Halogen-free flame-retardant thermoplastic elastomer material easy for ink printing as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of thermoplastic elastomer materials, and relates to a halogen-free flame-retardant thermoplastic elastomer material easy for ink printing as well as a preparation method and application thereof. The thermoplastic elastomer material is processed from the following raw materials in parts by weight: 15 to 35 parts of styrene thermoplastic elastomer, 15 to 30 parts of polyolefin resin, 10 to 30 parts of polar plasticizer, 5 to 15 parts of polyphenyl ether, 25 to 40 parts of flame retardant, 0.1 to 0.5 part of antioxidant, 0.5 to 1.5 parts of ultraviolet screening agent and 0.5 to 2 parts of processing aid. The thermoplastic elastomer with high styrene content is used as a matrix and has a synergistic effect with the maleic anhydride grafted polyolefin lubricating oil and the polyphenyl ether, so that the polarity of the material can be effectively improved, the interaction force between the material and the ink is improved, and the printing firmness and the adhesive force of the ink are enhanced; meanwhile, the compatibility of a material system can be improved, and the overall strength performance of the material is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of thermoplastic elastomer materials, and relates to an ink-easy-printable halogen-free flame-retardant thermoplastic elastomer material and a preparation method and application thereof. Background Art

[0002] Thermoplastic elastomers (TPE) are a type of polymer material with rubber elasticity and thermoplastic processing properties, known as the "third generation of rubber". They combine the elasticity of traditional vulcanized rubber and the processing convenience of thermoplastics, becoming an ideal substitute. In particular, TPE based on SEBS (hydrogenated styrene-ethylene-butylene-styrene block copolymer) not only has excellent mechanical properties, but is also easy to process, has good elasticity, comfortable feel, a wide operating temperature range, and excellent weather resistance. In addition, this type of material does not contain halogens and phthalate plasticizers, and is recyclable and reusable, so it also performs well in terms of environmental protection. These characteristics make TPE widely used in a variety of industrial products, including automotive parts, medical devices, sporting goods, toys, wires and cables, etc.

[0003] However, the main substrates of TPE, SEBS, polyolefins and white oil, all have saturated alkane structures as molecular structures and are non-polar materials. Such non-polar materials generally have lower surface energy and larger contact angles, which means that it is difficult for ink and adhesive to fully spread and infiltrate on their surfaces, resulting in poor adhesion to TPE materials.

[0004] In recent years, with the widespread application of TPE materials in wire and cable sheaths, printing has become an indispensable part. At present, there are three main ways to print cables: laser engraving, gravure printing and ink printing. Laser engraving technology can provide high-quality printing effects, but due to its high cost and single color selection, not all manufacturers can accept it. Although gravure printing has a relatively low cost, it may cause minor damage to the cable during operation, leading to stress concentration, which in turn causes cracking problems, and the clarity of the printing is not high. In contrast, ink printing is favored for its convenience, economy and rich color selection, but due to the inertness of the TPE material itself, ink printing is prone to falling off. Although the firmness of the printing can be improved by plasma beam treatment, this further increases the production cost.

[0005] Therefore, how to solve the problem of ink printing not falling off while maintaining the excellent performance of TPE materials is still a major challenge facing the industry. Summary of the invention

[0006] In view of the above problems existing in the prior art, the present invention provides a halogen-free flame-retardant thermoplastic elastomer material that is easy to print with ink, and a preparation method and application thereof.

[0007] One object of the present invention is achieved by the following technical solutions:

[0008] A halogen-free flame-retardant thermoplastic elastomer material that is easy to print with ink. The thermoplastic elastomer material is processed from the following raw materials in parts by weight: 15 to 35 parts of styrene-based thermoplastic elastomer, 15 to 30 parts of polyolefin resin, 10 to 30 parts of polar plasticizer, 5 to 15 parts of polyphenylene ether, 25 to 40 parts of flame retardant, 0.1 to 0.5 parts of antioxidant, 0.5 to 1.5 parts of anti-ultraviolet agent, and 0.5 to 2 parts of processing aid.

[0009] Preferably, the styrene-based thermoplastic elastomer includes one or more of hydrogenated styrene-ethylene-butylene-styrene triblock copolymer (SEBS), hydrogenated styrene-isoprene-styrene triblock copolymer (SEPS), and hydrogenated styrene-ethylene-isoprene-styrene triblock copolymer (SEEPS); the styrene content in the styrene-based thermoplastic elastomer is 40 to 60 wt%.

[0010] More preferably, the styrene-based thermoplastic elastomer is a hydrogenated styrene-ethylene-butylene-styrene triblock copolymer (SEBS) having a styrene content of 50 to 60 wt%.

[0011] Preferably, the polyolefin resin includes one or more of polypropylene, polyethylene, polyethylene elastomer, and polypropylene elastomer.

[0012] Preferably, the polar plasticizer is maleic anhydride grafted polyolefin lubricating oil, the grafting rate of which is 2-10wt%, and the kinematic viscosity at 40°C is 10000-20000 mPa.s.

[0013] Preferably, the polyphenylene ether is polyphenylene ether powder with a particle size of 200-1000 mesh and an intrinsic viscosity of 30-40 ml / g. The intrinsic viscosity is a physical quantity that measures the rheological properties of polymer solutions. It reflects the volume of polymer chains in the solution and is used to describe the influence of the polymer itself on the viscosity of the solution. Generally, the greater the intrinsic viscosity, the greater the extension of the polymer chain in the solution and the higher the molecular weight.

[0014] The present invention adds a polyphenylene ether (PPO) component to a halogen-free flame-retardant thermoplastic elastomer material system, which can improve the rigidity and strength of the material and also play a certain flame retardant role. Since the modulus of polyphenylene ether is relatively high, a more solid network structure can be formed in the composite material. In addition, polyphenylene ether also plays the role of a flame retardant carbonizing agent in the formula, which can form a carbon layer during the combustion process, and this carbon layer can isolate oxygen and reduce heat transfer, thereby inhibiting the spread of flames, thereby improving the flame retardant properties of the material.

[0015] Preferably, the flame retardant is a composite phosphorus-nitrogen flame retardant, which is a compound of diethyl hypophosphite and melamine cyanurate.

[0016] Preferably, the particle size D98 of the diethyl hypophosphite and melamine cyanurate is ≤10 μm, more preferably 1 to 10 μm.

[0017] Preferably, the compounding ratio of diethyl hypophosphite to melamine cyanurate is (0.5-1):1, and more preferably (0.6-0.8):1.

[0018] The present invention introduces a composite phosphorus-nitrogen flame retardant in one step, which can produce a synergistic effect with polyphenylene ether. Both can promote carbonization during the combustion process, so that a protective carbon layer is formed on the surface of the material. Polyphenylene ether can further enhance the stability and continuity of the carbon layer. This synergistic effect can more effectively prevent the further spread of the flame. When the phosphorus-nitrogen flame retardant is present in the system, the synergistic effect combined with polyphenylene ether helps to maintain the structural stability of the material at high temperatures and prevent early degradation.

[0019] Preferably, the antioxidant is a hindered phenol antioxidant, including one or more of antioxidant 1010, antioxidant 1076, antioxidant BHT, antioxidant 168, antioxidant 1098, antioxidant 1790, antioxidant 245, antioxidant 246, antioxidant 3114, and antioxidant 330.

[0020] Preferably, the anti-ultraviolet agent includes one or more of benzophenones, benzotriazoles and hindered amines.

[0021] Preferably, the processing aid is a silicone masterbatch, wherein the molecular weight of the silicone is 1 to 10 million, and the carrier is linear low-density polyethylene (LLDPE).

[0022] The second object of the present invention is achieved by the following technical solutions:

[0023] A method for preparing a halogen-free flame-retardant thermoplastic elastomer material that is easy to print with ink, the preparation method comprising the following steps:

[0024] The polar plasticizer is first heated to 80-120° C. and then mixed evenly with a styrene-based thermoplastic elastomer; then the polar plasticizer is put into a high-speed mixer and mixed evenly with polyolefin resin, polyphenylene ether, flame retardant, antioxidant, anti-ultraviolet agent and processing aid; the mixed material is extruded and granulated to obtain a halogen-free flame-retardant thermoplastic elastomer material that is easy to print with ink.

[0025] Preferably, the mixed material is extruded and granulated in a twin-screw extruder, the screw speed is 300-600 rpm, and the processing temperature is 180-220°C.

[0026] The third object of the present invention is achieved by the following technical solutions:

[0027] The invention discloses an application of an ink-easy printable halogen-free flame-retardant thermoplastic elastomer material in the preparation of a thermoplastic elastomer sheath product.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. The present invention provides a halogen-free flame-retardant thermoplastic elastomer material that is easy to print with ink. Through the selection of multiple raw material components, the thermoplastic elastomer material has excellent ink printing performance and ensures good flame retardancy and mechanical properties. Specifically, a thermoplastic elastomer matrix with a high styrene content and a maleic anhydride grafted polyolefin lubricant are used. The two can synergistically increase the polarity of the thermoplastic elastomer material, thereby increasing the ink printing performance of the material; at the same time, the introduction of a polyphenylene ether component into the system provides the material with excellent rigidity and assists in flame retardancy. When used in combination with a composite phosphorus-nitrogen flame retardant, a protective carbon layer can be formed during the combustion process, and the carbon layer has a high structural stability; in addition, a thermoplastic elastomer with a high styrene content can be more compatible with polyphenylene ether resins, ensuring the overall performance of the material.

[0030] 2. The present invention provides an ink-easy printable halogen-free flame-retardant thermoplastic elastomer material, which uses a thermoplastic elastomer matrix with a high styrene content. The styrene content can reach 40 to 60 wt %. The increase in the styrene content helps to enhance the polarity of the thermoplastic elastomer itself, thereby increasing the affinity between the material and the ink; and the thermoplastic elastomer with a high styrene content has better compatibility with the polyphenylene ether resin, thereby ensuring the overall performance of the material.

[0031] 3. The present invention provides an ink-easy halogen-free flame-retardant thermoplastic elastomer material, which introduces maleic anhydride grafted polyolefin lubricant to further increase the polarity of the thermoplastic elastomer material and enhance the interaction between the material and the ink, thereby enhancing the firmness of the printing, which has an important influence on the adhesion ability of the ink.

[0032] 4. The present invention provides an ink-printable halogen-free flame-retardant thermoplastic elastomer material, which adopts maleic anhydride grafted polyolefin lubricating oil with higher viscosity as a plasticizer. Compared with conventional white oil, the plasticizer has a higher molecular weight, and because it contains maleic anhydride groups, it helps to improve the compatibility between the flame retardant and the TPE substrate; in addition, the addition of the plasticizer will have a synergistic effect with the styrene thermoplastic elastomer and polyphenylene ether in the system, while improving the ink printing performance, the mechanical properties and scratch resistance of the material are also improved to a certain extent. DETAILED DESCRIPTION

[0033] The technical solution of the present invention is further described below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.

[0034] The sources of raw materials and specific parameters used in the following examples and comparative examples are as follows:

[0035] Styrene thermoplastic elastomer:

[0036] SEBS Q5535 is SEBS produced by Zhejiang Zhongli Synthetic Materials Technology Co., Ltd., with a styrene content of 58wt%;

[0037] SEBS 511 is SEBS produced by Yueyang Baling Petrochemical, with a styrene content of 42wt%;

[0038] SEBS 6154 is SEBS produced by TSRC, with a styrene content of 30wt%;

[0039] Polyolefin resin:

[0040] PP 3015 is a copolymer produced by Ningbo Formosa Plastics, with a melt index of 2g / 10min (230℃, 2.16Kg);

[0041] LLDPE 3518CB is a metallocene LLDPE produced by ExxonMobil, USA, with a melt index of 3.4 g / 10 min (190 ° C, 2.16 kg);

[0042] Polar plasticizers:

[0043] LUCANT A5260 and LUCANT A5515 are maleic anhydride grafted polyolefin lubricants produced by Mitsui Chemicals of Japan; the maleic anhydride content of LUCANT A5260 is 2.0wt%, and the kinematic viscosity at 40°C is 10800mPa.s; the maleic anhydride content of LUCANTA5515 is 5.0wt%, and the kinematic viscosity at 40°C is 16000mPa.s.

[0044] Example 1

[0045] The ink-printable halogen-free flame-retardant thermoplastic elastomer material of this embodiment is made from the following raw materials in parts by weight: 25 parts of SEBS (Q5535), 20 parts of PP (3015), 25 parts of maleic anhydride grafted polyolefin lubricant (LUCANT A5260), 12 parts of polyphenylene ether (PPO LXR 035 powder), 12 parts of diethyl aluminum hypophosphite, 18 parts of melamine cyanurate, 0.3 parts of antioxidant 1010, 0.6 parts of UV (329), 0.4 parts of UV (622), and 1.5 parts of silicone masterbatch.

[0046] The method for preparing the above-mentioned halogen-free flame-retardant thermoplastic elastomer material that is easy to print with ink comprises the following steps:

[0047] (1) First, heat the maleic anhydride grafted polyolefin lubricant oil to 100°C, and then fully mix it with SEBS;

[0048] (2) placing the oil-filled styrene thermoplastic elastomer and the remaining components in a high-speed mixer and mixing them uniformly;

[0049] (3) The mixed materials were added into a twin-screw extruder for extrusion granulation. The screw speed was 500 rpm and the processing temperature was 200°C.

[0050] Example 2

[0051] The ink-printable halogen-free flame-retardant thermoplastic elastomer material of this embodiment is made from the following raw materials in parts by weight: 25 parts of SEBS (511), 10 parts of PP (3015), 10 parts of LLDPE (3518), 15 parts of maleic anhydride grafted polyolefin lubricant (LUCANTA5515), 10 parts of polyphenylene ether (PPO LXR 035 powder), 14 parts of diethyl aluminum hypophosphite, 15 parts of melamine cyanurate, 0.3 parts of antioxidant 1010, 0.3 parts of UV (329), 0.4 parts of UV (622), and 1 part of silicone masterbatch.

[0052] The preparation method of the ink-printable halogen-free flame-retardant thermoplastic elastomer material in this embodiment is the same as that in Example 1.

[0053] Example 3

[0054] The ink-printable halogen-free flame-retardant thermoplastic elastomer material of this embodiment is made from the following raw materials in parts by weight: 18 parts of SEBS (Q5535), 10 parts of PP (3015), 20 parts of LLDPE (3518), 25 parts of maleic anhydride grafted polyolefin lubricant (LUCANTA5260), 12 parts of polyphenylene ether (PPO LXR 035 powder), 13 parts of diethyl aluminum hypophosphite, 15 parts of melamine cyanurate, 0.5 parts of antioxidant 1010, 0.3 parts of UV (329), 0.7 parts of UV (622), and 0.5 parts of silicone masterbatch.

[0055] The preparation method of the ink-printable halogen-free flame-retardant thermoplastic elastomer material in this embodiment is the same as that in Example 1.

[0056] Example 4

[0057] The ink-printable halogen-free flame-retardant thermoplastic elastomer material of this embodiment is made from the following raw materials in parts by weight: 30 parts of SEBS (Q5535), 15 parts of PP (3015), 30 parts of maleic anhydride grafted polyolefin lubricant (LUCANT A5515), 13 parts of polyphenylene ether (PPO LXR 035 powder), 10 parts of diethyl aluminum hypophosphite, 16 parts of melamine cyanurate, 0.3 parts of antioxidant 1010, 0.4 parts of UV (329), 0.3 parts of UV (622), and 1.5 parts of silicone masterbatch.

[0058] The preparation method of the ink-printable halogen-free flame-retardant thermoplastic elastomer material in this embodiment is the same as that in Example 1.

[0059] Example 5

[0060] The ink-printable halogen-free flame-retardant thermoplastic elastomer material of this embodiment is made from the following raw materials in parts by weight: 35 parts of SEBS (511), 10 parts of PP (3015), 10 parts of LLDPE (3518), 20 parts of maleic anhydride grafted polyolefin lubricant (LUCANTA5260), 15 parts of polyphenylene ether (PPO LXR 035 powder), 12 parts of diethyl aluminum hypophosphite, 14 parts of melamine cyanurate, 0.4 parts of antioxidant 1010, 0.6 parts of UV (329), 0.9 parts of UV (622), and 2 parts of silicone masterbatch.

[0061] The preparation method of the ink-printable halogen-free flame-retardant thermoplastic elastomer material in this embodiment is the same as that in Example 1.

[0062] Comparative Example 1

[0063] The difference between this comparative example and Example 1 is that the styrene-based thermoplastic elastomer is SEBS 6154 (styrene content is 30 wt%), the plasticizer is white oil (viscosity is 50 mPa.s), and the rest is the same as Example 1.

[0064] The ink-printable halogen-free flame-retardant thermoplastic elastomer material of this comparative example is made from the following raw materials in parts by weight: 25 parts of SEBS (6154), 20 parts of PP (3015), 25 parts of white oil, 12 parts of polyphenylene ether (PPO LXR 035 powder), 12 parts of diethyl aluminum hypophosphite, 18 parts of melamine cyanurate, 0.3 parts of antioxidant 1010, 0.6 parts of UV (329), 0.4 parts of UV (622), and 1.5 parts of silicone masterbatch.

[0065] The preparation method of the thermoplastic elastomer material in this comparative example is the same as that in Example 1.

[0066] Comparative Example 2

[0067] The difference between this comparative example and Example 1 is that the styrene-based thermoplastic elastomer is SEBS 6154 (styrene content is 30 wt%), and the rest is the same as Example 1.

[0068] The ink-printable halogen-free flame-retardant thermoplastic elastomer material of this comparative example is made from the following raw materials in parts by weight: 25 parts of SEBS (6154), 20 parts of PP (3015), 25 parts of maleic anhydride grafted polyolefin lubricant (LUCANT A5260), 12 parts of polyphenylene ether (PPO LXR 035 powder), 12 parts of diethyl aluminum hypophosphite, 18 parts of melamine cyanurate, 0.3 parts of antioxidant 1010, 0.6 parts of UV (329), 0.4 parts of UV (622), and 1.5 parts of silicone masterbatch.

[0069] The preparation method of the thermoplastic elastomer material in this comparative example is the same as that in Example 1.

[0070] Comparative Example 3

[0071] The difference between this comparative example and Example 1 is that white oil (viscosity of 50 mPa.s) is used as the plasticizer, and the rest is the same as Example 1.

[0072] The ink-printable halogen-free flame-retardant thermoplastic elastomer material of this comparative example is made from the following raw materials in parts by weight: 25 parts of SEBS (Q5535), 20 parts of PP (3015), 25 parts of white oil, 12 parts of polyphenylene ether (PPO LXR 035 powder), 12 parts of diethyl aluminum hypophosphite, 18 parts of melamine cyanurate, 0.3 parts of antioxidant 1010, 0.6 parts of UV (329), 0.4 parts of UV (622), and 1.5 parts of silicone masterbatch.

[0073] The preparation method of the thermoplastic elastomer material in this comparative example is the same as that in Example 1.

[0074] Comparative Example 4

[0075] The difference between this comparative example and Example 1 is that no polyphenylene ether component is added, and the rest is the same as Example 1.

[0076] The ink-printable halogen-free flame-retardant thermoplastic elastomer material in this comparative example is made from the following raw materials in parts by weight: 25 parts of SEBS (Q5535), 20 parts of PP (3015), 25 parts of maleic anhydride grafted polyolefin lubricant (LUCANT A5260), 12 parts of diethyl aluminum hypophosphite, 18 parts of melamine cyanurate, 0.3 parts of antioxidant 1010, 0.6 parts of UV (329), 0.4 parts of UV (622), and 1.5 parts of silicone masterbatch.

[0077] The preparation method of the thermoplastic elastomer material in this comparative example is the same as that in Example 1.

[0078] The thermoplastic elastomer materials of the above-mentioned embodiments and comparative examples were tested for Shore A hardness, tensile strength, elongation at break, aging strength retention, aging elongation at break retention, flame retardancy and ink printing fastness. The specific test results are shown in Table 1.

[0079] Among them, the hot air aging strength retention rate (%) was tested under the condition of 136°C×168h; the hot air aging breaking elongation retention rate (%) was tested under the condition of 136°C×168h; the ink printing fastness was tested according to UL 15811690 (the standard requires that the printed text can be read after the felt with a heavy object is rubbed back and forth three times).

[0080] Table 1 Performance test results of examples and comparative examples

[0081]

[0082] As shown in Table 1, it can be seen from Examples 1 to 5 that the halogen-free flame-retardant thermoplastic elastomer material that is easy to print with ink prepared by the present invention has excellent ink resistance and ensures a good flame retardant level. It also has excellent strength and aging properties. The higher the styrene content of the thermoplastic elastomer matrix, the more beneficial it is to the ink fastness.

[0083] Comparative Example 1 is a common halogen-free flame-retardant TPE material, which does not use SEBS with a high styrene content and uses a conventional white oil plasticizer. The resulting material has weak molecular polarity and poor affinity with ink, and cannot pass the UL 15811690 ink printing fastness test; Comparative Example 2 does not use SEBS with a high styrene content, but uses a polar plasticizer LUCANT A5515, compared with comparative example 1, the ink fastness is improved, and the tensile strength is also improved, but the ink fastness is still much lower than that of the embodiment, which further proves that increasing the styrene content of SEBS is beneficial to improving the ink affinity of the TPE material; in comparative example 3, SEBS with a high styrene content is used in combination with conventional commercially available white oil. Although the polarity of the material is improved and can meet the ink printing fastness test, the number is significantly lower than that of the embodiment, indicating that compared with SEBS with a high styrene content, the coordinated use of polar plasticizers can better improve the affinity of the material with the ink, thereby improving the ink printing fastness of the material; in comparative example 4, no polyphenylene ether component is added to provide the material with excellent rigidity, resulting in a decrease in material strength. In addition, polyphenylene ether also plays the role of a flame retardant carbonizing agent in the formula. Without adding it, the flame retardant performance of the material decreases and the VW-1 grade cannot be reached.

[0084] The various aspects, embodiments, and features of the present invention should be considered to be illustrative in all aspects and not limiting of the present invention, the scope of which is defined solely by the claims. Other embodiments, modifications, and uses will be apparent to those skilled in the art without departing from the spirit and scope of the claimed invention.

[0085] In the preparation method of the present invention, the order of each step is not limited to the order listed. For those skilled in the art, without creative work, the order of each step is also within the protection scope of the present invention. In addition, two or more steps or actions can be performed simultaneously.

[0086] Finally, it should be noted that the specific embodiments described herein are merely examples of the present invention, and are not intended to limit the implementation methods of the present invention. A person skilled in the art of the present invention may make various modifications or supplements to the specific embodiments described, or replace them in a similar manner. It is not necessary and impossible to provide all examples of all implementation methods here. However, these obvious changes or modifications derived from the essential spirit of the present invention still fall within the scope of protection of the present invention, and interpreting them as any additional limitation is contrary to the spirit of the present invention.

Claims

1. A halogen-free flame-retardant thermoplastic elastomer material that is easy to print with ink, characterized in that: The thermoplastic elastomer material is processed from the following raw materials in parts by weight: 15 to 35 parts of styrene-based thermoplastic elastomer, 15 to 30 parts of polyolefin resin, 10 to 30 parts of polar plasticizer, 5 to 15 parts of polyphenylene ether, 25 to 40 parts of flame retardant, 0.1 to 0.5 parts of antioxidant, 0.5 to 1.5 parts of anti-ultraviolet agent and 0.5 to 2 parts of processing aid.

2. The ink-printable halogen-free flame-retardant thermoplastic elastomer material according to claim 1, characterized in that: The thermoplastic elastomer is a styrene-based thermoplastic elastomer, including one or more of hydrogenated styrene-ethylene-butylene-styrene triblock copolymer, hydrogenated styrene-isoprene-styrene triblock copolymer, and hydrogenated styrene-ethylene-isoprene-styrene triblock copolymer; the styrene content in the styrene-based thermoplastic elastomer is 40-60wt%.

3. The ink-printable halogen-free flame-retardant thermoplastic elastomer material according to claim 1, characterized in that: The thermoplastic elastomer is a hydrogenated styrene-ethylene-butylene-styrene triblock copolymer, and the styrene content is 50-60wt%.

4. The ink-printable halogen-free flame-retardant thermoplastic elastomer material according to claim 1, characterized in that: The polar plasticizer is maleic anhydride grafted polyolefin lubricating oil, the grafting rate is 2-10wt%, and the kinematic viscosity at 40 DEG C is 10000-20000 mPa.s.

5. The ink-printable halogen-free flame-retardant thermoplastic elastomer material according to claim 1, characterized in that: The polyolefin resin includes one or more of polypropylene, polyethylene, polyethylene elastomer, and polypropylene elastomer.

6. The ink-printable halogen-free flame-retardant thermoplastic elastomer material according to claim 1, characterized in that: The polyphenylene ether is polyphenylene ether powder with a particle size of 200-1000 meshes and an intrinsic viscosity of 30-40 ml / g.

7. The ink-printable halogen-free flame-retardant thermoplastic elastomer material according to claim 1, characterized in that: The flame retardant is a composite phosphorus-nitrogen flame retardant, which is a compound of diethyl hypophosphite and melamine cyanurate; The particle size D98 of the diethyl hypophosphite and melamine cyanurate is ≤10 μm; The compounding ratio of the diethyl hypophosphite and melamine cyanurate is (0.5-1):

1.

8. The ink-printable halogen-free flame-retardant thermoplastic elastomer material according to claim 1, characterized in that: The antioxidant is a hindered phenol antioxidant, including one or more of antioxidant 1010, antioxidant 1076, antioxidant BHT, antioxidant 168, antioxidant 1098, antioxidant 1790, antioxidant 245, antioxidant 246, antioxidant 3114, and antioxidant 330; And / or, the anti-ultraviolet agent includes one or more of benzophenone, benzotriazole and hindered amine; And / or, the processing aid is a silicone masterbatch, wherein the molecular weight of the silicone is 1 to 10 million, and the carrier is a linear low-density polyethylene.

9. A method for preparing an ink-printable halogen-free flame-retardant thermoplastic elastomer material as claimed in any one of claims 1 to 8, characterized in that: The preparation method comprises the following steps: The polar plasticizer is first heated to 80-120° C. and then mixed evenly with the thermoplastic elastomer; then the polar plasticizer is put into a high-speed mixer and mixed evenly with the polyolefin resin, polyphenylene ether, flame retardant, antioxidant, anti-ultraviolet agent and processing aid; the mixed materials are extruded and granulated to obtain a halogen-free flame-retardant thermoplastic elastomer material that is easy to print with ink.

10. Use of the ink-printable halogen-free flame-retardant thermoplastic elastomer material as claimed in any one of claims 1 to 8 in the preparation of thermoplastic elastomer sheath products.

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