Halogen-free flame retardant material and method for forming the same

Abstract

The present invention provides a method for forming a halogen-free flame retardant material, comprising: using a twin-screw extruder comprising a first zone and a second zone; mixing and melt-heating a mixture in the first zone to form a molten mixture, wherein the mixture comprises a halogen-free flame retardant, a wear-resistant modifier, a thermoplastic elastomer, and an antioxidant; and introducing a silane-modified nano-silica suspension into the second zone to mix the silane-modified nano-silica suspension with the molten mixture from the first zone, wherein the first zone and the second zone are continuously connected areas.

Description

Technical Field

[0001] The invention relates to a halogen-free flame retardant material and a forming method thereof, and to a process for mixing a silane-modified nano-silicon dioxide suspension with a molten mixture using twin-screw extruders in different zones. Background Art

[0002] Wires and cables are ubiquitous in our daily lives, with PVC being the predominant coating material, and the rest primarily cross-linked plastics and rubbers. However, these materials are often considered environmentally unfriendly because they produce toxic substances during processing or are difficult to recycle. Therefore, the use of more easily recyclable thermoplastic elastomers in combination with halogen-free flame retardants has become a trend. However, thermoplastic elastomers, when used in wires and cables that emphasize flexibility, exhibit a significant lack of wear resistance. Therefore, combining thermoplastic elastomers with nanopowders is considered an important approach to improve the wear resistance and mechanical strength of coating materials. However, nanopowders are inherently difficult to disperse in thermoplastic elastomers.

[0003] In summary, new material compositions and processing methods are urgently needed to overcome the above-mentioned shortcomings of poor dispersibility and meet the requirements of environmentally friendly materials with high wear resistance, halogen-free, and high flame retardancy. Summary of the Invention

[0004] According to an embodiment of the present invention, a method for forming a halogen-free flame retardant material includes: using a twin-screw extruder including a first zone and a second zone; mixing and melt-heating a mixture in the first zone to form a molten mixture, wherein the molten mixture includes a halogen-free flame retardant, a wear-resistant modifier, a thermoplastic elastomer, and an antioxidant; and introducing a silane-modified nano-silica suspension into the second zone to mix the silane-modified nano-silica suspension with the molten mixture from the first zone, wherein the first zone and the second zone are continuously connected areas.

[0005] According to another embodiment of the present invention, a halogen-free flame retardant material is prepared using the above-mentioned formation method, wherein the wear resistance of the halogen-free flame retardant material is less than 40 mg, the Shore A hardness is less than 85, and the tensile strength is greater than 120 kgf / cm 2 , elongation greater than 300% and flame retardancy reaches UL94 V-0 grade when the sample thickness is 0.8mm.

[0006] According to another embodiment of the present invention, a wear-resistant halogen-free flame-retardant cable covering material comprises the above-mentioned halogen-free flame-retardant material.

[0007] In order to make the above features and advantages of the present invention more obvious and easy to understand, embodiments are given below to describe them in detail. DETAILED DESCRIPTION

[0008] One embodiment of the present invention provides a method for forming a halogen-free flame-retardant material, comprising: using a twin-screw extruder comprising a first zone and a second zone, wherein the first zone and the second zone are continuously connected; mixing and melt-heating a mixture in the first zone to form a molten mixture, wherein the mixture includes a halogen-free flame retardant, a wear-resistant modifier, a thermoplastic elastomer, and an antioxidant; then, introducing a silane-modified nano-silica suspension into the second zone and mixing the silane-modified nano-silica suspension with the molten mixture from the first zone.

[0009] In some embodiments, the silane-modified nano-silica suspension includes silane, nano-silica powder, and water.

[0010] In some embodiments, the halogen-free flame retardant includes a phosphorus-nitrogen flame retardant, phenyl aluminum hypophosphite, aluminum hypophosphite, melamine urate, amine phosphate, or phosphate ester. The wear-resistant modifier can be a siloxane polymer, vinyl polydimethylsiloxane, or polymethylsiloxane silsesquioxane crosslinked polymer. The thermoplastic elastomer includes a polyether thermoplastic polyurethane, a polyester thermoplastic polyurethane, a polyether polyether ester elastomer, or a polyester polyether ester elastomer. The antioxidant includes a hindered phenol antioxidant, bis[3-(1,1-dimethylethyl)-4-hydroxy-5-methylphenylpropionic acid] triethylene glycol, or a hindered phenol composite antioxidant.

[0011] In some embodiments, the mixture may further include a volume resistivity-enhancing modified elastomer, such as a styrene-ethylene / butylene-styrene copolymer thermoplastic elastomer or a polyolefin elastomer.

[0012] In some embodiments, based on 100 parts by weight of the total weight of the mixture, the content of the halogen-free flame retardant is 15 to 45 parts by weight, for example, about 15 to 40, about 15 to 30, about 15 to 20, etc., but is not limited thereto.

[0013] In some embodiments, based on 100 parts by weight of the thermoplastic elastomer, the content of the wear-resistant modifier is 1 to 10 parts by weight, for example, about 1 to 7, about 1 to 5, etc., but is not limited thereto.

[0014] In some embodiments, based on 100 parts by weight of the thermoplastic elastomer, the antioxidant content is 0.2 to 1.5 parts by weight, for example, about 0.2 to 0.7 parts by weight, about 0.2 to 0.5 parts by weight, etc., but is not limited thereto.

[0015] In some embodiments, based on 100 parts by weight of the total mixture, the content of the nano-silica powder is 0.5 to 12 parts by weight, for example, about 0.5 to 10 parts by weight, about 0.5 to 5 parts by weight, etc., but not limited thereto.

[0016] In some embodiments, based on 100 parts by weight of the total weight of the above mixture, the content of the volume resistivity enhanced modified elastomer is 5 to 30 parts by weight, for example, about 5 to 20 parts by weight, about 5 to 10 parts by weight, etc., but is not limited thereto.

[0017] In certain embodiments, the formation method of above-mentioned silane-modified nano-silica suspension may comprise: at normal temperature, nano-silica powder is added to deionized water and stirred to form a nano-silica mixed aqueous solution, then the pH value of the nano-silica mixed aqueous solution adjustment is to neutrality by sequentially adding the KOH of 20ml 1M of alkali solution and the HCl of 20ml 1M of acid solution. After filtration and drying, 7.5g of silane, 2.5g of suspending agent, 500g of water and above-mentioned treated nano-silica are mixed and stirred to form a silane-modified nano-silica suspension. For example, silane can be 3-glycidoxypropyltrimethoxysilane (GPTMS), hexamethyldisilane (HMDS), vinyltriethoxysilane (VTES), polydimethylsiloxane (PDMS).

[0018] In some embodiments, the temperature of the first zone of the twin-screw extruder is set to 120-200°C, and the temperature of the second zone of the twin-screw extruder is set to 120-200°C.

[0019] In some embodiments, the pump pressure used to introduce the silane-modified nano-silica suspension into the second zone may be 20 to 50 bar. If the pump pressure is too high, the torque of the twin-screw extruder will be high, which will increase energy consumption. If the pump pressure is too low, it will be impossible to maintain a stable flow of the 3-glycidoxypropyltrimethoxysilane-modified nano-silica suspension into the twin-screw extruder.

[0020] In some embodiments, the screw speed is 60 rpm to 300 rpm. In some embodiments, the halogen-free flame retardant material prepared by the above-mentioned forming method can obtain a wear resistance of less than 40 mg, a Shore A hardness of less than 85, and a hardness greater than 120 kgf / cm 2 The tensile strength and elongation of more than 300% and flame retardancy of the material reached UL94 V-0 at a sample thickness of 0.8mm. Therefore, the wear-resistant halogen-free flame-retardant cable sheathing material containing the above-mentioned halogen-free flame-retardant material also has the technical benefits of low hardness, high wear resistance, and high flame retardancy.

[0021] The following examples are given to verify the effects of the present invention, but the present invention is not limited to the following contents.

[0022] [Preparation Example]

[0023] [Preparation Example 1]

[0024] Get the nano silicon dioxide powder of 100 grams (available from Hengzhou Industry, Aerosil 200,100~500nm), after above-mentioned nano silicon dioxide powder and the KOH of 100ml 1M were mixed 2 hours, then added the HCl of 10 to 50ml 1M to adjust the pH value of the nano silicon dioxide mixed aqueous solution to neutrality.After filtration oven dry, the deionized water of above-mentioned treated nano silicon dioxide and 1.5 grams of 3-glycidoxypropyltrimethoxysilane (GPTMS) (available from Jing Ming Chemical), 1.25 grams of suspending agents and 250 grams is stirred, and is about the 3-glycidoxypropyltrimethoxysilane modified nano silicon dioxide suspension of 40wt% to form concentration.Expectation, after modification, will form the surface of the silane grafted thing coating nano silicon dioxide.

[0025] [Preparation Example 2]

[0026] A modified nanosilica suspension was prepared using the method of Preparation Example 1, except that the GPTMS was replaced with hexamethyldisilane (HMDS) (purchased from Chongxin Trading) to form a hexamethyldisilane-modified nanosilica suspension with a concentration of approximately 40 wt%. It is expected that after modification, a silane graft will be formed to coat the surface of the nanosilica.

[0027] [Comparative Preparation Example 1]

[0028] The nano-silica suspension was prepared in the manner of Preparation Example 1, but without adding silane for modification.

[0029] [Example]

[0030] [Examples 1 to 6]

[0031] Raw materials: thermoplastic polyurethane (purchased from Gaoding Chemical, ER-85A), halogen-free flame retardant (purchased from Fuyuan Trade, SONGFLAM-203), siloxane polymer (purchased from DuPont, model MB50-017), antioxidant (purchased from BASF, model Irganox-245) and the suspension of Preparation Example 1.

[0032] According to the proportions shown in Table 1, a mixture comprising thermoplastic polyurethane (TPU), a halogen-free flame retardant, a silicone polymer, and an antioxidant was fed directly from the main feed port of a twin-screw extruder into the first zone of the extruder. The mixture was mixed and melt-heated at a temperature of 120° C. to 180° C. and a screw speed of 250 rpm to form a molten mixture.

[0033] Using a high-pressure pump at a pressure of 40 bar, the 3-glycidoxypropyltrimethoxysilane-modified nanosilica (Nano-SiO2) suspension obtained in Preparation Example 1 was introduced into the second zone of a twin-screw extruder through the side feed port, according to the proportions shown in Table 1, and mixed with the molten mixture from the connected first zone. The temperature of the side feed port was 180°C, the temperature of the second zone was 200°C, and the screw speed was 250 rpm. During the process, the flow rate of the suspension of Preparation Example 1 was controlled by a flow controller so that the raw material ratios in the mixture retained after passing through the second zone met those shown in Table 1. The above mixture was then stretched and pelletized through a twin-screw extruder and placed in a 105°C oven for 4 hours to produce a halogen-free flame retardant material. The resulting halogen-free flame retardant material was tested for mechanical properties, flame retardancy, and abrasion resistance, and the results are also shown in Table 1.

[0034] [Comparative Example 1]

[0035] The halogen-free flame retardant material was prepared in the manner of Example 1, but the suspension of Preparation Example 1 was not added, and the proportions of the remaining raw materials were as shown in Table 1.

[0036] Then, the halogen-free flame retardant material of Comparative Example 1 was subjected to mechanical property tests, flame retardancy tests, and abrasion resistance tests. The results are also shown in Table 1.

[0037] [Comparative Example 2]

[0038] The halogen-free flame retardant material was prepared in the manner of Example 1, but the content of the 3-glycidoxypropyltrimethoxysilane-modified nano-silica in Preparation Example 1 exceeded 5 parts by weight.

[0039] Then, the halogen-free flame retardant material of Comparative Example 2 was subjected to mechanical property tests, flame retardancy tests, and abrasion resistance tests. The results are also shown in Table 1.

[0040] Table 1

[0041]

[0042] phr: parts by weight added per 100 parts by weight of thermoplastic resin.

[0043] It can be seen from Table 1 that the halogen-free flame retardant material of the present invention has good wear resistance and excellent flame retardant effect.

[0044] [Examples 7 to 10]

[0045] The halogen-free flame retardant material was prepared in the manner of Example 1, wherein the contents of thermoplastic polyurethane, halogen-free flame retardant, suspension of Preparation Example 1 and antioxidant were fixed according to the proportions in Table 2, and the content of siloxane polymer of Preparation Example 1 was changed.

[0046] Then, the halogen-free flame retardant materials prepared in Examples 7 to 10 were subjected to mechanical property tests, flame retardancy tests, and abrasion resistance tests. The results are shown in Table 2 together with the values ​​of Example 3.

[0047] Table 2

[0048] Example 3 Example 7 Example 8 Example 9 Example 10 TPU (parts by weight) 80 80 80 80 80 Halogen-free flame retardant (parts by weight) 18 18 18 18 18 <![CDATA[Nano - SiO2 (parts by weight)]]> 2 2 2 2 2 Antioxidants (phr) 0.3 0.3 0.3 0.3 0.3 Siloxane polymer (phr) 1 2 3 4 5 Shore A hardness 84 82 82 81 81 <![CDATA[Tensile strength (kgf / cm 2 )]]> 212 190 189 162 147 Elongation (%) 569 596 622 589 543 Flame retardant (UL94 0.8mm) V-0 V-0 V-0 V-0 V-0 Wear resistance (mg) 22 28 27 23 22

[0049] As can be seen from Table 2, the siloxane polymer in the halogen-free flame retardant material of the present invention can achieve excellent wear resistance at 1 to 5 phr, and also has excellent flame retardant effect and other mechanical properties.

[0050] [Examples 11-12]

[0051] The halogen-free flame retardant material was prepared in the manner of Example 1, wherein styrene-ethylene / butylene-styrene copolymer (SEBS) thermoplastic elastomer (purchased from Taiwan Rubber Corporation, taipol6150) was added to the first zone of the twin-screw extruder according to the proportions in Table 3.

[0052] Then, the halogen-free flame retardant materials prepared in Examples 11-12 were subjected to mechanical property tests, flame retardancy tests, abrasion resistance tests, and volume resistivity tests. The results are also shown in Table 3.

[0053] Table 3

[0054] Example 11 Example 12 TPU (parts by weight) 75 70 Halogen-free flame retardant (parts by weight) 18 18 SEBS (parts by weight) 5 10 <![CDATA[Nano - SiO2 (parts by weight)]]> 2 2 Antioxidant (phr) 0.3 0.3 Siloxane polymer (phr) 2 2 Shore A hardness 83 83 <![CDATA[Tensile strength (kgf / cm 2 )]]> 210 183 Elongation (%) 556 569 Flame retardant (UL94 0.8mm) V-0 V-0 Wear resistance (mg) 38 35 Volume resistivity (Ω·cm) 1.2E+13 1.3E+13

[0055] As can be seen from Table 3, the halogen-free flame retardant material of the present invention can further improve the volume resistivity by adding SEBS, and the wear resistance is still better than that of Comparative Examples 1 and 2.

[0056] The following Comparative Examples 3 to 5 are intended to explore the effects of nano-silica on mechanical strength and wear resistance, and therefore do not contain halogen-free flame retardants and siloxane polymers.

[0057] [Comparative Example 3]

[0058] Raw materials: thermoplastic polyurethane (purchased from Gaoding Chemical, ER-85A), nano-silica (purchased from Hengzhou Industrial, aerosil 200, 100-500 nm) and antioxidant (purchased from BASF, Irganox-245).

[0059] According to the proportions in Table 4, thermoplastic polyurethane (TPU), nanosilica, and antioxidant were directly introduced from the main feed port of a twin-screw extruder into the first zone and the connected second zone. Mixing and melt-heating were performed at a temperature of 120-200° C. and a screw speed of 250 rpm to form a molten mixture.

[0060] The mixture was extruded through a twin-screw extruder, pelletized, and then dried in a 105°C oven for 4 hours to produce a composition free of halogen-free flame retardants and siloxane polymer. Mechanical properties and abrasion resistance tests were performed on the halogen-free composition, and the results are also shown in Table 4.

[0061] [Comparative Example 4]

[0062] The halogen-free composition was prepared in the same manner as in Comparative Example 3, except that nanoclay (purchased from nanocor, PGN, 5-20 nm) was used instead of nanosilica.

[0063] The mechanical properties and abrasion resistance tests were then performed on the prepared composition without the halogen-free flame retardant and the siloxane polymer. The results are also shown in Table 4.

[0064] [Comparative Example 5]

[0065] Raw materials: thermoplastic polyurethane (purchased from Gaoding Chemical, ER-85A), the nano-silica suspension not modified by silane of Comparative Preparation Example 1, and an antioxidant (purchased from BASF, Irganox-245).

[0066] According to the ratios shown in Table 4, thermoplastic polyurethane (TPU) and antioxidant were directly introduced into the first zone of a twin-screw extruder from the main feed port of the twin-screw extruder. The mixture was mixed and melt-heated at a temperature of 120-200° C. and a screw speed of 250 rpm to form a molten mixture.

[0067] Using a high-pressure pump at a pressure of 40 bar, the nanosilica suspension obtained in Comparative Preparation Example 1 was introduced into the second zone of a twin-screw extruder through a side feed port and mixed with the molten mixture from the connected first zone. The side feed port temperature was 180°C, the second zone temperature was 200°C, and the screw speed was 250 rpm. During this process, a flow controller controlled the flow rate of the suspension from Comparative Preparation Example 1 so that the raw material ratios in the mixture remaining after passing through the second zone met those shown in Table 4. The mixture was then stranded, water-granulated, and dried in a 105°C oven for 4 hours to produce a composition free of halogen-free flame retardants and siloxane polymers.

[0068] Then, the mechanical property test and the wear resistance test were performed on the prepared halogen-free composition. The results are also shown in Table 4.

[0069] [Comparative Example 6]

[0070] A composition not containing a halogen-free flame retardant and a siloxane polymer was prepared in the manner of Comparative Example 5, except that the HMDS-modified nano-silica suspension of Preparation Example 2 was used instead of the nano-silica suspension of Comparative Example 5.

[0071] The mechanical properties and abrasion resistance tests were then performed on the prepared composition without the halogen-free flame retardant and the siloxane polymer. The results are also shown in Table 4.

[0072] [Comparative Example 7]

[0073] A composition not containing a halogen-free flame retardant and a siloxane polymer was prepared in the manner of Comparative Example 5, except that the nano-silica suspension modified with GPTMS of Preparation Example 1 was used instead of the nano-silica suspension of Comparative Example 5.

[0074] The mechanical properties and abrasion resistance tests were then performed on the prepared composition without the halogen-free flame retardant and the siloxane polymer. The results are also shown in Table 4.

[0075] [Comparative Example 8]

[0076] A composition without halogen-free flame retardant and siloxane polymer was prepared in the manner of Comparative Example 7, but with the suspension content of Preparation Example 1 increased.

[0077] The mechanical properties and abrasion resistance tests were then performed on the prepared composition without the halogen-free flame retardant and the siloxane polymer. The results are also shown in Table 4.

[0078] Table 4

[0079]

[0080] As shown in Table 4, water-dispersed Comparative Examples 5-7 exhibited superior mechanical strength, while silane-modified Comparative Examples 6-7 exhibited superior abrasion resistance. Therefore, it can be inferred that the halogen-free flame-retardant material of the present invention can achieve superior abrasion resistance when using a silane-modified nanosilica suspension.

[0081] [Comparative Example 9]

[0082] 95 parts by weight of thermoplastic polyurethane (ER-85A, purchased from Gaoding Chemical) was introduced into the first zone of a twin-screw extruder through the main feed port and melt-heated at a temperature of 120-200° C. and a screw speed of 250 rpm. Next, the 3-glycidoxypropyltrimethoxysilane-modified nanosilica suspension obtained in Preparation Example 1 was introduced into the second zone of the twin-screw extruder through the side feed port of the twin-screw extruder using a high-pressure pump at a pressure of 20 to 50 bar and mixed with the molten thermoplastic polyurethane from the connected first zone. The side feed port temperature was set to 180° C., the temperature of the second zone was 200° C., and the screw speed was 250 rpm. During the process, the flow rate of the 3-glycidoxypropyltrimethoxysilane-modified nano-silica suspension of Preparation Example 1 was controlled by a flow controller, so that the 3-glycidoxypropyltrimethoxysilane-modified nano-silica retained after passing through the second zone was mixed with the molten thermoplastic polyurethane from the connected first zone to obtain a material with a total weight of 100 parts, of which the weight part of the 3-glycidoxypropyltrimethoxysilane-modified nano-silica was 5 parts.

[0083] In the experiment, it was observed that the 3-glycidoxypropyltrimethoxysilane-modified nano-silica suspension of Preparation Example 1 flowed into the second zone of the twin-screw extruder from the side feed port of the twin-screw extruder, showing a stable flow rate, and the current value measured by the twin-screw extruder was converted into a torque value, obtaining a stable torque value of 55%.

[0084] [Comparative Examples 10-11]

[0085] The method of Comparative Example 9 was adopted, but the set pressure of the high-pressure pump was changed to 18 bar and 52 bar respectively.

[0086] The experiment observed that the flow rate of Comparative Example 10 was large and unstable, with a torque value of approximately 48%. Therefore, when the pressure of the high-pressure pump was less than 20 bar, it was impossible to maintain a stable nano-silica suspension before entering the twin-screw extruder.

[0087] Although Comparative Example 11 exhibits a stable flow rate, the torque value is relatively high (about 60%), indicating that when the pressure of the high-pressure pump is greater than 50 bar, the current value of the twin-screw extruder increases, indicating higher energy consumption.

[0088] In summary, the silane-modified nano-silica suspension of the present invention exhibits excellent dispersibility. By incorporating water-dispersible nano-silica technology into a twin-screw extruder design, the surface-modified nano-silica is pressurized in the form of an aqueous solution and then pumped into a twin-screw granulator. It is then blended and dispersed with a well-dispersed molten mixture (containing a halogen-free flame retardant, a wear-resistant modifier, a thermoplastic elastomer, and an antioxidant) to produce a halogen-free flame-retardant material with excellent overall performance, including low hardness, high wear resistance, and high flame retardancy. This material is suitable for use as a wear-resistant, halogen-free, flame-retardant cable sheathing material.

[0089] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for forming a halogen-free flame retardant material, characterized in that: include: Using a twin-screw extruder comprising a first zone and a second zone; Mixing and melting the heated mixture in the first zone to form a molten mixture, wherein the mixture includes a halogen-free flame retardant, a wear-resistant modifier, a thermoplastic elastomer, and an antioxidant; and Introducing a silane-modified nano-silica suspension into the second zone, mixing the silane-modified nano-silica suspension with the molten mixture from the first zone, wherein the first area and the second area are continuously connected areas; The silane-modified nano-silica suspension comprises silane, nano-silica powder and water, wherein the silane is 3-glycidoxypropyltrimethoxysilane or vinyltriethoxysilane; The content of the nano-silicon dioxide powder is 0.5 to 10 parts by weight based on 100 parts by weight of the total weight of the mixture; The pump pressure for introducing the silane-modified nano-silica suspension into the second zone is 20 to 50 bar.

2. The method for forming a halogen-free flame retardant material according to claim 1, wherein: The mixture also includes a volume resistance increasing modified elastomer.

3. The method for forming a halogen-free flame retardant material according to claim 1, wherein: The halogen-free flame retardant comprises phosphorus-nitrogen flame retardant, phenyl aluminum hypophosphite, aluminum hypophosphite, melamine urate or phosphate ester.

4. The method for forming a halogen-free flame retardant material according to claim 1, wherein: The wear modifier comprises a silicone polymer.

5. The method for forming a halogen-free flame retardant material according to claim 1, wherein: The thermoplastic elastomer includes polyether thermoplastic polyurethane, polyester thermoplastic polyurethane, polyether polyether ester elastomer or polyester polyether ester elastomer.

6. The method for forming a halogen-free flame retardant material according to claim 1, wherein: The antioxidant comprises di[3-(1,1-dimethylethyl)-4-hydroxy-5-methylphenylpropionic acid]triethylene glycol or hindered phenol composite antioxidant.

7. The method for forming a halogen-free flame retardant material according to claim 2, wherein: The volume resistance-enhanced modified elastomer comprises styrene-ethylene / butylene-styrene copolymer thermoplastic elastomer or polyolefin elastomer.

8. The method for forming a halogen-free flame retardant material according to claim 1, wherein: Based on 100 parts by weight of the total weight of the mixture, the content of the halogen-free flame retardant is 15 to 45 parts by weight.

9. The method for forming a halogen-free flame retardant material according to claim 1, wherein: Based on 100 parts by weight of the thermoplastic elastomer, the content of the wear-resistant modifier is 1 to 10 parts by weight.

10. The method for forming a halogen-free flame retardant material according to claim 1, wherein: Based on 100 parts by weight of the thermoplastic elastomer, the content of the antioxidant is 0.2 to 1.5 parts by weight.

11. The method for forming a halogen-free flame retardant material according to claim 2, wherein: The content of the volume resistance-enhancing modified elastomer is 5 to 30 parts by weight based on 100 parts by weight of the total weight of the mixture.

12. The method for forming a halogen-free flame retardant material according to claim 1, wherein: The temperature of the first zone of the twin-screw extruder is 120°C to 200°C.

13. The method for forming a halogen-free flame retardant material according to claim 1, wherein: The temperature of the second zone of the twin-screw extruder is 120°C to 200°C.

14. The method for forming a halogen-free flame retardant material according to claim 1, wherein: The screw speeds of the first zone and the second zone of the twin-screw extruder are 60 rpm to 300 rpm.

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