Bio-based TPE (Thermoplastic Elastomer) material

Abstract

The invention relates to a bio-based TPE (Thermoplastic Elastomer) material. The bio-based TPE material is prepared from the following components in parts by mass: 50 to 100 parts of bio-based SEBS (Styrene-Ethylene-Butylene-Styrene), 50 to 100 parts of white oil, 100 to 200 parts of bio-based raw materials, 50 to 100 parts of bio-based filler, 5 to 10 parts of anti-UV (Ultraviolet) agent and 5 to 10 parts of antioxidant, the bio-based raw material comprises any one or a mixture of more of bio-based PE (polyethylene), bio-based EVA (ethylene vinyl acetate), bio-based TPU (thermoplastic polyurethane) and bio-based POE (polyolefin elastomer); the bio-based filler comprises a bamboo fiber composite material and a lignin compound, and the lignin compound comprises lignin, 3-2-hydroxypropyl trimethyl ammonium chloride and nano-silver. The environment-friendly effect of the thermal elastomer material is improved.

Description

Technical Field

[0001] This application relates to the field of thermoelastic materials, and particularly to a bio-based TPE thermoelastic material. Background Art

[0002] Thermoplastic elastomer TPE, also known as artificial rubber or synthetic rubber. Its products have both the excellent properties of traditional cross-linked vulcanized rubber such as high elasticity, aging resistance, and oil resistance, and at the same time have the characteristics of convenient processing and a wide range of processing methods of ordinary plastics.

[0003] TPE materials generally use fossil resources as the base material, but it is difficult to meet the requirements of sustainable development with fossil resources as the base material, so it needs to be improved. Summary of the Invention

[0004] In order to meet the sustainable development requirements of TPE thermoelastic materials, this application provides a bio-based TPE thermoelastic material.

[0005] The bio-based TPE thermoelastic material provided by this application adopts the following technical solutions: A bio-based TPE thermoelastic material, comprising the following components in parts by mass: 50 - 100 parts of bio-based SEBS, 50 - 100 parts of white oil, 100 - 200 parts of bio-based raw materials, 50 - 100 parts of bio-based fillers, 5 - 10 parts of anti-UV agent, 5 - 10 parts of antioxidant; The bio-based raw materials include any one or a mixture of bio-based PE, bio-based EVA, bio-based TPU, and bio-based POE; The bio-based fillers include bamboo fiber composites and lignin composites, and the lignin composites include lignin, 3 - 2-hydroxypropyltrimethylammonium chloride, and silver nanoparticles.

[0006] By adopting the above technical solutions, using renewable bio-based materials such as bio-based SEBS, bio-based PE, bio-based EVA, bio-based TPU, bio-based POE, etc., through the transformation of bio-based TPE, the sustainable development requirements of TPE elastomers are further improved, thereby enhancing the green environmental protection performance of TPE elastomers; at the same time, the bio-based filler prepared by adding bamboo limiting complex and lignin complex can effectively reduce the carbon footprint, thereby further enhancing the sustainable development performance of the thermoelastic body. The lignin complex is prepared from lignin, 3-2-hydroxypropyltrimethylammonium chloride and nano silver. Lignin is a natural macromolecular compound with high calorific value and carbon content, which can effectively improve the tensile strength of the thermoelastic body. 3-2-hydroxypropyltrimethylammonium chloride becomes amphoteric, which can further enhance the stability of lignin, interact with the molecular chains of the thermoelastic body, reduce the deformation effect of the system when stressed, thereby enhancing the overall strength of the system. At the same time, lignin has certain antioxidant properties, which can improve the heat resistance and stability of the thermoelastic body. After adding nano silver particles, not only can the antibacterial performance of the thermoelastic body be further improved, but also the stress can be effectively transmitted and dispersed, making the strength of the elastomer improved.

[0007] Preferably, the lignin complex is prepared by the following method: Mix lignin with water to obtain a lignin solution, adjust the lignin solution to alkaline with sodium hydroxide solution, heat up, add 3-chloro-2-hydroxypropyltrimethylammonium chloride, and maintain the alkalinity with sodium hydroxide solution at the same time. After the reaction, cool and dialyze, and then freeze-dry to obtain amphoteric lignin; mix the prepared amphoteric lignin, nano silver particles and absolute ethanol to obtain a mixed solution, then centrifuge the mixed solution to separate the solid phase and the liquid phase, wash the solid phase and centrifuge again, and freeze-dry to obtain the lignin complex.

[0008] By adopting the above technical solutions, a large number of positively charged groups are contained in the structure of 3-chloro-2-hydroxypropyltrimethylammonium chloride. After modification with lignin, the obtained amphoteric lignin contains negatively charged groups and positively charged groups, thereby further enhancing the stability of the prepared amphoteric lignin and making the combination with nano silver particles more stable, thereby further enhancing the strength and antibacterial performance of the lignin complex.

[0009] Preferably, the mass ratio of 3-chloro-2-hydroxypropyltrimethylammonium chloride, lignin and nano silver is (1.7-1.9):1:2.4.

[0010] By adopting the above technical solutions, preferably, the mass ratio of 3-chloro-2-hydroxypropyltrimethylammonium chloride, lignin and nano silver is within the above range, which can further enhance the stability of the prepared lignin complex.

[0011] Preferably, the bamboo fiber composite material comprises bamboo fibers, dopamine and modified alumina.

[0012] By adopting the above technical scheme, bamboo fibers have the advantages of high strength, high hardness, etc. When added to the system, they can effectively improve the bonding performance among various components in the system. Then, by modifying the bamboo fibers with dopamine, the performance of the interface of the bamboo-limited reinforced composite material can be further enhanced, and the free hydroxyl groups on the surface of the bamboo fibers can be reduced, lowering the surface polarity. At the same time, the thermal stability of the system can be further improved. Introducing alumina particles as toughening fillers can further enhance the overall impact resistance of the body, thereby further improving the stability of the thermoelastic body.

[0013] Preferably, the modified alumina is prepared by the following method: Mix absolute ethanol and a citric acid solution, then add the silane coupling agent KH-560, stir magnetically, and let it stand to obtain a silane coupling agent solution. Add nano-alumina to the silane coupling agent solution, stir magnetically, then heat in a water bath, continue to stir magnetically, pour out the supernatant after cooling, separate by suction filtration, wash, and then dry in vacuum to obtain modified alumina.

[0014] Nano-alumina has high free energy and a high specific surface area. The hydroxyl groups adsorbed on the surface of nano-alumina form hydrogen bonds, resulting in agglomeration, which affects the overall stability of the system. By adopting the above technical scheme, after modifying the surface of alumina with a silane coupling agent, the dispersion uniformity of alumina in the system is improved, and the stability of the prepared elastomer material is further enhanced.

[0015] Preferably, the mass concentration of KH-560 in the silane coupling agent solution is 1.9 - 2.1%.

[0016] By adopting the above technical scheme, preferably, the mass concentration of KH-560 is within the above range, which can further improve the stability of the prepared modified alumina.

[0017] Preferably, the bamboo fiber composite material is prepared by the following method: Mix deionized water and Tris buffer solution to obtain a Tris solution. Add hydrochloric acid dopamine to the Tris solution and stir to obtain a dopamine dispersion. Immerse bamboo fibers in the dopamine dispersion, filter, wash, and then dry to obtain modified bamboo fibers. Mix the modified bamboo fibers, modified alumina and polyethylene terephthalate to obtain a bamboo fiber composite material.

[0018] By adopting the above technical solution, after the bamboo fiber modified by dopamine is combined with the modified alumina, the performance of the prepared bamboo fiber composite material can be synergistically improved, the toughness of the elastic material is further improved, and the binding performance of each component in the system is improved, further enhancing the stability of the prepared elastomer.

[0019] Preferably, the mass ratio of the modified bamboo fiber, the modified alumina to polyethylene terephthalate is 1:(0.06 - 0.1):2.2.

[0020] By adopting the above technical solution, preferably, the mass ratio of the bamboo fiber, dopamine to the modified alumina is within the above range, which can further improve the overall stability of the prepared bamboo fiber composite material.

[0021] Preferably, the mass ratio of the bamboo fiber composite material to the lignin complex is (1.4 - 1.6):1.

[0022] By adopting the above technical solution, preferably, the mass ratio of the bamboo fiber composite material to the lignin complex is within the above range, which can further improve the stability of the elastomer.

[0023] In summary, the present application includes at least one of the following beneficial technical effects: 1. Adding bio-based raw materials based on bio-based PE, bio-based EVA, bio-based TPU, and bio-based POE to the system, thereby improving the green environmental protection performance of the thermoelastic material. At the same time, adding bamboo fiber composite material and lignin complex as bio-based fillers in the system can further reduce the carbon footprint and improve the overall stability of the thermoelastic material, and further improve the tensile strength. After adding nano silver ions, the antibacterial and antioxidant properties of the thermoelastic material are improved, thus extending the service life of the thermoelastic material; 2. After modifying lignin with 3-chloro-2-hydroxypropyltrimethylammonium chloride to obtain amphoteric lignin, the stability and loading rate of lignin in the system are effectively improved, thereby improving the loading rate of nano silver particles and further enhancing the comprehensive performance of the lignin complex; 3. Modifying bamboo fiber with dopamine and then combining it with the modified alumina to prepare a bamboo fiber composite material. The bamboo fiber composite material has good strength, and at the same time can improve the connection performance between each component, further enhancing the overall performance of the thermoelastic material. Specific Embodiments

[0024] The following further elaborates the present application in detail with reference to embodiments: Raw material description: All raw materials in the examples can be obtained commercially; KH-560 is γ-glycidoxypropyltrimethoxysilane (CAS No.: 2530-83-8); the anti-UV agent is UV absorber UV-326 (CAS No.: 3896-11-5); the antioxidant is antioxidant 1010 (CAS No.: 6683-19-8).

[0025] Example 1 Preparation of lignin complex: Mix 50 g of lignin (CAS No.: 8068-05-1) with 500 g of deionized water to obtain a lignin solution. Adjust the pH of the lignin solution to 12 using 20 wt% sodium hydroxide solution. Then heat the lignin solution to 85 °C, add 29.41 g of 3-chloro-2-hydroxypropyltrimethylammonium chloride (CAS No.: 3327-22-8), and continue to add 20 wt% sodium hydroxide solution to maintain the pH of the solution at 12. After reacting for 4 h, cool the product to 25 °C, dialyze it in a dialysis bag with a molecular weight cutoff of 1000, and then transfer it to a -20 °C freezer for freeze-drying for 18 h to obtain amphoteric lignin. Mix the prepared amphoteric lignin, 70.59 g of nano-silver, and 500 g of absolute ethanol to obtain a mixture. Then centrifuge the mixture at 10000 rpm for 10 min to separate the solid phase and the liquid phase. Wash the solid phase with ultrapure water and centrifuge again, and then freeze-dry it at -20 °C for 18 h to obtain the lignin complex.

[0026] Preparation of modified alumina: Mix 100 g of absolute ethanol and 60 g of a 10 wt% citric acid solution, adjust the pH of the system to 3, then add KH-560, and stir magnetically for 3 min. Let it stand for 1 h to obtain a silane coupling agent solution with a mass concentration of KH-560 of 1.8%. Add 10 g of nano-alumina to the silane coupling agent solution, stir magnetically for 10 min, then heat it in a water bath to 80 °C, and continue to stir magnetically at this temperature for 2 h. Then cool it to 25 °C, pour out the supernatant, add absolute ethanol for suction filtration separation, wash it, and then vacuum-dry it in a vacuum drying oven at 60 °C for 12 h. After grinding, modified alumina is obtained.

[0027] Preparation of bamboo fiber composite material: Mix deionized water with Tris buffer solution to obtain a Tris solution with a pH of 8.5. Add dopamine hydrochloride (CAS No.: 62-31-7) to the Tris solution so that the mass concentration of dopamine hydrochloride is 1.9%. Then stir at a speed of 300 rpm at a temperature of 25 °C for 2 h to obtain a dopamine dispersion. Put 50 g of bamboo fibers into the dopamine dispersion, impregnate for 2 h, filter and wash, and then dry in an oven at 105 °C for 8 h to obtain modified bamboo fibers. Mix 30.67 g of modified bamboo fibers, 1.85 g of modified alumina and 67.48 g of polyethylene terephthalate (CAS No.: 25038-59-9), and mix evenly at a speed of 160 rpm to obtain a bamboo fiber composite material.

[0028] Prepare a thermoelastic material: Mix 50 g of bio-based SEBS (CAS No.: 124578-11-6), 50 g of white oil, 100 g of bio-based raw materials, 50 g of bio-based fillers, 50 g of UV-resistant agent and 5 g of antioxidant, then add them to a high-speed mixer and mix at a speed of 120 revolutions per minute. After mixing, transfer to a twin-screw extruder for melting, plasticizing and pelletizing to obtain a bio-based TPE elastic material.

[0029] Among them, the bio-based raw materials are a mixture of bio-based PE (CAS No.: 9002-88-4), bio-based EVA (CAS No.: 24937-78-8), bio-based TPU (CAS No.: 25085-34-1), and bio-based POE (CAS No.: 9004-83-5) in a mass ratio of 1:1:1:1.

[0030] Example 2 Prepare a lignin complex: Mix 53.78 g of lignin with 500 g of deionized water to obtain a lignin solution. Use 20 wt% sodium hydroxide solution to adjust the pH of the lignin solution to 12. Then heat the lignin solution to 85 °C, add 28.3 g of 3-chloro-2-hydroxypropyltrimethylammonium chloride, and continue to add 20 wt% sodium hydroxide solution to keep the pH of the solution at 12. After reacting for 4 h, cool the product to 25 °C, dialyze in a dialysis bag with a molecular weight cut-off of 1000, and then transfer to a freezer at -20 °C for freeze-drying for 18 h to obtain amphoteric lignin; mix the prepared amphoteric lignin, 67.92 g of silver nanoparticles and 500 g of absolute ethanol to obtain a mixed solution. Then centrifuge the mixed solution at a speed of 10000 rpm for 10 min to separate the solid phase and the liquid phase. Wash the solid phase with ultrapure water and centrifuge again, and freeze-dry at a temperature of -20 °C for 18 h to obtain a lignin complex.

[0031] Preparation of modified alumina: Mix 100 g of absolute ethanol and 60 g of a citric acid solution with a mass fraction of 10 wt%, adjust the pH of the system to 3, then add KH-560, stir magnetically for 3 min, and let stand for 1 h to obtain a silane coupling agent solution with a mass concentration of KH-560 of 2.2%. Add 10 g of nano-alumina to the silane coupling agent solution, stir magnetically for 10 min, then heat in a water bath to 80 °C, continue to stir magnetically at this temperature for 2 h, then cool to 25 °C, pour out the supernatant, add absolute ethanol for suction filtration separation, wash, and then vacuum dry in a vacuum drying oven at 60 °C for 12 h, and grind to obtain modified alumina.

[0032] Preparation of bamboo fiber composite: Mix deionized water and Tris buffer solution to obtain a Tris solution with a pH of 8.5. Add hydrochloric acid dopamine to the Tris solution so that the mass concentration of hydrochloric acid dopamine is 2.1%, and then stir at a speed of 300 rpm at 25 °C for 2 h to obtain a dopamine dispersion. Put 50 g of bamboo fiber into the dopamine dispersion, soak for 2 h, filter and wash, and then dry in an oven at 105 °C for 8 h to obtain modified bamboo fiber. Mix 30.3 g of modified bamboo fiber, 3.03 g of modified alumina and 66.67 g of polyethylene terephthalate, and mix evenly at a speed of 160 rpm to obtain a bamboo fiber composite.

[0033] Preparation of thermoelastic material: Mix 100 g of bio-based SEBS, 100 g of white oil, 200 g of bio-based raw materials, 100 g of bio-based filler, 10 g of UV-resistant agent and 10 g of antioxidant, then add them to a high-speed mixer and mix at a speed of 120 revolutions per minute. After mixing, transfer to a twin-screw extruder for melting, plasticizing and pelletizing to obtain a bio-based TPE elastomer material.

[0034] Among them, the bio-based raw materials are a mixture of bio-based PE, bio-based EVA, bio-based TPU, and bio-based POE in a mass ratio of 1:1:1:1.

[0035] Example 3 Preparation of lignin complex: 51.92 g of lignin was mixed with 500 g of deionized water to obtain a lignin solution. The pH of the lignin solution was adjusted to 12 using a 20 wt% sodium hydroxide solution. Then, the lignin solution was heated to 85 °C, and 28.85 g of 3-chloro-2-hydroxypropyltrimethylammonium chloride was added. Meanwhile, a 20 wt% sodium hydroxide solution was continuously added to maintain the pH of the solution at 12. After reacting for 4 h, the product was cooled to 25 °C, dialyzed in a dialysis bag with a molecular weight cut-off of 1000, and then transferred to a freezer at -20 °C for freeze-drying for 18 h to obtain amphoteric lignin. The prepared amphoteric lignin, 69.23 g of silver nanoparticles, and 500 g of absolute ethanol were mixed to obtain a mixed solution. Then, the mixed solution was centrifuged at 10,000 rpm for 10 min in a centrifuge to separate the solid phase and the liquid phase. The solid phase was washed with ultrapure water and then centrifuged again, and freeze-dried at -20 °C for 18 h to obtain a lignin composite.

[0036] Preparation of modified alumina: 100 g of absolute ethanol and 60 g of a 10 wt% citric acid solution were mixed, and the pH of the system was adjusted to 3. Then, KH-560 was added, and magnetic stirring was carried out for 3 min, followed by standing for 1 h to obtain a silane coupling agent solution with a mass concentration of 2% of KH-560. 10 g of nano-alumina was added to the silane coupling agent solution, and magnetic stirring was carried out for 10 min. Then, it was heated in a water bath to 80 °C, and magnetic stirring was continued at this temperature for 2 h. Then, it was cooled to 25 °C, the supernatant was poured out, and absolute ethanol was added for suction filtration separation. After washing, it was vacuum dried in a vacuum drying oven at 60 °C for 12 h, and then ground to obtain modified alumina.

[0037] Preparation of bamboo fiber composite: Deionized water and Tris buffer were mixed to obtain a Tris solution with a pH of 8.5. Dopamine hydrochloride was added to the Tris solution to make the mass concentration of dopamine hydrochloride 2%. Then, it was stirred at 300 rpm at 25 °C for 2 h to obtain a dopamine dispersion. 50 g of bamboo fibers were put into the dopamine dispersion and impregnated for 2 h. After filtration and washing, it was dried in an oven at 105 °C for 8 h to obtain modified bamboo fibers. 30.49 g of modified bamboo fibers, 2.44 g of modified alumina, and 67.07 g of polyethylene terephthalate were mixed and uniformly mixed at 160 rpm to obtain a bamboo fiber composite.

[0038] Preparation of thermoelastic material: After mixing 75 g of bio-based SEBS, 75 g of white oil, 150 g of bio-based raw material, 75 g of bio-based filler, 8 g of UV inhibitor and 8 g of antioxidant, add them to a high-speed mixer and mix at a speed of 120 revolutions per minute. After mixing, transfer them to a twin-screw extruder for melting, plasticizing and pelletizing to obtain a bio-based TPE elastomer material.

[0039] Among them, the bio-based raw material is obtained by mixing bio-based PE, bio-based EVA, bio-based TPU, and bio-based POE in a mass ratio of 1:1:1:1.

[0040] Example 4 Example 4 is based on Example 3. The difference between Example 4 and Example 3 is that when preparing the lignin complex in Example 4, 43.75 g of lignin, 31.25 g of 3-chloro-2-hydroxypropyltrimethylammonium chloride, and 75 g of nano silver particles are used.

[0041] Example 5 Example 5 is based on Example 3. The difference between Example 5 and Example 3 is that when preparing the lignin complex in Example 5, 58.92 g of lignin, 26.79 g of 3-chloro-2-hydroxypropyltrimethylammonium chloride, and 64.29 g of nano silver particles are used.

[0042] Example 6 Example 6 is based on Example 3. The difference between Example 6 and Example 3 is that when preparing the modified alumina in Example 6, the mass concentration of KH-560 in the silane coupling agent solution is 1.5%.

[0043] Example 7 Example 7 is based on Example 3. The difference between Example 7 and Example 3 is that when preparing the modified alumina in Example 7, the mass concentration of KH-560 in the silane coupling agent solution is 2.5%.

[0044] Example 8 Example 8 is based on Example 3. The difference between Example 8 and Example 3 is that when preparing the bamboo fiber composite in Example 8, the usage amount of the modified bamboo fiber is 30.96 g, the usage amount of the modified alumina is 0.93 g, and the usage amount of polyethylene terephthalate is 68.11 g.

[0045] Example 9 Example 9 is based on Example 3. The difference between Example 9 and Example 3 is that when preparing the bamboo fiber composite in Example 9, the modified bamboo fiber is replaced with an equal amount of unmodified bamboo fiber.

[0046] Example 10 Example 10 is based on Example 3. The difference between Example 10 and Example 3 is that when preparing the bamboo fiber composite material in Example 10, the modified alumina is replaced by unmodified alumina.

[0047] Example 11 Example 11 is based on Example 3. The difference between Example 11 and Example 3 is that when preparing the bio-based filler in Example 11, 3-chloro-2-hydroxypropyl trimethyl ammonium chloride is not added.

[0048] Example 12 Example 12 is based on Example 3. The difference between Example 12 and Example 3 is that when preparing the bio-based filler in Example 12, nano silver particles are not added.

[0049] Comparative Example 1 Comparative Example 1 is based on Example 3. In Comparative Example 1, the bamboo fiber composite material in the bio-based filler is replaced by an equal amount of ordinary bamboo fiber.

[0050] Comparative Example 2 Comparative Example 2 is based on Example 3. In Comparative Example 2, the lignin complex in the bio-based filler is replaced by an equal amount of lignin.

[0051] Performance detection test The following performance tests are carried out on the specimens of Examples 1-12 and Comparative Examples 1-2: (1) Antibacterial performance test: Taking "GB21551.2-2010 1" as the detection standard, sampling and detecting the specimens, each specimen is detected 3 times, and the detection results are filled in Table 1; (2) Tensile strength performance test: Taking "ASTM D412" as the detection standard, detecting the specimens, each specimen is detected 3 times, taking the average value, and filling the test results in Table 1; (3) Thermal aging performance test According to GB / T2951.12, evaluate the short-term aging resistance test of the above test samples, the aging test conditions are 158 °C, the aging period is 168 h, and 180 °C, 168 h; Table 1 Performance test results of Examples 1-12 and Comparative Examples 1-2 As can be seen from Table 1, the antibacterial grades of Examples 1-3 are all Grade 1, indicating that the thermoelastic body prepared in this application has good antibacterial properties; the tensile strengths of Examples 1-3 are all 32 MPa or above, indicating that the thermoelastic body prepared in this application has good strength; after thermal aging of Examples 1-3, the retention rates of tensile strength are all above 87%, indicating that the thermoelastic body prepared in this application has good thermal aging resistance.

[0052] In Examples 4 and 5 during the preparation of the lignin complex, the mass ratios among lignin, 3-chloro-2-hydroxypropyltrimethylammonium chloride, and silver nanoparticles are not within the scope defined in this application. When the content of lignin is too low, it is difficult for excessive silver nanoparticles to be further loaded onto lignin, resulting in a decrease in the content of silver nanoparticles, a decline in the overall antibacterial performance of the system, and it is also difficult to further improve the overall strength and stability of the system. Moreover, the synergistic antibacterial performance between lignin and silver nanoparticles also decreases. When the content of lignin is too high, it is difficult for 3-2-hydroxypropyltrimethylammonium chloride to modify excessive lignin, and it is difficult to further improve the stability of lignin. At the same time, the content of silver nanoparticles decreases, and it is also difficult to further increase the loading rate of lignin on silver nanoparticles, affecting the overall performance of the system. Therefore, the antibacterial performance, strength, and aging resistance of Examples 4 and 5 are all affected.

[0053] In Examples 6 and 7 during the preparation of modified alumina, the concentrations of KH-560 in the silane coupling agent solution are not within the scope defined in this application. When the concentration of KH-560 is too low, it is difficult to further modify alumina, and it is difficult to improve the dispersibility of alumina, resulting in agglomeration in the system and affecting the overall stability of the system; when the concentration of KH-560 is too high, it will cause the surface active sites of alumina to be overly saturated, and it will also cause alumina to agglomerate, resulting in a decrease in stability. Therefore, the performance of Examples 6 and 7 both decreases.

[0054] In Examples 8 and 9 during the preparation of the bamboo fiber composite, the mass ratios among the modified bamboo fiber, modified alumina, and polyethylene terephthalate are not within the scope defined in this application. When the content of modified alumina is too low, it is difficult to synergistically improve the strength of the thermoelastic body with the bamboo fiber, so it is difficult to improve the strength of the prepared thermoelastic body material; when the content of modified alumina is too high, it is difficult to improve the dispersion performance of excessive modified alumina in the system, resulting in agglomeration in the system and affecting the overall stability of the system. Therefore, the comprehensive performance of Examples 8 and 9 both decreases.

[0055] In the bamboo fiber composite material of Example 10, the bamboo fibers were not modified. It is difficult to further improve the bonding performance among the various components in the system with unmodified bamboo fibers, and the connection stability of the system decreased, so the strength of Example 10 decreased.

[0056] In the bamboo fiber composite material of Example 11, the alumina was not modified. It is difficult to further improve the dispersion performance of unmodified alumina, and it agglomerated in the system, affecting the overall stability of the system, so the performance of Example 11 decreased.

[0057] In Example 12, when preparing the bio-based filler, 3-chloro-2-hydroxypropyltrimethylammonium chloride was not added, and the lignin was not modified. It is difficult to further improve the stability of unmodified lignin, and it is also difficult to further improve the loading performance for silver nanoparticles, so the performance of Example 12 decreased.

[0058] In Example 13, when preparing the bio-based filler, silver nanoparticles were not added. It is difficult to further improve the antibacterial performance of the lignin complex without silver nanoparticles, and it is also difficult to further improve the overall strength of the system, so the performance of Example 13 decreased.

[0059] In Comparative Example 1, the bamboo fiber composite material was replaced with ordinary bamboo fibers. In Comparative Example 2, the lignin complex was replaced with an equal amount of lignin. It is difficult to further improve the overall performance of the system with only ordinary bamboo fibers or ordinary lignin, so the performance of both Comparative Example 1 and Comparative Example 2 decreased.

[0060] This specific embodiment is only an interpretation of the present application and is not a limitation thereof. Through the above description, relevant staff can make various changes and modifications without departing from the technical idea of this application. The technical scope of this application is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A bio-based TPE thermoelastic material, characterized in that: The composition comprises the following components in parts by weight: Bio-based SEBS 50-100 parts, white oil 50-100 parts, bio-based raw materials 100-200 parts, bio-based fillers 50-100 parts, anti-UV agent 5-10 parts, antioxidant 5-10 parts; The bio-based raw materials include any one or more mixtures of bio-based PE, bio-based EVA, bio-based TPU, and bio-based POE; The bio-based filler comprises a bamboo fiber composite material and a lignin composite material, and the lignin composite material comprises lignin, 3-2-hydroxypropyltrimethylammonium chloride and nano-silver.

2. The bio-based TPE thermoelastic material according to claim 1, characterized in that: The lignin composite is prepared by the following method: The lignin is mixed with water to obtain a lignin solution, a sodium hydroxide solution is used to adjust the lignin solution to alkalinity, the temperature is increased, 3-chloro-2-hydroxypropyltrimethylammonium chloride is added, and the sodium hydroxide solution is used to maintain the alkalinity, after the reaction, the solution is cooled and dialyzed, and then freeze-dried to obtain amphoteric lignin; the prepared amphoteric lignin and nanosilver particles are mixed with anhydrous ethanol to obtain a mixed solution, and then the mixed solution is centrifuged to separate the solid phase and the liquid phase, the solid phase is washed and centrifuged again, and freeze-dried to obtain a lignin complex.

3. The bio-based TPE thermoelastic material according to claim 2, characterized in that: The mass ratio of the 3-chloro-2-hydroxypropyltrimethylammonium chloride, lignin and nano-silver is (1.7-1.9):1:2.

4.

4. The bio-based TPE thermoelastic material according to claim 1, characterized in that: The bamboo fiber composite material comprises bamboo fiber, dopamine and modified aluminum oxide.

5. The bio-based TPE thermoelastic material according to claim 4, characterized in that: The modified alumina is prepared by the following method: Anhydrous ethanol and citric acid solution are mixed, and then silane coupling agent KH-560 is added, magnetic stirring is performed, and the mixture is allowed to stand to obtain a silane coupling agent solution. Nano-alumina is added to the silane coupling agent solution, magnetic stirring is performed, and then the mixture is heated in a water bath, and magnetic stirring is continued. After cooling, the supernatant is poured out, separated by suction filtration, washed, and vacuum dried to obtain modified alumina.

6. The bio-based TPE thermoelastic material according to claim 5, characterized in that: The mass concentration of KH-560 in the silane coupling agent solution is 1.9-2.1%.

7. The bio-based TPE thermoelastic material according to claim 4, characterized in that: The bamboo fiber composite material is prepared by the following method: Deionized water and Tris buffer are mixed to obtain a Tris solution, dopamine hydrochloride is added to the Tris solution, and the mixture is stirred to obtain a dopamine dispersion, bamboo fibers are immersed in the dopamine dispersion, filtered and washed, and then dried to obtain modified bamboo fibers, and the modified bamboo fibers, modified alumina and polyethylene terephthalate are mixed to obtain a bamboo fiber composite material.

8. The bio-based TPE thermoelastic material according to claim 7, characterized in that: The mass ratio of the modified bamboo fiber, modified alumina and polyethylene terephthalate is 1:(0.06-0.1):2.

2.

9. The bio-based TPE thermoelastic material according to claim 1, characterized in that: The mass ratio between the bamboo fiber composite material and the lignin composite material is (1.4-1.6):1.

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