Flame-retardant nylon material, method for preparing the same, and hook-and-loop fastener

Abstract

This application relates to the technical field of functional hook and loop fasteners, and more specifically, to a flame-retardant nylon material, its preparation method, and the hook and loop fastener thereof. A flame-retardant nylon material comprises the following raw materials in parts by weight: 60-80 parts nylon 66, 10-20 parts a multifunctional composite flame retardant, and 0.2-1.0 parts a stabilizer; the multifunctional composite flame retardant is obtained by blending a zinc oxide-lignin composite material with piperazine pyrophosphate. The hook and loop fastener prepared from the flame-retardant nylon material of this application possesses both excellent flame-retardant and UV-resistant properties.

Description

Technical Field

[0001] This application relates to the technical field of functional hook and loop fasteners, and more specifically, to a flame-retardant nylon material, its preparation method, and hook and loop fasteners. Background Technology

[0002] Hook and loop fasteners, also known as Velcro, are a commonly used fastening accessory. Hook and loop fasteners typically consist of a hook side and a loop side. When the two sides come into contact and are pressed together, the hooks on the hook side grip the loops on the loop side, creating a strong adhesive force. This adhesive force allows for easy separation and reuse multiple times, making them widely used in clothing, footwear, bags, and household goods.

[0003] Currently, most commonly used hook and loop fasteners are made of nylon. However, nylon has poor flame retardant properties, which can easily cause the fire to spread and lead to larger-scale fire accidents when a fire occurs. Therefore, there is an urgent need for a nylon material with excellent flame retardant properties to be used in hook and loop fasteners. Summary of the Invention

[0004] To improve upon the poor flame retardant properties of conventional nylon hook and loop fasteners, this application provides a flame-retardant nylon material, its preparation method, and the hook and loop fastener itself.

[0005] In a first aspect, this application provides a flame-retardant nylon material, employing the following technical solution:

[0006] A flame-retardant nylon material comprises the following raw materials in parts by weight: 60-80 parts nylon 66, 10-20 parts multifunctional composite flame retardant, and 0.2-1.0 parts stabilizer; wherein the multifunctional composite flame retardant is obtained by blending zinc oxide-lignin composite material with piperazine pyrophosphate.

[0007] Piperazine pyrophosphate is a novel three-in-one environmentally friendly flame retardant that exhibits good flame retardant effects in both the condensed and gas phases. However, its structure contains low levels of phosphorus and carbon elements, while the lignin skeleton contains a large number of aromatic groups. Its carbon content of up to 60% gives it excellent char-forming properties after pyrolysis. Zinc oxide has a catalytic carbonization effect. Therefore, when zinc oxide-lignin composite materials are used in combination with piperazine pyrophosphate, a significant flame retardant effect will be achieved.

[0008] In addition, because nylon materials contain a large number of amide groups, these groups are easily broken by ultraviolet radiation, which leads to the destruction of the molecular structure of nylon and a decline in performance.

[0009] Zinc oxide possesses excellent UV shielding and absorption capabilities, but it also suffers from high polarity, tendency to agglomerate, and poor polymer compatibility. In this application, lignin and zinc oxide are modified through an organic-inorganic hybrid process using a hydrothermal method, effectively improving the compatibility of zinc oxide with polymers. Furthermore, the conjugated carbonyl groups on the lignin branches exhibit strong UV absorption in the 280-380 nm UV region; therefore, when lignin and zinc oxide are used in combination, the flame-retardant nylon material will possess even better UV resistance.

[0010] Preferably, the mass ratio of the zinc oxide-lignin composite material to piperazine pyrophosphate is (1-2):(1-2).

[0011] When zinc oxide-lignin composite material and piperazine pyrophosphate are prepared in the above mass ratio, the resulting flame-retardant nylon material will have better flame-retardant and UV-resistant properties.

[0012] Preferably, the preparation method of the zinc oxide-lignin composite material includes the following steps:

[0013] S1. First, zinc nitrate hexahydrate is dissolved in deionized water to obtain zinc nitrate solution; hexamethylenetetramine is dissolved in deionized water to obtain auxiliary agent solution; the zinc nitrate solution and auxiliary agent solution are mixed to obtain zinc oxide precursor solution.

[0014] S2. Mix the zinc oxide precursor solution with lignin, then put it into a hydrothermal reactor and hydrothermally heat it at 100-150℃ for 4-6 hours. Finally, freeze-dry it to obtain the zinc oxide-lignin composite material.

[0015] Preferably, the preparation method of the zinc oxide-lignin composite material includes the following steps:

[0016] S1. First, dissolve 3-4g of zinc nitrate hexahydrate in 100ml of deionized water to obtain a zinc nitrate solution; dissolve 1-2g of hexamethylenetetramine in 100ml of deionized water to obtain an auxiliary agent solution; mix the zinc nitrate solution and the auxiliary agent solution to obtain a zinc oxide precursor solution.

[0017] S2. Mix 20-30 ml of zinc oxide precursor solution with 100-200 mg of lignin, then put it into a hydrothermal reactor and hydrothermally heat it at 100-150 °C for 4-6 h. Finally, freeze dry to obtain zinc oxide-lignin composite material.

[0018] Preferably, the surface of the zinc oxide-lignin composite material is subjected to a hydrophobic treatment.

[0019] Nylon has strong hygroscopic properties. Therefore, after repeated washing of nylon materials, the multifunctional composite flame retardant is likely to be released with the water. However, after hydrophobic treatment of zinc oxide-lignin composite materials, zinc oxide-lignin composite materials can be more stable in nylon materials, indirectly improving the flame retardant and UV resistance properties of flame-retardant nylon materials.

[0020] Preferably, the hydrophobic surface treatment step of the zinc oxide-lignin composite material is as follows: first, the zinc oxide-lignin composite material is mixed with n-hexane, then 1H,1H,2H,2H-perfluorodecyltrichlorosilane is added and stirred, and then centrifuged, washed and dried to obtain the hydrophobic zinc oxide-lignin composite material.

[0021] Preferably, the mass ratio of the zinc oxide-lignin composite material, n-hexane, and 1H,1H,2H,2H-perfluorodecyltrichlorosilane is (4-10):(40-50):(0.4-0.6).

[0022] Preferably, the stabilizer is a calcium-zinc stabilizer or a barium-zinc stabilizer.

[0023] Secondly, this application provides a method for preparing a flame-retardant nylon material, employing the following technical solution:

[0024] A method for preparing a flame-retardant nylon material includes the following steps: first, mixing nylon 66, a multifunctional composite flame retardant, and a stabilizer, then transferring the mixture to a twin-screw extruder, where it is melt-mixed and extruded at 210-250℃, cooled, granulated, and dried to obtain the flame-retardant nylon material.

[0025] Thirdly, this application provides a Velcro strap, which adopts the following technical solution:

[0026] A type of hook and loop fastener, which is made from the aforementioned flame-retardant nylon material.

[0027] In summary, this application has the following beneficial effects:

[0028] 1. Piperazine pyrophosphate is a novel three-in-one environmentally friendly flame retardant that has good flame retardant effects in both the condensed and gas phases. However, its structure contains low levels of phosphorus and carbon elements, while the lignin skeleton contains a large number of aromatic groups. Its carbon content of up to 60% gives it excellent char-forming properties after pyrolysis. Zinc oxide has a catalytic carbonization effect. Therefore, when zinc oxide-lignin composite materials are used in combination with piperazine pyrophosphate, a significant flame retardant effect will be achieved.

[0029] 2. Zinc oxide possesses excellent UV shielding and absorption capabilities; however, it also suffers from high polarity, tendency to agglomerate, and poor polymer compatibility. In this application, lignin and zinc oxide are modified through an organic-inorganic hybrid process using a hydrothermal method, effectively improving the compatibility of zinc oxide with polymers. Furthermore, the conjugated carbonyl groups on the lignin branches exhibit strong UV absorption in the 280-380 nm UV region; therefore, when lignin and zinc oxide are used in combination, the flame-retardant nylon material will possess superior UV resistance.

[0030] 3. Nylon has strong hygroscopicity. Therefore, after nylon materials are washed multiple times, the multifunctional composite flame retardant is likely to be released with the water. However, after the zinc oxide-lignin composite material is hydrophobically treated, the zinc oxide-lignin composite material can be more stable in nylon materials, which indirectly improves the flame retardant performance and UV resistance of flame retardant nylon materials. Detailed Implementation

[0031] The present application will be further described in detail below with reference to Examples 1-4 and Comparative Examples 1-3.

[0032] raw material

[0033] Nylon 66 DuPont 12T NC010; Piperazine pyrophosphate CAS: 66034-17-1; Zinc nitrate hexahydrate CAS: 10196-18-6; Hexamethylenetetramine CAS: 100-97-0; Lignin CAS: 8068-03-9; n-Hexane CAS: 110-54-3; 1H,1H,2H,2H-Perfluorodecyltrichlorosilane CAS: 78560-44-8; Calcium-zinc stabilizer CZ-113.

[0034] Example 1

[0035] A flame-retardant nylon material comprises the following raw materials by weight: 70g nylon 66, 15g multifunctional composite flame retardant and 0.5g calcium-zinc stabilizer. The multifunctional composite flame retardant is obtained by blending zinc oxide-lignin composite material with piperazine pyrophosphate, and the mass ratio of zinc oxide-lignin composite material to piperazine pyrophosphate is 1:1.

[0036] The preparation method of flame-retardant nylon material is as follows: first, nylon 66, multifunctional composite flame retardant and stabilizer are mixed, then transferred to a twin-screw extruder, melt-mixed and extruded at 240℃, cooled, granulated and dried to obtain flame-retardant nylon material.

[0037] Flame-retardant nylon material is used to process hook and loop fasteners.

[0038] The preparation method of zinc oxide-lignin composite material includes the following steps:

[0039] S1. First, dissolve 3.5g of zinc nitrate hexahydrate in 100ml of deionized water to obtain a zinc nitrate solution; dissolve 1.5g of hexamethylenetetramine in 100ml of deionized water to obtain an auxiliary agent solution; mix the zinc nitrate solution and the auxiliary agent solution to obtain a zinc oxide precursor solution.

[0040] S2. Mix 25 ml of zinc oxide precursor solution with 150 mg of lignin, then put it into a hydrothermal reactor and hydrothermally heat it at 130 °C for 5 h. Finally, freeze dry to obtain zinc oxide-lignin composite material.

[0041] Example 2

[0042] A flame-retardant nylon material comprises the following raw materials by weight: 70g nylon 66, 15g multifunctional composite flame retardant and 0.5g calcium-zinc stabilizer. The multifunctional composite flame retardant is obtained by blending zinc oxide-lignin composite material with piperazine pyrophosphate, and the mass ratio of zinc oxide-lignin composite material to piperazine pyrophosphate is 2:1.

[0043] The preparation method of flame-retardant nylon material is as follows: first, nylon 66, multifunctional composite flame retardant and stabilizer are mixed, then transferred to a twin-screw extruder, melt-mixed and extruded at 240℃, cooled, granulated and dried to obtain flame-retardant nylon material.

[0044] Flame-retardant nylon material is used to process hook and loop fasteners.

[0045] The preparation method of zinc oxide-lignin composite material includes the following steps:

[0046] S1. First, dissolve 3.5g of zinc nitrate hexahydrate in 100ml of deionized water to obtain a zinc nitrate solution; dissolve 1.5g of hexamethylenetetramine in 100ml of deionized water to obtain an auxiliary agent solution; mix the zinc nitrate solution and the auxiliary agent solution to obtain a zinc oxide precursor solution.

[0047] S2. Mix 25 ml of zinc oxide precursor solution with 150 mg of lignin, then put it into a hydrothermal reactor and hydrothermally heat it at 130 °C for 5 h. Finally, freeze dry to obtain zinc oxide-lignin composite material.

[0048] Example 3

[0049] A flame-retardant nylon material comprises the following raw materials by weight: 70g nylon 66, 15g multifunctional composite flame retardant and 0.5g calcium-zinc stabilizer. The multifunctional composite flame retardant is obtained by blending zinc oxide-lignin composite material with piperazine pyrophosphate, and the mass ratio of zinc oxide-lignin composite material to piperazine pyrophosphate is 1:2.

[0050] The preparation method of flame-retardant nylon material is as follows: first, nylon 66, multifunctional composite flame retardant and stabilizer are mixed, then transferred to a twin-screw extruder, melt-mixed and extruded at 240℃, cooled, granulated and dried to obtain flame-retardant nylon material.

[0051] Flame-retardant nylon material is used to process hook and loop fasteners.

[0052] The preparation method of zinc oxide-lignin composite material includes the following steps:

[0053] S1. First, dissolve 3.5g of zinc nitrate hexahydrate in 100ml of deionized water to obtain a zinc nitrate solution; dissolve 1.5g of hexamethylenetetramine in 100ml of deionized water to obtain an auxiliary agent solution; mix the zinc nitrate solution and the auxiliary agent solution to obtain a zinc oxide precursor solution.

[0054] S2. Mix 25 ml of zinc oxide precursor solution with 150 mg of lignin, then put it into a hydrothermal reactor and hydrothermally heat it at 130 °C for 5 h. Finally, freeze dry to obtain zinc oxide-lignin composite material.

[0055] Example 4

[0056] A flame-retardant nylon material comprises the following raw materials by weight: 70g nylon 66, 15g multifunctional composite flame retardant and 0.5g calcium-zinc stabilizer. The multifunctional composite flame retardant is obtained by blending zinc oxide-lignin composite material with piperazine pyrophosphate, and the mass ratio of zinc oxide-lignin composite material to piperazine pyrophosphate is 1:1.

[0057] The preparation method of flame-retardant nylon material is as follows: first, nylon 66, multifunctional composite flame retardant and stabilizer are mixed, then transferred to a twin-screw extruder, melt-mixed and extruded at 240℃, cooled, granulated and dried to obtain flame-retardant nylon material.

[0058] Flame-retardant nylon material is used to process hook and loop fasteners.

[0059] The preparation method of zinc oxide-lignin composite material includes the following steps:

[0060] S1. First, dissolve 3.5g of zinc nitrate hexahydrate in 100ml of deionized water to obtain a zinc nitrate solution; dissolve 1.5g of hexamethylenetetramine in 100ml of deionized water to obtain an auxiliary agent solution; mix the zinc nitrate solution and the auxiliary agent solution to obtain a zinc oxide precursor solution.

[0061] S2. Mix 25 ml of zinc oxide precursor solution with 150 mg of lignin, then put it into a hydrothermal reactor, hydrothermally heat at 130 °C for 5 h, and finally freeze dry to obtain zinc oxide-lignin composite material.

[0062] The surface of the zinc oxide-lignin composite material was then hydrophobically treated.

[0063] The hydrophobic surface treatment steps for zinc oxide-lignin composite material are as follows: First, zinc oxide-lignin composite material is mixed with n-hexane, then 1H,1H,2H,2H-perfluorodecyltrichlorosilane is added and stirred, then centrifuged, washed and dried to obtain hydrophobic zinc oxide-lignin composite material.

[0064] The mass ratio of zinc oxide-lignin composite material, n-hexane, and 1H,1H,2H,2H-perfluorodecyltrichlorosilane is 7:45:0.5.

[0065] Comparative Example 1

[0066] A nylon material comprising the following raw materials by weight: 70g nylon 66 and 0.5g calcium-zinc stabilizer.

[0067] The preparation method of nylon material is as follows: first, nylon 66 and stabilizer are mixed, then transferred to a twin-screw extruder, melt-mixed and extruded at 240°C, cooled, granulated and dried to obtain nylon material.

[0068] Flame-retardant nylon material is used to process hook and loop fasteners.

[0069] Comparative Example 2

[0070] A flame-retardant nylon material comprises the following raw materials by weight: 70g nylon 66, 15g piperazine pyrophosphate and 0.5g calcium-zinc stabilizer.

[0071] The preparation method of flame-retardant nylon material is as follows: first, nylon 66, piperazine pyrophosphate and stabilizer are mixed, then transferred to a twin-screw extruder, melt-mixed and extruded at 240°C, cooled, granulated and dried to obtain flame-retardant nylon material.

[0072] Flame-retardant nylon material is used to process hook and loop fasteners.

[0073] Comparative Example 3

[0074] A flame-retardant nylon material comprises the following raw materials by weight: 70g nylon 66, 15g multifunctional composite flame retardant and 0.5g calcium-zinc stabilizer. The multifunctional composite flame retardant is obtained by compounding lignin and piperazine pyrophosphate, and the mass ratio of lignin to piperazine pyrophosphate is 1:1.

[0075] The preparation method of flame-retardant nylon material is as follows: first, nylon 66, multifunctional composite flame retardant and stabilizer are mixed, then transferred to a twin-screw extruder, melt-mixed and extruded at 240℃, cooled, granulated and dried to obtain flame-retardant nylon material.

[0076] Flame-retardant nylon material is used to process hook and loop fasteners.

[0077] Performance testing

[0078] I. Flame retardant performance test

[0079] Three samples were taken from Examples 1-3 and Comparative Examples 1-3 respectively, and the oxygen index of the above samples was tested according to GB / T2406.2-2009 "Determination of Combustion Behavior by Oxygen Index Method for Plastics", and the average value was taken.

[0080] II. UV Resistance Test

[0081] Six samples were taken from Example 1, Comparative Example 1 and Comparative Example 3 respectively. Then, the original tensile strength of three of the samples was tested in accordance with GB / T 32363.2-2015 "Plastic Polyamide Molding and Extrusion Materials Part 2 Specimen Preparation and Performance Determination". The test data are shown in Table 1.

[0082] Then, the remaining three samples were subjected to ultraviolet aging in accordance with GB / T 16422.3-2014 "Laboratory Light Source Exposure Test Method for Plastics". After that, the tensile strength of the ultraviolet-aged samples was tested again in accordance with GB / T 32363.2-2015 "Plastic Polyamide Molding and Extrusion Materials Part 2 Specimen Preparation and Performance Determination".

[0083] Finally, the aging value was calculated as follows: Aging value = Aging tensile strength / Original tensile strength × 100%. The test data are shown in Table 2.

[0084] III. Hydrophobicity Test

[0085] Nine samples were taken from Examples 1 and 4 respectively, and then mixed and stirred in deionized water for 48 hours. After drying, the oxygen index and aging value of the samples were tested according to the above flame retardant performance test and UV resistance performance test. The test data are shown in Table 3.

[0086] Table 1. Flame retardant performance test table for Examples 1-3 and Comparative Examples 1-3

[0087]

[0088] Table 2. UV resistance performance of Example 1, Comparative Example 1, and Comparative Example 3.

[0089]

[0090] Table 4 Comparison of hydrophobic properties between Example 1 and Example 4

[0091]

[0092] Referring to Example 1, Comparative Examples 1-3, and Table 1, it can be seen that the oxygen index of Comparative Example 2 is significantly improved compared to Comparative Example 1, indicating that the addition of piperazine pyrophosphate can effectively improve the flame retardant properties of nylon materials. Compared to Comparative Example 2, the oxygen index of Comparative Example 3 is further improved, indicating that when piperazine pyrophosphate is used in combination with lignin, the resulting nylon material will have even better flame retardant properties. Compared to Comparative Example 3, the oxygen index of Example 1 is further improved, indicating that the loading of nano-zinc oxide can further improve the flame retardant properties of nylon materials.

[0093] The reason for this is that piperazine pyrophosphate is a novel three-in-one environmentally friendly flame retardant that has good flame retardant effects in both the condensed and gas phases. However, its structure contains low levels of phosphorus and carbon elements, while the lignin skeleton contains a large number of aromatic groups. Its carbon content of up to 60% gives it excellent char-forming properties after pyrolysis. Zinc oxide has a catalytic carbonization effect. Therefore, when zinc oxide-lignin composite materials are used in combination with piperazine pyrophosphate, a significant flame retardant effect will be achieved.

[0094] Referring to Examples 1-3 and in conjunction with Table 1, it can be seen that Example 1 has a higher oxygen index than Examples 2 and 3. This indicates that when the zinc oxide-lignin composite material and piperazine pyrophosphate are prepared in the mass ratio of Example 1, the resulting nylon material will have better flame retardant properties.

[0095] In addition, referring to Example 1, Comparative Example 1 and Comparative Example 3 and in conjunction with Table 2, it can be seen that the aging value of Comparative Example 3 is significantly improved compared to Comparative Example 1, and the aging value of Example 1 is further improved compared to Comparative Example 3. This indicates that the loading of lignin and nano zinc oxide can further improve the UV resistance of nylon materials.

[0096] The reason for this is that nylon materials contain a large number of amide groups. When these groups are exposed to ultraviolet light, the chemical bonds of these groups are easily broken, which leads to the destruction of the molecular structure of nylon and a decline in its performance.

[0097] Zinc oxide possesses excellent UV shielding and absorption capabilities, but it also suffers from high polarity, tendency to agglomerate, and poor polymer compatibility. In this application, lignin and zinc oxide are modified through an organic-inorganic hybrid process using a hydrothermal method, effectively improving the compatibility of zinc oxide with polymers. Furthermore, the conjugated carbonyl groups on the lignin branches exhibit strong UV absorption in the 280-380 nm UV region; therefore, when lignin and zinc oxide are used in combination, the flame-retardant nylon material will possess even better UV resistance.

[0098] Referring to Examples 1 and 4 and in conjunction with Table 3, it can be seen that, compared to Example 1, the oxygen index and aging value after washing are relatively higher in Example 4. This indicates that hydrophobic treatment of the surface of zinc oxide-lignin composite material can indirectly improve the flame retardant and UV resistance properties of nylon material after washing.

[0099] The reason for this is that nylon has strong hygroscopicity. Therefore, after nylon materials are washed multiple times, the multifunctional composite flame retardant is likely to be released with the water. However, after the zinc oxide-lignin composite material is hydrophobically treated, the zinc oxide-lignin composite material can be more stable in nylon materials, which indirectly improves the flame retardant performance and UV resistance of flame retardant nylon materials.

[0100] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A flame-retardant nylon material, characterized in that, The raw materials include the following parts by weight: 60-80 parts nylon 66, 10-20 parts multifunctional composite flame retardant, and 0.2-1.0 parts stabilizer; the multifunctional composite flame retardant is obtained by blending zinc oxide-lignin composite material with piperazine pyrophosphate. The preparation method of the zinc oxide-lignin composite material includes the following steps: S1. First, zinc nitrate hexahydrate is dissolved in deionized water to obtain zinc nitrate solution; hexamethylenetetramine is dissolved in deionized water to obtain auxiliary agent solution; the zinc nitrate solution and auxiliary agent solution are mixed to obtain zinc oxide precursor solution. S2. Mix the zinc oxide precursor solution with lignin, then put it into a hydrothermal reactor and hydrothermally heat it at 100-150℃ for 4-6 hours. Finally, freeze-dry it to obtain the zinc oxide-lignin composite material.

2. The flame retardant nylon material of claim 1, wherein: The mass ratio of the zinc oxide-lignin composite material to piperazine pyrophosphate is (1-2):(1-2).

3. The flame retardant nylon material of claim 1, wherein, The preparation method of the zinc oxide-lignin composite material includes the following steps: S1. First, dissolve 3-4g of zinc nitrate hexahydrate in 100ml of deionized water to obtain a zinc nitrate solution; dissolve 1-2g of hexamethylenetetramine in 100ml of deionized water to obtain an auxiliary agent solution; mix the zinc nitrate solution and the auxiliary agent solution to obtain a zinc oxide precursor solution. S2. Mix 20-30 ml of zinc oxide precursor solution with 100-200 mg of lignin, then put it into a hydrothermal reactor and hydrothermally heat it at 100-150 °C for 4-6 h. Finally, freeze dry to obtain zinc oxide-lignin composite material.

4. The flame retardant nylon material of claim 1, wherein: The surface of the zinc oxide-lignin composite material is hydrophobically treated.

5. The flame-retardant nylon material according to claim 4, characterized in that: The hydrophobic surface treatment steps for the zinc oxide-lignin composite material are as follows: First, the zinc oxide-lignin composite material is mixed with n-hexane, then 1H,1H,2H,2H-perfluorodecyltrichlorosilane is added and stirred continuously, followed by centrifugation, washing and drying to obtain the hydrophobic zinc oxide-lignin composite material.

6. The flame retardant nylon material of claim 5, wherein: The mass ratio of the zinc oxide-lignin composite material, n-hexane, and 1H,1H,2H,2H-perfluorodecyltrichlorosilane is (4-10):(40-50):(0.4-0.6).

7. The flame retardant nylon material of claim 5, wherein: The stabilizer is a calcium-zinc stabilizer or a barium-zinc stabilizer.

8. A process for the preparation of a flame retardant nylon material as claimed in any one of claims 1 to 7, characterized in that, The steps are as follows: First, Nylon 66, multifunctional composite flame retardant and stabilizer are mixed, and then transferred to a twin-screw extruder, where they are melt-mixed and extruded at 210-250℃, cooled, granulated and dried to obtain flame-retardant nylon material.

9. A hook and loop fastener characterized by It is processed from the flame-retardant nylon material as described in any one of claims 1-7.

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