Nano-modified sports ground surface layer material and preparation method thereof

Abstract

The application discloses a nano-modified sports ground surface layer material and a preparation method thereof. The nano-modified sports ground surface layer material comprises the following preparation raw materials in parts by weight: 100 parts of thermoplastic polyurethane; 15-35 parts of rubber particles; 5-15 parts of fiber material; 5-15 parts of nano-silicon dioxide; 10-25 parts of nano-inorganic filler; 0-10 parts of pigment; 5-15 parts of inorganic foaming agent; 3-10 parts of antioxidant; and 1-5 parts of ultraviolet absorber. The nano-modified sports ground surface layer material has the advantages of large elasticity, large mechanical strength, excellent wear resistance, good weather resistance, long service life and the like, and the preparation method is simple, the production cost is relatively low, and the nano-modified sports ground surface layer material is suitable for large-scale industrial production and application.

Description

Technical Field

[0001] This invention relates to the field of elastic flooring materials, specifically to a nano-modified sports field flooring material and its preparation method. Background Technology

[0002] Resilient flooring materials refer to flooring materials with a certain degree of flexibility, shock absorption, and comfortable feel underfoot, and are widely used in sports fields, children's activity areas, gyms, and other places. The core characteristics of resilient flooring materials are impact resistance, slip resistance, sound absorption, and comfort, while also effectively reducing sports injuries, making them very popular. Currently, there are many types of resilient flooring materials, which can be mainly divided into plastic resilient flooring (PU / rubber-based), rubber mats / rolls, PVC resilient flooring, and silicone PU (silicone-modified polyurethane), according to material composition and use. However, these resilient flooring materials generally suffer from problems such as low elasticity, low mechanical strength, poor wear resistance, poor weather resistance, short service life, and high maintenance costs, making it difficult to fully meet the growing practical application requirements.

[0003] Therefore, it is of great significance to develop a sports field surface material with high elasticity, high mechanical strength, excellent wear resistance, good weather resistance, and long service life.

[0004] The above statements are merely background information related to the present invention and do not necessarily constitute prior art. Summary of the Invention

[0005] The purpose of this invention is to provide a nano-modified sports field surface material and its preparation method.

[0006] The technical solution adopted in this invention is:

[0007] A nano-modified sports field surface material, comprising the following raw materials in parts by weight:

[0008] Thermoplastic polyurethane: 100 parts;

[0009] Rubber granules: 15 to 35 parts;

[0010] Fiber material: 5 to 15 parts;

[0011] Nano silica: 5 to 15 parts;

[0012] Nano-inorganic fillers: 10 to 25 parts;

[0013] Pigment: 0 to 10 parts;

[0014] Inorganic foaming agent: 5 to 15 parts;

[0015] Antioxidant: 3 to 10 parts;

[0016] UV absorber: 1 to 5 parts.

[0017] Preferably, the particle size of the rubber particles is 0.5 mm to 3 mm.

[0018] Preferably, the fiber material is at least one selected from cellulose fiber, polyethylene fiber, polypropylene fiber, glass fiber, quartz fiber, carbon fiber, and aramid fiber.

[0019] Preferably, the fiber material has a length of 1 mm to 5 mm and a diameter of 200 μm to 800 μm.

[0020] Preferably, the particle size of the nano-silica is 20nm to 200nm.

[0021] Preferably, the nano-inorganic filler is at least one of nano-calcium carbonate, nano-ceramic powder, nano-metal oxide, and nano-clay.

[0022] Preferably, the particle size of the nano-inorganic filler is 50nm to 250nm.

[0023] Preferably, the pigment is at least one of iron oxide red, iron oxide yellow, ultramarine, titanium dioxide, and phthalocyanine green.

[0024] Preferably, the inorganic foaming agent is at least one of sodium bicarbonate and ammonium sulfate.

[0025] Preferably, the antioxidant is at least one of antioxidant 1010 (pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]), antioxidant 1076 (octadecyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate), antioxidant 168 (tris[2,4-di-tert-butylphenyl]phosphite), antioxidant 264 (2,6-di-tert-butyl-p-cresol), antioxidant 1098 (N,N'-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexamethylenediamine), and antioxidant 1024 (N,N'-bis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl]hydrazine).

[0026] Preferably, the ultraviolet absorber is at least one of 2-hydroxy-4-methylbenzophenone, 2-hydroxy-4-n-octyloxybenzophenone, and 2,4-dihydroxybenzophenone.

[0027] Preferably, the interior of the nano-modified sports field surface material contains a number of closed micropores with a pore size of 40μm to 200μm.

[0028] A method for preparing a nano-modified sports field surface material as described above includes the following steps:

[0029] Thermoplastic polyurethane, rubber particles, fiber materials, nano silica, nano inorganic fillers, pigments, inorganic foaming agents, antioxidants and ultraviolet absorbers are added to a mixing equipment for melt blending, and then injected into a mold for foaming and molding to obtain nano-modified sports field surface material.

[0030] Preferably, the mixing equipment is one of a single-screw extruder, a twin-screw extruder, or an internal mixer.

[0031] Preferably, the melt blending is carried out at a temperature of 140°C to 160°C (to avoid decomposition of the inorganic foaming agent).

[0032] Preferably, the foaming process is carried out at a temperature of 200℃ to 230℃, and the foaming time is 20 min to 40 min.

[0033] The beneficial effects of this invention are: the nano-modified sports field surface material of this invention has the advantages of high elasticity, high mechanical strength, excellent wear resistance, good weather resistance, and long service life. Moreover, its preparation method is simple and the production cost is low, making it suitable for large-scale industrial production and application.

[0034] Specifically:

[0035] 1) The nano-modified sports field surface material of the present invention contains a large number of closed micropores. The micropores are evenly distributed and have relatively uniform pore size (pore size is 40μm~200μm). In addition, rubber particles are added to the nano-modified sports field surface material. The rubber particles themselves have excellent resilience. The synergistic effect of the microporous structure and the rubber particles gives the surface material a long-lasting high elasticity.

[0036] 2) The nano-modified sports field surface material of the present invention contains fiber material, which can significantly improve the mechanical strength of the surface material, thereby effectively preventing the surface material from being damaged or falling off due to external forces. Moreover, the improvement of mechanical strength can also improve the wear resistance of the surface material to a certain extent.

[0037] 3) The nano-modified sports field surface material of the present invention contains nano-silica and nano-inorganic filler. The synergistic effect of the two can significantly improve the wear resistance of the surface material and also improve the mechanical strength of the surface material to a certain extent.

[0038] 4) The nano-modified sports field surface material of the present invention contains antioxidants and ultraviolet absorbers, which can give the surface material excellent weather resistance, extend the service life of the surface material, and reduce the maintenance cost of the surface material.

[0039] 5) The preparation method of the nano-modified sports field surface material of the present invention is simple, the raw materials are widely available, and the production cost is low. It can be used in various places that require the laying of elastic surface materials, such as sports fields, children's activity areas, and gyms, and is suitable for large-scale industrial production and application. Detailed Implementation

[0040] The present invention will be further explained and described below with reference to specific embodiments.

[0041] Example 1:

[0042] A nano-modified sports field surface material, the composition of which is shown in the table below:

[0043] Table 1. Raw material composition of a nano-modified sports field surface material

[0044] raw material Number of weights Thermoplastic polyurethane (BASF's Cellasto MH24-60) 100 Rubber granules (particle size 0.5mm~3mm) 15 Cellulose fibers (length 1mm~5mm, diameter 200μm~500μm) 6 Nano-sized silica (particle size 50nm~100nm) 8 Nano-sized calcium carbonate (particle size 100nm~250nm) 15 Iron oxide red 4 Sodium bicarbonate 5 Antioxidant 1010 4 2-Hydroxy-4-methylbenzophenone 2

[0045] The preparation method of the above-mentioned nano-modified sports field surface material is as follows:

[0046] Thermoplastic polyurethane, rubber particles, cellulose fibers, nano silica, nano calcium carbonate, iron oxide red, sodium bicarbonate, antioxidant 1010, and 2-hydroxy-4-methylbenzophenone were added to a twin-screw extruder for melt blending and then injected into a mold. The melt blending temperature was controlled at 140℃, and then foamed and molded at 220℃ for 30 minutes. After natural cooling to room temperature, the nano-modified sports field surface material was obtained.

[0047] Example 2:

[0048] A nano-modified sports field surface material, the composition of which is shown in the table below:

[0049] Table 2. Raw material composition of a nano-modified sports field surface material

[0050] raw material Number of weights Thermoplastic polyurethane (BASF's Cellasto MH24-60) 100 Rubber granules (particle size 0.5mm~3mm) 20 Polyethylene fibers (length 1mm~5mm, diameter 400μm~800μm) 8 Nano-sized silica (particle size 50nm~100nm) 8 Nano-alumina (particle size 50nm~200nm) 10 Iron oxide yellow 6 Sodium bicarbonate 7 Antioxidant 1010 5 2-Hydroxy-4-n-Octyloxybenzophenone 2.5

[0051] The preparation method of the above-mentioned nano-modified sports field surface material is as follows:

[0052] Thermoplastic polyurethane, rubber particles, polyethylene fiber, nano silica, nano alumina, iron oxide yellow, sodium bicarbonate, antioxidant 1010 and 2-hydroxy-4-n-octyloxybenzophenone were added to a twin-screw extruder for melt blending and then injected into a mold. The melt blending temperature was controlled at 140℃, and then foamed and molded at 220℃ for 30 minutes. After natural cooling to room temperature, the nano-modified sports field surface material was obtained.

[0053] Example 3:

[0054] A nano-modified sports field surface material, the composition of which is shown in the table below:

[0055] Table 3. Raw material composition of a nano-modified sports field surface material

[0056] raw material Number of weights Thermoplastic polyurethane (BASF's Cellasto MH24-60) 100 Rubber granules (particle size 0.5mm~3mm) 25 Cellulose fibers (length 1mm~5mm, diameter 200μm~500μm) 10 Nano-sized silica (particle size 50nm~100nm) 10 Nano-sized calcium carbonate (particle size 100nm~250nm) 20 Phthalocyanine Green 8 Sodium bicarbonate 10 Antioxidant 1010 5 Antioxidant 168 2 2-Hydroxy-4-methylbenzophenone 3

[0057] The preparation method of the above-mentioned nano-modified sports field surface material is as follows:

[0058] Thermoplastic polyurethane, rubber particles, cellulose fibers, nano silica, nano calcium carbonate, phthalocyanine green, sodium bicarbonate, antioxidant 1010, antioxidant 168 and 2-hydroxy-4-methylbenzophenone were added to a twin-screw extruder for melt blending and then injected into a mold. The melt blending temperature was controlled at 140℃, and then foamed and molded at 220℃ for 30 minutes. After natural cooling to room temperature, the nano-modified sports field surface material was obtained.

[0059] Example 4:

[0060] A nano-modified sports field surface material, the composition of which is shown in the table below:

[0061] Table 4. Raw material composition of a nano-modified sports field surface material

[0062] raw material Number of weights Thermoplastic polyurethane (BASF's Cellasto MH24-60) 100 Rubber granules (particle size 0.5mm~3mm) 30 Aramid fibers (length 1mm~5mm, diameter 300μm~700μm) 15 Nano-sized silica (particle size 50nm~100nm) 8 Nano clay (particle size 150nm~250nm) 15 ultramarine 4 ammonium sulfate 5 Antioxidant 1010 4 2,4-Dihydroxybenzophenone 2

[0063] The preparation method of the above-mentioned nano-modified sports field surface material is as follows:

[0064] Thermoplastic polyurethane, rubber particles, aramid fiber, nano silica, nano clay, ultramarine, ammonium sulfate, antioxidant 1010 and 2,4-dihydroxybenzophenone were added to a twin-screw extruder for melt blending and then injected into a mold. The melt blending temperature was controlled at 140℃, and then foamed and molded at 220℃ for 30 minutes. After natural cooling to room temperature, the nano-modified sports field surface material was obtained.

[0065] Comparative Example 1:

[0066] A sports field surface material is identical to the nano-modified sports field surface material of Example 3, except that it does not contain rubber particles.

[0067] Comparative Example 2:

[0068] A sports field surface material is identical to the nano-modified sports field surface material of Example 3, except that it does not contain cellulose fibers.

[0069] Comparative Example 3:

[0070] A sports field surface material is identical to the nano-modified sports field surface material of Example 3, except that it does not contain nano-silica.

[0071] Comparative Example 4:

[0072] A sports field surface material is identical to the nano-modified sports field surface material of Example 3, except that it does not contain nano-calcium carbonate.

[0073] Performance testing:

[0074] The performance test results of the nano-modified sports field surface materials of Examples 1-4 and the sports field surface materials of Comparative Examples 1-4 are shown in the table below:

[0075] Table 5 Performance test results of nano-modified sports field surface material and sports field surface material

[0076] Test Project Micropore size (μm) Tensile strength (MPa) Impact absorption (%) Rebound rate (%) Abrasion resistance / 100g, 1000r (mg) Example 1 75～125 22.5 46 42 35 Example 2 70～130 23.4 51 46 40 Example 3 85～140 25.8 55 52 20 Example 4 60～90 21.3 61 57 32 Comparative Example 1 95～145 23.1 42 40 27 Comparative Example 2 80～140 18.6 52 44 56 Comparative Example 3 85～145 21.7 56 49 95 Comparative Example 4 75～140 21.0 57 48 101

[0077] Note:

[0078] Micropore size: The environmentally friendly polyurethane foam roll was cut open, and the cross-section was observed and photographed using a microscope. The pore size range of the micropores was then measured and statistically analyzed.

[0079] Tensile strength: Tested in accordance with "GB / T 10654-2001 Determination of tensile strength and elongation at break of porous polymer materials".

[0080] Impact absorption: Tested according to "GB / T 14833-2011 Synthetic material runway surface layer".

[0081] Rebound rate: Tested in accordance with "GB / T 14833-2011 Synthetic material runway surface layer".

[0082] Abrasion resistance: Tested according to "GB / T 1768-2006 Determination of abrasion resistance of paints and varnishes - Rotary rubber grinding wheel method".

[0083] As shown in Table 5:

[0084] 1) The nano-modified sports field surface materials in Examples 1 to 4 have relatively uniform micropore size, high tensile strength, good impact absorption performance, good resilience, and good wear resistance. They have excellent comprehensive performance and are suitable for use in sports fields, children's activity areas, gyms, and other places.

[0085] 2) Compared with the nano-modified sports field surface material of Example 3, the impact absorption and rebound properties of the sports field surface material of Comparative Example 1 (without rubber particles) are significantly reduced, indicating that the synergistic effect of microporous structure and rubber particles can endow the surface material with high elasticity.

[0086] 3) Compared with the nano-modified sports field surface material of Example 3, the tensile strength and wear resistance of the sports field surface material of Comparative Example 2 (without cellulose fiber) are significantly reduced. This shows that the fiber material can significantly improve the mechanical strength of the surface material, thereby effectively preventing the surface material from being damaged or falling off under external force. Moreover, the improvement of mechanical strength can also improve the wear resistance of the surface material to a certain extent.

[0087] 4) Compared with the nano-modified sports field surface material of Example 3, the wear resistance of the sports field surface material of Comparative Example 3 (without nano silica) and Comparative Example 4 (without nano calcium carbonate) was significantly reduced, and the tensile strength also decreased significantly. This shows that the synergistic effect of nano silica and nano inorganic filler can significantly improve the wear resistance of the surface material, and can also improve the mechanical strength of the surface material to a certain extent.

[0088] In summary, by introducing closed micropores, fiber materials, nano-silica, nano-inorganic fillers, antioxidants, and ultraviolet absorbers into the ground layer material, this invention enables the ground layer material to possess numerous advantages such as high elasticity, high mechanical strength, excellent wear resistance, good weather resistance, and long service life, making it suitable for large-scale industrial application in places such as sports fields, children's activity areas, and gyms.

[0089] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A nano-modified sports field surface material, characterized in that, The preparation materials include the following parts by weight: Thermoplastic polyurethane: 100 parts; Rubber granules: 15 to 35 parts; Fiber material: 5 to 15 parts; Nano silica: 5 to 15 parts; Nano-inorganic fillers: 10 to 25 parts; Pigment: 0 to 10 parts; Inorganic foaming agent: 5 to 15 parts; Antioxidant: 3 to 10 parts; UV absorber: 1 to 5 parts.

2. The nano-modified sports field surface material according to claim 1, characterized in that: The size of the rubber particles is 0.5 mm to 3 mm.

3. The nano-modified sports field surface material according to claim 1, characterized in that: The fiber material is at least one of cellulose fiber, polyethylene fiber, polypropylene fiber, glass fiber, quartz fiber, carbon fiber, and aramid fiber.

4. The nano-modified sports field surface material according to any one of claims 1 to 3, characterized in that: The fiber material has a length of 1 mm to 5 mm and a diameter of 200 μm to 800 μm.

5. The nano-modified sports field surface material according to any one of claims 1 to 3, characterized in that: The nano-inorganic filler is at least one of nano-calcium carbonate, nano-ceramic powder, nano-metal oxide, and nano-clay.

6. The nano-modified sports field surface material according to any one of claims 1 to 3, characterized in that: The pigment is at least one of iron oxide red, iron oxide yellow, ultramarine, titanium dioxide, and phthalocyanine green.

7. The nano-modified sports field surface material according to any one of claims 1 to 3, characterized in that: The inorganic foaming agent is at least one of sodium bicarbonate and ammonium sulfate.

8. The nano-modified sports field surface material according to any one of claims 1 to 3, characterized in that: The antioxidant is at least one of antioxidant 1010, antioxidant 1076, antioxidant 168, antioxidant 264, antioxidant 1098, and antioxidant 1024; the ultraviolet absorber is at least one of 2-hydroxy-4-methylbenzophenone, 2-hydroxy-4-n-octyloxybenzophenone, and 2,4-dihydroxybenzophenone.

9. The nano-modified sports field surface material according to any one of claims 1 to 3, characterized in that: The nano-modified sports field surface material contains several closed micropores with a pore size of 40μm to 200μm.

10. A method for preparing a nano-modified sports field surface material as described in any one of claims 1 to 9, characterized in that, The process includes the following steps: adding thermoplastic polyurethane, rubber particles, fiber materials, nano-silica, nano-inorganic fillers, pigments, inorganic foaming agents, antioxidants, and ultraviolet absorbers into a mixing equipment for melt blending, and then injecting the mixture into a mold for foaming and molding to obtain the nano-modified sports field surface material.