coupling agent KH-550 with a mass fraction of 5%-9%, ultrasonically treating the bamboo fiber at 60-70° C. for 30-40 minutes, and drying the bamboo fiber at 110-120° C. until the moisture content is ≤0.3%.

3. The thermoplastic elastomer material for artificial turf according to claim 2, characterized in that: The bamboo fiber has a length of 0.5-1.2 mm and a diameter of 15-30 μm.

4. The thermoplastic elastomer material for artificial turf according to claim 1, characterized in that: The bio-based polyester elastomer includes PEPBSS; and the toughening agent includes polybutylene terephthalate-adipate.

5. The thermoplastic elastomer material for artificial turf according to claim 1, characterized in that: The preparation method of the porous polylactic acid microspheres comprises: vacuum drying the polylactic acid at 70-80°C for 3-4 hours; ball-milling the sodium bicarbonate to a particle size of less than 10 μm; then blending the polylactic acid, sodium bicarbonate, polyethylene glycol and stearic acid to form granules with a particle diameter of 1-2 mm; and treating the granules in water vapor for 10-15 minutes to form porous microspheres.

6. The thermoplastic elastomer material for artificial turf according to claim 5, characterized in that: The weight ratio of the polylactic acid to sodium bicarbonate, polyethylene glycol and stearic acid is 100:4-6:4-5:1-1.

2.

7. The thermoplastic elastomer material for artificial turf according to claim 5, characterized in that: The extrusion is carried out by a twin-screw extruder, the extrusion temperature is 165-175° C., and the screw speed is 120-140 rpm.

8. The thermoplastic elastomer material for artificial turf according to claim 1, characterized in that: The antioxidant includes antioxidant 168 and antioxidant 1010 in a weight ratio of 1:2-3.

9. The thermoplastic elastomer material for artificial turf according to claim 1, characterized in that: The anti-ultraviolet agent is anti-ultraviolet agent UV-531.

10. The method for preparing a thermoplastic elastomer material for artificial turf according to any one of claims 1 to 9, characterized in that the steps include: The bio-based elastomer and polypropylene are premixed in an internal mixer at 90-100°C for 5-10 minutes at a speed of 50-60rpm; modified bamboo fiber, nano-silica, porous polylactic acid microspheres, toughening agent, epoxy soybean oil, anti-aging agent and anti-ultraviolet agent are added, the temperature is raised to 120-140°C, the speed is increased to 80-90rpm, and mixing is performed for 5-10 minutes; a twin-screw extruder is used for melt extrusion granulation, wherein the screw speed is 200-250rpm, the temperature of the first zone of the extruder is 160-170°C, the temperature of the second zone is 180-190°C, and the temperature of the die head is 160-170°C.

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