Recovery and regeneration method of sports floor and sports floor prepared from regenerated material

Abstract

The invention relates to a method for recycling polypropylene sports floors, which comprises the following steps: (1) crushing polypropylene sports floor reclaimed materials into fragments of 2-5mm by a crusher, cleaning and rinsing, and drying until the water content is 1t; 0.03% by weight; (2) premixing: mixing 100 parts by weight of the PP reclaimed material, 4-6 parts by weight of an SAG grafting agent, 7-9 parts by weight of an OBC toughening agent, 1.5-2.5 parts by weight of an HBP dispersing agent, 1.2-1.8 parts by weight of a compound stabilizer and 0.1-0.2 part by weight of a beta crystal nucleating agent at room temperature for 5-8 min; and (3) extrusion and granulation: carrying out melt blending, extrusion, cooling and grain-sized dicing on the pre-mixed material to obtain the polypropylene regenerated material. The invention further relates to a multi-layer composite sports floor and an assembled floor which are prepared from the polypropylene reclaimed material. Waste materials are successfully converted into high-performance products, and high unification of environmental benefits, technical benefits and economic benefits is achieved.

Description

Technical Field

[0001] This invention relates to a method for recycling and regenerating sports flooring and sports flooring made from recycled materials. Background Technology

[0002] Modular sports flooring, also known as interlocking flooring, is a modular sports mat made primarily of polypropylene (PP) or modified polypropylene. It uses interlocking connections for quick assembly and features a suspended structure design. Initially used in five-a-side football fields, it has since expanded to basketball courts, tennis courts, and other sports venues. Its bird's nest-patterned perforated surface prevents water accumulation, and its vertical cushioning structure ensures a 96% ball rebound rate. Its anti-slip and shock-absorbing properties meet the demands of various sports activities.

[0003] With the upgrading of venues and wear and tear, the amount of waste interlocking flooring is constantly increasing. However, recycled polypropylene interlocking flooring suffers from problems such as broken molecular chains, poor toughness, and loss of weather resistance. Traditional recycling methods either rely on complex pretreatment or simply compensate for performance through blending, resulting in uneven performance and low added value of recycled materials, making them difficult to reuse in the demanding sports flooring industry. Furthermore, recycled materials often result in products with poor appearance and insufficient surface properties. Summary of the Invention

[0004] The purpose of this invention is to provide a low-cost, high-performance method for recycling materials and sports flooring made from recycled materials.

[0005] The present invention adopts the following technical solution: A method for recycling and regenerating polypropylene sports flooring includes the following steps: (1) The recycled polypropylene sports flooring material is crushed into 2-5mm fragments by a crusher, washed and rinsed, and then dried to a moisture content of <0.03%; (2) Premixing: Mix 100 parts by weight of recycled PP material, 4-6 parts by weight of SAG grafting agent, 7-9 parts by weight of OBC toughening agent, 1.5-2.5 parts by weight of HBP dispersant, 1.2-1.8 parts by weight of composite stabilizer, and 0.1-0.2 parts by weight of β crystal nucleating agent at room temperature for 5-8 minutes. (3) Extrusion granulation: The premixed material is melt-blended, extruded, cooled and granulated to obtain recycled polypropylene.

[0006] Furthermore, the SAG grafting agent is a styrene-acrylonitrile-glycidyl methacrylate terpolymer.

[0007] Furthermore, the OBC toughening agent is an ethylene-octene multiblock copolymer.

[0008] Furthermore, the HBP dispersant is a hyperbranched polyester.

[0009] Furthermore, the composite stabilizer includes 0.4 to 0.6 parts by weight of antioxidant 1010 and 0.8 to 1.2 parts by weight of antioxidant 168.

[0010] Furthermore, in step (3), reactive extrusion granulation is performed using a co-rotating twin-screw extruder; the temperature settings are: zone 1 160~170℃, zone 2 175~185℃, zone 3 185~195℃, zone 4 195~205℃, zone 5 190~200℃, zone 6 185~195℃; the screw speed is 300~400rpm; vacuum exhaust is performed after zone 4, and the vacuum degree is ≥ -0.08 MPa.

[0011] A multi-layer composite sports floor made from recycled polypropylene material prepared using the above-mentioned method for recycling polypropylene sports flooring includes a core layer composed of recycled polypropylene material and a surface layer composited on the upper and lower surfaces of the core layer; the surface layer material is a modified polypropylene material.

[0012] In the multi-layer composite sports floor, the modified polypropylene material comprises 100 parts by weight of homopolymer PP, 5 parts by weight of polysiloxane masterbatch, and 0.5 parts by weight of UV-326.

[0013] In the multi-layer composite sports floor, recycled polypropylene and modified polypropylene materials are prepared by co-injection molding.

[0014] An interlocking floor made from recycled polypropylene material prepared using the above-mentioned method for recycling polypropylene sports flooring includes a surface layer and a support layer disposed below the surface layer. The surface layer is made of modified polypropylene material, and the support layer is made of recycled polypropylene material.

[0015] In the assembled floor, a support column is provided below the support layer. The surface layer and the support layer are connected by a snap-fit ​​structure. The snap-fit ​​structure includes a buckle on the top surface of the support layer and a slot on the bottom surface of the surface layer. The slot is arranged in a rectangular array on the bottom surface of the surface layer and is located near the edge of the surface layer. The position of the buckle corresponds to the position of the slot.

[0016] In the assembled floor, the buckle includes a vertical post set on the surface of the support layer and a snap-fit ​​protrusion set on one side of the top of the post, and the slot includes a channel for the buckle to pass through and a snap-fit ​​groove set on the side wall of the channel.

[0017] In the assembled floor, the snap-fit ​​protrusion is wedge-shaped and located on the inside of the upright.

[0018] In the assembled floor, an elastic steel sheet is provided on the inner side of the upright.

[0019] In the assembled floor, the elastic steel sheet is T-shaped, with its horizontal side embedded in the support layer and its vertical side located in the column.

[0020] In the assembled floor, a horizontal ratchet is provided on the bottom surface of the outwardly protruding snap-fit ​​protrusion, and a limiting groove is provided on the bottom surface of the snap-fit ​​groove to cooperate with it.

[0021] In the assembled floor, an open groove is provided at the opening position of the channel, and the position of the open groove corresponds to the position of the snap-fit ​​protrusion.

[0022] In the assembled floor, a slot communicating with a channel is provided on the surface layer. The upper end of the slot is located on the top surface of the surface layer, and the lower end is communicating with the channel.

[0023] In the assembled floor, four surface layers are evenly provided above each support layer, and adjacent surface layers are connected by clips.

[0024] In the assembled floor, positioning posts and positioning grooves are provided at diagonal positions between the surface layer and the support layer.

[0025] The beneficial effects of this invention are as follows: First, this invention achieves high-value-added closed-loop recycling of waste polypropylene interlocking flooring, increasing the proportion of recycled materials to 70%~95% of the core layer, thereby reducing solid waste and environmental pollution.

[0026] Secondly, this invention solves the problem of molecular chain breakage caused by aging in recycled polypropylene materials through a SAG / OBC / HBP synergistic repair and toughening system, significantly improving the material's impact strength and melt strength while maintaining excellent toughness. The resulting sports interlocking flooring approaches the standards of commercially available virgin materials in key performance indicators such as ball rebound rate, abrasion resistance, and impact resistance.

[0027] Third, the core raw material of this invention uses low-cost recycled materials, combined with an efficient modified formula, which significantly reduces production costs. The "virgin material skin - recycled material core layer" composite structure constructed through co-injection molding combines the economic benefits of recycled materials with the high surface performance of virgin materials.

[0028] Fourth, the surface layer and support layer of the modular flooring of the present invention are modularly designed and are detachably connected by a snap-fit ​​structure. When the surface layer or support layer is partially damaged, it can be directly replaced individually without replacing the whole piece. The support layer is made of recycled material, which can effectively solve the problem of high maintenance costs in the later stage in the prior art.

[0029] In summary, this invention successfully transforms waste materials into high-performance products, achieving a high degree of unity between environmental, technological, and economic benefits. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the assembled floor structure of the present invention.

[0031] Figure 2 This is a schematic diagram of the snap-fit ​​structure of the assembled flooring of the present invention.

[0032] Figure 3 This is a schematic diagram of the snap-fit ​​structure of the interlocking floor of the present invention.

[0033] Figure 4 This is a schematic diagram of the slot structure of the assembled floor of the present invention.

[0034] Figure 5 This is a schematic diagram of the surface layer arrangement of the assembled flooring of the present invention. Detailed Implementation

[0035] The technical solution of the present invention will be further described in detail and completely through specific embodiments below.

[0036] Example 1 1. Preparation of recycled PP material: (1) Pretreatment of PP recycled material: PP recycled material is crushed into 2~5mm fragments by a crusher, then washed with 80℃ hot water (containing 1% neutral detergent) for 15min by stirring, rinsed with clean water, and then dried in a 100℃ hot air circulating oven for 4 hours until the moisture content is <0.03%.

[0037] (2) Premixing: Add each component into a high-speed mixer (SHR-100A type) in proportion and mix for 5 to 8 minutes at room temperature with a speed of 800 to 1000 rpm until each component evenly coats the recycled material particles.

[0038] The proportions of each component are as follows: 100kg of recycled PP, 4kg of SAG grafting agent (styrene-acrylonitrile-glycidyl methacrylate terpolymer, epoxy value 0.05~0.10), 7kg of OBC toughening agent (ethylene-octene multiblock copolymer, DowChemical-INFUSE™), 1.5kg of HBP dispersant (hyperbranched polyester, Boltorn™ series, hydroxyl value 450 mg KOH / g), 0.5kg of composite stabilizer (antioxidant 1010 0.5kg, antioxidant 168 1.0kg), and 0.1kg of β crystal nucleating agent (quinacridone, TMB-5).

[0039] (3) Reactive extrusion granulation: Pour the premixed material into a co-rotating twin-screw extruder and perform melt blending, extrusion, cooling and pelletizing according to the following parameters.

[0040] Temperature settings: Zone 1 (feeding): 165℃, Zone 2 (melting): 180℃, Zone 3 (melting): 190℃, Zone 4 (reaction zone): 200℃, Zone 5 (homogenization): 195℃, Zone 6 (die head): 190℃.

[0041] Screw speed: 350 rpm; Vacuum exhaust (located after the fourth zone): Vacuum degree ≥ -0.08 MPa.

[0042] After granulation, dry in an oven at 80℃ for 4 hours for later use.

[0043] 2. Preparation of multi-layer composite flooring (1) Raw materials Core layer: PP recycled material prepared in this embodiment.

[0044] Surface layer: 100kg of brand new homopolymer PP (T30S), 5kg of wear-resistant masterbatch (polysiloxane masterbatch), 0.5kg of UV-326, and 2kg of blue masterbatch.

[0045] (2) Co-injection process parameters Two-platen co-injection molding machine (Haitian MA series) is used for co-injection molding.

[0046] Core layer barrel temperature: 190℃-200℃-205℃-195℃ (from back to front). Surface layer barrel temperature: 200℃-210℃-215℃-205℃ (from back to front).

[0047] Injection parameters: Step 1: Inject the surface layer material. Injection volume: 35g (approximately 10% of the total product weight); Injection speed: Medium (50% speed setting); Switching method: Controlled by injection volume. Step 2: Inject the core layer material. Injection speed: High (80% speed setting); Injection pressure: 85 MPa; Holding pressure: 55 MPa; Holding time: 15s.

[0048] The mold temperature is set to 45℃, the cooling time is 35s, and the total cycle time is 60s.

[0049] (3) Post-processing: After demolding, trim the sprue. The final product has a three-layer structure with an upper and lower surface layer thickness of about 0.5 mm, a core layer thickness of about 12 mm, and a total thickness of about 22 mm.

[0050] Example 2 1. Preparation of recycled PP material: (1) Pretreatment of PP recycled material: PP recycled material is crushed into 2~5mm fragments by a crusher, then washed with 80℃ hot water (containing 1% neutral detergent) for 15min by stirring, rinsed with clean water, and then dried in a 100℃ hot air circulating oven for 4 hours until the moisture content is <0.03%.

[0051] (2) Premixing: Add each component into a high-speed mixer (SHR-100A type) in proportion and mix for 5 to 8 minutes at room temperature with a speed of 800 to 1000 rpm until each component evenly coats the recycled material particles.

[0052] The proportions of each component are as follows: 100kg of recycled PP, 6kg of SAG grafting agent (styrene-acrylonitrile-glycidyl methacrylate terpolymer, epoxy value 0.05~0.10), 9kg of OBC toughening agent (ethylene-octene multiblock copolymer, DowChemical-INFUSE™), 2.5kg of HBP dispersant (hyperbranched polyester, Boltorn™ series, hydroxyl value 450 mg KOH / g), 0.5kg of composite stabilizer (antioxidant 1010 0.5kg, antioxidant 168 1.0kg), and 0.1kg of β crystal nucleating agent (quinacridone, TMB-5).

[0053] (3) Reactive extrusion granulation: Pour the premixed material into a co-rotating twin-screw extruder and perform melt blending, extrusion, cooling and pelletizing according to the following parameters.

[0054] Temperature settings: Zone 1 (feeding): 165℃, Zone 2 (melting): 180℃, Zone 3 (melting): 190℃, Zone 4 (reaction zone): 200℃, Zone 5 (homogenization): 195℃, Zone 6 (die head): 190℃.

[0055] Screw speed: 350 rpm; Vacuum exhaust (located after the fourth zone): Vacuum degree ≥ -0.08 MPa.

[0056] After granulation, dry in an oven at 80℃ for 4 hours for later use.

[0057] 2. Preparation of multi-layer composite flooring (1) Raw materials Core layer: PP recycled material prepared in this embodiment.

[0058] Surface layer: 100kg of brand new homopolymer PP (T30S), 5kg of wear-resistant masterbatch (polysiloxane masterbatch), 0.5kg of UV-326, and 2kg of blue masterbatch.

[0059] (2) Co-injection process parameters Two-platen co-injection molding machine (Haitian MA series) is used for co-injection molding.

[0060] Core layer barrel temperature: 190℃-200℃-205℃-195℃ (from back to front). Surface layer barrel temperature: 200℃-210℃-215℃-205℃ (from back to front).

[0061] Injection parameters: Step 1: Inject the surface layer material. Injection volume: 35g (approximately 10% of the total product weight); Injection speed: Medium (50% speed setting); Switching method: Controlled by injection volume. Step 2: Inject the core layer material. Injection speed: High (80% speed setting); Injection pressure: 85 MPa; Holding pressure: 55 MPa; Holding time: 15s.

[0062] The mold temperature is set to 45℃, the cooling time is 35s, and the total cycle time is 60s.

[0063] (3) Post-processing: After demolding, trim the sprue. The final product has a three-layer structure with an upper and lower surface layer thickness of about 0.5 mm, a core layer thickness of about 12 mm, and a total thickness of 22 mm.

[0064] Example 3 1. Preparation of recycled PP material: (1) Pretreatment of PP recycled material: PP recycled material is crushed into 2~5mm fragments by a crusher, then washed with 80℃ hot water (containing 1% neutral detergent) for 15min by stirring, rinsed with clean water, and then dried in a 100℃ hot air circulating oven for 4 hours until the moisture content is <0.03%.

[0065] (2) Premixing: Add each component into a high-speed mixer (SHR-100A type) in proportion and mix for 5 to 8 minutes at room temperature with a speed of 800 to 1000 rpm until each component evenly coats the recycled material particles.

[0066] The proportions of each component are as follows: 100kg of recycled PP, 5kg of SAG grafting agent (styrene-acrylonitrile-glycidyl methacrylate terpolymer, epoxy value 0.05~0.10), 8kg of OBC toughening agent (ethylene-octene multiblock copolymer, DowChemical-INFUSE™), 2.0kg of HBP dispersant (hyperbranched polyester, Boltorn™ series, hydroxyl value 450 mg KOH / g), 0.5kg of composite stabilizer (antioxidant 1010 0.5kg, antioxidant 168 1.0kg), and 0.1kg of β crystal nucleating agent (quinacridone, TMB-5).

[0067] (3) Reactive extrusion granulation: Pour the premixed material into a co-rotating twin-screw extruder and perform melt blending, extrusion, cooling and pelletizing according to the following parameters.

[0068] Temperature settings: Zone 1 (feeding): 165℃, Zone 2 (melting): 180℃, Zone 3 (melting): 190℃, Zone 4 (reaction zone): 200℃, Zone 5 (homogenization): 195℃, Zone 6 (die head): 190℃.

[0069] Screw speed: 350 rpm; Vacuum exhaust (located after the fourth zone): Vacuum degree ≥ -0.08 MPa.

[0070] After granulation, dry in an oven at 80℃ for 4 hours for later use.

[0071] 2. Preparation of multi-layer composite flooring (1) Raw materials Core layer: PP recycled material prepared in this embodiment.

[0072] Surface layer: 100kg of brand new homopolymer PP (T30S), 5kg of wear-resistant masterbatch (polysiloxane masterbatch), 0.5kg of UV-326, and 2kg of blue masterbatch.

[0073] (2) Co-injection process parameters Two-platen co-injection molding machine (Haitian MA series) is used for co-injection molding.

[0074] Core layer barrel temperature: 190℃-200℃-205℃-195℃ (from back to front). Surface layer barrel temperature: 200℃-210℃-215℃-205℃ (from back to front).

[0075] Injection parameters: Step 1: Inject the surface layer material. Injection volume: 35g (approximately 10% of the total product weight); Injection speed: Medium (50% speed setting); Switching method: Controlled by injection volume. Step 2: Inject the core layer material. Injection speed: High (80% speed setting); Injection pressure: 85 MPa; Holding pressure: 55 MPa; Holding time: 15s.

[0076] The mold temperature is set to 45℃, the cooling time is 35s, and the total cycle time is 60s.

[0077] (3) Post-processing: After demolding, trim the sprue. The final product has a three-layer structure with an upper and lower surface layer thickness of about 0.5 mm, a core layer thickness of about 12 mm, and a total thickness of about 22 mm.

[0078] Comparative Example 1 Preparation of recycled PP materials: (1) Pretreatment of recycled PP material: Same as in Example 2.

[0079] (2) Premixing: Add each component into a high-speed mixer (SHR-100A type) in proportion and mix for 5 to 8 minutes at room temperature with a speed of 800 to 1000 rpm until each component evenly coats the recycled material particles.

[0080] The proportions of each component are as follows: Same as in Example 2, except that it does not contain SAG grafting agent.

[0081] (3) Reactive extrusion granulation: Same as in Example 2.

[0082] Comparative Example 2 Preparation of recycled PP materials: (1) Pretreatment of recycled PP material: Same as in Example 2.

[0083] (2) Premixing: Add each component into a high-speed mixer (SHR-100A type) in proportion and mix for 5 to 8 minutes at room temperature with a speed of 800 to 1000 rpm until each component evenly coats the recycled material particles.

[0084] The proportions of each component are as follows: Same as in Example 2, except that OBC is replaced with POE, and SAG and HBP are not included.

[0085] (3) Reactive extrusion granulation: Same as in Example 2.

[0086] Comparative Example 3 Preparation of multi-layer composite flooring: Same as Example 1, except that the core layer is prepared using recycled PP material obtained in Comparative Example 1.

[0087] Comparative Example 4 Using 100% new materials, namely the surface layer formulation in Example 1, a brand new sports floor with a thickness of 22mm was prepared using a conventional single injection molding process.

[0088] Example of effect 1 The performance of the PP recycled materials prepared in Examples 1-3 and Comparative Examples 1-2 was tested, and the results are shown in Table 1.

[0089] Table 1 Performance Tests of Recycled PP .

[0090] The results showed that the melt flow rates of Examples 1-3 were significantly lower than those of the comparative example, indicating that the chain extension and repair of SAG played a positive role and effectively increased the molecular weight. The impact strength and flexural modulus of Examples 1-3 were significantly improved, and the rigidity was greatly enhanced while maintaining toughness.

[0091] Example 2 The performance of the composite multilayer sports flooring prepared in Examples 1-3 and Comparative Examples 3-4 was tested, and the results are shown in Table 2.

[0092] Table 2 Performance Tests of Sports Flooring .

[0093] Table 2 shows that all flooring using the recycled material of this invention as the core layer meets the performance requirements of sports flooring in terms of key properties (ball rebound rate, abrasion resistance, and impact resistance) and is close to the performance level of 100% new material products. This proves that its core performance is excellent and can be reliably applied to sports occasions with high performance requirements, realizing the closed-loop high-value utilization of waste PP interlocking flooring.

[0094] Example 4 As attached Figure 1-5 As shown, an environmentally friendly, detachable sports floor includes a modularly designed surface layer 1 and a support layer 2, with several support columns 3 located beneath the support layer 2. The surface layer is made of modified polypropylene, and the support layer uses recycled polypropylene material prepared as described in Examples 1-3. The surface layer 1 and support layer 2 are detachably connected via a snap-fit ​​structure, allowing for individual replacement of either the surface layer 1 or the support layer 2 if either part is damaged. The use of recycled polypropylene material in the support layer further reduces production and maintenance costs.

[0095] The snap-fit ​​structure includes a slot on the bottom surface of the surface layer 1 and a buckle on the top surface of the support layer 2. The buckles are arranged in a rectangular array on the bottom surface of the surface layer 1 and are located near the edge of the surface layer 1.

[0096] Specifically, the latch includes a vertically mounted post 5 on the surface of the support layer 2 and a latching protrusion 6 located on the inner side of the top of the post 5. The latching protrusion 6 is wedge-shaped with a flat bottom surface and a horizontal ratchet 7 on the flat surface. The latching groove includes a channel 4 for the latch to pass through and a latching groove 9 located on the side wall of the channel 4. After passing through the channel 4, the latching protrusion engages with the latching groove 9 to achieve latching. A limiting groove 10 is provided on the bottom surface of the latching groove 9 to engage with the horizontal ratchet 7. When the latching protrusion 6 engages with the latching groove 9, the horizontal ratchet 7 also engages with the limiting groove 10 to achieve further limiting and prevent the latching structure from disengaging during vigorous activity.

[0097] Preferably, a T-shaped elastic steel sheet 8 is embedded in the support layer 2, with its horizontal side located inside the support layer 2 and its vertical side extending upward and located inside the column 5, so as to improve the durability of the column 5.

[0098] To improve ease of connection, positioning posts 12 and positioning grooves are provided at diagonal positions between the surface layer 1 and the support layer 2. Furthermore, an open slot 11 is provided at the opening of the channel 4, its position corresponding to the position of the snap-fit ​​protrusion 6, to increase the opening size of the channel 4.

[0099] To facilitate disassembly, a slot 14 is provided between the top surface of channel 4 and the surface of surface layer 1. The lower end of slot 14 corresponds to the position of the snap-fit ​​protrusion 6. When disassembly is difficult, a screwdriver or other tool can be inserted into slot 14 from above surface layer 1 and the column 5 can be pushed outward to disengage the snap-fit ​​protrusion 6 from the snap-fit ​​groove 9. At the same time, slot 14 can also serve as a drainage channel.

[0100] Preferably, each support layer 2 has four surface layers 1 on top, which are evenly distributed on the surface of the support layer 2. Adjacent surface layers 1 are connected by clips 13, and adjacent support layers 2 are also connected by clips 13 during installation. The structure of the clips is the same as that of existing interlocking flooring, and will not be described in detail here. In this way, more surface layers 1 can be laid in the same area, with more color variations, which helps to form more surface patterns and make it more aesthetically pleasing.

Claims

1. A method for recycling and regenerating polypropylene sports flooring, characterized in that, It includes the following steps: (1) The recycled polypropylene sports flooring material is crushed into 2-5mm fragments by a crusher, washed and rinsed, and then dried to a moisture content of <0.03%; (2) Premixing: Mix 100 parts by weight of recycled PP material, 4-6 parts by weight of SAG grafting agent, 7-9 parts by weight of OBC toughening agent, 1.5-2.5 parts by weight of HBP dispersant, 1.2-1.8 parts by weight of composite stabilizer, and 0.1-0.2 parts by weight of β crystal nucleating agent at room temperature for 5-8 minutes. (3) Extrusion granulation: The premixed material is melt-blended, extruded, cooled and granulated to obtain recycled polypropylene.

2. The method for recycling and regenerating polypropylene sports flooring according to claim 1, characterized in that, The SAG grafting agent is a styrene-acrylonitrile-glycidyl methacrylate terpolymer.

3. The method for recycling and regenerating polypropylene sports flooring according to claim 1, characterized in that, The OBC toughening agent is an ethylene-octene multiblock copolymer.

4. The method for recycling and regenerating polypropylene sports flooring according to claim 1, characterized in that, The HBP dispersant is a hyperbranched polyester.

5. The method for recycling and regenerating polypropylene sports flooring according to claim 1, characterized in that, The composite stabilizer includes 0.4 to 0.6 parts by weight of antioxidant 1010 and 0.8 to 1.2 parts by weight of antioxidant 168.

6. The method for recycling and regenerating polypropylene sports flooring according to claim 1, characterized in that, Step (3) Reactive extrusion granulation is carried out using a co-rotating twin-screw extruder; the temperature settings are: Zone 1 160~170℃, Zone 2 175~185℃, Zone 3 185~195℃, Zone 4 195~205℃, Zone 5 190~200℃, Zone 6 185~195℃; the screw speed is 300~400rpm; vacuum exhaust is performed after Zone 4, and the vacuum degree is ≥ -0.08 MPa.

7. A multi-layer composite sports floor made from recycled polypropylene material prepared using the recycling method for polypropylene sports flooring according to any one of claims 1 to 6, characterized in that, It includes a core layer made of recycled polypropylene and a surface layer composited on the upper and lower surfaces of the core layer; the surface layer material is modified polypropylene.

8. The multi-layer composite sports floor according to claim 7, characterized in that, The modified polypropylene material comprises 100 parts by weight of homopolymer PP, 5 parts by weight of polysiloxane masterbatch, and 0.5 parts by weight of UV-326.

9. The multi-layer composite sports floor according to claim 7, characterized in that, Polypropylene recycled material and modified polypropylene material are prepared by co-injection molding.

10. A type of interlocking flooring made from recycled polypropylene material prepared using the recycling method for polypropylene sports flooring according to any one of claims 1 to 6, characterized in that, The device includes a surface layer and a support layer disposed below the surface layer. The surface layer is made of modified polypropylene material, and the support layer is made of recycled polypropylene. A support column is provided below the support layer. The surface layer and the support layer are connected by a snap-fit ​​structure. The snap-fit ​​structure includes a buckle disposed on the top surface of the support layer and a slot disposed on the bottom surface of the surface layer. The slots are arranged in a rectangular array on the bottom surface of the surface layer and are located near the edge of the surface layer. The positions of the buckles correspond to the positions of the slots.

Images