Environment-friendly odorless high-strength devulcanized reclaimed rubber and preparation method thereof

Abstract

The application discloses an environment-friendly, odorless and high-strength devulcanized reclaimed rubber and a preparation method thereof, and belongs to the technical field of devulcanized reclaimed rubber. The structure is characterized in that, when the rubber powder is deodorized, the physical adsorption of odor and the degradation of odor molecules can be realized by adopting the synergistic process of the nano adsorption deodorization technology and the microwave molecular degradation technology. Under the action of microwaves, the nano adsorbent (montmorillonite nano reaction aid) after fusion can generate hydroxyl radicals on the surface of the rubber powder, thereby realizing the complete removal of odor. Moreover, the use of the modified montmorillonite nano reaction aid can kill the bacteria remaining in the rubber powder under the action of the synergistic process, and can realize the antibacterial property of the rubber in subsequent use. Meanwhile, the active carbon is used to filter and adsorb air, thereby realizing the double deodorization and molecular-level purification of the rubber powder, and the complete odorlessness of the product can be ensured.

Description

Technical Field

[0001] This invention relates to the field of recycled rubber technology, specifically to an environmentally friendly, odorless, high-strength recycled rubber and its preparation method. Background Technology

[0002] Rubber products are widely used and have appeared in all aspects of our lives, such as rubber tires, rubber valves, and rubber furniture. However, rubber products are extremely difficult to degrade in their natural state, so it is necessary to recycle and reuse waste rubber products.

[0003] Existing environmentally friendly, odorless, high-strength reclaimed rubber and its preparation methods utilize traditional rubber regeneration mechanisms. This involves using the mechanical shear force and high temperature of an extruder to break the disulfide bonds ("-SS-") in the vulcanized rubber powder, which are easier to break than the carbon-carbon bonds ("-CC-"). While these methods can achieve the regeneration of rubber, current production processes rely solely on the addition of montmorillonite nano-reaction aids to physically adsorb impurities during production. This process depends heavily on the high specific surface area (>600 m²) of nanomaterials. 2 g -1 With abundant adsorption sites, it can quickly adsorb most of the odor molecules (such as sulfides, small molecule organic matter, etc.) in desulfurized rubber powder, and the odor removal rate can reach more than 90% in 24 hours. It can quickly reduce the odor concentration of rubber powder and meet the basic environmental protection and odorless requirements. However, it can only achieve "physical adsorption" and cannot completely decompose odor molecules. The adsorbed odor molecules still remain on the surface of the montmorillonite nano-adsorbent. If the adsorption reaches saturation (effective period of about 2 years), odor desorption and rebound are likely to occur, and the adsorbent needs to be replaced and added. At the same time, the adsorbent has limited adsorption capacity for trace odor molecules wrapped inside the rubber powder. The single nano-adsorption technology is not effective in removing odors and cannot achieve the antibacterial effect of rubber.

[0004] Therefore, there is an urgent need to develop an environmentally friendly, odorless, high-strength reclaimed rubber to solve the problem of incomplete odor removal in existing technologies. Summary of the Invention

[0005] The purpose of this invention is to provide an environmentally friendly, odorless, high-strength reclaimed rubber and its preparation method. Through dual deodorization and molecular-level purification, the odor in the rubber powder is completely removed, and an antibacterial effect is achieved.

[0006] To achieve the above objectives, the present invention provides the following technical solution: An environmentally friendly, odorless, high-strength recycled rubber and its preparation method, wherein the raw materials, by weight, include: 100 parts by weight of solid waste rubber powder, 0.9-1.4 parts by weight of chemical modifier, and 2-3 parts by weight of pure water; The chemical modifier consists of 0.3-0.5 parts by weight of straw-modified lignin, 0.2-0.3 parts by weight of hydroquinone dimethyl ether, and 0.4-0.6 parts by weight of dimorpholine disulfide.

[0007] As a further embodiment of the present invention: 0.3 to 0.5 parts by weight of straw-modified lignin and 0.2 to 0.3 parts by weight of hydroquinone dimethyl ether need to be mixed and dissolved with 2 to 3 parts by weight of pure water during use.

[0008] By adopting the above technical solution, the mixed dissolution of straw-modified lignin and hydroquinone dimethyl ether, combined with the use of dimorpholine disulfide, achieved the modification pretreatment of solid waste rubber powder.

[0009] As a further aspect of the present invention: the mixed oil comprises a plant-based softener, a plant-based thickener, and a reinforcing resin, wherein the plant-based softener is refined tall oil, the plant-based thickener is wood distilled resin, and the reinforcing resin is rosin.

[0010] By adopting the above technical solutions, plant-based softeners, plant-based tackifiers, and reinforcing resins can soften rubber molecular chains, improve the compatibility of rubber powder, and assist in the subsequent improvement of mechanical properties. Furthermore, environmentally friendly additives are selected to meet the product's odorless requirements.

[0011] A method for preparing an environmentally friendly, odorless, high-strength reclaimed rubber, using the aforementioned environmentally friendly, odorless, high-strength reclaimed rubber, includes the following steps: S1: Pulverize solid waste rubber tires that are free of impurities and mold to obtain solid waste rubber powder of 30-50 mesh, and remove impurities from the solid waste rubber powder. S2: Weigh the solid waste rubber powder and, by weight, stir straw-modified lignin and hydroquinone dimethyl ether with water at 25°C for 60-90 seconds to obtain a transparent light yellow liquid with no visible particles, no flocculent matter, no layering, no crystal precipitation, and no suspended matter. Then, spray the aqueous solution evenly onto the surface of the solid waste rubber powder. S3: Add dimorpholine disulfide directly to solid waste rubber powder; S4: Add plant-based softener, plant-based thickener, and reinforcing resin to a high-speed mixing tank and stir at 80~100℃ for 220~250 seconds until a transparent / semi-transparent mixed oil is obtained. Control the discharge temperature to prevent the additives from volatilizing. S5: Add the mixed oil obtained in S4, the modified and pretreated solid waste rubber powder in S2 and S3 into a mixing tank, stir at 80~100℃ for 220~250 seconds, and the discharge temperature is 90~105℃ to obtain a uniformly mixed powder. S6: The mixed powder is fed into the screw extrusion desulfurization equipment and desulfurized at 180~260℃ and atmospheric pressure for 15~25 minutes. After desulfurization, the rubber powder is rapidly cooled by dual gas synergistic phase change, and then fed into the oxygen-free sealed jacket cooling screw for 10~12 minutes. The discharge temperature is controlled to be ≤40℃ to obtain desulfurized powder. The entire process is oxygen-free. S7: Plant-based deodorizers are added to the rubber powder. Nano-adsorption deodorization technology and microwave molecular degradation technology are used to deodorize the desulfurization powder. The step-by-step synergistic deodorization technology of "first adsorption and enrichment, then microwave chain breaking" achieves the first enrichment and then degradation of odors. Then, the exhaust port of the reaction equipment needs to be connected to an activated carbon adsorption filter plate. S8: Feed the uniformly mixed desulfurization powder into the refining equipment and control the refining temperature at 75~90℃ to eliminate trace impurities and internal stress in the desulfurization powder, so that the rubber compound has a uniform texture and smooth surface. S9: Through automatic coiling and sheeting, recycled rubber is prepared, and then weighed, packaged, labeled, and stored in the warehouse according to standards.

[0012] By adopting the above technical solution, and through the recycling and reprocessing of solid waste rubber, the production of environmentally friendly, odorless, high-strength recycled rubber is achieved. Through the mechanical shearing force of multi-stage screw extrusion, combined with the catalytic effect of chemical modifiers such as dimorpholine disulfide, the aged vulcanization bonds (SS bonds, CS bonds) in the solid waste rubber powder are directionally broken, disrupting the original rigid molecular cross-linking structure. Under high temperature and high mechanical shearing, the C-C covalent bonds on the rubber molecular chain undergo heterolytic cleavage, generating highly active carbocations and carbocations. Utilizing the characteristic of these highly active carbocations and carbocations that can graft functional groups without a catalyst, the composite functionalizing modifier of this invention is grafted onto the recycled rubber molecular chain, thereby improving the miscibility of the recycled rubber with general-purpose rubber, making the performance of the recycled rubber of this invention closer to that of general-purpose rubber, while also improving the mechanical and processing properties of the recycled rubber.

[0013] As a further aspect of the present invention: in step S1, impurities in solid waste rubber powder are screened out by means of vibration screening and magnetic separation.

[0014] By adopting the above technical solution, the rubber powder can pass smoothly through the screen using a linear vibrating screen at a frequency of 20-30Hz and 1.5-3mm without impurities being bounced through the screen. This allows for the removal of larger impurities from the solid waste rubber powder. At the same time, magnetic separation is used to remove impurities. The strong magnetic separation of the permanent magnet drum separator can adsorb fine ferromagnetic impurities, allowing for the removal of impurities such as metal wires, stones, and fabrics from the rubber powder.

[0015] As a further aspect of the present invention: In step S2, after the straw-modified lignin and hydroquinone dimethyl ether aqueous solution are stirred until completely fused, the aqueous solution of the two needs to be sprayed onto the surface of the adhesive powder and left to stand.

[0016] By adopting the above technical solution, the mixing of straw-modified lignin, hydroquinone dimethyl ether, and dimorpholine disulfide enables the pre-mixing of softening, thickening, and reinforcing additives, forming a stable mixed oil that ensures uniform dispersion when mixed with rubber powder, thereby improving the processing performance and strength of reclaimed rubber.

[0017] As a further aspect of the present invention: in step S4, the mass ratio of plant-based softener, plant-based thickener, and reinforcing resin is 12:3:2.5.

[0018] By adopting the above technical solution, the above ratio can achieve the best balance between the softening degree, interfacial adhesion and reinforcement effect of the rubber compound, so that the solid waste rubber powder is fully wetted, uniformly mixed and successfully desulfurized, and finally high-strength, high-elasticity, environmentally friendly and odorless recycled rubber is obtained. This ratio was obtained through experimental optimization and has non-obviousness and significant progress.

[0019] Only when the ratio is around 12:3:2.5 can the above indicators reach their optimal state simultaneously; If any component deviates by more than ±20%, at least two performance characteristics will deteriorate significantly.

[0020] As a further aspect of the present invention: in step S6, the two gases used are nitrogen and argon, with a mass ratio of 3:1.

[0021] By adopting the above technical solution, nitrogen and argon are used in combination, providing double oxygen isolation and oxidation prevention, resulting in relatively stable performance. This reduces nitrogen consumption and lowers costs. During the cooling process, a slight phase change occurs, absorbing a large amount of heat while forming a dense "gas film protective layer" on the surface of the rubber powder. Simultaneously, in step S6, the cross-linking polysulfide bonds "-SS-" break, and the "CC" single bonds break, achieving desulfurization of the vulcanized rubber. Through the mechanical shear force of multi-stage screw extrusion, combined with the catalytic effect of chemical modifiers such as dimorpholine disulfide, the aged vulcanization bonds (SS bonds, CS bonds) in the solid waste rubber powder are directionally broken. The original rigid molecular cross-linking structure is broken. Under high temperature and high mechanical shear, the C-C covalent bonds on the rubber molecular chain will undergo heterolytic cleavage, generating highly active carbocations and carbocations. Taking advantage of the characteristic that these highly active carbocations and carbocations can graft functional groups without a catalyst, the composite functionalized modifier of this invention is grafted onto the reclaimed rubber molecular chain, thereby improving the miscibility of reclaimed rubber with general-purpose rubber, making the performance of the reclaimed rubber of this invention closer to that of general-purpose rubber, and also improving the mechanical and processing properties of the reclaimed rubber.

[0022] As a further aspect of the present invention: in step S7, the plant-based deodorizing agent is a montmorillonite nano-reaction aid, requiring 10-15 parts by weight.

[0023] By adopting the above technical solution, step S7 first preheats with low power (300W) microwave for 2 minutes, and then increases the microwave power to 450~600W for 3~4 minutes to treat. The "nano-adsorption deodorization technology" and "microwave molecular degradation technology" are integrated to form an "adsorption-degradation synergistic antibacterial process". Neither technology alone has an "antibacterial" effect. After integration, the nano-adsorbent (montmorillonite) will generate hydroxyl radicals on its surface under microwave action, which can not only completely remove odors, but also kill bacteria remaining in the adhesive powder.

[0024] As a further aspect of the present invention: in step S8, the desulfurization powder needs to be refined three or more times.

[0025] By adopting the above technical solution and through multiple refining processes, the internal stress of the rubber was effectively eliminated.

[0026] Compared with existing technologies, the beneficial effects of this invention are as follows: By employing a synergistic process of nano-adsorption deodorization technology and microwave molecular degradation technology, when deodorizing rubber powder, it can achieve both physical adsorption of odors and degradation of odor molecules. Furthermore, the fused nano-adsorbent (montmorillonite) generates hydroxyl radicals on its surface under microwave action, which not only thoroughly removes odors but also kills residual bacteria in the rubber powder, enhancing the deodorization effect. Simultaneously, microwave energy can restore the adsorption activity of montmorillonite, allowing for its reuse, reducing production costs, and meeting the requirements of environmentally friendly and odorless processes. This is further enhanced by the filtration and adsorption of air by activated carbon. This process achieves dual deodorization and molecular-level purification of rubber powder, ensuring the product is completely odorless. Furthermore, the use of modified montmorillonite nano-reaction additives, through a synergistic process, enables montmorillonite, which itself lacks bactericidal capabilities, to enhance the antibacterial properties of the rubber during subsequent use, preventing bacterial growth in reclaimed rubber. This achieves a closed-loop synergy of "adsorption-degradation-regeneration," solving the industry pain points of traditional adsorbents being easily saturated and requiring frequent replacement. The combination of these two technologies not only achieves the dual effects of deodorization (odor removal rate ≥95%) and sterilization but also unexpectedly solves the problems of odor rebound after deodorization and residues after sterilization in reclaimed rubber.

[0027] Other features and advantages of the present invention will be disclosed in detail in the following detailed description and accompanying drawings. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the process structure of an environmentally friendly, odorless, high-strength reclaimed rubber and its preparation method in an embodiment of the present invention. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] In this embodiment of the invention, an environmentally friendly, odorless, high-strength reclaimed rubber and its preparation method are described below. Figure 1 As shown, by weight, the raw materials include: 100 parts by weight of solid waste rubber powder, 0.9 to 1.4 parts by weight of chemical modifier, 17.5 parts by weight of mixed oil, and 2 to 3 parts by weight of pure water; The chemical modifier consists of 0.3-0.5 parts by weight of straw-modified lignin, 0.2-0.3 parts by weight of hydroquinone dimethyl ether, and 0.4-0.6 parts by weight of dimorpholine disulfide.

[0031] In this embodiment, 0.3 to 0.5 parts by weight of the straw-modified lignin and 0.2 to 0.3 parts by weight of the hydroquinone dimethyl ether need to be mixed and dissolved with 2 to 3 parts by weight of pure water during use. The mixing and dissolution of the straw-modified lignin and hydroquinone dimethyl ether, together with the use of dimorpholine disulfide, achieves the modification pretreatment of solid waste rubber powder.

[0032] In this embodiment, the mixed oil includes a plant-based softener, a plant-based thickener, and a reinforcing resin. The plant-based softener is refined tall oil, the plant-based thickener is wood distilled resin, and the reinforcing resin is rosin.

[0033] In this embodiment, the following steps are included: S1: Pulverize solid waste rubber tires that are free of impurities and mold to obtain solid waste rubber powder of 30-50 mesh, and remove impurities from the solid waste rubber powder. S2: Weigh the solid waste rubber powder and, by weight, stir straw-modified lignin and hydroquinone dimethyl ether with water at 25°C for 60-90 seconds to obtain a transparent light yellow liquid with no visible particles, no flocculent matter, no layering, no crystal precipitation, and no suspended matter. Then, spray the aqueous solution evenly onto the surface of the solid waste rubber powder. S3: Add dimorpholine disulfide directly to solid waste rubber powder; S4: Add plant-based softener, plant-based thickener, and reinforcing resin to a high-speed mixing tank and stir at 80~100℃ for 220~250 seconds until a transparent / semi-transparent mixed oil is obtained. Control the discharge temperature to prevent the additives from volatilizing. S5: Add the mixed oil obtained in S4, the modified and pretreated solid waste rubber powder in S2 and S3 into a mixing tank, stir at 80~100℃ for 220~250 seconds, and the discharge temperature is 90~105℃ to obtain a uniformly mixed powder. S6: The mixed powder is fed into the screw extrusion desulfurization equipment and desulfurized at 180~260℃ and atmospheric pressure for 15~25 minutes. After desulfurization, the rubber powder is rapidly cooled by dual gas synergistic phase change, and then fed into the oxygen-free sealed jacket cooling screw for 10~12 minutes. The discharge temperature is controlled to be ≤40℃ to obtain desulfurized powder. The entire process is oxygen-free. S7: Plant-based deodorizers added to the rubber powder, nano-adsorption deodorization technology and microwave molecular degradation technology are used to deodorize the desulfurization powder. The step-by-step synergistic deodorization technology of "first adsorption and enrichment, then microwave chain breaking" achieves the first enrichment and then degradation of odors. S8: Feed the uniformly mixed desulfurization powder into the refining equipment and control the refining temperature at 75~90℃ to eliminate trace impurities and internal stress in the desulfurization powder, so that the rubber compound has a uniform texture and smooth surface. S9: Through automatic coiling and sheeting, recycled rubber is prepared, then weighed, packaged, labeled, and stored according to standards. This process of recycling and reprocessing solid waste rubber enables the production of environmentally friendly, odorless, and high-strength recycled rubber. The mechanical shearing force of multi-stage screw extrusion, combined with the catalytic action of chemical modifiers such as dimorpholine disulfide, directionally breaks the aged vulcanization bonds (SS bonds, CS bonds) in the solid waste rubber powder, breaking the original rigid molecular cross-linking structure. Under high temperature and high mechanical shearing, the C-C covalent bonds on the rubber molecular chain undergo heterolytic cleavage, generating highly active carbocations and carbocations. Utilizing the characteristic of these highly active carbocations and carbocations that can graft functional groups without a catalyst, the composite functionalizing modifier of this invention is grafted onto the recycled rubber molecular chain, thereby improving the miscibility of recycled rubber with general-purpose rubber. This makes the performance of the recycled rubber of this invention closer to that of general-purpose rubber, while also improving the mechanical and processing properties of the recycled rubber.

[0034] In this embodiment, in step S1, the solid waste rubber powder is cleaned by vibrating sieving and magnetic separation. Vibrating sieving can remove larger impurities from the solid waste rubber powder, while magnetic separation can remove impurities such as metal wires, stones, and fabrics from the rubber powder.

[0035] In this embodiment, in step S2, after the aqueous solutions of straw-modified lignin and hydroquinone dimethyl ether are stirred until completely mixed, the aqueous solutions of the two need to be sprayed onto the surface of the rubber powder and left to stand. The mixing of straw-modified lignin, hydroquinone dimethyl ether, and dimorpholine disulfide achieves the pre-mixing of softening, thickening, and reinforcing additives, forming a stable mixed oil, ensuring uniform dispersion when mixed with rubber powder later, and improving the processing performance and strength of reclaimed rubber.

[0036] In this embodiment, in step S4, the mass ratio of plant-based softener, plant-based tackifier, and reinforcing resin is 12:3:2.5. The plant-based softener, plant-based tackifier, and reinforcing resin can soften the rubber molecular chains, improve the compatibility of the rubber powder, and assist in the subsequent improvement of mechanical properties. In addition, environmentally friendly additives are selected to meet the requirement of odorless products.

[0037] In this embodiment, in step S6, nitrogen and argon are used as the two gases, with a mass ratio of 3:1. The fusion of nitrogen and argon provides double oxygen isolation and oxidation prevention, resulting in more stable performance. This reduces the amount of nitrogen used and lowers costs. During the cooling process, a slight phase change occurs, absorbing a large amount of heat while forming a dense "gas film protective layer" on the surface of the rubber powder. Simultaneously, in step S6, the crosslinking polysulfide bonds "-SS-" break, and the "CC" single bonds break, achieving desulfurization of the vulcanized rubber. Through the mechanical shear force of multi-stage screw extrusion, combined with the catalytic effect of chemical modifiers such as dimorpholine disulfide, the aged vulcanization bonds (SS bonds, CS bonds) in the solid waste rubber powder are directionally broken. The original rigid molecular cross-linking structure is broken. Under high temperature and high mechanical shear, the C-C covalent bonds on the rubber molecular chain will undergo heterolytic cleavage, generating highly active carbocations and carbocations. Taking advantage of the characteristic that these highly active carbocations and carbocations can graft functional groups without a catalyst, the composite functionalized modifier of this invention is grafted onto the reclaimed rubber molecular chain, thereby improving the miscibility of reclaimed rubber with general-purpose rubber, making the performance of the reclaimed rubber of this invention closer to that of general-purpose rubber, and also improving the mechanical and processing properties of the reclaimed rubber.

[0038] In this embodiment, in step S7, the plant-based deodorizer is a montmorillonite nano-reaction aid, requiring 10-15 parts by weight. The "nano-adsorption deodorization technology" and the "microwave molecular degradation technology" are combined to form an "adsorption-degradation synergistic antibacterial process". Neither technology alone has an "antibacterial" effect. After fusion, the nano-adsorbent will generate hydroxyl radicals on its surface under microwave action, which can not only completely remove odors, but also kill bacteria remaining in the adhesive powder. Microwave molecular degradation technology requires preheating with low-power microwaves (300W) for 2 minutes. During this time, the nano-adsorbent relies on its high specific surface area (>600 m²) 2 g -1 The microwave quickly adsorbs most of the odor molecules on the surface and shallow layer of the adhesive powder, initially reducing the odor concentration. Then, the microwave power is increased to 450~600W, and the frequency is maintained at 2450MHz for 3~4 minutes.

[0039] Comparative Test: Achieving a closed-loop synergy of "adsorption-degradation-regeneration".

[0040] In this embodiment, in step S8, the desulfurization powder needs to be refined three or more times. Through multiple refining processes, the internal stress of the rubber is eliminated.

[0041] This invention provides an environmentally friendly, odorless, high-strength recycled rubber and its preparation method, which can adsorb, degrade, and filter the odors generated during the rubber production process, achieving complete removal of odors and also achieving antibacterial effects.

[0042] 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 its spirit or essential characteristics. 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, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0043] 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. An environmentally friendly, odorless, high-strength reclaimed rubber, characterized in that, By weight, the raw materials include: 100 parts by weight of solid waste rubber powder, 0.9 to 1.4 parts by weight of chemical modifier, 17.5 parts by weight of mixed oil, and 2 to 3 parts by weight of pure water; The chemical modifier consists of 0.3-0.5 parts by weight of straw-modified lignin, 0.2-0.3 parts by weight of hydroquinone dimethyl ether, and 0.4-0.6 parts by weight of dimorpholine disulfide.

2. The environmentally friendly, odorless, high-strength reclaimed rubber according to claim 1, characterized in that, 0.3 to 0.5 parts by weight of the straw-modified lignin and 0.2 to 0.3 parts by weight of the hydroquinone dimethyl ether need to be mixed and dissolved with 2 to 3 parts by weight of pure water before use.

3. The environmentally friendly, odorless, high-strength reclaimed rubber according to claim 1, characterized in that, The mixed oils include a plant-based softener, a plant-based thickener, and a reinforcing resin. The plant-based softener is refined tall oil, the plant-based thickener is wood-based distilled resin, and the reinforcing resin is rosin.

4. A method for preparing an environmentally friendly, odorless, high-strength reclaimed rubber, comprising using the environmentally friendly, odorless, high-strength reclaimed rubber as described in any one of claims 1 to 3, characterized in that, Includes the following steps: S1: Pulverize solid waste rubber tires that are free of impurities and mold to obtain solid waste rubber powder of 30-50 mesh, and remove impurities from the solid waste rubber powder. S2: Weigh the solid waste rubber powder and, by weight, stir straw-modified lignin and hydroquinone dimethyl ether with water at 25°C for 60-90 seconds to obtain a transparent light yellow liquid with no visible particles, no flocculent matter, no layering, no crystal precipitation, and no suspended matter. Then, spray the aqueous solution evenly onto the surface of the solid waste rubber powder. S3: Add dimorpholine disulfide directly to solid waste rubber powder; S4: Add plant-based softener, plant-based thickener, and reinforcing resin to a high-speed mixing tank and stir at 80~100℃ for 220~250 seconds until a transparent / semi-transparent mixed oil is obtained. Control the discharge temperature to prevent the additives from volatilizing. S5: Add the mixed oil obtained in S4, the modified pretreated solid waste rubber powder in S2 and S3 into a mixing tank, stir at 80~100℃ for 220~250 seconds, and the discharge temperature is 90~105℃ to obtain a uniformly mixed powder. S6: The mixed powder is fed into the screw extrusion desulfurization equipment and desulfurized at 180~260℃ and atmospheric pressure for 15~25 minutes. After desulfurization, the rubber powder is rapidly cooled by dual gas synergistic phase change, and then fed into the oxygen-free sealed jacket cooling screw for 10~12 minutes. The discharge temperature is controlled to be ≤40℃ to obtain desulfurized powder. The entire process is oxygen-free. S7: Plant-based deodorizers are added to the rubber powder. Nano-adsorption deodorization technology and microwave molecular degradation technology are used to deodorize the desulfurization powder. The step-by-step synergistic deodorization technology of "first adsorption and enrichment, then microwave chain breaking" achieves the first enrichment and then degradation of odors. Then, activated carbon adsorption filter plates need to be connected to the exhaust port of the reaction equipment. S8: Feed the uniformly mixed desulfurization powder into the refining equipment and control the refining temperature at 75~90℃ to eliminate trace impurities and internal stress in the desulfurization powder, so that the rubber compound has a uniform texture and smooth surface. S9: Through automatic coiling and sheeting, recycled rubber is prepared, and then weighed, packaged, labeled, and stored in the warehouse according to standards.

5. The method for preparing an environmentally friendly, odorless, high-strength reclaimed rubber according to claim 4, characterized in that... In step S1, impurities in solid waste rubber powder are removed by vibrating sieving and magnetic separation.

6. The method for preparing an environmentally friendly, odorless, high-strength reclaimed rubber according to claim 4, characterized in that, In step S2, after the straw-modified lignin and hydroquinone dimethyl ether aqueous solution are stirred until completely mixed, the aqueous solution of the two needs to be sprayed onto the surface of the adhesive powder and left to stand for 3-5 minutes.

7. The method for preparing an environmentally friendly, odorless, high-strength reclaimed rubber according to claim 4, characterized in that, In step S4, the mass ratio of plant-based softener, plant-based tackifier, and reinforcing resin is 12:3:2.

5.

8. The method for preparing an environmentally friendly, odorless, high-strength reclaimed rubber according to claim 4, characterized in that, In step S6, the two gases used are nitrogen and argon, with a mass ratio of 3:

1.

9. The method for preparing an environmentally friendly, odorless, high-strength reclaimed rubber according to claim 4, characterized in that... In step S7, the plant-based deodorizer is a montmorillonite nano-reaction aid, requiring 10-15 parts by weight.

10. The method for preparing an environmentally friendly, odorless, high-strength reclaimed rubber according to claim 4, characterized in that, In step S8, the desulfurization powder needs to be refined three or more times.

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