Impact-resistant and crack-resistant ski lawn and method for preparing the same

Abstract

This invention relates to the field of ski turf, specifically to an impact-resistant and crack-resistant ski turf and its preparation method, which addresses the problems of high cost, large investment, poor impact resistance, and low tear strength of existing indoor ski turf. This ski turf uses polypropylene blended with epoxy resin containing flexible side chains as artificial grass fibers, and incorporates -B-O- bonds into EPDM rubber as a rubber buffer layer, jointly improving the impact resistance and tear strength of the ski turf. This ski turf is suitable for indoor low-temperature use; the composite polypropylene used as artificial grass fibers exhibits higher impact resistance at low temperatures than ordinary polypropylene, making it better suited for ski resorts. Furthermore, polypropylene is low in cost, reducing the overall cost of artificial ski turf.

Description

Technical Field

[0001] This invention relates to the field of ski turf, specifically to an impact-resistant and crack-resistant ski turf and its preparation method. Background Technology

[0002] As people's living standards continue to improve, skiing has become a popular winter sport. However, due to limitations in venues and environment, conventional skiing areas are generally outdoor snowfields, which restricts the development of this sport. Later, indoor skiing venues were developed, but due to their high cost and resource consumption, they are not conducive to energy-saving development. Subsequently, artificial ski turf was developed, but existing ski turf has poor tear resistance, low impact strength, and poor cushioning ability. When people fall while skiing, the insufficient cushioning ability can lead to increased injuries, which is detrimental to people's safety. Now, the cushioning ability of artificial ski turf is improved by enhancing the impact resistance of artificial grass fibers and the tear resistance of the rubber cushioning layer. Summary of the Invention

[0003] In order to overcome the above-mentioned technical problems, the present invention aims to provide: an impact-resistant and crack-resistant ski turf and its preparation method, which solves the problems of poor impact resistance, low tear strength and poor cushioning capacity of existing artificial ski turf.

[0004] The objective of this invention can be achieved through the following technical solutions:

[0005] An impact-resistant and crack-resistant ski turf and its preparation method include: adding composite polypropylene to a twin-screw extruder, melting and extruding to form artificial grass fibers; cutting the artificial grass fibers to a height of 3-6 cm, and weaving them onto a polyester filament nonwoven fabric using an artificial turf base fabric weaving machine in a tufted weaving manner, with a weaving density of 38,000-110,000 tufts / square meter and a denier controlled within the range of 3,000-16,000D; uniformly coating the polyester filament nonwoven fabric surface with PU adhesive, and curing the PU adhesive using heating equipment; adding modified EPDM rubber and a softener to a mixing mill for melting, then uniformly coating the PU adhesive surface, cooling and curing to obtain the artificial ski turf.

[0006] As a further aspect of the present invention: the composite polypropylene is prepared by the following steps:

[0007] Step A1: Add 2,2′-diallylbisphenol A, epichlorohydrin and tetramethylammonium bromide to a three-necked flask equipped with a stirrer and thermometer, and react for 10-20 min at a stirring rate of 100-200 r / min. Add potassium hydroxide and react for 20-30 min at a temperature of 50-80℃. After the reaction, add dilute hydrochloric acid to neutralize, wash with water 3-4 times, and filter to obtain allylbisphenol A type epoxy resin.

[0008] Step A2: Add allyl bisphenol A type epoxy resin, octadecyl mercaptan and 2-hydroxy-2-methylphenylacetone photoinitiator to a single-necked flask, mix well, place the single-necked flask in a UV-LED ultraviolet light source irradiation environment, and react for 4-5 hours to obtain epoxy resin with flexible side chains.

[0009] Step A3: Add polypropylene, ethylene-vinyl acetate copolymer and maleic anhydride grafted polypropylene into a two-roll mill and mix for 3-4 minutes at a temperature of 180-220℃ and a speed of 60-70 r / min. The product is then discharged to obtain EVA polypropylene mixed granules.

[0010] Step A4: Add the mixed granules of flexible side-chain epoxy resin, EVA polypropylene, and maleic anhydride-grafted polypropylene to a high-speed mixer and mix for 3-5 minutes. Add the stirred mixture to a twin-screw extruder and melt-blend for 5-10 minutes at a temperature of 190-200℃ and a speed of 50-100 rpm. Add 2-ethyl-4-methylimidazole and continue mixing. After mixing, extrude and granulate to obtain the composite polypropylene resin.

[0011] As a further aspect of the present invention: the ratio of 2,2′-diallylbisphenol A, epichlorohydrin, tetramethylammonium bromide, potassium hydroxide and dilute hydrochloric acid in step A1 is 0.05-0.1 mol: 0.1-0.2 mol: 1-2 mol: 1.5-2.8 g: 50-100 mL.

[0012] As a further aspect of the present invention: the concentration of the dilute hydrochloric acid in step A1 is 0.5 mol / L.

[0013] As a further aspect of the present invention: the ratio of allyl bisphenol A type epoxy resin, octadecyl mercaptan and 2-hydroxy-2-methylphenylacetone photoinitiator in step A2 is 50-100g: 100-200g: 0.1-0.2g.

[0014] As a further aspect of the present invention: the wavelength of the UV-LED ultraviolet light source in step A2 is 365nm.

[0015] As a further aspect of the present invention: the ratio of polypropylene, ethylene-vinyl acetate copolymer and maleic anhydride-grafted polypropylene in step A3 is 50-100g: 12.5-25g: 0.14-0.29g.

[0016] As a further aspect of the present invention: the polypropylene in step A3 is of type RA140E; the ethylene-vinyl acetate copolymer is of type VC640; and the maleic anhydride-grafted polypropylene is of type QB510.

[0017] As a further aspect of the present invention: the ratio of the amount of flexible side-chain epoxy resin, EVA polypropylene blend particles, maleic anhydride grafted polypropylene and 2-ethyl-4-methylimidazole in step A4 is 10-15g: 40-60g: 5-10g: 2.5-5g.

[0018] As a further aspect of the present invention: the maleic anhydride-grafted polypropylene in step A4 is of type QB510.

[0019] As a further aspect of the present invention: the modified EPDM rubber is prepared by the following steps:

[0020] Step B1: Add high-viscosity hydroxyl-terminated polydimethylsiloxane and low-viscosity polydimethylsiloxane to a vacuum kneader and stir evenly for 2-3 hours at a temperature of 24-26℃. Add tetrahydroxydiborane and then methanol. Raise the temperature to 80-100℃, evacuate the vacuum for 5-6 hours, and cool to obtain boron-grafted polyborosiloxane.

[0021] Step B2: Add EPDM rubber to the mixing chamber and mix for 1-2 minutes at a temperature of 60-70℃ and a speed of 30 r / min. Add boron-grafted polyborosiloxane and continue mixing for 1-2 minutes. After mixing, add magnesium oxide, 2-thiol-benzimidazole zinc salt, carbon black, and paraffin oil, and continue mixing for 5-7 minutes. Cool the temperature to 70-80℃, add 2,2′-dibenzothiazole disulfide and sulfur, and continue mixing for 1-2 minutes. Then discharge the rubber and add the masterbatch to a two-roll mill. Bring the masterbatch to a triangular shape 6 times, adjust the gap between the two rolls to 4 mm, and pass it through a thin mill 10 times. After uniform mixing, sheet the rubber and let it stand for 24 hours to eliminate internal stress and obtain modified EPDM rubber.

[0022] In step B1, the ratio of high-viscosity hydroxyl-terminated polydimethylsiloxane, low-viscosity polydimethylsiloxane, tetrahydroxydiborane, and methanol is 25-50g: 25-50g: 0.5-1g: 40-80mL.

[0023] As a further aspect of the present invention: the CAS number of the high-viscosity hydroxyl-terminated polydimethylsiloxane mentioned in step B1 is 70131-67-8; the model number of the low-viscosity polydimethylsiloxane is IOTA-201-1.

[0024] As a further embodiment of the present invention: the ratio of EPDM rubber, boron-grafted polyborosiloxane, magnesium oxide, 2-thiol-benzimidazole zinc salt, carbon black, paraffin oil, 2,2′-dibenzothiazole disulfide, and sulfur in step B2 is 60-120g: 15-20g: 3-6g: 1.2-2.4g: 9-18g: 9-18g: 0.3-0.6g: 0.3-0.6g.

[0025] As a further aspect of the present invention: the EPDM rubber mentioned in step B2 is of type EPDM5601.

[0026] As a further aspect of the present invention: a method for preparing impact-resistant and crack-resistant ski turf, comprising the following steps:

[0027] Step 1: Add the composite polypropylene to a twin-screw extruder, melt extrude, draw and shape it to obtain artificial grass fibers;

[0028] Step 2: Cut the artificial grass fibers to a height of 3-6cm. Use an artificial turf base fabric weaving machine to weave the artificial grass fibers onto polyester filament nonwoven fabric in a tufted weaving manner. The weaving density is 38,000-110,000 tufts / square meter, and the denier is controlled within the range of 3,000-16,000D.

[0029] Step 3: Apply PU adhesive evenly to the polyester filament nonwoven fabric surface and use heating equipment to cure the PU adhesive;

[0030] Step 4: Add the modified EPDM rubber and softener to the mixer, melt them, and then coat them evenly onto the PU rubber base. Cool and solidify to obtain artificial ski turf.

[0031] The beneficial effects of this invention are:

[0032] By adding modified epoxy resin as a toughening agent to polypropylene resin blended with ethylene-vinyl acetate copolymer, a composite polypropylene resin was obtained, which improved the impact resistance and tear resistance of the polypropylene resin, and thus improved the impact resistance and tear resistance of the composite polypropylene resin as artificial grass fibers. Boron-grafted polyborosiloxane was used to modify EPDM rubber, which improved the degree of crosslinking of EPDM rubber, enhanced its tensile strength and tear resistance, and improved its tensile properties as a rubber buffer layer.

[0033] Diallyl bisphenol A and epichlorohydrin undergo a ring-opening reaction catalyzed by tetramethylammonium bromide, followed by a ring-closure reaction under alkaline conditions to obtain an allyl epoxy resin. A mercapto-alkene click reaction is then carried out between the allyl group and the mercapto group in octadecyl mercaptan to obtain an epoxy resin containing flexible side chains. The introduction of flexible side chains improves the toughness and impact resistance of the epoxy resin. Polypropylene is blended with ethylene-vinyl acetate copolymer, which is distributed as a dispersed phase in the polypropylene matrix and physically entangled with the polypropylene molecular chains. The formation of a network structure can induce yielding deformation in the polypropylene matrix, improving the toughness of polypropylene. Polypropylene blended with ethylene-vinyl acetate copolymer is mixed with a toughening agent. Polypropylene and epoxy resin are blended with maleic anhydride compatibilizer to improve the impact resistance and tear resistance of the material. EPDM rubber is blended with boron-grafted polyborosiloxane to introduce -BO- bonds into EPDM rubber, giving it excellent impact resistance and improving the impact resistance and tear resistance of artificial ski turf. Attached Figure Description

[0034] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0035] Figure 1 This is a schematic diagram showing the changes in impact strength of Embodiments 1-3 and Comparative Examples 1-3 at 25°C and -5°C.

[0036] Figure 2 This is a schematic diagram showing the changes in the tensile property curves of Examples 1-3 and Comparative Examples 1-3 of the present invention.

[0037] Figure 3 This is a schematic diagram showing the changes in tear performance curves of Embodiments 1-3 and Comparative Examples 1-3 of the present invention. Detailed Implementation

[0038] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0039] Example 1:

[0040] This embodiment describes an impact-resistant and crack-resistant ski turf and its preparation method, including the following steps:

[0041] Step S1: Add 0.05 mol 2,2′-diallylbisphenol A, 0.1 mol epichlorohydrin and 1 mol tetramethylammonium bromide to a three-necked flask equipped with a stirrer and thermometer. React for 10 min at a stirring rate of 100 r / min. Add 1.5 g potassium hydroxide and react for 20 min at a temperature of 50 °C. After the reaction, add 50 mL dilute hydrochloric acid to neutralize. Wash three times with water and filter to obtain allylbisphenol A type epoxy resin.

[0042] Step S2: Add 50g of allyl bisphenol A type epoxy resin, 100g of octadecyl mercaptan and 0.1g of 2-hydroxy-2-methylphenylacetone photoinitiator to a single-necked flask, mix well, place the single-necked flask in a UV-LED ultraviolet light source irradiation environment, and react for 4h to obtain epoxy resin with flexible side chains.

[0043] Step S3: Add 50g of polypropylene, 12.5g of ethylene-vinyl acetate copolymer and 0.14g of maleic anhydride grafted polypropylene to a two-roll mill and mix for 3 minutes at a temperature of 180℃ and a speed of 60r / min. The product is then discharged to obtain EVA polypropylene mixed granules.

[0044] Step S4: Add 10g of epoxy resin with flexible side chains, 40g of EVA polypropylene mixed granules and 5g of maleic anhydride grafted polypropylene to a high-speed mixer and mix for 3 minutes. Add the stirred mixture to a twin-screw extruder and melt-blend for 5 minutes at a temperature of 190℃ and a speed of 50 rpm. Add 2.5g of 2-ethyl-4-methylimidazole and continue mixing. After mixing, extrude and granulate to obtain composite polypropylene resin.

[0045] Step S5: Add 25g of high-viscosity hydroxyl-terminated polydimethylsiloxane and 25g of low-viscosity polydimethylsiloxane to a vacuum kneader, stir evenly for 2 hours at 24°C, add 0.5g of tetrahydroxydiborane, then add 40mL of methanol, raise the temperature to 80°C, evacuate for 5 hours, and cool to obtain boron-grafted polyborosiloxane.

[0046] Step S6: Add 60g of EPDM rubber to the mixing chamber and mix for 1 minute at 60℃ and 30r / min. Add 15g of boron-grafted polyborosiloxane and continue mixing for 1 minute. After mixing, add 3g of magnesium oxide, 1.2g of 2-thiol-benzimidazole zinc salt, 9g of carbon black and 9g of paraffin oil, and continue mixing for 5 minutes. Cool the temperature to 70℃, add 0.3g of 2,2′-disulfide dibenzothiazole and 0.3g of sulfur, and continue mixing for 1 minute. After discharging the rubber, add the masterbatch to a two-roll mill and roll it into a triangular shape 6 times. Adjust the gap between the two rolls to 4mm, and pass it through a thin mill 10 times. After uniform mixing, sheet the rubber and let it stand for 24 hours to eliminate internal stress and obtain modified EPDM rubber.

[0047] Step S7: Add the composite polypropylene to a twin-screw extruder, melt extrude, draw and shape it to obtain artificial grass fibers;

[0048] Step S8: Cut the artificial grass fibers to a height of 3-6cm. Use an artificial turf base fabric weaving machine to weave the artificial grass fibers onto polyester filament nonwoven fabric in a tufted weaving manner. The weaving density is 38,000-110,000 tufts / square meter, and the denier is controlled in the range of 3,000-16,000D.

[0049] Step S9: Apply PU adhesive evenly to the polyester filament nonwoven fabric surface and use heating equipment to cure the PU adhesive;

[0050] Step S10: Add the modified EPDM rubber and softener to the mixer, melt them, and then coat them evenly on the PU rubber base. Cool and solidify to obtain artificial ski turf.

[0051] Example 2:

[0052] This embodiment describes an impact-resistant and crack-resistant ski turf and its preparation method, including the following steps:

[0053] Step S1: Add 0.075 mol 2,2′-diallylbisphenol A, 0.15 mol epichlorohydrin and 1.5 mol tetramethylammonium bromide to a three-necked flask equipped with a stirrer and thermometer. React for 15 min at a stirring rate of 150 r / min. Add 2.15 g potassium hydroxide and react for 25 min at a temperature of 60 °C. After the reaction, add 75 mL dilute hydrochloric acid to neutralize. Wash three times with water and filter to obtain allylbisphenol A type epoxy resin.

[0054] Step S2: Add 75g of allyl bisphenol A type epoxy resin, 150g of octadecyl mercaptan and 0.15g of 2-hydroxy-2-methylphenylacetone photoinitiator to a single-necked flask, mix well, place the single-necked flask in a UV-LED ultraviolet light source irradiation environment, and react for 4.5h to obtain epoxy resin with flexible side chains.

[0055] Step S3: Add 75g of polypropylene, 18.75g of ethylene-vinyl acetate copolymer and 0.215g of maleic anhydride grafted polypropylene into a two-roll mill and mix for 3.5min at a temperature of 200℃ and a speed of 65r / min. The product is then discharged to obtain EVA polypropylene mixed granules.

[0056] Step S4: Add 12.5g of epoxy resin with flexible side chains, 50g of EVA polypropylene mixed granules, and 7.5g of maleic anhydride grafted polypropylene to a high-speed mixer and mix for 4 minutes. Add the stirred mixture to a twin-screw extruder and melt-blend for 7 minutes at a temperature of 195℃ and a speed of 75 rpm. Add 3.75g of 2-ethyl-4-methylimidazole and continue mixing. After mixing, extrude and granulate to obtain composite polypropylene resin.

[0057] Step S5: Add 37.5g of high-viscosity hydroxyl-terminated polydimethylsiloxane and 37.5g of low-viscosity polydimethylsiloxane to a vacuum kneader, stir evenly for 2.5h at 25℃, add 0.75g of tetrahydroxydiborane, then add 60mL of methanol, raise the temperature to 90℃, evacuate for 5.5h, and cool to obtain boron-grafted polyborosiloxane;

[0058] Step S6: Add 90g of EPDM rubber to the mixing chamber and mix for 1.5min at 65℃ and 30r / min. Add 17.5g of boron-grafted polyborosiloxane and continue mixing for 1.5min. After mixing, add 4.5g of magnesium oxide, 1.8g of 2-mercaptobenzimidazole zinc salt, 13.5g of carbon black and 13.5g of paraffin oil, and continue mixing for 6min. Cool the temperature to 75℃, add 0.45g of 2,2′-dibenzothiazole disulfide and 0.45g of sulfur, and continue mixing for 1.5min. Discharge the rubber and add the masterbatch to a two-roll mill. Bring the masterbatch to a triangular shape 6 times, adjust the gap between the two rolls to 4mm, and pass through a thin mill 10 times. After uniform mixing, sheet the rubber and let it stand for 24h to eliminate internal stress and obtain modified EPDM rubber.

[0059] Step S7: Add the composite polypropylene to a twin-screw extruder, melt extrude, draw and shape it to obtain artificial grass fibers;

[0060] Step S8: Cut the artificial grass fibers to a height of 3-6cm. Use an artificial turf base fabric weaving machine to weave the artificial grass fibers onto polyester filament nonwoven fabric in a tufted weaving manner. The weaving density is 38,000-110,000 tufts / square meter, and the denier is controlled in the range of 3,000-16,000D.

[0061] Step S9: Apply PU adhesive evenly to the polyester filament nonwoven fabric surface and use heating equipment to cure the PU adhesive;

[0062] Step S10: Add the modified EPDM rubber and softener to the mixer, melt them, and then coat them evenly on the PU rubber base. Cool and solidify to obtain artificial ski turf.

[0063] Example 3:

[0064] This embodiment describes an impact-resistant and crack-resistant ski turf and its preparation method, including the following steps:

[0065] Step S1: 0.1 mol 2,2′-diallylbisphenol A, 0.2 mol epichlorohydrin and 2 mol tetramethylammonium bromide were added to a three-necked flask equipped with a stirrer and a thermometer. The mixture was stirred at 200 r / min for 20 min. 2.8 g potassium hydroxide was added and the mixture was stirred at 80 °C for 30 min. After the reaction, 100 mL of dilute hydrochloric acid was added to neutralize the mixture. The mixture was washed four times with water and filtered to obtain allylbisphenol A type epoxy resin.

[0066] Step S2: Add 100g of allyl bisphenol A type epoxy resin, 200g of octadecyl mercaptan and 0.2g of 2-hydroxy-2-methylphenylacetone photoinitiator to a single-necked flask, mix well, place the single-necked flask in a UV-LED ultraviolet light source irradiation environment, and react for 5h to obtain epoxy resin with flexible side chains.

[0067] Step S3: Add 100g of polypropylene, 25g of ethylene-vinyl acetate copolymer and 0.29g of maleic anhydride grafted polypropylene to a two-roll mill and mix for 4 minutes at a temperature of 220℃ and a speed of 70r / min. The resulting material is EVA polypropylene mixed granules.

[0068] Step S4: Add 15g of epoxy resin with flexible side chains, 60g of EVA polypropylene mixed granules and 10g of maleic anhydride grafted polypropylene to a high-speed mixer and mix for 5 minutes. Add the stirred mixture to a twin-screw extruder and melt-blend for 10 minutes at a temperature of 200℃ and a speed of 100 rpm. Add 5g of 2-ethyl-4-methylimidazole and continue mixing. After mixing, extrude and granulate to obtain composite polypropylene resin.

[0069] Step S5: Add 50g of high-viscosity hydroxyl-terminated polydimethylsiloxane and 50g of low-viscosity polydimethylsiloxane to a vacuum kneader, stir evenly for 3 hours at 26°C, add 1g of tetrahydroxydiborane, then add 80mL of methanol, raise the temperature to 100°C, evacuate for 6 hours, and cool to obtain boron-grafted polyborosiloxane.

[0070] Step S6: Add 120g of EPDM rubber to the mixing chamber and mix for 2 minutes at 70℃ and 30r / min. Add 20g of boron-grafted polyborosiloxane and continue mixing for 2 minutes. After mixing, add 6g of magnesium oxide, 2.4g of 2-thiol-benzimidazole zinc salt, 18g of carbon black and 18g of paraffin oil, and continue mixing for 7 minutes. Cool the temperature to 80℃, add 0.6g of 2,2′-disulfide dibenzothiazole and 0.6g of sulfur, and continue mixing for 2 minutes. After discharging the rubber, add the masterbatch to a two-roll mill and roll it into a triangular shape 6 times. Adjust the gap between the two rolls to 4mm, and pass it through a thin mill 10 times. After uniform mixing, sheet the rubber and let it stand for 24 hours to eliminate internal stress and obtain modified EPDM rubber.

[0071] Step S7: Add the composite polypropylene to a twin-screw extruder, melt extrude, draw and shape it to obtain artificial grass fibers;

[0072] Step S8: Cut the artificial grass fibers to a height of 3-6cm. Use an artificial turf base fabric weaving machine to weave the artificial grass fibers onto polyester filament nonwoven fabric in a tufted weaving manner. The weaving density is 38,000-110,000 tufts / square meter, and the denier is controlled in the range of 3,000-16,000D.

[0073] Step S9: Apply PU adhesive evenly to the polyester filament nonwoven fabric surface and use heating equipment to cure the PU adhesive;

[0074] Step S10: Add the modified EPDM rubber and softener to the mixer, melt them, and then coat them evenly on the PU rubber base. Cool and solidify to obtain artificial ski turf.

[0075] Comparative Example 1:

[0076] This comparative example describes an impact-resistant and crack-resistant ski turf and its preparation method, including the following steps:

[0077] Step S1: Add polypropylene to a twin-screw extruder, melt extrude, draw and shape it to obtain artificial grass fibers;

[0078] Step S2: Cut the artificial grass fibers to a height of 3-6cm. Use an artificial turf base fabric weaving machine to weave the artificial grass fibers onto polyester filament nonwoven fabric in a tufted weaving manner. The weaving density is 38,000-110,000 tufts / square meter, and the denier is controlled in the range of 3,000-16,000D.

[0079] Step S3: Apply PU adhesive evenly to the polyester filament nonwoven fabric surface and use heating equipment to cure the PU adhesive;

[0080] Step S4: Add EPDM rubber and softener to a mixer to melt and then coat it evenly onto the PU rubber base. Cool and solidify to obtain artificial ski turf.

[0081] Comparative Example 2:

[0082] This comparative example describes an impact-resistant and crack-resistant ski turf and its preparation method, including the following steps:

[0083] Step S1: 0.1 mol 2,2′-diallylbisphenol A, 0.2 mol epichlorohydrin and 2 mol tetramethylammonium bromide were added to a three-necked flask equipped with a stirrer and a thermometer. The mixture was stirred at 200 r / min for 20 min. 2.8 g potassium hydroxide was added and the mixture was stirred at 80 °C for 30 min. After the reaction, 100 mL of dilute hydrochloric acid was added to neutralize the mixture. The mixture was washed four times with water and filtered to obtain allylbisphenol A type epoxy resin.

[0084] Step S2: Add 100g of allyl bisphenol A type epoxy resin, 200g of octadecyl mercaptan and 0.2g of 2-hydroxy-2-methylphenylacetone photoinitiator to a single-necked flask, mix well, place the single-necked flask in a UV-LED ultraviolet light source irradiation environment, and react for 5h to obtain epoxy resin with flexible side chains.

[0085] Step S3: Add 100g of polypropylene, 25g of ethylene-vinyl acetate copolymer and 0.29g of maleic anhydride grafted polypropylene to a two-roll mill and mix for 4 minutes at a temperature of 220℃ and a speed of 70r / min. The resulting material is EVA polypropylene mixed granules.

[0086] Step S4: Add 15g of epoxy resin with flexible side chains, 60g of EVA polypropylene mixed granules and 10g of maleic anhydride grafted polypropylene to a high-speed mixer and mix for 5 minutes. Add the stirred mixture to a twin-screw extruder and melt-blend for 10 minutes at a temperature of 200℃ and a speed of 100 rpm. Add 5g of 2-ethyl-4-methylimidazole and continue mixing. After mixing, extrude and granulate to obtain composite polypropylene resin.

[0087] Step S5: Add the composite polypropylene resin to a twin-screw extruder, melt extrude, draw and shape it to obtain artificial grass fibers;

[0088] Step S6: Cut the artificial grass fibers to a height of 3-6cm. Use an artificial turf base fabric weaving machine to weave the artificial grass fibers onto polyester filament nonwoven fabric in a tufted weaving manner. The weaving density is 38,000-110,000 tufts / square meter, and the denier is controlled in the range of 3,000-16,000D.

[0089] Step S7: Apply PU adhesive evenly to the polyester filament nonwoven fabric surface and use heating equipment to cure the PU adhesive;

[0090] Step S8: Add EPDM rubber and softener to a mixer to melt and then coat it evenly onto the PU rubber base. Cool and solidify to obtain artificial ski turf.

[0091] Comparative Example 3:

[0092] This comparative example describes an impact-resistant and crack-resistant ski turf and its preparation method, including the following steps:

[0093] Step S1: Add 50g of high-viscosity hydroxyl-terminated polydimethylsiloxane and 50g of low-viscosity polydimethylsiloxane to a vacuum kneader, stir evenly for 3 hours at 26°C, add 1g of tetrahydroxydiborane, then add 80mL of methanol, raise the temperature to 100°C, evacuate for 6 hours, and cool to obtain boron-grafted polyborosiloxane.

[0094] Step S2: Add 120g of EPDM rubber to the mixing chamber and mix for 2 minutes at 70℃ and 30r / min. Add 20g of boron-grafted polyborosiloxane and continue mixing for 2 minutes. After mixing, add 6g of magnesium oxide, 2.4g of 2-thiol-benzimidazole zinc salt, 18g of carbon black and 18g of paraffin oil, and continue mixing for 7 minutes. Cool the temperature to 80℃, add 0.6g of 2,2′-disulfide dibenzothiazole and 0.6g of sulfur, and continue mixing for 2 minutes. After discharging the rubber, add the masterbatch to a two-roll mill and roll it into a triangular shape 6 times. Adjust the gap between the two rolls to 4mm, and pass it through a thin mill 10 times. After uniform mixing, sheet the rubber and let it stand for 24 hours to eliminate internal stress and obtain modified EPDM rubber.

[0095] Step S3: Add polypropylene to a twin-screw extruder, melt extrude, draw and shape it to obtain artificial grass fibers;

[0096] Step S4: Cut the artificial grass fibers to a height of 3-6cm. Use an artificial turf base fabric weaving machine to weave the artificial grass fibers onto polyester filament nonwoven fabric in a tufted weaving manner. The weaving density is 38,000-110,000 tufts / square meter, and the denier is controlled in the range of 3,000-16,000D.

[0097] Step S5: Apply PU adhesive evenly to the polyester filament nonwoven fabric surface and use heating equipment to cure the PU adhesive;

[0098] Step S6: Add the modified EPDM rubber and softener to the mixer, melt them, and then coat them evenly on the PU rubber base. Cool and solidify to obtain artificial ski turf.

[0099] See Figure 1The composite polypropylene of Examples 1-3 and Comparative Examples 1-3 were placed in a flat vulcanizing apparatus and pressed into sheets. Then, they were placed on a cold press to maintain pressure and cool and solidify into 2mm test pieces. The samples were fixed on a pendulum impact testing machine and impact tests were conducted at 25℃ and -5℃ respectively to obtain the impact strength.

[0100] See Figure 2-3 The EPDM rubber samples from Examples 1-3 and Comparative Examples 1-3 were placed in a flat vulcanizing apparatus and pressed into sheets. These sheets were then placed in a cold press and cooled to solidify into 2mm test pieces. Tensile strength was obtained by testing with an electronic tensile testing machine according to GB / T528-2009 at a tensile speed of 500 nm / min. Tear strength was obtained by testing with a tensile speed of 500 nm / min according to GB / T529-2008.

[0101] See Figure 1-3 As shown, based on the comparison between Examples 1-3 and Comparative Examples 1-3, it can be seen that adding epoxy resin and polypropylene blends and modifying EPDM rubber can improve the impact resistance and tear resistance of ski turf.

[0102] Based on the comparison between Example 3 and Comparative Example 1, it can be seen that the impact resistance of the modified EPDM rubber with epoxy resin and polypropylene is better than that of ordinary polypropylene and EPDM rubber, indicating that the modified EPDM rubber with epoxy resin and polypropylene has excellent impact resistance.

[0103] Based on the comparison between Example 3 and Comparative Example 2, it can be seen that the impact resistance of the modified EPDM rubber with epoxy resin and polypropylene blend is better than that of the ordinary EPDM rubber with epoxy resin and polypropylene blend. This indicates that the modified EPDM rubber with epoxy resin and polypropylene blend has excellent impact resistance.

[0104] Based on the comparison between Example 3 and Comparative Example 3, it can be seen that the impact resistance of the modified EPDM rubber with epoxy resin and polypropylene is better than that of ordinary polypropylene with modified EPDM rubber, indicating that the modified EPDM rubber with epoxy resin and polypropylene has excellent impact resistance.

[0105] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0106] The above description is merely an example and illustration of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the invention or exceed the scope defined in this application, they should all fall within the protection scope of the present invention.

Claims

1. An impact-resistant and crack-resistant ski turf, characterized in that, include: The artificial grass fibers consist of a lawn base fabric, tufted artificial grass fibers on the lawn base fabric, an adhesive backing layer coated on the back of the lawn base fabric, and a rubber cushioning layer coated on the back of the adhesive backing layer. The height of the artificial grass fibers is in the range of 3-6cm, the weaving density is 38,000-110,000 tufts / square meter, and the denier is controlled in the range of 3,000-16,000D. The lawn base fabric is made of polyester filament nonwoven fabric, the artificial grass fibers are made of composite polypropylene, the backing layer is made of PU adhesive, and the rubber buffer layer is made of modified EPDM rubber. The composite polypropylene is prepared by the following steps: Step A1: 2,2′-diallylbisphenol A, epichlorohydrin and tetramethylammonium bromide are stirred and reacted, then potassium hydroxide is added to react, dilute hydrochloric acid is added to neutralize after the reaction, washed with water and filtered to obtain allylbisphenol A type epoxy resin. Step A2: Mix allyl bisphenol A type epoxy resin, octadecyl mercaptan and 2-hydroxy-2-methylphenylacetone photoinitiator evenly, place the flask in a UV-LED ultraviolet light source irradiation environment to react, and obtain epoxy resin with flexible side chain. Step A3: Add polypropylene, ethylene-vinyl acetate copolymer and maleic anhydride grafted polypropylene into a two-roll mill and mix them to obtain EVA polypropylene mixed granules. Step A4: Add the flexible side-chain epoxy resin, EVA polypropylene mixed particles and maleic anhydride grafted polypropylene to a high-speed mixer and mix. Add the stirred mixture to a twin-screw extruder for melt blending. Add 2-ethyl-4-methylimidazole and continue mixing. After mixing, extrude and granulate to obtain composite polypropylene resin.

2. The impact-resistant and crack-resistant ski turf according to claim 1, characterized in that, In step A1, the ratio of 2,2′-diallylbisphenol A, epichlorohydrin, tetramethylammonium bromide, potassium hydroxide, and dilute hydrochloric acid is 0.05-0.1 mol: 0.1-0.2 mol: 1-2 mol: 1.5-2.8 g: 50-100 mL; the concentration of the dilute hydrochloric acid is 0.5 mol / L.

3. The impact-resistant and crack-resistant ski turf according to claim 1, characterized in that, In step A2, the ratio of allyl bisphenol A type epoxy resin, octadecyl mercaptan, and 2-hydroxy-2-methylphenylacetone photoinitiator is 50-100g: 100-200g: 0.1-0.2g; the wavelength of the UV-LED ultraviolet light source is 365nm.

4. The impact-resistant and crack-resistant ski turf according to claim 1, characterized in that, In step A3, the ratio of polypropylene, ethylene-vinyl acetate copolymer, and maleic anhydride-grafted polypropylene is 50-100g: 12.5-25g: 0.14-0.29g; the polypropylene is of type RA140E; the ethylene-vinyl acetate copolymer is of type VC640; and the maleic anhydride-grafted polypropylene is of type QB510.

5. The impact-resistant and crack-resistant ski turf according to claim 1, characterized in that, In step A4, the ratio of the flexible side-chain epoxy resin, EVA polypropylene blend particles, maleic anhydride-grafted polypropylene, and 2-ethyl-4-methylimidazole is 10-15g: 40-60g: 5-10g: 2.5-5g; the maleic anhydride-grafted polypropylene is of type QB510.

6. The impact-resistant and crack-resistant ski turf according to claim 1, characterized in that, The modified EPDM rubber is prepared by the following steps: Step B1: Add high-viscosity hydroxyl-terminated polydimethylsiloxane and low-viscosity polydimethylsiloxane to a vacuum kneader and stir evenly. Add tetrahydroxydiborane and methanol. Vacuum and cool to obtain boron-grafted polyborosiloxane. Step B2: Add EPDM rubber to the internal mixing chamber and mix. Add boron-grafted polyborosiloxane and continue mixing. After the mixing is complete, add magnesium oxide, 2-thiol-based benzimidazole zinc salt, carbon black and paraffin oil and continue mixing. After cooling, add 2,2′-dibenzothiazole disulfide and sulfur, continue mixing and discharge the rubber. Add the masterbatch to a two-roll mill and form a triangular roll. Adjust the gap between the two rolls, pass through a thin sheet, and after uniformity, sheet it. Let it stand for 24 hours to eliminate internal stress and obtain modified EPDM rubber.

7. The impact-resistant and crack-resistant ski turf according to claim 6, characterized in that, In step B1, the ratio of high-viscosity hydroxyl-terminated polydimethylsiloxane, low-viscosity polydimethylsiloxane, tetrahydroxydiborane, and methanol is 25-50g: 25-50g: 0.5-1g: 40-80mL; the CAS number of the high-viscosity hydroxyl-terminated polydimethylsiloxane is 70131-67-8; and the model of the low-viscosity polydimethylsiloxane is IOTA-201-1.

8. The impact-resistant and crack-resistant ski turf according to claim 6, characterized in that, In step B2, the ratio of EPDM rubber, boron-grafted polyborosiloxane, magnesium oxide, 2-thiol-benzimidazole zinc salt, carbon black, paraffin oil, 2,2′-dibenzothiazole disulfide, and sulfur is 60-120g: 15-20g: 3-6g: 1.2-2.4g: 9-18g: 9-18g: 0.3-0.6g: 0.3-0.6g; the EPDM rubber is of type EPDM5601.

9. A method for preparing impact-resistant and crack-resistant ski turf as described in any one of claims 1-8, characterized in that, Includes the following steps: Step 1: Add the composite polypropylene to a twin-screw extruder, melt extrude, draw and shape it to obtain artificial grass fibers; Step 2: Cut the artificial grass fibers to a height of 3-6cm. Use an artificial turf base fabric weaving machine to weave the artificial grass fibers onto polyester filament nonwoven fabric in a tufted weaving manner. The weaving density is 38,000-110,000 tufts / square meter, and the denier is controlled within the range of 3,000-16,000D. Step 3: Apply PU adhesive evenly to the polyester filament nonwoven fabric surface and use heating equipment to cure the PU adhesive; Step 4: Add the modified EPDM rubber and softener to the mixer, melt them, and then coat them evenly onto the PU rubber base. Cool and solidify to obtain artificial ski turf.

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