Preparation method of desulfurized rubber modified asphalt

Abstract

The invention relates to the technical field of road engineering auxiliary materials, in particular to a preparation method of desulfurized rubber modified asphalt. Waste rubber powder is subjected to soaking treatment with ammonium bicarbonate in advance, so that uniform holes are formed in the waste rubber powder, in the process of doping the rubber powder into matrix asphalt for modification, due to the fact that rubber is subjected to desulfurization treatment in advance, and thermococcus thermophilic archaea oil is added, the desulfurized rubber powder can be rapidly dispersed in the matrix asphalt; according to the preparation method, the desulfurized rubber does not need to be swelled at a high temperature for a long time and then subjected to a desulfurization reaction when being combined with the matrix asphalt, so that the high-temperature reaction time is shortened, addition of an octyl phosphate cracking agent is omitted, and reduction of skid resistance and durability caused by addition of the octyl phosphate cracking agent is avoided; the loss of light volatile components in the rubber and the matrix asphalt due to long-time reaction at high temperature is reduced, so that the performance reduction of the asphalt is reduced, and the pollution of the volatile components to the environment is also reduced.

Description

Technical Field

[0001] The invention relates to the technical field of road engineering auxiliary materials, and in particular to a method for preparing desulfurized rubber modified asphalt. Background Art

[0002] The Chinese patent with the authorization announcement number CN110229534B discloses a method for preparing desulfurized rubber modified asphalt, which comprises a specific ratio of base asphalt, rubber powder, microalgae oil, and a cracking agent, and by adding the cracking agent octyl phosphate, the surface energy and chemical energy of the rubber powder are increased, and its polarity and reactivity are enhanced, and the full interaction between the rubber powder and the asphalt is promoted. By adding microalgae oil, the performance of the desulfurized rubber asphalt is effectively improved. However, the addition of octyl phosphate to asphalt will bring some unfavorable factors. The addition of octyl phosphate may reduce the adhesion of asphalt, resulting in a weakening of the bonding force between asphalt and aggregate, thereby affecting the skid resistance and durability of the road surface. Octyl phosphate may accelerate the aging process of asphalt, resulting in a significant decline in the performance of asphalt in a relatively short period of time.

[0003] Therefore, how to improve the preparation method of desulfurized rubber modified asphalt so that the desulfurized rubber modified asphalt can maintain good performance for a long time has become a technical problem that needs to be solved urgently. Summary of the invention

[0004] The technical problem to be solved by the present invention is: how to improve the preparation method of desulfurized rubber modified asphalt so that the desulfurized rubber modified asphalt can maintain good performance for a long time.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] The method for preparing desulfurized rubber modified asphalt comprises the following steps:

[0007] Step 1: crush the waste rubber to a particle size of 400-600 μm, immerse it in an ammonium bicarbonate solution, wherein the ammonium bicarbonate solution is prepared by mixing ammonium bicarbonate powder and water in a mass ratio of 1-3:10, and react at 60° C. with stirring for 1-2 days;

[0008] Step 2: filtering out the waste rubber powder soaked in ammonium bicarbonate, and performing a desulfurization reaction to obtain desulfurized rubber powder;

[0009] Step 3: filtering out the Thermococcus thermophilic archaea fermentation liquid through a 0.22 μm microporous filter membrane, drying the filtered Thermococcus thermophilic archaea, mixing with anhydrous ethanol at a mass ratio of 1:20-30, reacting in a high-pressure homogenizer, soaking at 25-30° C. for 3-5 hours, filtering out the Thermococcus thermophilic archaea through a 0.22 μm microporous filter membrane, separating ethanol in the filtrate by distillation, and obtaining Thermococcus thermophilic archaea oil;

[0010] Step 4: Mix the desulfurized rubber powder, Thermococcus thermophilic archaea oil and base asphalt in a mass ratio of 20-30:3-5:80-90, and shear and stir at 3500-4000 r / min for 10-13 min at 120-130° C. to obtain a desulfurized rubber modified asphalt product.

[0011] Furthermore, in the above-mentioned method for preparing desulfurized rubber modified asphalt, the step 2 specifically comprises:

[0012] Step 21: preparing LB culture medium, inoculating activated heterotrophic nitrification-denitrifying bacteria into the LB culture medium, and culturing at 30-40° C. for 24-30 hours to obtain a heterotrophic nitrification-denitrifying bacteria solution;

[0013] Step 22: Mix the heterotrophic nitrification-denitrification bacteria solution with the waste rubber powder in a mass ratio of 1:0.2, and react at 30-40° C. for 3-4 hours, then filter out the waste rubber powder, disinfect it, and set it aside;

[0014] Step 23: adding culture medium, thermophilic archaea of ​​the genus Thermococcus and YPS culture medium into the fermentation tank, adding sodium chloride with a mass ratio of 4-5% into YPS, controlling the pH at 6.5-7, the temperature at 90-94° C., the stirring speed at 400-500 rpm, the pressure at 0.1-0.2 MPa, and reacting for 26-30 hours;

[0015] Step 24: The waste rubber powder filtered out in step 22 is put into a closed fermentation tank, the mass ratio of waste rubber to YPS culture medium is 1:3-5, the pH is controlled at 6.5-7, the temperature is controlled at 90-94°C, the stirring speed is 400-500rpm, and the pressure is 0.1-0.2MPa. After reacting for 3-4 days, the waste rubber powder is filtered out and dried to obtain devulcanized rubber.

[0016] Furthermore, in the above-mentioned method for preparing desulfurized rubber modified asphalt, the heterotrophic nitrifying-denitrifying bacteria DNF23.

[0017] Furthermore, in the above-mentioned method for preparing desulfurized rubber modified asphalt, the Thermococcus thermophilic archaeon is Thermococcus thermophilic archaeon HJ21.

[0018] Furthermore, in the above method for preparing desulfurized rubber modified asphalt, the waste rubber is selected from waste tire tread rubber.

[0019] The beneficial effects of the present invention are as follows: the waste rubber powder is pre-immersed in ammonium bicarbonate to form uniform pores in the waste rubber powder, so that it can be more completely desulfurized at a lower temperature. In the process of adding the desulfurized rubber powder into the matrix asphalt for modification, since the rubber has been pre-desulfurized and the thermophilic archaea oil of the genus Thermococcus is added, the desulfurized rubber powder can be quickly dispersed in the matrix asphalt, so that the desulfurized rubber does not need to be swollen at high temperature for a long time before the desulfurization reaction when combined with the matrix asphalt, thereby shortening the high-temperature reaction time, and omitting the addition of octyl phosphate cracking agent, avoiding the reduction of skid resistance and durability due to the addition of octyl phosphate cracking agent, reducing the loss of light volatile components in the rubber and matrix asphalt due to the long-term reaction at high temperature, thereby reducing the performance of the asphalt, and reducing the pollution of the volatile components to the environment. DETAILED DESCRIPTION

[0020] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in conjunction with the implementation modes.

[0021] The method for preparing desulfurized rubber modified asphalt comprises the following steps:

[0022] Step 1: crush the waste rubber to a particle size of 400-600 μm, immerse it in an ammonium bicarbonate solution, wherein the ammonium bicarbonate solution is prepared by mixing ammonium bicarbonate powder and water in a mass ratio of 1-3:10, and react at 60° C. with stirring for 1-2 days;

[0023] Step 2: filtering out the waste rubber powder soaked in ammonium bicarbonate, and performing a desulfurization reaction to obtain desulfurized rubber powder;

[0024] Step 3: filtering out the Thermococcus thermophilic archaea fermentation liquid through a 0.22 μm microporous filter membrane, drying the filtered Thermococcus thermophilic archaea, mixing with anhydrous ethanol at a mass ratio of 1:20-30, reacting in a high-pressure homogenizer, soaking at 25-30° C. for 3-5 hours, filtering out the Thermococcus thermophilic archaea through a 0.22 μm microporous filter membrane, separating ethanol in the filtrate by distillation, and obtaining Thermococcus thermophilic archaea oil;

[0025] Step 4: Mix the desulfurized rubber powder, Thermococcus thermophilic archaea oil and base asphalt in a mass ratio of 20-30:3-5:80-90, and shear and stir at 3500-4000 r / min for 10-13 min at 120-130° C. to obtain a desulfurized rubber modified asphalt product.

[0026] In the above embodiment, the waste rubber powder is pre-immersed in ammonium bicarbonate to form uniform pores in the waste rubber powder, so that it can be more completely desulfurized at a lower temperature. In the process of adding the desulfurized rubber powder into the matrix asphalt for modification, since the rubber has been pre-desulfurized and the thermophilic archaea oil of the genus Thermococcus is added, the desulfurized rubber powder can be quickly dispersed in the matrix asphalt, so that the desulfurized rubber does not need to be swollen at high temperature for a long time before the desulfurization reaction when combined with the matrix asphalt, thereby shortening the high-temperature reaction time and omitting the addition of octyl phosphate cracking agent, thereby avoiding the decrease in skid resistance and durability due to the addition of octyl phosphate cracking agent, reducing the loss of light volatile components in the rubber and matrix asphalt due to the long-term reaction at high temperature, thereby reducing the performance of the asphalt and reducing the pollution of the volatile components to the environment.

[0027] As a preferred implementation, the step 2 specifically includes:

[0028] Step 21: preparing LB culture medium, inoculating activated heterotrophic nitrification-denitrifying bacteria into the LB culture medium, and culturing at 30-40° C. for 24-30 hours to obtain a heterotrophic nitrification-denitrifying bacteria solution;

[0029] Step 22: Mix the heterotrophic nitrification-denitrification bacteria solution with the waste rubber powder in a mass ratio of 1:0.2, and react at 30-40° C. for 3-4 hours, then filter out the waste rubber powder, disinfect it, and set it aside;

[0030] Step 23: adding culture medium, thermophilic archaea of ​​the genus Thermococcus and YPS culture medium into the fermentation tank, adding sodium chloride with a mass ratio of 4-5% into YPS, controlling the pH at 6.5-7, the temperature at 90-94° C., the stirring speed at 400-500 rpm, the pressure at 0.1-0.2 MPa, and reacting for 26-30 hours;

[0031] Step 24: The waste rubber powder filtered out in step 22 is put into a closed fermentation tank, the mass ratio of waste rubber to YPS culture medium is 1:3-5, the pH is controlled at 6.5-7, the temperature is controlled at 90-94°C, the stirring speed is 400-500rpm, and the pressure is 0.1-0.2MPa. After reacting for 3-4 days, the waste rubber powder is filtered out and dried to obtain desulfurized rubber, and the filtrate is the fermentation liquid of thermophilic archaea of ​​the genus Thermococcus.

[0032] In the above implementation mode, by adding heterotrophic nitrification-denitrification bacteria liquid, it can react with zinc oxide present in waste rubber, separate zinc oxide in waste rubber by cell surface adsorption, and mix waste rubber powder with thermophilic archaea of ​​the genus Thermococcus, and ferment at 90-94°C in a closed environment, so that the fermentation product can break the sulfur bond in the waste rubber to achieve the purpose of desulfurization. Since thermophilic archaea of ​​the genus Thermococcus can survive at higher temperatures, its reaction is more intense than that of bacteria that survive at room temperature. The fermentation product can better penetrate the waste rubber particles. Since the waste rubber particles themselves have dense micropores after being treated with ammonium bicarbonate, the fermentation product can more completely break the sulfur bonds of the waste rubber particles, which is beneficial to the subsequent uniform fusion with the matrix asphalt at a lower temperature and avoids the loss of volatile components caused by long-term high-temperature reaction.

[0033] As a preferred embodiment, the heterotrophic nitrification-good denitrification bacteria DNF23 is purchased from Guangdong Microbiological Culture Collection Center with a collection number of GDMCC No: 60713. The strain is an existing strain and is disclosed in the Chinese patent with publication number CN114084957A.

[0034] As a preferred embodiment, the Thermococcus thermophilic archaeon is Thermococcus thermophilic archaeon HJ21. Thermococcus thermophilic archaeon HJ21 was purchased from China Center for Type Culture Collection with a collection number of CCTCC No: M207010. This strain is an existing strain and is disclosed in Chinese patent publication number CN101070527A.

[0035] As a preferred embodiment, the waste rubber is selected from waste tire tread rubber.

[0036] Example 1

[0037] The method for preparing desulfurized rubber modified asphalt comprises the following steps:

[0038] Step 1: crush the waste tread rubber to a particle size of 500 μm, immerse it in an ammonium bicarbonate solution, wherein the ammonium bicarbonate solution is prepared by mixing ammonium bicarbonate powder and water in a mass ratio of 2:10, and react at 60° C. with stirring for 2 days;

[0039] Step 2: filtering out the waste rubber powder soaked in ammonium bicarbonate and performing a desulfurization reaction to obtain desulfurized rubber powder; specifically comprising:

[0040] Step 21: preparing LB culture medium, inoculating activated heterotrophic nitrification-denitrifying bacteria into the LB culture medium, and culturing at 35° C. for 26 hours to obtain a heterotrophic nitrification-denitrifying bacteria solution;

[0041] Step 22: Mix the heterotrophic nitrification-denitrification bacteria solution and the waste rubber powder in a mass ratio of 1:0.2, and react at 35°C for 3-4 hours, then filter out the waste rubber powder, disinfect it, and set it aside;

[0042] Step 23: adding culture medium, thermophilic archaea of ​​the genus Thermococcus and YPS culture medium into the fermentation tank, adding sodium chloride with a mass ratio of 4-5% into YPS, controlling the pH at 7, the temperature at 92° C., the stirring speed at 400 rpm, the pressure at 0.1-0.2 MPa, and reacting for 28 hours;

[0043] Step 24: the waste rubber powder filtered out in step 22 is put into a closed fermentation tank, the mass ratio of waste rubber to YPS medium is 1:4, the pH is controlled at 7, the temperature is controlled at 90-94°C, the stirring speed is 400rpm, and the pressure is 0.1MPa. After reacting for 4 days, the waste rubber powder is filtered out and dried to obtain devulcanized rubber, and the filtrate is the fermentation liquid of thermophilic archaea of ​​the genus Thermococcus;

[0044] Step 3: The Thermococcus thermophilic archaea fermentation liquid is filtered out through a 0.22 μm microporous filter membrane to remove Thermococcus thermophilic archaea, the filtered Thermococcus thermophilic archaea are dried, mixed with anhydrous ethanol at a mass ratio of 1:25, reacted in a high-pressure homogenizer, soaked at 30° C. for 4 h, filtered out Thermococcus thermophilic archaea through a 0.22 μm microporous filter membrane, and ethanol in the filtrate is separated by distillation to obtain Thermococcus thermophilic archaea oil;

[0045] Step 4: Mix the desulfurized rubber powder, Thermococcus thermophilic archaea oil and base asphalt in a mass ratio of 20-30:4:85, and shear and stir at 3500r / min for 11 minutes at 125°C to obtain a desulfurized rubber modified asphalt product.

[0046] Example 2

[0047] The method for preparing desulfurized rubber modified asphalt comprises the following steps:

[0048] Step 1: crush the waste tread rubber to a particle size of 400 μm, immerse it in an ammonium bicarbonate solution, wherein the ammonium bicarbonate solution is prepared by mixing ammonium bicarbonate powder and water in a mass ratio of 1:10, and react at 60° C. with stirring for 1 day;

[0049] Step 2: filtering out the waste rubber powder soaked in ammonium bicarbonate and performing a desulfurization reaction to obtain desulfurized rubber powder; specifically comprising:

[0050] Step 21: preparing LB culture medium, inoculating activated heterotrophic nitrification-denitrifying bacteria into the LB culture medium, and culturing at 30° C. for 24 hours to obtain a heterotrophic nitrification-denitrifying bacteria solution;

[0051] Step 22: Mix the heterotrophic nitrification-denitrification bacteria solution and the waste rubber powder in a mass ratio of 1:0.2, and react at 30° C. for 3 hours, then filter out the waste rubber powder, disinfect it, and set it aside;

[0052] Step 23: adding culture medium, thermophilic archaea of ​​the genus Thermococcus and YPS culture medium into the fermentation tank, adding 4% sodium chloride by mass to YPS, controlling the pH at 6.5, the temperature at 90° C., the stirring speed at 400 rpm, the pressure at 0.1 MPa, and reacting for 26 hours;

[0053] Step 24: the waste rubber powder filtered out in step 22 is put into a closed fermentation tank, the mass ratio of waste rubber to YPS medium is 1:3, the pH is controlled at 6.5, the temperature is controlled at 90°C, the stirring speed is 400rpm, and the pressure is 0.1MPa. After reacting for 3-4 days, the waste rubber powder is filtered out and dried to obtain devulcanized rubber, and the filtrate is the fermentation liquid of thermophilic archaea of ​​the genus Thermococcus;

[0054] Step 3: filtering out the Thermococcus thermophilic archaea fermentation liquid through a 0.22 μm microporous filter membrane, drying the filtered Thermococcus thermophilic archaea, mixing with anhydrous ethanol at a mass ratio of 1:20-30, reacting in a high-pressure homogenizer, soaking at 25° C. for 3 h, filtering out the Thermococcus thermophilic archaea through a 0.22 μm microporous filter membrane, separating ethanol in the filtrate by distillation, and obtaining Thermococcus thermophilic archaea oil;

[0055] Step 4: Mix the desulfurized rubber powder, Thermococcus thermophilic archaea oil and base asphalt in a mass ratio of 20:3:80, and shear and stir at 3500 r / min for 10 minutes at 120° C. to obtain a desulfurized rubber modified asphalt product.

[0056] Example 3

[0057] The method for preparing desulfurized rubber modified asphalt comprises the following steps:

[0058] Step 1: crush the waste tread rubber to a particle size of 600 μm, immerse it in an ammonium bicarbonate solution, wherein the ammonium bicarbonate solution is prepared by mixing ammonium bicarbonate powder and water in a mass ratio of 3:10, and react at 60° C. with stirring for 2 days;

[0059] Step 2: filtering out the waste rubber powder soaked in ammonium bicarbonate and performing a desulfurization reaction to obtain desulfurized rubber powder; specifically comprising:

[0060] Step 21: preparing LB culture medium, inoculating activated heterotrophic nitrification-denitrifying bacteria into the LB culture medium, and culturing at 40° C. for 30 hours to obtain a heterotrophic nitrification-denitrifying bacteria liquid;

[0061] Step 22: Mix the heterotrophic nitrification-denitrification bacteria solution and the waste rubber powder in a mass ratio of 1:0.2, and react at 40° C. for 3-4 hours, then filter out the waste rubber powder, disinfect it, and set it aside;

[0062] Step 23: adding culture medium, thermophilic archaea of ​​the genus Thermococcus and YPS culture medium into the fermentation tank, adding 5% sodium chloride by mass to YPS, controlling the pH at 7, the temperature at 94° C., the stirring speed at 500 rpm, the pressure at 0.2 MPa, and reacting for 30 hours;

[0063] Step 24: the waste rubber powder filtered out in step 22 is put into a closed fermentation tank, the mass ratio of waste rubber to YPS medium is 1:5, the pH is controlled at 7, the temperature is controlled at 94°C, the stirring speed is 500rpm, and the pressure is 0.1-0.2MPa. After reacting for 3-4 days, the waste rubber powder is filtered out and dried to obtain devulcanized rubber, and the filtrate is the fermentation liquid of thermophilic archaea of ​​the genus Thermococcus;

[0064] Step 3: The Thermococcus thermophilic archaea fermentation liquid is filtered out through a 0.22 μm microporous filter membrane to remove Thermococcus thermophilic archaea, the filtered Thermococcus thermophilic archaea are dried, mixed with anhydrous ethanol at a mass ratio of 1:30, reacted in a high-pressure homogenizer, soaked at 30° C. for 5 h, filtered out Thermococcus thermophilic archaea through a 0.22 μm microporous filter membrane, and ethanol in the filtrate is separated by distillation to obtain Thermococcus thermophilic archaea oil;

[0065] Step 4: Mix the desulfurized rubber powder, Thermococcus thermophilic archaea oil and base asphalt in a mass ratio of 30:5:90, and shear and stir at 4000 r / min for 13 minutes at 130° C. to obtain a desulfurized rubber modified asphalt product.

[0066] Comparative Example 1

[0067] The method for preparing desulfurized rubber modified asphalt described in Example 1 is different in that the step of mixing the waste rubber powder with the ammonium bicarbonate solution in step 1 is omitted, and the other steps remain unchanged.

[0068] Comparative Example 2

[0069] The method for preparing desulfurized rubber modified asphalt described in Example 1 is different in that step 2 is omitted, and in step 3, the desulfurized rubber powder is replaced with waste rubber powder soaked in ammonium bicarbonate, and the other steps remain unchanged.

[0070] Comparative Example 3

[0071] The method for preparing desulfurized rubber modified asphalt described in Example 1 is different in that step 3 is omitted and the addition of Thermococcus thermophilic archaea oil is omitted in step 4.

[0072] Comparative Example 4

[0073] The method for preparing desulfurized rubber modified asphalt described in Example 1 is different in that the desulfurized rubber powder in step 4 is replaced by rubber powder that has not been desulfurized.

[0074] Comparative Example 5

[0075] 100 parts of base asphalt were heated to 170°C, and then 20 parts of tread rubber powder and 0.4 parts of octyl phosphate were slowly added to the base asphalt, and the mixture was stirred at 4000 r / min at a high speed for 70 minutes at 185°C, and then stirred at 500 r / min at a low speed for 50 minutes at 160°C to obtain rubber powder modified asphalt;

[0076] 100 parts of the rubber powder modified asphalt prepared in Example 1 and 40 parts of microalgae oil were preheated to 160° C., and then the microalgae oil was slowly added to the rubber powder modified asphalt, and stirred at a high speed of 4000 r / min at 160° C. for 20 min to obtain a modified rubber asphalt product.

[0077] Experimental example

[0078] According to the test method in the "Test Procedure for Asphalt and Asphalt Mixtures for Highway Engineering" (JTG E20-2011), the softening point, 180°C Brookfield viscosity and ductility of the asphalt products obtained in Examples 1-3 and Comparative Examples 1-5 were tested outdoors for 1 day and 365 days (test location: Longjiang Village, Gaosha Town, Shaxian District, Sanming City, Fujian Province). The results are shown in Table 1:

[0079] Table 1

[0080]

[0081]

[0082] From the results in Table 1, it can be seen that the asphalt products prepared in Examples 1-3 can still maintain the advantages of high softening point, low viscosity and high elongation after being stored outdoors for 365 days, while Comparative Examples 1-5 show varying degrees of decline in asphalt product performance after being stored outdoors for 365 days.

[0083] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention specification, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for preparing desulfurized rubber modified asphalt, characterized in that: The following steps are involved: Step 1: crush the waste rubber to a particle size of 400-600 μm, immerse it in an ammonium bicarbonate solution, wherein the ammonium bicarbonate solution is prepared by mixing ammonium bicarbonate powder and water in a mass ratio of 1-3:10, and react at 60° C. with stirring for 1-2 days; Step 2: filtering out the waste rubber powder soaked in ammonium bicarbonate, and performing a desulfurization reaction to obtain desulfurized rubber powder; Step 3: filtering out the Thermococcus thermophilic archaea fermentation liquid through a 0.22 μm microporous filter membrane, drying the filtered Thermococcus thermophilic archaea, mixing with anhydrous ethanol at a mass ratio of 1:20-30, reacting in a high-pressure homogenizer, soaking at 25-30° C. for 3-5 hours, filtering out the Thermococcus thermophilic archaea through a 0.22 μm microporous filter membrane, separating ethanol in the filtrate by distillation, and obtaining Thermococcus thermophilic archaea oil; Step 4: Mix the desulfurized rubber powder, Thermococcus thermophilic archaea oil and base asphalt in a mass ratio of 20-30:3-5:80-90, and shear and stir at 3500-4000 r / min for 10-13 min at 120-130° C. to obtain a desulfurized rubber modified asphalt product.

2. The method for preparing desulfurized rubber modified asphalt according to claim 1, characterized in that: The step 2 specifically includes: Step 21: preparing LB culture medium, inoculating activated heterotrophic nitrification-denitrifying bacteria into the LB culture medium, and culturing at 30-40° C. for 24-30 hours to obtain a heterotrophic nitrification-denitrifying bacteria solution; Step 22: Mix the heterotrophic nitrification-denitrification bacteria solution with the waste rubber powder in a mass ratio of 1:0.2, and react at 30-40° C. for 3-4 hours, then filter out the waste rubber powder, disinfect it, and set it aside; Step 23: adding culture medium, thermophilic archaea of ​​the genus Thermococcus and YPS culture medium into the fermentation tank, adding sodium chloride with a mass ratio of 4-5% into YPS, controlling the pH at 6.5-7, the temperature at 90-94° C., the stirring speed at 400-500 rpm, the pressure at 0.1-0.2 MPa, and reacting for 26-30 hours; Step 24: The waste rubber powder filtered out in step 22 is put into a closed fermentation tank, the mass ratio of waste rubber to YPS culture medium is 1:3-5, the pH is controlled at 6.5-7, the temperature is controlled at 90-94°C, the stirring speed is 400-500rpm, and the pressure is 0.1-0.2MPa. After reacting for 3-4 days, the waste rubber powder is filtered out and dried to obtain desulfurized rubber, and the filtrate is the fermentation liquid of thermophilic archaea of ​​the genus Thermococcus.

3. The method for preparing desulfurized rubber modified asphalt according to claim 2, characterized in that: The heterotrophic nitrification-denitrifying bacteria DNF23.

4. The method for preparing desulfurized rubber modified asphalt according to claim 2, characterized in that: The Thermococcus thermophilic archaeon is Thermococcus thermophilic archaeon HJ21.

5. The method for preparing desulfurized rubber modified asphalt according to claim 1, characterized in that: The waste rubber is selected from waste tire tread rubber.

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