A high-tensile-strength foaming material, its preparation method and application

Abstract

The present invention belongs to the technical field of foaming materials, and specifically discloses a high-tensile-strength foaming material, a preparation method thereof, and an application thereof. In the present invention, a polyether block amide, ethylene vinyl acetate, a compatibilizer (the compatibilizer includes ethylene vinyl acetate grafted maleic anhydride and hydrogenated styrene-butadiene-styrene grafted maleic anhydride), and an antioxidant are sequentially subjected to internal mixing, drying, and pressing to obtain the high-tensile-strength foaming material. The solution of the present invention can reduce the domain size of the polyether block amide and ethylene vinyl acetate, thereby improving the mechanical properties. The disclosed high-tensile-strength foaming material of the present invention has the characteristics of simple processing technology, low production cost, and more excellent performance, and has a broader application scenario.

Description

Technical Field

[0001] The present invention relates to the technical field of foaming materials, and particularly relates to a high-tensile-strength foaming material, a preparation method thereof, and an application thereof. Background Art

[0002] Foaming materials include polyamide (PA)-based foaming materials. Polyamide-based foaming materials belong to polyether-polyamide alternating block copolymers (Polyether-b-amide, PEBA), also known as nylon elastomers. The hard segments of this copolymer are aliphatic polyamides with strong crystallinity and high melting points, and the soft segments are polyethers, enabling it to possess not only various advantages of polyamides, such as good processability, high temperature resistance, good solvent resistance, creep resistance, good dimensional stability, wear resistance, etc.; but also various advantages of polyethers, such as good low-temperature toughness, impact resistance, and resilience. Polyamide includes long-chain polyamide (LCPA). Long-chain polyamide is a polyamide in which the number of methylene repeating units between two adjacent amide groups is greater than 10. LCPA not only has good toughness and dimensional stability but also has advantages such as fatigue resistance and low processing temperature. Therefore, polyamide elastomer (LCPAE) using LCPA as the hard segment enables the polyamide elastomer to have the dual advantages of long-chain polyamide and elastomer.

[0003] When nylon elastomer is used alone as a foaming material, the price is relatively expensive, and its mechanical properties, especially the toughness at low temperatures, are insufficient. Currently, most on the market use nylon elastomer to blend with other elastomers to prepare foaming materials, which can reduce costs and also make up for the lack of toughness at low temperatures. However, due to the low mixing entropy of polymers themselves, most polymers are thermodynamically incompatible, and the immiscibility of different polar polymers leads to phase separation, resulting in the coarsening of the polymer morphology, the formation of large dispersed domains and weak interfaces in the continuous matrix, and ultimately the deterioration of the mechanical properties due to the inherent tendency of the polymer.

[0004] Chinese invention patent CN108250734B discloses a Pebax / TPU blend foaming material. Its formula by weight is as follows: the total parts of Pebax and TPU are 100 parts, and the weight ratio of Pebax to TPU is 10:90 - 90:10. The preparation method is to blend Pebax and TPU and then granulate. After drying the particles, put them into a high-pressure reaction kettle filled with an appropriate amount of water, start stirring, introduce a physical foaming agent, heat up and pressurize it to reach the supercritical state. When the supercritical fluid reaches saturation in the polymer particles, open the valve and rapidly depressurize to obtain microcellular foamed beads. However, during the preparation process of this foaming material, the physical crosslinking points between the strong polar groups in the TPU molecules are reduced, resulting in serious shrinkage of the foamed beads and a decrease in the resilience and tensile strength of the foaming material.

[0005] Chinese Patent Application CN108047702A discloses a thermoplastic elastomer and its foamed material. A new thermoplastic elastomer material is obtained by blending Pebax with one or more of POE and OBC and then crosslinking. After that, this material is supercritically foamed to obtain the foamed material of this elastomer. However, there are problems in the foamed material such as two-phase or multi-phase blending, insufficient mixing, phase separation at the micron scale, resulting in certain problems in the interfacial bonding between particles and shrinkage.

[0006] Patent No. CN109111720A discloses an ultra-light and high-rebound ETPU composite shock-absorbing midsole material for shoes and its molding method. The ultra-light and high-rebound ETPU composite shock-absorbing midsole material for shoes is prepared by granulating, foaming and molding processes from a TPU composite material. The TPU composite material includes, by mass: 60-95 parts of TPU resin, 0-20 parts of nylon elastomer resin, 0-20 parts of polyester elastomer resin, 1-5 parts of polyester resin, 0.5-2 parts of nucleating agent, 0.1-0.5 parts of antioxidant, 0.1-1 part of stearic acid, and 0.1-0.5 parts of cell stabilizer. Among them, the TPU resin is a mixture composed of a TPU resin with a Shore hardness of 90-95A and a TPU resin with a Shore hardness of 50-60A. The proportion of the TPU resin with a hardness of 90-95A is 80%-95%, and the proportion of the TPU resin with a hardness of 50-60A is 5%-20%. However, this ultra-light and high-rebound ETPU composite shock-absorbing midsole material for shoes uses a variety of materials in blending, and there are also problems such as multi-phase separation, interfacial bonding and shrinkage.

[0007] Patent No. CN111117215A discloses a thermoplastic elastomer foamed shoe material and its preparation method, which uses two or more nylon elastomers in blending and is composed of the following raw materials by mass: 100 parts of modified polyamide elastomer, 0.1-0.5 parts of antioxidant, and 0-10 parts of nucleating agent. The modified polyamide elastomer includes at least two polyamide elastomers, and the foamed material of this elastomer is prepared by supercritical fluid foaming technology. Although the problem of uneven multi-phase mixing is avoided, only nylon elastomers are used, which are expensive and the mechanical properties have not been truly improved.

[0008] Therefore, how to provide a high-tensile-strength foamed material, its preparation method and application, reduce the preparation cost of the foamed material, and improve its mechanical properties are technical problems urgently to be solved in this field. Summary of the Invention

[0009] In view of this, the present invention provides a high-tensile-strength foaming material, its preparation method and application. The present invention uses ethylene vinyl acetate grafted maleic anhydride (EVA-g-MAH) and hydrogenated styrene-butadiene-styrene grafted maleic anhydride (SEBS-g-MAH) as co-compatibilizers, and blends polyether block amide and ethylene vinyl acetate through a kneader, solving the problems of poor mechanical properties and high cost of the foaming material.

[0010] In order to achieve the above object, the present invention adopts the following technical solutions:

[0011] A high-tensile-strength foaming material is prepared from raw materials comprising the following parts by mass: 20-80 parts of polyether block amide, 10-75 parts of ethylene vinyl acetate, 1-10 parts of compatibilizer, and 0.1-0.5 parts of antioxidant;

[0012] The compatibilizer includes ethylene vinyl acetate grafted maleic anhydride and hydrogenated styrene-butadiene-styrene grafted maleic anhydride.

[0013] Preferably, the mass ratio of ethylene vinyl acetate grafted maleic anhydride to hydrogenated styrene-butadiene-styrene grafted maleic anhydride is 1-10:1-10.

[0014] Preferably, the polyether block amide is a block copolymer with alternating long carbon chain soft segments and hard segments.

[0015] Preferably, the soft segment in the polyether block amide includes one or more of polytetramethylene ether, polyethylene oxide, polytetrahydrofuran, polyethylene glycol, polypropylene glycol, copolyether diol, polyether diamine, polysiloxane polyolefin; the hard segment includes one or more of PA11, PA12, PA1012.

[0016] Preferably, the antioxidant includes one or more of antioxidant 1010, antioxidant 168, antioxidant 1076, antioxidant 1098.

[0017] Another object of the present invention is to provide a preparation method of a high-tensile-strength foaming material, comprising the following steps:

[0018] Knead, dry, and press polyether block amide, ethylene vinyl acetate, compatibilizer, and antioxidant in sequence to obtain a high-tensile-strength foaming material.

[0019] Preferably, the temperature of the kneading is 180-200 °C, the time of the kneading is 10-12 min, and the rotor speed during the kneading process is 50-60 rpm.

[0020] Preferably, the temperature of the pressing is 200-220 °C, the pressure during the pressing process ≥ 10 MPa, the pressing time is 8-10 min, and exhaust air 3-4 times during the pressing period.

[0021] A further object of the present invention is to provide an application of the tensile high-strength foamed material prepared by the said preparation method in the field of sports protection pads or sports shoe soles.

[0022] As can be seen from the above technical solutions, compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The present invention uses ethylene vinyl acetate grafted maleic anhydride (EVA-g-MAH) and hydrogenated styrene-butadiene-styrene grafted maleic anhydride (SEBS-g-MAH) as co-compatibilizers. Both compatibilizers are grafted with maleic anhydride, and this group can react with the hydroxyl group (-OH) or carboxyl group (-COOH) in the PA phase of polyether block amide (PEBA). At the same time, EVA-g-MAH and SEBS-g-MAH both have good compatibility with ethylene vinyl acetate (EVA). The addition of the compatibilizer enhances the interaction between the two matrices, reduces the interfacial tension and the domain size; secondly, when the two compatibilizers are added simultaneously, the agglomeration between them can be reduced, further enhancing the binding force between the two phases of the matrix and also reducing the interfacial tension, thereby further reducing the phase size of the dispersed phase and making the size distribution more uniform. The present invention uses it as a compatibilizer for PEBA and EVA, greatly improving the mechanical properties of the PEBA / EVA blend.

[0024] 2. The method disclosed in the present invention is simple and easy to implement, and while reducing costs, a PEBA / EVA blend material with excellent performance is obtained. Detailed Embodiments

[0025] The present invention provides a tensile high-strength foamed material, which is prepared from raw materials comprising the following parts by mass: 20-80 parts of polyether block amide, 10-75 parts of ethylene vinyl acetate, 1-10 parts of compatibilizer, 0.1-0.5 part of antioxidant; preferably 30-70 parts of polyether block amide, 20-70 parts of ethylene vinyl acetate, 3-8 parts of compatibilizer, 0.15-0.45 part of antioxidant; more preferably 40-60 parts of polyether block amide, 40-60 parts of ethylene vinyl acetate, 4-6 parts of compatibilizer, 0.2-0.4 part of antioxidant; still more preferably 50 parts of polyether block amide, 50 parts of ethylene vinyl acetate, 5 parts of compatibilizer, 0.3 part of antioxidant.

[0026] The compatibilizer includes ethylene vinyl acetate grafted maleic anhydride and hydrogenated styrene-butadiene-styrene grafted maleic anhydride.

[0027] In the present invention, the mass ratio of ethylene vinyl acetate grafted maleic anhydride to hydrogenated styrene-butadiene-styrene grafted maleic anhydride is 1 to 10:1 to 10; preferably 2 to 8:2 to 8, more preferably 4 to 6:4 to 6, and even more preferably 5:5.

[0028] In the present invention, the polyether block amide is a block copolymer with alternating long carbon chain soft segments and hard segments.

[0029] In the present invention, the soft segments in the polyether block amide include one or more of polytetramethylene ether, polyethylene oxide, polytetrahydrofuran, polyethylene glycol, polypropylene glycol, copolyether diol, polyether diamine, and polyorganosiloxane polyolefin; the hard segments include one or more of PA11, PA12, and PA1012.

[0030] In the present invention, the melting point of the soft segment in the polyether block amide is 70 to 80 °C, and the crystallization temperature is 40 to 50 °C; the melting point of the hard segment is 180 to 190 °C, and the crystallization temperature is 120 to 140 °C.

[0031] In the present invention, the antioxidant includes one or more of antioxidant 1010, antioxidant 168, antioxidant 1076, and antioxidant 1098.

[0032] The present invention also provides a method for preparing a high tensile strength foaming material, which includes the following steps:

[0033] Mix the polyether block amide, ethylene vinyl acetate, compatibilizer, and antioxidant in sequence by internal mixing, drying, and pressing to obtain the high tensile strength foaming material.

[0034] In the present invention, before the polyether block amide is internally mixed with ethylene vinyl acetate, compatibilizer, and antioxidant, the polyether block amide needs to be pre-internally mixed first. The temperature of the internal mixing is 180 to 200 °C, specifically it can be 182 °C, 185 °C, 188 °C, 190 °C, 192 °C, 195 °C, 198 °C; the time of the internal mixing is 3 to 5 minutes, specifically it can be 3.5 minutes, 4 minutes, 4.5 minutes; the rotor speed during the internal mixing process is 50 to 60 rpm, specifically it can be 52 rpm, 54 rpm, 55 rpm, 56 rpm, 58 rpm.

[0035] In the present invention, the temperature of the internal mixing is 180 to 200 °C, specifically it can be 182 °C, 185 °C, 188 °C, 190 °C, 192 °C, 195 °C, 198 °C; the time of the internal mixing is 10 to 12 minutes, specifically it can be 10.5 minutes, 11 minutes, 11.5 minutes; the rotor speed during the internal mixing process is 50 to 60 rpm, specifically it can be 52 rpm, 54 rpm, 55 rpm, 56 rpm, 58 rpm.

[0036] In the present invention, the temperature of the pressing plate is 200 - 220°C, specifically it can be 205°C, 210°C, 215°C; the pressure during the pressing process is ≥10 MPa, specifically it can be 15 MPa, 20 MPa, 30 MPa, 50 MPa, 100 MPa; the pressing time is 8 - 10 min, specifically it can be 8.5 min, 9 min, 9.5 min; exhaust gas is discharged 3 - 4 times during the pressing.

[0037] In the present invention, before pressing, a preheating step is further included. The preheating temperature is the same as the pressing temperature, and the preheating time is 3 - 5 min, specifically it can be 3.5 min, 4 min, 4.5 min.

[0038] In the present invention, discharging gas 3 - 4 times is beneficial for the foaming material to obtain more excellent properties. The purpose of discharging gas is to reduce bubbles and reduce errors caused by human factors.

[0039] The present invention also provides an application of the high tensile strength foaming material prepared by the said preparation method in the fields of sports protection pads or sports shoe soles, specifically it can be used for high-grade sports goods, such as skateboards, hockey, joint support pads, laces, and the soles of sports shoes, etc.

[0040] Next, the technical solutions in the embodiments of the present invention will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0041] Example 1

[0042] Before blending, all raw materials need to be dried in a vacuum oven at 80°C for 12 h. By mass fraction, 80 parts of polyether block amide (the soft segment is polytetramethylene ether and the hard segment is PA11), 15 parts of ethylene vinyl acetate, 2.5 parts of ethylene vinyl acetate grafted maleic anhydride, 2.5 parts of hydrogenated styrene - butadiene - styrene grafted maleic anhydride, and 0.5 part of antioxidant 1010 are weighed. The temperature of the internal mixer is set at 200°C and the rotation speed is 60 rpm. First, the polyether block amide is added to the internal mixer for blending for 3 min, then ethylene vinyl acetate, ethylene vinyl acetate grafted maleic anhydride, hydrogenated styrene - butadiene - styrene grafted maleic anhydride, and antioxidant 1010 are added, and blending is carried out again for 10 min.

[0043] Before pressing the plate, the materials need to be dried in a vacuum oven at 80 °C for 12 h. The temperature of the plate pressing is 220 °C and the pressure is 10 MPa. First, preheat for 3 min. After preheating, perform plate pressing. Control the total plate pressing time to be 10 min. During this period, exhaust gas once every 3 min. Finally, cool with cooling water for 1 min. The obtained sample is cut into dumbbell-shaped specimens for mechanical property testing.

[0044] Example 2

[0045] Before blending, all raw materials need to be dried in a vacuum oven at 80 °C for 12 h. By mass fraction, weigh 80 parts of polyether block amide (soft segment is polytetrahydrofuran and hard segment is PA12), 12 parts of ethylene vinyl acetate, 4 parts of maleic anhydride grafted ethylene vinyl acetate, 4 parts of maleic anhydride grafted hydrogenated styrene-butadiene-styrene, and 0.2 part of antioxidant 1076. Set the temperature of the internal mixer to 200 °C and the rotation speed to 55 rpm. First, add the polyether block amide to the internal mixer and blend for 3 min, then add ethylene vinyl acetate, maleic anhydride grafted ethylene vinyl acetate, maleic anhydride grafted hydrogenated styrene-butadiene-styrene, and antioxidant, and blend again for 10 min.

[0046] Before pressing the plate, the materials need to be dried in a vacuum oven at 80 °C for 12 h. The temperature of the plate pressing is 200 °C and the pressure is 15 MPa. First, preheat for 5 min. After preheating, perform plate pressing. Control the total plate pressing time to be 10 min. During this period, exhaust gas once every 2.2 min. Finally, cool with cooling water for 1 min. The obtained sample is cut into dumbbell-shaped specimens for mechanical property testing.

[0047] Example 3

[0048] Before blending, all raw materials need to be dried in a vacuum oven at 80 °C for 12 h. By mass fraction, weigh 80 parts of polyether block amide (soft segment is polyethylene oxide and hard segment is PA11), 16 parts of ethylene vinyl acetate, 2 parts of maleic anhydride grafted ethylene vinyl acetate, 2 parts of maleic anhydride grafted hydrogenated styrene-butadiene-styrene, and 0.3 part of antioxidant 1098. Set the temperature of the internal mixer to 190 °C and the rotation speed to 50 rpm. First, add the polyether block amide to the internal mixer and blend for 5 min, then add ethylene vinyl acetate, maleic anhydride grafted ethylene vinyl acetate, maleic anhydride grafted hydrogenated styrene-butadiene-styrene, and antioxidant, and blend again for 10 min.

[0049] Before pressing the plate, the material needs to be dried in a vacuum oven at 80 °C for 12 h. The temperature of the plate pressing is 210 °C and the pressure is 10 MPa. First, preheat for 3 min. After preheating, perform plate pressing, control the total plate pressing time to be 10 min, perform exhaust operation every 3 min during this period, and finally cool with cooling water for 1 min. The obtained sample is cut into dumbbell-shaped specimens for mechanical property testing.

[0050] Example 4

[0051] By mass fraction, weigh 60 parts of polyether block amide, 35 parts of ethylene vinyl acetate, 2.5 parts of maleic anhydride grafted ethylene vinyl acetate, 2.5 parts of maleic anhydride grafted hydrogenated styrene-butadiene-styrene, and 0.5 part of antioxidant. Except for this, the operations are the same as in Example 1.

[0052] Example 5

[0053] By mass fraction, weigh 50 parts of polyether block amide, 45 parts of ethylene vinyl acetate, 2.5 parts of maleic anhydride grafted ethylene vinyl acetate, 2.5 parts of maleic anhydride grafted hydrogenated styrene-butadiene-styrene, and 0.5 part of antioxidant. Except for this, the operations are the same as in Example 1.

[0054] Example 6

[0055] By mass fraction, weigh 40 parts of polyether block amide, 55 parts of ethylene vinyl acetate, 2.5 parts of maleic anhydride grafted ethylene vinyl acetate, 2.5 parts of maleic anhydride grafted hydrogenated styrene-butadiene-styrene, and 0.5 part of antioxidant. Except for this, the operations are the same as in Example 1.

[0056] Example 7

[0057] By mass fraction, weigh 30 parts of polyether block amide, 65 parts of ethylene vinyl acetate, 2.5 parts of maleic anhydride grafted ethylene vinyl acetate, 2.5 parts of maleic anhydride grafted hydrogenated styrene-butadiene-styrene, and 0.5 part of antioxidant. Except for this, the operations are the same as in Example 1.

[0058] Example 8

[0059] By mass fraction, weigh 20 parts of polyether block amide, 75 parts of ethylene vinyl acetate, 2.5 parts of maleic anhydride grafted ethylene vinyl acetate, 2.5 parts of maleic anhydride grafted hydrogenated styrene-butadiene-styrene, and 0.5 part of antioxidant. Except for this, the operations are the same as in Example 1.

[0060] Comparative Example 1

[0061] The difference between this comparative example and Example 1 is only that 5 parts of hydrogenated styrene-butadiene-styrene grafted maleic anhydride are added, and ethylene vinyl acetate grafted maleic anhydride is not added.

[0062] Comparative Example 2

[0063] The difference between this comparative example and Example 1 is only that 5 parts of ethylene vinyl acetate grafted maleic anhydride are added, and hydrogenated styrene-butadiene-styrene grafted maleic anhydride is not added.

[0064] Experimental Example 1

[0065] 1. Mechanical properties

[0066] The PEBA / EVA blend was pressed into a film with a thickness of 0.25 mm, and then cut into dumbbell-shaped specimens with dimensions of 50×4×0.25 mm. 3 . The mechanical property tests were carried out on a small tensile testing machine of model E42.503 at a tensile rate of 10 mm / min. Each group of samples was measured at least five times and the average value was taken as the result, in accordance with the national standard GB-T 1040.3.

[0067] Table 1 Test results of mechanical properties

[0068]

[0069] Table 1 shows the values of tensile strength, elongation at break, and Young's modulus. It can be seen from Examples 1 to 8 and Comparative Examples 1 to 2 that adding the two compatibilizers simultaneously can more effectively improve the mechanical properties of PEBA / EVA.

[0070] 2. Differential scanning calorimeter

[0071] Under a nitrogen atmosphere, the crystallization temperature, melting temperature, and melting enthalpy (T C , T m , ΔH m ) were measured using a DSC (Discovery DSC25, TA) calibrated with indium metal.

[0072] The test procedure was as follows: 5 - 10 mg of the sample was placed in an aluminum pan, heated to 220°C at a rate of 30°C / min, held isothermally for 3 min, then cooled to 20°C at a rate of 10°C / min, held for 1 min, and finally heated to 220°C at a rate of 10°C / min. The test results are shown in Table 2.

[0073] Table 2 Test results of differential scanning calorimeter

[0074]

[0075] The subscripts 1 and 2 represent the parameters of EVA and PEBA respectively.

[0076] Table 2 shows that as the EVA content increases, T c1 gradually shifts towards lower temperatures, and T c2 shifts towards higher temperatures. T m changes little, indicating that with the addition of EVA, the heterogeneous nucleation effect leads to an accelerated crystallization rate of PEBA, but the crystallization rate of EVA itself decreases. When a compatibilizer is further added, due to the compatibilization effect, T c2 shifts towards lower temperatures, but has little effect on the melting points of the two components. The enthalpy of fusion (ΔH m ) can indirectly reflect the change in crystallinity. With the addition of EVA, the segmental motion of the PEBA chains is restricted, resulting in a decrease in crystallinity. Moreover, as the EVA content increases, the degree of restriction of the PEBA chain segment motion increases, leading to a further decrease in crystallinity. After adding the compatibilizer, the crystallinity increases to a certain extent due to the compatibilization effect. Generally speaking, the mass fraction and type of the added compatibilizer have little effect on the thermodynamic parameters of PEBA / EVA.

[0077] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. For the same or similar parts among the embodiments, reference can be made to each other.

[0078] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A high-tensile strength foaming material, characterized in that, It is prepared from the following raw materials in parts by mass: 20 - 80 parts of polyether block amide, 10 - 75 parts of ethylene vinyl acetate, 1 - 10 parts of compatibilizer, and 0.1 - 0.5 parts of antioxidant; The compatibilizer includes ethylene vinyl acetate grafted maleic anhydride and hydrogenated styrene - butadiene - styrene grafted maleic anhydride; The mass ratio of the ethylene vinyl acetate grafted maleic anhydride to the hydrogenated styrene - butadiene - styrene grafted maleic anhydride is 1:

1.

2. The tensile high-strength foaming material according to claim 1, wherein The polyether block amide is a block copolymer with alternating long carbon chain soft segments and hard segments.

3. A tensile high-strength foaming material according to any one of claims 1 to 2, characterized in that, The soft segment in the polyether block amide includes one or more of polytetramethylene ether, polyethylene oxide, polytetrahydrofuran, polyethylene glycol, polypropylene glycol, copolymerized polyether diol, polyether diamine, polyorganosiloxane polyolefin; the hard segment includes one or more of PA11, PA12, PA1012.

4. The tensile high-strength foaming material according to claim 3, wherein The antioxidant includes one or more of antioxidant 1010, antioxidant 168, antioxidant 1076, antioxidant 1098.

5. The preparation method of a high-tensile strength foaming material according to any one of claims 1 to 4, characterized in that, It includes the following steps: The polyether block amide, ethylene vinyl acetate, compatibilizer, and antioxidant are sequentially subjected to internal mixing, drying, and pressing to obtain a high - tensile strength foaming material.

6. The preparation method of a high-tensile strength foaming material according to claim 5, characterized in that, The temperature of the internal mixing is 180 - 200 °C, the time of the internal mixing is 10 - 12 min, and the rotor speed during the internal mixing is 50 - 60 rpm.

7. The preparation method of a high tensile strength foaming material according to claim 6, characterized in that, The temperature of the pressing is 200 - 220 °C, the pressure during the pressing process is ≥10 MPa, the pressing time is 8 - 10 min, and the air is exhausted 3 - 4 times during the pressing.

8. Application of the high - tensile strength foaming material prepared by the preparation method according to any one of claims 5 - 7 in the field of sports protection pads or sports shoe soles.

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