Highly permeable lawn and preparation method thereof

Abstract

The invention discloses a highly permeable lawn and a preparation method thereof, the highly permeable lawn comprises artificial grass yarns, gum and a base layer, the artificial grass yarns are woven on the base layer, the gum is arranged on the bottom surface of the base layer, the artificial grass yarns and the base layer are fixed, the gum comprises latex, a calcium carbonate filler, a foaming agent and a cross-linking agent, the glass transition temperature Tg of the latex is 10-40 DEG C, the foaming agent is a foaming agent, and the cross-linking agent is a cross-linking agent. The latex comprises carboxylic butadiene-styrene latex and ethylene-vinyl acetate copolymer latex; the latex comprises the following components in parts by mass: 60-90 parts of carboxylic butadiene-styrene latex and 10-40 parts of ethylene-vinyl acetate copolymer latex. The base layer in the artificial turf is improved, the porous breathable gum is prepared, it is ensured that the mechanical property of the artificial turf meets the requirement, and the high water permeability of the artificial turf is achieved under the condition that drainage holes are not punched.

Description

Technical Field

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

[0002] Artificial turf is a chemical product that simulates natural turf through synthetic fibers. It has the advantages of durability, low maintenance requirements and all-weather applicability, and is mostly used in sports venues, public and educational facilities. Generally speaking, artificial turf is commonly used in open-air places and has the advantage of being easy to care for. However, artificial turf used outdoors has high requirements for water permeability to reduce the problem of water accumulation. Currently, the industry generally achieves the goal of high water permeability from the structural aspect of artificial turf, such as punching holes in the adhesive backing and the base fabric to avoid obstruction of drainage, but this will lead to a decrease in the mechanical properties of the artificial turf itself. Based on this, the present invention proposes a new type of highly permeable turf that maintains the mechanical properties of the turf while also having high water permeability. Summary of the Invention

[0003] To address the aforementioned technical issues, the present invention aims to provide a highly permeable turf and its preparation method, improve the base layer of artificial turf, and prepare a porous, breathable adhesive backing. This ensures that the mechanical properties of the artificial turf meet the required standards, achieving high permeability without requiring drainage holes.

[0004] In order to achieve the above-mentioned object of the invention, the technical solution adopted by the present invention is as follows:

[0005] In a first aspect of the present invention, a highly permeable lawn is provided, comprising artificial grass yarn, adhesive backing and a base layer, wherein the artificial grass yarn is woven on the base layer, and the adhesive backing is provided on the bottom surface of the base layer to fix the artificial grass yarn to the base layer.

[0006] The backing adhesive comprises latex, calcium carbonate filler, foaming agent and cross-linking agent, wherein the glass transition temperature Tg of the latex is 10-40° C., and the latex comprises carboxylated styrene-butadiene latex and ethylene-vinyl acetate copolymer latex;

[0007] In the latex, calculated by weight, the carboxylated styrene-butadiene latex is 60 to 90 parts, and the ethylene-vinyl acetate copolymer latex is 10 to 40 parts.

[0008] Preferably, the crosslinking agent includes one or more of polyisocyanate, metal ion crosslinking agent, carbodiimide and aziridine, and the mass of the crosslinking agent accounts for 0.1-5% of the mass of the latex.

[0009] Preferably, the mass ratio of calcium carbonate filler to latex is 1:(1-9).

[0010] Preferably, the foaming agent includes sodium dodecyl sulfate SDS and / or sodium α-olefin sulfonate AOS, and the mass of the foaming agent accounts for 0.1 to 0.15% of the mass of the latex.

[0011] Preferably, the base layer comprises a polypropylene base fabric having a gram weight of 90 to 200 g / m 2 , among which, in 1m 2 In the polypropylene base fabric, the warp area ratio is 1.1 to 1.2, and the weft area ratio is 0.89 to 0.91.

[0012] More preferably, the base layer further comprises a mesh cloth or a long-fiber non-woven fabric, and the polypropylene base cloth is arranged above or below the mesh cloth or the long-fiber non-woven fabric, wherein the gram weight of the polypropylene base cloth is 90 to 200 g / m 2 The mesh weight is 40~100g / m 2 The gram weight of long fiber non-woven fabric is 40~60g / m 2 .

[0013] More preferably, the mesh comprises polypropylene mesh or polyethylene terephthalate mesh.

[0014] More preferably, the long-fiber nonwoven fabric comprises polyethylene terephthalate long-fiber nonwoven fabric.

[0015] In a second aspect of the present invention, the present invention provides a method for preparing a highly permeable lawn, as follows:

[0016] S1, weaving artificial grass yarn on the base layer;

[0017] S2, stirring and mixing latex, calcium carbonate filler, foaming agent and cross-linking agent at a stirring speed of 150-300 rpm for 10-30 min, with a foaming multiple of 0.8-1.5 times to obtain a backing adhesive;

[0018] S3. Apply the adhesive backing to the base layer and bond the artificial turf to the base layer.

[0019] Preferably, in step S3, the coating amount of the adhesive on the base layer is 0.2-1.0 kg / m 2 .

[0020] Beneficial effects:

[0021] The present invention improves the base layer in the artificial turf and prepares a porous and breathable backing adhesive, thereby ensuring that the mechanical properties of the artificial turf meet the requirements and achieving high water permeability of the artificial turf without drilling drainage holes. DETAILED DESCRIPTION

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below. Obviously, the following descriptions are only some embodiments of the present invention. For those skilled in the art, other implementation methods can be obtained based on these embodiments without inventive work.

[0023] The present invention proposes a highly permeable lawn, comprising artificial turf, adhesive backing, and a base layer. The artificial turf is woven into the base layer, and the adhesive backing is applied to the bottom surface of the base layer to secure the artificial turf to the base layer. The present invention improves both the adhesive backing and the base layer. The technical solutions of the present invention are described in detail below.

[0024] The base layer of the present invention has at least the following two forms:

[0025] The base layer includes a polypropylene base fabric with a gram weight of 90 to 200 g / m 2 Among them, in 1m 2 In the polypropylene base fabric, the warp area ratio is 1 to 1.01, and the weft area ratio is 0.53 to 0.55. The invention ensures the base fabric's clamping force on artificial turf and excellent water permeability by designing the area stacking ratio of the warp and weft yarns.

[0026] The base layer also includes mesh or long fiber non-woven fabric, that is, the base layer is a double-layer structure, the double-layer structure is polypropylene base fabric and mesh, or the double-layer structure is polypropylene base fabric and long fiber non-woven fabric, the mesh or long fiber non-woven fabric has the function of enhancing the overall mechanical properties of the base layer. The gram weight of the polypropylene base fabric is 90-200g / m 2 The mesh weight is 40~100g / m 2 The gram weight of long fiber non-woven fabric is 40~60g / m 2 .

[0027] Mesh cloth / long fiber non-woven fabric has good water permeability and structural strength. The mesh cloth / long fiber non-woven fabric is matched with the base fabric to balance the water permeability and clamping force of the base fabric. Because the density of warp and weft yarns is low, they are easy to shift during the tufting process, resulting in gaps, which provides better space conditions for lawn water permeability. The mesh cloth / long fiber non-woven fabric maintains the overall structural strength of the base layer to avoid the shedding of artificial grass fibers.

[0028] Preferably, the mesh cloth comprises polypropylene mesh cloth or polyethylene terephthalate mesh cloth.

[0029] Preferably, the long-fiber nonwoven fabric comprises polyethylene terephthalate long-fiber nonwoven fabric.

[0030] The present invention improves the base structure and enhances the overall water permeability of the base while maintaining the mechanical properties of the base. The adhesive of the present invention is used to achieve high water permeability.

[0031] The backing adhesive comprises latex, calcium carbonate filler, a foaming agent, and a crosslinking agent. The latex has a glass transition temperature (Tg) of 10-40°C to maintain stiffness. The latex comprises carboxylated styrene-butadiene latex and ethylene-vinyl acetate copolymer latex. This blend of carboxylated styrene-butadiene latex and ethylene-vinyl acetate copolymer latex provides excellent water permeability while maintaining the mechanical properties of the artificial turf product, eliminating the need for perforation.

[0032] Preferably, in the latex, calculated by weight, the carboxylated styrene butadiene latex is 60 to 90 parts, and the ethylene-vinyl acetate copolymer latex is 10 to 40 parts. It is easy to understand that the glass transition temperature of the latex actually refers to the overall glass transition temperature of the carboxylated styrene butadiene latex and the ethylene-vinyl acetate copolymer latex after blending. The glass transition temperature of the latex is adjusted by regulating the ratio of the two. Preferably, the total weight of the carboxylated styrene butadiene latex and the ethylene-vinyl acetate copolymer latex is 100 parts.

[0033] The amount of carboxylated styrene-butadiene latex and ethylene-vinyl acetate copolymer latex significantly impacts adhesive properties. Excessive carboxylated styrene-butadiene latex can weaken the adhesive's bond strength and increase its brittleness, while insufficient ethylene-vinyl acetate copolymer latex can compromise its adhesion and increase its brittleness. Excessive ethylene-vinyl acetate copolymer can form a film, resulting in a soft adhesive overall, insufficient mechanical properties, and reduced water permeability.

[0034] The function of a crosslinking agent is to crosslink the two components of the latex to form a whole, thereby improving the performance of the adhesive. The weight of the crosslinking agent accounts for 0.1-5% of the mass of the latex. Without the addition of a crosslinking agent, the adhesive will suffer from weakening adhesion when exposed to water. Preferably, the crosslinking agent includes one or more of polyisocyanates, metal ion crosslinkers, carbodiimides, and aziridines.

[0035] The function of the calcium carbonate filler is to promote high foaming during the preparation of the back glue and ensure that the back glue has appropriate bottom stiffness. Preferably, the mass ratio of the calcium carbonate filler to the latex is 1:(1-9).

[0036] The foaming agent accounts for 0.1-0.15% of the latex mass. The foaming agent is used to achieve stable high-rate foaming during the preparation of the adhesive, thereby imparting a high porosity to the adhesive. Preferably, the foaming agent comprises sodium dodecyl sulfate (SDS) and / or sodium α-olefin sulfonate (AOS).

[0037] Based on the above-mentioned adhesive composition, the present invention proposes the specific preparation steps of the adhesive as follows:

[0038] The latex, calcium carbonate filler, foaming agent and cross-linking agent are stirred and mixed at a stirring speed of 150-300 rpm for 10-30 minutes and a foaming multiple of 0.8-1.5 times to obtain a backing adhesive with a porosity of 35-65%.

[0039] The porosity of the adhesive is determined by testing the dry adhesive. The pore volume is calculated by measuring the change in mass before and after immersion in water. This method uses water as the medium. When the material is fully submerged, the volume of water displaced equals the total volume of the material. By comparing the mass differences between the dry state, the saturated state, and the suspended state in water, the pore volume percentage within the material can be accurately calculated.

[0040] In order to achieve stable high-ratio foaming, it is preferred to use screw feeding and an inflatable enhanced foaming mixing head for stirring. In the screw feeding equipment, the screw length-to-diameter ratio L / D is (18-24):1, the screw groove adopts a gradient structure, and the compression ratio is (2-3):1 to reduce the shearing of the material and avoid premature foaming. Air is injected during the foaming process, and the air flow rate is 300-500L / min.

[0041] The preparation method of the highly permeable artificial turf of the present invention is as follows:

[0042] S1, weaving artificial grass yarn on the base layer;

[0043] S2, preparing adhesive;

[0044] S3. Apply the adhesive backing to the base layer and bond the artificial turf to the base layer.

[0045] Preferably, in step S3, in order to ensure the balance between water permeability and binding force, the coating amount of the adhesive on the base layer is 0.2-1.0 kg / m 2 , i.e. 1m 2 The amount of adhesive applied to the base layer is 0.2 to 1.0 kg.

[0046] This invention improves the base layer and adhesive backing in artificial turf. The artificial turf yarns are conventional grass yarns, resulting in highly permeable artificial turf. Specifically, while maintaining the same base weight as conventional base material, the overall permeability of the base layer is enhanced by adjusting the stacking area ratio of the warp and weft yarns. The adhesive backing is produced through a foaming process, ensuring adhesion while enhancing permeability. Combined with the base layer, it produces a highly permeable artificial turf.

[0047] The technical solution of the present invention is described in detail below with reference to specific embodiments.

[0048] Example 1

[0049] The backing adhesive includes latex, calcium carbonate filler, foaming agent and cross-linking agent.

[0050] The glass transition temperature Tg of the latex is 10° C., and in the latex, calculated by weight, the carboxylated styrene-butadiene latex is 80 parts and the ethylene-vinyl acetate copolymer latex is 20 parts.

[0051] The mass of the cross-linking agent accounts for 3% of the mass of the latex. The cross-linking agent is a compound of zinc oxide and aziridine, wherein, calculated by mass, the zinc oxide is 1.8 parts and the aziridine is 1.2 parts.

[0052] The mass ratio of calcium carbonate filler to latex is 1:1.

[0053] The foaming agent is sodium dodecyl sulfate SDS, and its mass accounts for 0.1% of the mass of the latex.

[0054] The base layer is polypropylene fabric, the weight of which is 120g / m 2 Among them, in 1m 2 In the polypropylene base fabric, the warp area ratio is 1.01 and the weft area ratio is 0.53.

[0055] The preparation of artificial turf is as follows:

[0056] S1, weaving artificial grass yarn on the base layer;

[0057] S2. Preparation of backing adhesive: latex, calcium carbonate filler, foaming agent and cross-linking agent were stirred and mixed at a stirring speed of 200 rpm for 20 minutes and a foaming multiple of 1 to prepare backing adhesive.

[0058] S3, apply the adhesive on the base layer, the amount of adhesive applied on the base layer is 0.6kg / m 2 , bond and fix the artificial turf to the base layer.

[0059] Example 2

[0060] The backing adhesive includes latex, calcium carbonate filler, foaming agent and cross-linking agent.

[0061] The glass transition temperature Tg of the latex is 10° C., and in the latex, calculated by weight, the carboxylated styrene-butadiene latex is 80 parts and the ethylene-vinyl acetate copolymer latex is 20 parts.

[0062] The mass of the cross-linking agent accounts for 3% of the mass of the latex. The cross-linking agent is a compound of zinc oxide and aziridine, wherein, calculated by mass, the zinc oxide is 1.8 parts and the aziridine is 1.2 parts.

[0063] The mass ratio of calcium carbonate filler to latex is 1:1.

[0064] The foaming agent is sodium dodecyl sulfate SDS, and its mass accounts for 0.1% of the mass of the latex.

[0065] The base layer is a double-layer structure, one base fabric is a polypropylene base fabric, and the weight of the polypropylene base fabric is 120g / m 2 Among them, in 1m 2 In the polypropylene base fabric, the warp area ratio is 1.01 and the weft area ratio is 0.53. The secondary base fabric is a mesh fabric made of polypropylene with a gram weight of 60g / m 2 .

[0066] The preparation of artificial turf is as follows:

[0067] S1, weaving artificial grass yarn on the base layer;

[0068] S2. Preparation of backing adhesive: latex, calcium carbonate filler, foaming agent and cross-linking agent were stirred and mixed at a stirring speed of 200 rpm for 20 minutes and a foaming multiple of 1 to prepare backing adhesive.

[0069] S3, apply the adhesive on the base layer, the amount of adhesive applied on the base layer is 0.6kg / m 2 , bond and fix the artificial turf to the base layer.

[0070] Example 3

[0071] The backing adhesive includes latex, calcium carbonate filler, foaming agent and cross-linking agent.

[0072] The glass transition temperature Tg of the latex is 10° C., and in the latex, calculated by weight, the carboxylated styrene-butadiene latex is 80 parts and the ethylene-vinyl acetate copolymer latex is 20 parts.

[0073] The mass of the cross-linking agent accounts for 3% of the mass of the latex. The cross-linking agent is a compound of zinc oxide and aziridine, wherein, calculated by mass, the zinc oxide is 1.8 parts and the aziridine is 1.2 parts.

[0074] The mass ratio of calcium carbonate filler to latex is 1:1.

[0075] The foaming agent is sodium dodecyl sulfate SDS, and its mass accounts for 0.1% of the mass of the latex.

[0076] The base layer is a double-layer structure, one base fabric is a polypropylene base fabric, and the weight of the polypropylene base fabric is 120g / m 2 Among them, in 1m 2 In the polypropylene base fabric, the warp area ratio is 1.01 and the weft area ratio is 0.53. The secondary base fabric is a long-fiber non-woven fabric made of polyethylene terephthalate long-fiber non-woven fabric with a gram weight of 50g / m 2 .

[0077] The preparation of artificial turf is as follows:

[0078] S1, weaving artificial grass yarn on the base layer;

[0079] S2. Preparation of backing adhesive: latex, calcium carbonate filler, foaming agent and cross-linking agent were stirred and mixed at a stirring speed of 200 rpm for 20 minutes and a foaming multiple of 1 to prepare backing adhesive.

[0080] S3, apply the adhesive backing on the base layer. The amount of adhesive backing on the base layer is 0.8kg / m 2 , bond and fix the artificial turf to the base layer.

[0081] Comparative Example 1

[0082] The backing adhesive includes latex, calcium carbonate filler, foaming agent and cross-linking agent.

[0083] The glass transition temperature Tg of the latex is 10° C., and in the latex, calculated by weight, the carboxylated styrene-butadiene latex is 100 parts, and the ethylene-vinyl acetate copolymer latex is 0 parts.

[0084] The mass of the cross-linking agent accounts for 3% of the mass of the latex. The cross-linking agent is a compound of zinc oxide and aziridine, wherein, calculated by mass, the zinc oxide is 1.8 parts and the aziridine is 1.2 parts.

[0085] The mass ratio of calcium carbonate filler to latex is 1:1.

[0086] The foaming agent is sodium dodecyl sulfate SDS, and its mass accounts for 0.1% of the mass of the latex.

[0087] The base layer is a double-layer structure, one base fabric is a polypropylene base fabric, and the weight of the polypropylene base fabric is 120g / m 2 Among them, in 1m 2 In the polypropylene base fabric, the warp area ratio is 1.01 and the weft area ratio is 0.53. The secondary base fabric is a long-fiber non-woven fabric made of polyethylene terephthalate long-fiber non-woven fabric with a gram weight of 50g / m 2 .

[0088] The preparation of artificial turf is as follows:

[0089] S1, weaving artificial grass yarn on the base layer;

[0090] S2. Preparation of backing adhesive: latex, calcium carbonate filler, foaming agent and cross-linking agent were stirred and mixed at a stirring speed of 200 rpm for 20 minutes and a foaming multiple of 1 to prepare backing adhesive.

[0091] S3, apply the adhesive backing on the base layer. The amount of adhesive backing on the base layer is 0.8kg / m 2 , bond and fix the artificial turf to the base layer.

[0092] Comparative Example 2

[0093] The backing adhesive includes latex, calcium carbonate filler, foaming agent and cross-linking agent.

[0094] The glass transition temperature Tg of the latex is 10° C., and in the latex, calculated by weight, the carboxylated styrene-butadiene latex is 20 parts and the ethylene-vinyl acetate copolymer latex is 80 parts.

[0095] The mass of the cross-linking agent accounts for 3% of the mass of the latex. The cross-linking agent is a compound of zinc oxide and aziridine, wherein, calculated by mass, the zinc oxide is 1.8 parts and the aziridine is 1.2 parts.

[0096] The mass ratio of calcium carbonate filler to latex is 1:1.

[0097] The foaming agent is sodium dodecyl sulfate SDS, and its mass accounts for 0.1% of the mass of the latex.

[0098] The base layer is a double-layer structure, one base fabric is a polypropylene base fabric, and the weight of the polypropylene base fabric is 120g / m 2 Among them, in 1m 2 In the polypropylene base fabric, the warp area ratio is 1.01 and the weft area ratio is 0.53. The secondary base fabric is a long-fiber non-woven fabric made of polyethylene terephthalate long-fiber non-woven fabric with a gram weight of 50g / m 2 .

[0099] The preparation of artificial turf is as follows:

[0100] S1, weaving artificial grass yarn on the base layer;

[0101] S2. Preparation of backing adhesive: latex, calcium carbonate filler, foaming agent and cross-linking agent were stirred and mixed at a stirring speed of 200 rpm for 20 minutes and a foaming multiple of 1 to prepare backing adhesive.

[0102] S3, apply the adhesive backing on the base layer. The amount of adhesive backing on the base layer is 0.8kg / m 2 , bond and fix the artificial turf to the base layer.

[0103] Comparative Example 3

[0104] The backing adhesive includes latex, calcium carbonate filler, foaming agent and cross-linking agent.

[0105] The glass transition temperature Tg of the latex is 60° C. In the latex, calculated by weight, the carboxylated styrene-butadiene latex is 80 parts and the ethylene-vinyl acetate copolymer latex is 20 parts.

[0106] The mass of the cross-linking agent accounts for 0% of the mass of the latex. The cross-linking agent is a compound of zinc oxide and aziridine, wherein, calculated by mass, the zinc oxide is 1.8 parts and the aziridine is 1.2 parts.

[0107] The mass ratio of calcium carbonate filler to latex is 1:1.

[0108] The foaming agent is sodium dodecyl sulfate SDS, and its mass accounts for 0.1% of the mass of the latex.

[0109] The base layer is a double-layer structure, one base fabric is a polypropylene base fabric, and the weight of the polypropylene base fabric is 120g / m 2 Among them, in 1m 2 In the polypropylene base fabric, the warp area ratio is 1.01 and the weft area ratio is 0.53. The secondary base fabric is a long-fiber non-woven fabric made of polyethylene terephthalate long-fiber non-woven fabric with a gram weight of 50g / m 2 .

[0110] The preparation of artificial turf is as follows:

[0111] S1, weaving artificial grass yarn on the base layer;

[0112] S2. Preparation of backing adhesive: latex, calcium carbonate filler, foaming agent and cross-linking agent were stirred and mixed at a stirring speed of 200 rpm for 20 minutes and a foaming multiple of 1 to prepare backing adhesive.

[0113] S3, apply the adhesive backing on the base layer. The amount of adhesive backing on the base layer is 0.8kg / m 2 , bond and fix the artificial turf to the base layer.

[0114] Comparative Example 4

[0115] The backing adhesive includes latex, calcium carbonate filler, foaming agent and cross-linking agent.

[0116] The glass transition temperature Tg of the latex is 60° C. In the latex, calculated by weight, the carboxylated styrene-butadiene latex is 80 parts and the ethylene-vinyl acetate copolymer latex is 20 parts.

[0117] The mass of the cross-linking agent accounts for 3% of the mass of the latex. The cross-linking agent is a compound of zinc oxide and aziridine, wherein the zinc oxide is 1.8 parts and the aziridine is 1.2 parts.

[0118] The mass ratio of calcium carbonate filler to latex is 1.

[0119] The foaming agent is sodium dodecyl sulfate SDS, and its mass accounts for 0.1% of the mass of the latex.

[0120] The base layer is a double-layer structure, one base fabric is a conventional polypropylene base fabric, the weight of the polypropylene base fabric is 120g / m 2 Among them, in 1m 2 In the polypropylene base fabric, the warp area ratio is 1.2 and the weft area ratio is 0.91. The secondary base fabric is a long-fiber non-woven fabric made of polyethylene terephthalate long-fiber non-woven fabric with a gram weight of 50g / m 2 .

[0121] The preparation of artificial turf is as follows:

[0122] S1, weaving artificial grass yarn on the base layer;

[0123] S2. Preparation of backing adhesive: latex, calcium carbonate filler, foaming agent and cross-linking agent were stirred and mixed at a stirring speed of 200 rpm for 20 minutes and a foaming multiple of 1 to prepare backing adhesive.

[0124] S3, apply the adhesive backing on the base layer. The amount of adhesive backing on the base layer is 0.8kg / m 2 , bond and fix the artificial turf to the base layer.

[0125] The mechanical properties and water permeability of the artificial turfs prepared in Example 3 and Comparative Examples 1-4 were tested, and the data are shown in Table 1.

[0126] Table 1 Mechanical properties and water permeability data of artificial turf batches of the embodiment and comparative example

[0127]

[0128]

[0129] The embodiments provided by the present invention are described in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified in a number of ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A highly permeable lawn, characterized in that: It includes artificial grass yarn, adhesive backing and base layer. The artificial grass yarn is woven on the base layer, and the adhesive backing is set on the bottom surface of the base layer to fix the artificial grass yarn to the base layer. The backing adhesive comprises latex, calcium carbonate filler, foaming agent and cross-linking agent, wherein the glass transition temperature of the latex is 10-40° C., and the latex comprises carboxylated styrene-butadiene latex and ethylene-vinyl acetate copolymer latex; In the latex, calculated by weight, the carboxylated styrene-butadiene latex is 60 to 90 parts, and the ethylene-vinyl acetate copolymer latex is 10 to 40 parts.

2. The highly permeable lawn according to claim 1, characterized in that: The crosslinking agent comprises one or more of polyisocyanate, metal ion crosslinking agent, carbodiimide and aziridine, and the mass of the crosslinking agent accounts for 0.1-5% of the mass of the latex.

3. The highly permeable lawn according to claim 1, characterized in that: The mass ratio of calcium carbonate filler to latex is 1:(1-9).

4. The highly permeable lawn according to claim 1, characterized in that: The foaming agent comprises sodium lauryl sulfate and / or sodium α-olefin sulfonate, and the mass of the foaming agent accounts for 0.1-0.15% of the mass of the latex.

5. The highly permeable lawn according to any one of claims 1 to 4, characterized in that: The base layer includes a polypropylene base fabric with a gram weight of 90 to 200 g / m 2 , among which, in 1m 2 In the polypropylene base fabric, the warp area ratio is 1 to 1.01, and the weft area ratio is 0.53 to 0.

55.

6. The highly permeable lawn according to claim 5, characterized in that: The base layer also includes a mesh cloth or a long-fiber non-woven fabric, and the polypropylene base cloth is arranged above or below the mesh cloth or the long-fiber non-woven fabric, wherein the gram weight of the polypropylene base cloth is 90 to 200 g / m 2 The mesh weight is 40~100g / m 2 The gram weight of long fiber non-woven fabric is 40~60g / m 2 .

7. The highly permeable lawn according to claim 6, characterized in that: The mesh includes polypropylene mesh or polyethylene terephthalate mesh.

8. The highly permeable lawn according to claim 6, characterized in that: The long-fiber nonwoven fabric includes a polyethylene terephthalate long-fiber nonwoven fabric.

9. A method for preparing a highly permeable lawn, characterized in that: The steps of preparing the highly permeable lawn according to any one of claims 1 to 8 are as follows: S1, weaving artificial grass yarn on the base layer; S2, stirring and mixing latex, calcium carbonate filler, foaming agent and cross-linking agent at a stirring speed of 150-300 rpm for 10-30 min, with a foaming multiple of 0.8-1.5 times to obtain a backing adhesive; S3. Apply the adhesive backing to the base layer and bond the artificial turf to the base layer.

10. The preparation method according to claim 9, characterized in that In step S3, the coating amount of the adhesive on the base layer is 0.2-1.0 kg / m 2 .

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