Flame-retardant artificial grass yarn, preparation method thereof and artificial turf

Abstract

The invention relates to a flame-retardant artificial grass yarn, a preparation method thereof and an artificial turf, and belongs to the technical field of artificial turfs, the artificial grass yarn comprises polyethylene resin and a flame retardant, and the flame retardant is prepared from phytic acid, melamine and alpha-ZrP. The flame retardant prepared from the phytic acid, the melamine and the alpha-ZrP is added into the polyethylene resin, so that the flame retardant property of the polyethylene resin can be greatly improved, and the flame-retardant artificial turf is prepared. Wherein in the flame retardant, the phytic acid provides a flame-retardant element phosphorus, the melamine provides a flame-retardant element nitrogen, and the alpha-ZrP has a physical barrier effect and can be mutually matched with the phytic acid and the melamine, so that the flame retardant with a relatively good flame-retardant effect is obtained.

Description

Technical Field

[0001] This invention belongs to the field of artificial turf technology, specifically relating to a flame-retardant artificial turf fiber and its preparation method, and artificial turf. Background Technology

[0002] Artificial turf is a composite material made from synthetic resins such as polyethylene and polypropylene. It is produced by drawing, weaving, and tufting to create grass-like fibers, which are then fixed onto a base fabric layer (such as polypropylene woven fabric or polyethylene mesh fabric). The back is coated with adhesive (such as styrene-butadiene latex or polyurethane) to enhance stability. It is widely used in sports venues, urban greening, and interior decoration. Compared to natural turf, artificial turf has lower maintenance costs and is more resistant to high and low temperatures, and can maintain a consistent appearance over a long period of time.

[0003] Since artificial turf is made of flammable synthetic resins (such as polyethylene and polypropylene), it is easily ignited by open flames. In densely populated places such as stadiums, kindergartens, and commercial complexes, the flame retardant performance of artificial turf is a core indicator to ensure the safety of life and property. Therefore, in the existing technology, flame retardants (such as 10%-20% of halogenated flame retardants or inorganic flame retardants) are usually added to the synthetic resin to improve the flame retardant performance of artificial turf. However, there are problems such as poor compatibility between flame retardants and synthetic resins, affecting the mechanical properties of grass fibers, and poor environmental performance of flame retardants. Summary of the Invention

[0004] In view of the above situation and to overcome at least some of the defects of the prior art, the present invention provides flame-retardant artificial grass fibers, a method for preparing the same, and an artificial turf.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: The first aspect of the present invention provides a flame-retardant artificial grass fiber, the artificial grass fiber comprising polyethylene resin and a flame retardant, the flame retardant being prepared from phytic acid, melamine and α-ZrP.

[0006] In some embodiments, the flame retardant content in the flame-retardant artificial turf is 5-20 parts relative to 100 parts by weight of the polyethylene resin.

[0007] In some embodiments, the flame retardant content in the flame-retardant artificial turf is 13-16 parts per 100 parts by weight of the polyethylene resin.

[0008] In some embodiments, the flame-retardant artificial turf yarn further includes color masterbatch and anti-aging masterbatch. The content of color masterbatch is 3-5 parts per 100 parts by weight of the polyethylene resin, and the content of anti-aging masterbatch is 4-8 parts per 100 parts by weight. The color masterbatch includes inorganic pigments, and the anti-aging masterbatch includes light stabilizers, ultraviolet absorbers, and antioxidants.

[0009] A second aspect of the present invention provides a method for preparing flame-retardant artificial grass fibers, comprising: Polyethylene resin, flame retardant, color masterbatch and anti-aging masterbatch are thoroughly mixed, melt-extruded through a single screw extruder, cooled, and then stretched and shaped through a flat yarn testing machine to obtain artificial grass fibers.

[0010] In some embodiments, the method for preparing the flame retardant includes: α-ZrP was dispersed in water to prepare an α-ZrP dispersion. Melamine was added to water and heated to fully dissolve it. Phytic acid was added and the mixture was heated to 80-100°C for 3-6 hours. After cooling, the α-ZrP dispersion was added and subjected to ultrasonic treatment. After the treatment, the mixture was centrifuged, washed, and vacuum dried to obtain the flame retardant.

[0011] In some embodiments, in the preparation method of the flame retardant, the mass ratio of phytic acid, melamine and α-ZrP is 10:(3-6):(6-8).

[0012] In some embodiments, the ultrasonic treatment time is 20-40 minutes, and the power density per unit volume is 4-5 W / cm³. 3 .

[0013] In some embodiments, the method for preparing α-ZrP includes: Take ZrOCl2·8H2O and H3PO4 and mix them thoroughly. Heat the mixture to 200-220℃ and react for 15-20 hours. After the reaction is complete, collect the product by centrifugation, dry it under vacuum, and grind it into powder to obtain α-ZrP. The mass ratio of ZrOCl2·8H2O to H3PO4 is 1:5-10.

[0014] A third aspect of this invention provides an artificial turf, comprising: flame-retardant artificial grass fibers, a base fabric, and a backing adhesive; the method for preparing the artificial turf includes the following steps: Artificial grass fibers are woven into the front side of the base fabric in a specific ratio, and adhesive is applied to the back side of the base fabric. After drying, flame-retardant artificial turf is obtained.

[0015] The beneficial effects achieved by this invention are as follows: This invention utilizes a flame retardant prepared from phytic acid, melamine, and α-ZrP, which is added to polyethylene resin to significantly improve the flame retardant properties of the polyethylene resin, thereby producing flame-retardant artificial turf. In this flame retardant, phytic acid provides the flame-retardant element phosphorus, melamine provides the flame-retardant element nitrogen, and the physical barrier effect of α-ZrP can synergize with phytic acid and melamine to obtain a flame retardant with good flame-retardant properties. Detailed Implementation

[0016] The technical solutions in the embodiments of the present invention will be clearly and completely described below. 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 skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those familiar to those skilled in the art. Furthermore, any methods and materials similar to or equivalent to those described herein may be applied to this invention. The preferred embodiments and materials described herein are for illustrative purposes only and do not limit the scope of this application.

[0018] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0019] To address the shortcomings of the prior art mentioned in the background section, the first aspect of this invention provides a flame-retardant artificial turf yarn. The flame-retardant artificial turf yarn comprises polyethylene resin and a flame retardant, wherein the flame retardant is prepared from phytic acid, melamine, and α-ZrP. Polyethylene resin is a thermoplastic resin obtained by polymerizing ethylene monomers. Artificial turf yarn prepared using polyethylene resin has good softness, enabling it to feel close to natural grass, providing cushioning during exercise and reducing the risk of skin abrasions for athletes.

[0020] Adding flame retardants to polyethylene resin can significantly improve its flame retardant properties, thereby enhancing the flame retardant performance of artificial turf. Among flame retardants, phytic acid, as a bio-based material, is characterized by its high content of the flame-retardant element phosphorus. Phytic acid possesses six negatively charged phosphate groups linked to twelve hydroxyl groups that can hydrolyze into hydrogen ions, exhibiting excellent flame retardant capabilities. Furthermore, phytic acid, as a recyclable natural resource, can alleviate the pressure of increasingly scarce and non-renewable phosphate rock resources. Melamine can form a dense, expanded char layer at high temperatures. These char layers can isolate oxygen and heat from the matrix material, while inhibiting the escape of flammable gases, thus slowing down the combustion process. α-ZrP, as a two-dimensional layered nanomaterial, effectively blocks oxygen penetration into the material and the diffusion of flammable gases into the combustion zone. Simultaneously, the phosphorus-containing components of α-ZrP generate phosphoric acid and polyphosphoric acid during combustion, which can catalyze polymer dehydration to char, reducing the formation of flammable volatiles.

[0021] In some embodiments, the flame retardant content in the flame-retardant artificial turf yarn is 5-20 parts relative to 100 parts by weight of polyethylene resin. If the flame retardant content is too low, the char layer formed during the combustion of polyethylene resin will be discontinuous and unable to effectively isolate oxygen and heat; if the flame retardant content is too high, the processing fluidity of polyethylene resin will be too poor, resulting in poor mechanical properties of polyethylene resin. Therefore, the flame retardant content needs to be set to 5-20 parts.

[0022] In some embodiments, the flame retardant content in the flame-retardant artificial turf fibers is 13-16 parts relative to 100 parts by weight of polyethylene resin. Experiments show that when the flame retardant content is 13-16 parts, the polyethylene resin exhibits good flame retardant and mechanical properties.

[0023] In some embodiments, flame-retardant artificial turf yarn further includes color masterbatch and anti-aging masterbatch. The color masterbatch content is 3-5 parts per 100 parts by weight of polyethylene resin, and the anti-aging masterbatch content is 4-8 parts per 100 parts by weight. The color masterbatch includes inorganic pigments, and the anti-aging masterbatch includes light stabilizers, UV absorbers, and antioxidants. The color masterbatch, by adding inorganic pigments (such as titanium dioxide, iron oxide, cobalt blue, etc.), provides a rich selection of colors for the artificial turf yarn. Compared to organic pigments, inorganic pigments have stronger weather resistance and can resist the erosion of ultraviolet rays, rain, and high temperatures. The anti-aging masterbatch, through the synergistic effect of light stabilizers (such as hindered amines), UV absorbers (such as benzophenones), and antioxidants (such as hindered phenols), inhibits the molecular chain breakage of the artificial turf yarn under the influence of heat, oxygen, and ultraviolet rays, thus extending the service life of the artificial turf yarn. Excessive masterbatch content can disrupt the continuity of polyethylene molecular chains and reduce the mechanical properties of artificial grass fibers. Insufficient masterbatch content can lead to uneven dispersion of inorganic pigments in polyethylene resin, resulting in localized color differences in artificial grass fibers. Excessive anti-aging masterbatch content can reduce the flexibility and tensile strength of polyethylene resin, causing surface adhesion of artificial grass fibers. Insufficient anti-aging masterbatch content can result in insufficient anti-aging ability of polyethylene resin, making artificial grass fibers prone to yellowing, embrittlement, and cracking.

[0024] A second aspect of this invention provides a method for preparing flame-retardant artificial grass fibers, comprising: thoroughly mixing polyethylene resin, flame retardant, color masterbatch, and anti-aging masterbatch; melt-extruding the mixture using a single-screw extruder; cooling the mixture; and then stretching and shaping it using a flat filament testing machine to obtain artificial grass fibers. Melt-extrusion using a single-screw extruder allows the polyethylene resin, flame retardant, color masterbatch, and anti-aging masterbatch to be fully melted, improving the stability of the artificial grass fibers. The stretching process using the flat filament testing machine further enhances the mechanical properties of the grass fibers, while the shaping process eliminates residual stress and stabilizes the cross-sectional shape of the grass fibers.

[0025] In some embodiments, the method for preparing the flame retardant includes: dispersing α-ZrP in water to obtain an α-ZrP dispersion; adding melamine to water, heating to fully dissolve the melamine, adding phytic acid, heating to 80-100°C, reacting for 3-6 hours, cooling, adding the α-ZrP dispersion, performing ultrasonic treatment, centrifuging and washing, and vacuum drying to obtain the flame retardant. Melamine is fully dissolved by heating, and then the amino groups of melamine and the phosphate groups of phytic acid undergo an acid-base neutralization reaction at 80-100℃ to form a phytic acid-melamine flame-retardant precursor with high phosphorus and nitrogen content. This precursor has both gas-phase (releasing inert gases) and condensed-phase (catalytic char formation) flame-retardant functions. Furthermore, the phytic acid-melamine flame-retardant precursor has a good binding effect with α-ZrP, allowing it to insert into the interlayer of α-ZrP to form an "organic-inorganic" hybrid structure. This improves the compatibility of α-ZrP with polyethylene resin and promotes the dispersion of α-ZrP in polyethylene resin. Simultaneously, the physical barrier effect of α-ZrP and the chemical flame-retardant effect of phytic acid-melamine can fully complement each other, thus preparing a flame retardant with excellent flame-retardant properties.

[0026] In some embodiments, in the preparation method of the flame retardant, the mass ratio of phytic acid, melamine, and α-ZrP is 10:(3-6):(6-8). By controlling the amount of phytic acid added to be excessive, the phytic acid and melamine can react fully, while sufficient phytic acid can be provided to combine with α-ZrP.

[0027] In some embodiments, the ultrasonic treatment time is 20-40 minutes, and the power density per unit volume is 4-5 W / cm³. 3 Ultrasonic treatment can help the phytic acid-melamine flame-retardant precursor insert into the interlayer of α-ZrP, promoting the full bonding between the phytic acid-melamine flame-retardant precursor and α-ZrP. This is achieved by setting the acoustic treatment time to 20-40 minutes and the power density per unit volume to 4-5 W / cm³. 3 This allows the phytic acid-melamine flame retardant precursor to fully combine with α-ZrP, thereby improving the flame retardant effect of the flame retardant.

[0028] In some embodiments, the preparation method of α-ZrP includes: thoroughly mixing ZrOCl2·8H2O and H3PO4, heating to 200-220℃ and reacting for 15-20 h; after the reaction is complete, collecting the product by centrifugation, vacuum drying, and grinding into powder to obtain α-ZrP; wherein the mass ratio of ZrOCl2·8H2O to H3PO4 is 1:5-10. Using ZrOCl2·8H2O and H3PO4 as raw materials, a well-defined layered structure of α-ZrP can be prepared by a hydrothermal method. By setting the mass ratio of ZrOCl2·8H2O to H3PO4 to 1:5-10, the directional growth of the layered structure of α-ZrP can be promoted, and the formation of other crystal forms (such as γ-ZrP) can be inhibited.

[0029] A third aspect of this invention provides an artificial turf, comprising: flame-retardant artificial grass fibers, a base fabric, and a backing adhesive; the method for preparing the artificial turf includes the following steps: weaving the artificial grass fibers onto the front side of the base fabric in a specified ratio, coating the backing adhesive onto the back side of the base fabric, and drying to obtain the flame-retardant artificial turf. By coating the backing adhesive onto the back side of the base fabric, the adhesive can penetrate and fix the roots of the artificial grass fibers, thereby improving the pull-out force of the artificial grass fibers.

[0030] The present invention will be further described below by way of specific embodiments.

[0031] Unless otherwise specified, the experimental methods used in the following embodiments are conventional methods; unless otherwise specified, the experimental materials used in the following embodiments are all purchased from commercial channels.

[0032] Example 1 ZrOCl2·8H2O and H3PO4 were thoroughly mixed and heated to 200℃ for 15 h. After the reaction was completed, the product was collected by centrifugation, dried under vacuum, and ground into powder to obtain α-ZrP. The mass ratio of ZrOCl2·8H2O to H3PO4 was 1:5.

[0033] α-ZrP was dispersed in water to prepare an α-ZrP dispersion. Melamine was added to the water and heated to fully dissolve it. Phytic acid was then added, and the mixture was heated to 80°C and reacted for 3 hours. After cooling, the α-ZrP dispersion was added, and the mixture was subjected to ultrasonic treatment for 20 minutes. The power density per unit volume was 4 W / cm³. 3 After the process, the product is centrifuged, washed, and vacuum dried to obtain a flame retardant; the mass ratio of phytic acid, melamine, and α-ZrP is 10:3:6.

[0034] By weight, 100 parts of polyethylene resin, 5 parts of flame retardant, 3 parts of color masterbatch and 4 parts of anti-aging masterbatch are thoroughly mixed, melt-extruded at 190°C using a single screw extruder, cooled, and then stretched and shaped using a flat yarn testing machine to obtain artificial grass fibers.

[0035] Artificial grass fibers are woven into the front side of the base fabric in a specific ratio, and adhesive is applied to the back side of the base fabric. After drying, flame-retardant artificial turf is obtained.

[0036] Example 2 ZrOCl2·8H2O and H3PO4 were thoroughly mixed and heated to 220℃ for 20 h. After the reaction was completed, the product was collected by centrifugation, dried under vacuum, and ground into powder to obtain α-ZrP. The mass ratio of ZrOCl2·8H2O to H3PO4 was 1:10.

[0037] α-ZrP was dispersed in water to prepare an α-ZrP dispersion. Melamine was added to the water and heated to fully dissolve it. Phytic acid was then added, and the mixture was heated to 80-100℃ and reacted for 6 hours. After cooling, the α-ZrP dispersion was added, and the mixture was subjected to ultrasonic treatment for 40 minutes. The power density per unit volume was 5 W / cm³. 3 After the process, the product is centrifuged, washed, and vacuum dried to obtain a flame retardant; the mass ratio of phytic acid, melamine, and α-ZrP is 10:6:8.

[0038] By weight, 100 parts of polyethylene resin, 5 parts of flame retardant, 5 parts of color masterbatch and 8 parts of anti-aging masterbatch are thoroughly mixed, melt-extruded at 220°C using a single screw extruder, cooled, and then stretched and shaped using a flat yarn testing machine to obtain artificial grass fibers.

[0039] Artificial grass fibers are woven into the front side of the base fabric in a specific ratio, and adhesive is applied to the back side of the base fabric. After drying, flame-retardant artificial turf is obtained.

[0040] Example 3 Consistent with Example 1, except that, by weight, 100 parts of polyethylene resin, 8 parts of flame retardant, 3 parts of color masterbatch and 4 parts of anti-aging masterbatch are fully mixed, melt-extruded at 190°C using a single screw extruder, cooled, and then stretched and shaped using a flat yarn testing machine to obtain artificial grass fibers.

[0041] Example 4 Consistent with Example 1, except that, by weight, 100 parts of polyethylene resin, 10 parts of flame retardant, 3 parts of color masterbatch and 4 parts of anti-aging masterbatch are fully mixed, melt-extruded at 190°C using a single screw extruder, cooled, and then stretched and shaped using a flat yarn testing machine to obtain artificial grass fibers.

[0042] Example 5 Consistent with Example 1, except that, by weight, 100 parts of polyethylene resin, 13 parts of flame retardant, 3 parts of color masterbatch and 4 parts of anti-aging masterbatch are fully mixed, melt-extruded at 190°C using a single screw extruder, cooled, and then stretched and shaped using a flat yarn testing machine to obtain artificial grass fibers.

[0043] Example 6 Consistent with Example 1, except that, by weight, 100 parts of polyethylene resin, 16 parts of flame retardant, 3 parts of color masterbatch and 4 parts of anti-aging masterbatch are fully mixed, melt-extruded at 190°C using a single screw extruder, cooled, and then stretched and shaped using a flat yarn testing machine to obtain artificial grass fibers.

[0044] Example 7 Consistent with Example 1, except that, by weight, 100 parts of polyethylene resin, 18 parts of flame retardant, 3 parts of color masterbatch and 4 parts of anti-aging masterbatch are fully mixed, melt-extruded at 190°C using a single screw extruder, cooled, and then stretched and shaped using a flat yarn testing machine to obtain artificial grass fibers.

[0045] Example 8 Consistent with Example 1, except that, by weight, 100 parts of polyethylene resin, 20 parts of flame retardant, 3 parts of color masterbatch and 4 parts of anti-aging masterbatch are fully mixed, melt-extruded at 190°C using a single screw extruder, cooled, and then stretched and shaped using a flat yarn testing machine to obtain artificial grass fibers.

[0046] Comparative Example 1 Consistent with Example 1, except that α-ZrP is not added to the flame retardant, which is prepared from phytic acid and melamine. The method for preparing the flame retardant from phytic acid and melamine is the same as in Example 1.

[0047] Comparative Example 2 Consistent with Example 1, except that the flame retardant is α-ZrP, and the preparation method of α-ZrP is the same as in Example 1.

[0048] Performance tests were conducted on Examples 1-8 and Comparative Examples 1 and 2. The specific test contents are as follows: Flame retardant performance test: Take a 230mm×230mm artificial turf sample, fill it with an appropriate amount of quartz sand and rubber granules (the volume ratio of quartz sand and rubber granules is 1:1), and ensure that the height of the exposed grass fibers after filling is 10mm. Conduct a flame retardant test according to Chapter 6 of GB / T 11049-2008. Measure the maximum distance from the center to the damaged edge of each sample, and take the maximum value of the three measurements as the final result.

[0049] Mechanical performance testing: Referring to GB / T 20394-2019 "Artificial Turf for Sports", five grass fibers were randomly selected from different grass clumps and stretched using a tensile testing machine at a speed of 250±50 mm / min. The maximum force value at break was recorded, and the average value of five tests was taken. If the deviation of any result exceeds 30%, the test is repeated.

[0050] Aging resistance test: The sample was subjected to 500 hours of xenon lamp aging. After aging, the tensile strength of the straw was tested again according to the mechanical property test method above, and the retention rate of tensile strength after aging was calculated.

[0051] The test results are shown in Table 1.

[0052] Table 1

[0053] Referring to the flame retardant performance test results in Table 1, the damage distances of Comparative Examples 1 and 2 are significantly larger than those of Example 1, indicating that the flame retardant effect of the flame retardant in Example 1 is better than that of the flame retardants in Comparative Examples 1 and 2. Furthermore, the damage distances of Examples 6 and 7 are smaller than those of the other examples, indicating that the flame retardant effect is better when the content of the flame retardant is 13-16 parts.

[0054] Referring to the mechanical property test results in Table 1, the tensile strength of Example 1 is higher than that of Comparative Examples 1 and 2, while the tensile strength of Example 2 is lower. This indicates that the addition of α-ZrP alone results in poor mechanical properties due to its poor compatibility with polyethylene resin.

[0055] Referring to the aging resistance test results in Table 1, the aging resistance of Examples 1-8 is greater than 98%, indicating that the flame-retardant artificial turf of Examples 1-8 has good aging resistance.

[0056] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," 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 present invention. In this specification, the 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. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0057] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the protection scope of the present invention.

Claims

1. A flame-retardant artificial grass fiber, characterized in that, The artificial grass fibers comprise polyethylene resin and a flame retardant, which is prepared from phytic acid, melamine, and α-ZrP.

2. The flame-retardant artificial grass fibers according to claim 1, characterized in that, In the artificial grass fibers, the content of the flame retardant is 5-20 parts relative to 100 parts by weight of the polyethylene resin.

3. The flame-retardant artificial grass fibers according to claim 1, characterized in that, In the artificial grass fibers, the flame retardant content is 13-16 parts per 100 parts by weight of the polyethylene resin.

4. The flame-retardant artificial turf fiber according to claim 1, characterized in that, The artificial grass fibers also include color masterbatch and anti-aging masterbatch. The content of color masterbatch is 3-5 parts per 100 parts by weight of the polyethylene resin, and the content of anti-aging masterbatch is 4-8 parts per 100 parts by weight. The color masterbatch includes inorganic pigments, and the anti-aging masterbatch includes light stabilizers, ultraviolet absorbers, and antioxidants.

5. The method for preparing flame-retardant artificial turf fibers according to any one of claims 1-4, characterized in that, include: Polyethylene resin, flame retardant, color masterbatch and anti-aging masterbatch are thoroughly mixed, melt-extruded through a single screw extruder, cooled, and then stretched and shaped through a flat yarn testing machine to obtain artificial grass fibers.

6. The preparation method according to claim 5, characterized in that, The method for preparing the flame retardant includes: α-ZrP was dispersed in water to prepare an α-ZrP dispersion. Melamine was added to water and heated to fully dissolve it. Phytic acid was added and the mixture was heated to 80-100°C for 3-6 hours. After cooling, the α-ZrP dispersion was added and subjected to ultrasonic treatment. After the treatment, the mixture was centrifuged, washed, and vacuum dried to obtain the flame retardant.

7. The preparation method according to claim 6, characterized in that, In the preparation method of the flame retardant, the mass ratio of phytic acid, melamine and α-ZrP is 10:(3-6):(6-8).

8. The preparation method according to claim 6, characterized in that, The ultrasonic treatment time is 20-40 minutes, and the power density per unit volume is 4-5 W / cm³. 3 .

9. The preparation method according to claim 6, characterized in that, The preparation method of the α-ZrP includes: Take ZrOCl2·8H2O and H3PO4 and mix them thoroughly. Heat the mixture to 200-220℃ and react for 15-20 hours. After the reaction is complete, collect the product by centrifugation, dry it under vacuum, and grind it into powder to obtain α-ZrP. The mass ratio of ZrOCl2·8H2O to H3PO4 is 1:5-10.

10. An artificial turf, characterized in that, include: The flame-retardant artificial turf fibers, base fabric, and backing adhesive as described in any one of claims 1-4; the method for preparing the artificial turf includes the following steps: Artificial grass fibers are woven into the front side of the base fabric in a specific ratio, and adhesive is applied to the back side of the base fabric. After drying, flame-retardant artificial turf is obtained.

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