Solid tire rubber composition prepared from waste rubber, mixing method and prepared solid tire

Abstract

The invention relates to the technical field of tire manufacturing, in particular to a solid tire rubber composition prepared from waste rubber, a mixing method and a prepared solid tire. Through an efficient desulfurization technology, a compound chemical additive system and reasonable formula design, efficient regeneration of the waste rubber and preparation of the high-performance solid tire are achieved, the utilization rate of the waste rubber is increased, the production cost is reduced, the mechanical property and durability of the solid tire are greatly improved, and the solid tire is suitable for large-scale popularization and application. The method has remarkable economic benefits and environmental protection benefits.

Description

Technical Field

[0001] The invention relates to the technical field of tire manufacturing, and in particular to a solid tire rubber material composition prepared from waste rubber, a mixing method and the prepared solid tire. Background Art

[0002] With the rapid development of the automobile industry and industrial vehicles, rubber products, especially tires, have been widely used in modern transportation. However, the generation and accumulation of waste tires has become a global environmental problem. Due to their vulcanized cross-linked structure, waste tires are difficult to degrade. Traditional treatment methods such as incineration and landfill not only waste resources, but also cause serious pollution to the environment. Therefore, the recycling of waste rubber has become a technical problem that needs to be solved urgently.

[0003] At present, the recycling technology of waste rubber mainly focuses on mechanical crushing, pyrolysis, chemical degradation, etc., but these methods have defects such as low processing efficiency, high energy consumption, and poor material performance. Especially in the recycling process of high-performance rubber products, it is difficult to meet the actual application needs. Therefore, how to effectively destroy the vulcanization cross-linking bonds in waste rubber and maintain its physical properties while combining well with new rubber materials is the key to improving the performance of recycled rubber.

[0004] In recent years, high shear mechanical desulfurization technology has been gradually applied to the regeneration of waste rubber. Through the synergistic effect of high shear force and chemical additives, it can effectively destroy the cross-linking structure in waste rubber, restore the plasticity of rubber, and maintain the integrity of rubber molecular chains during the desulfurization process. This technology not only improves the regeneration efficiency of waste rubber, but also reduces the use of chemical reagents and reduces environmental pollution. At the same time, by rationally designing compound chemical desulfurization additives, the desulfurization efficiency and the performance of recycled rubber can be further improved, especially in the preparation of high-strength, wear-resistant solid tire rubber compositions.

[0005] Solid tires are widely used in heavy equipment such as forklifts and engineering vehicles, and require high strength, wear resistance and excellent durability. In the traditional solid tire preparation process, new rubber materials are usually used, resulting in high production costs and waste of resources for the environment. Summary of the invention

[0006] In order to solve the above-mentioned technical problems, the purpose of the present invention is to provide a solid tire rubber composition prepared from waste rubber, which can effectively improve the recycling rate of waste rubber, reduce the production cost of solid tires, and provide high-performance, environmentally friendly solid tire products, meeting the dual requirements of the modern rubber products industry for environmental protection and performance.

[0007] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions: A solid tire rubber composition prepared from waste rubber, wherein the rubber composition is prepared by mixing the following raw materials based on 100 parts by total weight of the rubber: Devulcanization of waste rubber: 40-70 parts; Natural rubber or synthetic rubber: 30-60 parts; Reinforcing filler: 30-50 parts; Accelerator: 0.5-2.0 parts; Sulfur: 1.0-2.5 parts; Antioxidant: 0.5-2.0 parts; The desulfurization waste rubber is treated by high shear mechanical desulfurization equipment, and the mechanical desulfurization treatment is carried out under the conditions of a shear rate of 500-1500rpm, a temperature of 140-180°C, and a pressure of 2-5 MPa, and the treatment time is 15-30 minutes; a compound chemical desulfurization aid is added during the treatment, and the compound chemical desulfurization aid includes, based on 100 parts of the waste rubber, 1-butyl-3-methylimidazole hexafluorophosphate: 1.0-2.0 phr; chemical desulfurizer: 1.0-3.0 phr; plasticizer: 2.0-4.0 phr; compatibilizer: 0.5-1.5 phr.

[0008] The waste rubber described in the present invention mainly includes waste automobile tires, waste engineering vehicle tires, conveyor belts, and scraps and waste generated in the production process of rubber products.

[0009] Preferably, the high shear mechanical desulfurization equipment is a twin-screw extruder or a high shear internal mixer.

[0010] Preferably, the chemical desulfurizer is a combination of dibenzothiazole disulfide and a thiol compound; preferably, the thiol compound includes a mixture of one or more of thioglycolic acid, dipropionic acid disulfide, 2-mercaptoethanol, mercaptoethylamine, thioacetamide and mercaptobenzothiazole.

[0011] Preferably, the plasticizer is epoxidized vegetable oil or a citrate plasticizer; preferably, the citrate plasticizer is selected from one or a mixture of triethyl citrate, triethyl acetyl citrate, tributyl citrate, acetyl tributyl citrate, triisononyl citrate, tri(2-ethylhexyl) citrate, and triisooctyl citrate.

[0012] Preferably, the compatibilizer is one or more of a silane coupling agent, a titanate coupling agent, and a zirconate coupling agent; preferably, the compatibilizer is a silane coupling agent Si69.

[0013] Preferably, the reinforcing filler is a mixture of one or more of carbon black or white carbon black.

[0014] Preferably, the antioxidant is N-isopropyl-N'-phenyl-p-phenylenediamine (IPPD), and the accelerator is accelerator CZ.

[0015] Furthermore, the present invention also discloses a mixing method of the solid tire rubber composition, which comprises the following steps: a) Adding waste rubber and compound chemical desulfurization aid into high shear mechanical desulfurization equipment for mechanical desulfurization treatment, the desulfurization conditions are temperature 140-180°C, shear rate 500-1500 rpm, pressure 2-5 MPa, and time 15-30 minutes; b) Mix the desulfurized waste rubber with new rubber in a ratio of 40-60%, and add reinforcing fillers, accelerators, sulfur and antioxidants; c) mixing in an internal mixer at a mixing temperature of 140-160°C for 5-10 minutes; d) Extruding and tableting to obtain the solid tire rubber composition.

[0016] Furthermore, the present invention also discloses the use of the solid tire rubber composition in preparing a high-strength, wear-resistant and environmentally friendly solid tire.

[0017] Furthermore, the present invention also discloses a solid tire, which is prepared by vulcanizing the solid tire rubber composition.

[0018] The present invention adopts the above technical solution, through efficient desulfurization technology, compound chemical auxiliary agent system and reasonable formula design, to achieve efficient regeneration of waste rubber and preparation of high-performance solid tires, which not only improves the utilization rate of waste rubber and reduces production costs, but also greatly improves the mechanical properties and durability of solid tires, and has significant economic and environmental benefits. Specifically, it has the following significant technical effects: 1. Efficient desulfurization, improving the regeneration performance of waste rubber: Through high-shear mechanical desulfurization technology combined with compound chemical desulfurization additives, the vulcanization cross-linking bonds in waste rubber are effectively destroyed to restore its plasticity. Compared with traditional chemical or mechanical treatment methods, the present invention achieves efficient desulfurization under mild conditions (temperature 140-180°C, shear rate 500-1500 rpm), reduces energy consumption and the use of chemicals, and significantly improves the recycling effect of waste rubber.

[0019] 2. Synergistic effect of compound chemical desulfurization aid: The compound chemical desulfurization aid in the present invention includes 1-butyl-3-methylimidazolium hexafluorophosphate, chemical desulfurizer, plasticizer and compatibilizer, which further improves the desulfurization efficiency through synergistic effect. In particular, 1-butyl-3-methylimidazolium hexafluorophosphate can not only effectively break the vulcanization cross-linking bonds of rubber, but also improve the compatibility of waste rubber and new rubber, ensuring the uniformity and processing performance of the mixed rubber.

[0020] 3. Enhance compatibility and improve mechanical properties: The present invention effectively improves the compatibility of waste rubber and new rubber (such as natural rubber or synthetic rubber) during the mixing process by adding a compatibilizer (such as silane coupling agent Si69), ensuring the uniform combination of waste rubber and new rubber materials, avoiding the phenomenon of mutual stratification or uneven mixing of rubber, and further improving the mechanical properties of the final product.

[0021] 4. Significant environmental benefits: The present invention reduces dependence on new rubber and reduces resource consumption in the production process of rubber products by recycling waste rubber. At the same time, the compound chemical additive system used has green and environmentally friendly characteristics, reduces pollution to the environment, and meets the environmental protection requirements of modern industry.

[0022] 5. Reduce production costs: Due to the use of a large amount of waste rubber as raw material, combined with efficient desulfurization treatment, the preparation method of the present invention can significantly reduce the production cost of solid tires, while ensuring the high performance of recycled rubber through reasonable formula design. This provides an economical and efficient solution for the production of solid tires.

[0023] 6. Widely used in high-load solid tires: The solid tire rubber composition prepared by the present invention is suitable for high-load working conditions such as forklifts and engineering vehicles, meeting their requirements for high strength, wear resistance and long service life. The prepared solid tire not only has excellent mechanical properties and durability, but also has good anti-aging performance and long service life.

[0024] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] Example 1 1. Recipe: Devulcanized waste rubber: 50 parts Natural rubber: 50 parts Carbon black N330: 40 parts Accelerator CZ: 1.0 part Sulfur: 2.0 parts Antioxidant IPPD: 1.0 part.

[0026] Compound chemical desulfurization additive: 1-Butyl-3-methylimidazolium hexafluorophosphate: 1.5 parts Dibenzothiazyl disulfide (MBTS): 1.5 parts Epoxidized vegetable oil: 3.0 parts Silane coupling agent Si69: 1.0 part.

[0027] 2. Preparation process: 1) Pretreatment of waste rubber: The waste tire rubber is cleaned and crushed. The particle size of the crushed rubber particles is 5-6 mm.

[0028] 2) Add the waste rubber into a twin-screw extruder, add a compound chemical desulfurization aid, and carry out high shear mechanical desulfurization for 20 minutes at 150°C, a shear rate of 1000 rpm, and a pressure of 3 MPa.

[0029] 3) The devulcanized rubber was mixed with natural rubber in a ratio of 50:50, carbon black, accelerator, sulfur and antioxidant were added, and mixed in an internal mixer at 150°C for 7 minutes.

[0030] 4) The mixed rubber compound was vulcanized at 155°C for 30 minutes to prepare a solid tire rubber compound sample.

[0031] Example 2 1. Recipe: Devulcanization of waste rubber: 60 parts Natural rubber: 40 parts Carbon black N330: 45 parts Accelerator CZ: 1.5 parts Sulfur: 2.2 parts Antioxidant IPPD: 1.5 parts.

[0032] Compound chemical desulfurization additive: 1-Butyl-3-methylimidazolium hexafluorophosphate: 1.0 part 2-Mercaptoethanol: 2.0 parts Tributyl citrate: 2.5 parts Silane coupling agent Si69: 1.0 part.

[0033] 2. Preparation process: 1) Pretreatment of waste rubber: The waste tire rubber is cleaned and crushed. The particle size of the crushed rubber particles is 5-6 mm.

[0034] 2) Add the waste rubber into a twin-screw extruder, add a compound chemical desulfurization aid, and carry out high shear mechanical desulfurization for 20 minutes at 150°C, a shear rate of 1200 rpm, and a pressure of 3 MPa.

[0035] 3) The devulcanized rubber was mixed with natural rubber in a ratio of 60:40, carbon black, accelerator, sulfur and antioxidant were added, and mixed in an internal mixer at 150°C for 7 minutes.

[0036] 4) The mixed rubber compound was vulcanized at 155°C for 30 minutes to prepare a solid tire rubber compound sample.

[0037] Example 3 1. Recipe: Devulcanized waste rubber: 45 parts Natural rubber: 55 parts Carbon black N330: 35 parts Accelerator CZ: 1.0 part Sulfur: 1.8 parts Antioxidant IPPD: 1.0 part.

[0038] Compound chemical desulfurization additive: 1-Butyl-3-methylimidazolium hexafluorophosphate: 1.5 parts Mercaptoethylamine: 1.5 parts Triethylhexyl citrate: 3.0 parts Silane coupling agent Si69: 1.2 parts.

[0039] 2. Preparation process: 1) Pretreatment of waste rubber: The waste tire rubber is cleaned and crushed. The particle size of the crushed rubber particles is 5-6 mm.

[0040] 2) Add the waste rubber into a twin-screw extruder, add a compound chemical desulfurization aid, and carry out high shear mechanical desulfurization for 25 minutes at 160°C, a shear rate of 1500 rpm, and a pressure of 3 MPa.

[0041] 3) The devulcanized rubber was mixed with natural rubber in a ratio of 45:55, carbon black, accelerator, sulfur and antioxidant were added, and the mixture was mixed in an internal mixer at 150°C for 7 minutes.

[0042] 4) The mixed rubber compound was vulcanized at 155°C for 30 minutes to prepare a solid tire rubber compound sample.

[0043] Comparative Example 1 1. Recipe: Devulcanized waste rubber: 50 parts Natural rubber: 50 parts Carbon black N330: 40 parts Accelerator CZ: 1.0 part Sulfur: 2.0 parts Antioxidant IPPD: 1.0 part.

[0044] Chemical desulfurization additives: MBTS: 2.0 phr Epoxidized vegetable oil: 3.0phr Silane coupling agent Si69: 1.0phr.

[0045] 2. Preparation process: 1) Pretreatment of waste rubber: The waste tire rubber is cleaned and crushed. The particle size of the crushed rubber particles is 5-6 mm.

[0046] 2) The waste rubber was added into a twin-screw extruder, a chemical desulfurization aid was added, and mechanical desulfurization was carried out for 30 minutes at 160 °C, a shear rate of 1000 rpm, and a pressure of 3 MPa.

[0047] 3) The devulcanized rubber was mixed with natural rubber in a ratio of 50:50, carbon black, accelerator, sulfur and antioxidant were added, and mixed in an internal mixer at 150°C for 7 minutes.

[0048] The vulcanization conditions are the same as those in Example 1.

[0049] Comparative Example 2 1. Recipe: Devulcanized waste rubber: 50 parts Natural rubber: 50 parts Carbon black N330: 40 parts Accelerator CZ: 1.0 part Sulfur: 2.0 parts Antioxidant IPPD: 1.0 part.

[0050] Chemical desulfurization additives: 1-Butyl-3-methylimidazolium hexafluorophosphate: 1.2 phr.

[0051] 2. Preparation process: 1) Pretreatment of waste rubber: The waste tire rubber is cleaned and crushed. The particle size of the crushed rubber particles is 5-6 mm.

[0052] 2) The waste rubber was added into a twin-screw extruder, a chemical desulfurization aid was added, and mechanical desulfurization was carried out for 30 minutes at 160 °C, a shear rate of 1000 rpm, and a pressure of 3 MPa.

[0053] 3) The devulcanized rubber was mixed with natural rubber in a ratio of 50:50, carbon black, accelerator, sulfur and antioxidant were added, and mixed in an internal mixer at 150°C for 7 minutes.

[0054] 4) The vulcanization conditions are the same as those in Example 1.

[0055] Comparative Example 3 1. Recipe: Devulcanized waste rubber: 50 parts Natural rubber: 50 parts Carbon black N330: 40 parts Accelerator CZ: 1.0 part Sulfur: 2.0 parts Antioxidant IPPD: 1.0 portion Compound chemical desulfurization additive: 1-Butyl-3-methylimidazolium hexafluorophosphate: 1.5 parts Dibenzothiazyl disulfide (MBTS): 1.5 parts Epoxidized vegetable oil: 3.0 parts.

[0056] 2. Preparation process: 1) Pretreatment of waste rubber: The waste tire rubber is cleaned and crushed. The particle size of the crushed rubber particles is 5-6 mm.

[0057] 2) The waste rubber was added into a twin-screw extruder, a chemical desulfurization aid was added, and mechanical desulfurization was carried out for 30 minutes at 160 °C, a shear rate of 1000 rpm, and a pressure of 3 MPa.

[0058] 3) The devulcanized rubber was mixed with natural rubber in a ratio of 50:50, carbon black, accelerator, sulfur and antioxidant were added, and mixed in an internal mixer at 150°C for 7 minutes.

[0059] 4) The vulcanization conditions are the same as those in Example 1.

[0060] Comparative Example 4 1. Recipe: Devulcanized waste rubber: 50 parts Natural rubber: 50 parts Carbon black N330: 40 parts Accelerator CZ: 1.0 part Sulfur: 2.0 parts Antioxidant IPPD: 1.0 portion 2. Preparation process: The waste rubber was subjected to high-temperature mechanical desulfurization without chemical desulfurization aids. The temperature was set at 180 °C, the shear rate was 1000 rpm, and the desulfurization time was 30 minutes.

[0061] The other steps are the same as in Example 1.

[0062] The performance test data based on the above embodiments and comparative examples are used to prove the technical effects of the present invention: Table 1 Experimental results comparison data table Example / Comparative Example Tensile strength(MPa) Tear strength (kN / m) Elongation at break (%) Hardness (Shore A) Aging resistance (change rate %) Wear resistance (volume loss mm³) Example 1 14.0 30 380 60 7.0 125 Example 2 14.5 32 385 61 6.5 122 Example 3 15.0 35 390 62 6.0 118 Comparative Example 1 12.0 28 350 58 10.5 135 Comparative Example 2 13.0 29 365 59 9.0 132 Comparative Example 3 13.5 31 372 60 8.2 128 Comparative Example 4 11.5 27 340 57 11.0 140 Result analysis: 1. Tensile strength The tensile strengths of Examples 1-3 are 14.0 MPa, 14.5 MPa and 15.0 MPa, respectively, which are significantly higher than the 11.5 MPa to 13.5 MPa of Comparative Examples 1-4. Comparative Examples 1 and 4 have the lowest tensile strengths, 12.0 MPa and 11.5 MPa, respectively, which indicates that the solid tire rubber material that has not been fully optimized has deficiencies in tensile properties. The higher tensile strength of the embodiment indicates that through appropriate process optimization (such as the use of compounded chemical additives), the solid tire material can obtain higher tensile properties, making it more suitable for application scenarios that require stronger mechanical strength.

[0063] 2. Tear strength The tear strengths of Examples 1-3 are 30-35 kN / m, respectively, which are significantly better than the 27-31 kN / m of the comparative examples. The tear strengths of Comparative Examples 1 and 4 are the lowest, 28 kN / m and 27 kN / m, respectively, indicating that these materials are prone to tearing in actual use. The tear strength in the examples is significantly improved, indicating that after reasonable optimization of the desulfurization and mixing processes, the bonding force between rubber molecules has been enhanced, and the tear strength has also been improved accordingly.

[0064] 3. Elongation at break The elongation at break of Examples 1-3 is 380%, 385% and 390%, respectively, which is higher than 340%-372% of the comparative examples. The elongation at break of Comparative Examples 1 and 4 is the lowest, which is 350% and 340%, respectively, indicating that the flexibility and ductility of these materials are poor. The elongation at break of the embodiment is good, indicating that after reasonable formula design and process control, the flexibility of the solid tire material has been optimized and adapted to more complex application environments.

[0065] 4. Hardness (Shore A) The hardness of Examples 1-3 is 60-62 Shore A, which is slightly higher than the hardness of the comparative example (57-60 Shore A), showing better strength and load-bearing capacity. Comparative Examples 1 and 4 have the lowest hardness, 58 and 57 Shore A, respectively, which indicates that the rubber compound that is not fully optimized may lack sufficient strength in a high-pressure environment. The hardness of the embodiment is moderate, which not only retains a high strength, but also does not affect the elasticity and toughness of the material.

[0066] 5. Aging resistance The aging resistance change rates of Examples 1-3 are 7.0%, 6.5% and 6.0%, respectively, which are significantly better than the 8.2%-11.0% of the comparative examples. The aging resistance of Comparative Examples 1 and 4 is the worst, with change rates of 10.5% and 11.0%, respectively, indicating that these materials are prone to aging and performance degradation in long-term use. The aging performance of the embodiment is better, which means that the optimized rubber compound is more stable in long-term use and is suitable for solid tire applications that require a longer life.

[0067] 6. Wear resistance The wear resistance of Examples 1-3 is 125 mm³, 122 mm³ and 118 mm³, respectively, which is significantly better than the 128-140 mm³ of the comparative examples. The wear resistance of Comparative Examples 1 and 4 is the worst, with volume losses of 135 mm³ and 140 mm³, respectively, indicating that these materials have poor wear resistance in frequent use and high wear situations. The wear resistance of the embodiment is better and the volume loss is lower, proving that it is suitable for use in high wear environments and prolongs the service life of the solid tire.

[0068] It can be seen from the experimental results that the compounded chemical desulfurization aid in the present invention, especially 1-butyl-3-methylimidazolium hexafluorophosphate, synergistically with chemical desulfurization aids (such as MBTS, mercaptoethanol) and compatibilizer (Si69), significantly improves the desulfurization efficiency of waste rubber and the mechanical properties and wear resistance of recycled rubber. These properties are crucial for manufacturing high-strength, wear-resistant and long-life solid tires. In the comparative experiment, the formula without compounded chemical aids or compatibilizers has significantly decreased performance, proving that the technical effect of the present invention has significant advantages.

[0069] The above is a description of the embodiments of the present invention. Through the above description of the disclosed embodiments, professionals and technicians in the field can implement or use the present invention. Various modifications to these embodiments will be apparent to professionals and technicians in the field. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown in this article, but will conform to the widest range consistent with the principles and novelties disclosed herein.

Claims

1. A solid tire rubber composition prepared from waste rubber, characterized in that: The rubber composition is prepared by mixing the following raw materials based on 100 parts by total weight of the rubber: Devulcanization of waste rubber: 40-70 parts; Natural rubber or synthetic rubber: 30-60 parts; Reinforcing filler: 30-50 parts; Accelerator: 0.5-2.0 parts; Sulfur: 1.0-2.5 parts; Antioxidant: 0.5-2.0 parts; The desulfurization treatment of the waste rubber is carried out by high shear mechanical desulfurization equipment, and the mechanical desulfurization treatment is carried out under the conditions of a shear rate of 500-1500 rpm, a temperature of 140-180°C, and a pressure of 2-5 MPa, and the treatment time is 15-30 minutes; A compound chemical desulfurization aid is added during the treatment, and the compound chemical desulfurization aid includes, based on 100 parts of waste rubber, 1-butyl-3-methylimidazolium hexafluorophosphate: 1.0-2.0 phr; chemical desulfurizer: 1.0-3.0 phr; plasticizer: 2.0-4.0 phr; compatibilizer: 0.5-1.5 phr.

2. The solid tire rubber composition according to claim 1, characterized in that: The high shear mechanical desulfurization equipment is a twin-screw extruder or a high shear internal mixer.

3. The solid tire rubber composition according to claim 1 or 2, characterized in that: The chemical desulfurizer is a combination of dibenzothiazole disulfide and a thiol compound; preferably, the thiol compound includes a mixture of one or more of thioglycolic acid, dipropionic acid disulfide, 2-mercaptoethanol, mercaptoethylamine, thioacetamide and mercaptobenzothiazole.

4. The solid tire rubber composition according to claim 1, characterized in that: The plasticizer is epoxidized vegetable oil or a citrate plasticizer; preferably, the citrate plasticizer is selected from one or a mixture of triethyl citrate, triethyl acetyl citrate, tributyl citrate, acetyl tributyl citrate, triisononyl citrate, tri(2-ethylhexyl) citrate, and triisooctyl citrate.

5. The solid tire rubber composition according to claim 1, characterized in that: The compatibilizer is one or more of a silane coupling agent, a titanate coupling agent, and a zirconate coupling agent; preferably, the compatibilizer is a silane coupling agent Si69.

6. The solid tire rubber composition according to claim 1, characterized in that: The reinforcing filler is a mixture of one or more of carbon black or white carbon black.

7. The solid tire rubber composition according to claim 1, characterized in that: The antioxidant is N-isopropyl-N'-phenyl-p-phenylenediamine (IPPD), and the accelerator is accelerator CZ.

8. The method for mixing a solid tire rubber composition according to any one of claims 1 to 7, characterized in that: The method comprises the following steps: a) Adding waste rubber and compound chemical desulfurization aid into high shear mechanical desulfurization equipment for mechanical desulfurization treatment, the desulfurization conditions are temperature 140-180°C, shear rate 500-1500 rpm, pressure 2-5 MPa, and time 15-30 minutes; b) Mix the desulfurized waste rubber with new rubber in a ratio of 40-60%, and add reinforcing fillers, accelerators, sulfur and antioxidants; c) mixing in an internal mixer at a mixing temperature of 140-160°C for 5-10 minutes; d) Extruding and tableting to obtain the solid tire rubber composition.

9. Use of the solid tire rubber composition according to any one of claims 1 to 7 in the preparation of high-strength, wear-resistant and environmentally friendly solid tires.

10. A solid tire, characterized in that: The solid tire is prepared by vulcanizing the solid tire rubber composition described in any one of claims 1 to 7.