Method for detecting activation degree of desulfurized rubber powder

Abstract

The present application belongs to the technical field of road engineering application, and particularly relates to a detection method for the activation degree of desulfurized rubber powder. A standard curve is obtained by establishing a linear relationship curve between a standard integral area ratio and the activation degree, the standard integral area ratio being the ratio of the integral area of a mixed standard sample ductility curve to the area of a matrix asphalt ductility curve, and the mixed standard sample being a mixture of a desulfurized rubber powder standard and matrix asphalt. The integral area of a mixed sample ductility curve to be detected and the integral area of a matrix asphalt ductility curve are obtained according to the ductility curve of the desulfurized rubber powder to be detected and the ductility curve of the matrix asphalt. The integral area of the mixed sample ductility curve to be detected is divided by the integral area of the matrix asphalt ductility curve to obtain a detected integral area ratio. The detected integral area ratio is brought into the standard curve to quickly detect the activation degree of the desulfurized rubber powder, greatly shortening the detection time. The detection method provided by the present application is quick, convenient and has high accuracy.

Description

Technical Field

[0001] This invention belongs to the field of road engineering application technology, and specifically relates to a method for detecting the activation degree of desulfurized rubber powder. Background Technology

[0002] With social development, rubber consumption is gradually increasing, and the amount of waste rubber generated is also increasing. However, recycling waste rubber reduces environmental pollution and improves resource utilization. The production process of reclaimed rubber is as follows: waste rubber - cutting - washing - coarse crushing - fine crushing - sieving - separation of fibers and metal impurities - desulfurization - washing - pressing with water - drying - kneading - filtering - reprocessing - refining - finished sheeting. Among these, the desulfurization process is a major step in the reclaimed rubber production process and is crucial to the quality of the reclaimed rubber product. The activation degree of the desulfurized rubber powder is an important indicator of the degree of desulfurization of the rubber.

[0003] Currently, the activation degree of desulfurized rubber powder is mainly determined according to GB / T 3516-2006, but this method is time-consuming and has low efficiency. It takes at least 24 hours to test one sample. Summary of the Invention

[0004] In view of this, the present invention provides a method for detecting the activation degree of desulfurized rubber powder. The detection method provided by the present invention can quickly determine the activation degree of desulfurized rubber powder and greatly shorten the detection time.

[0005] To address the aforementioned technical problems, this invention provides a method for detecting the activation degree of desulfurized rubber powder, comprising the following steps:

[0006] The desulfurized rubber powder and base asphalt to be tested were mixed to obtain the mixed sample to be tested;

[0007] Ductility specimens were prepared from the mixed sample to be tested and the base asphalt, respectively, to obtain the ductility specimen to be tested and the base ductility specimen;

[0008] Under the same conditions, the test specimens and matrix ductility specimens were subjected to force-ductility tests to obtain the force-ductility curves of the mixed sample and the matrix asphalt.

[0009] Divide the integral area of ​​the force ductility curve of the mixed sample to be tested by the integral area of ​​the force ductility curve of the base asphalt to obtain the integral area ratio of the sample to be tested.

[0010] The degree of activation of the desulfurized rubber powder to be tested is calculated by substituting the integral area ratio of the test sample into the standard curve. The standard curve is a linear relationship curve between the degree of activation and the standard integral area ratio. The standard integral area ratio is the ratio of the integral area of ​​the ductility curve of the mixed standard sample to the integral area of ​​the ductility curve of the base asphalt. The mixed standard sample is a mixture of desulfurized rubber powder standard and base asphalt.

[0011] Preferably, the temperature for the force-ductility test is 4.8–5.2°C.

[0012] Preferably, the mass ratio of the desulfurized rubber powder to the base asphalt is 1:4 to 6.

[0013] Preferably, the mixing is carried out under stirring conditions; the stirring temperature is 185-195°C, and the stirring speed is 3000-5000 r / min.

[0014] Preferably, the method for obtaining the standard curve includes the following steps:

[0015] Provide standard samples of desulfurized rubber powder with known activation levels;

[0016] The desulfurized rubber powder standard sample and the base asphalt were mixed first to obtain a mixed standard sample;

[0017] Ductility specimens were prepared using the mixed standard sample and the base asphalt, respectively, to obtain standard ductility specimens and base ductility specimens;

[0018] Under the same conditions, force-ductility tests were performed on the standard ductility specimen and the matrix ductility specimen to obtain the force-ductility curve of the mixed standard sample and the force-ductility curve of the matrix asphalt.

[0019] The standard integral area ratio is obtained by dividing the integral area of ​​the mixed standard sample ductility curve by the integral area of ​​the base asphalt ductility curve.

[0020] The activation degree and standard integral area ratio of the desulfurized rubber powder standard sample were fitted to obtain the standard curve.

[0021] Preferably, the activation degree of the desulfurized rubber powder standard sample is 10-80%.

[0022] Preferably, the fitting method is the least partial squares method.

[0023] Preferably, the method for preparing the sulfurized rubber powder standard sample includes the following steps:

[0024] The extracted oil and desulfurizing agent are mixed to obtain a desulfurizing agent solution;

[0025] The desulfurizing agent solution and rubber powder are mixed and then developed to obtain rubber powder to be desulfurized;

[0026] The desulfurized rubber powder is extruded using a screw extruder to obtain a standard sample of desulfurized rubber powder.

[0027] Preferably, the extrusion temperature is 200–280°C.

[0028] Preferably, the mass ratio of the extracted oil to the rubber powder is 5.8–6.2:100;

[0029] The mass ratio of the desulfurizing agent to the rubber powder is 0.8–1.2:100.

[0030] This invention provides a method for detecting the activation degree of desulfurized rubber powder, comprising the following steps: mixing the desulfurized rubber powder to be tested with base asphalt to obtain a mixed sample to be tested; preparing ductility specimens for the mixed sample to be tested and the base asphalt respectively to obtain a ductility specimen to be tested and a base ductility specimen; performing force-ductility tests on the ductility specimen to be tested and the base ductility specimen under the same conditions to obtain a force-ductility curve for the mixed sample to be tested and a force-ductility curve for the base asphalt; dividing the integral area of ​​the force-ductility curve of the mixed sample to be tested by the integral area of ​​the force-ductility curve of the base asphalt to obtain the integral area ratio to be tested; substituting the integral area ratio to be tested into a standard curve to calculate the activation degree of the desulfurized rubber powder to be tested, wherein the standard curve is a linear relationship curve between the activation degree and the standard integral area ratio, and the standard integral area ratio is the ratio of the integral area of ​​the force-ductility curve of the mixed standard sample to the integral area of ​​the force-ductility curve of the base asphalt, wherein the mixed standard sample is a mixture of desulfurized rubber powder standard and base asphalt. This invention establishes a quantitative analysis standard curve based on the force-ductility curve to determine the activation degree of desulfurized rubber powder and its integral area ratio. The activation degree of the desulfurized rubber powder can be rapidly determined based on the integral area ratio, significantly shortening the detection time. The detection method provided by this invention is fast, convenient, and highly accurate, while also protecting the health of testing personnel. Attached Figure Description

[0031] Figure 1 This is a force ductility curve of the mixed standard sample in Example 1;

[0032] Figure 2 This is the standard curve graph from Example 1;

[0033] Figure 3 This is a correlation curve between the calculated activation value and the experimental activation value in Example 2;

[0034] Figure 4 This is a graph showing the relative error distribution range between the calculated activation value and the experimental activation value in Example 2. Detailed Implementation

[0035] This invention provides a method for detecting the activation degree of desulfurized rubber powder, comprising the following steps:

[0036] The desulfurized rubber powder and base asphalt to be tested were mixed to obtain the mixed sample to be tested;

[0037] Ductility specimens were prepared from the mixed sample to be tested and the base asphalt, respectively, to obtain the ductility specimen to be tested and the base asphalt ductility specimen.

[0038] Under the same conditions, the test specimens and matrix ductility specimens were subjected to force-ductility tests to obtain the force-ductility curves of the mixed sample and the matrix asphalt.

[0039] Divide the integral area of ​​the force ductility curve of the mixed sample to be tested by the integral area of ​​the force ductility curve of the base asphalt to obtain the integral area ratio of the sample to be tested.

[0040] The degree of activation of the desulfurized rubber powder to be tested is calculated by substituting the integral area ratio of the test sample into the standard curve. The standard curve is a linear relationship curve between the degree of activation and the standard integral area ratio. The standard integral area ratio is the ratio of the integral area of ​​the ductility curve of the mixed standard sample to the integral area of ​​the ductility curve of the base asphalt. The mixed standard sample is a mixture of desulfurized rubber powder standard and base asphalt.

[0041] This invention involves mixing desulfurized rubber powder and base asphalt to obtain a mixed sample. In this invention, the preferred mass ratio of the desulfurized rubber powder to the base asphalt is 1:4 to 6, more preferably 1:5. In this invention, the mixing is preferably carried out under stirring conditions; the stirring temperature is preferably 185 to 195°C, more preferably 190°C; the stirring speed is preferably 3000 to 5000 r / min, more preferably 4000 to 4500 r / min. This invention does not have special requirements for the stirring time, as long as the mixture is homogeneous.

[0042] After obtaining the mixed sample to be tested, the present invention prepares ductility specimens from the mixed sample and the base asphalt, respectively, to obtain the ductility specimen to be tested and the base asphalt ductility specimen. The present invention has no special requirements for the method of preparing the ductility specimens; conventional methods in the art can be used.

[0043] After obtaining the ductility test specimen and the matrix ductility test specimen, the present invention performs force-ductility tests on the specimen and the matrix ductility test specimen under the same conditions to obtain the force-ductility curve of the mixed sample and the force-ductility curve of the matrix asphalt. In the present invention, the temperature of the force-ductility test is preferably 4.8-5.2℃, more preferably 5℃.

[0044] After obtaining the force ductility curve of the mixed sample to be tested and the force ductility curve of the base asphalt, the present invention divides the integral area of ​​the force ductility curve of the mixed sample to be tested by the integral area of ​​the force ductility curve of the base asphalt to obtain the integral area ratio of the mixed sample to be tested.

[0045] After obtaining the integral area ratio to be tested, this invention substitutes the integral area ratio into a standard curve to calculate the activation degree of the desulfurized rubber powder to be tested. The horizontal axis of the standard curve represents the activation degree, and the vertical axis represents the integral area ratio. In this invention, the method for obtaining the standard curve preferably includes the following steps:

[0046] Provide standard samples of desulfurized rubber powder with known activation levels;

[0047] The desulfurized rubber powder standard sample and the base asphalt were mixed first to obtain a mixed standard sample;

[0048] Ductility specimens were prepared using the mixed standard sample and the base asphalt, respectively, to obtain standard ductility specimens and base ductility specimens;

[0049] Under the same conditions, force-ductility tests were performed on the standard ductility specimen and the matrix ductility specimen to obtain the force-ductility curve of the mixed standard sample and the force-ductility curve of the matrix asphalt.

[0050] The standard integral area ratio is obtained by dividing the integral area of ​​the mixed standard sample ductility curve by the integral area of ​​the base asphalt ductility curve.

[0051] The activation degree and standard integral area ratio of the desulfurized rubber powder standard sample were fitted to obtain the standard curve.

[0052] This invention provides a standard sample of desulfurized rubber powder with a known degree of activation. In this invention, the preparation method of the desulfurized rubber powder standard sample preferably includes the following steps:

[0053] The extracted oil and desulfurizing agent are mixed to obtain a desulfurizing agent solution;

[0054] The desulfurizing agent solution and rubber powder are mixed and then developed to obtain rubber powder to be desulfurized;

[0055] The desulfurized rubber powder is extruded using a screw extruder to obtain a standard sample of desulfurized rubber powder.

[0056] This invention mixes extracted oil and a desulfurizing agent to obtain a desulfurizing agent solution. In this invention, the desulfurizing agent preferably includes activator 490, activator 560, activator 480, dibenzyl disulfide, or tetramethylthiuram disulfide (TMTD), more preferably dibenzyl disulfide. In this invention, activator 490, activator 560, and activator 480 are all conventional rubber activating agents in the art. In this invention, the mass ratio of extracted oil to rubber powder is preferably 5.8–6.2:100, more preferably 6:100. In this invention, the mass ratio of desulfurizing agent to rubber powder is preferably 0.8–1.2:100, more preferably 1:100.

[0057] In this invention, the mixing is preferably carried out under stirring conditions, the stirring temperature is preferably 60-70°C, more preferably 65-68°C; the stirring speed is preferably 3000-5000 r / min, more preferably 3500-4500 r / min. This invention does not have special requirements for the stirring time, as long as the mixture is homogeneous.

[0058] After obtaining the desulfurizing agent solution, the present invention mixes the desulfurizing agent solution with rubber powder and then develops the mixture to obtain the rubber powder to be desulfurized. In this invention, the mixing is preferably carried out under stirring conditions, and the stirring speed is preferably 3000–5000 r / min, more preferably 4000–4500 r / min. The present invention has no special requirements for the stirring time, as long as the mixture is homogeneous. In this invention, the development is preferably carried out under static conditions, and the development time is preferably 22–26 hours, more preferably 24 hours.

[0059] After obtaining the rubber powder to be desulfurized, this invention uses a screw extruder to extrude the rubber powder to obtain a desulfurized rubber powder standard sample. In this invention, the screw extruder is preferably a twin-screw extruder. In this invention, the extrusion temperature is preferably 200–300°C, more preferably 220–280°C, and even more preferably 220–3260°C. In this invention, the extrusion temperature determines the activation degree of the desulfurized rubber powder standard sample.

[0060] In this invention, the number of desulfurized rubber powder standard samples is preferably 3 to 6, more preferably 5. The difference in extrusion temperature for preparing each desulfurized rubber powder standard sample is preferably 18 to 22°C, more preferably 20°C. The use of the above-specified number of desulfurized rubber powder standard samples allows for good fitting and the generation of a standard curve.

[0061] The present invention preferably tests the activation degree of desulfurized rubber powder standard samples according to GB / T 3516-2006. The present invention preferably tests according to Test Method A in GB / T 3516-2006. In the present invention, the activation degree of the desulfurized rubber powder standard samples is preferably 10-80%, more preferably 20-60%.

[0062] GB / T 3516-2006 is the national standard for the determination of solvent extracts from rubber. Currently, the activation degree of desulfurized rubber powder is mainly tested according to GB / T 3516-2006.

[0063] This invention involves first mixing the desulfurized rubber powder standard sample and the base asphalt to obtain a mixed standard sample. In this invention, the mass ratio of the desulfurized rubber powder standard sample to the base asphalt is preferably 1:4 to 6, more preferably 1:5. In this invention, the first mixing is preferably carried out under stirring conditions; the stirring temperature is preferably 185 to 195°C, more preferably 190°C; the stirring speed is preferably 3000 to 5000 r / min, more preferably 3500 to 4200 r / min. This invention does not have special requirements for the stirring speed, as long as it ensures uniform mixing.

[0064] After obtaining the mixed standard sample, the present invention uses the mixed standard sample and the base asphalt to prepare ductility specimens, resulting in standard ductility specimens and base ductility specimens. The present invention does not have special requirements for the method of preparing the ductility specimens; conventional methods in the art can be used.

[0065] After obtaining the standard ductility specimen and the matrix ductility specimen, the present invention performs force-ductility tests on the standard ductility specimen and the matrix asphalt specimen under the same conditions to obtain the force-ductility curve of the mixed standard sample and the force-ductility curve of the matrix asphalt. In the present invention, the temperature of the force-ductility test is preferably 4.8 to 5.2°C, more preferably 5°C.

[0066] After obtaining the force ductility curve of the mixed standard sample and the force ductility curve of the base asphalt, the present invention uses the integral area of ​​the force ductility curve of the mixed standard sample divided by the integral area of ​​the force ductility curve of the base asphalt to obtain the standard integral area ratio.

[0067] After obtaining the activation degree and standard integral area ratio, this invention fits the data of the activation degree and standard integral area ratio of the desulfurized rubber powder standard sample to obtain a standard curve. In this invention, the fitting method is preferably the least partial squares method.

[0068] The detection method provided by this invention, after obtaining the standard curve, only requires performing a force-ductility test on the desulfurized rubber powder and base asphalt to obtain the force-ductility curve. The area ratio of the test component is then calculated by integrating the area ratio. Substituting this area ratio into the standard curve yields the activation degree of the desulfurized rubber powder. This shortens the detection time for determining the activation degree of desulfurized rubber powder and better protects the health of testing personnel.

[0069] To further illustrate the present invention, the technical solutions provided by the present invention will be described in detail below with reference to the embodiments, but they should not be construed as limiting the scope of protection of the present invention.

[0070] Example 1

[0071] Extracted oil and activator 480 (desulfurizer) were stirred at 65℃ and 3500 r / min to obtain a desulfurizer solution. The desulfurizer solution and rubber powder were stirred evenly at 4000 r / min and allowed to develop (stand still) for 24 h to obtain rubber powder to be desulfurized. The mass ratio of extracted oil to rubber powder was 6:100, and the mass ratio of desulfurizer to rubber powder was 1:100. The rubber powder to be desulfurized was extruded using a twin-screw extruder at extrusion temperatures of 200℃, 220℃, 240℃, 260℃, and 280℃ to obtain 5 standard samples of desulfurized rubber powder.

[0072] The activation levels of five desulfurized rubber powder standard samples were tested according to GB / T 3516-2006 and were 17.59%, 26.26%, 32.58%, 46.72%, and 52.4%, respectively.

[0073] Five desulfurized rubber powder standard samples and base asphalt were mixed evenly at a mass ratio of 1:5 at a temperature of 190℃ and a rotation speed of 4000r / min to obtain five mixed standard samples, which were respectively designated as the first mixed standard sample, the second mixed standard sample, the third mixed standard sample, the fourth mixed standard sample and the fifth mixed standard sample.

[0074] Five mixed standard samples were used to prepare ductility specimens, resulting in five standard ductility specimens. Force-ductility tests were performed on the five standard ductility specimens to obtain the force-ductility curve of the mixed standard samples.

[0075] Ductility specimens were prepared using base asphalt to obtain base ductility specimens; force-ductility tests were performed to obtain the force-ductility curve of the base asphalt.

[0076] Divide the integral area of ​​the force ductility curves of the five mixed standard samples by the integral area of ​​the force ductility curve of the base asphalt to obtain the integral area ratios of the five standards.

[0077] The activation degree and standard integral area ratio of the desulfurized rubber powder standard sample were fitted using the least partial squares method to obtain the standard curve: y = 0.449x - 2.213, and the R² of the standard curve was... 2 =0.992;

[0078] The desulfurized rubber powder and base asphalt to be tested were homogenized at a mass ratio of 1:5 at a temperature of 190℃ and a rotation speed of 4000 r / min to obtain the mixed sample to be tested.

[0079] A ductility test specimen is prepared using the mixed sample to be tested to obtain the ductility test specimen; a force-ductility test is performed on the ductility test specimen to obtain the ductility curve of the mixed sample to be tested;

[0080] Divide the integral area of ​​the ductility curve of the mixed sample to be tested by the integral area of ​​the ductility curve of the base asphalt to obtain the integral area ratio of the sample to be tested.

[0081] The activation degree of the desulfurized rubber powder to be tested is calculated by substituting the integral area ratio of the test sample into the standard curve.

[0082] The results of the integral area of ​​the force ductility curves of the five mixed standard samples, the integral area of ​​the force ductility curve of the base asphalt, and the ratio of the five integral areas in Example 1 are listed in Table 1.

[0083] Table 1. Relevant data on the integral area of ​​the standard sample in Example 1.

[0084]

[0085] The force ductility curve of the mixed standard sample in Example 1 is as follows: Figure 1 As shown.

[0086] The standard curve in Example 1 is as follows: Figure 2 As shown.

[0087] Example 2

[0088] Using 40-mesh raw rubber powder produced by Gansu Wuwei Xinhaoyuan Environmental Protection Technology Co., Ltd. as raw material, 240g of extracted oil and 40g of activator 480 (desulfurizer) were mixed at 65℃ to obtain a desulfurizer solution. The desulfurizer solution and 4000g of raw rubber powder were mixed at a speed of 3500r / min and allowed to develop for 24 hours. The developed product was extruded using a screw extruder to obtain 5 samples of desulfurized rubber powder to be tested, referred to as No. 1, No. 2, No. 3, No. 4 and No. 5, respectively. The extrusion temperature of No. 1 was 200℃; the extrusion temperature of No. 2 was 220℃; the extrusion temperature of No. 3 was 240℃; the extrusion temperature of No. 4 was 260℃; and the extrusion temperature of No. 5 was 280℃.

[0089] The activation degree of five samples of desulfurized rubber powder were tested according to the method in Example 1, and the results are listed in Table 2.

[0090] The activation degree of the five desulfurized rubber powders was tested according to Test Method A in GB / T 3516-2006, and the results are listed in Table 2.

[0091] Table 2. Relevant data from Example 2

[0092]

[0093] The correlation graph between the calculated activation value and the experimental activation value in Example 2 is shown below. Figure 3 As shown; the relative error graph between the calculated activation value and the experimental activation value is shown in the figure. Figure 4 As shown.

[0094] The R-curve of the correlation between the calculated activation degree and the experimental activation degree in this invention 2 A value greater than 0.99 indicates a good correlation between the calculated activation degree value and the experimental activation degree value, proving that the detection method provided by this invention can accurately detect the activation degree of desulfurized rubber powder.

[0095] Combine Table 2 and Figure 4 It can be seen that the relative error between the calculated activation value and the experimental activation value is within ±1.5%, proving that the detection method provided by this invention can accurately detect the activation degree of desulfurized rubber powder.

[0096] The force-ductility analyzer involved in the detection method provided by this invention is simple to operate, highly accurate, and provides reliable data. It does not require any chemical reagents, such as acetone or trichloroethylene. The activation degree of the sample can be quickly determined simply by collecting the force-ductility curve of the sample to be tested.

[0097] Although the above embodiments have provided a detailed description of the present invention, they are only some embodiments of the present invention, and not all embodiments. People can obtain other embodiments based on these embodiments without creative effort, and these embodiments all fall within the protection scope of the present invention.

Claims

1. A method for detecting the activation degree of desulfurized rubber powder, comprising the following steps: The desulfurized rubber powder and base asphalt to be tested were mixed to obtain the mixed sample to be tested; The mass ratio of the desulfurized rubber powder to the base asphalt is 1:4~6; the mixing is carried out under stirring conditions; the stirring temperature is 185~195℃, and the stirring speed is 3000~5000r / min; Ductility specimens were prepared from the mixed sample to be tested and the base asphalt, respectively, to obtain the ductility specimen to be tested and the base ductility specimen; Under the same conditions, the test specimens for ductility and the matrix ductility were subjected to force-ductility tests to obtain the force-ductility curves of the mixed sample and the matrix asphalt; the temperature for the force-ductility test was 4.8~5.2℃. Divide the integral area of ​​the force ductility curve of the mixed sample to be tested by the integral area of ​​the force ductility curve of the base asphalt to obtain the integral area ratio of the sample to be tested. The activation degree of the desulfurized rubber powder is calculated by substituting the measured integral area ratio into the standard curve. The standard curve is a linear relationship curve between the activation degree and the standard integral area ratio. The standard integral area ratio is the ratio of the integral area of ​​the ductility curve of the mixed standard sample to the integral area of ​​the ductility curve of the base asphalt. The mixed standard sample is a mixture of the desulfurized rubber powder standard sample and the base asphalt. The activation degree of the desulfurized rubber powder standard sample is 10~80%.

2. The detection method according to claim 1, characterized in that, The method for obtaining the standard curve includes the following steps: Provide standard samples of desulfurized rubber powder with known activation levels; The desulfurized rubber powder standard sample and the base asphalt were mixed first to obtain a mixed standard sample; Ductility specimens were prepared using the mixed standard sample and the base asphalt, respectively, to obtain standard ductility specimens and base ductility specimens; Under the same conditions, force-ductility tests were performed on the standard ductility specimen and the matrix ductility specimen to obtain the force-ductility curve of the mixed standard sample and the force-ductility curve of the matrix asphalt. The standard integral area ratio is obtained by dividing the integral area of ​​the mixed standard sample ductility curve by the integral area of ​​the base asphalt ductility curve. The activation degree and standard integral area ratio of the desulfurized rubber powder standard sample were fitted to obtain the standard curve.

3. The detection method according to claim 2, characterized in that, The fitting method is the least partial squares method.

4. The detection method according to claim 1 or 2, characterized in that, The preparation method of the desulfurized rubber powder standard sample includes the following steps: The extracted oil and desulfurizing agent are mixed to obtain a desulfurizing agent solution; The desulfurizing agent solution and rubber powder are mixed and then developed to obtain rubber powder to be desulfurized; The desulfurized rubber powder is extruded using a screw extruder to obtain a standard sample of desulfurized rubber powder.

5. The detection method according to claim 4, characterized in that, The extrusion temperature is 200~280℃.

6. The detection method according to claim 4, characterized in that, The mass ratio of the extracted oil to the rubber powder is 5.8~6.2:100; The mass ratio of the desulfurizing agent to the rubber powder is 0.8~1.2:100.

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