Wear-resistant artificial turf and preparation method thereof

Abstract

The invention discloses a wear-resistant artificial turf and a preparation method thereof, the wear-resistant artificial turf comprises a base cloth and a plurality of clusters of grass filaments tufted on the base cloth, the grass filaments are of an open net structure, a latex layer is arranged on the bottom surface of the base cloth, and the roots of the grass filaments are bonded and fixed with the bottom surface of the base cloth; the grass yarns comprise the following raw materials in parts by mass: 65-85 parts of linear low-density polyethylene, 15-35 parts of linear high-density polyethylene, 3-6 parts of color master batches, 1-2 parts of a surface modifier and 1-3 parts of a processing aid, and the surface modifier comprises one or more of zinc stearate, calcium stearate and hexagonal boron nitride. The thickness of the grass filaments is larger than or equal to 160 micrometers. According to the invention, the wear resistance of the artificial turf product is improved from the grass filament components and grass filament preparation, so that the overall mechanical properties of the grass filaments are improved, and the wear time is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of artificial turf, and in particular relates to a wear-resistant artificial turf and a preparation method thereof. Background Art

[0002] Artificial turf has the advantages of high frequency use all year round and all-weather, as well as low cost and convenient maintenance. It is widely used in various sports, fitness and leisure venues, such as football fields, tennis courts, hockey fields, golf courses, comprehensive sports fields, amusement parks, kindergartens, residential courtyards, parks, etc. At present, the preparation process of artificial turf is mature, and artificial turf products are becoming more and more perfect, but artificial turf still has obvious shortcomings during use, especially in sports venues. During intense exercise, artificial turf undergoes strong actions such as rapid trampling, squeezing, sliding, pulling, etc., which may cause problems such as heating, cracking of grass fibers, and falling of grass. At present, the industry mainly proposes improvements on the raw material formula of artificial turf. For example, CN2022107554582-An artificial turf with high single-cluster pull-out force and its preparation process proposes an improved grass fiber filament, which is prepared from polyethylene, acrylic ester emulsion, polyetherimide, nano-silica, infrared reflective titanium dioxide, light stabilizer, magnesium oxide, aluminum oxide, boron nitride, silicon carbide, self-silane coupling agent, antioxidant, and lubricant. It is directly formed on the base fabric through 3D printing technology, so that the artificial turf has excellent single-cluster pull-out force and grass fiber breaking force; CN201711044798X-An artificial turf fiber and its preparation method improves the tensile strength of the grass fiber and ensures the mechanical properties of the grass fiber by compounding octadecyl dihydroxyethyl methyl ammonium bromide and ethylene glycol monostearate.

[0003] However, the above technology has limited effect on improving the performance of grass fiber. The efficiency and cost of producing artificial turf by 3D printing technology are also high, and it is not suitable for large-scale industrial production. Therefore, the present invention intends to propose a new type of artificial turf to effectively improve the wear resistance of artificial turf. Summary of the invention

[0004] In order to solve the above technical problems, the purpose of the present invention is to provide a wear-resistant artificial turf and a preparation method, so as to improve the wear resistance of artificial turf products from the perspective of grass fiber composition and grass fiber preparation, thereby improving the overall mechanical properties of the grass fiber and extending the wear time.

[0005] In order to achieve the above-mentioned invention object, the technical solution adopted by the present invention is as follows:

[0006] In a first aspect of the present invention, a wear-resistant artificial turf is provided, comprising a base fabric and a plurality of grass tufts tufted on the base fabric, wherein the grass tufts are of an open mesh structure, a latex layer is arranged on the bottom surface of the base fabric, the roots of the grass tufts pass through the base fabric, and the latex layer bonds and fixes the roots of the grass tufts to the bottom surface of the base fabric;

[0007] Calculated by mass, the raw materials of the grass silk include 65 to 85 parts of linear low-density polyethylene, 15 to 35 parts of linear high-density polyethylene, 3 to 6 parts of masterbatch, 1 to 2 parts of surface modifier and 1 to 3 parts of processing aid, wherein the surface modifier includes one or more of zinc stearate, calcium stearate, and hexagonal boron nitride.

[0008] Preferably, the thickness of the grass fibers is ≥160 μm.

[0009] Preferably, the processing aids include light stabilizers, antioxidants and fluoride aids.

[0010] In a second aspect of the present invention, the present invention provides a method for preparing a wear-resistant artificial turf, as follows:

[0011] Linear low-density polyethylene, linear high-density polyethylene, masterbatch, surface modifier and processing aid are mixed, and wear-resistant grass yarn is obtained after blending extrusion, traction, drawing, mesh breaking, shaping, winding and twisting. The grass yarn is woven on a base fabric, and latex is coated on the bottom surface of the base fabric to fix the grass yarn to the base fabric.

[0012] Preferably, a knife roller is used to break the grass fibers so that the grass fibers form an open mesh structure.

[0013] Preferably, during the preparation of the grass fibers, the extrusion temperature is 190-240°C.

[0014] Preferably, in the process of preparing grass silk, the drafting ratio is 8 times.

[0015] Beneficial effects:

[0016] The present invention improves the wear resistance of artificial turf products from the perspective of grass silk composition and grass silk preparation. The grass silk material is modified by adding a surface modifier to reduce the friction generated by the contact between the grass silk and foreign objects, thereby achieving the purpose of reducing wear. At the same time, the grass silk net breaking method is improved, the thickness of the grass silk is increased, the overall mechanical properties of the grass silk are improved, the wear time is extended, and the purpose of extending the service life of the artificial turf product is achieved. DETAILED DESCRIPTION

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific solutions of the present invention will be described below with reference to the examples. Obviously, the following descriptions are only some embodiments of the present invention, and for those of ordinary skill in the art, other implementation methods can also be obtained based on these embodiments without creative work.

[0018] The present invention provides a wear-resistant artificial turf, comprising a base fabric and a plurality of grass tufts tufted on the base fabric, wherein the grass tufts are an open mesh structure, a latex layer is arranged on the bottom surface of the base fabric, the roots of the grass tufts pass through the base fabric, and the latex layer bonds and fixes the roots of the grass tufts to the bottom surface of the base fabric.

[0019] In the present invention, the composition of the grass silk is special, and the mechanical properties of the grass silk are improved by adding a modifier, as follows:

[0020] Calculated by mass, the raw materials of grass silk include: 65-85 parts of linear low-density polyethylene, 15-35 parts of linear high-density polyethylene, 3-6 parts of masterbatch, 1-2 parts of surface modifier and 1-4 parts of processing aid, among which the surface modifier is zinc stearate, calcium stearate and hexagonal boron nitride.

[0021] Hexagonal boron nitride has excellent hardness and wear resistance. Adding it to plastics can greatly improve its wear resistance and enable it to withstand higher friction and wear. Irregular hexagonal boron nitride crystals nucleate on the outer surface. These irregular crystals enhance the crosslinking between the nanotubes and the polymer substrate. When the content of hexagonal boron nitride nanotubes is 1%, the mechanical strength of the components manufactured by injection molding can be increased by 25-40%. Zinc stearate and calcium stearate are common lubricants and release agents that can effectively reduce the friction coefficient and play a lubricating role. At the same time, zinc stearate and calcium stearate have high hardness and strength, which can effectively increase the strength and stiffness of polyethylene collectives, improve the mechanical properties of materials, and make the materials more wear-resistant and impact-resistant.

[0022] In the present invention, low-density polyethylene (LDPE) is relatively soft and has low strength, while high-density polyethylene (HDPE) has high hardness and poor toughness. The two can be blended to complement each other and obtain a PE material with moderate hardness and softness. Two polyethylenes with different densities can be blended in various mixing ratios to obtain a series of blends with intermediate properties, whose density, crystallinity, softening point, hardness, etc. all change with the blending ratio, and whose physical and mechanical properties are 20-50% higher than that of LDPE.

[0023] Preferably, the processing aids include a light stabilizer, an antioxidant and a fluoride additive, wherein the light stabilizer is preferably BASF 2020, and the antioxidant is preferably BASF IRGANOX B225.

[0024] In the present invention, the linear low density polyethylene and linear high density polyethylene can be polyethylene of brands such as 7042 (Sinopec, linear low density), 5000S (PetroChina, linear high density), 2036 (Dow, linear high density), and 2047 (Dow, linear low density).

[0025] The present invention improves the raw material formula of grass silk, improves the wear resistance of the grass silk itself by matching two polyethylenes and adding a surface modifier. In addition, the present invention also improves the structure and preparation method of the grass silk to further improve the wear resistance of the grass silk. The specific preparation steps are as follows:

[0026] The extrusion temperature is set at 190-240°C and the drawing ratio is 8 times. The raw materials are mixed, and after blending extrusion, traction, drawing, net breaking, shaping, winding and twisting, wear-resistant grass silk is obtained. The grass silk is woven on the base cloth, and latex is coated on the bottom surface of the base cloth to fix the grass silk and the base cloth.

[0027] Different from the needle roller opening treatment in the prior art, the present invention uses a knife roller to open the grass wire to form an open mesh structure. Since the knife roller is used for the opening treatment, the thickness of the grass wire can be appropriately increased. Preferably, the thickness of the grass wire is ≥160μm. Compared with the needle roller treatment that limits the grass wire thickness to <120μm, the thickness of the grass wire of the present invention is improved, which is beneficial to increase its wear resistance.

[0028] The technical solution of the present invention is described in detail below with specific embodiments.

[0029] Example 1

[0030] Calculated by mass, the raw materials of grass silk include 65 parts of linear low-density polyethylene 7042, 35 parts of linear high-density polyethylene 5000S, 1.5 parts of zinc stearate, 4 parts of masterbatch and 3.5 parts of processing aids.

[0031] The extrusion temperature is set to 225°C and the drawing ratio is set to 8 times. The raw materials are mixed and processed through blending extrusion, traction, drawing, net breaking (the grass silk is broken by a knife roller to form an open net structure), shaping, winding and twisting to obtain wear-resistant grass silk with a thickness of 160 μm. The grass silk is woven on a base fabric, latex is coated on the bottom surface of the base fabric, and the grass silk is fixed to the base fabric to obtain a wear-resistant artificial turf.

[0032] Example 2

[0033] Calculated by mass, the raw materials of grass silk include 75 parts of linear low-density polyethylene 7042, 25 parts of linear high-density polyethylene 5000S, 1.5 parts of zinc stearate, 4 parts of masterbatch and 3.5 parts of processing aids.

[0034] The extrusion temperature is set to 225°C and the drawing ratio is set to 8 times. The raw materials are mixed and processed through blending extrusion, traction, drawing, net breaking (the grass silk is broken by a knife roller to form an open net structure), shaping, winding and twisting to obtain wear-resistant grass silk with a thickness of 160 μm. The grass silk is woven on a base fabric, latex is coated on the bottom surface of the base fabric, and the grass silk is fixed to the base fabric to obtain a wear-resistant artificial turf.

[0035] Example 3

[0036] Calculated by mass, the raw materials of grass silk include 65 parts of linear low-density polyethylene 7042, 35 parts of linear high-density polyethylene 5000S, 1.5 parts of calcium stearate, 4 parts of masterbatch and 3.5 parts of processing aids.

[0037] The extrusion temperature is set to 225°C and the drawing ratio is set to 8 times. The raw materials are mixed and processed through blending extrusion, traction, drawing, net breaking (the grass silk is broken by a knife roller to form an open net structure), shaping, winding and twisting to obtain wear-resistant grass silk with a thickness of 160 μm. The grass silk is woven on a base fabric, latex is coated on the bottom surface of the base fabric, and the grass silk is fixed to the base fabric to obtain a wear-resistant artificial turf.

[0038] Example 4

[0039] Calculated by mass, the raw materials of grass silk include 65 parts of linear low-density polyethylene 7042, 35 parts of linear high-density polyethylene 5000S, 1.5 parts of hexagonal boron nitride, 4 parts of masterbatch and 3.5 parts of processing aids.

[0040] The extrusion temperature is set to 225°C and the drawing ratio is set to 8 times. The raw materials are mixed and processed through blending extrusion, traction, drawing, net breaking (the grass silk is broken by a knife roller to form an open net structure), shaping, winding and twisting to obtain wear-resistant grass silk with a thickness of 160 μm. The grass silk is woven on a base fabric, latex is coated on the bottom surface of the base fabric, and the grass silk is fixed to the base fabric to obtain a wear-resistant artificial turf.

[0041] Example 5

[0042] Calculated by mass, the raw materials of grass silk include 75 parts of linear low-density polyethylene 7042, 25 parts of linear high-density polyethylene 5000S, 1.5 parts of hexagonal boron nitride, 4 parts of masterbatch and 3.5 parts of processing aids.

[0043] The extrusion temperature is set to 225°C and the drawing ratio is set to 8 times. The raw materials are mixed and processed through blending extrusion, traction, drawing, net breaking (the grass silk is broken by a knife roller to form an open net structure), shaping, winding and twisting to obtain wear-resistant grass silk with a thickness of 160 μm. The grass silk is woven on a base fabric, latex is coated on the bottom surface of the base fabric, and the grass silk is fixed to the base fabric to obtain a wear-resistant artificial turf.

[0044] Example 6

[0045] Calculated by mass, the raw materials of grass silk include 65 parts of linear low-density polyethylene 7042, 35 parts of linear high-density polyethylene 5000S, 0.5 parts of zinc stearate, 1 part of calcium stearate, 4 parts of masterbatch and 3.5 parts of processing aids.

[0046] The extrusion temperature is set to 225°C and the drawing ratio is set to 8 times. The raw materials are mixed and processed through blending extrusion, traction, drawing, net breaking (the grass silk is broken by a knife roller to form an open net structure), shaping, winding and twisting to obtain wear-resistant grass silk with a thickness of 160 μm. The grass silk is woven on a base fabric, latex is coated on the bottom surface of the base fabric, and the grass silk is fixed to the base fabric to obtain a wear-resistant artificial turf.

[0047] Example 7

[0048] Calculated by mass, the raw materials of grass silk include 65 parts of linear low-density polyethylene 7042, 35 parts of linear high-density polyethylene 5000S, 0.5 parts of zinc stearate, 1 part of hexagonal boron nitride, 4 parts of masterbatch and 3.5 parts of processing aids.

[0049] The extrusion temperature is set to 225°C and the drawing ratio is set to 8 times. The raw materials are mixed and processed through blending extrusion, traction, drawing, net breaking (the grass silk is broken by a knife roller to form an open net structure), shaping, winding and twisting to obtain wear-resistant grass silk with a thickness of 160 μm. The grass silk is woven on a base fabric, latex is coated on the bottom surface of the base fabric, and the grass silk is fixed to the base fabric to obtain a wear-resistant artificial turf.

[0050] Example 8

[0051] Calculated by mass, the raw materials of grass silk include 65 parts of linear low-density polyethylene 7042, 35 parts of linear high-density polyethylene 5000S, 0.5 parts of calcium stearate, 1 part of boron nitride, 4 parts of masterbatch and 3.5 parts of processing aids.

[0052] The extrusion temperature is set to 225°C and the drawing ratio is set to 8 times. The raw materials are mixed and processed through blending extrusion, traction, drawing, net breaking (the grass silk is broken by a knife roller to form an open net structure), shaping, winding and twisting to obtain wear-resistant grass silk with a thickness of 160 μm. The grass silk is woven on a base fabric, latex is coated on the bottom surface of the base fabric, and the grass silk is fixed to the base fabric to obtain a wear-resistant artificial turf.

[0053] Example 9

[0054] Calculated by mass, the raw materials of grass silk include 65 parts of linear low-density polyethylene 7042, 35 parts of linear high-density polyethylene 5000S, 0.5 parts of zinc stearate, 0.5 parts of calcium stearate, 0.5 parts of boron nitride, 4 parts of masterbatch and 3.5 parts of processing aids.

[0055] The extrusion temperature is set to 225°C and the drawing ratio is set to 8 times. The raw materials are mixed and processed through blending extrusion, traction, drawing, net breaking (the grass silk is broken by a knife roller to form an open net structure), shaping, winding and twisting to obtain wear-resistant grass silk with a thickness of 160 μm. The grass silk is woven on a base fabric, latex is coated on the bottom surface of the base fabric, and the grass silk is fixed to the base fabric to obtain a wear-resistant artificial turf.

[0056] Example 10

[0057] Calculated by mass, the raw materials of grass silk include 85 parts of linear low-density polyethylene 7042, 15 parts of linear high-density polyethylene 5000S, 1.5 parts of calcium stearate, 4 parts of masterbatch and 3.5 parts of processing aids.

[0058] The extrusion temperature is set to 225°C and the drawing ratio is set to 8 times. The raw materials are mixed and processed through blending extrusion, traction, drawing, net breaking (the grass yarn is broken by a knife roller to form an open net structure), shaping, winding and twisting to obtain wear-resistant grass yarn with a thickness of 180 μm. The grass yarn is woven on a base fabric, latex is coated on the bottom surface of the base fabric, and the grass yarn is fixed to the base fabric to obtain a wear-resistant artificial turf.

[0059] Comparative Example 1

[0060] Calculated by mass, the raw materials of grass silk include 70 parts of linear low-density polyethylene 7042, 30 parts of linear high-density polyethylene 5000S, 4 parts of masterbatch and 3.5 parts of processing aids.

[0061] The extrusion temperature is set to 225°C and the drawing ratio is set to 8 times. The raw materials are mixed and processed through blending extrusion, traction, drawing, net breaking (the grass silk is broken by a conventional needle roller to form an open net structure), shaping, winding and twisting to obtain grass silk with a thickness of 120 μm. The grass silk is woven on a base fabric, latex is coated on the bottom surface of the base fabric, and the grass silk is fixed to the base fabric to obtain an artificial turf.

[0062] Comparative Example 2

[0063] Calculated by mass, the raw materials of grass silk include 70 parts of linear low-density polyethylene 7042, 30 parts of linear high-density polyethylene 5000S, 10 parts of hexagonal boron nitride, 4 parts of masterbatch and 3.5 parts of processing aids.

[0064] The extrusion temperature was set at 225°C and the drawing ratio was set at 8 times. The raw materials were mixed and subjected to blending extrusion, traction, drawing, net breaking (the grass silk was broken by conventional needle rollers to form an open net structure), shaping, winding and twisting. The resulting grass silk frequently broke during the wire drawing process and could not be produced normally.

[0065] Comparative Example 3

[0066] Calculated by mass, the raw materials of grass silk include 100 parts of linear low-density polyethylene 7042, 4 parts of masterbatch and 3.5 parts of processing aids.

[0067] The extrusion temperature is set to 225°C and the drawing ratio is set to 8 times. The raw materials are mixed and processed through blending extrusion, traction, drawing, net breaking (the grass silk is broken by a conventional needle roller to form an open net structure), shaping, winding and twisting to obtain grass silk with a thickness of 120 μm. The grass silk is woven on a base fabric, latex is coated on the bottom surface of the base fabric, and the grass silk is fixed to the base fabric to obtain an artificial turf.

[0068] Comparative Example 4

[0069] Calculated by mass, the raw materials of grass silk include 100 parts of linear high-density polyethylene 5000S, 4 parts of masterbatch and 3.5 parts of processing aids.

[0070] The extrusion temperature was set at 225°C and the drawing ratio was 8 times. The raw materials were mixed and processed through blending extrusion, traction, drawing, net breaking (the grass silk was broken by a conventional needle roller to form an open net structure), shaping, winding and twisting to obtain grass silk with a thickness of 120 μm. The grass silk was relatively hard and the needle roller could not break the grass silk membrane to form an open net structure. The grass silk was in the form of an overall sheet.

[0071] The spike roller on the Lisport testing equipment rolls back and forth on the artificial turf sample to simulate normal use, when athletes wear spiked sports shoes and exercise on the turf. After a certain period of time, the wear of the turf is inspected and evaluated.

[0072]

[0073] From the perspective of wear resistance weeks, compared with Comparative Examples 1 and 3, Examples 1-10 all improve the wear resistance weeks to varying degrees and extend the service life, which intuitively demonstrates that the artificial turf of the present invention has good wear resistance.

[0074] The embodiments provided by the present invention are described in detail above. Specific examples are used herein to describe the principles and implementation methods of the present invention, and the description of the above embodiments is only used to help understand the core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified in a number of ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A wear-resistant artificial turf, characterized in that: It comprises a base fabric and a plurality of grass tufts tufted on the base fabric, wherein the grass tufts are of an open mesh structure, a latex layer is arranged on the bottom surface of the base fabric, the roots of the grass tufts pass through the base fabric, and the latex layer bonds and fixes the roots of the grass tufts to the bottom surface of the base fabric; Calculated by mass, the raw materials of the grass silk include 65 to 85 parts of linear low-density polyethylene, 15 to 35 parts of linear high-density polyethylene, 3 to 6 parts of masterbatch, 1 to 2 parts of surface modifier and 1 to 3 parts of processing aid, wherein the surface modifier includes one or more of zinc stearate, calcium stearate, and hexagonal boron nitride.

2. The wear-resistant artificial turf according to claim 1, characterized in that: The thickness of the grass fibers is ≥160 μm.

3. The wear-resistant artificial turf according to claim 1, characterized in that: The processing aids include light stabilizers, antioxidants and fluoride aids.

4. A method for preparing a wear-resistant artificial turf, characterized in that: The wear-resistant artificial turf according to any one of claims 1 to 3 is prepared as follows: Linear low-density polyethylene, linear high-density polyethylene, masterbatch, surface modifier and processing aid are mixed, and wear-resistant grass yarn is obtained after blending extrusion, traction, drawing, mesh breaking, shaping, winding and twisting. The grass yarn is woven on a base fabric, and latex is coated on the bottom surface of the base fabric to fix the grass yarn to the base fabric.

5. The preparation method according to claim 4, characterized in that: The grass fibers are broken by knife rollers to form an open mesh structure.

6. The preparation method according to claim 5, characterized in that: The thickness of the grass fibers is ≥160 μm.

7. The preparation method according to claim 4, characterized in that: In the process of preparing grass silk, the extrusion temperature is 190-240°C.

8. The preparation method according to claim 4, characterized in that: In the process of preparing grass silk, the drafting ratio is 8 times.

Images