Environment-friendly prefabricated TPE plastic track material and preparation method thereof

Abstract

The application discloses an environment-friendly prefabricated TPE plastic track material and a preparation method thereof, and relates to the technical field of plastic track materials.The environment-friendly prefabricated TPE plastic track material comprises a weather-resistant wear-resistant embossed layer, an elastic supporting layer, a sticky coating layer and a gravel layer.The environment-friendly prefabricated TPE plastic track material does not use glue during construction, and only needs to be bonded with the road surface through the gravel layer and cement, so that the construction is easy, safety and environmental protection are good, wear resistance is good, the service life is long, the use quality of the plastic track is obviously improved, and the service life of the plastic track is prolonged.

Description

Technical Field

[0001] This invention relates to the field of plastic running track materials technology, specifically to an environmentally friendly prefabricated TPE plastic running track material and its preparation method. Background Technology

[0002] With sustained and rapid economic development and rising living standards, fitness activities are receiving increasing attention, and the conversion of sports field surfaces to synthetic turf is becoming increasingly common. Many cities are covering previously bare earthen sports fields in schools with synthetic running tracks, which helps control dust and improves sports conditions. However, the debate over whether sports fields should be paved with synthetic running tracks has recently intensified. The focus of the debate is whether synthetic running tracks are safe and harmless, and whether the toxic and harmful substances released by them have reached levels that could affect human health.

[0003] Currently, international sports running track paving materials can be divided into two main categories: natural polymer materials and synthetic polymer materials. Natural polymer materials are primarily natural rubber, while synthetic polymer materials are mainly ethylene propylene rubber (EPR). During on-site construction, rubber granules are mixed with adhesive and then laid on asphalt or cement surfaces. Of course, some prefabricated running tracks can be constructed quickly. However, most running tracks currently on the market use adhesives during construction, resulting in a strong odor.

[0004] Although the standards for green products vary from country to country, they all emphasize that products should be beneficial to human health and environmental protection. Therefore, the green development of environmentally friendly, solvent-free, low-VOC, odorless, and pollution-free plastic running track sports flooring materials is in line with the interests of the public and the direction of sustainable industrial development. It is beneficial to the country and its people and is imperative.

[0005] Thermoplastic elastomers (TPEs) are materials that possess the high elasticity, high strength, and high resilience of rubber, while also exhibiting malleable processing characteristics. TPEs offer numerous advantages, including being environmentally friendly, non-toxic, and safe; having a wide hardness range; excellent colorability; a soft touch; superior processing performance; requiring no vulcanization; and excellent weather resistance, fatigue resistance, and temperature resistance. Therefore, as a novel, multifunctional, and environmentally friendly material, TPEs have a very broad market application, including in household appliances, sporting goods, automotive materials, medical devices, construction, and footwear manufacturing.

[0006] When TPE is used as a material for plastic running tracks, it is required to have good elasticity, strength, weather resistance, and environmental performance. In existing technologies, TPE materials are generally prepared from thermoplastic polypropylene (PP), thermoplastic elastomer hydrogenated styrene-butadiene-styrene block copolymer (SEBS) with oil extrusion, and suitable fillers. Among them, SEBS has excellent rubber elasticity, weather resistance, low-temperature resistance, environmental friendliness, and recyclability, making it very suitable for the production of plastic running tracks. Modifying SEBS with PP can, on the one hand, reduce the melt viscosity of SEBS, making it easier to process; on the other hand, it can effectively improve the mechanical properties of the SEBS elastomer system. The application of fillers in the polymer can improve the mechanical and thermodynamic properties of the material to a certain extent. However, there are some problems with the use of TPE plastic running tracks on the market, the two biggest being: 1. The use of large amounts of glue during construction; 2. Poor wear resistance and short service life. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide an environmentally friendly prefabricated TPE plastic running track material and its preparation method. The obtained TPE plastic running track material does not require glue during construction. It only requires cement to bond the crushed stone layer to the road surface. It is easy to construct, safe and environmentally friendly, and has good wear resistance and long service life.

[0008] The technical problem to be solved by the present invention is achieved by the following technical solution:

[0009] One of the objectives of this invention is to provide an environmentally friendly prefabricated TPE plastic running track material, comprising a weather-resistant and wear-resistant embossed layer, an elastic support layer, an adhesive coating, and a gravel layer.

[0010] The elastic support layer is prepared from the following raw materials in parts by weight:

[0011]

[0012] The weather-resistant and wear-resistant embossed layer is prepared from the following raw materials in parts by weight:

[0013]

[0014]

[0015] The viscous coating is prepared from the following raw materials in parts by weight:

[0016] 100 copies of SIS / SBS / SEBS

[0017] 10-60 parts white oil

[0018] 50-150 parts of tackifying resin.

[0019] The second objective of this invention is to provide a method for preparing an environmentally friendly prefabricated TPE plastic running track material, comprising the following steps:

[0020] (1) Mix SEBS / SBS ​​with white oil evenly, then add POE, PP, filler, tackifying resin, antioxidant and light stabilizer, and plasticize and granulate through a twin-screw extruder to obtain elastic support material;

[0021] (2) After TPO, POE, SEBS, titanium dioxide, wear-resistant agent and filler are mixed evenly, they are plasticized and granulated by a twin-screw extruder. Antioxidant and light stabilizer are added by side feeding at the rear of the screw to obtain weather-resistant and wear-resistant embossed material.

[0022] (3) SIS / SBS / SEBS, white oil and tackifying resin are melted and mixed in a reactor to obtain a viscous material;

[0023] (4) The elastic support material, weather-resistant and wear-resistant embossed material, adhesive material and crushed stone prepared in steps (1)-(3) are processed into a prefabricated plastic track containing a weather-resistant and wear-resistant embossed layer, an elastic support layer, an adhesive coating and a crushed stone layer through a single screw extrusion production line.

[0024] In this invention, the weather-resistant and wear-resistant embossed layer has stable color and good aging resistance, weather resistance and anti-slip properties; the elastic support layer plays a decisive supporting role in the overall track's softness, comfort and resilience; the adhesive coating uses hot melt adhesive material, the main function of which is to bond the elastic support layer to the crushed stone; the crushed stone layer is bonded to cement during construction, solidifying the entire prefabricated plastic track on the cement ground.

[0025] The beneficial effects of this invention are:

[0026] 1. The environmentally friendly prefabricated TPE plastic running track material of the present invention does not use glue during construction. It only requires cement to bond the crushed stone layer to the road surface, which is easy to construct and has good safety and environmental protection.

[0027] 2. The environmentally friendly prefabricated TPE plastic running track material of the present invention adopts a layered design, which has good wear resistance and long service life, significantly improving the quality of use of plastic running tracks and extending their service life. Attached image description:

[0028] Figure 1 This is a schematic diagram of the processing production line for the prefabricated TPE plastic running track material described in this invention; wherein, 1-screw extruder; 2-screw extruder; 3-forming mold; 4-embossing roller machine; 5-cooling roller group; 6-adhesive coating; 7-crushed stone layer coating; 8-traction device; 9-cutting knife; 10-winding device. Detailed Implementation

[0029] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below with reference to specific embodiments.

[0030] This invention provides an environmentally friendly prefabricated TPE plastic running track material, comprising a weather-resistant and wear-resistant embossed layer, an elastic support layer, an adhesive coating, and a gravel layer.

[0031] The elastic support layer is prepared from the following raw materials in parts by weight:

[0032]

[0033] The weather-resistant and wear-resistant embossed layer is prepared from the following raw materials in parts by weight:

[0034]

[0035]

[0036] The viscous coating is prepared from the following raw materials in parts by weight:

[0037] 100 copies of SIS / SBS / SEBS

[0038] 10-60 parts white oil

[0039] 50-150 parts of tackifying resin.

[0040] This invention also provides another environmentally friendly prefabricated TPE plastic running track material, including a weather-resistant and wear-resistant embossed layer, an elastic support layer, an adhesive coating, and a gravel layer.

[0041] The elastic support layer is prepared from the following raw materials in parts by weight:

[0042]

[0043] The weather-resistant and wear-resistant embossed layer is prepared from the following raw materials in parts by weight:

[0044]

[0045] The viscous coating is prepared from the following raw materials in parts by weight:

[0046] 100 copies of SIS / STB

[0047] 10-60 parts white oil

[0048] 50-150 parts of tackifying resin.

[0049] SEBS is a linear triblock copolymer with polystyrene as the end block and ethylene-butene copolymer (obtained by hydrogenating polybutadiene) as the middle elastic block. It contains no unsaturated double bonds, thus exhibiting good stability and aging resistance. In the elastic support layer, the main function of SEBS is to provide elasticity to the plastic running track.

[0050] SBS is a triblock copolymer with styrene and butadiene as monomers, possessing characteristics of both plastics and rubber, and is known as "third-generation synthetic rubber." Similar to styrene-butadiene rubber (SBR), SBS can come into contact with water, weak acids, and alkalis, and exhibits excellent tensile strength, a high coefficient of surface friction, good low-temperature performance, excellent electrical properties, and good processability. In the elastic support layer, the main function of SBS is to provide elasticity for the plastic running track.

[0051] In this invention, SEBS / SBS ​​refers to either SEBS or SBS, or a mixture of SEBS and SBS.

[0052] POE, short for polyolefin elastomer, exhibits rubber-like elasticity at room temperature and is characterized by low density, high flexural strength, high low-temperature impact resistance, ease of processing, and reusability. In elastic support layers, the main function of POE is to increase the material's elasticity and improve its processing properties.

[0053] TPO is a thermoplastic elastomer material, typically made from a blend of polypropylene and polyethylene, with the addition of specific rubber elastomers and additives to improve its properties. TPO can exhibit the elasticity and flexibility of rubber at room temperature and can also be plasticized and molded at high temperatures. In weather-resistant and wear-resistant embossed layers, TPO serves as the main material, exhibiting good aging resistance, high strength, good flexibility, and excellent elasticity. POE primarily enhances the material's elasticity and improves its processability. SEBS primarily enhances the material's elasticity.

[0054] In a further technical solution, the STB is synthesized from styrene and trans-1-methoxy-3-(trimethylsiloxy)-1,3-butadiene in a mass ratio of 1:(1.2-1.5) through copolymerization, chain extension and hydrogenation under the initiation of n-butyllithium, with a number average molecular weight of 60,000-80,000 and a molecular weight distribution index of 1.1-1.2.

[0055] In a further technical solution, the white oil is a paraffin oil with a molecular weight of 300-1000. In the elastic support layer, the main function of the white oil is to adjust the hardness and softness of the material and improve its processing performance.

[0056] In a further technical solution, the PP is low melt flow index PP. PP is a polymer formed by the addition polymerization of propylene, belonging to a high-performance thermoplastic synthetic resin, possessing chemical resistance, heat resistance, electrical insulation, high mechanical strength, and good abrasion resistance. In the elastic support layer, the main function of PP is to adjust the hardness and softness of the material and improve its processing performance.

[0057] In further technical solutions, the tackifying resin includes, but is not limited to, one or more of C5 petroleum resin, C9 petroleum resin, rosin resin, and terpene resin. The main function of the tackifying resin is to improve the adhesion properties of the material.

[0058] In further technical solutions, the filler includes, but is not limited to, one or more of calcium carbonate, barium sulfate, talc, wollastonite, silica, kaolin, diatomaceous earth, and mica powder; commonly used fillers in the art can be used. The addition of fillers can not only reduce the amount of polymer used and lower the production cost of the material, but also improve the processing performance and mechanical strength of the material.

[0059] In further technical solutions, the antioxidant includes, but is not limited to, one or more of hindered phenolic antioxidants, phosphite antioxidants, and amine antioxidants. The main function of antioxidants is to improve the aging resistance of materials and extend their service life.

[0060] In a further technical solution, the light stabilizer includes, but is not limited to, one or more of UV944, UV531, UV327, UV770, UV774, UV662, and UV-P. The function of the light stabilizer is to improve the processing stability and aging resistance of the material.

[0061] In a further technical solution, the titanium dioxide is rutile titanium dioxide. The addition of titanium dioxide can provide a base color to the material and improve its aging resistance.

[0062] In further technical solutions, the wear-resistant agent includes, but is not limited to, one or more of silicon nitride, boron nitride, silicone oil, silicone masterbatch, silica, PTFE powder, and ultra-high molecular weight polyethylene micro powder. The main function of the wear-resistant agent is to improve the wear resistance of the material and extend the service life of the running track.

[0063] In adhesive coatings, SIS / SBS / SEBS is used as the main material. Any one of SIS, SBS, and SEBS can be used, as well as a mixture of any two of them, or a mixture of SIS, SBS, and SEBS. SIS is a styrene-isoprene-styrene block copolymer, possessing excellent corrugated sealing properties and high-temperature retention. Its unique microstructure determines its superior performance as an adhesive.

[0064] The crushed stone layer uses common small-diameter crushed stone particles, requiring good particle uniformity and good adhesion strength to cement.

[0065] This invention also provides a method for preparing an environmentally friendly prefabricated TPE plastic running track material, comprising the following steps:

[0066] (1) Mix SEBS / SBS ​​with white oil evenly, then add POE, PP, filler, tackifying resin, antioxidant and light stabilizer, and plasticize and granulate through a twin-screw extruder to obtain elastic support material;

[0067] (2) After TPO, POE, SEBS, titanium dioxide, wear-resistant agent and filler are mixed evenly, they are plasticized and granulated by a twin-screw extruder. Antioxidant and light stabilizer are added by side feeding at the rear of the screw to obtain weather-resistant and wear-resistant embossed material.

[0068] (3) SIS / SBS / SEBS, white oil and tackifying resin are melted and mixed in a reactor to obtain a viscous material;

[0069] (4) The elastic support material, weather-resistant and wear-resistant embossed material, adhesive material and crushed stone prepared in steps (1)-(3) are processed into a prefabricated plastic track containing a weather-resistant and wear-resistant embossed layer, an elastic support layer, an adhesive coating and a crushed stone layer through a single screw extrusion production line.

[0070] This invention also provides another method for preparing an environmentally friendly prefabricated TPE plastic running track material, comprising the following steps:

[0071] (1) Mix STB with white oil evenly, then add POE, PP, filler, tackifying resin, antioxidant and light stabilizer, and plasticize and granulate through a twin-screw extruder to obtain elastic support material;

[0072] (2) After TPO, POE, STB, titanium dioxide, wear-resistant agent and filler are mixed evenly, they are plasticized and granulated by twin-screw extruder. Antioxidant and light stabilizer are added by side feeding at the rear of the screw to obtain weather-resistant and wear-resistant embossed material.

[0073] (3) SIS / STB, white oil and tackifying resin are melt-mixed in a reactor to obtain a viscous material;

[0074] (4) The elastic support material, weather-resistant and wear-resistant embossed material, adhesive material and crushed stone prepared in steps (1)-(3) are processed into a prefabricated plastic track containing a weather-resistant and wear-resistant embossed layer, an elastic support layer, an adhesive coating and a crushed stone layer through a single screw extrusion production line.

[0075] The performance of the prefabricated running track of the present invention was compared with that of traditional rubber running tracks and other prefabricated running tracks. The comparison results are shown in Table 1.

[0076] Table 1

[0077]

[0078]

[0079] The following examples illustrate the source of raw materials:

[0080] SEBS was purchased from Asahi Kasei Corporation of Japan; the model number is P1500.

[0081] The POE was purchased from Dow Chemical in the United States, and the models are 8200 and 8150.

[0082] The PP was purchased from Yangzi Petrochemical, and its model is PPF401.

[0083] The SBS was purchased from Sinopec Maoming, model F875.

[0084] The TPO was purchased from LyondellBasell, model CA7700A.

[0085] The SIS was purchased from Kraton in the United States, model number D1113BT.

[0086] C5 petroleum resin was purchased from Henan Xinquan Chemical Technology Co., Ltd.

[0087] C9 petroleum resin was purchased from Hebei Zhongqiao New Materials Co., Ltd.

[0088] The terpene resin was purchased from Shandong Defeng Industry and Trade Co., Ltd.

[0089] The paraffin oil was purchased from Wuxi Yongzhen Industrial Oil Products Co., Ltd., model KP6030, with a flash point of 280℃. The rutile titanium dioxide was purchased from Henan Tianchou Chemical Products Co., Ltd.

[0090] The crushed stone is limestone crushed stone with a particle size of 5-10mm.

[0091] Talc powder, 325 mesh, was purchased from Hebei Qingjiang New Material Technology Co., Ltd.

[0092] The silica was purchased from Jinan Delan Chemical Co., Ltd., and the model number is DL-6150.

[0093] The silica was purchased from Jinan Baoliyuan Chemical Co., Ltd.

[0094] PTFE powder was purchased from Guangzhou Songbai Chemical Co., Ltd.

[0095] Example 1

[0096] Table 2

[0097]

[0098]

[0099] The preparation method of the prefabricated TPE plastic running track material in this embodiment includes the following steps:

[0100] (1) Mix SEBS, SBS and white oil evenly according to the weight ratio in Table 2, then add POE, PP, filler, tackifying resin, antioxidant and light stabilizer, and plasticize and granulate through a twin-screw extruder at 170-220℃ to obtain elastic support material.

[0101] (2) TPO, POE, SEBS, titanium dioxide, wear-resistant agent and filler are mixed evenly according to the weight ratio in Table 2 and then plasticized and granulated by a twin-screw extruder at 170-220℃. Antioxidant and light stabilizer are added by side feeding at the rear of the screw to obtain weather-resistant and wear-resistant embossed material.

[0102] (3) SIS, SBS, SEBS, white oil and tackifying resin are melted and mixed in a reactor according to the weight ratio in Table 2 to obtain a viscous material.

[0103] (4) The elastic support material, weather-resistant and wear-resistant embossed material, adhesive material and crushed stone prepared in steps (1)-(3) are processed into a prefabricated plastic track containing a weather-resistant and wear-resistant embossed layer, an elastic support layer, an adhesive coating and a crushed stone layer through a single screw extrusion production line.

[0104] Example 2

[0105] The preparation method of the prefabricated TPE plastic running track material in this embodiment is the same as that in Embodiment 1, except that the raw material formula is changed, as shown in Table 3.

[0106] Table 3

[0107]

[0108]

[0109] Example 3

[0110] The preparation method of the prefabricated TPE plastic running track material in this embodiment is the same as that in Example 1, except that the raw material formula is changed, as shown in Table 4.

[0111] Table 4

[0112]

[0113] Example 4

[0114] In this embodiment, the preparation method of the prefabricated TPE plastic running track material is the same as in Example 3, except that SEBS and SBS are all replaced with STB.

[0115] Preparation of STB: 120g of styrene and 300g of trans-1-methoxy-3-(trimethylsiloxy)-1,3-butadiene were dissolved in n-hexane. 1g of n-butyllithium was added for copolymerization (reaction temperature 60℃, reaction time 30min). Then, 80g of styrene was added for chain extension (reaction temperature 80℃, reaction time 30min). Then, 1g of dichlorodicyclopentadiene was added for hydrogenation (reaction pressure 3MPa, reaction temperature 80℃, reaction time 2h). After the reaction, n-hexane was recovered by vacuum distillation, vacuum drying, and pulverization to obtain a styrene-based block copolymer with a number average molecular weight of 80,000 and a molecular weight distribution index of 1.12.

[0116] Example 5

[0117] In this embodiment, the preparation method of the prefabricated TPE plastic running track material is the same as in Example 3, except that SEBS and SBS are all replaced with STB.

[0118] Preparation of STB: 150g of styrene and 240g of trans-1-methoxy-3-(trimethylsiloxy)-1,3-butadiene were dissolved in n-hexane. 1g of n-butyllithium was added for copolymerization (reaction temperature 60℃, reaction time 30min). Then, 50g of styrene was added for chain extension (reaction temperature 80℃, reaction time 30min). Then, 1g of dichlorodicyclopentadiene was added for hydrogenation (reaction pressure 3MPa, reaction temperature 80℃, reaction time 2h). After the reaction, n-hexane was recovered by vacuum distillation, vacuum drying, and pulverization to obtain a styrene-based block copolymer with a number average molecular weight of 60,000 and a molecular weight distribution index of 1.15.

[0119] The durability of the plastic running track material prepared in the above embodiments was tested according to GB / T 14833-2020 "Synthetic Materials for Sports Field Surface Layers", and the results are shown in Table 5.

[0120] Table 5

[0121]

[0122]

[0123] As can be seen from Table 5, compared with SEBS and SBS, the addition of STB to the weather-resistant and wear-resistant embossed layer, elastic support layer, and adhesive coating is more conducive to improving the durability of plastic running track materials.

[0124] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. An environmentally friendly prefabricated TPE plastic running track material, characterized in that: It includes a weather-resistant and wear-resistant embossed layer, an elastic support layer, an adhesive coating, and a gravel layer; The elastic support layer is prepared from the following raw materials in parts by weight: STB 100 copies 80-120 parts white oil POE 10-25 copies PP 0~10 parts 10-50 parts of filler 0-10 parts of tackifying resin Antioxidant 0.1~0.5 parts Light stabilizer 0.1~0.5 parts; The weather-resistant and wear-resistant embossed layer is prepared from the following raw materials in parts by weight: TPO 100 servings POE 5-30 copies STB 10~30 servings 3-8 parts of titanium dioxide 3-8 parts of wear-resistant agent 5-15 parts of filler Antioxidant 0.5~1.5 parts 0.5 to 1.5 parts of light stabilizer; The viscous coating is prepared from the following raw materials in parts by weight: 100 copies of SIS / STB 10-60 parts white oil 50-150 parts of tackifying resin; The STB is synthesized from styrene and trans-1-methoxy-3-(trimethylsiloxy)-1,3-butadiene in a mass ratio of 1:(1.2-1.5) via copolymerization, chain extension and hydrogenation under the initiation of n-butyllithium. The number average molecular weight is 60,000-80,000 and the molecular weight distribution index is 1.1-1.

2.

2. The environmentally friendly prefabricated TPE plastic running track material according to claim 1, characterized in that: The PP mentioned is low melt flow index PP.

3. The environmentally friendly prefabricated TPE plastic running track material according to claim 1, characterized in that: The titanium dioxide is rutile titanium dioxide.

4. The environmentally friendly prefabricated TPE plastic running track material according to claim 1, characterized in that: The wear-resistant agent is selected from one or more of silicon nitride, boron nitride, silicone oil, silicone masterbatch, silicon dioxide, PTFE powder, and ultra-high molecular weight polyethylene micro powder.

5. The environmentally friendly prefabricated TPE plastic running track material according to claim 1, characterized in that: The filler is selected from one or more of calcium carbonate, barium sulfate, talc, wollastonite, silica, kaolin, diatomite, and mica powder.

6. The environmentally friendly prefabricated TPE plastic running track material according to claim 1, characterized in that: The antioxidant is selected from one or more of hindered phenolic antioxidants, phosphite antioxidants, and amine antioxidants.

7. The environmentally friendly prefabricated TPE plastic running track material according to claim 1, characterized in that: The light stabilizer is selected from one or more of UV944, UV531, UV327, UV770, UV774, UV662, and UV-P.

8. The environmentally friendly prefabricated TPE plastic running track material according to claim 1, characterized in that: The white oil is a paraffin oil with a molecular weight of 300-1000.

9. The environmentally friendly prefabricated TPE plastic running track material according to claim 1, characterized in that: The tackifying resin is selected from one or more of C5 petroleum resin, C9 petroleum resin, rosin resin, and terpene resin.

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