Thermoplastic elastomer with low compression set properties and method of making

Abstract

The application discloses a thermoplastic elastomer with low compression permanent deformation characteristics, which comprises the following raw materials in parts by weight: 45-55 parts of hydrogenated polystyrene-butadiene-styrene block copolymer, 25-30 parts of polystyrene, 2-6 parts of vulcanizing agent, 3-6 parts of hydroxyl silicone oil, 2-5 parts of auxiliary oil, 5-7 parts of filler and 1-2 parts of antioxidant. The thermoplastic elastomer uses the hydrogenated polystyrene-butadiene-styrene block copolymer and polystyrene as the base material, and adds vulcanizing agent, hydroxyl silicone oil and auxiliary oil to enhance the functional effect of the product and improve the low compression permanent deformation characteristic performance of the product.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of thermoplastic elastomers, in particular to a thermoplastic elastomer with low compression set property and a preparation method. BACKGROUND

[0002] Thermoplastic elastomer refers to a kind of elastomer material with the elasticity of rubber at room temperature and plastic forming at high temperature. Thermoplastic elastomer can be repeatedly processed and recycled using similar processing technology of thermoplastic resin.

[0003] The existing thermoplastic elastomer improves the low compression set property, but the strength and elongation at break performance decrease. Therefore, the present application improves the coordination of the thermoplastic elastomer with low compression set property and the preparation method. SUMMARY

[0004] In view of the defects of the prior art, the present application aims to provide a thermoplastic elastomer with low compression set property and a preparation method to solve the problems in the background art.

[0005] The technical problem of the present application is solved by the following technical scheme:

[0006] The present application provides a thermoplastic elastomer with low compression set property, comprising the following raw materials by weight:

[0007] Hydrogenated polystyrene-butadiene-styrene block copolymer 45-55 parts, polystyrene 25-30 parts, vulcanizing agent 2-6 parts, hydroxyl silicone oil 3-6 parts, auxiliary oil 2-5 parts, filler 5-7 parts and antioxidant 1-2 parts.

[0008] Preferably, the hydrogenated polystyrene-butadiene-styrene block copolymer is styrene-ethylene-ethylene / propylene-styrene block copolymer.

[0009] Preferably, the thermoplastic elastomer further comprises 5-10 parts by weight of nano-silica modifier, 1-3 parts of chitosan liquid modified calcium sulfate whisker composite.

[0010] Preferably, the preparation method of the nano-silica modifier is as follows:

[0011] S01: 4-7 parts of nano-silicon oxide are first sent into 10-15 parts of sodium alginate aqueous solution and treated for 15-25 min at a standing temperature of 55-65℃, and then washed with water and dried after standing;

[0012] S02: then heat treated at 210-220℃ for 10-20 min, and then reduced to room temperature at a rate of 1-3℃ / min after treatment;

[0013] S03: Finally, the mixture is sent to a ball mill for 10-20 minutes at a rotation speed of 1000-1500 r / min, and then the nano-silica modifier is obtained.

[0014] Preferably, the mass fraction of the sodium alginate aqueous solution is 10-15%.

[0015] Preferably, the preparation method of the chitosan liquid modified calcium sulfate whisker composite is as follows:

[0016] S101: The bentonite is sent to 5-10 times of deionized water for ultrasonic dispersion until the bentonite is fully dispersed, and the ultrasonic power is 500-1000 W and the ultrasonic time is 5-10 minutes, so that the dispersed bentonite is obtained;

[0017] S102: 5-10 parts of the dispersed bentonite is added to 20-30 parts of the chitosan aqueous solution, and then 1-3 parts of sodium dodecyl sulfate and 2-4 parts of the coupling agent KH560 are added, and the mixture is stirred uniformly to obtain a chitosan compound liquid;

[0018] S103: The calcium sulfate whisker is first placed in a mixed acid solution for pre-stirring modification, and then washed with water and dried;

[0019] S104: The product of S103 is added to the product of S102 according to a weight ratio of 1:5, and the mixture is stirred uniformly, and then washed with water and dried, so that the chitosan liquid modified calcium sulfate whisker composite is obtained.

[0020] Preferably, the mass fraction of the chitosan aqueous solution is 10-20%.

[0021] Preferably, the mixed acid solution is a mixture of a hydrogen peroxide solution with a mass fraction of 2-5% and a hydrochloric acid solution with a mass fraction of 1-3% according to a weight ratio of 1:3.

[0022] Preferably, the filler is one or more of a combination of talc, calcium carbonate and clay, the auxiliary oil is one or more of soybean oil, cotton oil and palm oil, the antioxidant is antioxidant DLTP, and the vulcanizing agent is dicumyl peroxide.

[0023] The application further provides a preparation method of a thermoplastic elastomer with low compression permanent deformation characteristics, which comprises the following steps: raw materials are sequentially and uniformly stirred and mixed, and then sent to an extruder for melting, extrusion and granulation, so that a thermoplastic elastomer material is obtained; wherein the length-diameter ratio of the double-screw extruder is greater than 56, the melting and blending extrusion temperature is 210-220 DEG C, and the rotation speed of the extruder is 350 r / min.

[0024] Compared with the prior art, the application has the following beneficial effects:

[0025] The thermoplastic elastomer of the present application is prepared by using hydrogenated polystyrene-butadiene-styrene block copolymer, polystyrene as the base material, adding vulcanizing agent, hydroxyl silicone oil, and auxiliary oil to enhance the functional effect of the product, improve the low compression permanent deformation performance of the product, and add the modified calcium sulfate whisker complex of nano-silicon dioxide modifier and chitosan liquid to coordinate the addition of the two, and the calcium sulfate whisker is arranged in the base material in the form of whisker structure, and through the optimization and modification, the low compression permanent deformation performance is improved, and the strength and elongation at break performance of the product are improved, and in addition, the product still has excellent performance stability under acid corrosion conditions. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described below in combination with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0027] The thermoplastic elastomer with low compression permanent deformation performance in the embodiment comprises the following raw materials by weight:

[0028] The hydrogenated polystyrene-butadiene-styrene block copolymer is 45-55 parts, the polystyrene is 25-30 parts, the vulcanizing agent is 2-6 parts, the hydroxyl silicone oil is 3-6 parts, the auxiliary oil is 2-5 parts, the filler is 5-7 parts, and the antioxidant is 1-2 parts.

[0029] The hydrogenated polystyrene-butadiene-styrene block copolymer in the embodiment is a styrene-ethylene-ethylene / propylene-styrene block copolymer.

[0030] The thermoplastic elastomer in the embodiment further comprises 5-10 parts by weight of nano-silicon dioxide modifier and 1-3 parts of chitosan liquid modified calcium sulfate whisker complex.

[0031] The preparation method of the nano-silicon dioxide modifier in the embodiment is as follows:

[0032] S01: 4-7 parts of nano-silicon dioxide are first sent into 10-15 parts of sodium alginate aqueous solution, and are left to stand for 15-25 min, the standing temperature is 55-65℃, after standing, water washing and drying are performed;

[0033] S02: then heat treatment is performed at 210-220℃ for 10-20 min, after treatment, the temperature is decreased to room temperature at a rate of 1-3℃ / min;

[0034] S03: Finally sent to the ball mill ball 10-20 min, ball mill speed of 1000-1500 r / min, ball mill end, get nano silica modifier.

[0035] The mass fraction of the sodium alginate aqueous solution of the embodiment is 10-15%.

[0036] The preparation method of the chitosan liquid modified calcium sulfate whisker composite of the embodiment is as follows:

[0037] S101: The bentonite is sent into 5-10 times of deionized water for ultrasonic dispersion, the ultrasonic power is 500-1000 W, and the ultrasonic time is 5-10 min, to obtain a dispersed bentonite;

[0038] S102: 5-10 parts of the dispersed bentonite is added into 20-30 parts of the chitosan aqueous solution, and then 1-3 parts of sodium dodecyl sulfate and 2-4 parts of the coupling agent KH560 are added, and the mixture is stirred uniformly to obtain a chitosan compound liquid;

[0039] S103: The calcium sulfate whisker is first placed in a mixed acid solution for pre-stirring modification, and then washed with water and dried;

[0040] S104: The product of S103 is added into the product of S102 according to a weight ratio of 1:5, and the mixture is stirred uniformly, and then washed with water and dried, to obtain a chitosan liquid modified calcium sulfate whisker composite.

[0041] The mass fraction of the chitosan aqueous solution of the embodiment is 10-20%.

[0042] The mixed acid solution of the embodiment is a hydrogen peroxide solution with a mass fraction of 2-5% and a hydrochloric acid solution with a mass fraction of 1-3%, which are stirred and mixed according to a weight ratio of 1:3.

[0043] The filler of the embodiment is one or a combination of more than one of talc, calcium carbonate and clay, the auxiliary oil is one or a combination of more than one of soybean oil, cotton oil and palm oil, the antioxidant is antioxidant DLTP, and the vulcanizing agent is dicumyl peroxide.

[0044] The preparation method of the thermoplastic elastomer with low compression permanent deformation property of the embodiment comprises the following steps: the raw materials are sequentially stirred and mixed uniformly, and then sent into an extruder for melting, extrusion and granulation, to obtain a thermoplastic elastomer material; wherein the length-diameter ratio of the double-screw extruder is greater than 56, the melt blending extrusion temperature is 210-220℃, and the rotation speed of the extruder is 350 r / min.

[0045] Embodiment 1

[0046] The thermoplastic elastomer with low compression permanent deformation property of the embodiment comprises the following raw materials by weight:

[0047] The mixture consists of 45 parts of hydrogenated polystyrene-butadiene-styrene block copolymer, 25 parts of polystyrene, 2 parts of vulcanizing agent, 3 parts of hydroxyl silicone oil, 2 parts of auxiliary oil, 5 parts of filler, and 1 part of antioxidant.

[0048] The hydrogenated polystyrene-butadiene-styrene block copolymer in this embodiment is a styrene-ethylene-ethylene / propylene-styrene block copolymer.

[0049] The thermoplastic elastomer of this embodiment also contains 5 parts by weight of nano-silica modifier and 1 part of chitosan solution-modified calcium sulfate whisker composite.

[0050] The preparation method of the nano-silica modifier in this embodiment is as follows:

[0051] S01: First, put 4 parts of nano-silica into a 10% sodium alginate aqueous solution and let it stand for 15 minutes at a standing temperature of 55℃. After standing, wash with water and dry.

[0052] S02: Then heat-treat at 210℃ for 10 min, and after treatment, cool to room temperature at a rate of 1℃ / min;

[0053] S03: Finally, it is fed into a ball mill and ball-milled for 10 minutes at a speed of 1000 r / min. After the ball milling is completed, nano-silica modifier is obtained.

[0054] The sodium alginate aqueous solution in this embodiment has a mass fraction of 10%.

[0055] The preparation method of the chitosan-modified calcium sulfate whisker composite in this embodiment is as follows:

[0056] S101: Bentonite is immersed in 5 times its volume of deionized water and ultrasonically dispersed thoroughly. The ultrasonic power is 500W and the ultrasonic time is 5min to obtain dispersed bentonite.

[0057] S102: 5 parts of dispersible bentonite were added to 20 parts of chitosan aqueous solution, then 1 part of sodium dodecyl sulfate and 2 parts of coupling agent KH560 were added and stirred evenly to obtain chitosan compound solution.

[0058] S103: Calcium sulfate whiskers are first placed in a mixed acid solution for pre-stirring and modification. After stirring thoroughly, they are then washed with water and dried.

[0059] S104: Add product S103 to product S102 at a weight ratio of 1:5, stir thoroughly, and finally wash and dry to obtain chitosan-modified calcium sulfate whisker composite.

[0060] In this embodiment, the chitosan aqueous solution has a mass fraction of 10%.

[0061] The mixed acid solution in this embodiment is prepared by mixing 2% hydrogen peroxide solution and 1% hydrochloric acid solution by weight in a ratio of 1:3.

[0062] In this embodiment, the filler is talc powder, the auxiliary oil is soybean oil, the antioxidant is DLTP, and the vulcanizing agent is dicumyl peroxide.

[0063] This embodiment describes a method for preparing a thermoplastic elastomer with low compression set characteristics, comprising the following steps: mixing raw materials sequentially until homogeneous, then feeding them into an extruder, and obtaining a thermoplastic elastomer material through melting, extrusion, and granulation in the extruder; wherein the twin-screw extruder has an aspect ratio greater than 56, a melt blending extrusion temperature of 210°C, and an extruder rotation speed of 350 r / min.

[0064] Example 2

[0065] This embodiment of a thermoplastic elastomer with low compression set characteristics comprises the following parts by weight of raw materials:

[0066] The mixture consists of 55 parts of hydrogenated polystyrene-butadiene-styrene block copolymer, 30 parts of polystyrene, 6 parts of vulcanizing agent, 6 parts of hydroxyl silicone oil, 5 parts of auxiliary oil, 7 parts of filler, and 2 parts of antioxidant.

[0067] The hydrogenated polystyrene-butadiene-styrene block copolymer in this embodiment is a styrene-ethylene-ethylene / propylene-styrene block copolymer.

[0068] The thermoplastic elastomer of this embodiment also contains 10 parts by weight of nano-silica modifier and 3 parts by weight of chitosan solution-modified calcium sulfate whisker composite.

[0069] The preparation method of the nano-silica modifier in this embodiment is as follows:

[0070] S01: First, put 7 parts of nano-silica into a 15% sodium alginate aqueous solution and let it stand for 25 minutes at a standing temperature of 65℃. After standing, wash with water and dry.

[0071] S02: Then heat-treat at 220℃ for 20 min, and after treatment, cool to room temperature at a rate of 3℃ / min;

[0072] S03: Finally, it is fed into a ball mill and ball-milled for 20 minutes at a speed of 1500 r / min. After the ball milling is completed, nano-silica modifier is obtained.

[0073] In this embodiment, the sodium alginate aqueous solution has a mass fraction of 15%.

[0074] The preparation method of the chitosan-modified calcium sulfate whisker composite in this embodiment is as follows:

[0075] S101: The bentonite is placed in 10 times its volume of deionized water and ultrasonically dispersed thoroughly. The ultrasonic power is 1000W and the ultrasonic time is 5-10 minutes to obtain dispersed bentonite.

[0076] S102: 10 parts of dispersible bentonite were added to 30 parts of chitosan aqueous solution, then 3 parts of sodium dodecyl sulfate and 4 parts of coupling agent KH560 were added and stirred evenly to obtain chitosan compound solution.

[0077] S103: Calcium sulfate whiskers are first placed in a mixed acid solution for pre-stirring and modification. After stirring thoroughly, they are then washed with water and dried.

[0078] S104: Add product S103 to product S102 at a weight ratio of 1:5, stir thoroughly, and finally wash and dry to obtain chitosan-modified calcium sulfate whisker composite.

[0079] In this embodiment, the chitosan aqueous solution has a mass fraction of 20%.

[0080] The mixed acid solution in this embodiment is prepared by mixing 5% hydrogen peroxide solution and 3% hydrochloric acid solution in a weight ratio of 1:3.

[0081] In this embodiment, the filler is talc powder, the auxiliary oil is soybean oil, the antioxidant is DLTP, and the vulcanizing agent is dicumyl peroxide.

[0082] This embodiment describes a method for preparing a thermoplastic elastomer with low compression set characteristics, comprising the following steps: mixing raw materials sequentially until homogeneous, then feeding them into an extruder, and obtaining a thermoplastic elastomer material through melting, extrusion, and granulation in the extruder; wherein the twin-screw extruder has an aspect ratio greater than 56, a melt blending extrusion temperature of 220°C, and an extruder rotation speed of 350 r / min.

[0083] Example 3

[0084] This embodiment of a thermoplastic elastomer with low compression set characteristics comprises the following parts by weight of raw materials:

[0085] The mixture contains 50 parts of hydrogenated polystyrene-butadiene-styrene block copolymer, 27 parts of polystyrene, 4 parts of vulcanizing agent, 4.5 parts of hydroxyl silicone oil, 3.5 parts of auxiliary oil, 6 parts of filler, and 1.5 parts of antioxidant.

[0086] The hydrogenated polystyrene-butadiene-styrene block copolymer in this embodiment is a styrene-ethylene-ethylene / propylene-styrene block copolymer.

[0087] The thermoplastic elastomer of this embodiment also contains 7.5 parts by weight of nano-silica modifier and 1-3 parts of chitosan solution-modified calcium sulfate whisker composite.

[0088] The preparation method of the nano-silica modifier in this embodiment is as follows:

[0089] S01: First, put 5 parts of nano-silica into a 12% sodium alginate aqueous solution and let it stand for 20 minutes at a standing temperature of 60℃. After standing, wash with water and dry.

[0090] S02: Then heat-treat at 215℃ for 15 min, and after treatment, cool to room temperature at a rate of 2℃ / min;

[0091] S03: Finally, it is fed into a ball mill and ball-milled for 15 minutes at a speed of 1250 r / min. After the ball milling is completed, nano-silica modifier is obtained.

[0092] The sodium alginate aqueous solution in this embodiment has a mass fraction of 12%.

[0093] The preparation method of the chitosan-modified calcium sulfate whisker composite in this embodiment is as follows:

[0094] S101: Bentonite is immersed in 7.5 times its volume of deionized water and ultrasonically dispersed thoroughly. The ultrasonic power is 750W and the ultrasonic time is 7.5min to obtain dispersed bentonite.

[0095] S102: 7.5 parts of dispersible bentonite were added to 25 parts of chitosan aqueous solution, then 2 parts of sodium dodecyl sulfate and 3 parts of coupling agent KH560 were added and stirred evenly to obtain chitosan compound solution;

[0096] S103: Calcium sulfate whiskers are first placed in a mixed acid solution for pre-stirring and modification. After stirring thoroughly, they are then washed with water and dried.

[0097] S104: Add product S103 to product S102 at a weight ratio of 1:5, stir thoroughly, and finally wash and dry to obtain chitosan-modified calcium sulfate whisker composite.

[0098] In this embodiment, the chitosan aqueous solution has a mass fraction of 15%.

[0099] The mixed acid solution in this embodiment is prepared by mixing 3.5% hydrogen peroxide solution and 2% hydrochloric acid solution in a weight ratio of 1:3.

[0100] In this embodiment, the filler is talc powder, the auxiliary oil is soybean oil, the antioxidant is DLTP, and the vulcanizing agent is dicumyl peroxide.

[0101] This embodiment describes a method for preparing a thermoplastic elastomer with low compression set characteristics, comprising the following steps: mixing raw materials sequentially until uniform, then feeding them into an extruder, and obtaining a thermoplastic elastomer material through melting, extrusion, and granulation in the extruder; wherein the twin-screw extruder has an aspect ratio greater than 56, a melt blending extrusion temperature of 215°C, and an extruder rotation speed of 350 r / min.

[0102] Comparative Example 1.

[0103] Unlike Optimized Example 3, no nano-silica modifier was added.

[0104] Comparative Example 2.

[0105] Unlike Optimized Example 3, the nano silica modifier is replaced with nano silica.

[0106] Comparative Example 3.

[0107] Unlike Optimized Example 3, the preparation method of the nano-silica modifier is different; the SO2 step was not used.

[0108] Comparative Example 4.

[0109] Unlike Optimized Example 3, this is a calcium sulfate whisker composite without chitosan solution modification.

[0110] Comparative Example 5.

[0111] Unlike Optimized Example 3, no dispersed bentonite was added in the preparation of the chitosan-modified calcium sulfate whisker composite.

[0112] Comparative Example 6.

[0113] Unlike Optimized Example 3, in the preparation of the chitosan-modified calcium sulfate whisker composite, calcium sulfate whiskers were replaced with aluminum borate whiskers.

[0114] Comparative Example 7.

[0115] Unlike Optimized Example 3, no chitosan compound solution was added in the preparation of the chitosan-modified calcium sulfate whisker composite.

[0116] Comparative Example 8.

[0117] Unlike Optimized Example 3, the chitosan compound solution did not contain the coupling agent KH560.

[0118] Comparative Example 9.

[0119] Unlike Optimized Example 3, the calcium sulfate whiskers were not treated with a mixed acid solution.

[0120] The performance measurement results of Examples 1-3 and Comparative Examples 1-9 are as follows:

[0121]

[0122]

[0123] Examples 1-3 and Comparative Examples 1-9 show that the tensile strength and elongation at break of the product of the present invention have a coordinated improvement effect, and the compression set at 70°C for 22 hours has excellent performance. In addition, the product has significant performance stability under acid corrosion conditions.

[0124] The performance of the calcium sulfate whisker composite without the addition of either nano-silica modifier or chitosan liquid modifier tends to deteriorate significantly. The combination of the two enhances the synergistic effect, improves the coordination between product performance, and optimizes the stability of the product under acidic conditions.

[0125] In the preparation of chitosan-modified calcium sulfate whisker composites, the performance of the products tended to deteriorate when no dispersed bentonite was added, no chitosan compound solution was added, or the composition of the chitosan compound solution was different, and the calcium sulfate whiskers were not treated with mixed acid solution. Only the chitosan-modified calcium sulfate whisker composite prepared by the method of this invention showed the most significant performance effect.

[0126] Meanwhile, in the preparation of chitosan-modified calcium sulfate whisker composites, the calcium sulfate whiskers used are replaced by other whiskers. The data shows that the product performance deteriorates more significantly under acidic conditions. Therefore, the raw materials used in the preparation of chitosan-modified calcium sulfate whisker composites are proprietary, and the product formulation and process are unique. Only products prepared using the process of this invention have the most significant performance effects.

[0127] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0128] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A thermoplastic elastomer with low compression set characteristics, characterized in that, Including the following parts by weight of raw materials: The thermoplastic elastomer comprises 45-55 parts hydrogenated polystyrene-butadiene-styrene block copolymer, 25-30 parts polystyrene, 2-6 parts vulcanizing agent, 3-6 parts hydroxyl silicone oil, 2-5 parts auxiliary oil, 5-7 parts filler, and 1-2 parts antioxidant; the thermoplastic elastomer further comprises 5-10 parts by weight of nano-silica modifier and 1-3 parts of chitosan solution-modified calcium sulfate whisker composite; the preparation method of the nano-silica modifier is as follows: S01: First, put 4-7 parts of nano-silica into 10-15 parts of sodium alginate aqueous solution and let it stand for 15-25 minutes at a standing temperature of 55-65℃. After standing, wash with water and dry. S02: Then heat-treat at 210-220℃ for 10-20 min. After treatment, cool to room temperature at a rate of 1-3℃ / min. S03: Finally, the mixture is fed into a ball mill and milled for 10-20 minutes at a speed of 1000-1500 r / min. After milling, the nano-silica modifier is obtained. The preparation method of the chitosan-modified calcium sulfate whisker composite is as follows: S101: The bentonite is immersed in 5-10 times its volume of deionized water and ultrasonically dispersed thoroughly. The ultrasonic power is 500-1000W and the ultrasonic time is 5-10min to obtain dispersed bentonite. S102: Add 5-10 parts of dispersible bentonite to 20-30 parts of chitosan aqueous solution, then add 1-3 parts of sodium dodecyl sulfate and 2-4 parts of coupling agent KH560, and stir evenly to obtain chitosan compound solution; S103: Calcium sulfate whiskers are first placed in a mixed acid solution for pre-stirring and modification. After stirring thoroughly, they are then washed with water and dried. S104: Add product S103 to product S102 at a weight ratio of 1:5, stir thoroughly, and finally wash and dry to obtain chitosan-modified calcium sulfate whisker composite.

2. The thermoplastic elastomer with low compression set characteristics according to claim 1, characterized in that, The hydrogenated polystyrene-butadiene-styrene block copolymer is a styrene-ethylene-ethylene / propylene-styrene block copolymer.

3. The thermoplastic elastomer with low compression set characteristics according to claim 1, characterized in that, The sodium alginate aqueous solution has a mass fraction of 10-15%.

4. The thermoplastic elastomer with low compression set characteristics according to claim 1, characterized in that, The chitosan aqueous solution has a mass fraction of 10-20%.

5. A thermoplastic elastomer with low compression set as described in claim 1, characterized in that, The mixed acid solution is prepared by mixing hydrogen peroxide solution (2-5% by mass) and hydrochloric acid solution (1-3% by mass) in a weight ratio of 1:

3.

6. The thermoplastic elastomer with low compression set according to claim 1, characterized in that, The filler is one or more of talc, calcium carbonate, and clay; the auxiliary oil is one or more of soybean oil, cottonseed oil, palm oil, and hydrocarbon-based biodiesel; the antioxidant is DLTP; and the vulcanizing agent is dicumyl peroxide.

7. The method for preparing a thermoplastic elastomer with low compression set as described in claim 1, characterized in that, Includes the following steps: The raw materials are stirred and mixed evenly in sequence, and then fed into an extruder. After melting, extrusion and granulation in the extruder, thermoplastic elastomer material is obtained. The twin-screw extruder has an aspect ratio greater than 56, a melt blending extrusion temperature of 210-220°C, and an extruder speed of 350 r / min.

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