High-strength, high-toughness and high-impact absorbing SEBS plastic foamed elastomer and preparation method thereof

Abstract

The application discloses a high-strength high-toughness high-impact-absorption SEBS plastic foaming elastomer and a preparation method thereof, and relates to the technical field of plastic tracks. The components are as follows: 100 parts of hydrogenated styrene-ethylene / butylene-styrene copolymer; 100-150 parts of naphthenic oil; 0.5-1 part of 2,5-dimethyl-2,5-bis(tert-butyl peroxy) hexane; 1-2 parts of trimethylolpropane triacrylate; 30 parts of light calcium powder; 3-5 parts of physically expanded microspheres; 20-30 parts of POE; 0.5 parts of multi-element hindered phenolic antioxidant 1010; 0.3 parts of phosphite antioxidant 168; 0.5 parts of light stabilizer 2020; and 0.3 parts of ultraviolet absorber UV326. The gel content of the high-strength high-toughness high-impact-absorption SEBS plastic foaming elastomer prepared by the application is between 9% and 17.9%, and the SEBS plastic foaming elastomer has good impact absorption and toughness and excellent mechanical properties.

Description

Technical Field

[0001] This invention relates to the field of plastic running track technology, specifically to a high-strength, high-toughness, and high-impact-absorbing SEBS plastic foam elastomer and its preparation method. Background Technology

[0002] Precast synthetic running track rolls have gradually become a key paving material for athletic fields and public sports venues due to their advantages such as uniform quality, environmental friendliness, and convenient construction. Among them, hydrogenated styrene-ethylene / butene-styrene copolymer (SEBS) has excellent hydrolysis resistance and acid and alkali resistance due to its saturated carbon-carbon backbone structure. It has good long-term applicability in places with variable climates, heavy industrial pollution, or frequent cleaning (such as outdoor athletic fields, school playgrounds, and coastal areas), making it an important choice for precast synthetic running track rolls.

[0003] High-strength, high-toughness, and high-impact-absorbing SEBS plastic foam elastomers can meet the stringent requirements of professional sports venues and high-intensity use scenarios for track shock absorption, elastic recovery, and durable weather resistance. However, existing SEBS plastic foam elastomers have the following technical bottlenecks: (1) The improvement of strength, toughness, and impact absorption performance often comes at the expense of each other. For example, improving the hardness and strength of plastic often comes with a loss of elasticity and impact-absorbing performance, making it difficult to achieve a synergistic improvement of "strength-toughness-buffering"; (2) Weather-resistant additives have insufficient compatibility with the SEBS matrix, are prone to migration and precipitation, resulting in weak long-term weather resistance; (3) The interface between the SEBS matrix and microbubbles is prone to become a stress concentration source, which can cause crack propagation under repeated compression loads, damaging the tensile toughness and elastic recovery of the plastic.

[0004] Therefore, how to coordinate SEBS matrix, microbubbles, and weather-resistant additives to develop a SEBS plastic foam elastomer that has high strength, high toughness, high impact absorption performance, and can maintain stable weather resistance over a long period of time has become a key technical challenge to improve the overall performance of prefabricated plastic running tracks and broaden their application fields. Summary of the Invention

[0005] One of the objectives of this invention is to provide a high-strength, high-toughness, and high-impact-absorbing SEBS plastic foam elastomer with excellent weather resistance, good toughness, and mechanical properties.

[0006] The second objective of this invention is to provide a method for preparing the above-mentioned SEBS plastic foam elastomer, which has a simple process and low production cost.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: On one hand, the present invention provides a high-strength, high-toughness, and high-impact-absorbing SEBS plastic foam elastomer, which is made of the following components in parts by weight: Preferably, the hydrogenated styrene-ethylene / butene-styrene copolymer has a star-shaped chain structure.

[0008] Preferably, the POE has a Shore hardness of 50-60 and a melt flow index of 5-13 g / 10 min.

[0009] Preferably, the particle size of the physically expanded microspheres is 25.7 ± 2.6 μm.

[0010] Preferably, the naphthenic oil is a saturated naphthenic oil with a kinematic viscosity of 80-100 mmHg at 40°C. 2 / s.

[0011] Preferably, the particle size of the light calcium powder is 4000 mesh-8000 mesh.

[0012] On the other hand, the present invention provides a method for preparing the above-mentioned high-strength, high-toughness, and high-impact-absorbing SEBS plastic foam elastomer, comprising the following steps: (1) Weigh out POE, multi-functional hindered phenolic antioxidant 1010, phosphite antioxidant 168, light stabilizer 2020 and ultraviolet absorber UV326 according to the ratio, mix them at high speed for 10 min, and extrude and granulate them with a single screw extruder to obtain weather-resistant additive pre-coated granules. (2) Weigh SEBS and naphthenic oil according to the ratio, add them to a twin-screw extruder, mix at high speed for 5 min, and mature for 10 min. Weigh and directly add 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane and trimethylolpropane triacrylate according to the ratio, and mix at high speed for 10 min. Weigh and directly add light calcium powder according to the ratio, mix at high speed for 10 min, and feed it into the main feed port. Weigh the physically expanded microspheres according to the ratio, and mix them with the above weather-resistant additive pre-coated granules at high speed for 5 min, and feed them into the second feed port. At this time, the SEBS gel content is between 3±0.5%, and it is extruded and formed by twin-screw extruder.

[0013] Preferably, in step (1), the temperatures of each working section of the single screw extruder are set to 135°C, 140°C, 150°C, 150°C, and 145°C, respectively, the die head temperature is 140°C, and the screw speed is 100 rpm.

[0014] Preferably, in step (2), the temperatures of each working section of the twin-screw extruder are set to 170°C, 175°C, 185°C, 195°C, 210°C, 210°C, 220°C, 220°C, and 225°C, respectively, the die head temperature is 220°C, and the screw speed is 200 rpm.

[0015] Preferably, in steps (1) and (2), the high-speed stirring speed is 450 rpm. 10 revolutions per minute.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The SEBS plastic foam elastomer prepared by the present invention is composed of cross-linked SEBS and physically expanded microspheres. Cross-linked SEBS is used as the matrix, and independent microbubbles are distributed in the SEBS matrix as the dispersed phase. During the SEBS cross-linking extrusion process, when its gel content is between 3±0.5%, POE and physically expanded microspheres are added to achieve the synergistic effect of SEBS cross-linking reaction and physical expansion of microspheres.

[0017] 2. Due to the good compatibility of POE with SEBS but its incompatibility with physically expanded microspheres, and the "soft-over-hard" nature of the melt, POE falls between SEBS and physically expanded microspheres. The POE surrounding the microbubbles, due to its shear-sensitive characteristics, has a dual function: firstly, it provides a buffer between the microbubbles and the SEBS matrix under shear forces, ensuring the integrity of the microbubble structure during extrusion foaming; secondly, it reduces energy dissipation caused by repeated stretching and / or compression of the physically expanded microspheres in the plastic, facilitating impact absorption and elastic recovery. The synergistic effect of the dispersed phase and the matrix phase gives the SEBS foamed elastomer high strength, high toughness, and high impact absorption, with low fatigue loss.

[0018] 3. High-strength, high-toughness, and high-impact-absorbing SEBS plastic foam elastomer possesses excellent mechanical properties and good impact absorption and toughness: (1) Tensile strength is between 3.90-4.70 MPa, elongation at break is between 1500.0-1900.0%, modulus is between 0.70 MPa-1.00 MPa; tensile strength at 300% elongation is between 1.70-2.40 MPa; (2) Vertical absorption deformation is between 1.0 and 2.0 mm, and impact absorption is between 38.0% and 46.0%. Attached Figure Description

[0019] Figure 1 The images are scanning electron microscope (SEM) images of the samples from Example 1 and Comparative Examples 1-2; where (a) is the SEM image of the SEBS plastic foam elastomer from Example 1; (b) is the SEM image of the sample from Comparative Example 1; and (c) is the SEM image of the sample from Comparative Example 2.

[0020] Figure 2 The images shown are scanning electron microscope (SEM) images of the samples from Example 2 and Comparative Examples 3-4; where (a) is the SEM image of the SEBS plastic foam elastomer from Example 2; (b) is the SEM image of the sample from Comparative Example 3; and (c) is the SEM image of the sample from Comparative Example 4.

[0021] Figure 3 The images shown are scanning electron microscope (SEM) images of the samples from Example 3 and Comparative Examples 5-6; where (a) is the SEM image of the SEBS plastic foam elastomer from Example 3; (b) is the SEM image of the sample from Comparative Example 5; and (c) is the SEM image of the sample from Comparative Example 6.

[0022] Figure 4 The images are scanning electron microscope (SEM) images of the samples from Example 4 and Comparative Examples 7-8; where (a) is the SEM image of the SEBS plastic foam elastomer from Example 4; (b) is the SEM image of the sample from Comparative Example 7; and (c) is the SEM image of the sample from Comparative Example 8.

[0023] Figure 5 The images shown are scanning electron microscope (SEM) images of the samples from Example 5 and Comparative Examples 9-10; where (a) is the SEM image of the SEBS plastic foam elastomer from Example 5; (b) is the SEM image of the sample from Comparative Example 9; and (c) is the SEM image of the sample from Comparative Example 10. Detailed Implementation

[0024] The present invention will be further described in detail below with reference to specific embodiments. The hydrogenated styrene-ethylene / butene-styrene copolymer of the present invention has a star-shaped chain structure; the POE has a Shore hardness A of 50-60 and a melt index of 5-13 g / 10 min; the physically expanded microspheres have a particle size of 25.7 ± 2.6 μm; and the naphthenic oil is a saturated naphthenic oil with a kinematic viscosity of 80-100 mmHg at 40°C. 2 / s, wherein the particle size of the light calcium powder is 4000 mesh-8000 mesh.

[0025] To reduce the probability of weather-resistant additives interfering with the SEBS crosslinking reaction, weather-resistant additives such as multi-functional hindered phenolic antioxidant 1010, phosphite antioxidant 168, light stabilizer 2020, and ultraviolet absorber UV326 are pre-encapsulated with POE.

[0026] In the following examples and comparative examples, the temperature settings of each working section of the single-screw extruder are 135°C, 140°C, 150°C, 150°C, and 145°C, respectively, the die head temperature is 140°C, and the screw speed is 100 rpm; the temperature settings of each working section of the twin-screw extruder are 170°C, 175°C, 185°C, 195°C, 210°C, 210°C, 220°C, 220°C, and 225°C, respectively, the die head temperature is 220°C, and the screw speed is 200 rpm.

[0027] Example 1 The mass fractions of POE, multi-functional hindered phenolic antioxidant 1010, phosphite antioxidant 168, light stabilizer 2020, and UV absorber UV326 were 4.0 kg, 0.1 kg, 0.06 kg, 0.1 kg, and 0.06 kg, respectively, and were mixed at high speed for 5 min. Afterward, the mixture was extruded and granulated using a single-screw extruder to obtain weather-resistant pre-coated granules with an average particle size of 0.6 ± 0.1 mm.

[0028] SEBS and naphthenic oil were mixed at 20.0 kg and 20.0 kg respectively, and stirred at high speed for 5 min, followed by curing for 10 min. Then, 0.1 kg of 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane and 0.2 kg of trimethylolpropane triacrylate were added, and stirred at high speed for 10 min. Finally, 6.0 kg of light calcium powder was added, and stirred at high speed for 10 min. The mixture was then fed into the main feed inlet at a feed speed of 8.0 ± 0.05 rpm. 0.6 kg of physically expanded microspheres and the pre-coated granules of the aforementioned weather-resistant additives were stirred at high speed for 5 min, and then fed into the second feed inlet at a feed speed of 0.8 ± 0.05 rpm, at which point the gel content was 3.3%. After extrusion molding using a twin-screw extruder, SEBS plastic foam elastomer was obtained.

[0029] Comparative Example 1 SEBS and naphthenic oil were mixed at 20.0 kg and 20.0 kg respectively, and stirred at high speed for 5 min, followed by maturation for 10 min. Then, 0.1 kg of 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane and 0.2 kg of trimethylolpropane triacrylate were added, and stirred at high speed for 10 min. Next, 6.0 kg of light calcium powder was added, and stirred at high speed for 10 min. Finally, 0.6 kg of physically expanded microspheres, 0.1 kg of multi-functional hindered phenolic antioxidant 1010, 0.06 kg of phosphite antioxidant 168, 0.1 kg of light stabilizer 2020, and 0.06 kg of UV absorber UV326 were added, and stirred at high speed for 5 min. The mixture was then extruded using a twin-screw extruder.

[0030] Comparative Example 2 Pre-coated granules for weather resistance additives were prepared according to Example 1.

[0031] SEBS and naphthenic oil were mixed at 20.0 kg and 20.0 kg respectively, and stirred at high speed for 5 min, followed by maturation for 10 min. Then, 6.0 kg of light calcium powder was added and stirred at high speed for 10 min. Afterward, the mixture was fed into the main feed port at a feed speed of 8.0 ± 0.05 rpm. 0.6 kg of physically expanded microspheres and the pre-coated granules of the aforementioned weather-resistant additives were stirred at high speed for 5 min and fed into the second feed port at a feed speed of 0.8 ± 0.05 rpm. Finally, the mixture was extruded using a twin-screw extruder.

[0032] Example 2 The mass fractions of POE, multi-functional hindered phenolic antioxidant 1010, phosphite antioxidant 168, light stabilizer 2020, and UV absorber UV326 were 6.0 kg, 0.1 kg, 0.06 kg, 0.1 kg, and 0.06 kg, respectively, and were mixed at high speed for 5 min. Afterward, the mixture was extruded and granulated using a single-screw extruder to obtain weather-resistant pre-coated granules with an average particle size of 0.6 ± 0.1 mm.

[0033] SEBS and naphthenic oil were mixed at 20.0 kg and 30.0 kg respectively, and stirred at high speed for 5 min, followed by curing for 10 min. Then, 0.2 kg of 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane and 0.2 kg of trimethylolpropane triacrylate were added, and the mixture was stirred at high speed for 10 min. Finally, 6.0 kg of light calcium powder was added, and the mixture was stirred at high speed for 10 min. The mixture was then fed into the main feed inlet at a feed speed of 8.0 ± 0.05 rpm. 1.0 kg of physically expanded microspheres and the pre-coated granules of the aforementioned weather-resistant additives were stirred at high speed for 5 min, and then fed into the second feed inlet at a feed speed of 1.0 ± 0.05 rpm, at which point the gel content was 3.0%. After extrusion molding using a twin-screw extruder, SEBS foamed elastomer was obtained.

[0034] Comparative Example 3 SEBS and naphthenic oil were mixed at 20.0 kg and 30.0 kg respectively, stirred at high speed for 5 min, and matured for 10 min. Then, 0.2 kg of 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane and 0.2 kg of trimethylolpropane triacrylate were added, and the mixture was stirred at high speed for 10 min. Next, 6.0 kg of light calcium powder was added, and the mixture was stirred at high speed for 10 min. Finally, 1.0 kg of physically expanded microspheres, 0.1 kg of multi-functional hindered phenolic antioxidant 1010, 0.06 kg of phosphite antioxidant 168, 0.1 kg of light stabilizer 2020, and 0.06 kg of UV absorber UV326 were added, and the mixture was stirred at high speed for 5 min. The mixture was then extruded using a twin-screw extruder.

[0035] Comparative Example 4 Pre-coated granules for weather resistance additives were prepared according to Example 2.

[0036] SEBS and naphthenic oil were mixed at 20.0 kg and 30.0 kg respectively, stirred at high speed for 5 min, and matured for 10 min. 6.0 kg of light calcium powder was added, and the mixture was stirred at high speed for 10 min. Then, the mixture was fed into the main feed port at a feed speed of 8.0 ± 0.05 rpm. 1.0 kg of physically expanded microspheres and the pre-coated granules of the aforementioned weather-resistant additives were stirred at high speed for 5 min and fed into the second feed port at a feed speed of 1.0 ± 0.05 rpm. The mixture was then extruded using a twin-screw extruder.

[0037] Example 3 The mass fractions of POE, multi-functional hindered phenolic antioxidant 1010, phosphite antioxidant 168, light stabilizer 2020, and UV absorber UV326 were 5.0 kg, 0.1 kg, 0.06 kg, 0.1 kg, and 0.06 kg, respectively, and were mixed at high speed for 5 min. Afterward, the mixture was extruded and granulated using a single-screw extruder to obtain weather-resistant pre-coated granules with an average particle size of 0.6 ± 0.1 mm.

[0038] SEBS and naphthenic oil were mixed at 20.0 kg and 24.0 kg respectively, and stirred at high speed for 5 min, followed by curing for 10 min. Then, 0.2 kg of 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane and 0.3 kg of trimethylolpropane triacrylate were added, and stirred at high speed for 10 min. Finally, 6.0 kg of light calcium powder was added, and stirred at high speed for 10 min. The mixture was then fed into the main feed inlet at a feed speed of 8.0 ± 0.05 rpm. 0.7 kg of physically expanded microspheres and the pre-coated granules of the aforementioned weather-resistant additives were stirred at high speed for 5 min, and then fed into the second feed inlet at a feed speed of 0.9 ± 0.05 rpm, at which point the gel content was 2.6%. After extrusion molding using a twin-screw extruder, SEBS plastic foam elastomer was obtained.

[0039] Comparative Example 5 SEBS and naphthenic oil were mixed at 20.0 kg and 24.0 kg respectively, stirred at high speed for 5 min, and then matured for 10 min. 0.2 kg of 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane and 0.3 kg of trimethylolpropane triacrylate were added, and the mixture was stirred at high speed for 10 min. 6.0 kg of light calcium powder was added, and the mixture was stirred at high speed for 10 min. 0.7 kg of physically expanded microspheres, 0.1 kg of multi-functional hindered phenolic antioxidant 1010, 0.06 kg of phosphite antioxidant 168, 0.1 kg of light stabilizer 2020, and 0.06 kg of UV absorber UV326 were added, and the mixture was stirred at high speed for 5 min. The mixture was then extruded using a twin-screw extruder.

[0040] Comparative Example 6 Pre-coated granules for weather resistance additives were prepared according to Example 3.

[0041] SEBS and naphthenic oil were mixed at 20.0 kg and 24.0 kg respectively, and stirred at high speed for 5 min, followed by maturation for 10 min. Then, 6.0 kg of light calcium powder was added and stirred at high speed for 10 min. Afterward, the mixture was fed into the main feed port at a feed speed of 8.0 ± 0.05 rpm. 0.7 kg of physically expanded microspheres and the pre-coated granules of the aforementioned weather-resistant additives were stirred at high speed for 5 min and fed into the second feed port at a feed speed of 0.9 ± 0.05 rpm. Finally, the mixture was extruded using a twin-screw extruder.

[0042] Example 4 The mass fractions of POE, multi-functional hindered phenolic antioxidant 1010, phosphite antioxidant 168, light stabilizer 2020, and UV absorber UV326 were 5.5 kg, 0.1 kg, 0.06 kg, 0.1 kg, and 0.06 kg, respectively, and were mixed at high speed for 5 min. Afterward, the mixture was extruded and granulated using a single-screw extruder to obtain weather-resistant pre-coated granules with an average particle size of 0.6 ± 0.1 mm.

[0043] SEBS and naphthenic oil were mixed at 20.0 kg and 22.0 kg respectively, and stirred at high speed for 5 min, followed by curing for 10 min. Then, 0.2 kg of 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane and 0.4 kg of trimethylolpropane triacrylate were added, and stirred at high speed for 10 min. Finally, 6.0 kg of light calcium powder was added, and stirred at high speed for 10 min. The mixture was then fed into the main feed inlet at a feed speed of 8.0 ± 0.05 rpm. 0.8 kg of physically expanded microspheres and the pre-coated granules of the aforementioned weather-resistant additives were stirred at high speed for 5 min, and then fed into the second feed inlet at a feed speed of 1.0 ± 0.05 rpm, at which point the gel content was 3.4%. After extrusion molding using a twin-screw extruder, SEBS plastic foam elastomer was obtained.

[0044] Comparative Example 7 SEBS and naphthenic oil were mixed at 20.0 kg and 22.0 kg respectively, stirred at high speed for 5 min, and then matured for 10 min. Then, 0.2 kg of 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane and 0.4 kg of trimethylolpropane triacrylate were added, and the mixture was stirred at high speed for 10 min. Next, 6.0 kg of light calcium powder was added, and the mixture was stirred at high speed for 10 min. Finally, 0.8 kg of physically expanded microspheres, 0.1 kg of multi-functional hindered phenolic antioxidant 1010, 0.06 kg of phosphite antioxidant 168, 0.1 kg of light stabilizer 2020, and 0.06 kg of UV absorber UV326 were added, and the mixture was stirred at high speed for 5 min. The mixture was then extruded using a twin-screw extruder.

[0045] Comparative Example 8 Pre-coated granules for weather resistance additives were prepared according to Example 4.

[0046] SEBS and naphthenic oil were mixed at 20.0 kg and 22.0 kg respectively, stirred at high speed for 5 min, and matured for 10 min. Then, 6.0 kg of light calcium powder was added and stirred at high speed for 10 min. Afterward, the mixture was fed into the main feed port at a feed speed of 8.0 ± 0.05 rpm. 0.8 kg of physically expanded microspheres and the pre-coated granules of the aforementioned weather-resistant additives were stirred at high speed for 5 min and then fed into the second feed port at a feed speed of 1.0 ± 0.05 rpm. Finally, the mixture was extruded using a twin-screw extruder.

[0047] Example 5 The mass fractions of POE, multi-functional hindered phenolic antioxidant 1010, phosphite antioxidant 168, light stabilizer 2020, and UV absorber UV326 were 5.0 kg, 0.1 kg, 0.06 kg, 0.1 kg, and 0.06 kg, respectively, and were mixed at high speed for 5 min. Afterward, the mixture was extruded and granulated using a single-screw extruder to obtain weather-resistant pre-coated granules with an average particle size of 0.6 ± 0.1 mm.

[0048] SEBS and naphthenic oil were mixed at 20.0 kg and 25.0 kg respectively, and stirred at high speed for 5 min, followed by curing for 10 min. Then, 0.1 kg of 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane and 0.3 kg of trimethylolpropane triacrylate were added, and stirred at high speed for 10 min. Finally, 6.0 kg of light calcium powder was added, and stirred at high speed for 10 min. The mixture was then fed into the main feed inlet at a feed speed of 8.0 ± 0.05 rpm. 0.9 kg of physically expanded microspheres and the pre-coated granules of the aforementioned weather-resistant additives were stirred at high speed for 5 min, and then fed into the second feed inlet at a feed speed of 0.9 ± 0.05 rpm, at which point the gel content was 3.5%. After extrusion molding using a twin-screw extruder, SEBS plastic foam elastomer was obtained.

[0049] Comparative Example 9 SEBS and naphthenic oil were mixed at 20.0 kg and 25.0 kg respectively, stirred at high speed for 5 min, and matured for 10 min. Then, 0.1 kg of 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane and 0.3 kg of trimethylolpropane triacrylate were added, and the mixture was stirred at high speed for 10 min. Next, 6.0 kg of light calcium powder was added, and the mixture was stirred at high speed for 10 min. Finally, 0.9 kg of physically expanded microspheres, 0.1 kg of multi-functional hindered phenolic antioxidant 1010, 0.06 kg of phosphite antioxidant 168, 0.1 kg of light stabilizer 2020, and 0.06 kg of UV absorber UV326 were added, and the mixture was stirred at high speed for 5 min. The mixture was then extruded using a twin-screw extruder.

[0050] Comparative Example 10 Pre-coated granules for weather resistance additives were prepared according to Example 4.

[0051] SEBS and naphthenic oil were mixed at 20.0 kg and 25.0 kg respectively, and stirred at high speed for 5 min, followed by maturation for 10 min. Then, 6.0 kg of light calcium powder was added and stirred at high speed for 10 min. Afterward, the mixture was fed into the main feed port at a feed speed of 8.0 ± 0.05 rpm. 0.9 kg of physically expanded microspheres and the pre-coated granules of the aforementioned weather-resistant additives were stirred at high speed for 5 min and then fed into the second feed port at a feed speed of 0.9 ± 0.05 rpm. Finally, the mixture was extruded using a twin-screw extruder.

[0052] The morphology of the samples was characterized using a SU8600 field emission scanning electron microscope. Figures 1-5 As can be observed in the SEM image: In the SEM images of samples from Examples 1 to 5, it can be observed that the pores are distributed as isolated dispersed phase SEBS in the SEBS matrix; the pore size is much larger than the size of the physically expanded microspheres of the material; the SEBS matrix has its unique "worm-like" structure.

[0053] In the SEM images of Comparative Examples 1, 3, 5, 7 and 9, the "worm-like" structure characteristic of the SEBS matrix was not observed. The cell size of Comparative Examples 1 and 3 was comparable to the size of the physically expanded microspheres, suggesting that the physically expanded microspheres in Comparative Examples 1 and 3 did not foam. In Comparative Examples 5, 7 and 9, the cell size was much larger than the size of the physically expanded microspheres.

[0054] In the SEM images of samples 2, 4, 6, 8 and 10, the "worm-like" structure characteristic of the SEBS matrix was not observed; the cells were dense, and the spacing between cells was smaller than that of samples 1-5; the cell size was much larger than the size of the material's physically expanded microspheres.

[0055] Referring to GB / T 3516-2024, the gel content of the sample was determined by solvent extraction using xylene as the solvent. Each group of samples was measured twice in parallel, and the average value was taken. The gel content of the sample was calculated according to formula (1).

[0056] In the formula: The mass of the sample; The mass of the sample after extraction.

[0057] In accordance with GB / T 528-2009, the tensile strength, modulus, elongation at break, and 300% tensile strength at a fixed length of the test specimens were tested using an electronic universal testing machine at a tensile rate of 200 mm / min. Each group of specimens was measured in parallel five times, and the average value was taken.

[0058] Referring to GB 36246-2018, the vertical deformation and impact absorption of the specimens were tested using a falling weight oscilloscope impact tester. The vertical deformation was determined by taking the average value of three parallel measurements at the specimen locations. The impact absorption was calculated according to formula (2).

[0059] In the formula: Impact absorption of energy; The initial potential energy of the falling hammer.

[0060] The morphology of the samples was characterized using a SU8600 field emission scanning electron microscope.

[0061] High-strength, high-toughness, and high-impact-absorbing SEBS plastic foam elastomers have a gel content ranging from 9% to 17.9%, exhibiting excellent impact absorption and toughness. Vertical absorption deformation ranges from 1.0 to 2.0 mm, and impact absorption is between 38.0% and 46.0%. They possess superior mechanical properties, with tensile strength ranging from 3.90 MPa to 4.7 MPa, modulus from 0.70 MPa to 1.00 MPa, and elongation at break ranging from 1500.0% to 1900.0%; 300% strength at a constant length ranges from 1.70 MPa to 2.40 MPa.

[0062] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications, equivalent substitutions, and improvements made by those skilled in the art within the scope of the technology disclosed in the present invention, and within the spirit and principles of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A high-strength, high-toughness, high-impact-absorbing SEBS plastic foam elastomer, characterized in that, It is made from the following components in parts by weight:

2. The high-strength, high-toughness, and high-impact-absorbing SEBS plastic foam elastomer according to claim 1, characterized in that, The hydrogenated styrene-ethylene / butene-styrene copolymer has a star-shaped chain structure.

3. The high-strength, high-toughness, and high-impact-absorbing SEBS plastic foam elastomer according to claim 1, characterized in that, The POE has a Shore hardness of 50-60 and a melt flow index of 5-13 g / 10 min.

4. The high-strength, high-toughness, high-impact-absorbing SEBS plastic foam elastomer according to claim 1, characterized in that, The physically expanded microspheres have a particle size of 25.7 ± 2.6 μm.

5. The high-strength, high-toughness, and high-impact-absorbing SEBS plastic foam elastomer according to claim 1, characterized in that, The naphthenic oil is a saturated naphthenic oil with a kinematic viscosity of 80-100 mm at 40°C. 2 / s.

6. The high-strength, high-toughness, and high-impact-absorbing SEBS plastic foam elastomer according to claim 1, characterized in that, The particle size of the light calcium powder is 4000-8000 mesh.

7. The method for preparing a high-strength, high-toughness, high-impact-absorbing SEBS plastic foam elastomer according to claim 1, characterized in that, Includes the following steps: (1) Weigh out POE, multi-functional hindered phenolic antioxidant 1010, phosphite antioxidant 168, light stabilizer 2020 and ultraviolet absorber UV326 according to the ratio, mix them at high speed for 10 min, and extrude and granulate them through a single screw extruder to obtain weather-resistant additive pre-coated granules. (2) Weigh SEBS and naphthenic oil according to the ratio, add them to a twin-screw extruder, mix at high speed for 5 min, and mature for 10 min. Weigh and add 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane and trimethylolpropane triacrylate according to the ratio, and mix at high speed for 10 min. Weigh and add light calcium powder according to the ratio, mix at high speed for 10 min, and feed it into the main feed port. Weigh the physically expanded microspheres according to the ratio, and mix them with the weather-resistant additive pre-coated granules obtained in step (1) at high speed for 5 min, and feed them into the second feed port. At this time, the SEBS gel content is between 3±0.5%, and it is extruded and formed by twin-screw extruder.

8. The method for preparing a high-strength, high-toughness, high-impact-absorbing SEBS plastic foam elastomer according to claim 7, characterized in that, In step (1), the temperatures of each working section of the single screw extruder are set to 135°C, 140°C, 150°C, 150°C, and 145°C, respectively, the die head temperature is 140°C, and the screw speed is 100 rpm.

9. The method for preparing a high-strength, high-toughness, high-impact-absorbing SEBS plastic foam elastomer according to claim 7, characterized in that, In step (2), the temperatures of each working section of the twin-screw extruder are set to 170°C, 175°C, 185°C, 195°C, 210°C, 210°C, 220°C, 220°C, and 225°C, respectively, the die head temperature is 220°C, and the screw speed is 200 rpm.

10. The method for preparing a high-strength, high-toughness, high-impact-absorbing SEBS plastic foam elastomer according to claim 7, characterized in that, In steps (1) and (2), the high-speed stirring speed is 450. 10 revolutions per minute.

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