An environmentally friendly regenerant, its preparation method and regenerated asphalt

Abstract

The present invention discloses an environmentally friendly regenerant, its preparation method and regenerated asphalt, including: 100 parts of soft asphalt; 5 - 15 parts of component regulators; 5 - 10 parts of plasticizers; 10 - 30 parts of polymer modifiers. By adjusting the component formula of the environmentally friendly regenerant and matching with the corresponding preparation method, the regeneration effect of the environmentally friendly regenerant is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of environmental protection materials, and particularly relates to an environmental protection regenerant, a preparation method thereof, and regenerated asphalt. Background Art

[0002] A large amount of raw materials are consumed during the construction, maintenance, and repair of roads. The recycling of old asphalt pavement materials has great economic and environmental benefits. The aging and denaturation of asphalt limit the dosage of waste asphalt mixtures and reduce the road performance of recycled asphalt mixtures. Therefore, the high-quality regeneration of aged asphalt is of great significance for the green circular application of pavement materials. The regeneration effect of aged asphalt is directly related to the regenerant. Although there are already many mature regenerant products on the market, their quality and cost performance vary, making it difficult to achieve the ideal regeneration effect. It is crucial to carry out reasonable component design and improvement of the regenerant.

[0003] The research and development of regenerants should be based on the asphalt coupling aging mechanism, starting from restoring pavement diseases, supported by avoiding similar diseases, and aiming to extend the service life of asphalt pavements. Based on this, some scholars have proposed the concept of "modified regeneration", that is, defining "regeneration" as the restoration of performance and "modification" as the improvement of performance. Summary of the Invention

[0004] The purpose of the present invention is to provide an environmental protection regenerant, a preparation method thereof, and regenerated asphalt. By adjusting the component formula of the environmental protection regenerant and matching it with the corresponding preparation method, the regeneration effect of the environmental protection regenerant is greatly improved.

[0005] An environmental protection regenerant provided by the present invention includes:

[0006] 100 parts of soft asphalt;

[0007] 5 - 15 parts of component regulator;

[0008] 5 - 10 parts of plasticizer;

[0009] 10 - 30 parts of polymer modifier.

[0010] Further, the soft asphalt is any one of 90#, 100#, 150#, and 200# base asphalt.

[0011] Further, the component regulator is light oil fraction, and the component regulator is any one or a combination of waste cooking oil, waste engine oil, bio-oil, tall oil, and aromatic oil.

[0012] Further, the plasticizer is a combination of one or several of phthalate compounds, epoxy ester compounds, and citrate compounds.

[0013] 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.

[0014] Furthermore, the polymer modifier is a rubber-plastic alloy synthesized from an SBS modifier and waste rubber powder.

[0015] 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.

[0016] 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.

[0017] 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.

[0018] 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.

[0019] The present invention also provides a method for preparing the environmentally friendly regeneration agent as described above, comprising the steps of:

[0020] S1: 100 parts of soft asphalt are heated at 130°C to a molten state;

[0021] S2: Add 5-15 parts of component regulator and 5-10 parts of plasticizer, stir evenly and heat to 170-180°C;

[0022] S3: Add 10-30 parts of polymer modifier and stir evenly;

[0023] S4: The mixture stirred evenly in step S3 above was transferred to an oven at 170° C. for swelling for 60 minutes.

[0024] The present invention also provides a regenerated asphalt, comprising 15-50 parts of the above-mentioned environmentally friendly regeneration agent, and further comprising:

[0025] 100 parts aged asphalt;

[0026] 0.1-0.5 parts of stabilizer.

[0027] Furthermore, the stabilizer is any one of sulfur and dicumyl peroxide.

[0028] 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.

[0029] 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

[0030] Figure 1 It is the segregation value of the regenerated asphalt described in some embodiments. DETAILED DESCRIPTION

[0031] 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.

[0032] An environmentally friendly regeneration agent provided by the present invention comprises:

[0033] 100 parts of soft asphalt;

[0034] 5-15 parts of component regulator;

[0035] 5-10 parts of plasticizer;

[0036] 10-30 parts polymer modifier.

[0037] The soft asphalt is any one of the base asphalts of No. 90, No. 100, No. 150 and No. 200.

[0038] 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.

[0039] The plasticizer is one or a combination of phthalate compounds, epoxy ester compounds and citrate compounds.

[0040] 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.

[0041] The polymer modifier is a rubber-plastic alloy synthesized from SBS modifier and waste rubber powder.

[0042] 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.

[0043] It is worth noting that the waste rubber powder described in the present invention mainly comes from waste tires.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] It is worth noting that the mass ratio of the above-mentioned SBS modifier to the waste rubber powder is 0.2-0.8.

[0048] The present invention also provides a synthesis process for SBS modifier and waste rubber powder, comprising the following steps:

[0049] S1: Provide a plasticator, heat the plasticator to a set temperature, and set the roller spacing to 1 mm;

[0050] S2: Feed the SBS modifier (either linear structure or star structure) into the roller for plasticization;

[0051] S3: After the SBS modifier is melted into flakes and wraps around the roller, feed in the waste rubber powder and continue plasticizing for 5 min until the two are evenly mixed, and set the plasticization temperature between 100 - 150 °C.

[0052] S4: After the plasticization is completed, granulate it by mechanical crushing for standby.

[0053] The present invention also provides a preparation method for an environmental protection regenerant as above, comprising the steps:

[0054] S1: Heat 100 parts of soft asphalt to a molten state at 130 °C;

[0055] S2: Add 5 - 15 parts of component regulator and 5 - 10 parts of plasticizer, stir evenly and heat up to 170 - 180 °C;

[0056] S3: Add 10 - 30 parts of polymer modifier and stir evenly;

[0057] S4: Transfer the mixture after being stirred evenly in step S3 above to an oven at 170 °C for swelling for 60 minutes.

[0058] The present invention also provides a regenerated asphalt, comprising 15 - 50 parts of the environmental protection regenerant as above, and further comprising:

[0059] 100 parts of aged asphalt;

[0060] 0.1 - 0.5 part of stabilizer.

[0061] The stabilizer is any one of sulfur and dicumyl peroxide.

[0062] By adding an environmental protection regenerant to the aged asphalt, with the light oil components of soft asphalt and component regulator as the main components, it can be used to supplement and adjust the component ratio of the aged asphalt in the regeneration process of the aged asphalt. At the same time, by adding a plasticizer, the plastic deformation ability and permeability of the aged asphalt can be improved; using SBS modifier and waste rubber powder as modifiers can simultaneously improve the high and low temperature performance and anti - aging performance of the regenerated asphalt. The present invention relates to the circular recycling of waste materials such as aged asphalt, gutter oil, waste engine oil, and waste rubber powder, reducing the pollution to the ecological environment.

[0063] 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.

[0064] 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

[0065] First, prepare the rubber-plastic alloy:

[0066] 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.

[0067] Secondly, the environmentally friendly regeneration agent is prepared:

[0068] 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

[0069] First, prepare the rubber-plastic alloy:

[0070] 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.

[0071] Secondly, the environmentally friendly regeneration agent is prepared:

[0072] 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

[0073] First, prepare the rubber-plastic alloy:

[0074] 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.

[0075] Secondly, the environmentally friendly regeneration agent is prepared:

[0076] 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

[0077] First, prepare the rubber-plastic alloy:

[0078] 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.

[0079] Secondly, the environmentally friendly regeneration agent is prepared:

[0080] 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

[0081] First, prepare the rubber-plastic alloy:

[0082] Heat the plasticator to the set temperature with a roller spacing of 1 mm. First, put the linear-structured SBS modifier into the roller for plasticization. After the SBS modifier melts into a sheet and wraps around the roller, according to the mass ratio of SBS modifier: waste rubber powder = 4:20, then put in the waste rubber powder (the particle size of the rubber powder is 60 mesh), and continue plasticizing for 5 min until the two are evenly mixed. The plasticizing temperature is set at 100 °C. After the plasticization is completed, granulate the rubber-plastic alloy by mechanical crushing for standby.

[0083] Secondly, prepare the environmentally friendly regenerant:

[0084] Heat 100 parts of No. 200 base asphalt to the molten state at 130 °C, add 10 parts of waste engine oil and 5 parts of tributyl citrate, stir evenly and heat up to 170 - 180 °C; then add 20 parts of SBS modifier and the rubber-plastic alloy of waste rubber powder, after mechanical stirring evenly, transfer it to an oven at 170 °C for swelling for 60 min; then use a shear machine to shear at 6000 rpm for 90 min. Example

[0085] First, prepare the rubber-plastic alloy:

[0086] Heat the plasticator to the set temperature with a roller spacing of 1 mm. First, put the linear-structured SBS modifier into the roller for plasticization. After the SBS modifier melts into a sheet and wraps around the roller, according to the mass ratio of SBS modifier: waste rubber powder = 4:20, then put in the waste rubber powder (the particle size of the rubber powder is 60 mesh), and continue plasticizing for 5 min until the two are evenly mixed. The plasticizing temperature is set at 150 °C. After the plasticization is completed, granulate the rubber-plastic alloy by mechanical crushing for standby.

[0087] Secondly, prepare the environmentally friendly regenerant:

[0088] Heat 100 parts of No. 200 base asphalt to the molten state at 130 °C, add 10 parts of waste engine oil and 5 parts of tributyl citrate, stir evenly and heat up to 170 - 180 °C; then add 20 parts of SBS modifier and the rubber-plastic alloy of waste rubber powder, after mechanical stirring evenly, transfer it to an oven at 170 °C for swelling for 60 min; then use a shear machine to shear at 6000 rpm for 90 min.

[0089] The present invention provides the following Examples 7 - 15 for preparing a regenerated asphalt, and the specific process steps are as follows: Example

[0090] Heat 100 parts of aged asphalt to a molten state at 160 - 170 °C, add 30 parts of the environmentally friendly regenerant prepared in Example 1 and 0.3 parts of sulfur, and mechanically stir for 15 min; transfer it to an oven at 160 - 170 °C and keep it warm for 2 h. Example

[0091] Heat 100 parts of aged asphalt to a molten state at 160 - 170 °C, add 30 parts of the environmentally friendly regenerant prepared in Example 2 and 0.3 parts of sulfur, and mechanically stir for 15 min; transfer it to an oven at 160 - 170 °C and keep it warm for 2 h. Example

[0092] Heat 100 parts of aged asphalt to a molten state at 160 - 170 °C, add 30 parts of the environmentally friendly regenerant prepared in Example 3 and 0.3 parts of sulfur, and mechanically stir for 15 min; transfer it to an oven at 160 - 170 °C and keep it warm for 2 h.

[0093] Example 10:

[0094] Heat 100 parts of aged asphalt to a molten state at 160 - 170 °C, add 30 parts of the environmentally friendly regenerant prepared in Example 4 and 0.3 parts of sulfur, and mechanically stir for 15 min; transfer it to an oven at 160 - 170 °C and keep it warm for 2 h.

[0095] Example 11:

[0096] Heat 100 parts of aged asphalt to a molten state at 160 - 170 °C, add 30 parts of the environmentally friendly regenerant prepared in Example 5 and 0.3 parts of sulfur, and mechanically stir for 15 min; transfer it to an oven at 160 - 170 °C and keep it warm for 2 h.

[0097] Example 12:

[0098] Heat 100 parts of aged asphalt to a molten state at 160 - 170 °C, add 30 parts of the environmentally friendly regenerant prepared in Example 6 and 0.3 parts of sulfur, and mechanically stir for 15 min; transfer it to an oven at 160 - 170 °C and keep it warm for 2 h.

[0099] Example 13:

[0100] Heat 100 parts of aged asphalt to a molten state at 160 - 170 °C, add 15 parts of the environmentally friendly regenerant prepared in Example 6 and 0.3 parts of sulfur, and mechanically stir for 15 min; transfer it to an oven at 160 - 170 °C and keep it warm for 2 h.

[0101] Example 14:

[0102] Heat 100 parts of aged asphalt to the molten state at 160 - 170 °C, add 50 parts of the environment-friendly regenerant prepared in Example 6 and 0.3 part of sulfur, and mechanically stir for 15 min; transfer it to an oven at 160 - 170 °C and keep it warm for 2 h.

[0103] Example 15:

[0104] According to the specification ASTM D2872, conduct a rolling thin film oven test on the regenerated asphalt prepared in Example 10 to obtain the regenerated asphalt after secondary aging.

[0105] The present invention also provides the following Comparative Examples 1 - 2 for preparing an environment-friendly regenerant. The specific process steps are as follows:

[0106] Comparative Example 1:

[0107] Heat 100 parts of No. 200 base asphalt to the molten state at 130 °C, add 10 parts of waste engine oil and 5 parts of tributyl citrate, stir evenly and heat up to 170 - 180 °C; then add 0 part of SBS modifier and waste rubber powder-rubber alloy, mechanically stir evenly, transfer it to an oven at 170 °C and swell for 60 min; subsequently, use a shearing machine to shear at 6000 rpm for 90 min.

[0108] Comparative Example 2:

[0109] Heat 100 parts of No. 200 base asphalt to the molten state at 130 °C, add 10 parts of waste engine oil and 5 parts of tributyl citrate, stir evenly and heat up to 170 - 180 °C; then add 5 parts of SBS modifier and 25 parts of waste rubber powder respectively, mechanically stir evenly, transfer it to an oven at 170 °C and swell for 60 min; subsequently, use a shearing machine to shear at 6000 rpm for 90 min.

[0110] The present invention also provides the following Comparative Examples 3 - 6 for preparing a regenerated asphalt. The specific process steps are as follows:

[0111] Comparative Example 3:

[0112] Heat 100 parts of aged asphalt to the molten state at 160 - 170 °C, add 30 parts of the environment-friendly regenerant prepared in Comparative Example 1 and 0.3 part of sulfur, mechanically stir for 15 min; transfer it to an oven at 160 - 170 °C and keep it warm for 2 h.

[0113] Comparative Example 4:

[0114] Heat 100 parts of aged asphalt to the molten state at 160 - 170 °C, add 30 parts of the environment-friendly regenerant prepared in Comparative Example 2 and 0.3 part of sulfur, mechanically stir for 15 min; transfer it to an oven at 160 - 170 °C and keep it warm for 2 h.

[0115] Comparative Example 5:

[0116] This comparative example studies the anti-aging performance of recycled asphalt, and the specific process is as follows:

[0117] According to the specification ASTM D2872, the recycled asphalt prepared in Comparative Example 3 was subjected to a rolling thin film oven test to obtain the recycled asphalt after secondary aging.

[0118] Comparative Example 6:

[0119] This comparative example studies the anti-aging performance of recycled asphalt, and the specific process is as follows:

[0120] According to the specification ASTM D2872, the recycled asphalt prepared in Comparative Example 4 was subjected to a rolling thin film oven test to obtain the recycled asphalt after secondary aging.

[0121] The following Table 1 shows the test results of the basic properties of different recycled asphalts.

[0122] Example Softening point (°C) Ductility at 5°C (cm) Penetration at 25°C (0.1 mm) 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 Example 11 74.3 9.3 36.6 Example 12 70.3 14.6 41.2 Example 13 68.6 11.2 42.3 Example 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

[0123] Table 1 Test Results of Performance Indexes of Recycled Asphalt

[0124] It should be noted that in the above table:

[0125] The softening point refers to the temperature at which the asphalt specimen softens and sags, reflecting the viscosity, high-temperature stability and temperature sensitivity of the asphalt.

[0126] The ductility at 5℃ refers to the ductility test at 5℃. The asphalt is made into a standard specimen, and at a specified temperature (5℃ in this example) and tensile rate, the length (in centimeters) when it is stretched to break is the ductility. The greater the ductility, the better the plasticity of the asphalt, that is, the stronger the ability to resist cracking under low-temperature conditions.

[0127] The penetration at 25℃ refers to the depth that a standard pointed needle with a load of 100 grams sinks into the specimen kept at a specific temperature (25℃ in this example) within a specified time, in units of 1 / 10 mm. The greater the penetration, the softer the material, that is, the smaller the consistency; conversely, it means the harder the material, that is, the greater the consistency.

[0128] Combined with Table 1, it can be seen that the recycled asphalt prepared in Comparative Example 3 has excellent low-temperature performance, with a ductility reaching 40.9 cm. However, its high-temperature performance is too poor, and the softening point is only 45.2 °C. This is mainly because the soft asphalt, light oil fraction, and plasticizer soften the aged asphalt. Comparing the properties of the recycled asphalt prepared in Examples 7 - 10 with that in Comparative Example 3, it can be seen that when the environmentally friendly regenerant contains a rubber-plastic alloy of SBS modifier and waste rubber powder, the comprehensive high- and low-temperature performance of the prepared recycled asphalt is significantly better than that of the recycled asphalt prepared in Comparative Example 3; as the content of waste rubber powder in the rubber-plastic alloy increases, the softening point gradually rises, the penetration gradually decreases, and the change in ductility shows a trend of first decreasing and then increasing.

[0129] Comparing the recycled asphalt prepared in Examples 11, 10, and 12, the properties of the recycled asphalt are related to the plasticizing temperature of the rubber-plastic alloy. As the plasticizing temperature increases, the softening point decreases slightly, the penetration increases slightly, and the change in ductility is not obvious. This may be because during the plasticizing process, as the temperature rises, the SBS modifier and waste rubber powder degrade to varying degrees, ultimately affecting the modification effect on the recycled asphalt.

[0130] Comparing the recycled asphalt prepared in Examples 13, 10, and 14, it can be seen that as the dosage of the environmentally friendly regenerant increases, the comprehensive performance of the recycled asphalt becomes more and more excellent.

[0131] Comparing the recycled asphalt prepared in Example 10 and Comparative Example 4, the aged asphalt regenerated with an environmentally friendly regenerant prepared by directly adding an SBS modifier and waste rubber powder has a slightly higher softening point than the aged asphalt regenerated with a rubber-plastic alloy regenerant, but its ductility is significantly lower than the latter.

[0132] Therefore, the recycled asphalt prepared in Example 10 has more excellent comprehensive performance.

[0133] Table 2 shows the performance test results of the recycled asphalt after secondary aging.

[0134] Example Softening point (°C) / Performance difference (°C) Ductility at 5°C (cm) / Performance retention rate (%) Penetration at 25°C (0.1 mm) / Performance difference (0.1 mm) Example 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

[0135] Table 2 Test Results of Performance Indexes of Recycled Asphalt after Secondary Aging

[0136] 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.

[0137] 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.

[0138] 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.

[0139] It is worth noting that the present invention has found through multiple experiments that:

[0140] (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.

[0141] (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.

[0142] (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.

[0143] (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.

[0144] (5) When using an environmentally friendly regenerant prepared from waste rubber powder with any one of the particle sizes of 5 mesh, 10 mesh, 20 mesh, 40 mesh or 80 mesh and an SBS modifier rubber-plastic alloy to regenerate the aged asphalt, the effect is similar to that of 60-mesh waste rubber powder, and the performance change law is the same. Therefore, the examples will not be listed one by one for elaboration.

[0145] The above are only the preferred embodiments of the present application. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present application, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present application.

Claims

1. An environmentally friendly regenerant, characterized in that, include: 100 parts of soft asphalt; 5-15 parts of component regulator; 5-10 parts of plasticizer; 10-30 parts of polymer modifier; The soft asphalt is any one of No. 90, No. 100, No. 150 and No. 200 base asphalt; 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; The plasticizer is one or a combination of phthalate compounds, epoxy ester compounds and citrate compounds; The phthalate compound is one of n-butyl phthalate and dioctyl phthalate, the epoxy ester compound is one of epoxidized soybean oil and octyl epoxy stearate, and the citrate compound is one of triethyl citrate and tributyl citrate; The preparation method of the environmentally friendly regeneration agent comprises 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: transferring the mixture stirred evenly in step S3 to an oven at 170° C. to swell for 60 minutes; The polymer modifier is a rubber-plastic alloy synthesized from SBS modifier and waste rubber powder; The preparation method of the rubber-plastic alloy synthesized from the SBS modifier and the waste rubber powder comprises: S1: Provide a plasticizer and heat the plasticizer to the set temperature with a roller spacing of 1mm; S2: Put the SBS modifier into the drum for plastication; S3: After the SBS modifier is melted into a sheet and rolled, waste rubber powder is added and plasticized for 5 minutes until the two are evenly mixed. The plasticization temperature is set between 100-150℃; S4: After the plasticating is completed, the pellets are granulated by mechanical crushing for later use.

2. The environmentally friendly regenerant according to claim 1, 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.

3. A recycled asphalt, characterized in that, The invention comprises 15-50 parts of the environmentally friendly regeneration agent as claimed in any one of claims 1-2, and further comprises: 100 parts aged asphalt; 0.1-0.5 parts of stabilizer; The stabilizer is any one of sulfur and dicumyl peroxide.

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