Environment-friendly regenerant, preparation method thereof and regenerated asphalt

Abstract

The invention discloses an environment-friendly regenerant, a preparation method thereof and recycled asphalt. The environment-friendly regenerant comprises 100 parts of maltha; 5-15 parts of a component regulator; 5-10 parts of a plasticizer; by adjusting the component formula of the environment-friendly regenerant and cooperating with the corresponding preparation method, the regeneration effect of the environment-friendly regenerant is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of environmentally friendly materials, and in particular to an environmentally friendly regeneration agent and a preparation method thereof, and regenerated asphalt. Background Art

[0002] A large amount of raw materials are consumed in the process of road construction, maintenance and repair, and the recycling and reuse of old asphalt pavement materials has huge economic and environmental benefits. The aging and degeneration of asphalt limits the dosage of waste asphalt mixture and reduces the road performance of recycled asphalt mixture. Therefore, the high-quality regeneration of aged asphalt is of great significance for the green recycling application of pavement materials. The regeneration effect of aged asphalt is directly related to the regeneration agent. Although there are many mature regeneration agent products on the market, their quality and cost-effectiveness are uneven, and it is difficult to meet the ideal regeneration effect. It is crucial to design and improve the components of the regeneration agent reasonably.

[0003] The research and development of regeneration agents should be based on the asphalt coupling aging mechanism, with the restoration of pavement diseases as the starting point, the avoidance of similar diseases as the support, and the purpose of extending the service life of asphalt pavement. Based on this, some scholars have proposed the concept of "modification regeneration", that is, "regeneration" is defined as the restoration of performance, and "modification" is defined as the improvement of performance. Summary of the invention

[0004] The purpose of the present invention is to provide an environmentally friendly regeneration agent and a preparation method thereof and regenerated asphalt. By adjusting the component formula of the environmentally friendly regeneration agent and coordinating the corresponding preparation method, the regeneration effect of the environmentally friendly regeneration agent is greatly improved.

[0005] An environmentally friendly regeneration agent provided by the present invention comprises: 100 parts of soft asphalt; 5-15 parts of component regulator; 5-10 parts of plasticizer; 10-30 parts polymer modifier.

[0006] Furthermore, the soft asphalt is any one of No. 90, No. 100, No. 150 and No. 200 base asphalts.

[0007] Furthermore, the component regulator is a light oil component, and the component regulator is any one or more combinations of waste oil, waste engine oil, bio-oil, tall oil and aromatic oil.

[0008] Furthermore, the plasticizer is one or a combination of phthalate compounds, epoxy ester compounds and citrate compounds.

[0009] Furthermore, the phthalate compound is one of n-butyl phthalate and dioctyl phthalate, the epoxy ester compound is one of epoxidized soybean oil and epoxy stearate octyl ester, and the citrate compound is one of triethyl citrate and tributyl citrate.

[0010] Furthermore, the polymer modifier is a rubber-plastic alloy synthesized from an SBS modifier and waste rubber powder.

[0011] Furthermore, the molecular chain of the SBS modifier is a linear structure or a star structure, and the particle size of the waste rubber powder is any one of 5 mesh, 10 mesh, 20 mesh, 40 mesh, 60 mesh and 80 mesh.

[0012] The environmentally friendly regeneration agent provided by the present invention has soft asphalt and light oil of component regulator as main components, which can be used to supplement and adjust the component ratio of aged asphalt in the regeneration process of aged asphalt, and improve the plastic deformation ability and permeability of aged asphalt by adding plasticizer; SBS modifier and waste rubber powder are used as modifiers to simultaneously improve the high and low temperature performance and anti-aging performance of regenerated asphalt. The present invention relates to the recycling of wastes such as aged asphalt, waste oil, waste engine oil and waste rubber powder, which reduces the pollution to the ecological environment.

[0013] The present invention prepares a rubber-plastic alloy synthesized from an SBS modifier and waste rubber powder. In the asphalt regeneration process, not only can the performance advantages of the SBS modifier and the waste rubber powder be simultaneously exerted, but also, under the action of a stabilizer, the storage stability of the regenerated asphalt is improved compared with directly adding the SBS modifier and the waste rubber powder.

[0014] It not only enriches the solutions for the recycling and modification of current road pavement asphalt materials, but can also effectively alleviate the environmental pollution problems caused by waste rubber products, waste cooking oil, waste engine oil and other wastes, realizes the recycling of non-renewable resources, and has considerable economic and environmental benefits.

[0015] The present invention also provides a method for preparing the environmentally friendly regeneration agent as described above, comprising the steps of: S1: 100 parts of soft asphalt are heated at 130°C to a molten state; S2: Add 5-15 parts of component regulator and 5-10 parts of plasticizer, stir evenly and heat to 170-180°C; S3: Add 10-30 parts of polymer modifier and stir evenly; S4: The mixture stirred evenly in step S3 above was transferred to an oven at 170° C. for swelling for 60 minutes.

[0016] The present invention also provides a regenerated asphalt, comprising 15-50 parts of the above-mentioned environmentally friendly regeneration agent, and further comprising: 100 parts aged asphalt; 0.1-0.5 parts of stabilizer.

[0017] Furthermore, the stabilizer is any one of sulfur and dicumyl peroxide.

[0018] By adding an environmentally friendly regeneration agent to aged asphalt, the light oil fraction of soft asphalt and component regulator is used as the main component, which can be used to supplement and adjust the component ratio of aged asphalt in the regeneration process of aged asphalt, and at the same time, the plastic deformation capacity and permeability of aged asphalt are improved by adding a plasticizer; SBS modifier and waste rubber powder are used as modifiers to simultaneously improve the high and low temperature performance and anti-aging performance of the regenerated asphalt. The present invention relates to the recycling of wastes such as aged asphalt, waste oil, waste engine oil and waste rubber powder, thereby reducing pollution to the ecological environment.

[0019] The present invention prepares a rubber-plastic alloy synthesized from an SBS modifier and waste rubber powder. In the asphalt regeneration process, not only can the performance advantages of the SBS modifier and the waste rubber powder be simultaneously exerted, but also, under the action of a stabilizer, the storage stability of the regenerated asphalt is improved compared with directly adding the SBS modifier and the waste rubber powder. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is the segregation value of the regenerated asphalt described in some embodiments. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0022] An environmentally friendly regeneration agent provided by the present invention comprises: 100 parts of soft asphalt; 5-15 parts of component regulator; 5-10 parts of plasticizer; 10-30 parts polymer modifier.

[0023] The soft asphalt is any one of the base asphalts of No. 90, No. 100, No. 150 and No. 200.

[0024] The component regulator is a light oil component, and the component regulator is any one or more combinations of waste oil, waste engine oil, bio-oil, tall oil and aromatic oil.

[0025] The plasticizer is one or a combination of phthalate compounds, epoxy ester compounds and citrate compounds.

[0026] The phthalate ester compound is one of n-butyl phthalate and dioctyl phthalate, the epoxy ester compound is one of epoxidized soybean oil and epoxy stearate octyl ester, and the citrate ester compound is one of triethyl citrate and tributyl citrate.

[0027] The polymer modifier is a rubber-plastic alloy synthesized from SBS modifier and waste rubber powder.

[0028] The molecular chain of the SBS modifier is a linear structure or a star structure, and the particle size of the waste rubber powder is any one of 5 meshes, 10 meshes, 20 meshes, 40 meshes, 60 meshes and 80 meshes.

[0029] It is worth noting that the waste rubber powder described in the present invention mainly comes from waste tires.

[0030] The environmentally friendly regeneration agent provided by the present invention has soft asphalt and light oil of component regulator as main components, which can be used to supplement and adjust the component ratio of aged asphalt in the regeneration process of aged asphalt, and improve the plastic deformation ability and permeability of aged asphalt by adding plasticizer; SBS modifier and waste rubber powder are used as modifiers to simultaneously improve the high and low temperature performance and anti-aging performance of regenerated asphalt. The present invention relates to the recycling of wastes such as aged asphalt, waste oil, waste engine oil and waste rubber powder, which reduces the pollution to the ecological environment.

[0031] The present invention prepares a rubber-plastic alloy synthesized from an SBS modifier and waste rubber powder. In the asphalt regeneration process, not only can the performance advantages of the SBS modifier and the waste rubber powder be simultaneously exerted, but also, under the action of a stabilizer, the storage stability of the regenerated asphalt is improved compared with directly adding the SBS modifier and the waste rubber powder.

[0032] It not only enriches the solutions for the recycling and modification of current road pavement asphalt materials, but can also effectively alleviate the environmental pollution problems caused by waste rubber products, waste cooking oil, waste engine oil and other wastes, realizes the recycling of non-renewable resources, and has considerable economic and environmental benefits.

[0033] It is worth noting that the mass ratio of the above-mentioned SBS modifier to the waste rubber powder is 0.2-0.8.

[0034] The present invention also provides a process for synthesizing an SBS modifier and waste rubber powder, comprising the following steps: S1: Provide a plasticizer and heat the plasticizer to the set temperature with a roller spacing of 1 mm; S2: Put the SBS modifier (either linear structure or star structure) into the drum for plastication; S3: After the SBS modifier is melted into a sheet and wrapped around the roller, add the waste rubber powder and continue to plasticize for 5 minutes until the two are evenly mixed. The plasticizing temperature is set between 100-150℃.

[0035] S4: After the plasticating is completed, the pellets are granulated by mechanical crushing for later use.

[0036] The present invention also provides a method for preparing the above environmentally friendly regeneration agent, comprising the steps of: S1: 100 parts of soft asphalt are heated at 130°C to a molten state; S2: Add 5-15 parts of component regulator and 5-10 parts of plasticizer, stir evenly and heat to 170-180°C; S3: Add 10-30 parts of polymer modifier and stir evenly; S4: The mixture stirred evenly in step S3 above was transferred to an oven at 170° C. for swelling for 60 minutes.

[0037] The present invention also provides a regenerated asphalt, comprising 15-50 parts of the above environmentally friendly regeneration agent, and further comprising: 100 parts aged asphalt; 0.1-0.5 parts of stabilizer.

[0038] The stabilizer is any one of sulfur and dicumyl peroxide.

[0039] By adding an environmentally friendly regeneration agent to aged asphalt, the light oil fraction of soft asphalt and component regulator is used as the main component, which can be used to supplement and adjust the component ratio of aged asphalt in the regeneration process of aged asphalt, and at the same time, the plastic deformation capacity and permeability of aged asphalt are improved by adding a plasticizer; SBS modifier and waste rubber powder are used as modifiers to simultaneously improve the high and low temperature performance and anti-aging performance of the regenerated asphalt. The present invention relates to the recycling of wastes such as aged asphalt, waste oil, waste engine oil and waste rubber powder, thereby reducing pollution to the ecological environment.

[0040] The present invention prepares a rubber-plastic alloy synthesized from an SBS modifier and waste rubber powder. In the asphalt regeneration process, not only can the performance advantages of the SBS modifier and the waste rubber powder be simultaneously exerted, but also, under the action of a stabilizer, the storage stability of the regenerated asphalt is improved compared with directly adding the SBS modifier and the waste rubber powder.

[0041] The present invention provides the following embodiments 1-6, for preparing an environmentally friendly regeneration agent, and the specific process steps are as follows: Example

[0042] First, prepare the rubber-plastic alloy: Heat up the plasticator to the set temperature, and the roller spacing is 1mm; first put the linear SBS modifier into the roller for plasticization. After the SBS modifier is melted into sheets and wrapped around the roller, add waste rubber powder (the particle size of the rubber powder is 60 mesh) in a mass ratio of SBS modifier: waste rubber powder = 4:5, and continue plasticizing for 5 minutes until the two are evenly mixed. The plasticizing temperature is set to 130℃. After the plasticization is completed, the rubber-plastic alloy is granulated by mechanical crushing for later use.

[0043] Secondly, the environmentally friendly regeneration agent is prepared: Heat 100 parts of No. 200 base asphalt at 130°C to a molten state, add 10 parts of waste engine oil and 5 parts of tributyl citrate, stir evenly and heat to 170-180°C; then add 20 parts of the rubber-plastic alloy prepared in Example 1, stir evenly mechanically, transfer to an oven at 170°C to swell for 60 minutes; then use a shearing machine to high-speed shear at 6000rpm for 90 minutes. Example

[0044] First, prepare the rubber-plastic alloy: Heat the plasticizer to the set temperature, and the roller spacing is 1mm; first put the linear SBS modifier into the roller for plasticization, and after the SBS modifier is melted into a sheet and wrapped around the roller, add the waste rubber powder (the particle size of the rubber powder is 60 mesh) according to the mass ratio of SBS modifier: waste rubber powder = 4:10, and continue plasticizing for 5 minutes until the two are evenly mixed. The plasticizing temperature is set to 130℃. After plasticizing, the rubber-plastic alloy is granulated by mechanical crushing for standby use.

[0045] Secondly, the environmentally friendly regeneration agent is prepared: Heat 100 parts of No. 200 base asphalt at 130°C to a molten state, add 10 parts of waste engine oil and 5 parts of tributyl citrate, stir evenly and heat to 170-180°C; then add 20 parts of the rubber-plastic alloy prepared in Example 2, stir evenly mechanically, transfer to an oven at 170°C to swell for 60 minutes; then use a shearing machine to high-speed shear at 6000rpm for 90 minutes. Example

[0046] First, prepare the rubber-plastic alloy: Heat the plasticizer to the set temperature, and the roller spacing is 1mm; first put the linear SBS modifier into the roller for plasticization, and after the SBS modifier is melted into a sheet and wrapped around the roller, add the waste rubber powder (the particle size of the rubber powder is 60 mesh) according to the mass ratio of SBS modifier: waste rubber powder = 4:15, and continue plasticizing for 5 minutes until the two are evenly mixed. The plasticizing temperature is set to 130℃. After plasticizing, the rubber-plastic alloy is granulated by mechanical crushing for standby use.

[0047] Secondly, the environmentally friendly regeneration agent is prepared: Heat 100 parts of No. 200 base asphalt at 130°C to a molten state, add 10 parts of waste engine oil and 5 parts of tributyl citrate, stir evenly and heat to 170-180°C; then add 20 parts of the rubber-plastic alloy of Example 3, stir evenly mechanically, transfer to an oven at 170°C to swell for 60 minutes; then use a shearing machine to high-speed shear at 6000rpm for 90 minutes. Example

[0048] First, prepare the rubber-plastic alloy: Heat the plasticizer to the set temperature, and the roller spacing is 1mm; first put the linear SBS modifier into the roller for plasticization, and after the SBS modifier is melted into a sheet and wrapped around the roller, add the waste rubber powder (the particle size of the rubber powder is 60 mesh) according to the mass ratio of SBS modifier: waste rubber powder = 4:20, and continue plasticizing for 5 minutes until the two are evenly mixed. The plasticizing temperature is set to 130℃. After plasticizing, the rubber-plastic alloy is granulated by mechanical crushing for standby use.

[0049] Secondly, the environmentally friendly regeneration agent is prepared: Heat 100 parts of No. 200 base asphalt at 130°C to a molten state, add 10 parts of waste engine oil and 5 parts of tributyl citrate, stir evenly and heat to 170-180°C; then add 20 parts of the rubber-plastic alloy of Example 4, stir evenly mechanically, transfer to an oven at 170°C to swell for 60 minutes; then use a shearing machine to high-speed shear at 6000rpm for 90 minutes. Example

[0050] First, prepare the rubber-plastic alloy: Heat the plasticizer to the set temperature, and the roller spacing is 1mm; first put the linear SBS modifier into the roller for plasticization, and after the SBS modifier is melted into a sheet and wrapped around the roller, add the waste rubber powder (the particle size of the rubber powder is 60 mesh) according to the mass ratio of SBS modifier: waste rubber powder = 4:20, and continue plasticizing for 5 minutes until the two are evenly mixed. The plasticizing temperature is set to 100℃. After plasticizing, the rubber-plastic alloy is granulated by mechanical crushing for standby use.

[0051] Secondly, the environmentally friendly regeneration agent is prepared: Heat 100 parts of No. 200 base asphalt at 130°C to a molten state, add 10 parts of waste engine oil and 5 parts of tributyl citrate, stir evenly and heat to 170-180°C; then add 20 parts of SBS modifier and waste rubber powder rubber-plastic alloy, stir evenly mechanically, transfer to an oven at 170°C to swell for 60 minutes; then use a shearing machine to high-speed shear at 6000rpm for 90 minutes. Example

[0052] First, prepare the rubber-plastic alloy: Heat the plasticizer to the set temperature, and the roller spacing is 1mm; first put the linear SBS modifier into the roller for plasticization, and after the SBS modifier is melted into a sheet and wrapped around the roller, add the waste rubber powder (the particle size of the rubber powder is 60 mesh) according to the mass ratio of SBS modifier: waste rubber powder = 4:20, and continue plasticizing for 5 minutes until the two are evenly mixed. The plasticizing temperature is set to 150℃. After plasticizing, the rubber-plastic alloy is granulated by mechanical crushing for standby use.

[0053] Secondly, the environmentally friendly regeneration agent is prepared: Heat 100 parts of No. 200 base asphalt at 130°C to a molten state, add 10 parts of waste engine oil and 5 parts of tributyl citrate, stir evenly and heat to 170-180°C; then add 20 parts of SBS modifier and waste rubber powder rubber-plastic alloy, stir evenly mechanically, transfer to an oven at 170°C to swell for 60 minutes; then use a shearing machine to high-speed shear at 6000rpm for 90 minutes.

[0054] The present invention provides the following embodiments 7-15, for preparing a regenerated asphalt, wherein the specific process steps are as follows: Example

[0055] 100 parts of aged asphalt were heated to a molten state at 160-170° C., 30 parts of the environmentally friendly regeneration agent prepared in Example 1 and 0.3 parts of sulfur were added, and mechanical stirring was performed for 15 minutes; the mixture was transferred to an oven at 160-170° C. and kept warm for 2 hours. Example

[0056] 100 parts of aged asphalt were heated to a molten state at 160-170° C., 30 parts of the environmentally friendly regeneration agent prepared in Example 2 and 0.3 parts of sulfur were added, and mechanical stirring was performed for 15 minutes; the mixture was transferred to an oven at 160-170° C. and kept warm for 2 hours. Example

[0057] 100 parts of aged asphalt were heated to a molten state at 160-170° C., 30 parts of the environmentally friendly regeneration agent prepared in Example 3 and 0.3 parts of sulfur were added, and mechanical stirring was performed for 15 minutes; the mixture was transferred to an oven at 160-170° C. and kept warm for 2 hours.

[0058] Embodiment 10: 100 parts of aged asphalt were heated to a molten state at 160-170° C., 30 parts of the environmentally friendly regeneration agent prepared in Example 4 and 0.3 parts of sulfur were added, and mechanical stirring was performed for 15 minutes; the mixture was transferred to an oven at 160-170° C. and kept warm for 2 hours.

[0059] Embodiment 11: 100 parts of aged asphalt were heated to a molten state at 160-170° C., 30 parts of the environmentally friendly regeneration agent prepared in Example 5 and 0.3 parts of sulfur were added, and mechanical stirring was performed for 15 minutes; the mixture was transferred to an oven at 160-170° C. and kept warm for 2 hours.

[0060] Embodiment 12: 100 parts of aged asphalt were heated to a molten state at 160-170° C., 30 parts of the environmentally friendly regeneration agent prepared in Example 6 and 0.3 parts of sulfur were added, and mechanical stirring was performed for 15 minutes; the mixture was transferred to an oven at 160-170° C. and kept warm for 2 hours.

[0061] Embodiment 13: 100 parts of aged asphalt were heated to a molten state at 160-170° C., 15 parts of the environmentally friendly regeneration agent prepared in Example 6 and 0.3 parts of sulfur were added, and mechanical stirring was performed for 15 minutes; the mixture was transferred to an oven at 160-170° C. and kept warm for 2 hours.

[0062] Embodiment 14: 100 parts of aged asphalt were heated to a molten state at 160-170° C., 50 parts of the environmentally friendly regeneration agent prepared in Example 6 and 0.3 parts of sulfur were added, and mechanical stirring was performed for 15 minutes; the mixture was transferred to an oven at 160-170° C. and kept warm for 2 hours.

[0063] Embodiment 15: According to the specification ASTM D2872, the regenerated asphalt prepared in Example 10 was subjected to a rotating thin film oven test to obtain secondary aged regenerated asphalt.

[0064] The present invention also provides the following comparative examples 1-2, for preparing an environmentally friendly regeneration agent, wherein the specific process steps are as follows: Comparative Example 1: Heat 100 parts of No. 200 base asphalt at 130°C to a molten state, add 10 parts of waste engine oil and 5 parts of tributyl citrate, stir evenly and heat to 170-180°C; then add 0 parts of SBS modifier and waste rubber powder rubber-plastic alloy, stir evenly mechanically, transfer to an oven at 170°C to swell for 60 minutes; then use a shearing machine to high-speed shear at 6000rpm for 90 minutes.

[0065] Comparative Example 2: Heat 100 parts of No. 200 base asphalt at 130°C to a molten state, add 10 parts of waste engine oil and 5 parts of tributyl citrate, stir evenly and heat to 170-180°C; then add 5 parts of SBS modifier and 25 parts of waste rubber powder respectively, stir evenly mechanically, transfer to an oven at 170°C to swell for 60 minutes; then use a shearing machine to high-speed shear at 6000rpm for 90 minutes.

[0066] The present invention also provides the following comparative examples 3-6, for preparing a regenerated asphalt, wherein the specific process steps are as follows: Comparative Example 3: Heat 100 parts of aged asphalt at 160-170°C to a molten state, add 30 parts of the environmentally friendly regeneration agent prepared in Comparative Example 1 and 0.3 parts of sulfur, and stir mechanically for 15 minutes; transfer to an oven at 160-170°C and keep warm for 2 hours.

[0067] Comparative Example 4: Heat 100 parts of aged asphalt at 160-170°C to a molten state, add 30 parts of the environmentally friendly regeneration agent prepared in Comparative Example 2 and 0.3 parts of sulfur, and stir mechanically for 15 minutes; transfer to an oven at 160-170°C and keep warm for 2 hours.

[0068] Comparative Example 5: This comparative example studies the anti-aging performance of recycled asphalt, and the specific process is as follows: According to the specification ASTM D2872, the regenerated asphalt prepared in Comparative Example 3 was subjected to a rotating thin film oven test to obtain secondary aged regenerated asphalt.

[0069] Comparative Example 6: This comparative example studies the anti-aging performance of recycled asphalt, and the specific process is as follows: According to the specification ASTM D2872, the regenerated asphalt prepared in Comparative Example 4 was subjected to a rotating thin film oven test to obtain secondary aged regenerated asphalt.

[0070] Table 1 below shows the basic performance test results of different recycled asphalts.

[0071] Example Softening point (℃) 5℃ elongation (cm) Needle penetration at 25℃ (0.1mm) Example 7 63.5 20.6 50.2 Example 8 66.8 18.4 46.7 Example 9 68.9 15.2 43.6 Example 10 71.9 13.5 38.2 Embodiment 11 74.3 9.3 36.6 Example 12 70.3 14.6 41.2 Embodiment 13 68.6 11.2 42.3 Embodiment 14 75.9 20.8 31.5 Comparative Example 3 45.2 30.9 85.2 Comparative Example 4 70.2 7.6 35.2 Table 1 Test results of performance indicators of recycled asphalt It is worth noting that in the above table: The softening point refers to the temperature at which the asphalt specimen softens and sags due to heat, which reflects the viscosity, high-temperature stability and temperature sensitivity of the asphalt.

[0072] 5℃ ductility refers to the 5℃ ductility test, which is to make asphalt into a standard test piece and stretch it to the length when it breaks (in centimeters) at a specified temperature (5℃ in this case) and tensile rate. The elongation is the greater the elongation, the better the plasticity of the asphalt, that is, the stronger its ability to resist cracking under low temperature conditions.

[0073] 25℃ needle penetration refers to the depth of a standard sharp needle weighing 100 grams that sinks into a sample kept at a specific temperature (25℃ in this case) within a specified time, in units of 1 / 10 mm. The greater the needle penetration, the softer the material, that is, the smaller the consistency; conversely, the harder the material, that is, the greater the consistency.

[0074] Combined with Table 1, it can be seen that the regenerated asphalt prepared in Comparative Example 3 has excellent low-temperature performance, with an elongation of 40.9 cm, but poor high-temperature performance, with a softening point of only 45.2°C, which is mainly due to the softening effect of soft asphalt, light oil and plasticizer on aged asphalt. Comparing the performance of the regenerated asphalt prepared in Examples 7-10 with that in Comparative Example 3, it can be seen that when the environmentally friendly regeneration agent contains SBS modifier and rubber-plastic alloy of waste rubber powder, the high and low temperature comprehensive performance of the prepared regenerated asphalt is significantly better than that of the regenerated asphalt prepared in Comparative Example 3; with the increase of the content of waste rubber powder in the rubber-plastic alloy, the softening point gradually increases, the penetration gradually decreases, and the change in elongation shows a trend of first decreasing and then increasing.

[0075] Comparing the regenerated asphalts prepared in Examples 11, 10 and 12, the performance of the regenerated asphalt is related to the plasticizing temperature of the rubber-plastic alloy. As the plasticizing temperature increases, the softening point decreases slightly, the needle penetration increases slightly, and the ductility does not change significantly. This may be because during the plasticizing process, as the temperature increases, the SBS modifier and the waste rubber powder are degraded to varying degrees, which ultimately affects the modification effect on the regenerated asphalt.

[0076] By comparing the regenerated asphalts prepared in Examples 13, 10 and 14, it can be seen that with the increase in the amount of the environmentally friendly regeneration agent, the comprehensive performance of the regenerated asphalt becomes increasingly excellent.

[0077] Comparing the regenerated asphalt prepared in Example 10 and Comparative Example 4, the aged asphalt regenerated by directly adding the SBS modifier and the environmentally friendly regeneration agent prepared by waste rubber powder has a slightly higher softening point than the aged asphalt regenerated by the rubber-plastic alloy regeneration agent, but its ductility is significantly lower than the latter.

[0078] Therefore, the comprehensive performance of the regenerated asphalt prepared in Example 10 is better.

[0079] Table 2 shows the performance test results of recycled asphalt after secondary aging.

[0080] Example Softening point (℃) / Performance difference (℃) 5℃ elongation (cm) / performance retention rate (%) 25℃ Needle penetration (0.1mm) / Performance difference (0.1mm) Embodiment 15 69.8 / 2.1 11.8 / 87.5 40.6 / 2.4 Comparative Example 5 39.5 / 5.7 30.6 / 74.8 61.2 / 29.4 Comparative Example 6 72.5 / 2.3 6.2 / 81.4 37.8 / 2.6 Table 2 Test results of performance indicators of recycled asphalt after secondary aging Comparing the regenerated asphalt after aging in Example 15 and Comparative Example 5, it can be seen that when the regenerating agent contains a rubber-plastic alloy of SBS modifier and waste rubber powder, the performance change range of the regenerated asphalt after secondary aging is significantly lower than that of the aged asphalt regenerated with a regenerating agent that does not contain rubber-plastic alloy, indicating that the former has better anti-aging performance. This is due to the protective effect of the SBS modifier on the asphalt and the antioxidant in the waste rubber powder. Comparing the regenerated asphalt after aging in Example 15 and Comparative Example 6, it can be seen that the performance change range of the former is slightly lower than that of the aged asphalt regenerated with an environmentally friendly regenerating agent prepared by directly mixing SBS modifier and waste rubber powder. This may be because in the rubber-plastic alloy, the waste rubber powder is wrapped on the surface of the SBS modifier, which plays a protective role.

[0081] Figure 1 It is the segregation value of the regenerated asphalt. It can be seen that the storage stability of the regenerated asphalt prepared with the regenerator containing rubber-plastic alloy is significantly higher than that of the aged asphalt regenerated with the environmentally friendly regenerator prepared by directly adding SBS modifier and waste rubber powder, and is related to the plasticizing temperature. The higher the temperature, the better the storage stability.

[0082] Therefore, by using the environmentally friendly regeneration agent containing rubber-plastic alloy of the present invention for preparation and combining it with a suitable plasticizing temperature, regenerated asphalt with better properties can be obtained.

[0083] It is worth noting that the present invention has found through multiple experiments that: (1) When the environmentally friendly regeneration agent is prepared by using any one of the soft asphalts of No. 90, No. 100, and No. 150 to regenerate the aged asphalt, the effect is similar to that of No. 200 asphalt, and the performance change law is consistent, so the examples are not listed one by one for detailed description.

[0084] (2) When any one of waste cooking oil, bio-oil (vegetable oil), tall oil and aromatic oil or a random combination of multiple ones is used as the light oil component to prepare an environmentally friendly regeneration agent for regenerating aged asphalt, the effect is similar to that of waste engine oil, and the performance change law is consistent, so the examples are not listed one by one for detailed description.

[0085] (3) When one or more of phthalate compounds - n-butyl phthalate and dioctyl phthalate, epoxy ester compounds - epoxidized soybean oil and octyl epoxystearate, and citrate compounds - triethyl citrate are used as plasticizers to prepare an environmentally friendly regeneration agent, the effect on the regeneration of aged asphalt is similar to that of tributyl citrate, and the performance change pattern is consistent, so the examples are not listed one by one for detailed description.

[0086] (4) When the star-shaped SBS modifier and waste rubber powder are used to prepare an environmentally friendly regeneration agent for regenerating aged asphalt, the effect is similar to that of the linear SBS modifier, and the performance change law is consistent, so the examples are not listed one by one for detailed description.

[0087] (5) When the environmentally friendly regeneration agent prepared by using waste rubber powder of any one of the particle sizes of 5 mesh, 10 mesh, 20 mesh, 40 mesh or 80 mesh and SBS modifier rubber-plastic alloy is used to regenerate aged asphalt, the effect is similar to that of 60 mesh waste rubber powder, and the performance change law is consistent, so the examples will not be listed one by one. The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. An environmentally friendly regeneration agent, characterized in that: include: 100 parts of soft asphalt; 5-15 parts of component regulator; 5-10 parts of plasticizer; 10-30 parts polymer modifier.

2. The environmentally friendly regeneration agent according to claim 1, characterized in that: The soft asphalt is any one of No. 90, No. 100, No. 150 and No. 200 base asphalts.

3. The environmentally friendly regeneration agent according to claim 1, characterized in that: The component regulator is a light oil component, and the component regulator is any one or more combinations of waste oil, waste engine oil, bio-oil, tall oil and aromatic oil.

4. The environmentally friendly regeneration agent according to claim 1, characterized in that: The plasticizer is one or a combination of phthalate compounds, epoxy ester compounds and citrate compounds.

5. The environmentally friendly regeneration agent according to claim 4, characterized in that: The phthalate compound is one of n-butyl phthalate and dioctyl phthalate, the epoxy ester compound is one of epoxidized soybean oil and epoxy stearate octyl ester, and the citrate compound is one of triethyl citrate and tributyl citrate.

6. The environmentally friendly regeneration agent according to claim 1, characterized in that: The polymer modifier is a rubber-plastic alloy synthesized from an SBS modifier and waste rubber powder.

7. The environmentally friendly regeneration agent according to claim 6, characterized in that: The molecular chain of the SBS modifier is a linear structure or a star structure, and the particle size of the waste rubber powder is any one of 5 meshes, 10 meshes, 20 meshes, 40 meshes, 60 meshes and 80 meshes.

8. A method for preparing an environmentally friendly regeneration agent as claimed in any one of claims 1 to 7, characterized in that: Includes steps: S1: 100 parts of soft asphalt are heated at 130°C to a molten state; S2: Add 5-15 parts of component regulator and 5-10 parts of plasticizer, stir evenly and heat to 170-180°C; S3: Add 10-30 parts of polymer modifier and stir evenly; S4: The mixture stirred evenly in step S3 above was transferred to an oven at 170° C. for swelling for 60 minutes.

9. A regenerated asphalt, characterized in that: The invention comprises 15-50 parts of the environmentally friendly regeneration agent as claimed in any one of claims 1-7, and further comprises: 100 parts aged asphalt; 0.1-0.5 parts of stabilizer.

10. The regenerated asphalt according to claim 9, characterized in that: The stabilizer is any one of sulfur and dicumyl peroxide.

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