Integrally recyclable artificial turf and preparation method thereof

Abstract

The invention discloses an integrally recyclable artificial turf and a preparation method thereof, and belongs to the technical field of artificial turfs. The integrally recoverable artificial turf comprises artificial grass and composite base cloth, and the composite base cloth comprises base cloth A for fixing the grass, gridding cloth, base cloth B at the bottom of the turf and polyurethane hot melt adhesive for adhering the base cloth A, the gridding cloth and the base cloth B together; the base cloth A is a PET non-woven fabric subjected to single-side hydrophilic treatment by adopting a hydrophilic finishing agent; the polyurethane hot melt adhesive is prepared by compounding rosin-based polyol, an isocyanate monomer, 1, 4-butanediol and polytetrahydrofuran, and the rosin-based polyol, the isocyanate monomer, the 1, 4-butanediol and the polytetrahydrofuran are compounded to obtain the polyurethane hot melt adhesive. The integrally recyclable artificial turf prepared by the invention is firm in combination and can quickly drain water.

Description

Technical Field

[0001] This invention relates to the field of artificial turf technology, specifically to a fully recyclable artificial turf and its preparation method. Background Technology

[0002] Artificial turf has gained widespread use in recent years due to its superior performance and significant advantages over natural grass, such as lower price and easier maintenance. Initially used primarily in professional sports fields like football stadiums, it has gradually expanded to various sports including tennis, basketball, and hockey. Its long lifespan, weather resistance, and ability to provide a near-natural grass experience greatly satisfy the needs of sports enthusiasts. With technological advancements and diversified market demands, the application of artificial turf is no longer limited to traditional sports but is rapidly extending to leisure and entertainment spaces. Landscape artificial turf is widely used in courtyards, gardens, hotels, supermarkets, and other places, gradually integrating it into people's daily lives.

[0003] However, with the continuous expansion of the application scope of artificial turf, users have placed higher demands on its comprehensive performance, among which environmental protection has become a core issue that urgently needs to be addressed. On the one hand, the materials used in all components of the turf, including grass fibers, backing fabric, and adhesive, must meet environmental standards to avoid potential harm to the environment and human health. On the other hand, against the backdrop of increasingly scarce global resources and the prominent issue of energy depletion, the recyclability and recycling capacity of materials are receiving increasing attention. The 2014 AMI technical report clearly pointed out that the recycling and reuse of artificial turf will become an important future development direction for the industry. Under this trend, developing an entirely recyclable artificial turf not only meets the strategic needs of sustainable development but also becomes a key breakthrough for enterprises to enhance their product competitiveness.

[0004] Most artificial turf currently on the market uses a multi-layered composite structure, typically composed of polyolefin grass fibers, polyester or polypropylene backing fabric, and thermosetting adhesives. Existing products suffer from insufficient bonding strength between the grass fibers and the backing fabric, leading to problems such as fraying and bubbling, which affects their lifespan. Furthermore, traditional adhesive backing processes often clog the pores of the backing fabric, limiting drainage performance and failing to meet the actual needs of high-intensity use or rainy areas.

[0005] Therefore, there is an urgent need to develop a fully recyclable artificial turf with both excellent bonding strength and good drainage capacity, as well as its preparation method. Summary of the Invention

[0006] The purpose of this invention is to provide a fully recyclable artificial turf and its preparation method to solve the technical problems mentioned in the background section.

[0007] The technical solution to achieve the objective of this invention is: In a first aspect, the present invention provides an integrally recyclable artificial turf, comprising artificial grass fibers and a composite base fabric; the composite base fabric comprises a base fabric A for fixing the artificial grass fibers, a mesh fabric, a base fabric B at the bottom of the turf, and a polyurethane hot melt adhesive powder for bonding the base fabric A, the mesh fabric, and the base fabric B together.

[0008] Furthermore, the base fabric A is a nonwoven fabric that has undergone unilateral hydrophilic treatment using a hydrophilic finishing agent.

[0009] Furthermore, the hydrophilic finishing agent is obtained by reacting aminated chitosan with gallic acid.

[0010] Furthermore, the polyurethane hot melt adhesive powder is obtained by compounding rosin-based polyol, isocyanate monomer, 1,4-butanediol, and polytetrahydrofuran.

[0011] In a second aspect, the present invention provides a method for preparing a monolithically recyclable artificial turf as described in the first aspect, the preparation steps including: (1) Lay a mesh of the same size on the side of the base fabric A that has not been hydrophilically treated, then sprinkle polyurethane hot melt adhesive powder evenly on the mesh, and then heat it to melt the polyurethane hot melt adhesive powder to bond the base fabric A and the mesh to the mesh to obtain a pre-composite base fabric. (2) Tuft artificial grass fibers onto the pre-composite base fabric, with the mesh side facing down during the composite process; (3) The base fabric B is attached to the mesh surface of the material obtained in step (2), and the base fabric B is heated by a heating roller to bond the material obtained in step (2) together.

[0012] Further, the preparation steps of the base fabric A are as follows: 0.1-1 parts by mass of alkyl glycoside are added to 100 parts by mass of hydrophilic finishing agent, and then the mixture is stirred and foamed at 2000-3000 r / min for 2-4 min. The resulting foam is then mixed at a concentration of 5-10 g / m³. 2 The amount of coating is evenly applied to one side of the nonwoven fabric, dried at 55~65℃, cured at 160~180℃ for 55~65s, and then washed and dried to obtain base fabric A.

[0013] Further, the preparation steps of the hydrophilic finishing agent are as follows: Aminated chitosan and gallic acid are mixed and dissolved in deionized water at a mass ratio of (3~5):1, which is 5~10 times the mass of the aminated chitosan. Then the pH of the solution is adjusted to 4.5~5.5, and the mixture is stirred at room temperature for 8~12 hours to obtain the hydrophilic finishing agent.

[0014] Further, the preparation steps of the polyurethane hot melt adhesive powder are as follows: 2.55 parts by weight of dried polytetrahydrofuran, 0.08-0.12 parts by weight of catalyst dibutyltin dilaurate, and 10-14 parts by weight of N,N-dimethylacetamide are stirred and mixed for 1-2 hours to obtain mixture A; 1.3-1.5 parts by weight of isocyanate monomer are dissolved in 10-14 parts by weight of N,N-dimethylacetamide and added dropwise to mixture A, stirred at 78-82°C for 2-4 hours, then cooled to 70°C, and 10-14 parts by weight of N,N-dimethylacetamide containing 1.8-2 parts by weight of rosin-based polyol and 0.07-0.09 parts by weight of 1,4-butanediol are added dropwise, the reaction is continued for 7-9 hours, and then dried and cured at 78-82°C for 24 hours, and then crushed and ground through a 20-100 mesh sieve to obtain polyurethane hot melt adhesive powder.

[0015] Further, the preparation steps of the rosin-based polyol are as follows: under nitrogen protection, 300 parts by mass of rosin are heated to 155~200℃ to melt, then 300~310 parts by mass of tung oil acid are added, and after reacting for 4~6 hours, 0.6 parts by mass of zinc oxide are added, and 223~298 parts by mass of triethanolamine are added dropwise. Then, the temperature is raised to 180~220℃ within 1 hour and reacted for 7~9 hours to obtain the rosin-based polyol.

[0016] Furthermore, the speed of the heating roller is 0.1~5m / min, and the heating temperature is 80~120℃.

[0017] By adopting the above technical solution, the present invention has the following beneficial effects: (1) The recyclable artificial turf prepared by the present invention includes artificial grass fibers and composite base fabric; the composite base fabric includes base fabric A for fixing artificial grass fibers, mesh fabric, base fabric B at the bottom of the turf, and polyurethane hot melt adhesive powder for bonding base fabric A, mesh fabric and base fabric B together, and the recyclable artificial turf prepared by the present invention has high bonding strength and good drainage.

[0018] (2) The polyurethane hot melt adhesive powder of the present invention is obtained by compounding rosin-based polyol, isocyanate monomer, 1,4-butanediol and polytetrahydrofuran. The rosin-based polyol is obtained by grafting rosin and tung oil acid through DA reaction and then reacting with triethanolamine to form a multifunctional rosin-based polyol containing at least three hydroxyl groups. Then, the rosin polyol, 1,4-butanediol, polytetrahydrofuran and isocyanate monomer are polymerized to generate a branched polyurethane hot melt adhesive powder with rosin-based polyol as the branching center, which significantly enhances the crosslinking density and cohesive strength between molecules, thereby effectively improving the adhesive properties of the adhesive powder. At the same time, a micro-nano scale cavity structure is formed during the polymerization process. Since the tung oil acid molecular chain and rosin itself have strong hydrophobic properties, the hydrophobic properties of the cavity are improved.

[0019] (3) The polyurethane hot melt adhesive powder of the present invention uses rosin-based polyols as raw materials. Rosin, as a natural and renewable biomass resource, is widely found in the secretions of pine plants and has biodegradability and low environmental impact. Tung acid, on the other hand, is derived from tung oil and is also a plant-derived unsaturated fatty acid. Neither of these materials relies on fossil resources, effectively reducing dependence on traditional petroleum-based polyols. Therefore, from the source of raw materials to the final product, the polyurethane hot melt adhesive powder of the present invention achieves efficient utilization of renewable resources, significantly improving the environmental compatibility and recyclability of the material while ensuring excellent adhesive performance.

[0020] (4) The base fabric A of the present invention is a nonwoven fabric foamed with alkyl glycosides and then subjected to unilateral hydrophilic treatment using a hydrophilic finishing agent. The hydrophilic finishing agent is obtained by mixing and reacting aminated chitosan and gallic acid. Aminated chitosan, as a natural polysaccharide derivative, has good biocompatibility, film-forming properties and reactivity. Gallic acid is rich in phenolic hydroxyl groups, which can not only form a stable complex with the amino groups of chitosan through Schiff base or hydrogen bonding, but also endow the finishing agent with excellent antioxidant and hydrophilic properties. The two work together to construct an environmentally friendly, non-toxic and harmless hydrophilic functional system, effectively improving the structural stability and durability of base fabric A during long-term use. After foaming with alkyl glycosides as a foaming agent, the foam is applied to one side of the nonwoven fabric, causing the hydrophilic groups to be directionally enriched in the upper layer of the base fabric A, while the lower layer retains its original hydrophobic properties. Thus, the base fabric A, together with the upper mesh fabric and hot melt adhesive composite layer, and the lower base fabric B, form a unidirectional moisture-wicking structure with a "hydrophilic-hydrophobic" gradient distribution from top to bottom. Utilizing capillary pressure difference and surface energy difference, water is rapidly absorbed upon contact with the upper surface and directionally conducted to the lower layer for drainage along the thickness direction, preventing water accumulation or backflow on the surface, thereby significantly improving the drainage efficiency of the overall artificial turf system. At the same time, since the finishing agent used is entirely based on natural biomass raw materials, it is widely available and environmentally friendly. Attached Figure Description

[0021] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein... Figure 1 This is a schematic diagram of the overall recyclable artificial turf structure according to an embodiment of the present invention.

[0022] The labels in the attached diagram are: 2-base fabric A, 3-mesh fabric, 1-artificial grass fiber, 4-base fabric B; Detailed Implementation

[0023] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0026] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0027] In the description of the embodiments of the present invention, it should be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of the present invention and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0028] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances. The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and should not be used to limit the scope of protection of the present invention.

[0029] Both base fabric A and base fabric B use 120g / m² nonwoven fabric. 2 PET nonwoven fabric; the mesh fabric uses 70g / m 2 The PET mesh fabric has a mesh size of 4*4mm; the polytetrahydrofuran (Mn) content is 1000g / mol; and the isocyanate monomer is isoflurane diisocyanate. Example 1

[0030] See Figure 1 A recyclable artificial turf comprises artificial grass fibers 1 and a composite base fabric. The composite base fabric includes a base fabric A2 for fixing the artificial grass fibers, a mesh fabric 3, a base fabric B4 at the bottom of the turf, and polyurethane hot melt adhesive powder for bonding the base fabric A2, mesh fabric 3, and base fabric B4 together. The preparation steps include: (1) Lay a mesh fabric of the same size above the side of the base fabric A that has not been hydrophilically treated, and then apply 150g / m 2 Evenly sprinkle polyurethane hot melt adhesive powder, then heat it to melt the polyurethane hot melt adhesive powder and bond the base fabric A to the mesh fabric to obtain a pre-composite base fabric; (2) Tuft artificial grass fibers onto the pre-composite base fabric, with the mesh side facing down during the composite process; (3) The base fabric B is attached to the mesh surface of the material obtained in step (2), and heated by a heating roller at a speed of 0.1 m / min and a heating temperature of 80°C to bond the base fabric B and the material obtained in step (2) together. Then it is cooled and rolled up.

[0031] The preparation steps of the base fabric A are as follows: 0.1 parts by mass of alkyl glycoside are added to 100 parts by mass of hydrophilic finishing agent, and then the mixture is stirred and foamed at 2000 r / min for 2 min. The resulting foam is then distributed at a concentration of 5 g / m³. 2 The amount of coating is evenly applied to one side of the nonwoven fabric, dried at 55°C, cured at 160°C for 55 seconds, and then washed and dried to obtain base fabric A.

[0032] The preparation steps of the hydrophilic finishing agent are as follows: Aminated chitosan and gallic acid are mixed and dissolved in deionized water at a mass ratio of 3:1, which is 5 times the mass of the aminated chitosan. Then the pH of the solution is adjusted to 4.5, and the mixture is stirred at room temperature for 8 hours to obtain the hydrophilic finishing agent.

[0033] The preparation steps of the polyurethane hot melt adhesive powder are as follows: 2.55 parts by weight of dried polytetrahydrofuran, 0.08 parts by weight of catalyst dibutyltin dilaurate, and 10 parts by weight of N,N-dimethylacetamide are stirred and mixed for 1 hour to obtain mixture A; 1.3 parts by weight of isocyanate monomer are dissolved in 10 parts by weight of N,N-dimethylacetamide and added dropwise to mixture A, stirred at 78°C for 2 hours, then cooled to 70°C, and 10 parts by weight of N,N-dimethylacetamide containing 1.8 parts by weight of rosin-based polyol and 0.07 parts by weight of 1,4-butanediol are added dropwise, the reaction is continued for 7 hours, and then dried and cured at 78°C for 24 hours. Then, the mixture is crushed, ground, and passed through a 20-mesh sieve to obtain polyurethane hot melt adhesive powder.

[0034] The preparation steps of the rosin-based polyol are as follows: Under nitrogen protection, 300 parts by mass of rosin are heated to 155°C to melt, then 300 parts by mass of tung oil acid are added, and after reacting for 4 hours, 0.6 parts by mass of zinc oxide are added, and 223 parts by mass of triethanolamine are added dropwise. Then, the temperature is raised to 180°C within 1 hour and reacted for 7 hours to obtain the rosin-based polyol. Example 2

[0035] An integrally recyclable artificial turf structure is identical to that in Example 1, and the preparation steps include: (1) Lay a mesh fabric of the same size above the side of the base fabric A that has not been hydrophilically treated, and then apply 150g / m 2 Evenly sprinkle polyurethane hot melt adhesive powder, then heat it to melt the polyurethane hot melt adhesive powder and bond the base fabric A to the mesh fabric to obtain a pre-composite base fabric; (2) Tuft artificial grass fibers onto the pre-composite base fabric, with the mesh side facing down during the composite process; (3) The base fabric B is attached to the mesh surface of the material obtained in step (2), and heated by a heating roller at a speed of 3 m / min and a heating temperature of 100°C to bond the base fabric B and the material obtained in step (2) together. Then it is cooled and rolled up.

[0036] The preparation steps of the base fabric A are as follows: 0.3 parts by mass of alkyl glycoside are added to 100 parts by mass of hydrophilic finishing agent, and then the mixture is stirred and foamed at 2000 r / min for 3 min. The resulting foam is then divided into sections at 8 g / m³. 2 The amount of coating is evenly applied to one side of the nonwoven fabric, dried at 60°C, cured at 170°C for 60 seconds, and then washed and dried to obtain base fabric A.

[0037] The preparation steps of the hydrophilic finishing agent are as follows: Aminated chitosan and gallic acid are mixed and dissolved in deionized water at a mass ratio of 4:1, which is 8 times the mass of the aminated chitosan. Then the pH of the solution is adjusted to 5, and the mixture is stirred at room temperature for 10 hours to obtain the hydrophilic finishing agent.

[0038] The preparation steps of the polyurethane hot melt adhesive powder are as follows: 2.55 parts by weight of dried polytetrahydrofuran, 0.1 parts by weight of catalyst dibutyltin dilaurate, and 12 parts by weight of N,N-dimethylacetamide are stirred and mixed for 1.5 h to obtain mixture A; 1.4 parts by weight of isocyanate monomer are dissolved in 12 parts by weight of N,N-dimethylacetamide and added dropwise to mixture A, stirred at 80°C for 3 h, then cooled to 70°C, and 12 parts by weight of N,N-dimethylacetamide containing 1.9 parts by weight of rosin-based polyol and 0.08 parts by weight of 1,4-butanediol are added dropwise, the reaction is continued for 8 h, and then dried and cured at 80°C for 24 h, then crushed, ground, and passed through a 40-mesh sieve to obtain polyurethane hot melt adhesive powder.

[0039] The preparation steps of the rosin-based polyol are as follows: Under nitrogen protection, 302 parts by mass of rosin are heated to 170°C to melt, then 304 parts by mass of tung oil acid are added, and after reacting for 5 hours, 0.6 parts by mass of zinc oxide are added, and 298 parts by mass of triethanolamine are added dropwise. Then, the temperature is raised to 180°C within 1 hour and reacted for 8 hours to obtain the rosin-based polyol. Example 3

[0040] An integrally recyclable artificial turf structure is identical to that in Example 1, and the preparation steps include: (1) Lay a mesh fabric of the same size above the side of the base fabric A that has not been hydrophilically treated, and then apply 150g / m 2 Evenly sprinkle polyurethane hot melt adhesive powder, then heat it to melt the polyurethane hot melt adhesive powder and bond the base fabric A to the mesh fabric to obtain a pre-composite base fabric; (2) Tuft artificial grass fibers onto the pre-composite base fabric, with the mesh side facing down during the composite process; (3) The base fabric B is attached to the mesh surface of the material obtained in step (2), and heated by a heating roller at a speed of 5 m / min and a heating temperature of 120°C to bond the base fabric B and the material obtained in step (2) together. Then it is cooled and rolled up.

[0041] The preparation steps of the base fabric A are as follows: add 1 part by mass of alkyl glycoside to 100 parts by mass of hydrophilic finishing agent, then stir and foam at 3000 r / min for 4 min, and divide the resulting foam into 10 g / m 2 The amount of coating is evenly applied to one side of the nonwoven fabric, dried at 65°C, cured at 180°C for 65 seconds, and then washed and dried to obtain base fabric A.

[0042] The preparation steps of the hydrophilic finishing agent are as follows: Aminated chitosan and gallic acid are mixed and dissolved in deionized water at a mass ratio of 5:1, which is 10 times the mass of the aminated chitosan. Then the pH of the solution is adjusted to 5.5, and the mixture is stirred at room temperature for 12 hours to obtain the hydrophilic finishing agent.

[0043] The preparation steps of the polyurethane hot melt adhesive powder are as follows: 2.55 parts by mass of dried polytetrahydrofuran, 0.12 parts by mass of catalyst dibutyltin dilaurate, and 14 parts by mass of N,N-dimethylacetamide are stirred and mixed for 2 hours to obtain mixture A; 1.5 parts by mass of isocyanate monomer are dissolved in 14 parts by mass of N,N-dimethylacetamide and added dropwise to mixture A, stirred at 82°C for 4 hours, then cooled to 70°C, and 14 parts by mass of N,N-dimethylacetamide containing 2 parts by mass of rosin-based polyol and 0.09 parts by mass of 1,4-butanediol are added dropwise, the reaction is continued for 9 hours, and then dried and cured at 82°C for 24 hours. Then, the mixture is crushed, ground, and passed through a 100-mesh sieve to obtain polyurethane hot melt adhesive powder.

[0044] The preparation steps of the rosin-based polyol are as follows: Under nitrogen protection, 300 parts by mass of rosin are heated to 200°C to melt, then 310 parts by mass of tung oil acid are added, and after reacting for 6 hours, 0.6 parts by mass of zinc oxide are added, and 298 parts by mass of triethanolamine are added dropwise. Then, the temperature is raised to 220°C within 1 hour and reacted for 9 hours to obtain the rosin-based polyol. Comparative Example 1

[0045] The only difference between Comparative Example 1 and Example 2 is that the base fabric A of Comparative Example 1 is PET nonwoven fabric, rather than nonwoven fabric treated with a hydrophilic finishing agent on one side. Comparative Example 2

[0046] The only difference between Comparative Example 2 and Example 2 is that Comparative Example 2 uses TPU hot melt adhesive powder. Comparative Examples 3-6

[0047] The only difference between Comparative Examples 3-6 and Example 2 is that the molar ratio of rosin-based polyol to isocyanate monomer in Comparative Example 3 is 0.2:1.1, 0.3:1.1, 0.5:1.1, and 0.6:1.1, respectively. Example of effect

[0048] Table 1 below shows the performance test results of the integral recyclable artificial turf prepared in Examples 1-3 and Comparative Examples 1-6: Table 1

[0049] Table 1 shows that the recyclable artificial turf in Examples 1-3 has good bonding strength and good drainage.

[0050] Among them, Comparative Example 1 and Examples 1-3 showed high tensile strength and pull-out force of the recyclable artificial turf. The only difference between Comparative Example 2 and Example 2 was that Comparative Example 2 used TPU hot melt adhesive powder, resulting in weaker tensile strength and pull-out force. The only difference between Comparative Examples 3-6 and Example 2 was that the molar ratio of rosin-based polyol to isocyanate monomer in Comparative Example 3 was 0.2:1.1, 0.3:1.1, 0.5:1.1, and 0.6:1.1, respectively. As the molar ratio of rosin-based polyol increased, the tensile strength and pull-out force of the turf first increased and then decreased, reaching a peak within the range of 1-3. This trend indicates that the appropriate introduction of a branched structure with rosin-based polyol as the branching center helps to construct a denser and more cohesive polyurethane network, thereby effectively improving the bonding strength between the layers of the turf.

[0051] As shown in Table 1, the overall recyclable artificial turf of Examples 1-3 exhibits good drainage. The only difference between Comparative Example 1 and Example 2 is that the base fabric A uses ordinary PET nonwoven fabric without hydrophilic treatment, rather than the functional nonwoven fabric of this invention that undergoes alkyl glycoside foaming and single-sided treatment with a hydrophilic finishing agent obtained from the reaction of amino-chitosan and gallic acid. Therefore, it cannot construct a "hydrophilic on top, hydrophobic on the bottom" unidirectional moisture-wicking structure, resulting in difficulty in rapid directional drainage and a significant decrease in drainage performance. The difference between Comparative Example 2 and Example 2 is only that the hot melt adhesive powder used in Comparative Example 2 is TPU hot melt adhesive powder. TPU hot melt adhesive powder easily forms a dense continuous phase during the melt composite process, blocking the pores of the base fabric and directly blocking the vertical penetration channels of water, thus its drainage performance is significantly inferior to Example 2. The only difference between Comparative Examples 3-6 and Example 2 is the rosin used in Comparative Example 3. The molar ratios of rosin-based polyols to isocyanate monomers were 0.2:1.1, 0.3:1.1, 0.5:1.1, and 0.6:1.1, respectively. As the proportion of rosin-based polyols increased, the number of hydrophobic cavities induced by rosin-tung acid in the polyurethane hot melt adhesive powder gradually increased. These micro- and nano-scale cavities constructed interconnected permeation channels within the adhesive layer, effectively reducing water transport resistance without sacrificing adhesive strength, thereby significantly improving the drainage of the lawn. Experimental results showed that the permeability continuously increased with the increase of the molar ratio of rosin-based polyols, and performed best when the ratio range used in Examples 1 to 3 was reached. When the molar ratio was further increased beyond this range, the permeability tended to stabilize or even slightly decreased, possibly because the excessive branching density led to the densification of the adhesive layer structure or uneven phase separation, which in turn partially hindered the continuity of the water channels.

[0052] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A fully recyclable artificial turf, comprising artificial grass fibers and a composite base fabric; characterized in that, The composite base fabric includes a base fabric A for fixing artificial grass fibers, a mesh fabric, a base fabric B at the bottom of the lawn, and polyurethane hot melt adhesive powder for bonding base fabric A, mesh fabric, and base fabric B together.

2. The recyclable artificial turf according to claim 1, characterized in that, The base fabric A is a nonwoven fabric that has undergone unilateral hydrophilic treatment with a hydrophilic finishing agent.

3. The recyclable artificial turf according to claim 2, characterized in that, The hydrophilic finishing agent is obtained by reacting aminated chitosan with gallic acid.

4. The recyclable artificial turf according to claim 1, characterized in that, The polyurethane hot melt adhesive powder is obtained by compounding rosin-based polyol, isocyanate monomer, 1,4-butanediol and polytetrahydrofuran.

5. A method for preparing a monolithically recyclable artificial turf as described in any one of claims 1 to 4, characterized in that, The preparation steps include: (1) Lay a mesh of the same size on the side of the base fabric A that has not been hydrophilically treated, then sprinkle polyurethane hot melt adhesive powder evenly on the mesh, and then heat it to melt the polyurethane hot melt adhesive powder to bond the base fabric A and the mesh to the mesh to obtain a pre-composite base fabric. (2) Tuft artificial grass fibers onto the pre-composite base fabric, with the mesh side facing down during the composite process; (3) The base fabric B is attached to the mesh surface of the material obtained in step (2), and the base fabric B is heated by a heating roller to bond the material obtained in step (2) together.

6. The method for preparing a fully recyclable artificial turf according to claim 5, characterized in that, The preparation steps of the base fabric A are as follows: add 0.1~1 parts by mass of alkyl glycoside to 100 parts by mass of hydrophilic finishing agent, then stir and foam at 2000~3000 r / min for 2~4 min, and then distribute the foam at 5~10 g / m 2 The amount of coating is evenly applied to one side of the nonwoven fabric, dried at 55~65℃, cured at 160~180℃ for 55~65s, and then washed and dried to obtain base fabric A.

7. The method for preparing a fully recyclable artificial turf according to claim 6, characterized in that, The preparation steps of the hydrophilic finishing agent are as follows: Aminated chitosan and gallic acid are mixed and dissolved in deionized water at a mass ratio of (3~5):1, which is 5~10 times the mass of the aminated chitosan. Then the pH of the solution is adjusted to 4.5~5.5, and the mixture is stirred at room temperature for 8~12 hours to obtain the hydrophilic finishing agent.

8. The method for preparing a fully recyclable artificial turf according to claim 5, characterized in that, The preparation steps of the polyurethane hot melt adhesive powder are as follows: 2.55 parts by weight of dried polytetrahydrofuran, 0.08-0.12 parts by weight of catalyst dibutyltin dilaurate, and 10-14 parts by weight of N,N-dimethylacetamide are stirred and mixed for 1-2 hours to obtain mixture A; 1.3-1.5 parts by weight of isocyanate monomer are dissolved in 10-14 parts by weight of N,N-dimethylacetamide and added dropwise to mixture A, stirred at 78-82℃ for 2-4 hours, then cooled to 70℃, and 10-14 parts by weight of N,N-dimethylacetamide containing 1.8-2 parts by weight of rosin-based polyol and 0.07-0.09 parts by weight of 1,4-butanediol are added dropwise, the reaction is continued for 7-9 hours, and then dried and cured at 78-82℃ for 24 hours, and then crushed and ground through a 20-100 mesh sieve to obtain polyurethane hot melt adhesive powder.

9. The method for preparing a fully recyclable artificial turf according to claim 8, characterized in that, The preparation steps of the rosin-based polyol are as follows: Under nitrogen protection, 300 parts by mass of rosin are heated to 155~200℃ to melt, then 300~310 parts by mass of tung oil acid are added, and after reacting for 4~6 hours, 0.6 parts by mass of zinc oxide are added, and 223~298 parts by mass of triethanolamine are added dropwise. Then, the temperature is raised to 180~220℃ within 1 hour and reacted for 7~9 hours to obtain the rosin-based polyol.

10. The method for preparing a fully recyclable artificial turf according to claim 5, characterized in that, The speed of the heating roller is 0.1~5m / min, and the heating temperature is 80~120℃.

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