Asphalt regeneration agent and preparation method thereof

Abstract

The present invention relates to the technical field of asphalt regeneration, and in particular to an asphalt regeneration agent and a preparation method thereof, wherein the asphalt regeneration agent is composed of the following raw materials: 45-55 parts of purified waste oil, 10-15 parts of furfural emulsified oil, 10-15 parts of methyl carbamate, 10-15 parts of waste rubber powder, 3-6 parts of mica powder, and 2-4 parts of modified fiber. The present invention firstly uses waste oil as the main preparation raw material to achieve the reuse of waste resources and effectively reduce costs; secondly, the original system of aged asphalt is broken through the emulsification effect of furfural emulsified oil and the polar effect of methyl carbamate, so that components such as waste oil, furfural extracted oil, and mica powder are redissolved, and the proportion of each component is rebalanced, while improving the stability and strength of the regenerated asphalt.

Description

Technical Field

[0001] The present invention relates to the technical field of asphalt regeneration, and more specifically, to an asphalt regeneration agent and a preparation method thereof. Background Art

[0002] Asphalt pavement recycling technology is a process of mixing new asphalt, new mineral materials and a certain amount of old asphalt mixture at a high temperature of 170-180℃, and then paving and rolling to form an asphalt pavement. In recent years, asphalt recycling technology has received widespread attention, which can effectively utilize a large amount of waste asphalt mixture generated during the maintenance of asphalt pavements.

[0003] Asphalt aging is an irreversible chemical change, and asphalt regeneration is the reverse process of asphalt aging. Asphalt regeneration agent is an ideal material to achieve this reverse process. The mainstream asphalt regeneration agent products on the market are mainly developed based on the compatibility theory and component adjustment theory. They are generally made of heavy oil as the main raw material, which is costly. In addition, they need to be heated to 170-180℃ during the mixing process with the old asphalt mixture, which consumes a lot of energy and is not conducive to energy saving. Summary of the invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide an asphalt regeneration agent with the advantages of low cost and low energy consumption.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] An asphalt regeneration agent is composed of the following raw materials, measured by weight: 45-55 parts of purified waste oil, 10-15 parts of furfural emulsified oil, 10-15 parts of methyl carbamate, 10-15 parts of waste rubber powder, 3-6 parts of mica powder, and 2-4 parts of modified fiber.

[0007] Preferably, the preparation steps of the purified waste oil are: filtering the waste oil, taking the filtrate, letting the filtrate stand, removing the water phase, taking the oil phase for carbonization treatment, filtering, and the obtained filtrate is the purified waste oil.

[0008] Preferably, the furfural emulsified oil is prepared by mixing 5 parts of alkylphenol polyoxyethylene ether with 65 parts of furfural extracted oil, heating to 80-85°C, adding 1.2 parts of dodecyl sulfonate and 28.8 parts of water, mixing evenly, and obtaining the furfural emulsified oil.

[0009] Preferably, the particle size of the waste rubber powder is 80-100 mesh.

[0010] Preferably, the mica powder is coarse mica powder with a particle size of 150-170 mesh.

[0011] Preferably, the preparation steps of the modified fiber are: 6 parts of glass fiber and 4 parts of sisal fiber are mixed evenly, soaked in concentrated nitric acid, filtered, washed and dried to obtain mixed fiber; 2 parts of silicone rubber and 1 part of polypropylene are mixed and heated, added to the obtained mixed fiber, stirred and mixed evenly to obtain modified fiber.

[0012] Another object of the present invention is to provide a method for preparing the aforementioned asphalt regeneration agent, which comprises the following steps:

[0013] S1. Weigh the raw materials in proportion, heat the purified waste oil and furfural emulsified oil to 90-95° C., add the waste rubber powder under stirring to obtain a first mixture;

[0014] S2, heating the first mixture to 175-185° C., stirring at a constant temperature for 5-10 minutes, then cooling to 125-135° C., adding mica powder and modified fiber, stirring at a constant temperature for 15-25 minutes, to obtain a second mixture;

[0015] S3, cooling the second mixture to 90-100°C, adding methyl carbamate, continuing stirring for 15-25 minutes, and then cooling to room temperature to obtain the asphalt regeneration agent.

[0016] Preferably, the stirring speed in step S1 is 3000-3500 rpm, and the stirring speeds in steps S2 and 3 are both 2000-2500 rpm.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] (1) The present invention uses waste cooking oil as the main raw material for preparation, realizes the reuse of waste resources, and effectively reduces costs. After being purified, waste cooking oil acts as a diluent to reduce the viscosity of aged asphalt.

[0019] (2) After the furfural extracted oil is emulsified with alkylphenol polyoxyethylene ether and dodecyl sulfonate, it has both hydrophilic and lipophilic groups in its molecules, which can significantly reduce the surface tension of the system, open the channels between the originally agglomerated asphalt molecules, reduce the viscosity of the asphalt molecules, and improve its fluidity, thereby promoting the blending of the furfural extracted oil with the various components of the asphalt, promoting the furfural extracted oil to better enter various parts of the asphalt, and fully replenishing the light components in the asphalt colloidal structure, thereby dissolving and blending the component ratios of the asphalt, achieving a better regeneration effect, and effectively reducing the mixing temperature and achieving the effect of reducing energy consumption.

[0020] (3) Methyl carbamate contains some strong polar groups, which can react chemically with the asphaltenes in aged asphalt and form hydrogen bonds, thereby reducing the attraction between asphaltene molecules; it can also react with the strong polar groups around the asphaltene to generate an intermediate phase with the same polarity as the colloid, thereby strengthening the adsorption of asphaltene on the surrounding colloids, allowing purified waste oil and furfural extracted oil to better penetrate into the aged asphalt, restoring and forming a more stable colloid structure.

[0021] (4) The addition of waste rubber powder further promotes the recycling of waste resources. Waste rubber powder and asphalt can form a network structure, further improving the thermal stability of recycled asphalt.

[0022] (5) Mica powder has a special surface structure, which improves the bonding performance of the binder, increases the strength of the asphalt mixture against cyclic loads, and improves the fatigue resistance of the recycled asphalt mixture.

[0023] (6) The modified fiber prepared by the present invention is a mixed fiber of glass fiber and sisal fiber. When treated with acid solution, abundant hydroxyl groups are formed on the surface. After being treated with silicone rubber and polypropylene, the modified fiber can be well mixed with the asphalt of aged asphalt, thereby reducing the agglomeration of fibers in the mixture and improving the strength and stability of the mixture. At the same time, a layer of silicone rubber and polypropylene formed on the surface is very easy to melt at the mixing temperature, which can soften and thicken the asphalt. DETAILED DESCRIPTION

[0024] The present invention is further described below in conjunction with embodiments, but the scope of protection claimed by the present invention is not limited to the scope described in the embodiments.

[0025] Example 1

[0026] An asphalt regeneration agent is composed of the following raw materials: 45 parts of purified waste oil, 15 parts of furfural emulsified oil, 15 parts of methyl carbamate, 15 parts of waste rubber powder, 6 parts of mica powder, and 4 parts of modified fiber.

[0027] The preparation steps of purified waste oil are as follows: filtering the waste oil, taking the filtrate, letting the filtrate stand, removing the water phase, taking the oil phase for carbonization treatment, filtering, and obtaining the filtrate is the purified waste oil.

[0028] The preparation steps of furfural emulsified oil are as follows: 5 parts of alkylphenol polyoxyethylene ether are mixed with 65 parts of furfural extracted oil, heated to 80-85°C while stirring at a speed of 400-600 rpm, 1.2 parts of dodecyl sulfonate and 28.8 parts of water are added thereto, and stirred at a speed of 400-500 rpm for 100-120 minutes until the mixture is uniformly mixed, thereby obtaining furfural emulsified oil.

[0029] The particle size of the waste rubber powder is 80-100 mesh; the mica powder is coarse mica powder, and its particle size is 150-170 mesh.

[0030] The preparation steps of the modified fiber are as follows: 6 parts of glass fiber and 4 parts of sisal fiber are mixed evenly, soaked in concentrated nitric acid for 2-2.5 hours, filtered, washed with clean water, and dried to obtain a mixed fiber; 2 parts of silicone rubber and 1 part of polypropylene are mixed and heated to 265-275° C., added to the prepared mixed fiber, and stirred at a speed of 300-350 rpm for 60-90 minutes until the mixture is evenly mixed.

[0031] The preparation method of the above-mentioned asphalt regeneration agent comprises the following steps:

[0032] S1. Weigh the raw materials in proportion, heat the purified waste oil and furfural emulsified oil to 90-95° C., add the waste rubber powder under stirring at 3000-3500 rpm to obtain a first mixture;

[0033] S2, heating the first mixture to 175-185° C., stirring at a constant temperature of 2000-2500 rpm for 10 min, cooling to 125-135° C., adding mica powder and modified fiber, stirring at a constant temperature of 2000-2500 rpm for 15 min, to obtain a second mixture;

[0034] S3. Cool the second mixture to 90-100°C, add methyl carbamate, continue stirring at a speed of 2000-2500 rpm for 15-25 minutes, and then cool to room temperature to obtain an asphalt regeneration agent.

[0035] Example 2

[0036] An asphalt regeneration agent is composed of the following raw materials: 55 parts of purified waste oil, 10 parts of furfural emulsified oil, 10 parts of methyl carbamate, 15 parts of waste rubber powder, 6 parts of mica powder, and 4 parts of modified fiber.

[0037] The preparation steps of purified waste oil are the same as those in Example 1.

[0038] The preparation steps of furfural emulsified oil are the same as those in Example 1.

[0039] The particle size of the waste rubber powder is 80-100 mesh; the mica powder is coarse mica powder, and its particle size is 150-170 mesh.

[0040] The preparation steps of the modified fiber are the same as those in Example 1.

[0041] The preparation method of the above-mentioned asphalt regeneration agent is the same as that in Example 1.

[0042] Example 3

[0043] An asphalt regeneration agent is composed of the following raw materials: 55 parts of purified waste oil, 15 parts of furfural emulsified oil, 15 parts of methyl carbamate, 10 parts of waste rubber powder, 3 parts of mica powder and 2 parts of modified fiber.

[0044] The preparation steps of purified waste oil are the same as those in Example 1.

[0045] The preparation steps of furfural emulsified oil are the same as those in Example 1.

[0046] The particle size of the waste rubber powder is 80-100 mesh; the mica powder is coarse mica powder, and its particle size is 150-170 mesh.

[0047] The preparation steps of the modified fiber are the same as those in Example 1.

[0048] The preparation method of the above-mentioned asphalt regeneration agent is the same as that in Example 1.

[0049] Comparative Example 1

[0050] Compared with Example 1, the difference is that 15 parts of furfural emulsified oil are omitted.

[0051] Comparative Example 2

[0052] Compared with Example 1, the difference is that 15 parts of methyl carbamate are omitted.

[0053] Comparative Example 3

[0054] Compared with Example 1, the difference is that 15 parts of waste rubber powder are omitted.

[0055] Comparative Example 4

[0056] Compared with Example 1, the difference is that 6 parts of mica powder are omitted.

[0057] Comparative Example 5

[0058] Compared with Example 1, the difference is that 4 parts of modified fiber are omitted.

[0059] Comparative Example 6

[0060] Compared with Example 1, the difference is that furfural extracted oil is used to replace furfural emulsified oil.

[0061] Comparative Example 7

[0062] Compared with Example 1, the difference is that the modified fiber is replaced by the mixed fiber prepared in Example 1, that is, the mixed fiber is not mixed and modified with silicone rubber and polypropylene.

[0063] In order to verify the performance of the asphalt regeneration agent of the present invention, the asphalt regeneration agents prepared in the above Examples 1-3 and Comparative Examples 1-7 were stirred and mixed with aged asphalt heated to 150-160°C to achieve the regeneration of the aged asphalt, wherein the mass ratio of the asphalt regeneration agent to the aged asphalt was 1:9.

[0064] According to the test methods T0604, T0605, T0606 and T0719 in JTGE20-2011 "Test Procedures for Asphalt and Asphalt Mixtures for Highway Engineering", the penetration, ductility, softening point and dynamic stability of the recycled asphalt and aged asphalt prepared above were tested respectively, and the results are as follows:

[0065] Table 1 Performance data of recycled asphalt and aged asphalt

[0066]

[0067] As can be seen from the above table, the asphalt regeneration agents of Examples 1-3 of the present invention all significantly increase the penetration, ductility, softening point, and dynamic stability of aged asphalt, thereby achieving the recovery of the performance of aged asphalt. Compared with Comparative Examples 1-6, Example 1 shows that the addition of the asphalt regeneration agent of the present invention breaks the original system of aged asphalt, dissolves each component again, and rebalances the proportion of each component, while improving the stability and strength of the regenerated asphalt. Compared with Comparative Example 6, Comparative Example 1 shows that after the furfural extracted oil is emulsified with alkylphenol polyoxyethylene ether and dodecyl sulfonate, it can significantly reduce the surface tension of the system, open the channels between the originally agglomerated asphaltene molecules, reduce the viscosity of the asphalt molecules, and improve its fluidity, thereby promoting the reconciliation of the furfural extracted oil with the various components of the asphalt, promoting the furfural extracted oil to better enter various parts of the asphalt, and fully supplementing the light components in the asphalt colloid structure, thereby dissolving and reconciling the component proportions of the asphalt, and achieving a better regeneration effect. Comparison of Comparative Example 5 with Comparative Example 7 shows that the hybrid fiber treated with silicone rubber and polypropylene can be well mixed with the asphaltene of aged asphalt, reducing the phenomenon of fiber agglomeration in the mixture and improving the strength and stability of the mixture.

[0068] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. An asphalt regeneration agent, characterized in that: The raw materials are as follows: 45-55 parts of purified waste oil, 10-15 parts of furfural emulsified oil, 10-15 parts of methyl carbamate, 10-15 parts of waste rubber powder, 3-6 parts of mica powder, and 2-4 parts of modified fiber. The preparation steps of the purified waste oil are as follows: filtering the waste oil, taking the filtrate, letting the filtrate stand, removing the water phase, taking the oil phase for carbonization treatment, filtering, and obtaining the filtrate as the purified waste oil; The furfural emulsified oil is prepared by mixing 5 parts of alkylphenol polyoxyethylene ether with 65 parts of furfural extracted oil, heating the mixture to 80-85° C., adding 1.2 parts of dodecyl sulfonate and 28.8 parts of water, and mixing the mixture evenly to obtain the furfural emulsified oil. The preparation steps of the modified fiber are as follows: 6 parts of glass fiber and 4 parts of sisal fiber are mixed evenly, immersed in concentrated nitric acid, filtered, washed and dried to obtain mixed fiber; 2 parts of silicone rubber and 1 part of polypropylene are mixed and heated, added to the obtained mixed fiber, stirred and mixed evenly to obtain modified fiber.

2. An asphalt regeneration agent according to claim 1, characterized in that: The particle size of the waste rubber powder is 80-100 meshes.

3. An asphalt regeneration agent according to claim 1, characterized in that: The mica powder is coarse mica powder with a particle size of 150-170 meshes.

4. A method for preparing an asphalt regeneration agent according to any one of claims 1 to 3, characterized in that: The following steps are involved: S1. Weigh the raw materials in proportion, heat the purified waste oil and furfural emulsified oil to 90-95° C., add the waste rubber powder under stirring to obtain a first mixture; S2, heating the first mixture to 175-185° C., stirring at a constant temperature for 5-10 minutes, then cooling to 125-135° C., adding mica powder and modified fiber, stirring at a constant temperature for 15-25 minutes, to obtain a second mixture; S3, cooling the second mixture to 90-100°C, adding methyl carbamate, continuing stirring for 15-25 minutes, and then cooling to room temperature to obtain the asphalt regeneration agent.

5. The method for preparing the asphalt regeneration agent according to claim 4, characterized in that: The stirring speed in step S1 is 3000-3500 rpm, and the stirring speeds in steps S2 and 3 are both 2000-2500 rpm.

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