Zinc ricinoleate and organic nano-montmorillonite odor-removing smoke-suppressing rubber asphalt and preparation method thereof

Abstract

The invention provides zinc diricinoleate and organic nano-montmorillonite odor-removing smoke-suppressing rubber asphalt and a preparation method thereof.The asphalt comprises petroleum asphalt, waste tire rubber powder, zinc diricinoleate, organic nano-montmorillonite, a stabilizer and furfural extract oil, and is prepared according to the following steps that 1, the petroleum asphalt is heated, and the mixture is stirred to be uniform; adding furfural extract oil, heating, mixing and shearing; (2) adding waste tire rubber powder, heating, mixing and shearing; (3) adding organic nano montmorillonite, heating, mixing and shearing; (4) adding zinc diricinoleate for heating, mixing and shearing; and (5) adding a stabilizer, heating, mixing and stirring. According to the invention, the organic nano montmorillonite and zinc diricinoleate are combined according to a certain proportion and are doped into the rubber asphalt, so that the smoke can be inhibited, and meanwhile, the foul odor can be reduced; the zinc diricinoleate can also reduce the viscosity problem caused by the organic nano montmorillonite, so that the rubber asphalt has better construction workability.

Description

Technical Field

[0001] The present invention belongs to the technical field of rubber asphalt, and specifically relates to an odorless and smoke-suppressing rubber asphalt containing zinc ricinoleate and organic nano-montmorillonite (OMMT), and also relates to a method for preparing an odorless and smoke-suppressing rubber asphalt by combining zinc ricinoleate and organic nano-montmorillonite (OMMT). Background Art

[0002] Adding waste tire rubber powder to asphalt to make rubber asphalt is an environmentally friendly and green choice. After high-temperature mixing and full swelling, rubber asphalt can improve the pavement performance of asphalt, reduce shock and noise, and enhance the high and low temperature performance of asphalt.

[0003] However, rubber asphalt releases a lot of toxic VOCs gases during heating, transportation and construction, and waste rubber powder will make its molecular sulfur bonds unstable under high temperatures, thereby releasing sulfur-containing compounds with a foul odor, causing great harm and impact to both the human body and the environment. Summary of the Invention

[0004] The purpose of the present invention is to provide a odor-free and smoke-suppressing rubber asphalt containing zinc ricinoleate and organic nano-montmorillonite, which solves the technical problems of large smoke release and unpleasant odor of rubber asphalt while ensuring the construction and workability of rubber asphalt.

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

[0006] The invention provides a zinc ricinoleate and organic nano-montmorillonite odor-free and smoke-suppressing rubber asphalt, which comprises the following components in parts by mass: 100 parts of petroleum asphalt, 20 parts of waste tire rubber powder, 1-2 parts of zinc ricinoleate, 1-2 parts of organic nano-montmorillonite, 0.02 parts of a stabilizer and 3 parts of furfural extracted oil.

[0007] Furthermore, the petroleum asphalt is road petroleum asphalt; the waste tire rubber powder is tire rubber powder that has been crushed and processed; the zinc ricinoleate is a zinc salt based on amino acid-activated ricinoleic acid; and the organic nano-montmorillonite is montmorillonite clay that has been subjected to exfoliation, dispersion, purification, modification, ultra-fine grading and organic compounding.

[0008] Furthermore, the stabilizer is obtained by mixing sulfur powder, asbestos ash, light calcium carbonate and carbon black.

[0009] Furthermore, the mass ratio of the sulfur powder, asbestos ash, light calcium carbonate and carbon black is 6:2:1:1.

[0010] The present invention also provides a method for preparing the above-mentioned odor-free and smoke-suppressing rubber asphalt containing zinc ricinoleate and organic nano-montmorillonite, comprising the following steps:

[0011] Step 1: heating petroleum asphalt, adding furfural to extract oil and heating, mixing and shearing;

[0012] Step 2, adding waste tire rubber powder to the product obtained in step 1 to heat, mix and shear;

[0013] Step 3, adding organic nano-montmorillonite to the product obtained in step 2 to perform heating, mixing and shearing;

[0014] Step 4, adding zinc ricinoleate to the product obtained in step 3 to perform heating, mixing and shearing;

[0015] Step 5: Add a stabilizer to the product obtained in step 4, and heat, mix and stir.

[0016] Furthermore, in the step 1, furfural is added to extract the oil when the mixture is heated to 110°C-145°C; the temperature for heating, mixing and shearing is 110°C-145°C, the rotation speed is 1000rpm-5000rpm, and the time is 10min-30min.

[0017] Furthermore, in step 2, the temperature for heating, mixing and shearing is 160° C.-180° C., the rotation speed is 1000 rpm-5000 rpm, and the time is 10 min-30 min.

[0018] Furthermore, in step 3, the temperature for heating, mixing and shearing is 160° C.-180° C., the rotation speed is 1000 rpm-5000 rpm, and the time is 20 min-60 min;

[0019] Furthermore, in step 4, the temperature for heating, mixing and shearing is 160° C.-180° C., the rotation speed is 1000 rpm-5000 rpm, and the time is 20 min-60 min;

[0020] Furthermore, in step 5, the temperature for heating, mixing and stirring is 160° C.-180° C., and the time is 100 min-200 min.

[0021] Rubber asphalt has excellent high-temperature performance and road performance, as well as good noise reduction capabilities, making it particularly suitable for urban road pavement. However, it releases significant smoke and odor during construction, seriously polluting the environment and impacting the health of construction workers. This study attempts to add organic nano-montmorillonite (OMMT) to rubber asphalt to create a modified asphalt that exhibits good smoke suppression and high-temperature resistance, but its deodorization performance is poor, and the rubber asphalt still has a strong pungent odor. Furthermore, the addition of OMMT significantly increases the rubber asphalt's construction viscosity, impairing its workability. The present invention deodorizes asphalt rubber by adding zinc ricinoleate. The activated zinc atoms in the zinc ricinoleate form strong hydrogen bonds with nitrogen and sulfur atoms in the odor, and through a "quasi-chelation" process, they form heavier molecules and complexes with lower vapor pressures. This inactivates the odor molecules, thereby eliminating the odor. Furthermore, the present invention combines zinc ricinoleate with organic nano-montmorillonite, which are incorporated into the asphalt rubber. The ratio of zinc ricinoleate to organic nano-montmorillonite is strictly controlled. This not only suppresses smoke emissions but also eliminates the odor of the asphalt rubber. Furthermore, the zinc ricinoleate effectively reduces the viscosity issues associated with the organic nano-montmorillonite, improving the workability of the asphalt rubber. This invention provides an effective deodorization and smoke suppression method for the environmentally friendly use of asphalt rubber.

[0022] The beneficial effects of the present invention are as follows: (1) the present invention combines organic nano-montmorillonite with zinc ricinoleate in a certain proportion and adds them to rubber asphalt, which can suppress smoke and reduce malodor while having significant environmental benefits; (2) the amount and cost of the zinc ricinoleate added in the present invention are both low, but it has a significant deodorizing effect and has significant economic benefits; (3) the zinc ricinoleate in the present invention can also reduce the viscosity problem caused by the organic nano-montmorillonite, so that the rubber asphalt has better construction and workability. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is the smoke concentration diagram;

[0024] Figure 2 It is the SO2 concentration release curve;

[0025] Figure 3 This is the H2S concentration release curve. DETAILED DESCRIPTION

[0026] The technical solution of the present invention is further described in detail below with reference to the embodiments.

[0027] Example 1

[0028] The invention discloses an odor-free and smoke-suppressing rubber asphalt containing zinc ricinoleate and organic nano-montmorillonite. The components thereof are as follows in parts by mass: 100 parts of petroleum asphalt, 20 parts of waste tire rubber powder, 2 parts of zinc ricinoleate, 2 parts of organic nano-montmorillonite, 0.02 parts of a stabilizer and 3 parts of furfural extracted oil.

[0029] The preparation method of the above-mentioned zinc ricinoleate and organic nano-montmorillonite odor-free and smoke-suppressing rubber asphalt is specifically implemented according to the following steps:

[0030] Step 1: heating the petroleum asphalt, and when heated to 140°C, adding furfural to extract the oil and heating, mixing and shearing. The heating, mixing and shearing temperature is 140°C, the rotation speed is 5000 rpm, and the shearing time is 20 minutes;

[0031] Step 2: adding waste tire rubber powder to the product obtained in step 1 and heating, mixing and shearing the mixture. The temperature for heating, mixing and shearing is 180° C., the rotation speed is 5000 rpm, and the shearing time is 10 min.

[0032] Step 3, adding organic nano-montmorillonite OMMT to the product obtained in step 2 for heating, mixing and shearing, wherein the heating, mixing and shearing temperature is 180° C., the rotation speed is 5000 rpm, and the shearing time is 20 min;

[0033] Step 4, adding zinc ricinoleate to the product obtained in step 3 for heating, mixing and shearing, wherein the heating, mixing and shearing temperature is 180° C., the rotation speed is 5000 rpm, and the shearing time is 20 min;

[0034] Step 5: Add a stabilizer to the product obtained in step 4, and heat, mix and stir. The temperature for heating, mixing and stirring is 180° C., and the stirring time is 180 minutes.

[0035] Example 2

[0036] The invention discloses an odor-free and smoke-suppressing rubber asphalt containing zinc ricinoleate and organic nano-montmorillonite. The components thereof are as follows in parts by mass: 100 parts of petroleum asphalt, 20 parts of waste tire rubber powder, 2 parts of zinc ricinoleate, 1 part of organic nano-montmorillonite, 0.02 parts of a stabilizer and 3 parts of furfural extracted oil.

[0037] The preparation method of the above-mentioned zinc ricinoleate and organic nano-montmorillonite odor-free and smoke-suppressing rubber asphalt is specifically implemented according to the following steps:

[0038] Step 1: heating the petroleum asphalt, and when heated to 110°C, adding furfural to extract the oil and heating, mixing and shearing. The heating, mixing and shearing temperature is 110°C, the rotation speed is 1000 rpm, and the shearing time is 10 minutes;

[0039] Step 2: adding waste tire rubber powder to the product obtained in step 1 and heating, mixing and shearing the mixture. The temperature for heating, mixing and shearing is 160° C., the rotation speed is 1000 rpm, and the shearing time is 10 min.

[0040] Step 3, adding organic nano-montmorillonite OMMT to the product obtained in step 2 for heating, mixing and shearing, wherein the heating, mixing and shearing temperature is 160° C., the rotation speed is 1000 rpm, and the shearing time is 60 min;

[0041] Step 4, adding zinc ricinoleate to the product obtained in step 3 for heating, mixing and shearing, wherein the heating, mixing and shearing temperature is 160° C., the rotation speed is 1000 rpm, and the shearing time is 60 min;

[0042] Step 5: Add a stabilizer to the product obtained in step 4, and heat, mix and stir. The temperature for heating, mixing and stirring is 180° C., and the stirring time is 100 minutes.

[0043] Example 3

[0044] The invention discloses an odor-free and smoke-suppressing rubber asphalt containing zinc ricinoleate and organic nano-montmorillonite. The components thereof are as follows in parts by mass: 100 parts of petroleum asphalt, 20 parts of waste tire rubber powder, 1 part of zinc ricinoleate, 2 parts of organic nano-montmorillonite, 0.02 parts of a stabilizer and 3 parts of furfural extracted oil.

[0045] The preparation method of the above-mentioned zinc ricinoleate and organic nano-montmorillonite odor-free and smoke-suppressing rubber asphalt is specifically implemented according to the following steps:

[0046] Step 1: heating the petroleum asphalt, adding furfural to extract the oil and heating, mixing and shearing the mixture at a temperature of 145°C, a rotation speed of 3000 rpm and a shearing time of 30 min;

[0047] Step 2: adding waste tire rubber powder to the product obtained in step 1 and heating, mixing and shearing the mixture. The temperature for heating, mixing and shearing is 170° C., the rotation speed is 3000 rpm, and the shearing time is 30 min.

[0048] Step 3, adding organic nano-montmorillonite OMMT to the product obtained in step 2 for heating, mixing and shearing, wherein the heating, mixing and shearing temperature is 170° C., the rotation speed is 3000 rpm, and the shearing time is 40 min;

[0049] Step 4, adding zinc ricinoleate to the product obtained in step 3 for heating, mixing and shearing, wherein the heating, mixing and shearing temperature is 170° C., the rotation speed is 3000 rpm, and the shearing time is 40 min;

[0050] Step 5: Add a stabilizer to the product obtained in step 4, and heat, mix and stir. The temperature for heating, mixing and stirring is 180° C., and the stirring time is 200 minutes.

[0051] Comparative Example 1

[0052] A zinc ricinoleate rubber asphalt comprises the following components in parts by mass: 100 parts of petroleum asphalt, 20 parts of waste tire rubber powder, 2 parts of zinc ricinoleate, 0.02 parts of a stabilizer and 3 parts of furfural extracted oil.

[0053] The preparation method of the zinc ricinoleate rubber asphalt is specifically implemented according to the following steps:

[0054] Step 1: heating the petroleum asphalt, and when heated to 145°C, adding furfural to extract the oil and heating, mixing and shearing. The heating, mixing and shearing temperature is 145°C, the rotation speed is 5000 rpm, and the shearing time is 30 minutes;

[0055] Step 2: adding waste tire rubber powder to the product obtained in step 1 and heating, mixing and shearing the mixture. The temperature for heating, mixing and shearing is 180° C., the rotation speed is 5000 rpm, and the shearing time is 30 min.

[0056] Step 3, adding zinc ricinoleate to the product obtained in step 2 for heating, mixing and shearing, wherein the heating, mixing and shearing temperature is 180° C., the rotation speed is 5000 rpm, and the shearing time is 60 min;

[0057] Step 4: Add a stabilizer to the product obtained in step 3, and heat, mix and stir. The temperature for heating, mixing and stirring is 180° C., and the stirring time is 120 minutes.

[0058] Comparative Example 2

[0059] The invention discloses an organic nano-montmorillonite rubber asphalt, whose components are as follows in parts by mass: 100 parts of petroleum asphalt, 20 parts of waste tire rubber powder, 2 parts of organic nano-montmorillonite, 0.02 parts of stabilizer and 3 parts of furfural extracted oil.

[0060] The preparation method of the organic nano-montmorillonite rubber asphalt is specifically implemented according to the following steps:

[0061] Step 1: heating the petroleum asphalt, and when heated to 145°C, adding furfural to extract the oil and heating, mixing and shearing. The heating, mixing and shearing temperature is 145°C, the rotation speed is 1000 rpm, and the shearing time is 30 minutes;

[0062] Step 2: adding waste tire rubber powder to the product obtained in step 1 and heating, mixing and shearing the mixture. The temperature for heating, mixing and shearing is 180° C., the rotation speed is 5000 rpm, and the shearing time is 30 min.

[0063] Step 3, adding organic nano-montmorillonite to the product obtained in step 2 for heating, mixing and shearing, wherein the heating, mixing and shearing temperature is 180° C., the rotation speed is 5000 rpm, and the shearing time is 60 min;

[0064] Step 4: Add a stabilizer to the product obtained in step 3, and heat, mix and stir. The temperature for heating, mixing and stirring is 180° C., and the stirring time is 120 minutes.

[0065] Comparative Example 3

[0066] A rubber asphalt comprises the following components in parts by mass: 100 parts of petroleum asphalt, 20 parts of waste tire rubber powder, 0.02 parts of a stabilizer and 3 parts of furfural extracted oil.

[0067] The preparation method of the rubber asphalt is specifically implemented according to the following steps:

[0068] Step 1: heating the petroleum asphalt, and when heated to 145°C, adding furfural to extract the oil and heating, mixing and shearing. The heating, mixing and shearing temperature is 145°C, the rotation speed is 1000 rpm, and the stirring time is 20 minutes;

[0069] Step 2: adding waste tire rubber powder to the product obtained in step 1 and heating, mixing and shearing the mixture. The temperature for heating, mixing and shearing is 180° C., the rotation speed is 4000 rpm, and the shearing time is 20 min.

[0070] Step 3: Add a stabilizer to the product obtained in step 2, and heat, mix, and stir. The temperature for heating, mixing, and stirring is 180° C., and the stirring time is 200 min.

[0071] The material indicators selected in Examples 1, 2, 3 and Comparative Examples 1, 2, 3 are as follows:

[0072] The petroleum asphalt is Jingbo 90# road petroleum asphalt.

[0073] Waste tire rubber powder is tire rubber powder that has been crushed and processed, and its properties are shown in Table 1.

[0074] Table 1 Technical indicators of 40-mesh waste tire rubber powder

[0075] Detection indicators unit Test results Technical requirements Bulk density kg / m3 1.24 1.10-1.30 Metal content % 0.007 <0.05 Fiber content % 0.057 <1.0 ash content % 7.0 ≤22 Acetone extract % 36 ≥24 Carbon black content % 6.45 ≤9

[0076] The selected zinc ricinoleate is a zinc salt based on amino acid activated ricinoleic acid, purchased from Hebei Hongda Chemical Co., Ltd., model BT-860, and its indicators are shown in Table 2.

[0077] Table 2 Performance indexes of zinc ricinoleate

[0078] project unit Index requirements Measured value Appearance - White to slightly yellow powder White soft powder moisture % ≤5 3.5 Zinc ion content % 9.5-10.5 10 PH - 6-8 7 Particle size (over 200 mesh) Head ≥95 96 Effective content of zinc ricinoleate % ≥95 99

[0079] The selected organic nano-montmorillonite is montmorillonite clay that has been subjected to exfoliation, dispersion, purification, modification, ultrafine fractionation and special organic compounding. It is purchased from Zhejiang Huate New Materials Co., Ltd. and is a BP-183 type organic nano-montmorillonite. Its indicators are shown in Table 3.

[0080] Table 3 Performance indexes of organic nano-montmorillonite

[0081] Appearance Light yellow, flowable powder Volatile matter (105℃, 2 hours) ≤3.5% Particle size (over 200 mesh) ≥96% Specific gravity (25℃) 1.65 Bulk density (Kg / m3) 511 Loss on ignition (850~900℃) ≤39% <![CDATA[Specific surface area (m 2 / g)]]> 750 Diameter-to-thickness ratio 200

[0082] Among the stabilizers, industrial sulfur is used, and its specifications meet the requirements of first-class products or above in (GB / T2449-2006). It is obtained by mixing sulfur powder, asbestos ash, light calcium carbonate, and carbon black in a mass ratio of 60:20:10:10.

[0083] The selected furfural extracted oil was provided by Lanzhou Refinery. It is brown-black in color and has an aromatic fragrance content of 55%. The purpose is to improve the asphalt colloid structure and optimize the high and low temperature performance of asphalt.

[0084] Smoke and odor tests were conducted on the rubber asphalt prepared in Examples 1, 2, 3 and Comparative Examples 1, 2, and 3. The smoke detection instrument used was the MP18X series handheld VOC rapid detector produced by Shanghai Mengpuan Electronics Co., Ltd. It uses a 10.6eV photoionization sensor and a pump-suction automatic sampling method, which is highly efficient and accurate in detecting VOCs. The smoke released was tested in real time for 40 minutes, and the instrument recorded the concentration every 10 seconds. The measured smoke concentration is shown in the figure below. Figure 1 As shown, Examples 1, 2, 3 and Comparative Example 2 have good smoke suppression effects after adding organic nano-montmorillonite, while Comparative Example 1 with only zinc ricinoleate added and Comparative Example 3 without adding organic nano-montmorillonite and zinc ricinoleate have higher VOCs release concentrations.

[0085] from Figure 1 It can be seen that the addition of organic nano-montmorillonite reduces the VOCs of the rubber asphalt to a certain extent. However, the rubber asphalt without the addition of zinc ricinoleate still has a strong odor. Therefore, SO2 and H2S concentrations were measured using a dedicated instrument, and the concentrations are shown in Table 4. As shown in Table 4, the SO2 and H2S concentrations of Examples 1, 2, and 3, as well as Comparative Example 1, which added castor oil acid, were significantly lower than those of Comparative Examples 2 and 3, which did not add castor oil acid.

[0086] Table 4 VOCs, SO2 and H2S concentrations

[0087] pilot projects <![CDATA[VOCs(mg / m 3 )]]> <![CDATA[SO2(PPM)]]> <![CDATA[H2S(PPM)]]> Implementation Example 1 128.7 17.4 2.7 Implementation Example 2 151.5 17.5 4 Implementation Example 3 110.9 51.5 16 Comparative Example 1 303.7 14 1.5 Comparative Example 2 150.2 117.2 22.6 Comparative Example 3 485.2 97.8 18.7

[0088] The SO2 and H2S concentration release curves are shown in the figure below. Figure 2 、 Figure 3 As shown. After the addition of zinc ricinoleate, the release concentrations of SO2 and H2S decreased by an order of magnitude, demonstrating excellent deodorization effectiveness. The above test results demonstrate that the odor- and smoke-suppressing rubber asphalt containing zinc ricinoleate and organic nano-montmorillonite of the present invention exhibits excellent odor- and smoke-suppressing properties against the malodorous gases SO2, H2S, and VOCs (i.e., the best odor- and smoke-suppressing properties). Example 1, in which two parts of zinc ricinoleate and two parts of organic nano-montmorillonite were added simultaneously, exhibited the best overall odor- and smoke-suppressing properties (with the lowest VOCs, SO2, and H2S releases).

[0089] As shown in Table 5, Comparative Example 1, in which two parts of zinc ricinoleate were added alone, achieved the lowest rotational viscosity and the best workability. In Comparative Example 2, however, the rubber asphalt with two parts of organic nano-montmorillonite added alone exhibited a significant increase in workability. Finally, as can be seen from Example 1, the rubber asphalt with both two parts of zinc ricinoleate and two parts of organic nano-montmorillonite achieved a rotational viscosity close to that of the rubber asphalt in Comparative Example 1, demonstrating superior workability. This demonstrates that zinc ricinoleate effectively reduces the viscosity issues associated with organic nano-montmorillonite, resulting in improved workability and workability for the odor- and smoke-suppressing rubber asphalt.

[0090] Table 5 Construction performance table

[0091] pilot projects Rotational viscosity (180℃ / mpa·s) Implementation Example 1 2750 Implementation Example 2 2688 Implementation Example 3 2883 Comparative Example 1 2537 Comparative Example 2 3133 Comparative Example 3 2989

Claims

1. A zinc ricinoleate and organic nano-montmorillonite odor-free and smoke-suppressing rubber asphalt, characterized in that: The invention comprises the following components in parts by mass: 100 parts of petroleum asphalt, 20 parts of waste tire rubber powder, 1-2 parts of zinc ricinoleate, 1-2 parts of organic nano-montmorillonite, 0.02 parts of stabilizer and 3 parts of furfural extracted oil.

2. The odor-free and smoke-suppressing rubber asphalt prepared with zinc ricinoleate and organic nano-montmorillonite according to claim 1, characterized in that: The petroleum asphalt is road petroleum asphalt; the waste tire rubber powder is tire rubber powder that has been crushed and processed; the zinc ricinoleate is a zinc salt composed of ricinoleic acid activated by amino acids; and the organic nano-montmorillonite is montmorillonite clay that has been subjected to exfoliation, dispersion, purification, modification, ultra-fine grading and organic compounding.

3. The odor-free and smoke-suppressing rubber asphalt prepared with zinc ricinoleate and organic nano-montmorillonite according to claim 1, characterized in that: The stabilizer is obtained by mixing sulfur powder, asbestos ash, light calcium carbonate and carbon black.

4. The odor-free and smoke-suppressing rubber asphalt prepared with zinc ricinoleate and organic nano-montmorillonite according to claim 3, characterized in that: The mass ratio of the sulfur powder, asbestos ash, light calcium carbonate and carbon black is 6:2:1:

1.

5. A method for preparing the odor-free and smoke-suppressing rubber asphalt containing zinc ricinoleate and organic nano-montmorillonite according to claim 1, characterized in that: The following steps are involved: Step 1: heating petroleum asphalt, adding furfural to extract oil and heating, mixing and shearing; Step 2, adding waste tire rubber powder to the product obtained in step 1 to heat, mix and shear; Step 3, adding organic nano-montmorillonite to the product obtained in step 2 to perform heating, mixing and shearing; Step 4, adding zinc ricinoleate to the product obtained in step 3 to perform heating, mixing and shearing; Step 5: Add a stabilizer to the product obtained in step 4, and heat, mix and stir.

6. The preparation method according to claim 5, characterized in that: In the step 1, furfural is added to extract the oil when the mixture is heated to 110° C.-145° C.; the temperature for heating, mixing and shearing is 110° C.-145° C., the rotation speed is 1000 rpm-5000 rpm, and the time is 10 min-30 min.

7. The preparation method according to claim 5, characterized in that: In step 2, the temperature for heating, mixing and shearing is 160° C.-180° C., the rotation speed is 1000 rpm-5000 rpm, and the time is 10 min-30 min.

8. The preparation method according to claim 5, characterized in that: In step 3, the temperature for heating, mixing and shearing is 160° C.-180° C., the rotation speed is 1000 rpm-5000 rpm, and the time is 20 min-60 min.

9. The preparation method according to claim 5, characterized in that: In step 4, the temperature for heating, mixing and shearing is 160° C.-180° C., the rotation speed is 1000 rpm-5000 rpm, and the time is 20 min-60 min.

10. The preparation method according to claim 5, characterized in that: In step 5, the temperature for heating, mixing and stirring is 160° C.-180° C., and the time is 100 min-200 min.

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