Damping artificial turf and preparation method thereof

Abstract

The invention discloses a damping artificial turf and a preparation method thereof, and belongs to the technical field of artificial turfs, the damping artificial turf sequentially comprises an artificial grass yarn layer, a first base cloth layer, a damping phenyl silicone rubber layer and a second base cloth layer from top to bottom; the thickness ratio of the artificial grass yarn layer to the first base cloth layer to the damping phenyl silicone rubber layer to the second base cloth layer is (1.8-2.2): (0.2-0.4): 1.2: (0.2-0.4); the artificial grass yarn layer is prepared from the following raw materials: basic resin, pigment, tri (triethylene tetramine) hexaacetic acid, a double-base flame retardant DOPS-TEAIC, a lubricant PPA and modified calcium carbonate powder. The flame retardant property of the double-base flame retardant DOPS-TEAIC is obviously optimized through the triethylene tetramine hexaacetic acid. Meanwhile, the sodium carbonate powder is modified, so that the anti-static effect is effectively improved. And the modified sodium carbonate powder and triethylene tetramine hexaacetic acid are compounded for use, so that the aging resistance of the artificial turf is remarkably enhanced.

Description

Technical Field

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

[0002] Artificial turf meets the needs of high-intensity sports in all weather conditions, and has the advantages of simple maintenance, rapid drainage, uniformity and durability, and low water consumption. Therefore, it is widely used in special competition venues such as hockey, baseball, and rugby, as well as leisure and environmental landscape venues. With the development of artificial turf, its color, appearance, and performance are closer to natural grass.

[0003] For example, Chinese patent CN115304843B discloses a high-strength flame-retardant artificial grass yarn, which includes the following raw materials by weight: polyethylene oxide, silicon dioxide, titanium dioxide, carbide, elastomer, aromatic masterbatch, coloring masterbatch, antioxidant, plasticizer, flame retardant, ultraviolet absorber, antistatic agent. By adding the combination of carbides, the mechanical properties such as strength and elongation at break of artificial grass yarn can be effectively improved, while the wear and resilience of grass yarn can be improved, and the artificial grass yarn also has certain flame retardant properties.

[0004] However, the above patent has strong electrical insulation. After being charged by friction, the charges accumulated on the surface of the material are difficult to dissipate and discharge is likely to occur, so the antistatic performance needs to be improved. In addition, the above patent is difficult to maintain good performance after long-term outdoor use.

[0005] Based on this, the present invention designs a shock-absorbing artificial turf and a preparation method thereof to solve the above problems. Summary of the invention

[0006] In view of the above-mentioned shortcomings of the prior art, the present invention provides a shock-absorbing artificial turf and a preparation method thereof.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: A shock-absorbing artificial turf, which comprises, from top to bottom, an artificial grass yarn layer, a first base fabric layer, a shock-absorbing phenyl silicone rubber layer, and a second base fabric layer; The thickness ratio of the artificial grass layer, the first base fabric layer, the shock-absorbing phenyl silicone rubber layer and the second base fabric layer is 1.8-2.2: 0.2-0.4: 1.2: 0.2-0.4; The artificial grass layer includes the following raw materials: 72-78 parts of basic resin, 13-15 parts of pigment, 9-13 parts of triethylenetetraaminehexaacetic acid, 6-8 parts of double-base flame retardant DOPS-TEAIC, 17-26 parts of lubricant PPA, and 25-43 parts of modified calcium carbonate powder; The basic resin is a mixture of polyethylene and polypropylene in a mass ratio of 45-59:63-87.

[0008] A method for preparing the shock-absorbing artificial turf comprises the following steps: Step 1: preparing modified calcium carbonate powder; A. Preheat the calcium carbonate powder to 80-88°C, spread the calcium carbonate powder flat and send it into the steam generating chamber, passing through 370-380°C triethanolamine oleate steam; B. Drying the calcium carbonate powder after passing through triethanolamine oleate vapor in a nitrogen atmosphere at 40-45° C. to obtain modified calcium carbonate powder; Step 2: preparing grass silk masterbatch; A. Stir the double-base flame retardant DOPS-TEAIC and triethylenetetraaminehexaacetic acid at 48-52° C. and 150-230 r / min for 15-20 min to obtain a mixture A; B. Heat 2 / 3-3 / 4 of mixture A to 35-38° C., add basic resin mixed with modified calcium carbonate powder, and stir at a speed of 180-260 r / min for 20-30 min to obtain mixture B; C. When the mixture B is naturally cooled to 20-25°C, add the lubricant PPA mixed with the pigment, and stir at a speed of 200-280r / min for 20-30min to obtain the grass silk masterbatch; Step 3: Add the grass fiber masterbatch into a screw extruder for extrusion and drawing to obtain grass fiber; Step 4: Prepare a shock-absorbing phenyl silicone rubber layer, apply 1 / 4-1 / 3 of the mixture A on both sides of the shock-absorbing phenyl silicone rubber layer and dry it; Step 5: knitting the grass silk onto the first base fabric layer through a tufting machine, thereby forming an artificial grass silk layer on the first base fabric layer; Step 6: Adhere the first base fabric layer and the second base fabric layer to the front and back sides of the shock-absorbing phenyl silicone rubber layer dried in step 4 by using an adhesive to obtain a shock-absorbing artificial turf.

[0009] Furthermore, in step one, step A is specifically as follows: preheating the calcium carbonate powder to 80-88° C., spreading the calcium carbonate powder to a thickness of 1.2-1.8 cm, sending the calcium carbonate powder into a steam generating chamber, and passing through oleic acid triethanolamine steam at 370-380° C.

[0010] Furthermore, in step 1, step B is specifically as follows: drying the calcium carbonate powder after passing through triethanolamine oleate vapor in a nitrogen atmosphere at 40-45° C. for 20-30 minutes to obtain modified calcium carbonate powder.

[0011] Furthermore, in step 2, step A is specifically as follows: a double-base flame retardant DOPS-TEAIC and 4-5 parts of triethylenetetraaminehexaacetic acid in a mass ratio of 6-8:4-5 are stirred at 48-52° C. and a speed of 150-230 r / min for 15-20 min to obtain a mixture A.

[0012] Furthermore, in step 2, step B is specifically as follows: 2 / 3-3 / 4 of mixture A is heated to 35-38° C., added to a mixture of 25-43 parts of modified calcium carbonate powder and 72-78 parts of basic resin, and stirred at a speed of 180-260 r / min for 20-30 min to obtain mixture B.

[0013] Furthermore, in step 2, step C is specifically as follows: when the mixture B is naturally cooled to 20-25°C, 13-15 parts of pigment and 17-26 parts of lubricant PPA are added to the mixture, and stirred at a speed of 200-280r / min for 20-30min to obtain the grass silk masterbatch.

[0014] Furthermore, step three is specifically as follows: adding the grass fiber masterbatch into a screw extruder for extrusion and drawing to obtain grass fiber, and the extrusion and drawing temperature is 220-240°C.

[0015] Furthermore, step four is specifically as follows: coating 1 / 4-1 / 3 of mixture A on both sides of the shock-absorbing phenyl silicone rubber layer and drying; the drying time is 20-25 minutes, and the drying temperature is 70-76°C.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention significantly optimizes the flame retardant properties of the double-base flame retardant DOPS-TEAIC, and this improvement is due to the clever addition of triethylenetetraaminehexaacetic acid. At the same time, by implementing modification technology on sodium carbonate powder, the antistatic effect of the present invention is effectively improved. It is worth mentioning that the modified sodium carbonate powder and triethylenetetraaminehexaacetic acid are compounded to significantly enhance the aging resistance of artificial turf. Specifically, even after aging treatment, the artificial turf can still maintain excellent flame retardant and antistatic properties, and other key performance indicators, such as the breaking strength of the horizontal and vertical base fabrics, weather fastness, water permeability, and single filament breaking strength, all meet the established standards. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] Embodiment 1 This embodiment provides a method for preparing a shock-absorbing phenyl silicone rubber layer, comprising the following steps: Step A, adding 6.5 kg of methylsiloxane and 0.1 kg of ammonia water into a reaction container, and introducing nitrogen into the reaction container at a reaction temperature of 52° C. for 2 hours to obtain a basic catalyst; Step B, according to parts by weight, 71 kg of methylsiloxane and 4 kg of phenylsiloxane are added to a reaction container, the air pressure in the reaction container is controlled to be negative pressure, and stirred at 56° C. for 20 minutes, and then 1 kg of the alkaline catalyst is added, and the temperature is raised to 100° C. for anionic ring-opening polymerization reaction, and 0.1 kg of isocyanate is added after reacting for 1 hour, and then reacted for 1 hour, and then heated to 150° C., stirred and continuously heated for 0.5 hours, while keeping the air pressure in the reaction container at negative pressure, thereby preparing a shock-absorbing phenyl silicone rubber; Step C, putting the shock-absorbing phenyl silicone rubber into a mold of a vulcanizer, vulcanizing at 210° C. for 10 minutes, cooling to room temperature after the vulcanization, and demolding to obtain a shock-absorbing phenyl silicone rubber layer.

[0019] Embodiment 2 This embodiment provides a shock-absorbing artificial turf, which comprises, from top to bottom, an artificial grass yarn layer, a first base fabric layer, a shock-absorbing phenyl silicone rubber layer, and a second base fabric layer; The thickness ratio of the artificial grass layer, the first base fabric layer, the shock-absorbing phenyl silicone rubber layer and the second base fabric layer is 2.2:0.4:1.2:0.4; The following steps are involved: Step 1: preparing modified calcium carbonate powder; A. Preheat the calcium carbonate powder to 88°C, spread the calcium carbonate powder to a thickness of 1.8 cm, send the calcium carbonate powder into the steam generating chamber, and pass through the oleic acid triethanolamine steam at 380°C; B. Drying the calcium carbonate powder after passing through triethanolamine oleate vapor in a nitrogen atmosphere for 30 min at 45° C. to obtain modified calcium carbonate powder; Step 2: preparing grass silk masterbatch; A. 8 kg of double-base flame retardant DOPS-TEAIC and 5 kg of triethylenetetraaminehexaacetic acid were stirred at 52° C. and 230 r / min for 20 min to obtain a mixture A; B. Heat 3 / 4 of mixture A to 38° C., add 43 kg of modified calcium carbonate powder and 72 kg of basic resin into the mixture, and stir at a speed of 260 r / min for 30 min to obtain mixture B; C. When the mixture B is naturally cooled to 25°C, 15 kg of pigment and 26 kg of lubricant PPA are added to the mixture, and stirred at a speed of 280 r / min for 30 min to obtain a grass silk masterbatch; The basic resin is a mixture of polyethylene and polypropylene in a mass ratio of 59:87; Step 3: Add the grass fiber masterbatch into a screw extruder for extrusion and drawing to obtain grass fiber, and the extrusion and drawing temperature is 240°C; Step 4: coating 1 / 4 of the mixture A on both sides of the shock-absorbing phenyl silicone rubber layer prepared in Example 1 and drying the layer; the drying time is 25 minutes and the drying temperature is 76° C.; Step 5: knitting the grass silk onto the first base fabric layer through a tufting machine, thereby forming an artificial grass silk layer on the first base fabric layer; Step 6: Adhere the first base fabric layer and the second base fabric layer to the front and back sides of the shock-absorbing phenyl silicone rubber layer dried in step 4 by using an adhesive to obtain a shock-absorbing artificial turf.

[0020] The dual-base flame retardant DOPS-TEAIC is derived from [1] Xu Qiu, Hou Zeming, Huan Xuanying, et al. Synthesis of dual-base flame retardant DOPS-TEAIC and its flame retardant properties of epoxy resin [J / OL]. Polymer Materials Science and Engineering, 1-14 [2024-10-31]. https: / / hfgfy7789d7bbe5f747dbscfwqv0wnnwq660o6ficg.res.gxlib.org.cn / 10.16865 / j.cnki.1000-7555.2024.0097. The preparation method of the double-base flame retardant DOPS-TEAIC is specifically as follows: 34.8 kg DOPS (9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-sulfide), 2 kg triethylamine and 70 L dioxane are stirred and mixed evenly, then 26.4 kg tris(2-acryloxyethyl)isocyanurate is fully dissolved in 50 L dioxane at 40°C, and then the dioxane solution of tris(2-acryloxyethyl)isocyanurate is slowly added dropwise to the above reaction system, reacted at 85°C for 20 hours, after the reaction is completed and cooled to room temperature, washed with distilled water several times, and dried to obtain a pure white solid product, which is the double-base flame retardant DOPS-TEAIC.

[0021] The steam generating chamber refers to a graphite modification device and modification method disclosed in Chinese patent CN109095465B: triethanolamine oleate is used to generate modified gas through a steam generator and released through the gap holes on an operating table, the operating table is arranged above the steam generator, a graphite plate is fixed to the operating table through a positioning piece, a plurality of gap holes are formed between the operating table and the first steam chamber, and when the calcium carbonate powder is placed on the operating table, the modified gas contacts the lower surface of the calcium carbonate powder.

[0022] The adhesive was purchased from Shandong Chuangying Chemical Co., Ltd.

[0023] Embodiment 3 This embodiment provides a shock-absorbing artificial turf, which comprises, from top to bottom, an artificial grass yarn layer, a first base fabric layer, a shock-absorbing phenyl silicone rubber layer, and a second base fabric layer; The thickness ratio of the artificial grass layer, the first base fabric layer, the shock-absorbing phenyl silicone rubber layer and the second base fabric layer is 1.8:0.2:1.2:0.2; The following steps are involved: Step 1: preparing modified calcium carbonate powder; A. Preheat the calcium carbonate powder to 80°C, spread the calcium carbonate powder to a thickness of 1.2 cm, send the calcium carbonate powder into the steam generating chamber, and pass through the 370°C triethanolamine oleate steam; B. Drying the calcium carbonate powder after passing through triethanolamine oleate vapor in a nitrogen atmosphere at 40° C. for 20 min to obtain modified calcium carbonate powder; Step 2: preparing grass silk masterbatch; A. 6 kg of double-base flame retardant DOPS-TEAIC and 4 kg of triethylenetetraaminehexaacetic acid were stirred at 48°C and 150 r / min for 15 min to obtain a mixture A; B. Heat 2 / 3 of mixture A to 35° C., add 25 kg of modified calcium carbonate powder and 78 kg of basic resin into the mixture, and stir at a speed of 180 r / min for 20 min to obtain mixture B; C. When the mixture B is naturally cooled to 20°C, 13 kg of pigment and 17 kg of lubricant PPA are added to the mixture, and stirred at a speed of 200 r / min for 20 min to obtain a grass silk masterbatch; The basic resin is a mixture of polyethylene and polypropylene in a mass ratio of 45:63; Step 3: Add the grass fiber masterbatch into a screw extruder for extrusion and drawing to obtain grass fiber, and the extrusion and drawing temperature is 220°C; Step 4: coating 1 / 3 of the mixture A on both sides of the shock-absorbing phenyl silicone rubber layer prepared in Example 1 and drying the layer; the drying time is 20 minutes and the drying temperature is 70° C.; Step 5: knitting the grass silk onto the first base fabric layer through a tufting machine, thereby forming an artificial grass silk layer on the first base fabric layer; Step 6: Adhere the first base fabric layer and the second base fabric layer to the front and back sides of the shock-absorbing phenyl silicone rubber layer dried in step 4 by using an adhesive to obtain a shock-absorbing artificial turf.

[0024] Embodiment 4 This embodiment provides a shock-absorbing artificial turf, which comprises, from top to bottom, an artificial grass yarn layer, a first base fabric layer, a shock-absorbing phenyl silicone rubber layer, and a second base fabric layer; The thickness ratio of the artificial grass layer, the first base fabric layer, the shock-absorbing phenyl silicone rubber layer and the second base fabric layer is 1.9:0.2:1.2:0.2; The following steps are involved: Step 1: preparing modified calcium carbonate powder; A. Preheat the calcium carbonate powder to 85°C, spread the calcium carbonate powder to a thickness of 1.4 cm, send the calcium carbonate powder into the steam generating chamber, and pass through the oleic acid triethanolamine steam at 372°C; B. Drying the calcium carbonate powder after passing through triethanolamine oleate vapor in a nitrogen atmosphere at 44° C. for 25 min to obtain modified calcium carbonate powder; Step 2: preparing grass silk masterbatch; A. 7 kg of double-base flame retardant DOPS-TEAIC and 4 kg of triethylenetetraaminehexaacetic acid were stirred at 51° C. and 210 r / min for 15 min to obtain a mixture A; B. Heat 2 / 3 of mixture A to 36°C, add 31 kg of modified calcium carbonate powder and 75 kg of basic resin into the mixture, and stir at a speed of 220 r / min for 24 min to obtain mixture B; C. When the mixture B is naturally cooled to 22°C, 14 kg of pigment and 21 kg of lubricant PPA are added to the mixture, and stirred at a speed of 240 r / min for 22 min to obtain a grass silk masterbatch; The basic resin is a mixture of polyethylene and polypropylene in a mass ratio of 51:66; Step 3: Add the grass fiber masterbatch into a screw extruder for extrusion and drawing to obtain grass fiber, and the extrusion and drawing temperature is 230°C; Step 4: coating 1 / 3 of the mixture A on both sides of the shock-absorbing phenyl silicone rubber layer prepared in Example 1 and drying the layer; the drying time is 25 minutes and the drying temperature is 74° C.; Step 5: knitting the grass silk onto the first base fabric layer through a tufting machine, thereby forming an artificial grass silk layer on the first base fabric layer; Step 6: Adhere the first base fabric layer and the second base fabric layer to the front and back sides of the shock-absorbing phenyl silicone rubber layer dried in step 4 by using an adhesive to obtain a shock-absorbing artificial turf.

[0025] Comparative Example 1 The difference from Example 4 is that: triethylenetetraaminehexaacetic acid is not added in this comparative example; The shock-absorbing artificial turf comprises, from top to bottom, an artificial grass yarn layer, a first base fabric layer, a shock-absorbing phenyl silicone rubber layer, and a second base fabric layer; The thickness ratio of the artificial grass layer, the first base fabric layer, the shock-absorbing phenyl silicone rubber layer and the second base fabric layer is 1.9:0.2:1.2:0.2; The following steps are involved: Step 1: preparing modified calcium carbonate powder; A. Preheat the calcium carbonate powder to 85°C, spread the calcium carbonate powder to a thickness of 1.4 cm, send the calcium carbonate powder into the steam generating chamber, and pass through the oleic acid triethanolamine steam at 372°C; B. Drying the calcium carbonate powder after passing through triethanolamine oleate vapor in a nitrogen atmosphere at 44° C. for 25 min to obtain modified calcium carbonate powder; Step 2: preparing grass silk masterbatch; A. Stir 7 kg of double-base flame retardant DOPS-TEAIC at 51°C and 210 r / min for 15 min to obtain mixture A; B. Heat 2 / 3 of mixture A to 36°C, add 31 kg of modified calcium carbonate powder and 75 kg of basic resin into the mixture, and stir at a speed of 220 r / min for 24 min to obtain mixture B; C. When the mixture B is naturally cooled to 22°C, 14 kg of pigment and 21 kg of lubricant PPA are added to the mixture, and stirred at a speed of 240 r / min for 22 min to obtain a grass silk masterbatch; The basic resin is a mixture of polyethylene and polypropylene in a mass ratio of 51:66; Step 3: Add the grass fiber masterbatch into a screw extruder for extrusion and drawing to obtain grass fiber, and the extrusion and drawing temperature is 230°C; Step 4: coating 1 / 3 of the mixture A on both sides of the shock-absorbing phenyl silicone rubber layer prepared in Example 1 and drying the layer; the drying time is 25 minutes and the drying temperature is 74° C.; Step 5: knitting the grass silk onto the first base fabric layer through a tufting machine, thereby forming an artificial grass silk layer on the first base fabric layer; Step 6: Adhere the first base fabric layer and the second base fabric layer to the front and back sides of the shock-absorbing phenyl silicone rubber layer dried in step 4 by using an adhesive to obtain a shock-absorbing artificial turf.

[0026] Comparative Example 2 The difference from Example 4 is that the sodium carbonate powder was not modified in this comparative example; The shock-absorbing artificial turf comprises, from top to bottom, an artificial grass yarn layer, a first base fabric layer, a shock-absorbing phenyl silicone rubber layer, and a second base fabric layer; The thickness ratio of the artificial grass layer, the first base fabric layer, the shock-absorbing phenyl silicone rubber layer and the second base fabric layer is 1.9:0.2:1.2:0.2; The following steps are involved: Step 1: preparing grass silk masterbatch; A. 7 kg of double-base flame retardant DOPS-TEAIC and 4 kg of triethylenetetraaminehexaacetic acid were stirred at 51° C. and 210 r / min for 15 min to obtain a mixture A; B. Heat 2 / 3 of mixture A to 36°C, add 31 kg of calcium carbonate powder and 75 kg of basic resin into the mixture, and stir at a speed of 220 r / min for 24 min to obtain mixture B; C. When the mixture B is naturally cooled to 22°C, 14 kg of pigment and 21 kg of lubricant PPA are added to the mixture, and stirred at a speed of 240 r / min for 22 min to obtain a grass silk masterbatch; The basic resin is a mixture of polyethylene and polypropylene in a mass ratio of 51:66; Step 2: Add the grass fiber masterbatch into a screw extruder for extrusion and drawing to obtain grass fiber, and the extrusion and drawing temperature is 230°C; Step 3: coating 1 / 3 of the mixture A on both sides of the shock-absorbing phenyl silicone rubber layer prepared in Example 1 and drying the layer; the drying time is 25 minutes and the drying temperature is 74° C.; Step 4: knitting the grass silk onto the first base fabric layer through a tufting machine, thereby forming an artificial grass silk layer on the first base fabric layer; Step 5: Adhere the first base fabric layer and the second base fabric layer to the front and back sides of the shock-absorbing phenyl silicone rubber layer dried in step 4 by using an adhesive, thereby obtaining a shock-absorbing artificial turf.

[0027] Comparative Example 3 The difference from Example 4 is that this comparative example neither modifies the sodium carbonate powder nor adds triethylenetetraaminehexaacetic acid; The shock-absorbing artificial turf comprises, from top to bottom, an artificial grass yarn layer, a first base fabric layer, a shock-absorbing phenyl silicone rubber layer, and a second base fabric layer; The thickness ratio of the artificial grass layer, the first base fabric layer, the shock-absorbing phenyl silicone rubber layer and the second base fabric layer is 1.9:0.2:1.2:0.2; The following steps are involved: Step 1: preparing grass silk masterbatch; A. Stir 7 kg of double-base flame retardant DOPS-TEAIC at 51°C and 210 r / min for 15 min to obtain mixture A; B. Heat 2 / 3 of mixture A to 36°C, add 31 kg of calcium carbonate powder and 75 kg of basic resin into the mixture, and stir at a speed of 220 r / min for 24 min to obtain mixture B; C. When the mixture B is naturally cooled to 22°C, 14 kg of pigment and 21 kg of lubricant PPA are added to the mixture, and stirred at a speed of 240 r / min for 22 min to obtain a grass silk masterbatch; The basic resin is a mixture of polyethylene and polypropylene in a mass ratio of 51:66; Step 2: Add the grass fiber masterbatch into a screw extruder for extrusion and drawing to obtain grass fiber, and the extrusion and drawing temperature is 230°C; Step 3: coating 1 / 3 of the mixture A on both sides of the shock-absorbing phenyl silicone rubber layer prepared in Example 1 and drying the layer; the drying time is 25 minutes and the drying temperature is 74° C.; Step 4: knitting the grass silk onto the first base fabric layer through a tufting machine, thereby forming an artificial grass silk layer on the first base fabric layer; Step 5: Adhere the first base fabric layer and the second base fabric layer to the front and back sides of the shock-absorbing phenyl silicone rubber layer dried in step 4 by using an adhesive, thereby obtaining a shock-absorbing artificial turf.

[0028] Experimental example 1. Aging test: The total test time is 2000 hours. Experimental equipment: American QUV / SPRAY, total irradiation: 2870W / ㎡, test procedure: light intensity 0.85W / ㎡, 65℃ illumination for 4 hours←→45℃ condensation for 2 hours, cycle for 2000 hours; during the test, samples aged for 1000 hours and 2000 hours were retained respectively.

[0029] 2. Antistatic test: The resistivity (Ω) before aging T0, aging 1000 hours T1 and aging 2000 hours T2 is tested by the method of GB / T 15662-1995; the higher the resistivity, the worse the antistatic effect will be, because high resistivity means that the material has a stronger resistance to current, and static electricity is not easy to leak or dissipate, so it is easier to accumulate and may cause problems such as electrostatic discharge.

[0030] 3. Flame retardant test: Cut out lawn samples with an area of ​​10cm×10cm together with the base fabric, and use open flame to continuously burn the front, back and edges of six groups of samples, and observe the burning conditions.

[0031] In addition, the artificial turf prepared by the present invention still meets the GB / T 20394-2019 standard after aging for 2000 hours, that is, the horizontal and vertical base cloth breaking force is ≥800N; the weather resistance color fastness is ≥5 level; the water permeability is ≥20L / (min•m2); the single-filament breaking force is ≥10N; As can be seen from the above table, the present invention effectively improves the flame retardant effect of the double-base flame retardant DOPS-TEAIC by adding triethylenetetraaminehexaacetic acid; effectively improves the antistatic effect by modifying the sodium carbonate powder; in addition, the modified sodium carbonate powder is compounded with triethylenetetraaminehexaacetic acid, which significantly improves the aging resistance of the artificial turf, which is manifested in that the artificial turf after aging still maintains excellent flame retardant and antistatic effects, and other indicators, such as the transverse and longitudinal base cloth breaking strength, weather fastness, water permeability and single-filament breaking strength, still meet the composite standards.

[0032] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A shock-absorbing artificial turf, characterized in that: The shock-absorbing artificial turf comprises, from top to bottom, an artificial grass yarn layer, a first base fabric layer, a shock-absorbing phenyl silicone rubber layer, and a second base fabric layer; The thickness ratio of the artificial grass layer, the first base fabric layer, the shock-absorbing phenyl silicone rubber layer and the second base fabric layer is 1.8-2.2: 0.2-0.4: 1.2: 0.2-0.4; The artificial grass layer includes the following raw materials: 72-78 parts of basic resin, 13-15 parts of pigment, 9-13 parts of triethylenetetraaminehexaacetic acid, 6-8 parts of double-base flame retardant DOPS-TEAIC, 17-26 parts of lubricant PPA, and 25-43 parts of modified calcium carbonate powder; The basic resin is a mixture of polyethylene and polypropylene in a mass ratio of 45-59:63-87.

2. A method for preparing the shock-absorbing artificial turf according to claim 1, characterized in that: The following steps are involved: Step 1: preparing modified calcium carbonate powder; A. Preheat the calcium carbonate powder to 80-88°C, spread the calcium carbonate powder flat and send it into the steam generating chamber, passing through 370-380°C triethanolamine oleate steam; B. Drying the calcium carbonate powder after passing through triethanolamine oleate vapor in a nitrogen atmosphere at 40-45° C. to obtain modified calcium carbonate powder; Step 2: preparing grass silk masterbatch; A. Stir the double-base flame retardant DOPS-TEAIC and triethylenetetraaminehexaacetic acid at 48-52° C. and 150-230 r / min for 15-20 min to obtain a mixture A; B. Heat 2 / 3-3 / 4 of mixture A to 35-38° C., add basic resin mixed with modified calcium carbonate powder, and stir at a speed of 180-260 r / min for 20-30 min to obtain mixture B; C. When the mixture B is naturally cooled to 20-25°C, add the lubricant PPA mixed with the pigment, and stir at a speed of 200-280r / min for 20-30min to obtain the grass silk masterbatch; Step 3: Add the grass fiber masterbatch into a screw extruder for extrusion and drawing to obtain grass fiber; Step 4: Prepare a shock-absorbing phenyl silicone rubber layer, apply 1 / 4-1 / 3 of the mixture A on both sides of the shock-absorbing phenyl silicone rubber layer and dry it; Step 5: knitting the grass silk onto the first base fabric layer through a tufting machine, thereby forming an artificial grass silk layer on the first base fabric layer; Step 6: Adhere the first base fabric layer and the second base fabric layer to the front and back sides of the shock-absorbing phenyl silicone rubber layer dried in step 4 by using an adhesive to obtain a shock-absorbing artificial turf.

3. The method for preparing the shock-absorbing artificial turf according to claim 2, characterized in that: In step one, step A is specifically as follows: preheating the calcium carbonate powder to 80-88° C., spreading the calcium carbonate powder to a thickness of 1.2-1.8 cm, sending the calcium carbonate powder into a steam generating chamber, and passing through oleic acid triethanolamine steam at 370-380° C.

4. The method for preparing the shock-absorbing artificial turf according to claim 2, characterized in that: In step 1, step B is specifically as follows: drying the calcium carbonate powder after passing through triethanolamine oleate vapor in a nitrogen atmosphere for 20-30 minutes at 40-45° C. to obtain modified calcium carbonate powder.

5. The method for preparing the shock-absorbing artificial turf according to claim 2, characterized in that: In step 2, step A is specifically as follows: a double-base flame retardant DOPS-TEAIC and 4-5 parts of triethylenetetraaminehexaacetic acid in a mass ratio of 6-8:4-5 are stirred at 48-52° C. and a speed of 150-230 r / min for 15-20 min to obtain a mixture A.

6. The method for preparing the shock-absorbing artificial turf according to claim 2, characterized in that: In step 2, step B is specifically as follows: 2 / 3-3 / 4 of mixture A is heated to 35-38° C., added to a mixture of 25-43 parts of modified calcium carbonate powder and 72-78 parts of basic resin, and stirred at a speed of 180-260 r / min for 20-30 min to obtain mixture B.

7. The method for preparing the shock-absorbing artificial turf according to claim 2, characterized in that: In step 2, step C is specifically as follows: when the mixture B is naturally cooled to 20-25° C., 13-15 parts of pigment and 17-26 parts of lubricant PPA are added to the mixture, and stirred at a speed of 200-280 r / min for 20-30 minutes to obtain a grass silk masterbatch.

8. The method for preparing the shock-absorbing artificial turf according to claim 2, characterized in that: Step three is as follows: adding the grass fiber masterbatch into a screw extruder for extrusion and drawing to obtain grass fiber, and the extrusion and drawing temperature is 220-240°C.

9. The method for preparing the shock-absorbing artificial turf according to claim 2, characterized in that: Step 4 is as follows: 1 / 4-1 / 3 of the mixture A is coated on both sides of the shock-absorbing phenyl silicone rubber layer and dried; the drying time is 20-25 minutes, and the drying temperature is 70-76°C.

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