Component recovery agent, recycled asphalt and preparation method

Abstract

The invention relates to the technical field of recycled asphalt, and provides a component recovery agent, recycled asphalt and a preparation method, and the component recovery agent comprises the following components by weight: 95% of aromatic base oil, 1.5% of silicone oil, 1.0% of an antioxidant, 0.5% of a dispersant and 2.0% of a penetrant. On the basis, the function of recovering the aged asphalt can be better realized, and the high temperature resistance and durability of the recycled asphalt are ensured.

Description

Technical Field

[0001] The present application relates to the field of regenerated asphalt, and in particular to a component restoration agent, regenerated asphalt and a preparation method. Background Art

[0002] According to estimates by relevant departments, about 12% of asphalt pavements in my country need maintenance and repair every year due to long-term use and natural wear and tear. In this process, the amount of recycled asphalt mixture (RAP) generated is huge, reaching tens of millions of tons. However, due to the limitations of processing technology and facilities, these RAP materials are often not properly handled in time, resulting in large amounts of accumulation.

[0003] Therefore, studying how to efficiently and reasonably use a certain proportion of RAP materials in asphalt mixtures to reduce highway maintenance costs, save natural resources, and reduce environmental pollution and land occupation has become an urgent task in the current field of road engineering research.

[0004] At present, in the application of recycled asphalt mixtures, the method of adding regeneration agents is generally used to restore the function of aged asphalt. A large number of studies have shown that by adding regeneration agents, the penetration of asphalt will be significantly increased, the softening point will be reduced, the ductility will be increased, and G* / sinθ (the ratio of the complex shear modulus to the sine of the phase angle) will also be reduced, which improves the low-temperature performance of asphalt to a certain extent. However, the use of regeneration agents also brings some problems. In particular, it may significantly reduce the high-temperature performance of asphalt pavement, which is an important consideration for sections that need to withstand high temperatures and heavy traffic.

[0005] In addition, the regeneration agent is usually added during the mixing process of the recycled asphalt mixture in the mixing plant. Since the mixing time is usually only 45-60 seconds, it is difficult to ensure that the regeneration agent and the old asphalt are fully integrated in such a short time. This will lead to the unevenness of the recycled asphalt mixture system, which in turn affects the stability and durability of the recycled asphalt mixture pavement. Therefore, how to better restore the function of the aged asphalt and ensure the high temperature resistance and durability of the recycled asphalt is a key issue that needs to be solved in the current recycled asphalt mixture technology. Summary of the invention

[0006] In order to better restore the function of aged asphalt and ensure the high temperature resistance and durability of recycled asphalt.

[0007] On the one hand, the present application provides a component recovery agent, which adopts the following technical solution:

[0008] A component recovery agent comprises the following components in weight percentage: 95% aromatic base oil, 1.5% silicone oil, 1.0% antioxidant, 0.5% dispersant and 2.0% penetrant.

[0009] Optionally, the silicone oil is one or more of phenyl silicone oil, methylphenyl silicone oil and methylchlorophenyl silicone oil.

[0010] Optionally, the antioxidant is prepared by compounding pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] and tris[2,4-di-tert-butylphenyl]phosphite in a ratio of 1:1 (weight ratio).

[0011] Optionally, the dispersant is prepared by compounding polyisobutylene succinate and high molecular weight succinimide in a ratio of 1:1 (weight ratio).

[0012] Optionally, the penetrant is prepared by compounding 2-cyanoacrylate ethylene glycol monomethyl ether, glycidyl methacrylate, polydimethylsiloxane, methyl polyoxyethylene epoxy ether and γ-aminopropyl triethoxysilane in a ratio of 80:9:3:7:1 (weight ratio).

[0013] On the other hand, the present application provides a method for preparing a component recovery agent, which adopts the following technical solution:

[0014] A method for preparing a component recovery agent comprises the following steps:

[0015] Dehydrate 95% aromatic base oil at 120°C for 180 minutes, then cool to 60-90°C; add 5% dispersant and stir for 30 minutes; add 1.5% silicone oil; add 2.0% penetrant and 1.0% antioxidant, and continue stirring for 120 minutes to obtain a component recovery agent.

[0016] On the other hand, the present application provides a regenerated asphalt, which adopts the following technical solution:

[0017] A regenerated asphalt comprises the following components in weight percentage: 55-80% of heavy cross-linked asphalt, 5-10% of a polymer modifier, 0.1-0.25% of a stabilizer, 0.3-1.0% of polyphosphoric acid, and 12-35% of a component recovery agent.

[0018] Optionally, the polymer modifier is one or more of polystyrene-butadiene-styrene, polystyrene-butadiene rubber, polyethylene propylene diene rubber, and polynitrile-butadiene rubber.

[0019] Optionally, the phosphorus pentoxide content in the polyphosphoric acid is 116%.

[0020] On the other hand, the present application provides a method for preparing regenerated asphalt, which adopts the following technical solution:

[0021] A method for preparing regenerated asphalt comprises the following steps:

[0022] S1: Preparation of component recovery agent: dehydrate 95% aromatic base oil at 120°C for 180 minutes, then cool to 60-90°C; add 5% dispersant and stir for 30 minutes, the dispersant is compounded by polyisobutylene succinate and high molecular weight succinimide in a ratio of 1:1 (weight ratio);

[0023] Add 1.5% silicone oil, wherein the silicone oil is one or more of phenyl silicone oil, methylphenyl silicone oil and methylchlorophenyl silicone oil;

[0024] 2.0% of a penetrant and 1.0% of an antioxidant were added, and stirring was continued for 120 minutes to obtain a component recovery agent; wherein the penetrant was compounded by 2-cyanoacrylate ethylene glycol monomethyl ether, glycidyl methacrylate, polydimethylsiloxane, methyl polyoxyethylene epoxy ether and γ-aminopropyl triethoxysilane in a ratio of 80:9:3:7:1 (weight ratio); and the antioxidant was compounded by tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester and tris[2,4-di-tert-butylphenyl] phosphite in a ratio of 1:1 (weight ratio);

[0025] S2: Preparation of regenerated asphalt: It is prepared from 55-80% heavy cross-linked asphalt, 5-10% polymer modifier, 0.1-0.25% stabilizer, 0.3-1.0% polyphosphoric acid and 12-35% component restorer.

[0026] In summary, this application includes the following beneficial technical effects:

[0027] 1. The component restorer has multiple beneficial effects such as heat resistance and oxidation resistance, extended service life, improved dispersibility and cleaning performance, and enhanced penetration and repair capabilities;

[0028] 2. The subsequent addition operation is carried out after the temperature drops to 60-90℃, which not only ensures that the dispersant, silicone oil, penetrant and antioxidant can be evenly dissolved and dispersed, but also avoids the failure of components or safety hazards caused by excessive temperature, and comprehensively improves the heat resistance and durability of the recycled asphalt, extending its service life. DETAILED DESCRIPTION

[0029] The following examples further illustrate the present application in detail.

[0030] The compounding and mixing methods in the following embodiments are all physical mixing unless otherwise specified.

[0031] The embodiment of the present application discloses a component recovery agent, which includes the following components in weight percentage: 95% aromatic base oil, 1.5% silicone oil, 1.0% antioxidant, 0.5% dispersant and 2.0% penetrant.

[0032] The silicone oil is one or more of phenyl silicone oil, methylphenyl silicone oil and methylchlorophenyl silicone oil, which significantly improves the heat resistance and lubrication performance of the component restoration agent, and helps to improve the high temperature stability and wear resistance of the recycled asphalt.

[0033] The antioxidant is compounded by tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester and tris[2,4-di-tert-butylphenyl] phosphite in a ratio of 1:1 (weight ratio). It can effectively prevent asphalt from aging due to oxidation and extend the service life of asphalt.

[0034] The dispersant is compounded with polyisobutylene succinate and high molecular weight succinimide in a ratio of 1:1 (weight ratio), ensuring that each component is evenly distributed in the aromatic base oil to avoid agglomeration and precipitation.

[0035] The penetrant is compounded by 2-cyanoacrylate ethylene glycol monomethyl ether ester, glycidyl methacrylate, polydimethylsiloxane, methyl polyoxyethylene epoxy ether and γ-aminopropyl triethoxysilane in a ratio of 80:9:3:7:1 (weight ratio). It has excellent penetrating properties and can quickly penetrate into the tiny pores of asphalt to improve the microstructure and performance of asphalt.

[0036] The present application also discloses a method for preparing a component recovery agent. The method for preparing a component recovery agent comprises the following steps:

[0037] Dehydrate 95% aromatic base oil at 120°C for 180 minutes, then cool to 60-90°C; add 5% dispersant and stir for 30 minutes; add 1.5% silicone oil; add 2.0% penetrant and 1.0% antioxidant, and continue stirring for 120 minutes to obtain a component recovery agent.

[0038] By dehydrating the 95% aromatic base oil at 120°C for 180 minutes, the water in the oil is effectively removed, avoiding the negative impact of water on subsequent steps, while ensuring the purity and stability of the oil. Subsequent addition operations are carried out after cooling to 60-90°C, which not only ensures that the dispersant, silicone oil, penetrant and antioxidant can be evenly dissolved and dispersed, but also avoids component failure or safety hazards caused by excessive temperature.

[0039] The embodiments of the present application also disclose a method for preparing regenerated asphalt.

[0040] In the following examples, the distillation range of the aromatic base oil is 300-360° C., and the aromatic content is above 95%.

[0041] The silicone oil can be a mixture of one or more of phenyl silicone oil, methylphenyl silicone oil, and methylchlorophenyl silicone oil in any proportion. Phenyl silicone oil is taken as an example below.

[0042] Embodiment 1:

[0043] A method for preparing regenerated asphalt comprises the following steps:

[0044] S1: Preparation of component recovery agent: dehydrate 95% aromatic base oil at 120°C for 180 minutes, then cool to 60-90°C; add 5% dispersant and stir for 30 minutes, the dispersant is compounded by polyisobutylene succinate and high molecular weight succinimide in a ratio of 1:1 (weight ratio);

[0045] Add 1.5% silicone oil, the silicone oil is phenyl silicone oil;

[0046] 2.0% of a penetrant and 1.0% of an antioxidant were added, and stirring was continued for 120 minutes to obtain a component recovery agent; wherein the penetrant was compounded by 2-cyanoacrylate ethylene glycol monomethyl ether, glycidyl methacrylate, polydimethylsiloxane, methyl polyoxyethylene epoxy ether and γ-aminopropyl triethoxysilane in a ratio of 80:9:3:7:1 (weight ratio); and the antioxidant was compounded by tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester and tris[2,4-di-tert-butylphenyl] phosphite in a ratio of 1:1 (weight ratio);

[0047] S2: Preparation of recycled asphalt: 67% heavy cross-linked asphalt, 8% polymer modifier, 0.2% stabilizer, 0.5% polyphosphoric acid and 24.3% component restorer are mixed and reacted with each other. The polymer modifier is one or more of polystyrene-butadiene-styrene, polystyrene-butadiene rubber, polyethylene propylene rubber and polynitrile-butadiene rubber; the phosphorus pentoxide content in the polyphosphoric acid is 116%.

[0048] Embodiment 2:

[0049] A method for preparing regenerated asphalt comprises the following steps:

[0050] S1: Preparation of component recovery agent: dehydrate 95% aromatic base oil at 120°C for 180 minutes, then cool to 60-90°C; add 5% dispersant and stir for 30 minutes, the dispersant is compounded by polyisobutylene succinate and high molecular weight succinimide in a ratio of 1:1 (weight ratio);

[0051] Add 1.5% silicone oil, the silicone oil is phenyl silicone oil;

[0052] 2.0% of a penetrant and 1.0% of an antioxidant were added, and stirring was continued for 120 minutes to obtain a component recovery agent; wherein the penetrant was compounded by 2-cyanoacrylate ethylene glycol monomethyl ether, glycidyl methacrylate, polydimethylsiloxane, methyl polyoxyethylene epoxy ether and γ-aminopropyl triethoxysilane in a ratio of 80:9:3:7:1 (weight ratio); and the antioxidant was compounded by tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester and tris[2,4-di-tert-butylphenyl] phosphite in a ratio of 1:1 (weight ratio);

[0053] S2: Preparation of regenerated asphalt: prepared by mixing and reacting 79.3% heavy cross-linked asphalt, 8% polymer modifier, 0.2% stabilizer, 0.5% polyphosphoric acid and 12% component restorer. The polymer modifier is one or more of polystyrene-butadiene-styrene, polystyrene-butadiene rubber, polyethylene propylene diene rubber and polynitrile-butadiene rubber; the phosphorus pentoxide content in the polyphosphoric acid is 116%.

[0054] Embodiment 3:

[0055] A method for preparing regenerated asphalt comprises the following steps:

[0056] S1: Preparation of component recovery agent: dehydrate 95% aromatic base oil at 120°C for 180 minutes, then cool to 60-90°C; add 5% dispersant and stir for 30 minutes, the dispersant is compounded by polyisobutylene succinate and high molecular weight succinimide in a ratio of 1:1 (weight ratio);

[0057] Add 1.5% silicone oil, the silicone oil is phenyl silicone oil;

[0058] 2.0% of a penetrant and 1.0% of an antioxidant were added, and stirring was continued for 120 minutes to obtain a component recovery agent; wherein the penetrant was compounded by 2-cyanoacrylate ethylene glycol monomethyl ether, glycidyl methacrylate, polydimethylsiloxane, methyl polyoxyethylene epoxy ether and γ-aminopropyl triethoxysilane in a ratio of 80:9:3:7:1 (weight ratio); and the antioxidant was compounded by tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester and tris[2,4-di-tert-butylphenyl] phosphite in a ratio of 1:1 (weight ratio);

[0059] S2: Preparation of recycled asphalt: 56.3% heavy cross-linked asphalt, 8% polymer modifier, 0.2% stabilizer, 0.5% polyphosphoric acid and 35% component restorer are mixed and reacted with each other. The polymer modifier is one or more of polystyrene-butadiene-styrene, polystyrene-butadiene rubber, polyethylene propylene rubber and polynitrile-butadiene rubber; the phosphorus pentoxide content in the polyphosphoric acid is 116%.

[0060] In the above embodiments, the kinematic viscosity of the component recovery agents at 100° C. is 2-5 mPa.s.

[0061] Performance Test:

[0062] The regenerated asphalt prepared in the above Examples 1-3 and the regeneration agent purchased from the market were used to prepare the regenerated asphalt mixture, and the regeneration agent was used as a comparative example. The four-point bending fatigue life under different strain values ​​was tested according to the Ministry of Transportation industry standard JTG E20-2011 (T0610-2011) on the day of preparation and 30 days after preparation. The test conditions were: temperature 15°C and frequency 10Hz. At the same time, the dynamic shear rheological failure temperature of the asphalt after RTFOT aging was tested according to the Ministry of Transportation industry standard JTG E20-2011 (T0627-2011).

[0063] The results of Examples 1-3 correspond to Tables 1-3 respectively.

[0064] Table 1:

[0065]

[0066] It can be seen from the data in Table 1 that the four-point bending fatigue results obtained by adding a regeneration agent and using the regenerated asphalt of Example 1 are quite different. The fatigue times of using the regenerated asphalt at 300με are increased by 80.8% compared with using the regeneration agent, the fatigue times of using the regenerated asphalt at 400με are increased by 52.0% compared with using the regeneration agent, and the fatigue times of using the regenerated asphalt at 500με are increased by 49.1% compared with using the regeneration agent.

[0067] Similarly, the fatigue performance of the regenerated asphalt was retested after 30 days, and it was significantly improved compared with the original sample (i.e. the regenerated asphalt mixture prepared on the day), with an increase of 12.6%, 13.5% and 12.3% under the conditions of 300με, 400με and 500με strains, respectively. This shows that the regenerated asphalt has a certain penetration effect. After a period of time, the new and old materials are fully integrated, and the fatigue performance is significantly improved, so it is more durable. However, the fatigue performance of the regenerated agent retested after 30 days is almost the same as that of the original sample (i.e. the regenerated agent mixture prepared on the day), and is even lower. Therefore, the permeability of the regenerated agent is poor.

[0068] The failure temperature of the asphalt DSR using the regeneration agent and Example 1 shows that the regenerated asphalt has better high temperature performance and therefore has better heat resistance.

[0069] Table 2:

[0070]

[0071] It can be seen from the data in Table 2 that the four-point bending fatigue results obtained by adding the regeneration agent and using the regenerated asphalt of Example 2 are quite different. The fatigue times of using the regenerated asphalt at 300με are increased by 33.5% compared with the use of the regeneration agent, the fatigue times of using the regenerated asphalt at 400με are increased by 19.8% compared with the use of the regeneration agent, and the fatigue times of using the regenerated asphalt at 500με are increased by 20.1% compared with the use of the regeneration agent.

[0072] Similarly, the fatigue performance of the recycled asphalt was retested after 30 days, and it was significantly improved compared with the original sample. Under the conditions of 300με, 400με and 500με strain, it increased by 10.5%, 10.9% and 13.1% respectively. This shows that the recycled asphalt has a certain penetration effect, and after a period of time, the new and old materials are fully integrated, and the fatigue performance is significantly improved.

[0073] The failure temperature of the asphalt DSR using the regeneration agent and Example 2 shows that the regenerated asphalt has better high temperature performance and therefore has better heat resistance.

[0074] Table 3:

[0075]

[0076] It can be seen from the data in Table 3 that the four-point bending fatigue results obtained by adding the regeneration agent and using the regenerated asphalt of Example 3 are quite different. The fatigue times of using the regenerated asphalt at 300με are increased by 208.3% compared with the use of the regeneration agent, the fatigue times of using the regenerated asphalt at 400με are increased by 308.1% compared with the use of the regeneration agent, and the fatigue times of using the regenerated asphalt at 500με are increased by 185.1% compared with the use of the regeneration agent.

[0077] Similarly, the fatigue performance of the recycled asphalt was retested after 30 days, and it was significantly improved compared with the original sample. Under the conditions of 300με, 400με and 500με strain, it increased by 14.8%, 12.1% and 12.6% respectively. This shows that the recycled asphalt has a certain penetration effect. After a period of time, the new and old materials are fully integrated, and the fatigue performance is significantly improved. The DSR failure temperature of the asphalt of the two schemes shows that the recycled asphalt has better high temperature performance.

[0078] The failure temperature of the asphalt DSR using the regeneration agent and Example 3 shows that the regenerated asphalt has better high temperature performance and therefore has better heat resistance.

[0079] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A component recovery agent, characterized in that: The invention comprises the following components in weight percentage: 95% aromatic base oil, 1.5% silicone oil, 1.0% antioxidant, 0.5% dispersant and 2.0% penetrant.

2. A component recovery agent according to claim 1, characterized in that: The silicone oil is one or more of phenyl silicone oil, methylphenyl silicone oil and methylchlorophenyl silicone oil.

3. A component recovery agent according to claim 1, characterized in that: The antioxidant is prepared by compounding tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester and tris[2,4-di-tert-butylphenyl] phosphite in a ratio of 1:1 (weight ratio).

4. A component recovery agent according to claim 1, characterized in that: The dispersant is prepared by compounding polyisobutylene succinate and high molecular weight succinimide in a ratio of 1:1 (weight ratio).

5. A component recovery agent according to claim 1, characterized in that: The penetrant is prepared by compounding 2-cyanoacrylate ethylene glycol monomethyl ether, glycidyl methacrylate, polydimethylsiloxane, methyl polyoxyethylene epoxy ether and gamma-aminopropyl triethoxysilane in a ratio of 80:9:3:7:1 (weight ratio).

6. A method for preparing the component recovery agent according to any one of claims 1 to 5, characterized in that: The following steps are involved: Dehydrate 95% aromatic base oil at 120°C for 180 minutes, then cool to 60-90°C; add 5% dispersant and stir for 30 minutes; add 1.5% silicone oil; add 2.0% penetrant and 1.0% antioxidant, and continue stirring for 120 minutes to obtain a component recovery agent.

7. A regenerated asphalt, characterized in that: It comprises the component recovery agent as described in any one of claims 1 to 5; specifically comprises the following components in weight percentage: 55-80% heavy traffic asphalt, 5-10% polymer modifier, 0.1-0.25% stabilizer, 0.3-1.0% polyphosphoric acid, and 12-35% component recovery agent.

8. The regenerated asphalt according to claim 7, characterized in that: The polymer modifier is one or more of polystyrene-butadiene-styrene, polystyrene-butadiene rubber, polyethylene propylene diene rubber, and polynitrile-butadiene rubber.

9. The regenerated asphalt according to claim 7, characterized in that: The phosphorus pentoxide content in polyphosphoric acid is 116%.

10. A method for preparing the regenerated asphalt according to claim 7, characterized in that: The following steps are involved: S1: Preparation of component recovery agent: dehydrate 95% aromatic base oil at 120°C for 180 minutes, then cool to 60-90°C; add 5% dispersant and stir for 30 minutes, the dispersant is compounded by polyisobutylene succinate and high molecular weight succinimide in a ratio of 1:1 (weight ratio); Add 1.5% silicone oil, wherein the silicone oil is one or more of phenyl silicone oil, methylphenyl silicone oil and methylchlorophenyl silicone oil; 2.0% of a penetrant and 1.0% of an antioxidant were added, and stirring was continued for 120 minutes to obtain a component recovery agent; wherein the penetrant was compounded by 2-cyanoacrylate ethylene glycol monomethyl ether, glycidyl methacrylate, polydimethylsiloxane, methyl polyoxyethylene epoxy ether and γ-aminopropyl triethoxysilane in a ratio of 80:9:3:7:1 (weight ratio); and the antioxidant was compounded by tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester and tris[2,4-di-tert-butylphenyl] phosphite in a ratio of 1:1 (weight ratio); S2: Preparation of regenerated asphalt: It is prepared from 55-80% heavy cross-linked asphalt, 5-10% polymer modifier, 0.1-0.25% stabilizer, 0.3-1.0% polyphosphoric acid and 12-35% component restorer.

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